/* ============================================
   MEDVAULT — Liquid Glass Design System
   Inspired by iOS 26 Liquid Glass
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Space+Grotesk:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

/* ─────────────────────────────────────────────
   THEME TOKENS — LIGHT (default)
   ───────────────────────────────────────────── */
:root {
  /* Page */
  --page-bg: #d8dce6;
  --lite-card-bg: #f0f2f7;
  --page-bg-mesh-1: rgba(2, 132, 199, 0.15);
  --page-bg-mesh-2: rgba(3, 105, 161, 0.12);
  --page-bg-mesh-3: rgba(8, 145, 178, 0.08);
  --page-bg-mesh-4: rgba(14, 116, 144, 0.06);

  /* Active accent — changes per subject */
  --accent-active: #7C4DFF;
  --accent-active-soft: rgba(124, 77, 255, 0.12);
  --accent-active-glow: rgba(124, 77, 255, 0.25);
  --accent-active-ring: rgba(124, 77, 255, 0.10);

  /* Glass tint — subtle color added to glass when subject is active */
  --glass-tint: transparent;

  /* Glass */
  --glass-bg: rgba(255, 255, 255, 0.20);
  --glass-bg-hover: rgba(255, 255, 255, 0.35);
  --glass-bg-solid: rgba(255, 255, 255, 0.50);
  --glass-border: rgba(255, 255, 255, 0.55);
  --glass-border-hover: rgba(255, 255, 255, 0.75);
  --glass-highlight: rgba(255, 255, 255, 0.8);
  --glass-shadow: rgba(0, 0, 0, 0.06);
  --glass-shadow-lg: rgba(0, 0, 0, 0.10);
  --glass-blur: 8px;
  --glass-blur-heavy: 16px;
  --glass-saturation: 180%;

  /* Text */
  --text-primary: #1a1a2e;
  --text-secondary: #4a4a6a;
  --text-tertiary: #8888a8;
  --text-muted: #b0b0c8;
  --text-on-accent: #ffffff;

  /* Borders */
  --border-subtle: rgba(0, 0, 0, 0.04);
  --border-default: rgba(0, 0, 0, 0.06);
  --border-hover: rgba(0, 0, 0, 0.10);

  /* Accents */
  --accent-pathology: #2196F3;
  --accent-pathology-soft: rgba(33, 150, 243, 0.12);
  --accent-pathology-glass: rgba(33, 150, 243, 0.08);
  --accent-chemistry: #FF9800;
  --accent-chemistry-soft: rgba(255, 152, 0, 0.12);
  --accent-chemistry-glass: rgba(255, 152, 0, 0.08);
  --accent-haematology: #E53935;
  --accent-haematology-soft: rgba(229, 57, 53, 0.12);
  --accent-haematology-glass: rgba(229, 57, 53, 0.08);
  --accent-microbiology: #00C853;
  --accent-microbiology-soft: rgba(0, 200, 83, 0.12);
  --accent-microbiology-glass: rgba(0, 200, 83, 0.08);
  --accent-pharmacology: #7C4DFF;
  --accent-pharmacology-soft: rgba(124, 77, 255, 0.12);
  --accent-pharmacology-glass: rgba(124, 77, 255, 0.08);

  /* Functional */
  --color-success: #00C853;
  --color-success-bg: rgba(0, 200, 83, 0.10);
  --color-info: #2196F3;
  --color-info-bg: rgba(33, 150, 243, 0.10);

  /* Specular — the bright "sheen" on glass edges */
  --specular-top: rgba(255, 255, 255, 0.9);
  --specular-bottom: rgba(255, 255, 255, 0.0);
  --specular-edge: rgba(255, 255, 255, 0.5);

  /* Noise overlay */
  --noise-opacity: 0.015;

  /* Layout */
  --max-width: 1400px;
  --radius-sm: 10px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 26px;
  --radius-2xl: 30px;
  --radius-full: 9999px;

  /* Typography */
  --font-display: 'Space Grotesk', -apple-system, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Motion */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --dur-fast: 150ms;
  --dur-normal: 300ms;
  --dur-slow: 500ms;

  /* Theme toggle icon */
  --toggle-icon-rotate: 0deg;
}

/* ─────────────────────────────────────────────
   THEME TOKENS — DARK
   ───────────────────────────────────────────── */
[data-theme="dark"] {
  --page-bg: #08080f;
  --lite-card-bg: #16161e;
  --page-bg-mesh-1: rgba(2, 132, 199, 0.25);
  --page-bg-mesh-2: rgba(3, 105, 161, 0.20);
  --page-bg-mesh-3: rgba(8, 145, 178, 0.15);
  --page-bg-mesh-4: rgba(14, 116, 144, 0.12);

  --accent-active: #b388ff;
  --accent-active-soft: rgba(179, 136, 255, 0.15);
  --accent-active-glow: rgba(179, 136, 255, 0.2);
  --accent-active-ring: rgba(179, 136, 255, 0.1);
  --glass-tint: transparent;

