/* ===== REALWORLD ACADEMY — Design System ===== */

:root {
  /* Colors */
  --bg: #f0f4f8;
  --surface: #ffffff;
  --surface-2: #f8fafc;
  --border: #e2e8f0;
  --text: #0f172a;
  --text-muted: #64748b;
  --text-light: #94a3b8;

  /* Brand */
  --primary: #4f46e5;
  --primary-light: #eef2ff;
  --primary-dark: #3730a3;

  /* Category Colors */
  --finance:    #059669;
  --finance-bg: #ecfdf5;
  --psych:      #7c3aed;
  --psych-bg:   #f5f3ff;
  --philosophy: #0891b2;
  --phil-bg:    #ecfeff;
  --science:    #2563eb;
  --sci-bg:     #eff6ff;
  --geo:        #16a34a;
  --geo-bg:     #f0fdf4;
  --history:    #b45309;
  --hist-bg:    #fffbeb;
  --health:     #dc2626;
  --health-bg:  #fef2f2;
  --meditate:   #6d28d9;
  --med-bg:     #faf5ff;
  --puzzles:    #d97706;
  --puz-bg:     #fffbeb;
  --books:      #92400e;
  --books-bg:   #fef3c7;
  --home:       #0d9488;
  --home-bg:    #f0fdfa;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;

  /* Typography */
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Radius */
  --radius-sm: 0.375rem;
  --radius: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,.07), 0 1px 2px rgba(0,0,0,.05);
  --shadow: 0 4px 12px rgba(0,0,0,.08), 0 2px 4px rgba(0,0,0,.04);
  --shadow-lg: 0 10px 30px rgba(0,0,0,.1), 0 4px 8px rgba(0,0,0,.06);
  --shadow-card: 0 0 0 1px var(--border), var(--shadow);
}

/* ===== RESET ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { cursor: pointer; font-family: inherit; }

/* ===== TYPOGRAPHY ===== */
h1 { font-size: clamp(2rem, 5vw, 3.5rem); font-weight: 800; line-height: 1.15; letter-spacing: -0.03em; }
h2 { font-size: clamp(1.5rem, 3vw, 2.25rem); font-weight: 700; line-height: 1.2; letter-spacing: -0.02em; }
h3 { font-size: 1.25rem; font-weight: 600; line-height: 1.3; }
h4 { font-size: 1rem; font-weight: 600; }
p { color: var(--text-muted); line-height: 1.75; }
p.lead { font-size: 1.125rem; color: var(--text-muted); }

/* ===== NAVIGATION ===== */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-6);
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}
.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 800;
  font-size: 1.125rem;
  color: var(--primary);
  white-space: nowrap;
}
.nav-brand .logo { font-size: 1.5rem; }
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  flex-wrap: nowrap;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  list-style: none;
}
.nav-links::-webkit-scrollbar { display: none; }
.nav-links a {
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  white-space: nowrap;
  transition: all 0.15s;
}
.nav-links a:hover { background: var(--primary-light); color: var(--primary); }
.nav-links a.active { background: var(--primary-light); color: var(--primary); font-weight: 600; }

/* ===== LAYOUT ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}
.section { padding: var(--space-16) 0; }
.section + .section { padding-top: 0; }

/* ===== HERO ===== */
.hero {
  padding: var(--space-16) 0 var(--space-12);
  text-align: center;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 60% at 50% -10%, rgba(79,70,229,0.1) 0%, transparent 70%);
  pointer-events: none;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-4);
  background: var(--primary-light);
  color: var(--primary);
  border-radius: 100px;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: var(--space-6);
  border: 1px solid rgba(79,70,229,0.2);
}
.hero h1 { margin-bottom: var(--space-6); max-width: 800px; margin-left: auto; margin-right: auto; }
.hero h1 span { color: var(--primary); }
.hero p.lead { max-width: 600px; margin: 0 auto var(--space-8); }
.hero-actions { display: flex; gap: var(--space-4); justify-content: center; flex-wrap: wrap; }

