:root,
[data-theme="obsidian-dark"] {
  --theme-id: 'obsidian-dark';
  --theme-name: 'Obsidian Cyber';
  --bg-primary: #070b14;
  --bg-secondary: #0b1120;
  --bg-card: #0f172a;
  --bg-card-hover: #1e293b;
  --bg-accent-subtle: rgba(6, 182, 212, 0.08);

  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  --primary: #38bdf8;
  --primary-glow: rgba(56, 189, 248, 0.35);
  --primary-hover: #0ea5e9;

  --accent-cyan: #06b6d4;
  --accent-purple: #8b5cf6;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  --accent-rose: #f43f5e;

  --border-color: rgba(255, 255, 255, 0.08);
  --border-light: rgba(255, 255, 255, 0.14);

  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-display: 'Outfit', 'Inter', system-ui, sans-serif;
  --font-mono: 'Fira Code', monospace;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.5);
  --shadow-md: 0 4px 14px rgba(0, 0, 0, 0.6);
  --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.75);
  --shadow-glow: 0 0 25px rgba(6, 182, 212, 0.25);

  --header-height: 88px;
  --sticky-offset: calc(var(--header-height) + 0.75rem);

  /* Glassmorphism Design Tokens */
  --glass-bg: rgba(11, 17, 32, 0.82);
  --glass-border: 1px solid rgba(255, 255, 255, 0.1);
  --glass-border-cyan: 1px solid rgba(0, 243, 255, 0.3);
  --glass-blur: blur(14px);
  --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.55), inset 0 1px 1px 0 rgba(255, 255, 255, 0.08);
  --glass-shadow-glow: 0 8px 32px 0 rgba(0, 0, 0, 0.75), 0 0 25px rgba(0, 243, 255, 0.18), inset 0 1px 1px 0 rgba(255, 255, 255, 0.2);

  --brand-gradient: linear-gradient(90deg, #60a5fa, #a78bfa);
  --bg-ambient-1: rgba(139, 92, 246, 0.08);
  --bg-ambient-2: rgba(6, 182, 212, 0.08);
  --code-bg: #090d16;
  --input-bg: rgba(15, 23, 42, 0.75);
  --input-border: rgba(255, 255, 255, 0.12);
  --input-text: #f8fafc;
  --badge-bg: rgba(6, 182, 212, 0.12);
  --badge-border: rgba(6, 182, 212, 0.3);
}

/* ☀️ Slate Studio (Crisp Modern Light) */
[data-theme="slate-light"] {
  --theme-id: 'slate-light';
  --theme-name: 'Slate Studio';
  --bg-primary: #f8fafc;
  --bg-secondary: #f1f5f9;
  --bg-card: #ffffff;
  --bg-card-hover: #f8fafc;
  --bg-accent-subtle: rgba(2, 132, 199, 0.08);

  --text-main: #0f172a;
  --text-muted: #475569;
  --text-dim: #94a3b8;

  --primary: #2563eb;
  --primary-glow: rgba(37, 99, 235, 0.2);
  --primary-hover: #1d4ed8;

  --accent-cyan: #0284c7;
  --accent-purple: #7c3aed;
  --accent-emerald: #059669;
  --accent-amber: #d97706;
  --accent-rose: #e11d48;

  --border-color: rgba(15, 23, 42, 0.09);
  --border-light: rgba(15, 23, 42, 0.15);

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 14px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.1);
  --shadow-glow: 0 0 20px rgba(37, 99, 235, 0.15);

  --glass-bg: rgba(255, 255, 255, 0.88);
  --glass-border: 1px solid rgba(15, 23, 42, 0.1);
  --glass-border-cyan: 1px solid rgba(2, 132, 199, 0.3);
  --glass-blur: blur(14px);
  --glass-shadow: 0 4px 20px 0 rgba(0, 0, 0, 0.06), inset 0 1px 1px 0 rgba(255, 255, 255, 0.9);
  --glass-shadow-glow: 0 8px 30px 0 rgba(0, 0, 0, 0.08), 0 0 20px rgba(37, 99, 235, 0.12);

  --brand-gradient: linear-gradient(90deg, #2563eb, #7c3aed);
  --bg-ambient-1: rgba(99, 102, 241, 0.04);
  --bg-ambient-2: rgba(2, 132, 199, 0.04);
  --code-bg: #f1f5f9;
  --input-bg: #ffffff;
  --input-border: rgba(15, 23, 42, 0.18);
  --input-text: #0f172a;
  --badge-bg: rgba(37, 99, 235, 0.1);
  --badge-border: rgba(37, 99, 235, 0.25);
}

/* 🌲 Alpine Nord (Muted Polar Dark) */
[data-theme="alpine-nord"] {
  --theme-id: 'alpine-nord';
  --theme-name: 'Alpine Nord';
  --bg-primary: #242933;
  --bg-secondary: #2e3440;
  --bg-card: #3b4252;
  --bg-card-hover: #434c5e;
  --bg-accent-subtle: rgba(136, 192, 208, 0.1);

  --text-main: #eceff4;
  --text-muted: #d8dee9;
  --text-dim: #9aa5b8;

  --primary: #88c0d0;
  --primary-glow: rgba(136, 192, 208, 0.35);
  --primary-hover: #81a1c1;

  --accent-cyan: #8fbcbb;
  --accent-purple: #b48ead;
  --accent-emerald: #a3be8c;
  --accent-amber: #ebcb8b;
  --accent-rose: #bf616a;

  --border-color: rgba(236, 239, 244, 0.1);
  --border-light: rgba(236, 239, 244, 0.18);

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 14px rgba(0, 0, 0, 0.38);
  --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.45);
  --shadow-glow: 0 0 25px rgba(136, 192, 208, 0.2);

  --glass-bg: rgba(46, 52, 64, 0.88);
  --glass-border: 1px solid rgba(236, 239, 244, 0.12);
  --glass-border-cyan: 1px solid rgba(136, 192, 208, 0.35);
  --glass-blur: blur(14px);
  --glass-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
  --glass-shadow-glow: 0 8px 30px rgba(0, 0, 0, 0.5), 0 0 20px rgba(136, 192, 208, 0.2);

  --brand-gradient: linear-gradient(90deg, #88c0d0, #b48ead);
  --bg-ambient-1: rgba(136, 192, 208, 0.08);
  --bg-ambient-2: rgba(163, 190, 140, 0.08);
  --code-bg: #1e222a;
  --input-bg: rgba(46, 52, 64, 0.8);
  --input-border: rgba(236, 239, 244, 0.16);
  --input-text: #eceff4;
  --badge-bg: rgba(136, 192, 208, 0.14);
  --badge-border: rgba(136, 192, 208, 0.3);
}

/* ☕ Warm Paper / Sepia (Soft Minimalist Light) */
[data-theme="warm-sepia"] {
  --theme-id: 'warm-sepia';
  --theme-name: 'Warm Sepia';
  --bg-primary: #fbf8f2;
  --bg-secondary: #f3ede2;
  --bg-card: #ffffff;
  --bg-card-hover: #f7f3ec;
  --bg-accent-subtle: rgba(194, 94, 0, 0.08);

  --text-main: #2d2b28;
  --text-muted: #6b645b;
  --text-dim: #9c9489;

  --primary: #c25e00;
  --primary-glow: rgba(194, 94, 0, 0.2);
  --primary-hover: #9e4b00;

  --accent-cyan: #0d828a;
  --accent-purple: #834b8c;
  --accent-emerald: #2d8a4e;
  --accent-amber: #c25e00;
  --accent-rose: #c7384e;

  --border-color: rgba(60, 50, 40, 0.1);
  --border-light: rgba(60, 50, 40, 0.18);

  --shadow-sm: 0 1px 3px rgba(70, 55, 40, 0.05);
  --shadow-md: 0 4px 14px rgba(70, 55, 40, 0.07);
  --shadow-lg: 0 10px 30px rgba(70, 55, 40, 0.1);
  --shadow-glow: 0 0 20px rgba(194, 94, 0, 0.15);

  --glass-bg: rgba(251, 248, 242, 0.92);
  --glass-border: 1px solid rgba(60, 50, 40, 0.12);
  --glass-border-cyan: 1px solid rgba(13, 130, 138, 0.35);
  --glass-blur: blur(14px);
  --glass-shadow: 0 4px 20px rgba(70, 55, 40, 0.06);
  --glass-shadow-glow: 0 8px 30px rgba(70, 55, 40, 0.08), 0 0 20px rgba(194, 94, 0, 0.15);

  --brand-gradient: linear-gradient(90deg, #c25e00, #834b8c);
  --bg-ambient-1: rgba(194, 94, 0, 0.04);
  --bg-ambient-2: rgba(13, 130, 138, 0.04);
  --code-bg: #eee7dc;
  --input-bg: #ffffff;
  --input-border: rgba(60, 50, 40, 0.18);
  --input-text: #2d2b28;
  --badge-bg: rgba(194, 94, 0, 0.1);
  --badge-border: rgba(194, 94, 0, 0.25);
}

/* 🌆 Tokyo Midnight (Vibrant Neon Dark) */
[data-theme="tokyo-midnight"] {
  --theme-id: 'tokyo-midnight';
  --theme-name: 'Tokyo Midnight';
  --bg-primary: #0c0a17;
  --bg-secondary: #130f24;
  --bg-card: #191430;
  --bg-card-hover: #221b42;
  --bg-accent-subtle: rgba(236, 72, 153, 0.1);

  --text-main: #f5f3ff;
  --text-muted: #c4b5fd;
  --text-dim: #8b7cb6;

  --primary: #ec4899;
  --primary-glow: rgba(236, 72, 153, 0.4);
  --primary-hover: #db2777;

  --accent-cyan: #00e5ff;
  --accent-purple: #a855f7;
  --accent-emerald: #10b981;
  --accent-amber: #fbbf24;
  --accent-rose: #f43f5e;

  --border-color: rgba(168, 85, 247, 0.16);
  --border-light: rgba(236, 72, 153, 0.25);

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.5);
  --shadow-md: 0 4px 14px rgba(0, 0, 0, 0.6);
  --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.75);
  --shadow-glow: 0 0 25px rgba(236, 72, 153, 0.3);

