/**
 * XarenChat Modern Design System & Stylesheet
 * Responsive, Dark-first, accessible, and polished.
 */

/* ==========================================================================
   CSS CUSTOM PROPERTIES (THEME TOKENS)
   ========================================================================== */

:root,
[data-theme="aurora"],
[data-theme="dark"] {
  /* Theme 1: Aurora (User Pick / Default) */
  --bg-primary: #0b0d17;
  --bg-secondary: #141829;
  --bg-tertiary: #1b2038;
  --bg-card: #151a2e;
  --bg-input: #101424;
  --bg-code-header: #1a213a;
  --bg-code-block: #0d101d;
  --bg-hover: rgba(139, 92, 246, 0.08);
  --bg-active: rgba(139, 92, 246, 0.16);

  --border-subtle: #222b48;
  --border-strong: #33406a;
  --border-focus: #8b5cf6;

  --text-primary: #e8eaf6;
  --text-secondary: #9ea9cf;
  --text-muted: #67749f;
  --text-inverse: #0b0d17;

  --accent: #8b5cf6;
  --accent-light: #a78bfa;
  --accent-dark: #7c3aed;
  --accent-glow: rgba(139, 92, 246, 0.35);
  --accent-gradient: linear-gradient(135deg, #8b5cf6 0%, #22d3ee 100%);
  --accent-gradient-hover: linear-gradient(135deg, #7c3aed 0%, #06b6d4 100%);

  --danger: #ef4444;
  --danger-hover: #dc2626;
  --success: #10b981;

  --user-bubble-bg: #1a2238;
  --user-bubble-border: #2e3b60;
  --ai-bubble-bg: transparent;

  /* Flowchart Canvas Tokens */
  --diagram-grid-dot: rgba(139, 92, 246, 0.15);
  --diagram-grid-bg: #090b14;


  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;

  /* Sizing & Radii */
  --sidebar-width: 280px;
  --content-max-width: 820px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.35);
  --shadow-md: 0 4px 12px 0 rgba(0, 0, 0, 0.45);
  --shadow-lg: 0 10px 25px -3px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 20px rgba(139, 92, 246, 0.3);

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
}

/* Theme 2: Supernova */
[data-theme="supernova"] {
  --bg-primary: #0f0a0a;
  --bg-secondary: #1a1212;
  --bg-tertiary: #261a1a;
  --bg-card: #1f1414;
  --bg-input: #150d0d;
  --bg-code-header: #261818;
  --bg-code-block: #120b0b;
  --bg-hover: rgba(255, 107, 53, 0.08);
  --bg-active: rgba(247, 37, 133, 0.16);

  --border-subtle: #332020;
  --border-strong: #4d2e2e;
  --border-focus: #ff6b35;

  --text-primary: #fff1ec;
  --text-secondary: #d9aba1;
  --text-muted: #9e756c;
  --text-inverse: #0f0a0a;

  --accent: #ff6b35;
  --accent-light: #ff8859;
  --accent-dark: #e85822;
  --accent-glow: rgba(255, 107, 53, 0.35);
  --accent-gradient: linear-gradient(135deg, #ff6b35 0%, #f72585 100%);
  --accent-gradient-hover: linear-gradient(135deg, #f05a24 0%, #d8146e 100%);

  --danger: #ff4d4d;
  --danger-hover: #e63939;
  --success: #10b981;

  --user-bubble-bg: #241616;
  --user-bubble-border: #422828;
  --ai-bubble-bg: transparent;

  /* Flowchart Canvas Tokens */
  --diagram-grid-dot: rgba(255, 107, 53, 0.15);
  --diagram-grid-bg: #0b0707;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 12px 0 rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 10px 25px -3px rgba(0, 0, 0, 0.65);
  --shadow-glow: 0 0 22px rgba(255, 107, 53, 0.35);
}

/* Theme 3: Matrix Terminal */
[data-theme="matrix"] {
  --bg-primary: #050805;
  --bg-secondary: #0c120c;
  --bg-tertiary: #131c13;
  --bg-card: #0f170f;
  --bg-input: #080c08;
  --bg-code-header: #142014;
  --bg-code-block: #060a06;
  --bg-hover: rgba(0, 255, 136, 0.08);
  --bg-active: rgba(0, 255, 136, 0.16);

  --border-subtle: #182b18;
  --border-strong: #254425;
  --border-focus: #00ff88;

  --text-primary: #d4f8de;
  --text-secondary: #7ec590;
  --text-muted: #4e825c;
  --text-inverse: #050805;

  --accent: #00ff88;
  --accent-light: #33ffa0;
  --accent-dark: #00cc6c;
  --accent-glow: rgba(0, 255, 136, 0.35);
  --accent-gradient: linear-gradient(135deg, #00ff88 0%, #00bb66 100%);
  --accent-gradient-hover: linear-gradient(135deg, #33ffa0 0%, #00a359 100%);

  --danger: #ff5555;
  --danger-hover: #e04444;
  --success: #00ff88;

  --user-bubble-bg: #0e190e;
  --user-bubble-border: #1c351c;
  --ai-bubble-bg: transparent;

  /* Flowchart Canvas Tokens */
  --diagram-grid-dot: rgba(0, 255, 136, 0.14);
  --diagram-grid-bg: #030603;

  /* Monospace JetBrains Mono for full terminal aesthetic */
  --font-sans: 'JetBrains Mono', 'Fira Code', monospace;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.5);
  --shadow-md: 0 4px 12px 0 rgba(0, 0, 0, 0.6);
  --shadow-lg: 0 10px 25px -3px rgba(0, 0, 0, 0.7);
  --shadow-glow: 0 0 22px rgba(0, 255, 136, 0.35);
}

/* Theme 4: Clean Paper (Light) */
[data-theme="paper"],
[data-theme="light"] {
  --bg-primary: #f7f7f5;
  --bg-secondary: #ffffff;
  --bg-tertiary: #eeeee9;
  --bg-card: #ffffff;
  --bg-input: #ffffff;
  --bg-code-header: #e6e6e0;
  --bg-code-block: #f2f2ed;
  --bg-hover: rgba(37, 99, 235, 0.05);
  --bg-active: rgba(37, 99, 235, 0.1);

  --border-subtle: #e5e5de;
  --border-strong: #d0d0c6;
  --border-focus: #2563eb;

  --text-primary: #1f2937;
  --text-secondary: #4b5563;
  --text-muted: #9ca3af;
  --text-inverse: #ffffff;

  --accent: #2563eb;
  --accent-light: #3b82f6;
  --accent-dark: #1d4ed8;
  --accent-glow: rgba(37, 99, 235, 0.2);
  --accent-gradient: linear-gradient(135deg, #2563eb 0%, #0284c7 100%);
  --accent-gradient-hover: linear-gradient(135deg, #1d4ed8 0%, #0369a1 100%);

  --danger: #ef4444;
  --danger-hover: #dc2626;
  --success: #10b981;

  --user-bubble-bg: #eef4ff;
  --user-bubble-border: #bfdbfe;
  --ai-bubble-bg: transparent;

  /* Flowchart Canvas Tokens */
  --diagram-grid-dot: rgba(37, 99, 235, 0.1);
  --diagram-grid-bg: #fdfdfc;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.07);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.09);
  --shadow-glow: 0 0 18px rgba(37, 99, 235, 0.2);
}

/* Theme 5: Tangier Sunset */
[data-theme="tangier"] {
  --bg-primary: #0a1628;
  --bg-secondary: #122340;
  --bg-tertiary: #193158;
  --bg-card: #142747;
  --bg-input: #0e1c33;
  --bg-code-header: #193056;
  --bg-code-block: #0b182d;
  --bg-hover: rgba(244, 185, 66, 0.08);
  --bg-active: rgba(244, 185, 66, 0.16);

  --border-subtle: #1e3863;
  --border-strong: #2c4f88;
  --border-focus: #f4b942;

  --text-primary: #f5ecd7;
  --text-secondary: #c2b59b;
  --text-muted: #8c826c;
  --text-inverse: #0a1628;

  --accent: #f4b942;
  --accent-light: #f7c96a;
  --accent-dark: #dc9f27;
  --accent-glow: rgba(244, 185, 66, 0.35);
  --accent-gradient: linear-gradient(135deg, #f4b942 0%, #e07a5f 100%);
  --accent-gradient-hover: linear-gradient(135deg, #e3a52c 0%, #ca674c 100%);

  --danger: #ef4444;
  --danger-hover: #dc2626;
  --success: #10b981;

  --user-bubble-bg: #15294a;
  --user-bubble-border: #264679;
  --ai-bubble-bg: transparent;

  /* Flowchart Canvas Tokens */
  --diagram-grid-dot: rgba(244, 185, 66, 0.14);
  --diagram-grid-bg: #071120;


  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.35);
  --shadow-md: 0 4px 12px 0 rgba(0, 0, 0, 0.45);
  --shadow-lg: 0 10px 25px -3px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 20px rgba(244, 185, 66, 0.35);
}

/* Theme 6: Cyberpunk Neon */
[data-theme="cyberpunk"] {
  --bg-primary: #070710;
  --bg-secondary: #0f0f1f;
  --bg-tertiary: #191932;
  --bg-card: #141428;
  --bg-input: #0b0b18;
  --bg-code-header: #181830;
  --bg-code-block: #090914;
  --bg-hover: rgba(255, 0, 127, 0.08);
  --bg-active: rgba(255, 0, 127, 0.16);

  --border-subtle: #242446;
  --border-strong: #383868;
  --border-focus: #ff007f;

  --text-primary: #f0f4ff;
  --text-secondary: #a5b4d4;
  --text-muted: #6b7a9f;
  --text-inverse: #070710;

  --accent: #ff007f;
  --accent-light: #ff3399;
  --accent-dark: #d6006b;
  --accent-glow: rgba(255, 0, 127, 0.4);
  --accent-gradient: linear-gradient(135deg, #ff007f 0%, #00f0ff 100%);
  --accent-gradient-hover: linear-gradient(135deg, #e60072 0%, #00d4e0 100%);

  --danger: #ff3366;
  --danger-hover: #e6194c;
  --success: #00ffaa;

  --user-bubble-bg: #1a1228;
  --user-bubble-border: #3b1d4a;
  --ai-bubble-bg: transparent;

  --diagram-grid-dot: rgba(255, 0, 127, 0.15);
  --diagram-grid-bg: #05050c;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.5);
  --shadow-md: 0 4px 12px 0 rgba(0, 0, 0, 0.65);
  --shadow-lg: 0 10px 25px -3px rgba(0, 0, 0, 0.8);
  --shadow-glow: 0 0 24px rgba(255, 0, 127, 0.4);
}

/* Theme 7: Emerald Forest */
[data-theme="emerald"] {
  --bg-primary: #051311;
  --bg-secondary: #0a201c;
  --bg-tertiary: #10302b;
  --bg-card: #0d2722;
  --bg-input: #081a17;
  --bg-code-header: #11332c;
  --bg-code-block: #061614;
  --bg-hover: rgba(16, 185, 129, 0.08);
  --bg-active: rgba(16, 185, 129, 0.16);

  --border-subtle: #19433c;
  --border-strong: #256056;
  --border-focus: #10b981;

  --text-primary: #e6f7f3;
  --text-secondary: #a3d4ca;
  --text-muted: #679f94;
  --text-inverse: #051311;

  --accent: #10b981;
  --accent-light: #34d399;
  --accent-dark: #059669;
  --accent-glow: rgba(16, 185, 129, 0.35);
  --accent-gradient: linear-gradient(135deg, #10b981 0%, #06b6d4 100%);
  --accent-gradient-hover: linear-gradient(135deg, #059669 0%, #0891b2 100%);

  --danger: #ef4444;
  --danger-hover: #dc2626;
  --success: #10b981;

  --user-bubble-bg: #0e2b26;
  --user-bubble-border: #1c5249;
  --ai-bubble-bg: transparent;