  --glass-bg: rgba(255, 255, 255, 0.02);
  --glass-bg-hover: rgba(255, 255, 255, 0.05);
  --glass-bg-solid: rgba(255, 255, 255, 0.06);
  --glass-border: rgba(255, 255, 255, 0.10);
  --glass-border-hover: rgba(255, 255, 255, 0.18);
  --glass-highlight: rgba(255, 255, 255, 0.12);
  --glass-shadow: rgba(0, 0, 0, 0.3);
  --glass-shadow-lg: rgba(0, 0, 0, 0.5);
  --glass-blur: 6px;
  --glass-blur-heavy: 12px;
  --glass-saturation: 140%;

  --text-primary: #f0f0f8;
  --text-secondary: #a0a0c0;
  --text-tertiary: #606080;
  --text-muted: #383850;

  --border-subtle: rgba(255, 255, 255, 0.04);
  --border-default: rgba(255, 255, 255, 0.06);
  --border-hover: rgba(255, 255, 255, 0.12);

  --accent-pathology: #42a5f5;
  --accent-pathology-soft: rgba(66, 165, 245, 0.15);
  --accent-pathology-glass: rgba(66, 165, 245, 0.06);
  --accent-chemistry: #ffb74d;
  --accent-chemistry-soft: rgba(255, 183, 77, 0.15);
  --accent-chemistry-glass: rgba(255, 183, 77, 0.06);
  --accent-haematology: #ef5350;
  --accent-haematology-soft: rgba(239, 83, 80, 0.15);
  --accent-haematology-glass: rgba(239, 83, 80, 0.06);
  --accent-microbiology: #69f0ae;
  --accent-microbiology-soft: rgba(105, 240, 174, 0.15);
  --accent-microbiology-glass: rgba(105, 240, 174, 0.06);
  --accent-pharmacology: #b388ff;
  --accent-pharmacology-soft: rgba(179, 136, 255, 0.15);
  --accent-pharmacology-glass: rgba(179, 136, 255, 0.06);

  --color-success: #69f0ae;
  --color-success-bg: rgba(105, 240, 174, 0.10);
  --color-info: #42a5f5;
  --color-info-bg: rgba(66, 165, 245, 0.10);

  --specular-top: rgba(255, 255, 255, 0.12);
  --specular-bottom: rgba(255, 255, 255, 0.0);
  --specular-edge: rgba(255, 255, 255, 0.06);

  --noise-opacity: 0.025;
  --toggle-icon-rotate: 180deg;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  background: var(--page-bg);
  color: var(--text-secondary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  transition: background var(--dur-slow) var(--ease-out), color var(--dur-slow) var(--ease-out);
}

::selection {
  background: var(--accent-active-ring);
  color: var(--text-primary);
}

/* ─────────────────────────────────────────────
   SCROLLBAR
   ───────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--glass-border);
  border-radius: 10px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--glass-border-hover);
}

/* ─────────────────────────────────────────────
   BACKGROUND
   ───────────────────────────────────────────── */
.mesh-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

#constellation-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}

/* Noise texture overlay — very subtle, no blend mode for perf */
.noise-overlay {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: var(--noise-opacity);
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 256px 256px;
}

/* ─────────────────────────────────────────────
   LIQUID GLASS MIXIN CLASSES
   ───────────────────────────────────────────── */

/* Base glass panel */
.glass {
  background: transparent;
  border: 1px solid var(--glass-border);
  box-shadow:
    0 1px 1px var(--glass-shadow),
    0 8px 24px var(--glass-shadow),
    inset 0 1px 0 var(--specular-top),
    inset 0 -1px 0 var(--specular-bottom);
  transition:
    background var(--dur-normal) var(--ease-out),
    border-color var(--dur-normal) var(--ease-out),
    box-shadow var(--dur-normal) var(--ease-out),
    transform var(--dur-normal) var(--ease-out);
  position: relative;
  overflow: hidden;
  z-index: 1;
}

/* Background Layer for Glass Refraction */
.glass-bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturation));
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturation));
  border-radius: inherit;
  pointer-events: none;
  transition: background var(--dur-normal) var(--ease-out);
}

/* Specular highlight — top edge light refraction */
.glass::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 50%;
  background: linear-gradient(
    180deg,
    var(--specular-top) 0%,
    transparent 100%
  );
  opacity: 0.3;
  pointer-events: none;
  z-index: 1;
  border-radius: inherit;
  transition: opacity var(--dur-normal) var(--ease-out);
}

.glass:hover {
  background: var(--glass-bg-hover);
  border-color: var(--glass-border-hover);
  box-shadow:
    0 2px 4px var(--glass-shadow),
    0 12px 40px var(--glass-shadow-lg),
    inset 0 1px 0 var(--specular-top),
    inset 0 -1px 0 var(--specular-bottom);
  transform: translateY(-2px);
}

.glass:hover::before {
  opacity: 0.45;
}

/* Heavy glass — more opaque, more blur */
.glass-solid {
  background: rgba(255, 255, 255, 0.1);
}