  --glass-bg: rgba(19, 15, 36, 0.85);
  --glass-border: 1px solid rgba(168, 85, 247, 0.22);
  --glass-border-cyan: 1px solid rgba(0, 229, 255, 0.35);
  --glass-blur: blur(14px);
  --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.6), 0 0 20px rgba(168, 85, 247, 0.15);
  --glass-shadow-glow: 0 8px 32px 0 rgba(0, 0, 0, 0.75), 0 0 25px rgba(236, 72, 153, 0.3);

  --brand-gradient: linear-gradient(90deg, #ec4899, #a855f7, #00e5ff);
  --bg-ambient-1: rgba(236, 72, 153, 0.08);
  --bg-ambient-2: rgba(168, 85, 247, 0.08);
  --code-bg: #110d21;
  --input-bg: rgba(25, 20, 48, 0.8);
  --input-border: rgba(168, 85, 247, 0.25);
  --input-text: #f5f3ff;
  --badge-bg: rgba(236, 72, 153, 0.14);
  --badge-border: rgba(236, 72, 153, 0.3);
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  background-image:
    radial-gradient(circle at 15% 15%, var(--bg-ambient-1) 0%, transparent 45%),
    radial-gradient(circle at 85% 85%, var(--bg-ambient-2) 0%, transparent 45%);
  background-attachment: fixed;
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  transition: background-color 0.2s ease, color 0.2s ease;
}

/* Typography Enhancements & Optical Kerning */
h1, h2, h3, h4, h5, h6, .app-title, .banner-title, .section-title {
  text-wrap: balance;
  letter-spacing: -0.025em;
}

p, .section-desc, .def-two-liner, .recap-topic-body, .sim-desc {
  text-wrap: pretty;
}

/* Mouse Spotlight Card Glow (Linear/Vercel Liquid Glass Sheen) */
.spotlight-card,
.domain-card,
.sim-card,
.track-pill-card,
.pathway-stepper-card,
.recap-topic-card,
.recap-section-header {
  position: relative;
  overflow: hidden;
}

.spotlight-card::before,
.domain-card::before,
.sim-card::before,
.track-pill-card::before,
.pathway-stepper-card::before,
.recap-topic-card::before,
.recap-section-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  border-radius: inherit;
  background: radial-gradient(420px circle at var(--mouse-x, 50%) var(--mouse-y, 50%), var(--primary-glow), transparent 65%);
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
  z-index: 1;
}

.spotlight-card:hover::before,
.domain-card:hover::before,
.sim-card:hover::before,
.track-pill-card:hover::before,
.pathway-stepper-card:hover::before,
.recap-topic-card:hover::before,
.recap-section-header:hover::before {
  opacity: 1;
}

.domain-card > *,
.sim-card > *,
.track-pill-card > *,
.pathway-stepper-card > *,
.recap-topic-card > *,
.recap-section-header > * {
  position: relative;
  z-index: 2;
}

/* Base Hyperlinks & Navigation Links */
a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.2s ease, text-shadow 0.2s ease, background 0.2s ease;
}

a:visited {
  color: var(--primary);
}

a:hover {
  color: var(--accent-cyan);
  text-shadow: 0 0 10px var(--primary-glow);
}

a:focus-visible {
  outline: 2px solid var(--accent-cyan);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* Global App Container */
.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  transition: margin-right 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.app-container.ai-panel-open {
  margin-right: 460px;
}

.app-container.ai-panel-open.wide-mode {
  margin-right: 680px;
}

/* Header */
.global-header {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: var(--glass-border);
  box-shadow: var(--glass-shadow);
  padding: 1rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
  gap: 1.5rem;
}

.header-left-group {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.mobile-menu-toggle-btn {
  display: none;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  color: var(--text-main);
  font-size: 1.3rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.mobile-menu-toggle-btn:hover {
  background: rgba(6, 182, 212, 0.15);
  border-color: var(--accent-cyan);
  color: #fff;
}

.brand-section {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.brand-titles {
  display: flex;
  flex-direction: column;
}

.logo-icon {
  font-size: 1.8rem;
  background: linear-gradient(135deg, var(--bg-card), var(--border-light));
  padding: 0.4rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
}

.app-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  background: linear-gradient(90deg, #60a5fa, #a78bfa);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

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

.gnav-mobile-close-btn {
  display: none;
}

.sidebar-backdrop {
  display: none;
}

.recap-tree-mobile-bar {
  display: none;
}

/* Breadcrumb Navigation */
.breadcrumb-tracker {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  background-color: var(--bg-card);
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.breadcrumb-tracker .crumb {
  color: var(--text-muted);
  cursor: pointer;
  transition: color 0.2s;
  display: inline-flex;
  align-items: center;
}

.breadcrumb-tracker .crumb:hover {
  color: var(--text-main);
}

.breadcrumb-tracker .crumb.active {
  color: var(--primary);
  font-weight: 600;
}

.breadcrumb-tracker .crumb-sep {
  color: var(--text-dim);
}

.header-actions {
  display: flex;
  gap: 0.6rem;
  align-items: center;
}

/* Header Nav Action Buttons - Icon Only with Hover Text Expansion */
.header-actions .btn.nav-btn-icon {
  padding: 0.45rem 0.7rem;
  overflow: hidden;
  white-space: nowrap;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  display: inline-flex;
  align-items: center;
  gap: 0;
  border-radius: 20px;
}

.header-actions .btn.nav-btn-icon .nav-icon {
  font-size: 1.05rem;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.header-actions .btn.nav-btn-icon .nav-text {
  max-width: 0;
  opacity: 0;
  overflow: hidden;
  display: inline-block;
  white-space: nowrap;
  transition: max-width 0.35s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.25s ease, margin 0.25s ease;
  margin-left: 0;
  font-size: 0.82rem;
}

.header-actions .btn.nav-btn-icon:hover .nav-text,
.header-actions .btn.nav-btn-icon:focus-visible .nav-text {
  max-width: 260px;
  opacity: 1;
  margin-left: 0.45rem;
}

/* Theme Switcher Header Dropdown */
.theme-switcher-container {
  position: relative;
  display: inline-flex;
}

.theme-toggle-btn {
  border-color: var(--border-light);
  background: var(--bg-card);
}

.theme-toggle-btn:hover {
  border-color: var(--primary);
  box-shadow: 0 0 12px var(--primary-glow);
}

@keyframes slideDownTheme {
  from {
    opacity: 0;
    transform: translateY(-6px) scale(0.97);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.theme-dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  width: 290px;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--glass-shadow-glow);
  padding: 0.85rem;
  display: none;
  flex-direction: column;
  gap: 0.35rem;
  z-index: 1050;
}

.theme-dropdown-menu.show {
  display: flex;
  animation: slideDownTheme 0.18s cubic-bezier(0.16, 1, 0.3, 1);
}

.theme-dropdown-header {
  padding: 0.2rem 0.4rem 0.55rem 0.4rem;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 0.35rem;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.theme-dropdown-title {
  font-family: var(--font-display);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.theme-dropdown-sub {
  font-size: 0.68rem;
  color: var(--text-muted);
}

.theme-options-list {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.theme-option-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.55rem 0.75rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-main);
  cursor: pointer;
  text-align: left;
  transition: all 0.18s ease;
  width: 100%;
  box-sizing: border-box;
}

.theme-option-item:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-color);
  transform: translateX(2px);
}

.theme-option-item.active {
  background: var(--bg-accent-subtle);
  border-color: var(--primary);
  box-shadow: 0 0 10px var(--primary-glow);
}

.theme-swatch {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  flex-shrink: 0;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.25);
  border: 1.5px solid var(--border-light);
}

.theme-option-info {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-width: 0;
}

.theme-option-name {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-main);
  line-height: 1.2;
}

.theme-option-type {
  font-size: 0.68rem;
  color: var(--text-muted);
  margin-top: 2px;
}

.theme-check {
  font-size: 0.9rem;
  color: var(--primary);
  font-weight: 800;
  opacity: 0;
  transition: opacity 0.15s ease;
}

.theme-option-item.active .theme-check {
  opacity: 1;
}

/* Mobile Sidebar Theme Selector */
.gnav-theme-section {
  padding: 1rem 0.85rem 0.5rem 0.85rem;
  border-top: 1px solid var(--border-color);
  margin-top: auto;
}

.gnav-theme-title {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 0.55rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.gnav-theme-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.35rem;
}

.gnav-theme-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.2rem;
  padding: 0.45rem 0.2rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  cursor: pointer;
  color: var(--text-main);
  transition: all 0.2s;
}

.gnav-theme-btn .gnav-theme-icon {
  font-size: 1.1rem;
}

.gnav-theme-btn:hover {
  border-color: var(--primary);
  background: var(--bg-card-hover);
}

.gnav-theme-btn.active {
  border-color: var(--primary);
  background: var(--bg-accent-subtle);
  box-shadow: 0 0 8px var(--primary-glow);
}

/* Buttons */
.btn {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  border: none;
  text-decoration: none;
}

.btn-primary {
  background-color: var(--primary);
  color: #fff;
  box-shadow: 0 2px 8px var(--primary-glow);
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  transform: translateY(-1px);
}

.btn-outline {
  background-color: transparent;
  color: var(--text-main);
  border: 1px solid var(--border-light);
}

.btn-outline:hover {
  background-color: var(--bg-card-hover);
  border-color: var(--primary);
}

.btn-accent {
  background-color: var(--accent-purple);
  color: #fff;
}

.btn-accent:hover {
  filter: brightness(1.1);
}

.btn-sm {
  padding: 0.35rem 0.75rem;
  font-size: 0.78rem;
}

/* Main Content Area */
.main-content {
  flex: 1;
  max-width: 1400px;
  margin: 0 auto;
  width: 100%;
  padding: 2rem;
}

.section-badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--accent-cyan);
  background-color: rgba(6, 182, 212, 0.1);
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  border: 1px solid rgba(6, 182, 212, 0.25);
  margin-bottom: 0.5rem;
}

/* Sticky Subheader Career Progression Track Navigator */
.tracks-sticky-bar {
  position: sticky;
  top: calc(var(--header-height, 88px) + 0.5rem);
  z-index: 85;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 0.75rem 1rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--glass-shadow);
  transition: all 0.25s ease;
}