  --diagram-grid-dot: rgba(16, 185, 129, 0.15);
  --diagram-grid-bg: #030e0c;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.45);
  --shadow-md: 0 4px 12px 0 rgba(0, 0, 0, 0.6);
  --shadow-lg: 0 10px 25px -3px rgba(0, 0, 0, 0.75);
  --shadow-glow: 0 0 22px rgba(16, 185, 129, 0.35);
}

/* Theme 8: Royal Amethyst */
[data-theme="amethyst"] {
  --bg-primary: #0d0a1a;
  --bg-secondary: #17122b;
  --bg-tertiary: #231b40;
  --bg-card: #1b1533;
  --bg-input: #120e24;
  --bg-code-header: #21193d;
  --bg-code-block: #0b0817;
  --bg-hover: rgba(168, 85, 247, 0.08);
  --bg-active: rgba(168, 85, 247, 0.16);

  --border-subtle: #2e2354;
  --border-strong: #45347a;
  --border-focus: #a855f7;

  --text-primary: #f5f0ff;
  --text-secondary: #c9bde6;
  --text-muted: #8c7db3;
  --text-inverse: #0d0a1a;

  --accent: #a855f7;
  --accent-light: #c084fc;
  --accent-dark: #9333ea;
  --accent-glow: rgba(168, 85, 247, 0.35);
  --accent-gradient: linear-gradient(135deg, #a855f7 0%, #ec4899 100%);
  --accent-gradient-hover: linear-gradient(135deg, #9333ea 0%, #db2777 100%);

  --danger: #ef4444;
  --danger-hover: #dc2626;
  --success: #10b981;

  --user-bubble-bg: #20173d;
  --user-bubble-border: #3d2b70;
  --ai-bubble-bg: transparent;

  --diagram-grid-dot: rgba(168, 85, 247, 0.15);
  --diagram-grid-bg: #090713;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.45);
  --shadow-md: 0 4px 12px 0 rgba(0, 0, 0, 0.6);
  --shadow-lg: 0 10px 25px -3px rgba(0, 0, 0, 0.75);
  --shadow-glow: 0 0 22px rgba(168, 85, 247, 0.35);
}

/* Theme 9: Solar Flare */
[data-theme="solar"] {
  --bg-primary: #120e0a;
  --bg-secondary: #1d1611;
  --bg-tertiary: #2a2019;
  --bg-card: #221a14;
  --bg-input: #17110c;
  --bg-code-header: #281e17;
  --bg-code-block: #0e0a07;
  --bg-hover: rgba(245, 158, 11, 0.08);
  --bg-active: rgba(245, 158, 11, 0.16);

  --border-subtle: #3a2b20;
  --border-strong: #543f30;
  --border-focus: #f59e0b;

  --text-primary: #fff8ed;
  --text-secondary: #d9c5b2;
  --text-muted: #9c8774;
  --text-inverse: #120e0a;

  --accent: #f59e0b;
  --accent-light: #fbbf24;
  --accent-dark: #d97706;
  --accent-glow: rgba(245, 158, 11, 0.35);
  --accent-gradient: linear-gradient(135deg, #f59e0b 0%, #ef4444 100%);
  --accent-gradient-hover: linear-gradient(135deg, #d97706 0%, #dc2626 100%);

  --danger: #ef4444;
  --danger-hover: #dc2626;
  --success: #10b981;

  --user-bubble-bg: #281d16;
  --user-bubble-border: #4d3627;
  --ai-bubble-bg: transparent;

  --diagram-grid-dot: rgba(245, 158, 11, 0.15);
  --diagram-grid-bg: #0b0806;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.45);
  --shadow-md: 0 4px 12px 0 rgba(0, 0, 0, 0.6);
  --shadow-lg: 0 10px 25px -3px rgba(0, 0, 0, 0.75);
  --shadow-glow: 0 0 22px rgba(245, 158, 11, 0.35);
}

/* Theme 10: OLED Pure Black */
[data-theme="oled"] {
  --bg-primary: #000000;
  --bg-secondary: #0a0a0c;
  --bg-tertiary: #141418;
  --bg-card: #0d0d10;
  --bg-input: #050507;
  --bg-code-header: #121216;
  --bg-code-block: #000000;
  --bg-hover: rgba(56, 189, 248, 0.08);
  --bg-active: rgba(56, 189, 248, 0.16);

  --border-subtle: #1c1c24;
  --border-strong: #2c2c38;
  --border-focus: #38bdf8;

  --text-primary: #ffffff;
  --text-secondary: #b0b4c0;
  --text-muted: #6e7282;
  --text-inverse: #000000;

  --accent: #38bdf8;
  --accent-light: #7dd3fc;
  --accent-dark: #0284c7;
  --accent-glow: rgba(56, 189, 248, 0.35);
  --accent-gradient: linear-gradient(135deg, #38bdf8 0%, #818cf8 100%);
  --accent-gradient-hover: linear-gradient(135deg, #0284c7 0%, #6366f1 100%);

  --danger: #ef4444;
  --danger-hover: #dc2626;
  --success: #10b981;

  --user-bubble-bg: #101016;
  --user-bubble-border: #222230;
  --ai-bubble-bg: transparent;

  --diagram-grid-dot: rgba(56, 189, 248, 0.15);
  --diagram-grid-bg: #000000;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.8);
  --shadow-md: 0 4px 12px 0 rgba(0, 0, 0, 0.9);
  --shadow-lg: 0 10px 25px -3px rgba(0, 0, 0, 0.95);
  --shadow-glow: 0 0 22px rgba(56, 189, 248, 0.35);
}

/* ==========================================================================
   RESET & BASE STYLES
   ========================================================================== */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* Ensure hidden attribute is never overridden by display: flex/block */
[hidden],
.modal-overlay[hidden],
.lightbox-overlay[hidden],
.image-preview-card[hidden],
.btn-scroll-bottom[hidden],
.clear-search-btn[hidden] {
  display: none !important;
}

/* Sidebar backdrop hidden on desktop by default */
.sidebar-backdrop {
  display: none;
}

html, body {
  height: 100%;
  width: 100%;
  overflow: hidden;
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

button, input, textarea, select {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  background: none;
  border: none;
  outline: none;
}

button {
  cursor: pointer;
  user-select: none;
}

a {
  color: var(--accent-light);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  text-decoration: underline;
}

/* Custom Scrollbars */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* ==========================================================================
   APP LAYOUT & STRUCTURE
   ========================================================================== */

.app-layout {
  display: flex;
  width: 100vw;
  height: 100vh;
  position: relative;
  overflow: hidden;
}

/* ==========================================================================
   SIDEBAR COMPONENT
   ========================================================================== */

.sidebar {
  width: var(--sidebar-width);
  height: 100%;
  background-color: var(--bg-secondary);
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), margin-left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 40;
}

/* Desktop Collapsed State */
.sidebar.collapsed {
  margin-left: calc(var(--sidebar-width) * -1);
}

.sidebar-header {
  height: 64px;
  padding: 0 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-subtle);
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.brand-spark-logo,
.brand-xaren-logo {
  width: 28px;
  height: 28px;
  filter: drop-shadow(0 0 8px var(--accent-glow));
  transition: transform var(--transition-normal), filter var(--transition-normal);
}

.brand-link:hover .brand-xaren-logo,
.brand-link:hover .brand-spark-logo {
  transform: scale(1.1) rotate(6deg);
  filter: drop-shadow(0 0 14px var(--accent-glow));
}

.brand-title {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.mobile-only-btn {
  display: none;
}

/* New Chat Button */
.sidebar-actions {
  padding: 14px 14px 8px;
}

.btn-new-chat {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  font-weight: 500;
  font-size: 0.9rem;
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.btn-new-chat:hover {
  background-color: var(--bg-hover);
  border-color: var(--accent);
  box-shadow: 0 0 12px var(--accent-glow);
}

.shortcut-badge {
  margin-left: auto;
  font-size: 0.72rem;
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-strong);
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* Search Chats */
.sidebar-search {
  padding: 6px 14px 10px;
}

.search-input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.search-icon {
  position: absolute;
  left: 10px;
  color: var(--text-muted);
  pointer-events: none;
}

.search-input {
  width: 100%;
  padding: 7px 30px 7px 32px;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  color: var(--text-primary);
  transition: border-color var(--transition-fast);
}

.search-input:focus {
  border-color: var(--accent);
}

.search-input::placeholder {
  color: var(--text-muted);
}

.clear-search-btn {
  position: absolute;
  right: 8px;
  color: var(--text-muted);
  font-size: 0.85rem;
  padding: 2px 4px;
}
.clear-search-btn:hover {
  color: var(--text-primary);
}

/* Conversation List */
.sidebar-conversations {
  flex: 1;
  overflow-y: auto;
  padding: 6px 10px;
}

.history-section-title {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  padding: 8px 10px 4px;
}

.conversation-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.conversation-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 10px;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  color: var(--text-secondary);
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast);
  position: relative;
  group: item;
}

.conversation-item:hover {
  background-color: var(--bg-hover);
  color: var(--text-primary);
}

.conversation-item.active {
  background-color: var(--bg-active);
  color: var(--text-primary);
  font-weight: 500;
}

.conversation-item.active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 3px;
  background: var(--accent-gradient);
  border-radius: 0 4px 4px 0;
}

.conversation-title-text {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  padding-right: 8px;
}

.conversation-item-actions {
  display: none;
  align-items: center;
  gap: 4px;
}

.conversation-item:hover .conversation-item-actions,
.conversation-item.active .conversation-item-actions {
  display: flex;
}

.item-action-btn {
  padding: 4px;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.item-action-btn:hover {
  color: var(--text-primary);
  background-color: var(--bg-hover);
}

.item-action-btn.delete-btn:hover {
  color: var(--danger);
}

.empty-conversations-state {
  padding: 24px 12px;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* Sidebar Footer */
.sidebar-footer {
  padding: 10px 12px;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  gap: 4px;
  background-color: var(--bg-secondary);
}

.footer-action-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 8px 10px;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.footer-action-btn:hover {
  background-color: var(--bg-hover);
  color: var(--text-primary);
}

.footer-action-btn.danger-hover:hover {
  color: var(--danger);
}

.persona-current-pill,
.theme-current-pill {
  margin-left: auto;
  font-size: 0.72rem;
  padding: 2px 7px;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  color: var(--accent-light);
  font-weight: 500;
  max-width: 110px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.theme-icon-container {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.theme-icon-sun, .theme-icon-moon {
  display: block;
}

[data-theme="paper"] .theme-icon-sun,
[data-theme="light"] .theme-icon-sun {
  display: none;
}
[data-theme="paper"] .theme-icon-moon,
[data-theme="light"] .theme-icon-moon {
  display: block;
}

/* ==========================================================================
   MAIN WORKSPACE AREA
   ========================================================================== */

.main-workspace {
  flex: 1;
  display: flex;
  flex-direction: column;
  height: 100%;
  background-color: var(--bg-primary);
  position: relative;
  overflow: hidden;
}

/* Top Nav Header */
.top-nav {
  height: 60px;
  padding: 0 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-subtle);
  background-color: var(--bg-secondary);
  z-index: 20;
}

.top-nav-left, .top-nav-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.icon-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.icon-btn:hover {
  background-color: var(--bg-hover);
  color: var(--text-primary);
}

.chat-title-container {
  display: flex;
  align-items: center;
  gap: 6px;
  max-width: 380px;
}

.active-chat-title {
  font-size: 0.95rem;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--text-primary);
}

.btn-rename-inline {
  width: 24px;
  height: 24px;
  opacity: 0.6;
}
.btn-rename-inline:hover {
  opacity: 1;
}

/* Model Selector Dropdown */
.model-select-wrapper {
  display: flex;
  align-items: center;
  gap: 6px;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  padding: 4px 10px 4px 8px;
  transition: border-color var(--transition-fast);
}