/* Edge illumination is rendered on the canvas layer for maximum performance */

/* ─────────────────────────────────────────────
   APP CONTAINER
   ───────────────────────────────────────────── */
.app-container {
  position: relative;
  z-index: 2;
  min-height: 100vh;
  padding: 16px;
  max-width: var(--max-width);
  margin: 0 auto;
}

@media (min-width: 768px) {
  .app-container { padding: 32px 40px; }
}
@media (min-width: 1200px) {
  .app-container { padding: 40px 56px; }
}

/* ─────────────────────────────────────────────
   HEADER
   ───────────────────────────────────────────── */
.header {
  margin-bottom: 36px;
}

.header-top {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-bottom: 28px;
}

@media (min-width: 768px) {
  .header-top {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-start;
  }
}

.brand { display: flex; flex-direction: column; gap: 8px; }

.brand-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--text-primary);
  line-height: 1.15;
  transition: color var(--dur-slow) var(--ease-out);
}

.brand-subtitle {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.brand-tagline {
  font-size: 0.88rem;
  color: var(--text-tertiary);
  font-weight: 400;
  transition: color var(--dur-slow) var(--ease-out);
}

.stat-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--accent-active);
  padding: 4px 14px;
  border-radius: var(--radius-full);
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  transition: background-color var(--dur-slow) var(--ease-out), border-color var(--dur-slow) var(--ease-out), color var(--dur-slow) var(--ease-out);
}

.stat-dot {
  width: 6px; height: 6px;
  background: var(--accent-active);
  border-radius: 50%;
  animation: pulse 2.5s ease-in-out infinite;
}

/* Changelog + theme toggle cluster */
.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  font-family: var(--font-body);
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--text-tertiary);
  padding: 7px 14px;
  border-radius: var(--radius-full);
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  cursor: pointer;
  transition: all var(--dur-normal) var(--ease-out);
  transition-property: background-color, border-color, color, fill, stroke, opacity, box-shadow, transform, filter;
}

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

.icon-btn:active { transform: scale(0.95); }

/* Theme toggle */
.theme-toggle {
  width: 38px; height: 38px;
  padding: 0;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0;
}

.theme-toggle svg {
  transition: transform var(--dur-slow) var(--ease-spring);
  transform: rotate(var(--toggle-icon-rotate));
}

/* ─────────────────────────────────────────────
   SEARCH
   ───────────────────────────────────────────── */
.search-area {
  display: flex;
  align-items: center;
  gap: 10px;
}

.search-container {
  position: relative;
  width: 100%;
  max-width: 380px;
}

.search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
  z-index: 1;
  transition: color var(--dur-normal) var(--ease-out);
}

.search-input {
  width: 100%;
  padding: 11px 60px 11px 42px;
  font-family: var(--font-body);
  font-size: 0.88rem;
  color: var(--text-primary);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  outline: none;
  backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturation));
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturation));
  box-shadow: inset 0 1px 0 var(--specular-top);
  transition: all var(--dur-normal) var(--ease-out);
  transition-property: background-color, border-color, color, fill, stroke, opacity, box-shadow, transform, filter;
}

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

.search-input:hover {
  border-color: var(--glass-border-hover);
  background: var(--glass-bg-hover);
}

.search-input:focus {
  border-color: var(--accent-active);
  box-shadow:
    0 0 0 3px var(--accent-active-ring),
    inset 0 1px 0 var(--specular-top);
}

.search-input:focus ~ .search-icon {
  color: var(--accent-active);
}

.search-shortcut {
  position: absolute;
  right: 12px; top: 50%;
  transform: translateY(-50%);
  display: none;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  color: var(--text-muted);
  background: var(--glass-bg-solid);
  padding: 3px 8px;
  border-radius: 6px;
  border: 1px solid var(--border-subtle);
  pointer-events: none;
}

@media (min-width: 768px) {
  .search-shortcut { display: block; }
}

/* ─────────────────────────────────────────────
   FILTER PILLS
   ───────────────────────────────────────────── */
.filters {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-subtle);
  scrollbar-width: none;
  -ms-overflow-style: none;
  transition: border-color var(--dur-slow) var(--ease-out);
}
.filters::-webkit-scrollbar { display: none; }

.filter-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  padding: 8px 18px;
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 500;
  border-radius: var(--radius-full);
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  color: var(--text-secondary);
  cursor: pointer;
  transition: background-color var(--dur-normal) var(--ease-out), border-color var(--dur-normal) var(--ease-out), color var(--dur-normal) var(--ease-out), transform var(--dur-normal) var(--ease-out), box-shadow var(--dur-normal) var(--ease-out);
  flex-shrink: 0;
}

.filter-pill:hover {
  background: var(--glass-bg-hover);
  border-color: var(--glass-border-hover);
  color: var(--text-primary);
  transform: translateY(-1px);
}
.filter-pill:active { transform: scale(0.96); }

.filter-pill.active {
  border-color: transparent;
  font-weight: 600;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