.tracks-bar-inner {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.tracks-bar-label {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--primary);
  white-space: nowrap;
  padding-right: 0.85rem;
  border-right: 1px solid var(--border-color);
}

.tracks-grid-rail {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.65rem;
  flex: 1;
}

.track-pill-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.55rem 0.85rem;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  align-items: center;
  gap: 0.65rem;
  user-select: none;
  min-height: 54px;
}

.track-pill-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--primary);
  transform: translateY(-1px);
}

.track-pill-card.active {
  background: var(--bg-accent-subtle);
  border-color: var(--primary);
  box-shadow: 0 0 14px var(--primary-glow);
}

.track-pill-icon {
  font-size: 1.25rem;
  background: var(--bg-secondary);
  border-radius: 8px;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.track-pill-card.active .track-pill-icon {
  background: var(--bg-accent-subtle);
  box-shadow: 0 0 10px var(--primary-glow);
}

.track-pill-body {
  display: flex;
  flex-direction: column;
  min-width: 0;
  flex: 1;
}

.track-pill-title {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.35rem;
}

.track-pill-badge {
  font-size: 0.65rem;
  font-weight: 600;
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
  background: var(--bg-secondary);
  color: var(--text-muted);
}

.track-pill-card.active .track-pill-badge {
  background: var(--badge-bg);
  color: var(--primary);
  border: 1px solid var(--badge-border);
}

.track-pill-sub {
  font-size: 0.7rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-top: 1px;
}

@media (max-width: 1100px) {
  .tracks-grid-rail {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 680px) {
  .tracks-bar-inner {
    flex-direction: column;
    align-items: stretch;
  }
  .tracks-bar-label {
    border-right: none;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.4rem;
  }
  .tracks-grid-rail {
    grid-template-columns: 1fr;
  }
}

/* Dynamic Pathway Stepper Container */
@keyframes fadeInStepper {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.pathway-stepper-card {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem 1.75rem;
  margin-bottom: 2.25rem;
  box-shadow: var(--glass-shadow);
  animation: fadeInStepper 0.3s ease-out;
}

.stepper-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.stepper-title-group {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.stepper-icon {
  font-size: 1.75rem;
  background: var(--bg-accent-subtle);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 0.4rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.stepper-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.stepper-desc {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 0.2rem;
}

.stepper-actions {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  flex-wrap: wrap;
}

.stepper-stat-badge {
  background: rgba(16, 185, 129, 0.12);
  color: var(--accent-emerald);
  border: 1px solid rgba(16, 185, 129, 0.3);
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.stepper-reset-btn {
  cursor: pointer;
  border-color: rgba(255, 255, 255, 0.2);
  color: var(--text-muted);
  font-size: 0.78rem;
  transition: all 0.2s;
}

.stepper-reset-btn:hover {
  border-color: var(--accent-rose);
  color: var(--accent-rose);
  background: rgba(244, 63, 94, 0.1);
}

.stepper-track-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--accent-cyan);
  text-transform: uppercase;
  margin-bottom: 0.65rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.stepper-track {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  overflow-x: auto;
  padding: 0.4rem 0 0.6rem 0;
  scrollbar-width: thin;
}

.step-pill {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 0.55rem 0.95rem;
  border-radius: 999px;
  color: var(--text-main);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  white-space: nowrap;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  text-decoration: none;
}

.step-pill:hover {
  background: var(--bg-card-hover);
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 15px var(--primary-glow);
}

.step-pill .step-num {
  background: var(--primary);
  color: #ffffff;
  font-weight: 800;
  font-size: 0.7rem;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.step-arrow {
  color: var(--text-dim);
  font-size: 0.95rem;
  flex-shrink: 0;
  user-select: none;
  font-weight: 700;
}

.domain-step-badge {
  background: linear-gradient(90deg, rgba(59, 130, 246, 0.2), rgba(6, 182, 212, 0.2));
  border: 1px solid rgba(6, 182, 212, 0.4);
  color: var(--accent-cyan);
  font-weight: 700;
  font-size: 0.72rem;
  padding: 0.25rem 0.7rem;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-bottom: 0.75rem;
  width: fit-content;
}

.domain-progress-stat {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-weight: 500;
}

@keyframes domainGlowPulse {
  0% {
    transform: scale(1);
    box-shadow: 0 0 0 rgba(6, 182, 212, 0);
  }
  50% {
    transform: scale(1.02);
    box-shadow: 0 0 35px rgba(6, 182, 212, 0.6);
    border-color: var(--accent-cyan);
  }
  100% {
    transform: scale(1);
    box-shadow: 0 0 15px rgba(6, 182, 212, 0.3);
    border-color: var(--accent-cyan);
  }
}

.domain-card.highlight-pulse {
  animation: domainGlowPulse 1.4s ease-in-out;
  border-color: var(--accent-cyan) !important;
}

/* Mind Map Tree Section */
.mindmap-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 1.75rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
}

.section-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.global-sidebar-toggle-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  color: var(--text-main);
  font-size: 1.1rem;
  padding: 0.3rem 0.6rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-right: 0.4rem;
}

.global-sidebar-toggle-btn:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

.header-badge {
  background: rgba(6, 182, 212, 0.1);
  color: var(--accent-cyan);
  border: 1px solid rgba(6, 182, 212, 0.25);
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.2rem 0.55rem;
  border-radius: 12px;
}

.search-box {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: 480px;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  cursor: pointer;
}

.search-box input {
  font-family: var(--font-sans);
  background: var(--input-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--input-border);
  color: var(--text-main);
  padding: 0.6rem 2.8rem 0.6rem 1rem;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  width: 100%;
  transition: all 0.25s ease;
  box-shadow: inset 0 1px 1px rgba(255, 255, 255, 0.08);
  cursor: pointer;
}

.search-box input:focus {
  outline: none;
  border-color: var(--accent-cyan);
  box-shadow: 0 0 15px var(--primary-glow), inset 0 1px 1px rgba(255, 255, 255, 0.12);
}

.search-shortcut-badge {
  position: absolute;
  right: 12px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 0.68rem;
  font-weight: 700;
  font-family: var(--font-mono);
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  pointer-events: none;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

/* Domains Tree Grid */
.domains-tree-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: 1.5rem;
}

.domain-card {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
  box-shadow: var(--glass-shadow);
}

.domain-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.domain-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 0.85rem;
}

.domain-identity {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.domain-icon {
  font-size: 1.6rem;
  background-color: var(--bg-secondary);
  padding: 0.4rem;
  border-radius: var(--radius-md);
}

.domain-name {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
}

.domain-badge {
  font-size: 0.68rem;
  font-weight: 700;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  background-color: rgba(139, 92, 246, 0.15);
  color: var(--accent-purple);
  border: 1px solid rgba(139, 92, 246, 0.3);
}

.domain-desc {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
  line-height: 1.45;
}

/* Subtopics List */
.subtopics-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  flex: 1;
}

.subtopic-item {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.65rem 0.85rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
}

.subtopic-item:hover {
  border-color: var(--primary);
  background-color: var(--bg-card-hover);
  transform: translateX(4px);
}

.subtopic-info {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.subtopic-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--accent-cyan);
}

.subtopic-title {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-main);
}

.subtopic-badge {
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--accent-cyan);
  background-color: rgba(6, 182, 212, 0.1);
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(6, 182, 212, 0.25);
  transition: all 0.2s;
  white-space: nowrap;
}

.subtopic-item:hover .subtopic-badge {
  background-color: var(--accent-cyan);
  color: #0f172a;
  border-color: var(--accent-cyan);
}

/* Levels Group for Frontend */
.level-group {
  margin-bottom: 0.75rem;
}

.level-title {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--accent-amber);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.35rem;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

/* Guide Markdown Reader */
.guide-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: var(--glass-border);
  border-radius: var(--radius-md);
  padding: 0.65rem 1.25rem;
  margin-bottom: 1.5rem;
  position: sticky;
  top: var(--sticky-offset, 100px);
  z-index: 95;
  box-shadow: var(--glass-shadow);
  gap: 1rem;
  overflow: hidden;
}

.guide-reading-progress {
  position: absolute;
  bottom: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--accent-cyan), var(--primary));
  transition: width 0.1s ease;
}

.guide-meta-group {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex: 1;
  min-width: 0;
}

.guide-meta-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 1;
  min-width: 0;
}

.guide-read-time {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  background: var(--bg-accent-subtle);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  white-space: nowrap;
}

.guide-markdown-body {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: var(--glass-shadow);
}

.guide-markdown-body h1,
.guide-markdown-body h2,
.guide-markdown-body h3 {
  font-family: var(--font-display);
  letter-spacing: -0.01em;
  color: var(--text-main);
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
}

.guide-markdown-body h1 {
  font-size: 1.75rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.5rem;
  margin-top: 0;
  color: var(--text-main);
}

.guide-markdown-body h2 {
  font-size: 1.35rem;
  color: var(--primary);
}

.guide-markdown-body p,
.guide-markdown-body ul,
.guide-markdown-body ol {
  font-size: 0.92rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.guide-markdown-body a {
  color: var(--primary);
  font-weight: 500;
  text-decoration: none;
  border-bottom: 1px dashed var(--primary-glow);
  transition: all 0.2s ease;
}

.guide-markdown-body a:visited {
  color: var(--primary);
}

.guide-markdown-body a:hover {
  color: var(--accent-cyan);
  border-bottom-color: var(--accent-cyan);
  text-shadow: 0 0 8px var(--primary-glow);
}

/* Code Block Wrapper & 1-Click Copy Button */
.code-block-wrapper {
  position: relative;
  margin-bottom: 1.25rem;
}

.guide-markdown-body pre,
.code-block-wrapper pre {
  background: var(--code-bg);
  border: 1px solid var(--border-color);
  border-top: 1px solid var(--primary);
  border-radius: var(--radius-md);
  padding: 1.1rem 1.25rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  margin-bottom: 0;
  box-shadow: var(--shadow-sm);
}

.copy-code-btn {
  position: absolute;
  top: 0.55rem;
  right: 0.65rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.25rem 0.55rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  opacity: 0.75;
  transition: all 0.2s ease;
  z-index: 10;
}

.copy-code-btn:hover {
  opacity: 1;
  background: var(--bg-card-hover);
  border-color: var(--primary);
  color: var(--text-main);
  transform: translateY(-1px);
}