.model-select-wrapper:hover {
  border-color: var(--accent);
}

.model-icon {
  color: var(--accent);
}

.model-select {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-primary);
  background: transparent;
  border: none;
  cursor: pointer;
}

.model-select option {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
}

/* Top Persona Quick Pill */
.top-persona-pill {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  padding: 5px 10px;
  border-radius: var(--radius-full);
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.top-persona-pill:hover {
  border-color: var(--accent);
  color: var(--text-primary);
}

.persona-indicator-dot {
  width: 7px;
  height: 7px;
  border-radius: var(--radius-full);
  background-color: var(--accent);
  box-shadow: 0 0 6px var(--accent);
}

/* ==========================================================================
   MESSAGES VIEWPORT & CHAT CONTENT
   ========================================================================== */

.messages-viewport {
  flex: 1;
  overflow-y: auto;
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 20px 16px 140px;
}

.messages-list {
  width: 100%;
  max-width: var(--content-max-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

/* Empty State: Welcome Hero */
.welcome-hero {
  max-width: var(--content-max-width);
  margin: auto auto;
  padding: 40px 16px 20px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  animation: fadeIn 0.4s ease-out;
}

.hero-spark-wrapper {
  margin-bottom: 20px;
}

.hero-spark-icon,
.hero-xaren-icon {
  width: 64px;
  height: 64px;
  filter: drop-shadow(0 0 24px var(--accent-glow));
  animation: pulseGlow 3s infinite ease-in-out;
}

.hero-title {
  font-size: 1.85rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  margin-bottom: 10px;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 520px;
  margin-bottom: 36px;
}

/* Starter Cards */
.starter-cards-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  width: 100%;
  max-width: 720px;
}

.starter-card {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px;
  text-align: left;
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  transition: all var(--transition-normal);
}

.starter-card:hover {
  background-color: var(--bg-tertiary);
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 18px var(--accent-glow);
}

.card-icon {
  font-size: 1.4rem;
  line-height: 1;
}

.card-text {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.card-title {
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--text-primary);
}

.card-desc {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.4;
}

/* ==========================================================================
   CHAT MESSAGES
   ========================================================================== */

.message-row {
  display: flex;
  gap: 16px;
  width: 100%;
  animation: messageFadeIn 0.3s ease-out;
}

.message-row.user-row {
  justify-content: flex-end;
}

.message-row.assistant-row {
  justify-content: flex-start;
}

.message-avatar {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.user-avatar {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-strong);
  color: var(--text-secondary);
}

.assistant-avatar {
  background: var(--accent-gradient);
  box-shadow: 0 0 12px var(--accent-glow);
}

.ai-spark-avatar-icon {
  width: 22px;
  height: 22px;
}

.message-content-wrapper {
  max-width: 85%;
  display: flex;
  flex-direction: column;
}

.user-row .message-content-wrapper {
  align-items: flex-end;
}

.assistant-row .message-content-wrapper {
  align-items: flex-start;
  width: calc(100% - 52px);
}

/* User Message Bubble */
.user-bubble {
  background-color: var(--user-bubble-bg);
  border: 1px solid var(--user-bubble-border);
  padding: 12px 18px;
  border-radius: var(--radius-lg) var(--radius-lg) 2px var(--radius-lg);
  color: var(--text-primary);
  font-size: 0.95rem;
  word-break: break-word;
  white-space: pre-wrap;
  box-shadow: var(--shadow-sm);
}

/* User Image Attachment in Message */
.message-attached-image {
  margin-bottom: 8px;
  max-width: 240px;
  max-height: 240px;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border-subtle);
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.message-attached-image:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow-md);
}

.message-attached-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* AI Message Body */
.ai-body {
  width: 100%;
  color: var(--text-primary);
  font-size: 0.96rem;
  line-height: 1.7;
  word-break: break-word;
}

/* ==========================================================================
   MARKDOWN & HIGHLIGHT & MATH FORMATTING
   ========================================================================== */

.ai-body h1, .ai-body h2, .ai-body h3, .ai-body h4 {
  color: var(--text-primary);
  margin-top: 1.4em;
  margin-bottom: 0.5em;
  font-weight: 600;
  line-height: 1.3;
}
.ai-body h1 { font-size: 1.5rem; }
.ai-body h2 { font-size: 1.3rem; }
.ai-body h3 { font-size: 1.15rem; }

.ai-body p {
  margin-bottom: 0.9em;
}

.ai-body p:last-child {
  margin-bottom: 0;
}

.ai-body ul, .ai-body ol {
  margin-bottom: 1em;
  padding-left: 1.6em;
}

.ai-body li {
  margin-bottom: 0.35em;
}

.ai-body blockquote {
  border-left: 3px solid var(--accent);
  padding-left: 14px;
  margin: 1em 0;
  color: var(--text-secondary);
  font-style: italic;
  background-color: var(--bg-hover);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding-top: 6px;
  padding-bottom: 6px;
}

.ai-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.2em 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border-subtle);
}

.ai-body th, .ai-body td {
  padding: 10px 14px;
  border: 1px solid var(--border-subtle);
  text-align: left;
}

.ai-body th {
  background-color: var(--bg-tertiary);
  font-weight: 600;
  color: var(--text-primary);
}

.ai-body tr:nth-child(even) {
  background-color: var(--bg-hover);
}

/* Inline Code */
.ai-body :not(pre) > code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  padding: 2px 6px;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--accent-light);
}

/* Code Blocks with Header & Copy Button */
.code-block-wrapper {
  margin: 1.2em 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border-subtle);
  background-color: var(--bg-code-block);
  box-shadow: var(--shadow-sm);
}

.code-block-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 14px;
  background-color: var(--bg-code-header);
  border-bottom: 1px solid var(--border-subtle);
  font-size: 0.78rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
}

.code-lang-label {
  text-transform: lowercase;
  font-weight: 500;
}

.btn-copy-code {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  color: var(--text-secondary);
  background-color: transparent;
  transition: all var(--transition-fast);
}

.btn-copy-code:hover {
  background-color: var(--bg-hover);
  color: var(--text-primary);
}

.btn-copy-code.copied {
  color: var(--success);
}

.code-block-wrapper pre {
  margin: 0;
  padding: 14px 16px;
  overflow-x: auto;
}

.code-block-wrapper code {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  line-height: 1.55;
  background: transparent !important;
  padding: 0 !important;
}

/* KaTeX Math Styling */
.katex-display {
  margin: 1.2em 0 !important;
  overflow-x: auto;
  overflow-y: hidden;
  padding: 10px 0;
}

.katex {
  font-size: 1.08em;
  color: inherit;
}

/* Streaming Blinking Cursor */
.streaming-cursor {
  display: inline-block;
  width: 8px;
  height: 1.15em;
  background: var(--accent-light);
  margin-left: 4px;
  vertical-align: text-bottom;
  border-radius: 2px;
  animation: blinkCursor 0.85s infinite ease-in-out;
}

@keyframes blinkCursor {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

/* Message Actions Bar (Copy, Edit, Regenerate) */
.message-actions-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 6px;
  opacity: 0.25;
  transition: opacity var(--transition-fast);
}

.message-row:hover .message-actions-bar {
  opacity: 1;
}

.msg-action-btn {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 0.76rem;
  color: var(--text-muted);
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.msg-action-btn:hover {
  background-color: var(--bg-hover);
  color: var(--text-primary);
}

/* Error Card with Retry Button */
.error-card {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 16px;
  background-color: rgba(239, 68, 68, 0.08);
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-radius: var(--radius-md);
  color: var(--danger);
  margin-top: 8px;
  width: 100%;
}

.error-card-content {
  flex: 1;
  font-size: 0.9rem;
}

.btn-retry {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 8px;
  padding: 6px 12px;
  background-color: var(--danger);
  color: #ffffff;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  font-weight: 500;
  transition: background-color var(--transition-fast);
}

.btn-retry:hover {
  background-color: var(--danger-hover);
}

/* Floating Scroll to Bottom Button */
.btn-scroll-bottom {
  position: fixed;
  bottom: 120px;
  right: 28px;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-full);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-strong);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  z-index: 30;
  transition: all var(--transition-fast);
}

.btn-scroll-bottom:hover {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  transform: translateY(-2px);
}

/* ==========================================================================
   INPUT BAR COMPONENT (FIXED BOTTOM)
   ========================================================================== */

.chat-input-wrapper {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 0 16px 16px;
  background: linear-gradient(to top, var(--bg-primary) 70%, transparent);
  pointer-events: none;
  z-index: 25;
}

.chat-input-container {
  width: 100%;
  max-width: var(--content-max-width);
  margin: 0 auto;
  pointer-events: auto;
}

/* Universal File & Image Attachment Preview Card */
.image-preview-card,
.file-preview-card {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 6px 14px 6px 8px;
  margin-bottom: 8px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  animation: slideUp 0.2s ease-out;
}

.preview-thumb-container,
.file-preview-thumb-container {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background-color: var(--bg-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  border: 1px solid var(--border-subtle);
}

.preview-thumb-container img,
.file-preview-thumb-container img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.preview-file-icon {
  font-size: 22px;
  line-height: 1;
}

.preview-info,
.file-preview-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.preview-filename {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-primary);
  max-width: 220px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.preview-meta-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.preview-filetype {
  font-size: 0.7rem;
  color: var(--accent-light);
  font-weight: 500;
}

.preview-filesize {
  font-size: 0.7rem;
  color: var(--text-muted);
}

/* User Message Attached File Badge */
.message-attached-file-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
  margin-bottom: 8px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  align-self: flex-end;
}

.file-badge-icon {
  font-size: 20px;
  line-height: 1;
}

.file-badge-info {
  display: flex;
  flex-direction: column;
}

.file-badge-name {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-primary);
  max-width: 220px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.file-badge-meta {
  font-size: 0.68rem;
  color: var(--text-muted);
}

/* Full-Screen Drag-and-Drop Overlay */
.drop-zone-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: rgba(11, 13, 23, 0.82);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s ease;
}

.drop-zone-overlay.active,
.drop-zone-overlay:not([hidden]) {
  opacity: 1;
  pointer-events: auto;
}

.drop-zone-box {
  width: 90%;
  max-width: 520px;
  padding: 48px 36px;
  border-radius: 20px;
  border: 2px dashed var(--accent);
  background: var(--bg-card);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.4), 0 0 40px rgba(99, 102, 241, 0.2);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  animation: zoomIn 0.25s ease-out;
}

.drop-zone-icon {
  font-size: 52px;
  line-height: 1;
}

.drop-zone-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

.drop-zone-subtitle {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin: 0;
  max-width: 420px;
}

.btn-remove-attachment {
  width: 22px;
  height: 22px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 0.8rem;
  transition: all var(--transition-fast);
}

.btn-remove-attachment:hover {
  background-color: var(--bg-hover);
  color: var(--danger);
}

/* Chat Form */
.chat-form {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  padding: 8px 12px;
  background-color: var(--bg-input);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(12px);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.chat-form:focus-within {
  border-color: var(--border-focus);
  box-shadow: 0 0 16px var(--accent-glow);
}

.input-action-btn {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.input-action-btn:hover {
  background-color: var(--bg-hover);
  color: var(--accent-light);
}

.chat-textarea {
  flex: 1;
  resize: none;
  min-height: 24px;
  max-height: 180px;
  padding: 6px 4px;
  font-size: 0.95rem;
  line-height: 1.5;
  color: var(--text-primary);
  border: none;
  outline: none;
  background: transparent;
}

.chat-textarea::placeholder {
  color: var(--text-muted);
}

/* Send / Stop Generating Button */
.btn-send-stop {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-full);
  background: var(--accent-gradient);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: transform var(--transition-fast), opacity var(--transition-fast), box-shadow var(--transition-fast);
}

.btn-send-stop:hover {
  transform: scale(1.05);
  box-shadow: 0 0 14px var(--accent-glow);
}

.btn-send-stop:disabled {
  opacity: 0.35;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.btn-send-stop .icon-stop {
  display: none;
}