.filter-pill.active-all {
  background: var(--text-primary);
  color: var(--page-bg);
}

.pill-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.filter-pill.active-pathology { background: var(--accent-pathology); color: #fff; }
.filter-pill.active-chemistry { background: var(--accent-chemistry); color: #1a1a2e; }
.filter-pill.active-haematology { background: var(--accent-haematology); color: #fff; }
.filter-pill.active-microbiology { background: var(--accent-microbiology); color: #1a1a2e; }
.filter-pill.active-pharmacology { background: var(--accent-pharmacology); color: #fff; }

/* ─────────────────────────────────────────────
   CONTENT
   ───────────────────────────────────────────── */
.content-area { margin-top: 28px; }

.subject-section { margin-bottom: 56px; }

.subject-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 22px;
}

.subject-icon-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 46px; height: 46px;
  border-radius: var(--radius-md);
  flex-shrink: 0;
  transition: all var(--dur-slow) var(--ease-out);
  transition-property: background-color, border-color, color, fill, stroke, opacity, box-shadow, transform, filter;
}

.subject-icon-wrap.pathology { background: var(--accent-pathology-soft); color: var(--accent-pathology); }
.subject-icon-wrap.chemistry { background: var(--accent-chemistry-soft); color: var(--accent-chemistry); }
.subject-icon-wrap.haematology { background: var(--accent-haematology-soft); color: var(--accent-haematology); }
.subject-icon-wrap.microbiology { background: var(--accent-microbiology-soft); color: var(--accent-microbiology); }
.subject-icon-wrap.pharmacology { background: var(--accent-pharmacology-soft); color: var(--accent-pharmacology); }

.subject-title {
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 2.5vw, 1.4rem);
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  transition: color var(--dur-slow) var(--ease-out);
}

/* ─────────────────────────────────────────────
   CARDS GRID
   ───────────────────────────────────────────── */
.cards-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}
@media (min-width: 1024px) {
  .cards-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ─────────────────────────────────────────────
   INSTRUCTOR CARD — LIQUID GLASS
   ───────────────────────────────────────────── */
.instructor-card {
  border-radius: var(--radius-xl);
  display: flex;
  flex-direction: column;
  box-shadow: 0 1px 1px var(--glass-shadow), 0 8px 24px var(--glass-shadow);
}

.instructor-card:hover {
  box-shadow: 0 2px 4px var(--glass-shadow), 0 12px 40px var(--glass-shadow-lg);
}

/* Remove the glass::before overlay completely for cards to disable edge lighting */
.instructor-card::before {
  display: none;
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 22px;
  border-bottom: 1px solid var(--border-subtle);
  background: var(--glass-bg);
  position: relative;
  z-index: 3;
  transition: background var(--dur-slow) var(--ease-out), border-color var(--dur-slow) var(--ease-out);
}

.card-instructor {
  font-family: var(--font-display);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary);
  transition: color var(--dur-slow) var(--ease-out);
}

.card-count {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 500;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  background: var(--glass-bg-solid);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  transition: all var(--dur-slow) var(--ease-out);
  transition-property: background-color, border-color, color, fill, stroke, opacity, box-shadow, transform, filter;
}

/* ─────────────────────────────────────────────
   TOPIC LIST
   ───────────────────────────────────────────── */
.topic-list {
  flex: 1;
  max-height: 430px;
  overflow-y: auto;
  padding: 4px 0;
  position: relative;
  z-index: 3;
}

.topic-item {
  padding: 14px 22px;
  transition: background var(--dur-fast) var(--ease-out);
}

.topic-item:hover {
  background: var(--glass-bg);
}

.topic-title {
  font-size: 0.84rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 8px;
  line-height: 1.5;
  display: flex;
  align-items: flex-start;
  gap: 10px;
  transition: color var(--dur-slow) var(--ease-out);
}

.status-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  margin-top: 6px;
  flex-shrink: 0;
  transition: all var(--dur-slow) var(--ease-out);
  transition-property: background-color, border-color, color, fill, stroke, opacity, box-shadow, transform, filter;
}

.status-dot.full {
  background: var(--color-success);
  box-shadow: 0 0 8px rgba(0, 200, 83, 0.4);
}
.status-dot.partial {
  background: var(--accent-chemistry);
  box-shadow: 0 0 6px rgba(255, 152, 0, 0.3);
}
.status-dot.none {
  background: var(--text-muted);
}

/* ─────────────────────────────────────────────
   RESOURCE BUTTONS
   ───────────────────────────────────────────── */
.resource-buttons {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-left: 17px;
}

.resource-buttons > * {
  flex-shrink: 0;
}

.resource-btn-group {
  display: flex;
  align-items: stretch;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  transition: border-color var(--dur-normal) var(--ease-out), box-shadow var(--dur-normal) var(--ease-out), transform var(--dur-normal) var(--ease-out);
}

.resource-btn-group:hover {
  border-color: var(--glass-border-hover);
  box-shadow: 0 2px 8px var(--glass-shadow);
  transform: translateY(-1px);
}