.copy-code-btn.copied {
  opacity: 1;
  background: var(--bg-accent-subtle);
  border-color: var(--accent-emerald);
  color: var(--accent-emerald);
}

.guide-markdown-body code {
  font-family: var(--font-mono);
  color: var(--primary);
}

.guide-markdown-body blockquote {
  border-left: 4px solid var(--accent-cyan);
  padding: 0.85rem 1.25rem;
  color: var(--text-main);
  margin-bottom: 1.25rem;
  background: var(--bg-accent-subtle);
  border-top: 1px solid var(--border-color);
  border-right: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

/* Simulators View Domain Grouping & Dividers */
.simulator-domain-group {
  margin-top: 1.5rem;
}

.sim-group-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.sim-group-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.sim-group-badge {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.2rem 0.65rem;
  border-radius: 12px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--accent-cyan);
}

.sim-section-divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-light), transparent);
  margin: 2rem 0;
  opacity: 0.75;
}

/* Simulators Grid */
.simulators-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.25rem;
  margin-top: 0.75rem;
}

.sim-card {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: var(--glass-border);
  border-radius: var(--radius-md);
  padding: 1.35rem 1.5rem;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
  min-height: 210px;
  max-width: 420px;
  width: 100%;
  box-sizing: border-box;
  box-shadow: var(--glass-shadow);
}

.sim-card:hover {
  border-color: var(--primary);
  transform: translateY(-3px) scale(1.005);
  box-shadow: var(--glass-shadow-glow);
}

.sim-icon {
  font-size: 1.8rem;
  margin-bottom: 0.65rem;
}

.sim-title {
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 0.4rem;
  min-height: 2.7rem;
  line-height: 1.35;
  display: flex;
  align-items: center;
}

.sim-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
  flex: 1;
}

.sim-tag {
  align-self: flex-start;
  font-size: 0.65rem;
  font-weight: 700;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-sm);
  background-color: var(--bg-secondary);
  color: var(--accent-cyan);
  border: 1px solid var(--border-color);
}

/* Simulator Modal Overlay & Glassmorphic Container */
.simulator-frame-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 2500;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  box-sizing: border-box;
  animation: fadeInModal 0.25s ease-out;
}

@keyframes fadeInModal {
  from { opacity: 0; transform: scale(0.98); }
  to { opacity: 1; transform: scale(1); }
}

.sim-modal-container {
  width: 94vw;
  max-width: 1400px;
  height: 90vh;
  background-color: var(--bg-card);
  border: var(--glass-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
}

.sim-modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.85rem 1.25rem;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  flex-shrink: 0;
}

.sim-modal-header-left {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.sim-modal-icon {
  font-size: 1.2rem;
}

.sim-modal-header-left h3 {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-main);
}

.sim-modal-header-actions {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.sim-iframe {
  width: 100%;
  flex: 1;
  border: none;
  background-color: #0d1117;
}

/* Footer */
.global-footer {
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
  padding: 1.25rem 2rem;
  margin-top: auto;
}

.footer-content {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  color: var(--text-dim);
  flex-wrap: wrap;
  gap: 0.75rem;
}

.footer-links {
  display: flex;
  gap: 1.25rem;
}

.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s;
}

.footer-links a:hover {
  color: var(--primary);
}

/* Definitions Rapid Revision View */
.definitions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
  gap: 1.25rem;
}

.def-card {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: var(--glass-border);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--glass-shadow);
}

.def-card:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: var(--glass-shadow-glow);
}

.def-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 0.5rem;
  gap: 0.5rem;
}

.def-term {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
}

.def-domain-badge {
  font-size: 0.65rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-sm);
  background-color: var(--bg-secondary);
  color: var(--primary);
  border: 1px solid var(--border-light);
  white-space: nowrap;
}

.def-two-liner {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 0.75rem;
}

.def-details {
  display: none;
  background-color: var(--bg-secondary);
  border-left: 3px solid var(--accent-purple);
  padding: 0.75rem 1rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 0.85rem;
  line-height: 1.5;
}

.def-details.expanded {
  display: block;
  animation: fadeIn 0.25s ease;
}

.def-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: auto;
  padding-top: 0.5rem;
  border-top: 1px solid var(--border-color);
}

.def-toggle-btn {
  background: none;
  border: none;
  color: var(--primary);
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  padding: 0.2rem 0;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

.def-toggle-btn:hover {
  text-decoration: underline;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Quick Recap Single Scrollable View */
.recap-header-banner {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem 2rem;
  margin-bottom: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.5rem;
  box-shadow: var(--glass-shadow);
}

/* Quick Navigation Table of Contents (TOC) Bar */
.recap-toc-bar {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: var(--glass-border);
  border-radius: var(--radius-md);
  padding: 0.85rem 1.25rem;
  margin-bottom: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  position: sticky;
  top: var(--sticky-offset, 100px);
  z-index: 90;
  box-shadow: var(--glass-shadow);
}

.recap-toc-chips-row {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-wrap: wrap;
  width: 100%;
  display: none;
}

.recap-toc-chip {
  font-size: 0.75rem;
  padding: 0.25rem 0.65rem;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

.recap-toc-chip:hover {
  border-color: var(--accent-cyan);
  color: var(--text-main);
  background-color: var(--bg-card-hover);
  transform: translateY(-1px);
}

.recap-toc-bottom-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  width: 100%;
  padding-top: 0.6rem;
  flex-wrap: wrap;
}

.recap-toc-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Lean Single-Row Stats Box */
.recap-stats-box-inline {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 0.3rem 0.75rem;
  white-space: nowrap;
}

.recap-progress-text-inline {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-main);
}

.recap-progress-bar-inline {
  width: 90px;
  height: 6px;
  background-color: var(--bg-primary);
  border-radius: 999px;
  overflow: hidden;
  border: 1px solid var(--border-color);
  display: inline-block;
  vertical-align: middle;
}

.recap-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-emerald));
  border-radius: 999px;
  transition: width 0.3s ease;
}

.btn-reset-inline {
  padding: 0.15rem 0.5rem !important;
  font-size: 0.72rem !important;
  line-height: 1.2;
}

/* App Layout Body & Global Collapsible Left Navigation Bar */
.app-layout-body {
  display: flex;
  flex: 1;
  width: 100%;
  min-height: calc(100vh - (var(--header-height, 88px)));
  position: relative;
}

.global-left-sidebar {
  width: 220px;
  min-width: 220px;
  position: sticky;
  top: calc(var(--header-height, 88px));
  height: calc(100vh - (var(--header-height, 88px)));
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-right: var(--glass-border);
  box-shadow: var(--glass-shadow);
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  padding: 1rem 0.75rem;
  z-index: 90;
  transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1), min-width 0.3s cubic-bezier(0.4, 0, 0.2, 1), padding 0.3s ease;
  flex-shrink: 0;
}

.app-layout-body.global-sidebar-collapsed .global-left-sidebar,
.app-layout-body.global-sidebar-collapsed .gnav-list {
  overflow: visible !important;
}

.app-layout-body.global-sidebar-collapsed .global-left-sidebar {
  width: 64px;
  min-width: 64px;
  padding: 1rem 0.4rem;
}

.gnav-top-header {
  width: 100%;
  padding-bottom: 0.75rem;
  margin-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-color);
}

.gnav-toggle-btn {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  width: 100%;
  padding: 0.55rem 0.75rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  color: var(--text-main);
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
  overflow: hidden;
}

.gnav-toggle-btn:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

.gnav-toggle-btn .toggle-icon {
  font-size: 1.1rem;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  flex-shrink: 0;
}

.app-layout-body.global-sidebar-collapsed .gnav-toggle-btn {
  padding: 0.55rem 0;
  justify-content: center;
}

.app-layout-body.global-sidebar-collapsed .gnav-toggle-btn .toggle-label {
  display: none;
}

.gnav-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  width: 100%;
}

.gnav-item-btn {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.65rem 0.85rem;
  border-radius: var(--radius-md);
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
  white-space: nowrap;
  overflow: hidden;
  text-decoration: none;
  width: 100%;
  text-align: left;
}

.gnav-item-btn:hover {
  background: var(--bg-card-hover);
  color: var(--text-main);
  border-color: var(--border-light);
}

.gnav-item-btn.active {
  background: rgba(6, 182, 212, 0.12);
  color: var(--accent-cyan);
  border-color: rgba(6, 182, 212, 0.3);
  box-shadow: 0 2px 10px rgba(6, 182, 212, 0.15);
}

.gnav-icon {
  font-size: 1.15rem;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  flex-shrink: 0;
}

.gnav-text {
  white-space: nowrap;
  opacity: 1;
  transition: opacity 0.2s ease;
}

.app-layout-body.global-sidebar-collapsed .gnav-item-btn {
  padding: 0.65rem 0.65rem;
  justify-content: flex-start;
  width: 42px;
  overflow: hidden;
  transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1), background 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
  position: relative;
  z-index: 1;
}

.app-layout-body.global-sidebar-collapsed .gnav-text {
  display: inline-block;
  max-width: 0;
  opacity: 0;
  overflow: hidden;
  white-space: nowrap;
  transition: max-width 0.3s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.25s ease, margin 0.2s ease;
  margin-left: 0;
  font-size: 0.82rem;
}

.app-layout-body.global-sidebar-collapsed .gnav-item-btn:hover {
  width: 190px;
  background: rgba(15, 23, 42, 0.95);
  border-color: var(--accent-cyan);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5), 0 0 14px rgba(6, 182, 212, 0.35);
  z-index: 1000;
}

.app-layout-body.global-sidebar-collapsed .gnav-item-btn:hover .gnav-text {
  max-width: 150px;
  opacity: 1;
  margin-left: 0.5rem;
}

/* 2-Column Split Layout for Quick Recap */
.recap-split-layout {
  display: grid;
  grid-template-columns: 310px 1fr;
  gap: 2rem;
  align-items: start;
}

/* Left Sticky Tree Sidebar */
.recap-tree-sidebar {
  position: sticky;
  top: calc(var(--header-height, 88px) + 4.5rem);
  height: calc(100vh - (var(--header-height, 88px) + 5.5rem));
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: var(--glass-border);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  box-shadow: var(--glass-shadow);
}
  font-weight: 600;
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s ease, transform 0.2s ease;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
  z-index: 100;
}