/* Streaming Active State: Stop Button */
.btn-send-stop.is-streaming {
  background: var(--danger);
  animation: pulseStop 1.8s infinite;
}

.btn-send-stop.is-streaming .icon-send {
  display: none;
}

.btn-send-stop.is-streaming .icon-stop {
  display: block;
}

.input-disclaimer {
  text-align: center;
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 8px;
}

/* ==========================================================================
   MODAL COMPONENT (PERSONAS & SETTINGS)
   ========================================================================== */

.modal-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 16px;
  animation: fadeIn 0.2s ease-out;
}

.modal-overlay[hidden] {
  display: none !important;
}

.modal-card {
  width: 100%;
  max-width: 580px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  animation: modalScale 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-subtle);
}

.modal-header-left {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--accent-light);
}

.modal-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.modal-body {
  padding: 20px;
  overflow-y: auto;
  max-height: 70vh;
}

.modal-description {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

/* Persona Presets Grid */
.persona-presets-grid {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 18px;
}

.preset-option-card {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 14px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.preset-option-card:hover {
  background-color: var(--bg-hover);
  border-color: var(--accent);
}

.preset-option-card input[type="radio"] {
  margin-top: 3px;
  accent-color: var(--accent);
  cursor: pointer;
}

.preset-card-content {
  display: flex;
  flex-direction: column;
}

.preset-name {
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--text-primary);
}

.preset-summary {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Custom Prompt Area */
.custom-prompt-container {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-label {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.custom-prompt-textarea {
  width: 100%;
  padding: 10px 12px;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  line-height: 1.5;
  color: var(--text-primary);
  resize: vertical;
}

.custom-prompt-textarea:focus {
  border-color: var(--accent);
}

.modal-footer {
  padding: 14px 20px;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
}

/* Generic Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 16px;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.btn-secondary {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background-color: var(--bg-hover);
}

.btn-primary {
  background: var(--accent-gradient);
  color: #ffffff;
}

.btn-primary:hover {
  box-shadow: 0 0 14px var(--accent-glow);
}

/* ==========================================================================
   IMAGE LIGHTBOX MODAL
   ========================================================================== */

.lightbox-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.88);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 120;
  padding: 24px;
}

.lightbox-overlay[hidden] {
  display: none !important;
}

.lightbox-overlay img {
  max-width: 90vw;
  max-height: 90vh;
  object-fit: contain;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
}

.lightbox-close-btn {
  position: absolute;
  top: 24px;
  right: 24px;
  font-size: 1.5rem;
  color: #ffffff;
  background-color: rgba(255, 255, 255, 0.15);
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color var(--transition-fast);
}

.lightbox-close-btn:hover {
  background-color: rgba(255, 255, 255, 0.3);
}

/* ==========================================================================
   TOAST NOTIFICATIONS
   ========================================================================== */

.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 200;
  pointer-events: none;
}

.toast {
  padding: 10px 16px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-strong);
  color: var(--text-primary);
  border-radius: var(--radius-md);
  font-size: 0.86rem;
  box-shadow: var(--shadow-lg);
  pointer-events: auto;
  animation: toastIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  align-items: center;
  gap: 8px;
}

.toast.toast-success {
  border-left: 3px solid var(--success);
}

.toast.toast-error {
  border-left: 3px solid var(--danger);
}

/* ==========================================================================
   ANIMATIONS & KEYFRAMES
   ========================================================================== */

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes messageFadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes modalScale {
  from { opacity: 0; transform: scale(0.95); }
  to { opacity: 1; transform: scale(1); }
}

@keyframes toastIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes pulseGlow {
  0%, 100% { transform: scale(1); filter: drop-shadow(0 0 20px var(--accent-glow)); }
  50% { transform: scale(1.05); filter: drop-shadow(0 0 32px var(--accent-glow)); }
}

@keyframes pulseStop {
  0%, 100% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.4); }
  50% { box-shadow: 0 0 0 8px rgba(239, 68, 68, 0); }
}

/* ==========================================================================
   RESPONSIVE DESIGN (MOBILE & TABLET)
   ========================================================================== */

/* ==========================================================================
   RESPONSIVE DESIGN SYSTEM (MOBILE & TABLET - FLAWLESS ADAPTATION)
   ========================================================================== */

/* Universal Touch Device Optimizations */
@media (hover: none) and (pointer: coarse) {
  * {
    -webkit-tap-highlight-color: transparent;
  }

  /* Make message action buttons visible on touch without requiring mouse hover */
  .message-actions {
    opacity: 0.88 !important;
    visibility: visible !important;
  }

  .message-action-btn {
    opacity: 0.9 !important;
  }
}

/* 1. TABLET & LAPTOP ADAPTATION (<= 1024px) */
@media (max-width: 1024px) {
  :root {
    --content-max-width: 100%;
  }

  .main-workspace {
    width: 100%;
  }

  .starter-cards-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }

  .chat-title-container {
    max-width: 240px;
  }

  .message-content-wrapper {
    max-width: 90%;
  }

  .canvas-modal-card {
    width: 96vw;
    height: 92vh;
    max-height: 92vh;
  }
}

/* 2. TABLET PORTRAIT & MEDIUM MOBILE (<= 900px) */
@media (max-width: 900px) {
  /* Sidebar becomes smooth off-canvas drawer */
  .sidebar {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    width: min(320px, 86vw);
    max-width: 320px;
    height: 100%;
    height: 100dvh;
    transform: translateX(-100%);
    box-shadow: 4px 0 24px rgba(0, 0, 0, 0.45);
    z-index: 100;
    transition: transform 0.28s cubic-bezier(0.16, 1, 0.3, 1);
    padding-bottom: max(16px, env(safe-area-inset-bottom));
  }

  .sidebar.mobile-open {
    transform: translateX(0);
  }

  /* Backdrop Overlay with Blur */
  .sidebar-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.65);
    z-index: 95;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    transition: opacity 0.25s ease;
  }

  .sidebar-backdrop.active {
    display: block;
  }

  .mobile-only-btn {
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .top-nav {
    padding: 0 12px;
    height: 56px;
  }

  .top-nav-left, .top-nav-right {
    gap: 8px;
  }

  .chat-title-container {
    max-width: 180px;
  }

  .message-content-wrapper {
    max-width: 94%;
  }
}

/* 3. MOBILE & SMALL TABLET (<= 768px) */
@media (max-width: 768px) {
  /* Dynamic viewport height adjustments */
  .app-layout {
    height: 100vh;
    height: 100dvh;
    overflow: hidden;
  }

  .main-workspace {
    height: 100vh;
    height: 100dvh;
  }

  /* Top Navigation Bar */
  .top-nav {
    height: 52px;
    padding: 0 10px;
    gap: 6px;
  }

  .top-nav-left {
    gap: 6px;
    min-width: 0;
    flex-shrink: 1;
  }

  .top-nav-right {
    gap: 6px;
    flex-shrink: 0;
  }

  .chat-title-container {
    max-width: 130px;
    min-width: 0;
  }

  .active-chat-title {
    font-size: 0.88rem;
  }

  .btn-rename-inline {
    width: 22px;
    height: 22px;
  }

  .model-select-wrapper {
    padding: 2px 6px;
    gap: 4px;
  }

  .model-select {
    font-size: 0.78rem;
    padding: 4px 6px;
    max-width: 110px;
  }

  .btn-cycle-model {
    padding: 5px 8px;
    font-size: 0.75rem;
    gap: 4px;
  }

  .top-api-keys-btn {
    padding: 5px 8px;
    font-size: 0.75rem;
    gap: 4px;
  }

  .top-persona-pill {
    padding: 4px 8px;
    font-size: 0.75rem;
  }

  /* Welcome Screen Hero */
  .welcome-hero {
    padding: 20px 12px 100px;
  }

  .hero-spark-wrapper {
    width: 60px;
    height: 60px;
  }

  .hero-title {
    font-size: 1.35rem;
    line-height: 1.3;
  }

  .hero-subtitle {
    font-size: 0.84rem;
    padding: 0 8px;
  }

  .starter-cards-grid {
    grid-template-columns: 1fr;
    gap: 8px;
    width: 100%;
    max-width: 460px;
  }

  .starter-card {
    padding: 12px 14px;
  }

  /* Messages Viewport */
  .messages-viewport {
    padding: 12px 10px calc(95px + env(safe-area-inset-bottom, 10px)) 10px;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior-y: contain;
  }

  .messages-list {
    gap: 16px;
  }

  .message-row {
    padding: 8px 4px;
    gap: 8px;
  }

  .message-avatar {
    width: 28px;
    height: 28px;
    font-size: 13px;
    flex-shrink: 0;
  }

  .message-content-wrapper {
    max-width: calc(100% - 36px);
    width: 100%;
  }

  .message-bubble {
    padding: 10px 13px;
    font-size: 0.92rem;
    line-height: 1.55;
    border-radius: var(--radius-md);
  }

  /* Markdown Elements on Mobile */
  .message-body pre {
    max-width: 100%;
    margin: 8px 0;
    border-radius: var(--radius-sm);
  }

  .message-body pre code {
    font-size: 0.8rem;
    padding: 12px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    white-space: pre;
    word-break: normal;
  }

  .message-body table {
    display: block;
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    font-size: 0.82rem;
    margin: 10px 0;
  }

  .message-body .katex-display {
    overflow-x: auto;
    overflow-y: hidden;
    max-width: 100%;
    -webkit-overflow-scrolling: touch;
    padding: 6px 0;
    margin: 8px 0;
  }

  .mermaid-wrapper, .mermaid {
    max-width: 100% !important;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .message-actions {
    gap: 4px;
    margin-top: 4px;
  }

  .message-action-btn {
    padding: 3px 6px;
    font-size: 0.72rem;
  }

  /* Input Bar on Mobile */
  .chat-input-wrapper {
    padding: 0 8px max(10px, env(safe-area-inset-bottom, 8px));
  }

  .chat-input-container {
    max-width: 100%;
  }

  .chat-form {
    padding: 6px 8px;
    gap: 4px;
    border-radius: 20px;
  }

  .input-action-btn {
    width: 32px;
    height: 32px;
    font-size: 15px;
  }

  /* Crucial iOS fix: 16px font prevents auto-zoom on mobile input focus */
  .chat-textarea {
    font-size: 16px !important;
    line-height: 1.4;
    padding: 5px 4px;
    min-height: 22px;
    max-height: 130px;
  }

  .btn-send-stop {
    width: 34px;
    height: 34px;
  }

  /* Universal Modal Card Adjustments */
  .modal-overlay {
    padding: 8px;
    align-items: center;
  }

  .modal-card {
    width: 96vw;
    max-width: 96vw;
    max-height: calc(90dvh);
    border-radius: var(--radius-md);
  }

  .modal-header {
    padding: 12px 14px;
  }

  .modal-title {
    font-size: 0.98rem;
  }

  .modal-body {
    padding: 12px 14px;
    max-height: calc(85dvh - 105px);
  }

  .modal-footer {
    padding: 10px 14px;
    gap: 8px;
  }

  .btn {
    padding: 7px 12px;
    font-size: 0.82rem;
  }

  /* Live Code Canvas Modal on Mobile & Tablet */
  .canvas-modal-card {
    width: 98vw;
    height: 94dvh;
    max-height: 94dvh;
  }

  .canvas-modal-header {
    padding: 8px 10px;
    flex-wrap: wrap;
    gap: 6px;
  }

  .canvas-viewport-switcher {
    display: none !important;
  }

  .canvas-header-actions {
    gap: 4px;
  }

  .canvas-action-btn {
    padding: 4px 6px;
    font-size: 0.72rem;
  }

  /* Image Studio on Mobile */
  .studio-modal-card {
    width: 96vw;
  }

  .studio-styles-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 6px;
  }

  .studio-aspect-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 6px;
  }

  /* Custom API Provider on Mobile */
  .custom-fields-grid {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .preset-pills-bar {
    gap: 4px;
  }