/* ===== PAGE HERO (Category Pages) ===== */
.page-hero {
  padding: var(--space-12) 0 var(--space-8);
}
.page-hero .breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
  font-size: 0.875rem;
  color: var(--text-muted);
}
.page-hero .breadcrumb a { color: var(--primary); }
.page-hero .breadcrumb span { color: var(--text-light); }
.page-hero-icon {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  margin-bottom: var(--space-4);
}
.page-hero h1 { font-size: clamp(2rem, 4vw, 2.75rem); margin-bottom: var(--space-4); }
.page-hero p.lead { max-width: 700px; }

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.625rem 1.25rem;
  border-radius: var(--radius);
  font-size: 0.9375rem;
  font-weight: 600;
  border: none;
  transition: all 0.2s;
  line-height: 1;
}
.btn-primary {
  background: var(--primary);
  color: white;
  box-shadow: 0 4px 14px rgba(79,70,229,0.3);
}
.btn-primary:hover {
  background: var(--primary-dark);
  box-shadow: 0 6px 20px rgba(79,70,229,0.4);
  transform: translateY(-1px);
}
.btn-outline {
  background: white;
  color: var(--text);
  border: 1.5px solid var(--border);
}
.btn-outline:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-light); }
.btn-ghost { background: transparent; color: var(--text-muted); }
.btn-ghost:hover { background: var(--surface-2); color: var(--text); }
.btn-lg { padding: 0.875rem 2rem; font-size: 1rem; border-radius: var(--radius-lg); }

/* ===== CARDS ===== */
.card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  transition: all 0.2s;
}
.card:hover { box-shadow: var(--shadow-lg); transform: translateY(-2px); }
.card-body { padding: var(--space-6); }
.card-header { padding: var(--space-6); border-bottom: 1px solid var(--border); }

/* ===== CATEGORY CARDS (Home) ===== */
.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-6);
}
.cat-card {
  background: var(--surface);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  box-shadow: var(--shadow-card);
  transition: all 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  position: relative;
  overflow: hidden;
}
.cat-card::after {
  content: '';
  position: absolute;
  top: 0; right: 0;
  width: 80px; height: 80px;
  border-radius: 0 var(--radius-xl) 0 80px;
  opacity: 0.07;
  transition: opacity 0.2s;
}
.cat-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px) scale(1.01); }
.cat-card:hover::after { opacity: 0.12; }
.cat-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.625rem;
  flex-shrink: 0;
}
.cat-card h3 { font-size: 1.125rem; color: var(--text); }
.cat-card p { font-size: 0.9rem; line-height: 1.6; flex: 1; }
.cat-tags { display: flex; flex-wrap: wrap; gap: var(--space-2); }
.tag {
  padding: 2px 10px;
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 500;
}
.cat-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.875rem;
  font-weight: 600;
  margin-top: var(--space-2);
  transition: gap 0.2s;
}
.cat-card:hover .cat-link { gap: var(--space-3); }

/* Category theming */
.cat-finance .cat-icon { background: var(--finance-bg); }
.cat-finance .cat-icon, .cat-finance .cat-link { color: var(--finance); }
.cat-finance .tag { background: var(--finance-bg); color: var(--finance); }
.cat-finance::after { background: var(--finance); }

.cat-psych .cat-icon { background: var(--psych-bg); }
.cat-psych .cat-icon, .cat-psych .cat-link { color: var(--psych); }
.cat-psych .tag { background: var(--psych-bg); color: var(--psych); }
.cat-psych::after { background: var(--psych); }

.cat-phil .cat-icon { background: var(--phil-bg); }
.cat-phil .cat-icon, .cat-phil .cat-link { color: var(--philosophy); }
.cat-phil .tag { background: var(--phil-bg); color: var(--philosophy); }
.cat-phil::after { background: var(--philosophy); }

.cat-science .cat-icon { background: var(--sci-bg); }
.cat-science .cat-icon, .cat-science .cat-link { color: var(--science); }
.cat-science .tag { background: var(--sci-bg); color: var(--science); }
.cat-science::after { background: var(--science); }