.resource-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 12px;
  font-family: var(--font-body);
  font-size: 0.72rem;
  font-weight: 500;
  text-decoration: none;
  transition: all var(--dur-fast) var(--ease-out);
  transition-property: background-color, border-color, color, fill, stroke, opacity, box-shadow, transform, filter;
}

.resource-link.gdoc { color: var(--color-success); }
.resource-link.gdoc:hover { background: var(--color-success-bg); }
.resource-link.nlm { color: var(--color-info); }
.resource-link.nlm:hover { background: var(--color-info-bg); }

.copy-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 5px 9px;
  background: transparent;
  border: none;
  border-left: 1px solid var(--border-subtle);
  cursor: pointer;
  transition: all var(--dur-fast) var(--ease-out);
  transition-property: background-color, border-color, color, fill, stroke, opacity, box-shadow, transform, filter;
}
.copy-btn.gdoc { color: var(--color-success); }
.copy-btn.gdoc:hover { background: var(--color-success-bg); }
.copy-btn.nlm { color: var(--color-info); }
.copy-btn.nlm:hover { background: var(--color-info-bg); }
.copy-btn:active { transform: scale(0.88); }

.add-link-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 12px;
  font-family: var(--font-body);
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--text-muted);
  background: transparent;
  border: 1px dashed var(--border-default);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--dur-normal) var(--ease-out);
  transition-property: background-color, border-color, color, fill, stroke, opacity, box-shadow, transform, filter;
}

.add-link-btn:hover {
  color: var(--text-secondary);
  border-color: var(--border-hover);
  background: var(--glass-bg);
}

.add-link-btn.gdoc:hover { color: var(--color-success); border-color: var(--color-success); background: var(--color-success-bg); }
.add-link-btn.nlm:hover { color: var(--color-info); border-color: var(--color-info); background: var(--color-info-bg); }

/* ── Mobile: compact resource buttons so Docs + NotebookLM fit on one row ── */
@media (max-width: 480px) {
  .topic-item { padding: 12px 14px; }
  .resource-buttons { margin-left: 10px; gap: 6px; }
  .resource-link { padding: 4px 8px; font-size: 0.68rem; gap: 4px; }
  .copy-btn { padding: 4px 6px; }
  .add-link-btn { padding: 4px 8px; font-size: 0.68rem; gap: 4px; }
}

/* ─────────────────────────────────────────────
   EMPTY STATE
   ───────────────────────────────────────────── */
.empty-state {
  text-align: center;
  padding: 64px 32px;
  border-radius: var(--radius-xl);
}

.empty-state-icon { color: var(--text-muted); margin-bottom: 16px; }

.empty-state h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.empty-state p {
  font-size: 0.88rem;
  color: var(--text-tertiary);
}

/* ─────────────────────────────────────────────
   MODALS — LIQUID GLASS
   ───────────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  background: rgba(0, 0, 0, 0.25);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

[data-theme="dark"] .modal-overlay {
  background: rgba(0, 0, 0, 0.5);
}

.modal-panel {
  width: 100%;
  max-width: 480px;
  border-radius: var(--radius-2xl);
  overflow: hidden;
  background: transparent;
  border: 1px solid var(--glass-border);
  box-shadow:
    0 24px 80px var(--glass-shadow-lg),
    inset 0 1px 0 var(--specular-top);
  z-index: 1;
  position: relative;
}

.modal-panel .glass-bg {
  background: var(--glass-bg-solid);
  backdrop-filter: blur(var(--glass-blur-heavy)) saturate(200%);
  -webkit-backdrop-filter: blur(var(--glass-blur-heavy)) saturate(200%);
}

.modal-panel.wide { max-width: 560px; }

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-subtle);
  background: var(--glass-bg);
}

.modal-title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.modal-close {
  width: 32px; height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--glass-bg);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-tertiary);
  cursor: pointer;
  transition: all var(--dur-fast) var(--ease-out);
  transition-property: background-color, border-color, color, fill, stroke, opacity, box-shadow, transform, filter;
}
.modal-close:hover { background: var(--glass-bg-hover); color: var(--text-primary); }
.modal-close:active { transform: scale(0.9); }

.modal-body {
  padding: 24px;
  max-height: 60vh;
  overflow-y: auto;
}

/* Link modal */
.link-modal-title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.link-modal-desc {
  font-size: 0.84rem;
  color: var(--text-tertiary);
  margin-bottom: 20px;
}

.link-input {
  width: 100%;
  padding: 12px 16px;
  font-family: var(--font-body);
  font-size: 0.88rem;
  color: var(--text-primary);
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  outline: none;
  transition: all var(--dur-normal) var(--ease-out);
  transition-property: background-color, border-color, color, fill, stroke, opacity, box-shadow, transform, filter;
  margin-bottom: 20px;
  box-shadow: inset 0 1px 0 var(--specular-top);
}
.link-input::placeholder { color: var(--text-muted); }
.link-input:focus {
  border-color: var(--accent-active);
  box-shadow: 0 0 0 3px var(--accent-active-ring), inset 0 1px 0 var(--specular-top);
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}

