/* ============================================================
   TENSO Design System — main.css
   ============================================================ */

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

/* ---------- Design Tokens ---------- */
:root {
  --bg-1: #000b22;
  --bg-2: #001E5F;
  --bg-3: #0a2a7a;
  --accent-primary: #FFD82B;
  --accent-secondary: #0066FD;
  --accent-tertiary: #FFE95F;
  --text-primary: #f0f4ff;
  --text-secondary: #B7D3FF;
  --text-muted: #66A2FF;
  --border: rgba(255,216,43,0.15);
  --border-hover: rgba(255,216,43,0.4);
  --glass-bg: rgba(0,30,95,0.7);
  --glass-border: rgba(255,216,43,0.2);
  --shadow: 0 8px 32px rgba(0,0,0,0.4);
  --shadow-glow: 0 0 30px rgba(255,216,43,0.15);
  --radius: 12px;
  --radius-lg: 20px;
  --scroll-progress: 0;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="light"] {
  --bg-1: #f8f9ff;
  --bg-2: #EEF3FF;
  --bg-3: #B7D3FF;
  --accent-primary: #001E5F;
  --accent-secondary: #003EFF;
  --text-primary: #000b22;
  --text-secondary: #001E5F;
  --text-muted: #0066FD;
  --border: rgba(0,30,95,0.15);
  --border-hover: rgba(0,30,95,0.4);
  --glass-bg: rgba(240,244,255,0.8);
  --glass-border: rgba(0,30,95,0.2);
  --shadow: 0 8px 32px rgba(0,0,0,0.1);
  --shadow-glow: 0 0 30px rgba(0,30,95,0.1);
}

/* ---------- Reset & Base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--bg-1);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background var(--transition), color var(--transition);
  overflow-x: hidden;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  line-height: 1.2;
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.25rem); }
h3 { font-size: clamp(1.2rem, 2vw, 1.5rem); }
h4 { font-size: 1.1rem; }

p { color: var(--text-secondary); }

a {
  color: var(--accent-primary);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover { color: var(--accent-secondary); }

.article a:not([class]),
.callout a:not([class]),
.feature-card a:not([class]) {
  text-decoration: underline;
}

code, pre {
  font-family: 'JetBrains Mono', monospace;
}

/* ---------- Progress Bar ---------- */
.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  width: calc(var(--scroll-progress) * 100%);
  height: 3px;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
  z-index: 9999;
  transition: width 0.1s linear;
}

/* ---------- Navigation ---------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 0 2rem;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(0,11,34,0.7);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: all var(--transition);
}

.nav--scrolled {
  background: rgba(0,11,34,0.95);
  box-shadow: var(--shadow);
}

[data-theme="light"] .nav {
  background: rgba(248,250,255,0.7);
}

[data-theme="light"] .nav--scrolled {
  background: rgba(248,250,255,0.95);
}

.nav__logo {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.4rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-decoration: none;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  list-style: none;
}

.nav__link {
  padding: 0.4rem 0.75rem;
  border-radius: 8px;
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: all var(--transition);
  white-space: nowrap;
}

.nav__link:hover,
.nav__link--active {
  color: var(--accent-primary);
  background: rgba(255,216,43,0.08);
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-icon {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
  font-size: 0.9rem;
}

.btn-icon:hover {
  background: rgba(255,216,43,0.1);
  color: var(--accent-primary);
  border-color: var(--accent-primary);
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 4px;
  cursor: pointer;
  padding: 8px;
}

.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  transition: all var(--transition);
  border-radius: 2px;
}

/* ---------- Mobile Nav ---------- */
@media (max-width: 768px) {
  .nav__links {
    position: fixed;
    top: 64px;
    left: 0; right: 0;
    background: var(--bg-2);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 1rem;
    gap: 0.25rem;
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition);
  }

  .nav__links--open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }

  .nav__link {
    width: 100%;
    display: block;
    padding: 0.6rem 1rem;
  }

  .hamburger { display: flex; }
}

/* ---------- Full-page canvas background ---------- */
body > #hero-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  pointer-events: none;
}

/* ---------- Hero Section ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

/* Stacking context: all major sections above canvas */
.hero,
section,
.footer {
  position: relative;
  z-index: 1;
}

.hero__content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 2rem;
  max-width: 900px;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1rem;
  border-radius: 100px;
  background: rgba(255,216,43,0.1);
  border: 1px solid rgba(255,216,43,0.3);
  color: var(--accent-primary);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  margin-bottom: 1.5rem;
}