.cat-geo .cat-icon { background: var(--geo-bg); }
.cat-geo .cat-icon, .cat-geo .cat-link { color: var(--geo); }
.cat-geo .tag { background: var(--geo-bg); color: var(--geo); }
.cat-geo::after { background: var(--geo); }

.cat-history .cat-icon { background: var(--hist-bg); }
.cat-history .cat-icon, .cat-history .cat-link { color: var(--history); }
.cat-history .tag { background: var(--hist-bg); color: var(--history); }
.cat-history::after { background: var(--history); }

.cat-health .cat-icon { background: var(--health-bg); }
.cat-health .cat-icon, .cat-health .cat-link { color: var(--health); }
.cat-health .tag { background: var(--health-bg); color: var(--health); }
.cat-health::after { background: var(--health); }

.cat-med .cat-icon { background: var(--med-bg); }
.cat-med .cat-icon, .cat-med .cat-link { color: var(--meditate); }
.cat-med .tag { background: var(--med-bg); color: var(--meditate); }
.cat-med::after { background: var(--meditate); }

.cat-puz .cat-icon { background: var(--puz-bg); }
.cat-puz .cat-icon, .cat-puz .cat-link { color: var(--puzzles); }
.cat-puz .tag { background: var(--puz-bg); color: var(--puzzles); }
.cat-puz::after { background: var(--puzzles); }

.cat-books .cat-icon { background: var(--books-bg); }
.cat-books .cat-icon, .cat-books .cat-link { color: var(--books); }
.cat-books .tag { background: var(--books-bg); color: var(--books); }
.cat-books::after { background: var(--books); }

.cat-home .cat-icon { background: var(--home-bg); }
.cat-home .cat-icon, .cat-home .cat-link { color: var(--home); }
.cat-home .tag { background: var(--home-bg); color: var(--home); }
.cat-home::after { background: var(--home); }

/* ===== TOPIC SECTIONS ===== */
.topics { display: flex; flex-direction: column; gap: var(--space-6); }
.topic-card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}
.topic-header {
  padding: var(--space-6);
  cursor: pointer;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-4);
  user-select: none;
  transition: background 0.15s;
}
.topic-header:hover { background: var(--surface-2); }
.topic-header-left { display: flex; align-items: flex-start; gap: var(--space-4); }
.topic-num {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.875rem;
  flex-shrink: 0;
  margin-top: 2px;
}
.topic-header h3 { margin-bottom: var(--space-1); }
.topic-header p { font-size: 0.9rem; }
.topic-chevron {
  font-size: 1.25rem;
  color: var(--text-light);
  transition: transform 0.25s;
  flex-shrink: 0;
  margin-top: 2px;
}
.topic-card.open .topic-chevron { transform: rotate(180deg); }
.topic-body {
  display: none;
  padding: 0 var(--space-6) var(--space-6);
}
.topic-card.open .topic-body { display: block; }
.topic-content { border-top: 1px solid var(--border); padding-top: var(--space-6); }

/* ===== INFO BLOCKS ===== */
.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-4);
  margin: var(--space-4) 0;
}
.info-block {
  background: var(--surface-2);
  border-radius: var(--radius);
  padding: var(--space-4);
  border: 1px solid var(--border);
}
.info-block h4 { margin-bottom: var(--space-2); }
.info-block p { font-size: 0.9rem; }

.callout {
  border-radius: var(--radius);
  padding: var(--space-4) var(--space-5);
  margin: var(--space-4) 0;
  display: flex;
  gap: var(--space-3);
  border-left: 4px solid;
}
.callout-icon { font-size: 1.25rem; flex-shrink: 0; }
.callout h4 { margin-bottom: var(--space-1); }
.callout p { font-size: 0.9rem; margin-bottom: 0; }