  .btn-preset-pill {
    padding: 3px 8px;
    font-size: 0.72rem;
  }

  .custom-actions-bar {
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
  }
}

/* 4. COMPACT MOBILE SCREENS (<= 480px) */
@media (max-width: 480px) {
  .top-nav {
    height: 50px;
    padding: 0 8px;
    gap: 4px;
  }

  .chat-title-container {
    max-width: 90px;
  }

  .active-chat-title {
    font-size: 0.82rem;
  }

  .btn-rename-inline {
    display: none;
  }

  /* Hide textual labels on ultra-compact screens: show clean icons */
  .cycle-label {
    display: none !important;
  }

  .api-keys-btn-text {
    display: none !important;
  }

  .btn-cycle-model {
    padding: 5px;
    min-width: 32px;
    height: 32px;
    justify-content: center;
  }

  .top-api-keys-btn {
    padding: 5px;
    min-width: 32px;
    height: 32px;
    justify-content: center;
  }

  .model-select {
    max-width: 86px;
    font-size: 0.72rem;
    padding: 3px 4px;
  }

  .top-persona-pill {
    display: none !important;
  }

  .input-action-btn {
    width: 30px;
    height: 30px;
    font-size: 14px;
  }

  .btn-send-stop {
    width: 32px;
    height: 32px;
  }

  .studio-styles-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .studio-aspect-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ==========================================================================
   AI IMAGE STUDIO & GENERATED IMAGE STYLES
   ========================================================================== */

/* Button in Input Bar */
.btn-imagine-spark {
  color: var(--accent-light);
  transition: all var(--transition-fast);
}

.btn-imagine-spark:hover {
  color: #c084fc;
  background-color: rgba(168, 85, 247, 0.15);
  box-shadow: 0 0 12px rgba(168, 85, 247, 0.35);
  transform: translateY(-1px);
}

/* Starter Card: Image Studio */
.starter-card-imagine {
  border-color: rgba(168, 85, 247, 0.35);
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.08) 0%, rgba(168, 85, 247, 0.12) 100%);
}

.starter-card-imagine:hover {
  border-color: #a855f7;
  box-shadow: 0 4px 18px rgba(168, 85, 247, 0.25);
  transform: translateY(-2px);
}

/* Image Studio Modal */
.studio-modal-card {
  max-width: 620px;
  width: 95%;
}

.studio-field-group {
  margin-bottom: 20px;
}

.studio-label-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 6px;
}

.btn-text-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--accent-light);
  cursor: pointer;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  background: rgba(99, 102, 241, 0.1);
  transition: all var(--transition-fast);
}

.btn-text-link:hover {
  color: #fff;
  background: var(--accent);
  transform: translateY(-1px);
}

.studio-prompt-textarea {
  width: 100%;
  padding: 12px 14px;
  background-color: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.95rem;
  line-height: 1.5;
  resize: vertical;
  min-height: 80px;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.studio-prompt-textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

/* Styles Grid */
.studio-styles-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
}

@media (max-width: 600px) {
  .studio-styles-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.style-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 10px 6px;
  background-color: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: center;
  user-select: none;
}

.style-card input[type="radio"] {
  display: none;
}

.style-card .style-icon {
  font-size: 1.35rem;
  margin-bottom: 4px;
}

.style-card .style-name {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.style-card:hover {
  border-color: var(--border-strong);
  background-color: var(--bg-hover);
  transform: translateY(-1px);
}

.style-card.selected {
  border-color: var(--accent);
  background-color: rgba(99, 102, 241, 0.15);
  box-shadow: 0 0 12px var(--accent-glow);
}

.style-card.selected .style-name {
  color: var(--text-primary);
  font-weight: 600;
}

/* Aspect Ratio Grid */
.studio-aspect-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
}

@media (max-width: 600px) {
  .studio-aspect-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.aspect-pill {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 8px 6px;
  background-color: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
}

.aspect-pill input[type="radio"] {
  display: none;
}

.aspect-icon-box {
  display: block;
  border: 1.5px dashed var(--text-muted);
  border-radius: 3px;
  margin-bottom: 6px;
  transition: all var(--transition-fast);
}

.aspect-box-1-1 { width: 18px; height: 18px; }
.aspect-box-16-9 { width: 24px; height: 14px; }
.aspect-box-9-16 { width: 14px; height: 24px; }
.aspect-box-4-3 { width: 20px; height: 15px; }
.aspect-box-3-4 { width: 15px; height: 20px; }

.aspect-label {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.aspect-pill:hover {
  border-color: var(--border-strong);
  background-color: var(--bg-hover);
}

.aspect-pill.selected {
  border-color: var(--accent);
  background-color: rgba(99, 102, 241, 0.15);
  box-shadow: 0 0 12px var(--accent-glow);
}

.aspect-pill.selected .aspect-icon-box {
  border-color: var(--accent-light);
  border-style: solid;
  background-color: rgba(99, 102, 241, 0.25);
}

.aspect-pill.selected .aspect-label {
  color: var(--text-primary);
  font-weight: 600;
}

/* Toggle Row */
.studio-toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 14px;
  background-color: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
}

.studio-toggle-label {
  display: flex;
  flex-direction: column;
  cursor: pointer;
}

.toggle-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
}

.toggle-subtitle {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.toggle-checkbox {
  width: 20px;
  height: 20px;
  accent-color: var(--accent);
  cursor: pointer;
}

.btn-generate-submit {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent-gradient);
  color: #fff;
  font-weight: 600;
  box-shadow: 0 4px 14px var(--accent-glow);
}

.btn-generate-submit:hover {
  background: var(--accent-gradient-hover);
  box-shadow: 0 6px 20px var(--accent-glow);
  transform: translateY(-1px);
}

/* ==========================================================================
   GENERATED IMAGE MESSAGE CARDS
   ========================================================================== */

/* Shimmer / Loading State */
.image-generating-card {
  width: 100%;
  max-width: 540px;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.12), rgba(168, 85, 247, 0.18));
  border: 1px solid rgba(168, 85, 247, 0.4);
  padding: 24px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
  animation: borderGlow 2.5s infinite ease-in-out;
}

@keyframes borderGlow {
  0%, 100% { border-color: rgba(99, 102, 241, 0.4); box-shadow: 0 0 15px rgba(99, 102, 241, 0.2); }
  50% { border-color: rgba(168, 85, 247, 0.8); box-shadow: 0 0 25px rgba(168, 85, 247, 0.4); }
}

.image-generating-shimmer {
  display: flex;
  align-items: center;
  gap: 16px;
}

.spark-spinner {
  width: 38px;
  height: 38px;
  border: 3px solid rgba(255, 255, 255, 0.15);
  border-top-color: var(--accent-light);
  border-right-color: #c084fc;
  border-radius: 50%;
  animation: spin 1s linear infinite;
  flex-shrink: 0;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.generating-text {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.generating-title {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-primary);
}

.generating-prompt {
  font-size: 0.85rem;
  font-style: italic;
  color: var(--text-secondary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.generating-subtext {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Completed Generated Image Card */
.generated-image-card {
  width: 100%;
  max-width: 580px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  margin: 6px 0 12px 0;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.generated-image-card:hover {
  box-shadow: var(--shadow-lg), 0 0 20px rgba(99, 102, 241, 0.15);
}

/* Badges Bar */
.image-badges-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  background-color: rgba(0, 0, 0, 0.25);
  border-bottom: 1px solid var(--border-subtle);
}

.img-badge {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 2px 7px;
  border-radius: var(--radius-sm);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.style-badge {
  background-color: rgba(99, 102, 241, 0.2);
  color: var(--accent-light);
  border: 1px solid rgba(99, 102, 241, 0.35);
}

.ratio-badge {
  background-color: rgba(255, 255, 255, 0.08);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
}

.engine-badge {
  background-color: rgba(16, 185, 129, 0.15);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.3);
  margin-left: auto;
}

/* Image Wrapper */
.image-wrapper {
  position: relative;
  width: 100%;
  background-color: #000;
  overflow: hidden;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.ratio-1-1 .image-wrapper { aspect-ratio: 1 / 1; }
.ratio-16-9 .image-wrapper { aspect-ratio: 16 / 9; }
.ratio-9-16 .image-wrapper { aspect-ratio: 9 / 16; max-height: 540px; }
.ratio-4-3 .image-wrapper { aspect-ratio: 4 / 3; }
.ratio-3-4 .image-wrapper { aspect-ratio: 3 / 4; max-height: 540px; }

.image-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  transition: transform 0.35s ease;
  display: block;
}

.image-wrapper:hover img {
  transform: scale(1.02);
}

.image-hover-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition-fast);
  backdrop-filter: blur(2px);
}

.image-wrapper:hover .image-hover-overlay {
  opacity: 1;
}

.view-enlarge-hint {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(0, 0, 0, 0.7);
  color: #fff;
  font-size: 0.85rem;
  font-weight: 500;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

/* Caption Container */
.image-caption-container {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-subtle);
  background-color: var(--bg-card);
}

.image-prompt-text {
  font-size: 0.88rem;
  color: var(--text-primary);
  line-height: 1.45;
  font-weight: 500;
}

.enhanced-prompt-details {
  margin-top: 6px;
  font-size: 0.78rem;
}

.enhanced-prompt-details summary {
  color: var(--accent-light);
  cursor: pointer;
  user-select: none;
  font-weight: 500;
}

.enhanced-prompt-text {
  margin-top: 4px;
  color: var(--text-muted);
  font-style: italic;
  line-height: 1.4;
  padding: 6px 8px;
  background-color: var(--bg-input);
  border-radius: var(--radius-sm);
}

/* Action Toolbar */
.image-card-actions {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  background-color: var(--bg-card);
  flex-wrap: wrap;
}

.img-action-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-secondary);
  background-color: var(--bg-input);
  border: 1px solid var(--border-subtle);
  padding: 5px 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.img-action-btn:hover {
  color: var(--text-primary);
  background-color: var(--bg-hover);
  border-color: var(--border-strong);
  transform: translateY(-1px);
}

.img-action-btn.accent-action {
  color: var(--accent-light);
  border-color: rgba(99, 102, 241, 0.35);
  background: rgba(99, 102, 241, 0.1);
  margin-left: auto;
}

.img-action-btn.accent-action:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  box-shadow: 0 2px 8px var(--accent-glow);
}

/* ==========================================================================
   THEME SELECTION MODAL & CARDS
   ========================================================================== */

.theme-modal-card {
  max-width: 620px;
}

.themes-grid {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 14px;
}

.theme-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 12px 16px;
  background-color: var(--bg-tertiary);
  border: 2px solid var(--border-subtle);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
  outline: none;
}

.theme-card:hover {
  border-color: var(--border-strong);
  background-color: var(--bg-hover);
  transform: translateY(-1px);
}

.theme-card:focus-visible {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.theme-card.active {
  border-color: var(--accent);
  background-color: var(--bg-card);
  box-shadow: var(--shadow-glow);
}

.theme-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.theme-badge-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
}

.theme-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
}

.theme-tag {
  font-size: 10px;
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.theme-tag.default-tag {
  background: rgba(139, 92, 246, 0.2);
  color: #a78bfa;
  border: 1px solid rgba(139, 92, 246, 0.35);
}

.theme-tag.mono-tag {
  background: rgba(0, 255, 136, 0.15);
  color: #00ff88;
  border: 1px solid rgba(0, 255, 136, 0.3);
  font-family: var(--font-mono);
}

.theme-tag.light-tag {
  background: rgba(37, 99, 235, 0.15);
  color: #3b82f6;
  border: 1px solid rgba(37, 99, 235, 0.3);
}

.theme-check-icon {
  display: none;
  width: 22px;
  height: 22px;
  border-radius: var(--radius-full);
  background: var(--accent-gradient);
  color: #ffffff;
  font-size: 13px;
  font-weight: 700;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.25);
  flex-shrink: 0;
}