.hero__title {
  font-size: clamp(3rem, 10vw, 7rem);
  font-weight: 700;
  background: linear-gradient(135deg, #fff 0%, var(--accent-primary) 50%, var(--accent-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.25rem;
}

.hero__subtitle {
  font-size: clamp(0.9rem, 2vw, 1.1rem);
  color: var(--text-muted);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 1.5rem;
}

.hero__typewriter {
  font-size: clamp(1.1rem, 2.5vw, 1.5rem);
  color: var(--text-secondary);
  min-height: 2rem;
  margin-bottom: 2.5rem;
}

.hero__typewriter .cursor {
  display: inline-block;
  width: 2px;
  height: 1.2em;
  background: var(--accent-primary);
  margin-left: 2px;
  vertical-align: middle;
  animation: blink 1s step-end infinite;
}

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

.hero__ctas {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 3rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  border-radius: 10px;
  font-family: 'Inter', sans-serif;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  text-decoration: none;
}

.btn--primary {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  color: white;
  box-shadow: 0 4px 20px rgba(255,216,43,0.3);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(255,216,43,0.4);
  color: white;
}

.btn--secondary {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-hover);
}

.btn--secondary:hover {
  background: rgba(255,255,255,0.05);
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  transform: translateY(-2px);
}

.hero__stats {
  display: flex;
  gap: 2rem;
  justify-content: center;
  flex-wrap: wrap;
}

.hero__stat {
  text-align: center;
}

.hero__stat-value {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--accent-primary);
  display: block;
}

.hero__stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

/* ---------- Sections ---------- */
section {
  padding: 5rem 2rem;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
}

.section__header {
  text-align: center;
  margin-bottom: 3.5rem;
}

.section__eyebrow {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent-primary);
  margin-bottom: 0.75rem;
}

.section__title {
  margin-bottom: 1rem;
}

.section__desc {
  max-width: 600px;
  margin: 0 auto;
  color: var(--text-secondary);
}

/* ---------- Feature Cards ---------- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.feature-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 2rem;
  backdrop-filter: blur(10px);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
  opacity: 0;
  transition: opacity var(--transition);
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-glow);
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-card__icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(255,216,43,0.15), rgba(0,102,253,0.15));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  color: var(--accent-primary);
  margin-bottom: 1.25rem;
}

.feature-card__title {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.feature-card__desc {
  font-size: 0.9rem;
  line-height: 1.6;
}

/* ---------- Reveal Animations ---------- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal--visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal[data-delay="1"] { transition-delay: 0.1s; }
.reveal[data-delay="2"] { transition-delay: 0.2s; }
.reveal[data-delay="3"] { transition-delay: 0.3s; }
.reveal[data-delay="4"] { transition-delay: 0.4s; }
.reveal[data-delay="5"] { transition-delay: 0.5s; }
.reveal[data-delay="6"] { transition-delay: 0.6s; }

/* ---------- Code Tabs ---------- */
.tabs {
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-2);
  border: 1px solid var(--border);
}

.tabs__nav {
  display: flex;
  background: var(--bg-3);
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
}

.tab-btn {
  padding: 0.75rem 1.25rem;
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-family: 'Inter', sans-serif;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
  border-bottom: 2px solid transparent;
}

.tab-btn:hover {
  color: var(--text-primary);
  background: rgba(255,255,255,0.05);
}

.tab-btn[aria-selected="true"] {
  color: var(--accent-primary);
  border-bottom-color: var(--accent-primary);
  background: rgba(255,216,43,0.05);
}

.tab-panel {
  display: none;
}

.tab-panel[aria-hidden="false"] {
  display: block;
}

/* ---------- Code Blocks ---------- */
.code-block {
  position: relative;
}

.code-block pre {
  margin: 0;
  padding: 1.5rem;
  overflow-x: auto;
  background: var(--bg-2) !important;
  font-size: 0.85rem;
  line-height: 1.6;
}

.copy-btn {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  padding: 0.3rem 0.6rem;
  border-radius: 6px;
  background: rgba(255,255,255,0.1);
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.75rem;
  cursor: pointer;
  transition: all var(--transition);
  font-family: 'Inter', sans-serif;
}

.copy-btn:hover {
  background: rgba(255,216,43,0.15);
  color: var(--accent-primary);
  border-color: var(--accent-primary);
}

/* ---------- Sidebar Layout ---------- */
.page-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 3rem;
  max-width: 1200px;
  margin: 0 auto;
  padding: 7rem 2rem 4rem;
}