.callout-tip { background: #ecfdf5; border-color: #059669; }
.callout-tip h4 { color: #059669; }
.callout-warn { background: #fffbeb; border-color: #d97706; }
.callout-warn h4 { color: #d97706; }
.callout-info { background: #eff6ff; border-color: #2563eb; }
.callout-info h4 { color: #2563eb; }
.callout-fact { background: #f5f3ff; border-color: #7c3aed; }
.callout-fact h4 { color: #7c3aed; }

/* ===== STAT CARDS ===== */
.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: var(--space-4);
  margin: var(--space-6) 0;
}
.stat-card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: var(--space-5);
  box-shadow: var(--shadow-card);
  text-align: center;
}
.stat-card .stat-num {
  font-size: 2rem;
  font-weight: 800;
  line-height: 1;
  margin-bottom: var(--space-2);
}
.stat-card .stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* ===== TIMELINE ===== */
.timeline { position: relative; padding-left: 2rem; }
.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 2px;
  background: var(--border);
  border-radius: 2px;
}
.timeline-item { position: relative; padding-bottom: var(--space-8); }
.timeline-item:last-child { padding-bottom: 0; }
.timeline-dot {
  position: absolute;
  left: -2.4rem;
  top: 0.25rem;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 2.5px solid white;
  box-shadow: 0 0 0 2px currentColor;
}
.timeline-year {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-2);
  opacity: 0.8;
}
.timeline-item h4 { margin-bottom: var(--space-2); color: var(--text); }
.timeline-item p { font-size: 0.9rem; }

/* ===== BOOK CARDS ===== */
.book-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-6);
}
.book-card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: var(--space-5);
  display: flex;
  gap: var(--space-4);
  transition: all 0.2s;
}
.book-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-2px); }
.book-cover {
  width: 60px;
  height: 84px;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  font-weight: 800;
}
.book-meta { flex: 1; min-width: 0; }
.book-meta h4 { font-size: 0.9375rem; margin-bottom: 2px; }
.book-meta .author { font-size: 0.8rem; color: var(--text-muted); margin-bottom: var(--space-2); }
.book-meta .why { font-size: 0.85rem; line-height: 1.5; }
.difficulty {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.75rem;
  font-weight: 500;
  padding: 2px 8px;
  border-radius: 100px;
  margin-top: var(--space-2);
}

/* ===== PUZZLE GRID ===== */
.puzzle-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-6);
}
.puzzle-card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}
.puzzle-top {
  padding: var(--space-6);
  display: flex;
  align-items: center;
  gap: var(--space-4);
}
.puzzle-icon-wrap {
  width: 56px;
  height: 56px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  flex-shrink: 0;
}
.puzzle-card h3 { margin-bottom: 4px; }
.puzzle-card .age-badge {
  font-size: 0.75rem;
  color: var(--text-muted);
}
.puzzle-skills {
  padding: 0 var(--space-6) var(--space-4);
}
.puzzle-skills h4 { font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--text-muted); margin-bottom: var(--space-3); }
.skill-tags { display: flex; flex-wrap: wrap; gap: var(--space-2); }
.skill-tag {
  padding: 3px 10px;
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 500;
  background: var(--surface-2);
  color: var(--text-muted);
  border: 1px solid var(--border);
}
.puzzle-desc {
  padding: var(--space-4) var(--space-6) var(--space-6);
  border-top: 1px solid var(--border);
}
.puzzle-desc p { font-size: 0.9rem; }

/* ===== INTERACTIVE CALCULATOR ===== */
.calculator {
  background: var(--surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-card);
  padding: var(--space-8);
}
.calc-title { margin-bottom: var(--space-6); }
.calc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}
.form-group { display: flex; flex-direction: column; gap: var(--space-2); }
.form-label { font-size: 0.875rem; font-weight: 600; color: var(--text); }
.form-input {
  padding: 0.625rem 0.875rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  font-size: 1rem;
  font-family: inherit;
  background: var(--surface);
  color: var(--text);
  transition: border-color 0.15s;
}
.form-input:focus { outline: none; border-color: var(--primary); }
.calc-result {
  background: var(--primary-light);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}
.calc-result .res-item { text-align: center; }
.calc-result .res-num { font-size: 1.75rem; font-weight: 800; color: var(--primary); line-height: 1; }
.calc-result .res-label { font-size: 0.8rem; color: var(--text-muted); margin-top: 4px; }

