/* Video-MME-v2 — Synthetica Core Design System */
@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=Inter:wght@400;500;600&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --bg: #0b1326;
  --surface-low: #131b2e;
  --surface: #171f33;
  --surface-high: #222a3d;
  --surface-highest: #2d3449;
  --primary: #c0c1ff;
  --primary-container: #8083ff;
  --secondary-container: #42447b;
  --accent: #2fd9f4;
  --accent-container: #008395;
  --on-surface: #dae2fd;
  --on-surface-variant: #c7c4d7;
  --outline-variant: #464554;
  --gradient: linear-gradient(135deg, #8083ff, #2fd9f4);
  --gradient-subtle: linear-gradient(135deg, rgba(128,131,255,0.15), rgba(47,217,244,0.15));
  --shadow-ambient: 0 20px 40px rgba(7,0,108,0.2);
  --radius: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-pill: 9999px;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--on-surface);
  font-family: 'Inter', sans-serif;
  font-size: 1rem;
  line-height: 1.7;
  background-image: url("data:image/svg+xml,%3Csvg width='24' height='24' xmlns='http://www.w3.org/2000/svg'%3E%3Crect width='24' height='24' fill='none'/%3E%3Cpath d='M0 0h1v24H0zm24 0h-1v24h1zM0 0v1h24V0zm0 24v-1h24v1z' fill='rgba(218,226,253,0.02)'/%3E%3C/svg%3E");
}

a { color: var(--primary); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--accent); }

img { max-width: 100%; height: auto; display: block; border-radius: var(--radius); }

/* ── Sticky Nav ── */
.flecto-nav {
  position: sticky;
  top: 0;
  z-index: 9999;
  background: #1a1a2e;
  padding: 6px 16px;
  font-family: system-ui, sans-serif;
  font-size: 13px;
  border-bottom: 1px solid #333;
}
.flecto-nav a { color: #8b8bcd; }
.flecto-nav a:hover { color: #c0c1ff; }

/* ── Hero ── */
.hero {
  position: relative;
  min-height: 70vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 5rem 2rem 4rem;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('./assets/bg_hero.png');
  background-size: cover;
  background-position: center;
  z-index: 0;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, rgba(11,19,38,0.78) 0%, rgba(11,19,38,0.9) 100%);
  z-index: 1;
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 900px;
  margin: 0 auto;
  width: 100%;
}

/* ── Badges ── */
.badge-row { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 1.5rem; }
.badge {
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-pill);
  font-size: 0.75rem;
  font-family: 'Inter', sans-serif;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.badge-primary { background: var(--gradient); color: #fff; }
.badge-accent { background: rgba(47,217,244,0.15); color: var(--accent); border: 1px solid rgba(47,217,244,0.3); }
.badge-surface { background: var(--surface-highest); color: var(--on-surface-variant); }

/* ── Hero Title ── */
.hero h1 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
  color: #fff;
  margin-bottom: 1rem;
}
.hero-authors {
  font-size: 0.9rem;
  color: var(--on-surface-variant);
  margin-bottom: 2rem;
}

/* ── Stats Row ── */
.stats-row { display: flex; flex-wrap: wrap; gap: 1rem; margin-bottom: 2rem; }
.stat-card {
  background: var(--surface-high);
  border-radius: var(--radius-lg);
  padding: 1rem 1.5rem;
  text-align: center;
  flex: 1;
  min-width: 120px;
  border-top: 2px solid;
  border-image: var(--gradient) 1;
  box-shadow: var(--shadow-ambient);
}
.stat-number {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.8rem;
  font-weight: 700;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-label {
  font-size: 0.75rem;
  color: var(--on-surface-variant);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: 0.25rem;
}