@media (max-width: 900px) {
  .page-layout {
    grid-template-columns: 1fr;
  }
  .sidebar { display: none; }
}

.sidebar {
  position: sticky;
  top: 80px;
  align-self: start;
  max-height: calc(100vh - 100px);
  overflow-y: auto;
}

.toc {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
}

.toc__title {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.toc__list {
  list-style: none;
}

.toc__item { margin: 0.15rem 0; }

.toc__link {
  display: block;
  padding: 0.3rem 0.5rem;
  border-radius: 6px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  transition: all var(--transition);
  border-left: 2px solid transparent;
}

.toc__link:hover {
  color: var(--accent-primary);
  background: rgba(255,216,43,0.05);
}

.toc__link--active {
  color: var(--accent-primary);
  border-left-color: var(--accent-primary);
  background: rgba(255,216,43,0.08);
}

.toc__item--sub .toc__link {
  padding-left: 1.25rem;
  font-size: 0.8rem;
}

/* ---------- Breadcrumb ---------- */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 2rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.breadcrumb a {
  color: var(--text-muted);
}

.breadcrumb a:hover {
  color: var(--accent-primary);
}

.breadcrumb__sep { opacity: 0.5; }
.breadcrumb__current { color: var(--text-secondary); }

/* ---------- Article ---------- */
.article h2 {
  margin-top: 3rem;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.article h3 {
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}

.article p {
  margin-bottom: 1rem;
}

.article ul, .article ol {
  margin: 1rem 0 1rem 1.5rem;
  color: var(--text-secondary);
}

.article li { margin: 0.35rem 0; }

.article pre {
  margin: 1.5rem 0;
  border-radius: var(--radius);
  overflow: hidden;
}

.article .code-block {
  margin: 1.5rem 0;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
}

/* ---------- Callout / Tip boxes ---------- */
.callout {
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  border-left: 3px solid;
  display: flex;
  gap: 0.75rem;
}

.callout--tip {
  background: rgba(255,216,43,0.05);
  border-color: var(--accent-primary);
  color: var(--text-secondary);
}

.callout--note {
  background: rgba(0,102,253,0.05);
  border-color: var(--accent-secondary);
  color: var(--text-secondary);
}

.callout--warning {
  background: rgba(255,170,0,0.05);
  border-color: #ffaa00;
  color: var(--text-secondary);
}

.callout__icon {
  font-size: 1rem;
  flex-shrink: 0;
  margin-top: 0.1rem;
}

.callout--tip .callout__icon { color: var(--accent-primary); }
.callout--note .callout__icon { color: var(--accent-secondary); }
.callout--warning .callout__icon { color: #ffaa00; }

/* ---------- Tables ---------- */
.table-wrapper {
  overflow-x: auto;
  margin: 1.5rem 0;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

thead {
  background: var(--bg-3);
}

th {
  padding: 0.75rem 1rem;
  text-align: left;
  font-weight: 600;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border);
}

td {
  padding: 0.65rem 1rem;
  color: var(--text-secondary);
  border-bottom: 1px solid rgba(255,255,255,0.04);
}

tr:last-child td { border-bottom: none; }
tr:hover td { background: rgba(255,255,255,0.02); }

/* ---------- OS Tab Switcher ---------- */
.os-tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.os-tab-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.25rem;
  border-radius: var(--radius);
  background: var(--bg-2);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-family: 'Inter', sans-serif;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
}

.os-tab-btn:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

.os-tab-btn.active,
.os-tab-btn[aria-selected="true"] {
  background: rgba(255,216,43,0.1);
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

.os-panel { display: none; }
.os-panel.active { display: block; }

/* ---------- Step Cards ---------- */
.step-card {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  margin-bottom: 1.5rem;
  position: relative;
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  color: white;
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: 1.1rem;
  margin-bottom: 1rem;
}

/* ---------- Layer Timeline ---------- */
.layer-timeline {
  position: relative;
  padding-left: 3rem;
}

.layer-timeline::before {
  content: '';
  position: absolute;
  left: 16px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent-primary), var(--accent-secondary));
}

.layer-card {
  position: relative;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 2rem;
  margin-bottom: 2rem;
  backdrop-filter: blur(10px);
  transition: all var(--transition);
}

.layer-card::before {
  content: '';
  position: absolute;
  left: -2.5rem;
  top: 50%;
  transform: translateY(-50%);
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent-primary);
  border: 2px solid var(--bg-1);
  box-shadow: 0 0 10px var(--accent-primary);
}