.recap-split-layout.sidebar-collapsed .recap-tree-domain-title:hover::after {
  opacity: 1;
  visibility: visible;
  transform: translateY(-50%) translateX(4px);
}

.recap-tree-header {
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-color);
}

.recap-tree-title-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.6rem;
}

.recap-tree-title {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-cyan);
}

.recap-tree-quick-toggles {
  display: flex;
  gap: 0.35rem;
}

.tree-mini-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 0.68rem;
  font-weight: 600;
  padding: 0.15rem 0.4rem;
  cursor: pointer;
  transition: all 0.15s;
}

.tree-mini-btn:hover {
  color: var(--text-main);
  border-color: var(--accent-cyan);
  background: var(--bg-card-hover);
}

.recap-tree-search {
  width: 100%;
  font-family: var(--font-sans);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 0.45rem 0.75rem;
  font-size: 0.78rem;
  color: var(--text-main);
  outline: none;
  transition: border-color 0.2s;
}

.recap-tree-search:focus {
  border-color: var(--primary);
}

.recap-tree-nav {
  flex: 1;
  overflow-y: auto;
  padding-right: 0.4rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

/* Custom Scrollbar for Tree Nav */
.recap-tree-nav::-webkit-scrollbar {
  width: 5px;
}

.recap-tree-nav::-webkit-scrollbar-thumb {
  background-color: var(--border-light);
  border-radius: 4px;
}

.recap-tree-domain {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.recap-tree-domain-title {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--accent-amber);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  padding: 0.35rem 0.5rem;
  cursor: pointer;
  border-radius: var(--radius-sm);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: rgba(245, 158, 11, 0.05);
  border: 1px solid rgba(245, 158, 11, 0.15);
  transition: all 0.2s;
}

.recap-tree-domain-title:hover {
  background-color: rgba(245, 158, 11, 0.12);
  color: #fcd34d;
  border-color: var(--accent-amber);
}

.recap-tree-domain-arrow {
  font-size: 0.7rem;
  color: var(--text-dim);
  transition: transform 0.2s;
}

.recap-tree-domain.tree-collapsed .recap-tree-domain-arrow {
  transform: rotate(-90deg);
}

.recap-tree-items-list {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding-left: 0.75rem;
  border-left: 2px solid var(--border-light);
  margin-left: 0.5rem;
  margin-top: 0.25rem;
}

.recap-tree-domain.tree-collapsed .recap-tree-items-list {
  display: none;
}

.recap-tree-item-link {
  font-size: 0.78rem;
  color: var(--text-muted);
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s ease;
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-decoration: none;
  gap: 0.4rem;
}

.recap-tree-item-link:hover {
  color: var(--text-main);
  background-color: var(--bg-secondary);
  border-left: 2px solid var(--accent-cyan);
}

.recap-tree-item-link.checked {
  color: var(--accent-emerald);
}

.recap-tree-status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--border-light);
  flex-shrink: 0;
}

.recap-tree-item-link.checked .recap-tree-status-dot {
  background-color: var(--accent-emerald);
  box-shadow: 0 0 6px rgba(16, 185, 129, 0.6);
}

.recap-document-pane {
  min-width: 0;
}

.recap-topic-card {
  scroll-margin-top: 150px;
}

/* Responsive Split Layout */
@media (max-width: 1024px) {
  .recap-split-layout {
    grid-template-columns: 1fr;
  }

  .recap-tree-sidebar {
    position: relative;
    top: 0;
    height: 280px;
  }
}

.recap-section-header {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 1rem;
  padding: 0.8rem 1.1rem;
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: var(--glass-border);
  border-radius: var(--radius-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  user-select: none;
  transition: all 0.25s ease;
  box-shadow: var(--shadow-sm);
}

.recap-section-header:hover {
  color: var(--accent-cyan);
  background: var(--bg-card-hover);
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
}

.recap-section-title-wrap {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.recap-section-toggle-icon {
  font-size: 0.85rem;
  color: var(--text-dim);
  transition: transform 0.2s;
}

.recap-section-group.collapsed .recap-section-toggle-icon {
  transform: rotate(-90deg);
}

.recap-section-body {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.recap-section-group.collapsed .recap-section-body {
  display: none;
}

.recap-topic-card {
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  margin-bottom: 1rem;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: var(--shadow-sm);
  scroll-margin-top: calc(var(--header-height, 88px) + 3rem);
}

.recap-topic-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
}

.recap-topic-card.completed {
  border-color: var(--accent-emerald);
  background: var(--bg-card);
  box-shadow: 0 0 12px rgba(16, 185, 129, 0.15);
}

.recap-topic-header {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  margin-bottom: 0.85rem;
}

.recap-checkbox {
  appearance: none;
  width: 20px;
  height: 20px;
  border: 2px solid var(--border-light);
  border-radius: 4px;
  background-color: var(--bg-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  flex-shrink: 0;
}

.recap-checkbox:checked {
  background-color: var(--accent-emerald);
  border-color: var(--accent-emerald);
}

.recap-checkbox:checked::after {
  content: '✓';
  color: #fff;
  font-size: 0.8rem;
  font-weight: 800;
}

.recap-topic-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
}

.recap-topic-card.completed .recap-topic-title {
  color: var(--accent-emerald);
}

.recap-topic-body {
  padding-left: 2.1rem;
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.recap-topic-body ul {
  list-style: none;
  padding: 0;
}

.recap-topic-body li {
  margin-bottom: 0.5rem;
}

.recap-section-intro {
  padding: 0.85rem 1.15rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-md);
  margin-bottom: 1rem;
  font-size: 0.9rem;
  color: var(--text-main);
  line-height: 1.6;
}

.recap-section-intro blockquote {
  border-left: 3px solid var(--primary);
  padding-left: 0.75rem;
  margin: 0.5rem 0;
  color: var(--text-muted);
}

.recap-section-intro pre {
  background: var(--code-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  margin: 0.5rem 0;
  color: var(--text-main);
}

.recap-document-container a,
.recap-topic-body a,
.recap-section-intro a {
  color: var(--primary);
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.recap-document-container a:visited,
.recap-topic-body a:visited,
.recap-section-intro a:visited {
  color: var(--primary);
}

.recap-document-container a:hover,
.recap-topic-body a:hover,
.recap-section-intro a:hover {
  color: var(--accent-cyan);
  text-shadow: 0 0 10px var(--primary-glow);
}

/* Fast-Track Portal & Topic Body Interactive Links */
.recap-topic-body li a,
.recap-section-intro li a {
  color: var(--primary);
  font-weight: 600;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-sm);
  background: var(--bg-accent-subtle);
  border: 1px solid var(--border-color);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.recap-topic-body li a:visited,
.recap-section-intro li a:visited {
  color: var(--primary);
}

.recap-topic-body li a:hover,
.recap-section-intro li a:hover {
  color: var(--primary);
  background: var(--bg-card-hover);
  border-color: var(--primary);
  box-shadow: 0 0 10px var(--primary-glow);
  transform: translateX(3px);
  text-decoration: none;
}

.recap-topic-body strong {
  color: var(--primary);
}

.recap-guide-btn {
  margin-top: 0.6rem;
  display: inline-block;
}

/* Deep Guide Global Search Results Overlay */
.search-results-overlay {
  background-color: var(--bg-card);
  border: 1px solid var(--accent-cyan);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  margin-bottom: 1.5rem;
  box-shadow: 0 8px 24px rgba(6, 182, 212, 0.15);
  animation: fadeIn 0.2s ease;
}

.search-results-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border-color);
}

.search-results-title {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--accent-cyan);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.search-results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 0.65rem;
}

.search-match-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 0.65rem 0.85rem;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.search-match-card:hover {
  border-color: var(--accent-cyan);
  background-color: var(--bg-card-hover);
  transform: translateY(-2px);
}

.search-match-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.search-match-header {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Quick Recap Section Intro & Flowchart Callout */
.recap-section-intro {
  background-color: var(--bg-card);
  border: 1px solid var(--border-light);
  border-left: 4px solid var(--accent-cyan);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  margin-bottom: 1.25rem;
  font-size: 0.88rem;
  color: var(--text-main);
  box-shadow: var(--shadow-sm);
}

.recap-section-intro blockquote {
  margin: 0;
  padding: 0;
  border: none;
}

.recap-section-intro pre {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  color: var(--accent-cyan);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.45;
  overflow-x: auto;
  margin-top: 0.5rem;
}

/* Floating Controls at Bottom Right */
.floating-right-controls {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 9999;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  transition: right 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.app-container.ai-panel-open #ai-fab-btn {
  display: none !important;
}

.app-container.ai-panel-open .floating-right-controls {
  right: 475px;
}

.app-container.ai-panel-open.wide-mode .floating-right-controls {
  right: 695px;
}

.ai-fab-btn {
  background-color: var(--bg-card);
  border: 1px solid var(--accent-purple);
  color: var(--accent-purple);
  border-radius: 999px;
  padding: 0.6rem 1.1rem;
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 8px 24px rgba(139, 92, 246, 0.35);
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.ai-fab-btn:hover {
  background-color: var(--accent-purple);
  color: #ffffff;
  box-shadow: 0 12px 32px rgba(139, 92, 246, 0.55);
  transform: translateY(-3px);
}

.back-to-top-btn {
  background-color: var(--primary);
  color: #ffffff;
  border: 1px solid var(--accent-cyan);
  border-radius: 999px;
  padding: 0.6rem 1.1rem;
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 8px 24px rgba(6, 182, 212, 0.35);
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  align-items: center;
  gap: 0.35rem;
  opacity: 0;
  pointer-events: none;
  transform: translateY(12px);
}

.back-to-top-btn.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.back-to-top-btn:hover {
  background-color: var(--accent-cyan);
  color: #0f172a;
  box-shadow: 0 12px 32px rgba(6, 182, 212, 0.5);
  transform: translateY(-3px);
}

/* Docked Right Sidebar AI Panel (Pushes App Content to the Left) */
.ai-widget-panel {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 460px;
  max-width: 90vw;
  height: 100vh;
  background: var(--glass-bg);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-left: var(--glass-border);
  box-shadow: var(--glass-shadow);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1), transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  animation: slideInSidebar 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.ai-widget-panel.wide-mode {
  width: 680px;
}