.theme-card.active .theme-check-icon {
  display: flex;
}

.theme-card-desc {
  font-size: 12.5px;
  color: var(--text-secondary);
  line-height: 1.4;
  margin: 0;
}

.theme-preview-palette {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 4px;
}

.palette-swatch {
  width: 28px;
  height: 18px;
  border-radius: 4px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
  border: 1px solid rgba(255, 255, 255, 0.08);
  flex-shrink: 0;
}

.palette-swatch.swatch-gradient {
  width: 48px;
}

/* ==========================================================================
   PROMPT MAGIC WAND & TOAST ACTIONS
   ========================================================================== */

.btn-magic-wand {
  color: var(--accent-light);
  transition: all var(--transition-fast);
}

.btn-magic-wand:hover {
  color: #ffffff;
  background: var(--accent-gradient);
  box-shadow: 0 0 12px var(--accent-glow);
  transform: translateY(-1px);
}

.btn-magic-wand.polishing {
  pointer-events: none;
  animation: wandPulse 0.9s infinite alternate;
}

.btn-magic-wand.polishing svg {
  animation: wandSpin 1.4s infinite linear;
}

@keyframes wandPulse {
  from { transform: scale(1); filter: drop-shadow(0 0 2px var(--accent)); }
  to { transform: scale(1.15); filter: drop-shadow(0 0 10px var(--accent)); }
}

@keyframes wandSpin {
  0% { transform: rotate(0deg); }
  50% { transform: rotate(180deg) scale(1.1); }
  100% { transform: rotate(360deg); }
}

.prompt-polished-glow {
  animation: promptGlow 1.2s ease;
}

@keyframes promptGlow {
  0% { box-shadow: 0 0 0 3px var(--accent-glow), inset 0 0 15px var(--accent-glow); }
  100% { box-shadow: none; }
}

.toast {
  display: flex;
  align-items: center;
  gap: 12px;
}

.toast-action-btn {
  background: rgba(255, 255, 255, 0.18);
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: var(--radius-sm);
  color: #ffffff;
  font-size: 0.76rem;
  font-weight: 600;
  padding: 2px 8px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.toast-action-btn:hover {
  background: #ffffff;
  color: #0b0d17;
}

/* ==========================================================================
   CODE BLOCK "▶ RUN PREVIEW" BUTTON
   ========================================================================== */

.code-block-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn-run-code {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 9px;
  font-size: 0.74rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  background: var(--accent-gradient);
  color: #ffffff;
  border: none;
  cursor: pointer;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.25);
  transition: all var(--transition-fast);
}

.btn-run-code:hover {
  box-shadow: 0 3px 12px var(--accent-glow);
  transform: translateY(-1px);
  filter: brightness(1.1);
}

/* ==========================================================================
   MERMAID DIAGRAM ENGINE & CARDS (SLEEK & INTERACTIVE)
   ========================================================================== */

.diagram-card {
  margin: 18px 0;
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.diagram-card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-lg);
}

.diagram-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background-color: var(--bg-code-header);
  border-bottom: 1px solid var(--border-subtle);
  flex-wrap: wrap;
  gap: 10px;
}

.diagram-header-left {
  display: flex;
  align-items: center;
  gap: 8px;
}

.diagram-icon {
  font-size: 16px;
}

.diagram-title {
  font-size: 0.84rem;
  font-weight: 700;
  color: var(--text-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.diagram-badge {
  background: var(--bg-hover);
  border: 1px solid var(--accent);
  color: var(--accent-light);
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 1px 7px;
  border-radius: var(--radius-full);
}

.diagram-actions {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.diagram-zoom-group {
  display: inline-flex;
  align-items: center;
  background-color: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 2px 4px;
  gap: 2px;
}

.diagram-zoom-level {
  font-size: 0.72rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  background: transparent;
  border: none;
  min-width: 40px;
  text-align: center;
  cursor: pointer;
  padding: 2px 4px;
  border-radius: 3px;
  transition: all var(--transition-fast);
}

.diagram-zoom-level:hover {
  color: var(--accent-light);
  background: var(--bg-hover);
}

.btn-diagram-tool {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.74rem;
  font-weight: 500;
  padding: 4px 9px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  line-height: 1.3;
}

.btn-diagram-tool:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
  border-color: var(--border-strong);
}

.btn-zoom-fit {
  color: var(--accent-light);
  font-weight: 600;
}

.btn-zoom-fit:hover {
  background: var(--bg-hover);
  border-color: var(--accent);
}

.btn-copy-image {
  color: var(--accent-light);
}

.btn-copy-image:hover {
  border-color: var(--accent);
  background: var(--bg-hover);
}

/* Blueprint Studio Dot-Grid Canvas */
.diagram-viewport {
  width: 100%;
  min-height: 280px;
  max-height: 620px;
  overflow: hidden;
  position: relative;
  cursor: grab;
  background-color: var(--diagram-grid-bg, var(--bg-primary));
  background-image: radial-gradient(var(--diagram-grid-dot, rgba(255, 255, 255, 0.08)) 1.25px, transparent 1.25px);
  background-size: 22px 22px;
  background-position: 0 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 28px;
  box-sizing: border-box;
  user-select: none;
}

.diagram-viewport:active {
  cursor: grabbing;
}

.diagram-svg-container {
  display: flex;
  align-items: center;
  justify-content: center;
  transform-origin: center center;
  transition: transform 0.06s ease-out;
  max-width: 100%;
}

.diagram-svg-container svg {
  max-width: 100%;
  height: auto;
  overflow: visible;
  filter: drop-shadow(0 6px 20px rgba(0, 0, 0, 0.18));
}

/* Polished SVG Nodes & Clusters */
.diagram-svg-container svg .node rect,
.diagram-svg-container svg .node circle,
.diagram-svg-container svg .node polygon,
.diagram-svg-container svg .node path {
  transition: stroke var(--transition-fast), filter var(--transition-fast), stroke-width var(--transition-fast);
}

.diagram-svg-container svg .node:hover rect,
.diagram-svg-container svg .node:hover circle,
.diagram-svg-container svg .node:hover polygon {
  filter: drop-shadow(0 0 10px var(--accent-glow));
  stroke-width: 2.2px;
}

.diagram-svg-container svg .cluster rect {
  rx: 12px;
  ry: 12px;
  stroke-dasharray: 4 4;
}

.diagram-svg-container svg .edgePath path {
  stroke-linecap: round;
  stroke-linejoin: round;
}

.diagram-svg-container svg .edgeLabel {
  border-radius: 4px;
  font-size: 11px;
}

/* LaTeX / KaTeX Mathematical Typesetting in Flowcharts */
.diagram-svg-container .katex,
.diagram-lightbox-viewport .katex {
  font-size: 1.04em;
  color: inherit;
  line-height: 1.25;
}

.diagram-svg-container .katex-display,
.diagram-lightbox-viewport .katex-display {
  margin: 3px 0;
  display: inline-block;
}

.diagram-svg-container .nodeLabel,
.diagram-lightbox-viewport .nodeLabel {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  text-align: center;
  gap: 2px;
}

.diagram-svg-container .edgeLabel .katex,
.diagram-lightbox-viewport .edgeLabel .katex {
  font-size: 0.95em;
}

.diagram-error {

  padding: 16px 20px;
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.35);
  border-radius: var(--radius-md);
  color: var(--danger);
  font-size: 0.85rem;
  text-align: center;
  max-width: 520px;
}

.diagram-error-title {
  font-weight: 700;
  display: block;
  margin-bottom: 4px;
}

.diagram-error-msg {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  opacity: 0.9;
  line-height: 1.4;
}

/* Interactive Live Mermaid Code Workbench */
.diagram-code-drawer {
  background: var(--bg-code-block);
  border-top: 1px solid var(--border-subtle);
  padding: 14px 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.diagram-drawer-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}

.diagram-drawer-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-primary);
}

.drawer-hint {
  font-size: 0.72rem;
  font-weight: normal;
  color: var(--text-muted);
}

.diagram-drawer-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

.btn-primary-tool {
  background: var(--accent) !important;
  color: #ffffff !important;
  border-color: var(--accent) !important;
  font-weight: 600 !important;
}

.btn-primary-tool:hover {
  box-shadow: 0 0 12px var(--accent-glow) !important;
}

.diagram-code-editor {
  width: 100%;
  box-sizing: border-box;
  padding: 10px 12px;
  background: var(--bg-primary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.5;
  resize: vertical;
  outline: none;
}

.diagram-code-editor:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent);
}

.diagram-editor-error {
  padding: 8px 12px;
  background: rgba(239, 68, 68, 0.12);
  border: 1px solid rgba(239, 68, 68, 0.35);
  border-radius: var(--radius-sm);
  color: var(--danger);
  font-size: 0.78rem;
  line-height: 1.4;
}

/* Diagram Lightbox */
.diagram-lightbox {
  display: flex;
  flex-direction: column;
}

.diagram-lightbox-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  width: 100%;
  box-sizing: border-box;
  background: rgba(0, 0, 0, 0.4);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.diagram-lightbox-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: #ffffff;
}

.diagram-lightbox-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.diagram-lightbox-viewport {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  overflow: hidden;
  position: relative;
  background-color: var(--diagram-grid-bg, #080a12);
  background-image: radial-gradient(var(--diagram-grid-dot, rgba(255, 255, 255, 0.08)) 1.25px, transparent 1.25px);
  background-size: 22px 22px;
  cursor: grab;
}

.diagram-loading {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* ==========================================================================
   LIVE INTERACTIVE CODE CANVAS MODAL (ARTIFACTS)
   ========================================================================== */

.canvas-modal-card {
  width: 95vw;
  max-width: 1280px;
  height: 90vh;
  max-height: 860px;
  display: flex;
  flex-direction: column;
  padding: 0;
  overflow: hidden;
  border-radius: var(--radius-lg);
}

.canvas-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 18px;
  border-bottom: 1px solid var(--border-subtle);
  background: var(--bg-secondary);
}

.canvas-header-badge {
  background: rgba(16, 185, 129, 0.18);
  border: 1px solid rgba(16, 185, 129, 0.4);
  color: var(--success);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  margin-right: 6px;
}

.canvas-lang-pill {
  font-size: 0.72rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  background: var(--bg-tertiary);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  margin-left: 6px;
}

.canvas-viewport-switcher {
  display: inline-flex;
  background: var(--bg-tertiary);
  padding: 2px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  gap: 2px;
}

.viewport-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.76rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.viewport-btn.active {
  background: var(--bg-card);
  color: var(--text-primary);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.2);
}

.canvas-header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.canvas-tab-switcher {
  display: inline-flex;
  background: var(--bg-tertiary);
  padding: 2px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  gap: 2px;
}

.canvas-tab-btn {
  padding: 4px 12px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.76rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.canvas-tab-btn.active {
  background: var(--accent);
  color: #ffffff;
}

.canvas-modal-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: var(--bg-primary);
  overflow: hidden;
  position: relative;
}

.canvas-tab-pane {
  flex: 1;
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
}

.canvas-frame-container {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  background: #080a10;
  overflow: auto;
  box-sizing: border-box;
}

.canvas-frame-container iframe {
  width: 100%;
  height: 100%;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  background: #ffffff;
  transition: width 0.25s ease, height 0.25s ease;
  box-shadow: var(--shadow-lg);
}

/* Viewport sizes */
.canvas-frame-container[data-viewport="tablet"] iframe {
  width: 768px;
  max-width: 100%;
}

.canvas-frame-container[data-viewport="mobile"] iframe {
  width: 375px;
  max-width: 100%;
}

/* Mini Console */
.canvas-console {
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-card);
  max-height: 140px;
  min-height: 34px;
  display: flex;
  flex-direction: column;
}

.canvas-console-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 14px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-subtle);
  font-size: 0.74rem;
  color: var(--text-muted);
}

.console-count-badge {
  background: var(--bg-tertiary);
  padding: 1px 6px;
  border-radius: var(--radius-full);
  font-size: 0.68rem;
  margin-left: 4px;
}