.btn {
  padding: 9px 20px;
  font-family: var(--font-body);
  font-size: 0.84rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--dur-normal) var(--ease-out);
  transition-property: background-color, border-color, color, fill, stroke, opacity, box-shadow, transform, filter;
}
.btn:active { transform: scale(0.96); }

.btn-ghost {
  color: var(--text-secondary);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
}
.btn-ghost:hover { background: var(--glass-bg-hover); }

.btn-primary {
  color: #fff;
  background: var(--accent-active);
  font-weight: 600;
}
.btn-primary:hover {
  filter: brightness(1.1);
  box-shadow: 0 4px 16px var(--accent-active-glow);
}

/* ─────────────────────────────────────────────
   CHANGELOG TIMELINE
   ───────────────────────────────────────────── */
.timeline {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.timeline-item {
  position: relative;
  padding-left: 22px;
  border-left: 2px solid var(--glass-border);
}

.timeline-dot {
  position: absolute;
  left: -5px; top: 6px;
  width: 8px; height: 8px;
  background: var(--accent-active);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--accent-active-glow);
}

.timeline-date {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--text-primary);
  font-size: 0.9rem;
}

.timeline-link {
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--accent-active);
  text-decoration: none;
  margin-left: 12px;
}
.timeline-link:hover { text-decoration: underline; }

.timeline-changes {
  list-style: none;
  margin-top: 8px;
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.timeline-change {
  font-size: 0.84rem;
  color: var(--text-secondary);
  display: flex;
  align-items: flex-start;
  gap: 8px;
}
.timeline-change::before {
  content: '';
  width: 4px; height: 4px;
  border-radius: 50%;
  background: var(--accent-active);
  opacity: 0.5;
  margin-top: 8px;
  flex-shrink: 0;
}

/* ─────────────────────────────────────────────
   LOADER / ERROR / MUTED
   ───────────────────────────────────────────── */
.loader-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 40px 0;
  gap: 14px;
}

.loader {
  width: 28px; height: 28px;
  border: 2px solid var(--glass-border);
  border-top: 2px solid var(--accent-active);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.loader-text { font-size: 0.84rem; color: var(--text-tertiary); }
.error-text { color: var(--accent-haematology); font-size: 0.84rem; text-align: center; padding: 24px 0; }
.muted-text { color: var(--text-tertiary); font-size: 0.84rem; text-align: center; padding: 24px 0; }

/* ─────────────────────────────────────────────
   TOAST
   ───────────────────────────────────────────── */
.toast {
  position: fixed;
  bottom: 28px; left: 50%;
  z-index: 200;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  font-family: var(--font-body);
  font-size: 0.84rem;
  font-weight: 500;
  color: var(--text-primary);
  background: transparent;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full);
  box-shadow: 0 12px 40px var(--glass-shadow-lg);
  pointer-events: none;
  overflow: hidden;
  transition: opacity var(--dur-slow) var(--ease-out), transform var(--dur-slow) var(--ease-out);
}

.toast .glass-bg {
  background: var(--glass-bg-solid);
  backdrop-filter: blur(var(--glass-blur-heavy)) saturate(200%);
  -webkit-backdrop-filter: blur(var(--glass-blur-heavy)) saturate(200%);
}

.toast.visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}
.toast.hidden {
  opacity: 0;
  transform: translateX(-50%) translateY(14px);
}

.toast-icon { color: var(--color-success); }

/* ─────────────────────────────────────────────
   REQUEST UPDATE FORM
   ───────────────────────────────────────────── */
.request-btn {
  color: var(--accent-active) !important;
  border-color: var(--accent-active-ring) !important;
  background: var(--accent-active-soft) !important;
}
.request-btn:hover {
  background: var(--accent-active-glow) !important;
  border-color: var(--accent-active) !important;
}

.request-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.request-form-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.request-field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.request-label {
  font-family: var(--font-display);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-primary);
}

.request-optional {
  font-weight: 400;
  color: var(--text-tertiary);
  font-family: var(--font-body);
}

.request-type-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.request-type-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 7px 14px;
  font-family: var(--font-body);
  font-size: 0.76rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: background-color var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out), transform var(--dur-fast) var(--ease-out);
}

.request-type-btn:hover {
  background: var(--glass-bg-hover);
  border-color: var(--glass-border-hover);
  color: var(--text-primary);
}

.request-type-btn:active {
  transform: scale(0.96);
}

.request-type-btn.active {
  background: var(--accent-active-soft);
  border-color: var(--accent-active);
  color: var(--accent-active);
  font-weight: 600;
}

.request-textarea {
  width: 100%;
  padding: 12px 16px;
  font-family: var(--font-body);
  font-size: 0.88rem;
  color: var(--text-primary);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  outline: none;
  resize: vertical;
  min-height: 80px;
  max-height: 200px;
  line-height: 1.6;
  transition: border-color var(--dur-normal) var(--ease-out), box-shadow var(--dur-normal) var(--ease-out);
  box-shadow: inset 0 1px 0 var(--specular-top);
}