.layer-card:hover {
  transform: translateX(4px);
  border-color: var(--border-hover);
}

.layer-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.25rem 0.75rem;
  border-radius: 100px;
  background: rgba(255,216,43,0.1);
  border: 1px solid rgba(255,216,43,0.3);
  color: var(--accent-primary);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  margin-bottom: 0.75rem;
}

/* ---------- Collapsible API Sections ---------- */
.collapsible {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 0.75rem;
  overflow: hidden;
}

.collapsible__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  background: var(--bg-2);
  cursor: pointer;
  transition: background var(--transition);
  user-select: none;
  gap: 1rem;
}

.collapsible__header:hover {
  background: var(--bg-3);
}

.collapsible__title {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.9rem;
  color: var(--accent-primary);
  font-weight: 500;
}

.collapsible__badge {
  font-size: 0.7rem;
  padding: 0.15rem 0.5rem;
  border-radius: 100px;
  background: rgba(0,102,253,0.15);
  color: var(--accent-secondary);
  border: 1px solid rgba(0,102,253,0.3);
  white-space: nowrap;
}

.collapsible__icon {
  flex-shrink: 0;
  transition: transform var(--transition);
  color: var(--text-muted);
}

.collapsible--open .collapsible__icon {
  transform: rotate(180deg);
}

.collapsible__body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}

.collapsible__content {
  padding: 1.25rem;
  background: var(--bg-1);
  border-top: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* ---------- Example Cards Gallery ---------- */
.examples-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}

.example-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
}

.example-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-glow);
}

.example-card__img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  background: var(--bg-3);
}

.example-card__img--placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  height: 180px;
  background: linear-gradient(135deg, var(--bg-2), var(--bg-3));
}

.example-card__body {
  padding: 1.25rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.example-card__tags {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  margin-bottom: 0.75rem;
}

.tag {
  font-size: 0.7rem;
  padding: 0.2rem 0.5rem;
  border-radius: 100px;
  background: rgba(255,216,43,0.1);
  color: var(--accent-primary);
  border: 1px solid rgba(255,216,43,0.2);
  font-weight: 500;
}

.tag--purple {
  background: rgba(0,102,253,0.1);
  color: var(--accent-secondary);
  border-color: rgba(0,102,253,0.2);
}

.example-card__title {
  font-size: 1.05rem;
  margin-bottom: 0.5rem;
}

.example-card__desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  flex: 1;
  margin-bottom: 1rem;
}

.btn--sm {
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
}

/* ---------- Citation Cards ---------- */
.citation-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin-bottom: 2rem;
  backdrop-filter: blur(10px);
}

.citation-format-tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.format-tab-btn {
  padding: 0.35rem 0.75rem;
  border-radius: 8px;
  background: var(--bg-3);
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.8rem;
  font-family: 'JetBrains Mono', monospace;
  cursor: pointer;
  transition: all var(--transition);
}

.format-tab-btn.active {
  background: rgba(255,216,43,0.1);
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

.citation-block {
  display: none;
  position: relative;
}

.citation-block.active {
  display: block;
}

.citation-block pre {
  padding: 1.25rem;
  border-radius: var(--radius);
  background: var(--bg-1);
  border: 1px solid var(--border);
  white-space: pre-wrap;
  word-break: break-word;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin: 0;
}

.doi-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.3rem 0.75rem;
  border-radius: 100px;
  background: rgba(255,216,43,0.1);
  border: 1px solid rgba(255,216,43,0.3);
  color: var(--accent-primary);
  font-size: 0.8rem;
  font-family: 'JetBrains Mono', monospace;
  text-decoration: none;
  transition: all var(--transition);
}

.doi-badge:hover {
  background: rgba(255,216,43,0.2);
  color: var(--accent-primary);
}

/* ---------- Team Cards ---------- */
.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.5rem;
}

.team-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  text-align: center;
  backdrop-filter: blur(10px);
  transition: all var(--transition);
}

.team-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-glow);
}

.team-card__avatar {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.5rem;
  font-weight: 700;
  color: white;
  margin: 0 auto 1rem;
}

.team-card__name {
  font-size: 1.1rem;
  margin-bottom: 0.25rem;
}

.team-card__role {
  font-size: 0.85rem;
  color: var(--accent-primary);
  margin-bottom: 0.35rem;
  font-weight: 500;
}

.team-card__dept {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.team-card__email {
  font-size: 0.8rem;
  font-family: 'JetBrains Mono', monospace;
}