.btn-clear-console {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 0.72rem;
  cursor: pointer;
}

.btn-clear-console:hover {
  color: var(--text-primary);
}

.canvas-console-logs {
  flex: 1;
  overflow-y: auto;
  padding: 6px 14px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  max-height: 105px;
}

.canvas-log-item {
  padding: 2px 0;
  line-height: 1.4;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.canvas-log-item.log-info { color: var(--text-secondary); }
.canvas-log-item.log-warn { color: #f59e0b; }
.canvas-log-item.log-error { color: var(--danger); }

/* Code Display Pane */
.canvas-code-display {
  flex: 1;
  margin: 0;
  padding: 20px;
  background: var(--bg-code-block);
  overflow: auto;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.6;
}

/* ==========================================================================
   LIVE INTERACTIVE DATA CHARTS (CHART.JS)
   ========================================================================== */

.chart-card {
  margin: 18px 0;
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.chart-card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-lg);
}

.chart-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-subtle);
  flex-wrap: wrap;
  gap: 10px;
}

.chart-header-left {
  display: flex;
  align-items: center;
  gap: 8px;
}

.chart-icon {
  font-size: 1.1rem;
}

.chart-title {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary);
}

.chart-badge {
  font-size: 0.68rem;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: var(--radius-full);
  background: var(--accent-gradient);
  color: #ffffff;
  letter-spacing: 0.04em;
}

.chart-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.chart-type-group {
  display: inline-flex;
  align-items: center;
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 2px;
  gap: 2px;
}

.btn-chart-type {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 0.72rem;
  font-weight: 500;
  padding: 3px 8px;
  border-radius: calc(var(--radius-sm) - 2px);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-chart-type:hover {
  color: var(--text-primary);
}

.btn-chart-type.active {
  background: var(--accent);
  color: #ffffff;
  font-weight: 600;
}

.btn-diagram-tool.btn-copy-chart,
.btn-diagram-tool.btn-export-chart-png {
  font-size: 0.74rem;
  padding: 4px 9px;
}

.chart-canvas-container {
  width: 100%;
  height: 340px;
  padding: 18px 20px 22px 20px;
  box-sizing: border-box;
  position: relative;
  background-color: var(--bg-card);
}

/* ==========================================================================
   INTERACTIVE FLASHCARDS (3D FLIP COMPANION)
   ========================================================================== */

.flashcard-deck-card {
  margin: 18px 0;
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.flashcard-deck-card:hover {
  border-color: var(--border-strong);
}

.flashcard-deck-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-subtle);
  flex-wrap: wrap;
  gap: 8px;
}

.deck-header-left {
  display: flex;
  align-items: center;
  gap: 8px;
}

.deck-icon {
  font-size: 1.15rem;
}

.deck-title {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary);
}

.deck-tag {
  font-size: 0.7rem;
  font-weight: 500;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background: var(--bg-tertiary);
  color: var(--accent-light);
  border: 1px solid var(--border-subtle);
}

.deck-header-right {
  display: flex;
  align-items: center;
  gap: 10px;
}

.deck-counter {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 500;
}

.deck-mastered-badge {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background: var(--bg-input);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  transition: all var(--transition-fast);
}

.deck-mastered-badge.active {
  background: rgba(16, 185, 129, 0.15);
  color: #10b981;
  border-color: rgba(16, 185, 129, 0.35);
}

.flashcard-progress-bar {
  width: 100%;
  height: 3px;
  background: var(--bg-tertiary);
  overflow: hidden;
}

.flashcard-progress-fill {
  height: 100%;
  background: var(--accent-gradient);
  transition: width 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 3D Flip Stage */
.flashcard-stage {
  perspective: 1200px;
  padding: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  outline: none;
  cursor: pointer;
  background: var(--bg-card);
}

.flashcard-card-3d {
  width: 100%;
  min-height: 220px;
  position: relative;
}

.flashcard-inner {
  width: 100%;
  height: 100%;
  min-height: 220px;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.flashcard-inner.flipped {
  transform: rotateY(180deg);
}

.flashcard-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: var(--radius-md);
  padding: 22px 26px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
  border: 1px solid var(--border-strong);
}

.flashcard-front {
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
}

.flashcard-back {
  background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--bg-card) 100%);
  transform: rotateY(180deg);
  border-color: var(--accent);
}

.face-top-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.face-badge {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 2px 8px;
  border-radius: 4px;
}

.prompt-badge {
  background: rgba(99, 102, 241, 0.15);
  color: var(--accent-light);
}

.answer-badge {
  background: rgba(16, 185, 129, 0.15);
  color: #10b981;
}

.flip-hint {
  font-size: 0.72rem;
  color: var(--text-muted);
}

.face-content {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-primary);
  margin: 12px 0;
  overflow-y: auto;
  max-height: 280px;
}

.face-content p {
  margin: 0.4em 0;
}

.face-bottom-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 14px;
}

.face-tag-pill {
  font-size: 0.72rem;
  color: var(--text-muted);
}

.mastered-indicator {
  font-size: 0.74rem;
  color: #10b981;
  font-weight: 600;
}

.flashcard-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  flex-wrap: wrap;
  gap: 10px;
}

.controls-left,
.controls-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn-deck-tool {
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.76rem;
  font-weight: 500;
  padding: 5px 11px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-deck-tool:hover:not(:disabled) {
  color: var(--text-primary);
  background: var(--bg-hover);
  border-color: var(--border-strong);
}

.btn-deck-tool:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn-deck-confidence {
  border: 1px solid var(--border-subtle);
  font-size: 0.76rem;
  font-weight: 600;
  padding: 5px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-mark-review {
  background: rgba(245, 158, 11, 0.1);
  color: #f59e0b;
  border-color: rgba(245, 158, 11, 0.25);
}

.btn-mark-review:hover {
  background: rgba(245, 158, 11, 0.2);
}

.btn-mark-mastered {
  background: rgba(16, 185, 129, 0.12);
  color: #10b981;
  border-color: rgba(16, 185, 129, 0.3);
}

.btn-mark-mastered:hover,
.btn-mark-mastered.is-mastered {
  background: rgba(16, 185, 129, 0.25);
  border-color: #10b981;
}

/* ==========================================================================
   INTERACTIVE QUIZ WIDGET
   ========================================================================== */

.quiz-container {
  margin: 18px 0;
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.quiz-container:hover {
  border-color: var(--border-strong);
}

.quiz-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 18px;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-subtle);
  flex-wrap: wrap;
  gap: 8px;
}

.quiz-header-left {
  display: flex;
  align-items: center;
  gap: 8px;
}

.quiz-icon {
  font-size: 1.15rem;
}

.quiz-title {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-primary);
}

.quiz-header-right {
  display: flex;
  align-items: center;
  gap: 10px;
}

.quiz-counter {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.quiz-score-pill {
  font-size: 0.74rem;
  font-weight: 600;
  padding: 3px 9px;
  border-radius: var(--radius-full);
  background: var(--bg-tertiary);
  color: var(--accent-light);
  border: 1px solid var(--border-subtle);
}

.quiz-progress-bar {
  width: 100%;
  height: 3px;
  background: var(--bg-tertiary);
  overflow: hidden;
}

.quiz-progress-fill {
  height: 100%;
  background: var(--accent-gradient);
  transition: width 0.35s ease;
}

.quiz-body {
  padding: 22px 20px;
}

.quiz-question-box {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.5;
  margin-bottom: 20px;
}

.quiz-question-box p {
  margin: 0.3em 0;
}

.quiz-options-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.quiz-option-btn {
  display: flex;
  align-items: center;
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-secondary);
  border: 1.5px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.92rem;
  text-align: left;
  cursor: pointer;
  transition: all var(--transition-fast);
  gap: 12px;
}

.quiz-option-btn:hover:not(.disabled) {
  border-color: var(--accent);
  background: var(--bg-hover);
  transform: translateX(3px);
}

.option-letter {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: var(--radius-full);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-strong);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-secondary);
  flex-shrink: 0;
}

.option-content {
  flex: 1;
  line-height: 1.4;
}

.option-content p {
  margin: 0;
}

.option-status-icon {
  font-size: 1.1rem;
  font-weight: 700;
  flex-shrink: 0;
}

.quiz-option-btn.disabled {
  cursor: default;
  pointer-events: none;
}

.quiz-option-btn.quiz-option-correct {
  background: rgba(16, 185, 129, 0.15);
  border-color: #10b981;
  color: #10b981;
}

.quiz-option-btn.quiz-option-correct .option-letter {
  background: #10b981;
  color: #ffffff;
  border-color: #10b981;
}

.quiz-option-btn.quiz-option-wrong {
  background: rgba(244, 63, 94, 0.15);
  border-color: #f43f5e;
  color: #f43f5e;
}

.quiz-option-btn.quiz-option-wrong .option-letter {
  background: #f43f5e;
  color: #ffffff;
  border-color: #f43f5e;
}

.quiz-explanation-box {
  margin-top: 18px;
  padding: 14px 18px;
  background: rgba(99, 102, 241, 0.08);
  border: 1px solid rgba(99, 102, 241, 0.25);
  border-radius: var(--radius-md);
  animation: slideUp 0.2s ease-out;
}

.explanation-title {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--accent-light);
  margin-bottom: 6px;
}

.explanation-content {
  font-size: 0.88rem;
  line-height: 1.5;
  color: var(--text-primary);
}

.explanation-content p {
  margin: 0.3em 0;
}

.quiz-footer {
  padding: 12px 20px;
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  display: flex;
  justify-content: flex-end;
}

.btn-quiz-next {
  background: var(--accent-gradient);
  border: none;
  color: #ffffff;
  font-size: 0.84rem;
  font-weight: 600;
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.btn-quiz-next:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

.quiz-completion-banner {
  padding: 40px 24px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  animation: zoomIn 0.3s ease-out;
}

.quiz-trophy-icon {
  font-size: 50px;
  line-height: 1;
}

.quiz-completion-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

.quiz-final-score {
  display: flex;
  align-items: baseline;
  gap: 6px;
  font-family: var(--font-mono);
  margin: 4px 0;
}

.score-large {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--accent-light);
}

.score-divider,
.score-total {
  font-size: 1.3rem;
  color: var(--text-muted);
}

.score-pct {
  font-size: 1.05rem;
  font-weight: 600;
  color: #10b981;
  margin-left: 6px;
}

.quiz-completion-msg {
  font-size: 0.9rem;
  color: var(--text-secondary);
  max-width: 420px;
  line-height: 1.5;
  margin: 0 0 12px 0;
}

.btn-retake-quiz {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-strong);
  color: var(--text-primary);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-retake-quiz:hover {
  background: var(--bg-hover);
  border-color: var(--accent);
}

/* ==========================================================================
   PYTHON WASM SANDBOX (PYODIDE RUNNER)
   ========================================================================== */

.btn-run-python {
  color: #38bdf8;
  border-color: rgba(56, 189, 248, 0.35);
  background: rgba(56, 189, 248, 0.08);
}

.btn-run-python:hover {
  background: rgba(56, 189, 248, 0.18);
  border-color: #38bdf8;
  color: #ffffff;
}

.python-sandbox-output {
  margin-top: -6px;
  margin-bottom: 12px;
  border: 1px solid var(--border-strong);
  border-top: none;
  border-bottom-left-radius: var(--radius-md);
  border-bottom-right-radius: var(--radius-md);
  background: var(--bg-secondary);
  overflow: hidden;
  animation: slideUp 0.2s ease-out;
}

.py-output-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 14px;
  background: var(--bg-tertiary);
  border-bottom: 1px solid var(--border-subtle);
  font-size: 0.74rem;
}

.py-header-left {
  display: flex;
  align-items: center;
  gap: 8px;
}

.py-icon {
  font-size: 0.9rem;
}

.py-title {
  font-weight: 600;
  color: var(--text-secondary);
}

.py-status-badge {
  font-size: 0.68rem;
  font-weight: 600;
  padding: 2px 7px;
  border-radius: var(--radius-full);
}