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

.request-textarea:focus {
  border-color: var(--accent-active);
  box-shadow: 0 0 0 3px var(--accent-active-ring), inset 0 1px 0 var(--specular-top);
}

.request-success {
  text-align: center;
  padding: 32px 16px;
}

.request-success-icon {
  font-size: 2.5rem;
  margin-bottom: 12px;
}

.request-success-title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.request-success-text {
  font-size: 0.88rem;
  color: var(--text-tertiary);
}

/* ─────────────────────────────────────────────
   FOOTER
   ───────────────────────────────────────────── */
.footer {
  margin-top: 64px;
  padding: 24px 0;
  border-top: 1px solid var(--border-subtle);
  text-align: center;
  transition: border-color var(--dur-slow) var(--ease-out);
}

.footer-text { font-size: 0.78rem; color: var(--text-muted); }
.footer-link { color: var(--text-tertiary); text-decoration: none; transition: color var(--dur-fast); }
.footer-link:hover { color: var(--text-secondary); }

/* ─────────────────────────────────────────────
   KEYFRAMES
   ───────────────────────────────────────────── */
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ─────────────────────────────────────────────
   SUBJECT ATMOSPHERE — per-course color shift
   Orbs, glass tint, accent, search ring all morph
   ───────────────────────────────────────────── */

/* ── Anatomical Pathology (Blue) ── */
[data-subject="pathology"] {
  --page-bg-mesh-1: rgba(33, 150, 243, 0.22);
  --page-bg-mesh-2: rgba(66, 165, 245, 0.16);
  --page-bg-mesh-3: rgba(3, 169, 244, 0.12);
  --page-bg-mesh-4: rgba(100, 180, 255, 0.10);
  --accent-active: var(--accent-pathology);
  --accent-active-soft: var(--accent-pathology-soft);
  --accent-active-glow: rgba(33, 150, 243, 0.25);
  --accent-active-ring: rgba(33, 150, 243, 0.12);
  --glass-tint: rgba(33, 150, 243, 0.02);
}
[data-theme="dark"][data-subject="pathology"] {
  --page-bg-mesh-1: rgba(33, 150, 243, 0.14);
  --page-bg-mesh-2: rgba(66, 165, 245, 0.10);
  --page-bg-mesh-3: rgba(3, 169, 244, 0.07);
  --page-bg-mesh-4: rgba(100, 180, 255, 0.05);
  --accent-active: var(--accent-pathology);
  --accent-active-soft: var(--accent-pathology-soft);
  --accent-active-glow: rgba(66, 165, 245, 0.2);
  --accent-active-ring: rgba(66, 165, 245, 0.1);
  --glass-tint: rgba(66, 165, 245, 0.015);
}

/* ── Chemical Pathology (Amber) ── */
[data-subject="chemistry"] {
  --page-bg-mesh-1: rgba(255, 152, 0, 0.20);
  --page-bg-mesh-2: rgba(255, 183, 77, 0.16);
  --page-bg-mesh-3: rgba(255, 193, 7, 0.12);
  --page-bg-mesh-4: rgba(255, 167, 38, 0.09);
  --accent-active: var(--accent-chemistry);
  --accent-active-soft: var(--accent-chemistry-soft);
  --accent-active-glow: rgba(255, 152, 0, 0.25);
  --accent-active-ring: rgba(255, 152, 0, 0.12);
  --glass-tint: rgba(255, 152, 0, 0.02);
}
[data-theme="dark"][data-subject="chemistry"] {
  --page-bg-mesh-1: rgba(255, 152, 0, 0.12);
  --page-bg-mesh-2: rgba(255, 183, 77, 0.09);
  --page-bg-mesh-3: rgba(255, 193, 7, 0.06);
  --page-bg-mesh-4: rgba(255, 167, 38, 0.05);
  --accent-active: var(--accent-chemistry);
  --accent-active-soft: var(--accent-chemistry-soft);
  --accent-active-glow: rgba(255, 183, 77, 0.2);
  --accent-active-ring: rgba(255, 183, 77, 0.1);
  --glass-tint: rgba(255, 183, 77, 0.015);
}

/* ── Haematology (Red/Crimson) ── */
[data-subject="haematology"] {
  --page-bg-mesh-1: rgba(229, 57, 53, 0.18);
  --page-bg-mesh-2: rgba(244, 67, 54, 0.14);
  --page-bg-mesh-3: rgba(239, 83, 80, 0.10);
  --page-bg-mesh-4: rgba(255, 82, 82, 0.08);
  --accent-active: var(--accent-haematology);
  --accent-active-soft: var(--accent-haematology-soft);
  --accent-active-glow: rgba(229, 57, 53, 0.25);
  --accent-active-ring: rgba(229, 57, 53, 0.12);
  --glass-tint: rgba(229, 57, 53, 0.02);
}
[data-theme="dark"][data-subject="haematology"] {
  --page-bg-mesh-1: rgba(239, 83, 80, 0.13);
  --page-bg-mesh-2: rgba(244, 67, 54, 0.09);
  --page-bg-mesh-3: rgba(229, 57, 53, 0.06);
  --page-bg-mesh-4: rgba(255, 82, 82, 0.05);
  --accent-active: var(--accent-haematology);
  --accent-active-soft: var(--accent-haematology-soft);
  --accent-active-glow: rgba(239, 83, 80, 0.2);
  --accent-active-ring: rgba(239, 83, 80, 0.1);
  --glass-tint: rgba(239, 83, 80, 0.015);
}