/* ===== MEDITATION TIMER ===== */
.breath-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-8) 0;
}
.breath-circle {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(109,40,217,0.3) 0%, rgba(109,40,217,0.05) 70%, transparent 100%);
  border: 3px solid rgba(109,40,217,0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--meditate);
  transition: transform 4s ease-in-out;
  margin-bottom: var(--space-6);
}
.breath-circle.expanding { transform: scale(1.4); }
.breath-circle.holding { transform: scale(1.4); transition: none; }
.breath-circle.shrinking { transform: scale(1); }
.breath-controls { display: flex; gap: var(--space-4); }
.breath-phase { font-size: 0.9rem; color: var(--text-muted); text-align: center; margin-bottom: var(--space-4); }
.breath-count { font-size: 0.8rem; color: var(--text-light); text-align: center; }

/* ===== WORLD MAP (SVG based) ===== */
.map-container {
  background: var(--surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}
.map-header { padding: var(--space-5) var(--space-6); border-bottom: 1px solid var(--border); }
.region-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: var(--space-4);
  padding: var(--space-6);
}
.region-card {
  background: var(--surface-2);
  border-radius: var(--radius);
  padding: var(--space-4);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: all 0.15s;
}
.region-card:hover { border-color: var(--geo); background: var(--geo-bg); }
.region-card.active { border-color: var(--geo); background: var(--geo-bg); box-shadow: 0 0 0 2px rgba(22,163,74,0.15); }
.region-card h4 { display: flex; align-items: center; gap: var(--space-2); margin-bottom: var(--space-2); }
.region-card p { font-size: 0.85rem; }
.region-detail {
  border-top: 1px solid var(--border);
  padding: var(--space-6);
  display: none;
}
.region-detail.visible { display: block; }

/* ===== BIAS CARDS ===== */
.bias-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-4);
}
.bias-card {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  padding: var(--space-5);
  border-top: 3px solid var(--psych);
}
.bias-card h4 { color: var(--text); margin-bottom: var(--space-2); display: flex; align-items: center; gap: var(--space-2); }
.bias-card .example {
  background: var(--psych-bg);
  border-radius: var(--radius-sm);
  padding: var(--space-3);
  font-size: 0.85rem;
  margin-top: var(--space-3);
  border-left: 3px solid var(--psych);
  color: var(--text-muted);
  font-style: italic;
}

/* ===== PHILOSOPHY CARDS ===== */
.quote-block {
  background: var(--phil-bg);
  border-radius: var(--radius);
  padding: var(--space-5) var(--space-6);
  border-left: 4px solid var(--philosophy);
  margin: var(--space-4) 0;
}
.quote-block blockquote {
  font-size: 1.125rem;
  font-style: italic;
  color: var(--text);
  line-height: 1.65;
  margin-bottom: var(--space-3);
}
.quote-block cite { font-size: 0.875rem; color: var(--philosophy); font-weight: 600; }

/* ===== SCIENCE VISUAL ===== */
.law-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-4);
}
.law-card {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  padding: var(--space-5);
  border-top: 3px solid var(--science);
}
.law-number { font-size: 2.5rem; font-weight: 800; color: rgba(37,99,235,0.1); line-height: 1; margin-bottom: var(--space-2); }
.law-card h4 { margin-bottom: var(--space-2); }
.law-card .daily-life { font-size: 0.85rem; background: var(--sci-bg); padding: var(--space-3); border-radius: var(--radius-sm); margin-top: var(--space-3); }