.py-status-running {
  background: rgba(245, 158, 11, 0.15);
  color: #f59e0b;
}

.py-status-success {
  background: rgba(16, 185, 129, 0.15);
  color: #10b981;
}

.py-status-error {
  background: rgba(244, 63, 94, 0.15);
  color: #f43f5e;
}

.py-header-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

.btn-clear-py-output,
.btn-close-py-output {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 0.72rem;
  cursor: pointer;
  padding: 2px 6px;
  border-radius: 3px;
  transition: all var(--transition-fast);
}

.btn-clear-py-output:hover,
.btn-close-py-output:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
}

.py-terminal-pre {
  margin: 0;
  padding: 12px 16px;
  background: #06090e;
  overflow-x: auto;
  max-height: 220px;
}

.py-terminal-code {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.5;
  color: #a5f3fc;
  white-space: pre-wrap;
  word-break: break-word;
}

/* ==========================================================================
   C++ / C RUNNER (GCC NATIVE RUNNER)
   ========================================================================== */

.btn-run-cpp {
  color: #60a5fa;
  border-color: rgba(96, 165, 250, 0.35);
  background: rgba(96, 165, 250, 0.08);
}

.btn-run-cpp:hover {
  background: rgba(96, 165, 250, 0.18);
  border-color: #60a5fa;
  color: #ffffff;
}

.btn-toggle-stdin {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.72rem;
  padding: 2px 7px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-toggle-stdin:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
  border-color: var(--border-strong);
}

.cpp-stdin-drawer {
  padding: 8px 14px;
  background: var(--bg-tertiary);
  border-bottom: 1px solid var(--border-subtle);
  animation: slideUp 0.15s ease-out;
}

.stdin-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.btn-run-with-stdin {
  background: var(--accent);
  color: #ffffff;
  border: none;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: opacity var(--transition-fast);
}

.btn-run-with-stdin:hover {
  opacity: 0.9;
}

.cpp-stdin-input {
  width: 100%;
  box-sizing: border-box;
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  padding: 6px 10px;
  resize: vertical;
}

.cpp-stdin-input:focus {
  outline: none;
  border-color: var(--accent);
}

.sidebar-creator-credit {
  padding: 10px 14px 4px 14px;
  font-size: 0.72rem;
  color: var(--text-muted);
  text-align: center;
  border-top: 1px solid var(--border-subtle);
  margin-top: 6px;
  letter-spacing: 0.01em;
}

.sidebar-creator-credit strong {
  color: var(--accent-light);
  font-weight: 600;
}

/* ==========================================================================
   UNIVERSAL "FIX WITH XAREN" AUTOMATED DEBUGGING ENGINE STYLES
   ========================================================================== */

.btn-fix-with-xaren,
.btn-fix-with-nova {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--accent-gradient);
  color: #ffffff;
  border: none;
  border-radius: var(--radius-full);
  padding: 4px 11px;
  font-size: 0.72rem;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 2px 8px var(--accent-glow);
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  overflow: hidden;
  user-select: none;
  animation: xarenFixPulse 2.8s infinite;
}

[data-theme="paper"] .btn-fix-with-xaren,
[data-theme="paper"] .btn-fix-with-nova {
  color: #ffffff;
}

@keyframes xarenFixPulse {
  0%, 100% {
    box-shadow: 0 0 0 0 var(--accent-glow);
  }
  50% {
    box-shadow: 0 0 12px 2px var(--accent-glow);
  }
}

@keyframes novaFixPulse {
  0%, 100% {
    box-shadow: 0 0 0 0 var(--accent-glow);
  }
  50% {
    box-shadow: 0 0 12px 2px var(--accent-glow);
  }
}

.btn-fix-with-xaren:hover:not(:disabled),
.btn-fix-with-nova:hover:not(:disabled) {
  transform: translateY(-1px) scale(1.02);
  filter: brightness(1.12);
}

.btn-fix-with-xaren:active:not(:disabled),
.btn-fix-with-nova:active:not(:disabled) {
  transform: translateY(0) scale(0.98);
}

.btn-fix-with-xaren:disabled,
.btn-fix-with-xaren.is-fixing,
.btn-fix-with-nova:disabled,
.btn-fix-with-nova.is-fixing {
  opacity: 0.75;
  cursor: wait;
  animation: none;
}

.btn-fix-with-xaren.is-fixing .btn-fix-spark,
.btn-fix-with-nova.is-fixing .btn-fix-spark {
  display: inline-block;
  animation: xarenSpin 1s linear infinite;
}

@keyframes xarenSpin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes novaSpin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.canvas-console-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Inline Fix button inside error console entries */
.btn-log-fix-inline {
  background: rgba(239, 68, 68, 0.15);
  color: #f87171;
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-radius: var(--radius-sm);
  padding: 1px 7px;
  font-size: 0.68rem;
  font-weight: 600;
  cursor: pointer;
  margin-left: 8px;
  transition: all 0.15s ease;
  vertical-align: middle;
}

.btn-log-fix-inline:hover {
  background: var(--accent);
  color: #ffffff;
  border-color: var(--accent);
}

/* Hot-Patch Notification Banner */
.xaren-hotpatch-banner,
.nova-hotpatch-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.12), rgba(139, 92, 246, 0.12));
  border: 1px solid rgba(16, 185, 129, 0.35);
  border-radius: var(--radius-md);
  padding: 8px 14px;
  margin: 10px 14px;
  font-size: 0.78rem;
  color: var(--text-primary);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
  animation: slideDownFade 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes slideDownFade {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hotpatch-banner-left {
  display: flex;
  align-items: center;
  gap: 10px;
  overflow: hidden;
}

.hotpatch-badge {
  background: var(--success);
  color: #ffffff;
  font-weight: 700;
  font-size: 0.68rem;
  padding: 2px 7px;
  border-radius: var(--radius-full);
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.hotpatch-summary {
  font-weight: 500;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.hotpatch-banner-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
  margin-left: 12px;
}

.btn-hotpatch-info {
  background: transparent;
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  padding: 2px 8px;
  font-size: 0.7rem;
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-hotpatch-info:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--accent);
}

.btn-hotpatch-undo {
  background: rgba(239, 68, 68, 0.12);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #f87171;
  border-radius: var(--radius-sm);
  padding: 2px 8px;
  font-size: 0.7rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-hotpatch-undo:hover {
  background: var(--danger);
  color: #ffffff;
  border-color: var(--danger);
}

.btn-hotpatch-dismiss {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 0.82rem;
  cursor: pointer;
  padding: 2px 4px;
  line-height: 1;
}

.btn-hotpatch-dismiss:hover {
  color: var(--text-primary);
}

/* Call-to-action error bar inside runner terminals */
.sandbox-error-action-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 12px;
  margin: 10px 0 4px 0;
  background: rgba(239, 68, 68, 0.08);
  border: 1px solid rgba(239, 68, 68, 0.25);
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
}

.sandbox-error-hint {
  font-size: 0.72rem;
  color: var(--text-secondary);
  line-height: 1.3;
}

/* ==========================================================================
   XarenChat v2: Model Cycling & Custom API Keys Modal
   ========================================================================== */

.v2-badge {
  display: inline-block;
  background: linear-gradient(135deg, #38bdf8 0%, #818cf8 100%);
  color: #ffffff;
  font-size: 0.65rem;
  font-weight: 700;
  padding: 1px 7px;
  border-radius: 9999px;
  vertical-align: middle;
  margin-left: 6px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  box-shadow: 0 0 10px rgba(56, 189, 248, 0.4);
}

.model-select-wrapper {
  display: flex;
  align-items: center;
  gap: 6px;
}

.btn-cycle-model {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 6px 10px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn-cycle-model:hover {
  background: var(--bg-hover);
  border-color: var(--border-focus);
  color: var(--accent);
  transform: translateY(-1px);
}

.btn-cycle-model:active {
  transform: scale(0.97);
}

.btn-cycle-model .cycle-icon {
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.btn-cycle-model.cycling .cycle-icon {
  transform: rotate(180deg);
}

.top-api-keys-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
}

.top-api-keys-btn:hover {
  background: var(--bg-hover);
  border-color: var(--border-focus);
  color: var(--accent);
}

.key-status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #64748b;
  transition: background var(--transition-fast), box-shadow var(--transition-fast);
}

.key-status-dot.active {
  background: #10b981;
  box-shadow: 0 0 8px rgba(16, 185, 129, 0.6);
}

/* API Keys Modal */
.api-keys-modal-card {
  max-width: 540px;
  width: 90vw;
}

.api-key-group {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px;
  margin-bottom: 14px;
}

.api-key-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 6px;
}

.api-provider-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  color: var(--text-primary);
}

.provider-icon-badge {
  font-size: 1.1rem;
}

.get-key-link {
  font-size: 0.75rem;
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
  transition: opacity var(--transition-fast);
}

.get-key-link:hover {
  text-decoration: underline;
}

.api-key-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 10px;
  line-height: 1.4;
}

.api-input-wrap {
  display: flex;
  align-items: center;
  position: relative;
}

.api-key-input {
  width: 100%;
  padding: 9px 36px 9px 12px;
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  outline: none;
  transition: border-color var(--transition-fast);
}

.api-key-input:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 2px var(--accent-glow);
}

.btn-toggle-key-visibility {
  position: absolute;
  right: 8px;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 0.95rem;
  padding: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.api-key-status {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 8px;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.api-key-status .status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #64748b;
}

.api-key-status .status-dot.active {
  background: #10b981;
  box-shadow: 0 0 6px rgba(16, 185, 129, 0.5);
}

.api-key-status .status-dot.active.free {
  background: #38bdf8;
  box-shadow: 0 0 6px rgba(56, 189, 248, 0.5);
}

.api-keys-notice {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 10px 12px;
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.2);
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

.api-keys-notice svg {
  flex-shrink: 0;
  margin-top: 2px;
  color: #38bdf8;
}

/* Custom / Any API Provider Styling */
.custom-provider-group {
  border: 1px solid var(--border-subtle);
  background: var(--bg-surface-elevated, rgba(255, 255, 255, 0.02));
  padding: 14px;
  border-radius: var(--radius-md);
  margin-bottom: 16px;
}

.provider-icon-badge.custom-badge {
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.2), rgba(239, 68, 68, 0.2));
  border: 1px solid rgba(245, 158, 11, 0.4);
  color: #f59e0b;
}

.custom-toggle-label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  user-select: none;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--bg-surface, rgba(255, 255, 255, 0.05));
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--border-subtle);
  transition: all var(--transition-fast);
}

.custom-toggle-label:hover {
  border-color: var(--border-focus);
  color: var(--text-primary);
}

.custom-toggle-checkbox {
  accent-color: var(--accent-primary, #6366f1);
  cursor: pointer;
  width: 14px;
  height: 14px;
}

.preset-pills-bar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  margin: 10px 0 12px 0;
}

.preset-label {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  margin-right: 2px;
}

.btn-preset-pill {
  background: var(--bg-surface, rgba(255, 255, 255, 0.04));
  border: 1px solid var(--border-subtle);
  border-radius: 999px;
  color: var(--text-secondary);
  font-size: 0.75rem;
  font-weight: 500;
  padding: 3px 10px;
  cursor: pointer;
  transition: all var(--transition-fast);
  outline: none;
}

.btn-preset-pill:hover {
  background: var(--bg-hover, rgba(255, 255, 255, 0.1));
  border-color: var(--border-focus);
  color: var(--text-primary);
  transform: translateY(-1px);
}

.custom-fields-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-bottom: 12px;
}

@media (max-width: 600px) {
  .custom-fields-grid {
    grid-template-columns: 1fr;
  }
}

.field-wrap {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.field-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
}

.custom-actions-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px dashed var(--border-subtle);
}

.btn-test-api {
  padding: 6px 12px;
  font-size: 0.78rem;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-test-api:hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
}