/* ---------- Scaling Comparison Card ---------- */
.scaling-card {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin: 2rem 0;
}

.scaling-card__panels {
  display: grid;
  grid-template-columns: 1fr 1fr;
}

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

.scaling-panel {
  padding: 2rem;
}

.scaling-panel--bad {
  background: rgba(239,68,68,0.05);
  border-right: 1px solid var(--border);
}

.scaling-panel--good {
  background: rgba(255,216,43,0.05);
}

.scaling-panel__label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.scaling-panel--bad .scaling-panel__label { color: #ef4444; }
.scaling-panel--good .scaling-panel__label { color: var(--accent-primary); }

.scaling-panel__formula {
  font-size: 1.1rem;
  margin-bottom: 0.75rem;
}

.scaling-panel__example {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-style: italic;
}

/* ---------- Variable Grid ---------- */
.var-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin: 2rem 0;
}

.var-card {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  text-align: center;
  transition: all var(--transition);
}

.var-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

.var-card__symbol {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--accent-primary);
  display: block;
  margin-bottom: 0.5rem;
}

.var-card__name {
  font-weight: 600;
  margin-bottom: 0.25rem;
  font-size: 0.95rem;
}

.var-card__meaning {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.var-card__how {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-family: 'JetBrains Mono', monospace;
}

/* ---------- 404 Page ---------- */
.error-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 2rem;
}

.error-page__code {
  font-size: clamp(6rem, 20vw, 12rem);
  font-weight: 700;
  font-family: 'Space Grotesk', sans-serif;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
}

/* ---------- Search ---------- */
.search-bar {
  position: relative;
  max-width: 400px;
}

.search-input {
  width: 100%;
  padding: 0.6rem 1rem 0.6rem 2.5rem;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-primary);
  font-family: 'Inter', sans-serif;
  font-size: 0.9rem;
  transition: all var(--transition);
  outline: none;
}

.search-input:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(255,216,43,0.1);
}

.search-icon {
  position: absolute;
  left: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}

.search-results {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  right: 0;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  max-height: 400px;
  overflow-y: auto;
  z-index: 2000;
  box-shadow: var(--shadow);
  display: none;
}

.search-results--open { display: block; }

.search-result-item {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  transition: background var(--transition);
  text-decoration: none;
  display: block;
  color: inherit;
}

.search-result-item:last-child { border-bottom: none; }

.search-result-item:hover { background: rgba(255,216,43,0.05); }

.search-result-title {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-primary);
}

.search-result-section {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.2rem;
}

/* ---------- Funding Box ---------- */
.funding-box {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-top: 2rem;
}

.funding-box__title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.75rem;
}

.funding-box__text {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ---------- Footer ---------- */
.footer {
  background: var(--bg-2);
  border-top: 1px solid var(--border);
  padding: 3rem 2rem 2rem;
}

.footer__grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 2rem;
  max-width: 1200px;
  margin: 0 auto 2rem;
}

@media (max-width: 768px) {
  .footer__grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 480px) {
  .footer__grid {
    grid-template-columns: 1fr;
  }
}

.footer__brand-name {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.2rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.5rem;
}

.footer__tagline {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.footer__col-title {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.footer__links {
  list-style: none;
}

.footer__link {
  display: block;
  padding: 0.2rem 0;
  font-size: 0.85rem;
  color: var(--text-secondary);
  transition: color var(--transition);
}

.footer__link:hover {
  color: var(--accent-primary);
}

.footer__bottom {
  max-width: 1200px;
  margin: 0 auto;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

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

/* ---------- Utilities ---------- */
.text-gradient {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }
.text-accent { color: var(--accent-primary); }

/* ---------- Yellowjacket Mascot ---------- */
.hero__mascot {
  position: absolute;
  right: 8%;
  bottom: 10%;
  width: 130px;
  opacity: 0.85;
  animation: mascot-float 4s ease-in-out infinite;
  pointer-events: none;
}
@keyframes mascot-float {
  0%, 100% { transform: translateY(0) rotate(-5deg); }
  50%       { transform: translateY(-14px) rotate(5deg); }
}

/* ---------- MathJax overrides ---------- */
.MathJax {
  color: var(--text-primary) !important;
}

/* ---------- Responsive ---------- */
@media (max-width: 480px) {
  section { padding: 3rem 1rem; }
  .hero__ctas { flex-direction: column; align-items: center; }
  .hero__stats { gap: 1rem; }
}