/* ===== NUTRIENT TABLE ===== */
.nutrient-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-4);
}
.nutrient-card {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}
.nutrient-top {
  padding: var(--space-4) var(--space-5);
  display: flex;
  align-items: center;
  gap: var(--space-3);
}
.nutrient-icon { font-size: 1.75rem; }
.nutrient-name { font-weight: 600; }
.nutrient-role { font-size: 0.8rem; color: var(--text-muted); }
.nutrient-body { padding: var(--space-4) var(--space-5); border-top: 1px solid var(--border); }
.nutrient-body p { font-size: 0.875rem; }
.nutrient-sources { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-top: var(--space-3); }
.nutrient-sources span {
  padding: 2px 8px;
  background: var(--surface-2);
  border-radius: 100px;
  font-size: 0.75rem;
  border: 1px solid var(--border);
}

/* ===== TABS ===== */
.tabs { display: flex; gap: var(--space-2); margin-bottom: var(--space-6); flex-wrap: wrap; }
.tab-btn {
  padding: var(--space-2) var(--space-5);
  border-radius: 100px;
  font-size: 0.875rem;
  font-weight: 600;
  border: 1.5px solid var(--border);
  background: white;
  color: var(--text-muted);
  transition: all 0.15s;
}
.tab-btn:hover { border-color: var(--primary); color: var(--primary); }
.tab-btn.active { background: var(--primary); color: white; border-color: var(--primary); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ===== STEPS ===== */
.steps { display: flex; flex-direction: column; gap: var(--space-4); }
.step { display: flex; gap: var(--space-4); }
.step-num {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.875rem;
  flex-shrink: 0;
}
.step-content { flex: 1; padding-top: 6px; }
.step-content h4 { margin-bottom: var(--space-2); }
.step-content p { font-size: 0.9rem; }

/* ===== FOOTER ===== */
.footer {
  background: #0f172a;
  color: #94a3b8;
  padding: var(--space-12) 0 var(--space-8);
  margin-top: var(--space-16);
}
.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}
.footer-top {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: var(--space-8);
  margin-bottom: var(--space-8);
}
.footer-brand { max-width: 280px; }
.footer-brand .logo-text { font-size: 1.25rem; font-weight: 800; color: white; margin-bottom: var(--space-3); }
.footer-brand p { font-size: 0.875rem; line-height: 1.7; }
.footer-col h5 { font-size: 0.875rem; font-weight: 700; color: white; margin-bottom: var(--space-4); letter-spacing: 0.05em; text-transform: uppercase; }
.footer-col ul { list-style: none; display: flex; flex-direction: column; gap: var(--space-3); }
.footer-col ul a { font-size: 0.875rem; transition: color 0.15s; }
.footer-col ul a:hover { color: white; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.08); padding-top: var(--space-6); display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: var(--space-4); }
.footer-bottom p { font-size: 0.8rem; }

/* ===== SECTION TITLES ===== */
.section-title { margin-bottom: var(--space-8); }
.section-title h2 { margin-bottom: var(--space-3); }
.section-title p { max-width: 600px; }
.divider { border: none; border-top: 1px solid var(--border); margin: var(--space-8) 0; }

/* ===== CHART CONTAINER ===== */
.chart-wrap {
  background: var(--surface-2);
  border-radius: var(--radius);
  padding: var(--space-4);
  margin: var(--space-4) 0;
  position: relative;
  height: 300px;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .footer-top { grid-template-columns: 1fr 1fr; }
  .footer-col:first-child { grid-column: 1 / -1; }
  .footer-brand { max-width: 100%; }
  .hero { padding: var(--space-8) 0; }
  .section { padding: var(--space-8) 0; }
  .calc-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
  .footer-top { grid-template-columns: 1fr; }
  .category-grid { grid-template-columns: 1fr; }
  .nav-links a { font-size: 0.8rem; padding: var(--space-2); }
  .calc-grid { grid-template-columns: 1fr; }
  h1 { font-size: 1.875rem; }
}

/* ===== SOURCES & RESOURCES ===== */
.page-resources { margin-top: 0; }

.resources-wrap {
  background: var(--surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}
.resources-header {
  padding: 1.5rem 2rem;
  border-bottom: 1px solid var(--border);
  background: var(--surface-2);
}
.resources-header h2 { font-size: 1.375rem; margin-bottom: 0.4rem; }