@keyframes slideInSidebar {
  from {
    transform: translateX(100%);
  }

  to {
    transform: translateX(0);
  }
}

.ai-drawer-header {
  padding: 0.85rem 1rem;
  border-bottom: var(--glass-border);
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  background: var(--bg-secondary);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
}

.ai-drawer-header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.ai-drawer-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.ai-icon {
  font-size: 1.3rem;
}

.ai-title-group {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.ai-title-text {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 0;
}

.ai-byok-tag {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--accent-purple);
  background: rgba(139, 92, 246, 0.15);
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
  border: 1px solid rgba(139, 92, 246, 0.25);
}

.ai-status-badge {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--bg-accent-subtle);
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
  border: 1px solid var(--border-color);
}

.ai-status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
}

.ai-status-dot.configured {
  background-color: var(--accent-emerald, #10b981);
  box-shadow: 0 0 8px rgba(16, 185, 129, 0.6);
}

.ai-status-dot.missing {
  background-color: var(--accent-rose, #f43f5e);
  box-shadow: 0 0 8px rgba(244, 63, 94, 0.6);
}

.ai-header-actions {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  width: 100%;
}

.ai-header-actions .btn {
  flex: 1;
  justify-content: center;
  font-size: 0.76rem;
  padding: 0.35rem 0.5rem;
}

.ai-header-actions .ai-close-btn {
  flex: 0 0 auto;
  padding: 0.35rem 0.65rem;
}

.ai-key-config {
  padding: 0.85rem 1rem;
  border-bottom: var(--glass-border);
  background: var(--bg-accent-subtle);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.key-config-row {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 0.4rem;
}

.key-config-row select {
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  color: var(--input-text);
  border-radius: var(--radius-sm);
  padding: 0.35rem 0.5rem;
  font-size: 0.78rem;
  outline: none;
}

.key-config-row input {
  flex: 1;
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  color: var(--input-text);
  border-radius: var(--radius-sm);
  padding: 0.35rem 0.5rem;
  font-size: 0.78rem;
  font-family: var(--font-mono);
  outline: none;
}

.key-hint {
  font-size: 0.7rem;
  color: var(--text-muted);
  line-height: 1.3;
}

.ai-chat-body {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 0.75rem 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  box-sizing: border-box;
}

.ai-msg {
  padding: 0.75rem 0.9rem;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  line-height: 1.5;
  max-width: 100%;
  box-sizing: border-box;
  word-break: break-word;
  overflow-wrap: anywhere;
}

.bot-msg {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  color: var(--text-main);
  align-self: flex-start;
  width: 100%;
}

.user-msg {
  background: var(--primary);
  border: 1px solid var(--primary);
  box-shadow: 0 4px 16px var(--primary-glow);
  color: #ffffff;
  align-self: flex-end;
  max-width: 90%;
}

.msg-sender {
  font-size: 0.7rem;
  font-weight: 700;
  margin-bottom: 0.3rem;
  color: var(--primary);
}

.msg-content {
  word-break: break-word;
  overflow-wrap: anywhere;
  max-width: 100%;
  box-sizing: border-box;
}

.msg-content p,
.msg-content ul,
.msg-content ol,
.msg-content li {
  margin-bottom: 0.4rem;
  word-break: break-word;
  overflow-wrap: anywhere;
}

.msg-content ol,
.msg-content ul {
  padding-left: 1.2rem;
}

.msg-content pre {
  max-width: 100%;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-all;
  background: var(--code-bg);
  padding: 0.6rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  margin: 0.5rem 0;
  color: var(--text-main);
}

.msg-content code {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  word-break: break-word;
  white-space: pre-wrap;
}

/* Active Context Bar inside AI panel */
.ai-context-bar {
  padding: 0.5rem 0.85rem;
  background: var(--bg-accent-subtle);
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  font-size: 0.75rem;
}

.ai-context-bar span {
  color: var(--primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.btn-context-chip {
  background-color: var(--bg-card);
  border: 1px solid var(--primary);
  color: var(--primary);
  border-radius: 999px;
  padding: 0.25rem 0.6rem;
  font-size: 0.72rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s;
}

.btn-context-chip:hover {
  background-color: var(--primary);
  color: #ffffff;
}

.ai-chat-input-row {
  padding: 0.75rem 1rem;
  border-top: var(--glass-border);
  background: var(--bg-secondary);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  display: flex;
  gap: 0.5rem;
  align-items: flex-end;
}

.ai-chat-input-row textarea {
  flex: 1;
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: var(--radius-sm);
  color: var(--input-text);
  padding: 0.5rem 0.75rem;
  font-size: 0.85rem;
  font-family: var(--font-sans);
  resize: none;
  outline: none;
  transition: all 0.2s ease;
}

.ai-chat-input-row textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 12px var(--primary-glow);
}

/* ==========================================================================
   Interactive Mind Map Graph Dashboard & Frosted Modal
   ========================================================================== */

.graph-dashboard-header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

/* Combined Sticky Controls Container (Fixed below top navbar) */
.graph-sticky-controls {
  position: sticky;
  top: var(--sticky-offset, 100px);
  z-index: 90;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: var(--glass-border);
  padding: 0.65rem 0.95rem;
  border-radius: 14px;
  box-shadow: var(--glass-shadow);
  margin-bottom: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.graph-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  width: 100%;
}

.toolbar-group {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.toolbar-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-right: 0.25rem;
}

.btn-axis {
  background: var(--bg-card);
  color: var(--text-muted);
  border: 1px solid var(--border-color);
  padding: 0.35rem 0.65rem;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-axis:hover {
  color: var(--text-main);
  background: var(--bg-card-hover);
  border-color: var(--primary);
}

.btn-axis.active {
  background: var(--bg-accent-subtle);
  color: var(--primary);
  border-color: var(--primary);
  box-shadow: 0 0 12px var(--primary-glow);
}

.graph-select-input {
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  color: var(--primary);
  padding: 0.35rem 0.65rem;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 600;
  outline: none;
  cursor: pointer;
  max-width: 210px;
  transition: all 0.2s ease;
}

.graph-select-input option {
  background: var(--bg-card);
  color: var(--text-main);
  font-weight: 500;
  padding: 0.25rem;
}

.graph-select-input:focus,
.graph-select-input:hover {
  border-color: var(--primary);
  box-shadow: 0 0 10px var(--primary-glow);
}

.graph-canvas-wrapper {
  width: 100%;
  height: 1400px;
  min-height: 1400px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.graph-canvas {
  display: block;
  width: 100%;
  height: 100%;
  cursor: default;
}

/* Frosted Glass Node Detail Modal */
.graph-modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(8px);
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: fadeIn 0.2s ease-out;
}

.graph-modal-content {
  background: var(--bg-card);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: var(--glass-border);
  border-radius: 16px;
  padding: 1.5rem 1.75rem;
  width: 90%;
  max-width: 520px;
  box-shadow: var(--shadow-lg);
  position: relative;
  color: var(--text-main);
}

.graph-modal-close {
  position: absolute;
  top: 1rem;
  right: 1.25rem;
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  cursor: pointer;
}

.graph-modal-close:hover {
  color: var(--text-main);
}

.graph-modal-header h2 {
  font-size: 1.35rem;
  font-weight: 700;
  margin: 0.4rem 0 0.2rem 0;
  color: var(--text-main);
}

.gmodal-subtitle {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
}

.graph-modal-body {
  margin-top: 1rem;
}

.gmodal-taxonomies {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  background: var(--bg-secondary);
  padding: 0.75rem;
  border-radius: 8px;
  margin: 1rem 0;
  font-size: 0.78rem;
}

.gtax-pill {
  color: var(--text-muted);
}

.gmodal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
}

/* Color Legend Bar (Integrated inside sticky controls container) */
.graph-legend-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem 0.85rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--border-color);
}

.legend-title {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.legend-chip {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
}

.legend-root {
  color: var(--accent-purple);
}

.legend-backend {
  color: var(--accent-emerald);
}

.legend-distributed {
  color: var(--accent-cyan);
}

.legend-cloud {
  color: var(--primary);
}

.legend-security {
  color: var(--accent-amber);
}

.legend-frontend {
  color: var(--accent-rose);
}

.legend-ai {
  color: var(--accent-purple);
}

/* Rich Recap Definition Box inside Modal */
.gmodal-recap-box {
  background: var(--bg-secondary);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 0.85rem 1rem;
  max-height: 320px;
  overflow-y: auto;
  margin-bottom: 0.85rem;
  box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.05);
}

.recap-section-item {
  margin-bottom: 0.65rem;
}

.recap-section-item:last-child {
  margin-bottom: 0;
}

.recap-label {
  font-size: 0.76rem;
  font-weight: 700;
  color: var(--primary);
  display: block;
  margin-bottom: 0.15rem;
}

.recap-section-item p {
  font-size: 0.78rem;
  line-height: 1.45;
  color: var(--text-muted);
  margin: 0;
}

/* ==========================================================================
   System Design Hub & Interactive Module Styling
   ========================================================================== */
.umbrella-badge {
  font-size: 0.65rem;
  padding: 2px 6px;
  background: var(--badge-bg);
  border: 1px solid var(--badge-border);
  border-radius: 10px;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.sd-module-btn {
  font-weight: 600;
  border-radius: 10px;
  transition: all 0.2s ease;
}

/* ==========================================================================
   Comprehensive Mobile & Tablet Responsive Media Queries
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Large Desktop & Laptops (<= 1200px)
   -------------------------------------------------------------------------- */
@media (max-width: 1200px) {
  .domains-tree-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
  }

  .main-content {
    max-width: 100%;
    padding: 1.5rem;
  }
}

/* --------------------------------------------------------------------------
   2. Tablets & Small Laptops (<= 1024px)
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .global-header {
    padding: 0.85rem 1.25rem;
    gap: 1rem;
  }

  .search-box {
    max-width: 320px;
  }

  .header-actions .btn.nav-btn-icon .nav-text {
    display: none; /* Icon-only pills on tablet */
  }

  .header-actions .btn.nav-btn-icon {
    padding: 0.45rem 0.65rem;
  }

  .tracks-bar-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.6rem;
  }

  .tracks-grid-rail {
    width: 100%;
    overflow-x: auto;
    display: flex;
    gap: 0.65rem;
    padding-bottom: 0.35rem;
    -webkit-overflow-scrolling: touch;
  }