/* ── Medical Microbiology (Green/Emerald) ── */
[data-subject="microbiology"] {
  --page-bg-mesh-1: rgba(0, 200, 83, 0.18);
  --page-bg-mesh-2: rgba(105, 240, 174, 0.14);
  --page-bg-mesh-3: rgba(0, 230, 118, 0.10);
  --page-bg-mesh-4: rgba(76, 175, 80, 0.09);
  --accent-active: var(--accent-microbiology);
  --accent-active-soft: var(--accent-microbiology-soft);
  --accent-active-glow: rgba(0, 200, 83, 0.25);
  --accent-active-ring: rgba(0, 200, 83, 0.12);
  --glass-tint: rgba(0, 200, 83, 0.02);
}
[data-theme="dark"][data-subject="microbiology"] {
  --page-bg-mesh-1: rgba(105, 240, 174, 0.12);
  --page-bg-mesh-2: rgba(0, 200, 83, 0.09);
  --page-bg-mesh-3: rgba(0, 230, 118, 0.06);
  --page-bg-mesh-4: rgba(76, 175, 80, 0.04);
  --accent-active: var(--accent-microbiology);
  --accent-active-soft: var(--accent-microbiology-soft);
  --accent-active-glow: rgba(105, 240, 174, 0.2);
  --accent-active-ring: rgba(105, 240, 174, 0.1);
  --glass-tint: rgba(105, 240, 174, 0.015);
}

/* ── Pharmacology (Purple/Violet) — default ── */
[data-subject="pharmacology"] {
  --page-bg-mesh-1: rgba(124, 77, 255, 0.20);
  --page-bg-mesh-2: rgba(179, 136, 255, 0.16);
  --page-bg-mesh-3: rgba(149, 117, 205, 0.12);
  --page-bg-mesh-4: rgba(103, 58, 183, 0.09);
  --accent-active: var(--accent-pharmacology);
  --accent-active-soft: var(--accent-pharmacology-soft);
  --accent-active-glow: rgba(124, 77, 255, 0.25);
  --accent-active-ring: rgba(124, 77, 255, 0.12);
  --glass-tint: rgba(124, 77, 255, 0.02);
}
[data-theme="dark"][data-subject="pharmacology"] {
  --page-bg-mesh-1: rgba(179, 136, 255, 0.13);
  --page-bg-mesh-2: rgba(124, 77, 255, 0.10);
  --page-bg-mesh-3: rgba(149, 117, 205, 0.06);
  --page-bg-mesh-4: rgba(103, 58, 183, 0.05);
  --accent-active: var(--accent-pharmacology);
  --accent-active-soft: var(--accent-pharmacology-soft);
  --accent-active-glow: rgba(179, 136, 255, 0.2);
  --accent-active-ring: rgba(179, 136, 255, 0.1);
  --glass-tint: rgba(179, 136, 255, 0.015);
}

/* Apply glass tint to cards when a subject is active */
[data-subject] .instructor-card {
  background: color-mix(in srgb, var(--glass-bg), var(--glass-tint));
}
[data-subject] .instructor-card:hover {
  background: color-mix(in srgb, var(--glass-bg-hover), var(--glass-tint));
}

/* Tint the card header */
[data-subject] .card-header {
  background: color-mix(in srgb, var(--glass-bg), var(--glass-tint));
}

/* Active subject tinted search */
[data-subject] .search-input:focus {
  border-color: var(--accent-active);
  box-shadow:
    0 0 0 3px var(--accent-active-ring),
    inset 0 1px 0 var(--specular-top);
}



/* ─────────────────────────────────────────────
   EASTER EGG VISUAL REWARD
   ───────────────────────────────────────────── */
body.easter-egg .mesh-bg .orb {
  animation-duration: 4s !important; /* Speed up drastically */
  opacity: 0.8 !important; /* Make much more vibrant */
}

body.easter-egg .mesh-bg .orb-1 { background: radial-gradient(circle, #ff0055 0%, transparent 60%) !important; }
body.easter-egg .mesh-bg .orb-2 { background: radial-gradient(circle, #00ffaa 0%, transparent 60%) !important; }
body.easter-egg .mesh-bg .orb-3 { background: radial-gradient(circle, #5500ff 0%, transparent 60%) !important; }
body.easter-egg .mesh-bg .orb-4 { background: radial-gradient(circle, #ffff00 0%, transparent 60%) !important; }