/* Video grid */
.vid-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1rem;
  padding: 1.5rem 2rem;
}
.vid-card {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  text-decoration: none;
  display: block;
  transition: all 0.2s;
  background: var(--surface);
}
.vid-card:hover { box-shadow: var(--shadow); transform: translateY(-2px); border-color: #e53e3e; }
.vid-thumb {
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
  padding: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 110px;
  position: relative;
}
.vid-emoji { font-size: 2.25rem; }
.vid-play {
  position: absolute;
  bottom: 0.5rem; right: 0.5rem;
  width: 28px; height: 28px;
  background: #dc2626;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: white; font-size: 0.6rem;
  box-shadow: 0 2px 6px rgba(220,38,38,0.4);
}
.vid-meta { padding: 0.75rem; }
.vid-channel {
  font-size: 0.68rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.05em;
  color: var(--text-muted); margin-bottom: 4px;
}
.vid-title { font-size: 0.85rem; font-weight: 600; color: var(--text); line-height: 1.4; }

/* Source pills */
.src-groups {
  padding: 1.25rem 2rem 1.75rem;
  border-top: 1px solid var(--border);
}
.src-groups-title {
  font-size: 0.9375rem; font-weight: 700;
  color: var(--text); margin-bottom: 1rem;
}
.src-pills { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.src-pill {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 5px 13px;
  background: var(--surface-2);
  border: 1.5px solid var(--border);
  border-radius: 100px;
  font-size: 0.8rem; font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  transition: all 0.15s;
}
.src-pill:hover {
  background: var(--primary-light);
  color: var(--primary);
  border-color: rgba(79,70,229,0.35);
}
.src-pill .src-domain {
  font-size: 0.7rem; color: var(--text-light);
  font-weight: 400;
}

/* Credibility badge on callouts */
.cred-badge {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 2px 8px;
  background: rgba(255,255,255,0.7);
  border-radius: 100px;
  font-size: 0.7rem; font-weight: 600;
  color: #065f46;
  border: 1px solid rgba(5,150,105,0.2);
  text-decoration: none;
  margin-left: 0.5rem;
  vertical-align: middle;
}
.cred-badge:hover { background: white; }

@media (max-width: 768px) {
  .vid-grid { padding: 1rem; }
  .src-groups { padding: 1rem; }
  .resources-header { padding: 1.25rem 1rem; }
}

/* ===== ANIMATIONS ===== */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes pulse-ring {
  0% { box-shadow: 0 0 0 0 rgba(109,40,217,0.3); }
  70% { box-shadow: 0 0 0 20px rgba(109,40,217,0); }
  100% { box-shadow: 0 0 0 0 rgba(109,40,217,0); }
}
.animate-up { animation: fadeUp 0.5s ease forwards; }
.fade-1 { animation-delay: 0.05s; opacity: 0; }
.fade-2 { animation-delay: 0.1s; opacity: 0; }
.fade-3 { animation-delay: 0.15s; opacity: 0; }

/* ===== PROGRESS BAR ===== */
.progress-wrap { background: var(--border); border-radius: 100px; height: 8px; overflow: hidden; }
.progress-bar { height: 100%; border-radius: 100px; transition: width 0.6s ease; }

/* ===== SLEEP PHASES ===== */
.sleep-chart {
  display: flex;
  gap: 2px;
  height: 80px;
  align-items: flex-end;
  background: var(--surface-2);
  border-radius: var(--radius);
  padding: var(--space-3);
  margin: var(--space-4) 0;
}
.sleep-phase {
  flex: 1;
  border-radius: 3px 3px 0 0;
  transition: height 0.5s ease;
  position: relative;
  cursor: pointer;
}
.sleep-phase:hover::after {
  content: attr(data-tip);
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  background: #0f172a;
  color: white;
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 0.7rem;
  white-space: nowrap;
  margin-bottom: 4px;
  z-index: 10;
}