  .track-pill-card {
    flex: 0 0 240px;
  }

  .recap-split-layout {
    gap: 1rem;
  }

  .recap-tree-sidebar {
    width: 250px;
    min-width: 250px;
  }
}

/* --------------------------------------------------------------------------
   3. Medium Screens & Portrait Tablets (<= 900px)
   -------------------------------------------------------------------------- */
@media (max-width: 900px) {
  /* Quick Recap Split Layout Transformation */
  .recap-tree-mobile-bar {
    display: block;
    margin-bottom: 1rem;
  }

  .recap-tree-mobile-toggle {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.65rem 1rem;
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    color: var(--text-main);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
  }

  .recap-tree-mobile-toggle.active {
    border-color: var(--accent-cyan);
    background: rgba(6, 182, 212, 0.1);
    color: var(--accent-cyan);
  }

  .recap-split-layout {
    flex-direction: column;
    gap: 1.25rem;
  }

  .recap-tree-sidebar {
    display: none;
    width: 100% !important;
    min-width: 100% !important;
    max-height: 420px;
    overflow-y: auto;
    position: static !important;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
    background: var(--bg-card);
    padding: 1rem;
  }

  .recap-tree-sidebar.mobile-expanded {
    display: block !important;
  }

  .recap-document-pane {
    width: 100% !important;
    min-width: 100% !important;
  }

  .recap-toc-chips-row {
    display: flex;
    overflow-x: auto;
    white-space: nowrap;
    padding: 0.35rem 0;
    gap: 0.4rem;
    -webkit-overflow-scrolling: touch;
  }

  .recap-toc-bottom-row {
    flex-direction: column;
    align-items: stretch;
    gap: 0.75rem;
  }

  .recap-stats-box-inline {
    width: 100%;
    justify-content: space-between;
  }

  .recap-progress-bar-inline {
    flex: 1;
    max-width: none;
  }

  .recap-toc-actions {
    display: flex;
    justify-content: space-between;
    width: 100%;
    gap: 0.5rem;
  }

  .recap-toc-actions .btn {
    flex: 1;
    justify-content: center;
  }
}

/* --------------------------------------------------------------------------
   4. Mobile Phones & Phablets (<= 768px) - Core Responsive Transition
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
  /* Prevent horizontal scrolling on mobile */
  html, body {
    overflow-x: hidden;
    width: 100%;
    position: relative;
  }

  .app-container {
    overflow-x: hidden;
    width: 100%;
  }

  .app-container.ai-panel-open,
  .app-container.ai-panel-open.wide-mode {
    margin-right: 0 !important; /* Never push app layout off-screen */
  }

  /* Header & Navigation */
  .global-header {
    padding: 0.75rem 1rem;
    flex-wrap: wrap;
    gap: 0.65rem;
  }

  .header-left-group {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    flex: 1;
    min-width: 0;
  }

  .mobile-menu-toggle-btn {
    display: inline-flex;
    flex-shrink: 0;
  }

  .brand-section {
    gap: 0.65rem;
    min-width: 0;
  }

  .logo-icon {
    font-size: 1.4rem;
    padding: 0.3rem;
  }

  .app-title {
    font-size: 1rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .app-subtitle {
    font-size: 0.68rem;
    display: none; /* Hide subtitle on mobile header for clean layout */
  }

  .search-box {
    position: static !important;
    transform: none !important;
    left: auto !important;
    order: 3;
    width: 100% !important;
    max-width: 100% !important;
    margin: 0.35rem 0 0 0 !important;
    z-index: 1;
  }

  .search-box input {
    font-size: 0.85rem;
    padding: 0.65rem 1rem 0.65rem 1rem;
    border-radius: var(--radius-md);
    width: 100%;
  }

  .header-actions {
    display: none; /* Managed via sleek mobile drawer */
  }

  /* Off-Canvas Navigation Drawer */
  .sidebar-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(3, 7, 18, 0.75);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 998;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  }

  .sidebar-backdrop.active {
    opacity: 1;
    pointer-events: auto;
  }

  .app-layout-body {
    flex-direction: column;
    min-height: auto;
    width: 100%;
  }

  .global-left-sidebar {
    position: fixed !important;
    top: 0 !important;
    left: 0 !important;
    bottom: 0 !important;
    height: 100dvh !important;
    width: 280px !important;
    min-width: 280px !important;
    max-width: 85vw !important;
    z-index: 999 !important;
    transform: translateX(-100%) !important;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1) !important;
    background: rgba(9, 13, 22, 0.96) !important;
    backdrop-filter: blur(20px) !important;
    -webkit-backdrop-filter: blur(20px) !important;
    border-right: 1px solid rgba(255, 255, 255, 0.12) !important;
    box-shadow: 0 0 40px rgba(0, 0, 0, 0.9) !important;
    padding: max(1.25rem, env(safe-area-inset-top)) 1rem 1.5rem 1rem !important;
    overflow-y: auto !important;
  }

  .app-layout-body.mobile-drawer-open .global-left-sidebar {
    transform: translateX(0) !important;
  }

  .gnav-top-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: 0.85rem;
    margin-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
  }

  .gnav-toggle-btn {
    pointer-events: none;
    background: transparent;
    border: none;
    padding: 0;
    font-size: 0.95rem;
    color: var(--text-main);
  }

  .gnav-mobile-close-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--border-light);
    border-radius: 50%;
    color: var(--text-muted);
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s ease;
  }

  .gnav-mobile-close-btn:hover {
    color: #fff;
    background: rgba(244, 63, 94, 0.2);
    border-color: var(--accent-rose);
  }

  .gnav-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
  }

  .gnav-item-btn {
    padding: 0.75rem 1rem;
    font-size: 0.9rem;
    border-radius: var(--radius-md);
    width: 100%;
    justify-content: flex-start;
  }

  .gnav-item-btn .gnav-text {
    opacity: 1 !important;
    max-width: none !important;
    margin-left: 0.75rem !important;
    display: inline-block !important;
  }

  /* Main Content Padding */
  .main-content {
    padding: 1rem 0.85rem;
    width: 100%;
  }

  /* Career Tracks & Pathway Stepper */
  .tracks-sticky-bar {
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-md);
    margin-bottom: 1.25rem;
  }

  .tracks-bar-label {
    font-size: 0.72rem;
  }

  .tracks-grid-rail {
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 0.4rem;
  }

  .track-pill-card {
    flex: 0 0 220px;
    padding: 0.65rem 0.85rem;
    scroll-snap-align: start;
  }

  .track-pill-title {
    font-size: 0.82rem;
  }

  .track-pill-sub {
    font-size: 0.68rem;
  }

  .stepper-container {
    padding: 1rem 0.85rem;
    border-radius: var(--radius-lg);
  }

  .stepper-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }

  .stepper-title {
    font-size: 1.05rem;
  }

  .stepper-actions {
    width: 100%;
    justify-content: space-between;
  }

  .stepper-track {
    padding: 0.35rem 0;
    gap: 0.45rem;
  }

  .step-pill {
    padding: 0.45rem 0.75rem;
    font-size: 0.75rem;
  }

  /* Domains Grid (1-Column Stack) */
  .domains-tree-grid {
    grid-template-columns: 1fr !important;
    gap: 1.15rem;
  }

  .domain-card {
    padding: 1.25rem 1rem;
    border-radius: var(--radius-lg);
  }

  .domain-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.65rem;
  }

  .domain-identity {
    gap: 0.75rem;
  }

  .domain-icon {
    font-size: 1.6rem;
    width: 44px;
    height: 44px;
  }

  .domain-name {
    font-size: 1.1rem;
  }

  .domain-badge {
    align-self: flex-start;
  }

  .domain-desc {
    font-size: 0.82rem;
    margin-bottom: 1rem;
  }

  .subtopic-item {
    padding: 0.65rem 0.75rem;
    min-height: 44px; /* Touch friendly */
    gap: 0.5rem;
  }

  .subtopic-title {
    font-size: 0.82rem;
  }

  .subtopic-badge {
    font-size: 0.68rem;
    padding: 0.15rem 0.45rem;
  }

  /* System Design Hub */
  .paths-banner {
    padding: 1.25rem 1rem !important;
    border-radius: var(--radius-lg) !important;
    margin-bottom: 1rem !important;
  }

  .banner-title {
    font-size: 1.35rem !important;
    line-height: 1.25 !important;
  }

  .section-desc {
    font-size: 0.82rem !important;
  }

  .sd-hub-tabs {
    display: flex !important;
    overflow-x: auto !important;
    white-space: nowrap !important;
    gap: 0.5rem !important;
    padding-bottom: 0.4rem !important;
    -webkit-overflow-scrolling: touch;
  }

  .sd-module-btn {
    flex-shrink: 0;
    padding: 0.45rem 0.8rem !important;
    font-size: 0.78rem !important;
  }

  #system-design-frame-container {
    min-height: 70vh !important;
    height: 70vh !important;
    border-radius: var(--radius-md) !important;
  }

  #sd-module-iframe {
    height: 70vh !important;
  }

  /* Graph Dashboard */
  .graph-dashboard-header {
    padding: 1.25rem 1rem;
  }

  .graph-sticky-controls {
    padding: 0.65rem 0.5rem;
    border-radius: var(--radius-md);
  }

  .graph-toolbar {
    flex-direction: column;
    align-items: stretch;
    gap: 0.6rem;
  }

  .toolbar-group {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
    width: 100%;
  }

  .toolbar-group .btn-axis {
    flex: 1;
    text-align: center;
    padding: 0.4rem 0.5rem;
    font-size: 0.75rem;
  }

  .graph-select-input {
    width: 100%;
    font-size: 0.8rem;
    padding: 0.45rem 0.65rem;
  }

  .graph-legend-bar {
    display: flex;
    overflow-x: auto;
    white-space: nowrap;
    padding: 0.35rem 0;
    gap: 0.4rem;
    -webkit-overflow-scrolling: touch;
  }

  .legend-chip {
    font-size: 0.72rem;
    flex-shrink: 0;
  }

  .graph-canvas-wrapper {
    min-height: 60vh;
    height: 60vh;
    border-radius: var(--radius-md);
  }

  /* Simulators View */
  .simulators-header {
    padding: 1.25rem 1rem;
  }

  .simulators-grid {
    grid-template-columns: 1fr !important;
    gap: 1rem;
  }

  .sim-card {
    padding: 1.25rem 1rem;
  }

  /* Simulator Fullscreen Modal */
  .sim-modal-container {
    width: 100vw !important;
    height: 100dvh !important;
    max-width: 100vw !important;
    max-height: 100dvh !important;
    border-radius: 0 !important;
    margin: 0 !important;
    border: none !important;
  }

  .sim-modal-header {
    padding: 0.65rem 1rem;
    border-radius: 0;
  }

  .sim-modal-header h3 {
    font-size: 0.95rem;
    max-width: 60vw;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  /* Topic Guide Viewer */
  .guide-toolbar {
    flex-wrap: wrap;
    gap: 0.5rem;
    padding: 0.65rem 0.85rem;
  }

  .guide-meta-title {
    font-size: 0.95rem;
    order: 3;
    width: 100%;
    margin-top: 0.25rem;
  }

  .guide-markdown-body {
    padding: 1.25rem 1rem;
  }

  /* Graph Node Details Modal */
  .graph-modal-content {
    width: 95vw !important;
    max-width: 95vw !important;
    max-height: 88vh !important;
    padding: 1.25rem 1rem !important;
    border-radius: var(--radius-lg) !important;
  }

  .gmodal-recap-box {
    max-height: 240px;
    padding: 0.75rem 0.85rem;
  }

  .gmodal-taxonomies {
    flex-direction: column;
    gap: 0.35rem;
  }

  /* Floating Action Buttons */
  .floating-right-controls {
    bottom: max(1.25rem, env(safe-area-inset-bottom));
    right: 1rem;
    gap: 0.6rem;
  }

  .back-to-top-btn {
    padding: 0.55rem 0.85rem;
    font-size: 0.78rem;
    border-radius: 20px;
  }

  .ai-fab-btn {
    padding: 0.65rem 1.1rem;
    font-size: 0.85rem;
    border-radius: 25px;
    box-shadow: 0 4px 20px rgba(6, 182, 212, 0.4);
  }

  /* AI Assistant Bottom Sheet Drawer */
  .ai-widget-panel {
    position: fixed !important;
    top: auto !important;
    bottom: 0 !important;
    left: 0 !important;
    right: 0 !important;
    width: 100vw !important;
    max-width: 100vw !important;
    height: 85vh !important;
    max-height: 85dvh !important;
    border-radius: 20px 20px 0 0 !important;
    border-left: 1px solid rgba(255, 255, 255, 0.15) !important;
    border-right: 1px solid rgba(255, 255, 255, 0.15) !important;
    border-top: 1px solid var(--accent-cyan) !important;
    box-shadow: 0 -10px 40px rgba(0, 0, 0, 0.85) !important;
    z-index: 2000 !important;
  }

  .ai-drawer-header {
    padding: 0.85rem 1rem;
    border-radius: 20px 20px 0 0;
  }

  #ai-expand-btn {
    display: none !important; /* Not needed for full-width bottom drawer */
  }

  .ai-chat-body {
    padding: 0.85rem 1rem;
  }

  .ai-chat-input-row {
    padding: 0.75rem 1rem max(0.75rem, env(safe-area-inset-bottom)) 1rem;
  }

  .ai-chat-input-row textarea {
    font-size: 0.9rem;
  }

  /* Global Search Results Overlay */
  .search-results-overlay {
    margin-bottom: 1rem;
    padding: 1rem 0.85rem;
    border-radius: var(--radius-lg);
  }

  .search-results-grid {
    grid-template-columns: 1fr;
    gap: 0.65rem;
  }
}

/* --------------------------------------------------------------------------
   5. Compact Mobile Devices (<= 480px)
   -------------------------------------------------------------------------- */
@media (max-width: 480px) {
  .global-header {
    padding: 0.65rem 0.75rem;
  }

  .app-title {
    font-size: 0.92rem;
  }

  .logo-icon {
    font-size: 1.25rem;
    padding: 0.25rem;
  }

  .mobile-menu-toggle-btn {
    width: 38px;
    height: 38px;
    font-size: 1.15rem;
  }

  .main-content {
    padding: 0.85rem 0.65rem;
  }

  .domain-card {
    padding: 1rem 0.85rem;
  }

  .recap-topic-card {
    padding: 1rem 0.85rem;
  }

  .recap-topic-title-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.35rem;
  }

  .recap-domain-chip {
    align-self: flex-start;
  }

  .footer-content {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 0.75rem;
  }

  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.75rem;
  }
}

/* ==========================================================================
   Phase 2: Global Universal Command Palette (Cmd + K / Ctrl + K)
   ========================================================================== */
.command-palette-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 10000;
  display: none;
  align-items: flex-start;
  justify-content: center;
  padding-top: 12vh;
  box-sizing: border-box;
  animation: fadeIn 0.15s ease;
}

.command-palette-overlay.show {
  display: flex;
}

.command-palette-dialog {
  width: 92vw;
  max-width: 640px;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  max-height: 72vh;
  animation: slideDownTheme 0.18s cubic-bezier(0.16, 1, 0.3, 1);
}

.cmd-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.85rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-card);
}

.cmd-icon {
  font-size: 1.2rem;
  color: var(--primary);
}

.cmd-input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  font-size: 0.98rem;
  font-weight: 500;
  color: var(--text-main);
  font-family: var(--font-sans);
}

.cmd-input::placeholder {
  color: var(--text-dim);
}

.cmd-close-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 0.2rem;
  line-height: 1;
}

.cmd-close-btn:hover {
  color: var(--text-main);
}

.cmd-body {
  overflow-y: auto;
  padding: 0.65rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  max-height: 52vh;
}

.cmd-group-title {
  font-size: 0.68rem;
  font-weight: 800;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.45rem 0.65rem 0.2rem 0.65rem;
  margin-top: 0.25rem;
}

.cmd-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.6rem 0.85rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  color: var(--text-main);
  text-decoration: none;
  border: 1px solid transparent;
  transition: all 0.15s ease;
  user-select: none;
}

.cmd-item-left {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  min-width: 0;
  flex: 1;
}

.cmd-item-icon {
  font-size: 1.1rem;
  flex-shrink: 0;
}

.cmd-item-title {
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.cmd-item-sub {
  font-size: 0.72rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.cmd-item-right {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-shrink: 0;
}

.cmd-badge {
  font-size: 0.65rem;
  font-weight: 700;
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--primary);
}

.cmd-item:hover,
.cmd-item.selected {
  background: var(--bg-accent-subtle);
  border-color: var(--primary);
  transform: translateX(2px);
}

.cmd-item:hover .cmd-item-title,
.cmd-item.selected .cmd-item-title {
  color: var(--primary);
}

.cmd-empty-state {
  padding: 2rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.cmd-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 1.25rem;
  border-top: 1px solid var(--border-color);
  font-size: 0.72rem;
  color: var(--text-muted);
  background: var(--bg-secondary);
}

.cmd-footer-shortcuts {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.cmd-kbd {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 0.1rem 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--text-main);
}

/* ==========================================================================
   Phase 3: Header Interview Readiness & Mastery Gauge
   ========================================================================== */
.header-mastery-gauge {
  position: relative;
  display: inline-flex;
  align-items: center;
}

.mastery-progress-pill {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 0.35rem 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  transition: all 0.2s ease;
  user-select: none;
}

.mastery-progress-pill:hover {
  border-color: var(--primary);
  box-shadow: 0 0 12px var(--primary-glow);
  background: var(--bg-card-hover);
}

.mastery-gauge-icon {
  font-size: 1rem;
}

.mastery-gauge-text {
  font-size: 0.76rem;
  font-weight: 700;
  color: var(--text-main);
}

.mastery-gauge-pct {
  color: var(--accent-emerald);
}

.mastery-gauge-bar {
  width: 48px;
  height: 5px;
  background: var(--bg-secondary);
  border-radius: 999px;
  overflow: hidden;
  border: 1px solid var(--border-color);
}

.mastery-gauge-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-emerald));
  border-radius: 999px;
  transition: width 0.3s ease;
}

.mastery-popover {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  width: 300px;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 0.85rem 1rem;
  display: none;
  flex-direction: column;
  gap: 0.5rem;
  z-index: 1050;
  animation: slideDownTheme 0.18s cubic-bezier(0.16, 1, 0.3, 1);
}

.mastery-popover.show {
  display: flex;
}

.mastery-popover-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.4rem;
}

.mastery-popover-title {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-main);
}

.mastery-popover-stat {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--accent-emerald);
}

.mastery-popover-list {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  max-height: 220px;
  overflow-y: auto;
}

.mastery-popover-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.74rem;
  color: var(--text-muted);
  padding: 0.2rem 0;
}

.mastery-popover-item strong {
  color: var(--text-main);
}

@media (max-width: 768px) {
  .header-mastery-gauge {
    display: none;
  }
}

/* ==========================================================================
   Interactive Simulator Glassmorphic Modal Dialog
   ========================================================================== */
.simulator-frame-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(4, 6, 11, 0.82);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 2500;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  box-sizing: border-box;
  animation: fadeInModal 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes fadeInModal {
  from { opacity: 0; transform: scale(0.98); }
  to { opacity: 1; transform: scale(1); }
}

.sim-modal-content {
  width: 100%;
  max-width: 1240px;
  height: 90vh;
  background: var(--bg-card);
  border: var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl), 0 0 35px var(--primary-glow);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  position: relative;
}

.sim-modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.9rem 1.4rem;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  gap: 1rem;
}

.sim-modal-title-wrap {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-width: 0;
}

.sim-modal-title {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  font-family: var(--font-display);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sim-close-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.sim-close-btn:hover {
  color: var(--accent-rose);
  border-color: var(--accent-rose);
  background: rgba(244, 63, 94, 0.1);
  transform: scale(1.05);
}

.sim-modal-body {
  flex: 1;
  width: 100%;
  height: calc(100% - 56px);
  position: relative;
  background: var(--bg-primary);
}

.sim-modal-body iframe {
  width: 100%;
  height: 100%;
  border: none;
}