/* ── Hero Actions ── */
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.75rem; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.6rem 1.25rem;
  border-radius: var(--radius-lg);
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.875rem;
  font-weight: 600;
  transition: all 0.2s;
  cursor: pointer;
  border: none;
}
.btn-primary { background: var(--gradient); color: #fff; }
.btn-primary:hover { opacity: 0.85; color: #fff; transform: translateY(-1px); }
.btn-ghost {
  background: transparent;
  color: var(--primary);
  border: 1px solid rgba(192,193,255,0.3);
}
.btn-ghost:hover { background: rgba(192,193,255,0.08); color: var(--primary); }

/* ── Sections ── */
section { padding: 4rem 2rem; }
.section-inner { max-width: 1100px; margin: 0 auto; }
.section-label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.75rem;
}
section h2 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: #fff;
  margin-bottom: 1.5rem;
}
section h3 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 0.75rem;
}

/* Alternating sections */
.section-alt { background: var(--surface-low); }

/* ── Abstract ── */
.abstract-text {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--on-surface);
  max-width: 800px;
  margin: 0 auto;
}
.abstract-text em { color: var(--accent); font-style: normal; font-weight: 600; }

/* ── Cards ── */
.card {
  background: var(--surface-high);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-ambient);
  transition: background 0.2s, transform 0.2s;
}
.card:hover { background: var(--surface-highest); transform: translateY(-2px); }
.card-grid { display: grid; gap: 1.25rem; }
.card-grid-2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.card-grid-3 { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.card-grid-4 { grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); }

/* ── Hierarchy Levels ── */
.hierarchy-flow {
  display: flex;
  align-items: stretch;
  gap: 0;
  margin: 2rem 0;
  flex-wrap: wrap;
}
.level-card {
  flex: 1;
  min-width: 200px;
  background: var(--surface-high);
  padding: 1.5rem;
  position: relative;
}
.level-card:first-child { border-radius: var(--radius-lg) 0 0 var(--radius-lg); border-left: 3px solid var(--primary-container); }
.level-card:nth-child(2) { border-top: 3px solid var(--accent); }
.level-card:last-child { border-radius: 0 var(--radius-lg) var(--radius-lg) 0; border-right: 3px solid var(--accent-container); }
.level-number {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}
.level-card:first-child .level-number { color: var(--primary-container); }
.level-card:nth-child(2) .level-number { color: var(--accent); }
.level-card:last-child .level-number { color: #a78bfa; }
.level-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.5rem;
}
.level-desc { font-size: 0.875rem; color: var(--on-surface-variant); }
.level-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 0.5rem;
  background: var(--surface);
  color: var(--accent);
  font-size: 1.5rem;
  flex-shrink: 0;
}

/* ── Group Eval ── */
.eval-strategy-card {
  background: var(--gradient-subtle);
  border: 1px solid rgba(128,131,255,0.2);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin-top: 2rem;
}
.formula-box {
  background: var(--surface-highest);
  border-radius: var(--radius);
  padding: 1rem 1.5rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  color: var(--accent);
  margin: 1rem 0;
  overflow-x: auto;
}

/* ── Figures ── */
.figure-container { margin: 2rem 0; }
.figure-container img { width: 100%; border-radius: var(--radius-lg); }
figcaption {
  font-size: 0.8rem;
  color: var(--on-surface-variant);
  margin-top: 0.5rem;
  padding: 0 0.5rem;
}
figcaption strong { color: var(--primary); }
.figure-grid-2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 1.5rem; }
.figure-grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1rem; }

/* ── Findings Cards ── */
.finding-icon { font-size: 2rem; margin-bottom: 0.75rem; }
.finding-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.95rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.5rem;
}
.finding-text { font-size: 0.875rem; color: var(--on-surface-variant); }

/* ── Key Numbers ── */
.key-numbers { display: flex; flex-wrap: wrap; gap: 2rem; justify-content: center; margin: 2rem 0; }
.key-number-item { text-align: center; }
.key-number {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 3rem;
  font-weight: 700;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.key-number-label { font-size: 0.8rem; color: var(--on-surface-variant); text-transform: uppercase; letter-spacing: 0.05em; }

/* ── Table ── */
.table-wrapper { overflow-x: auto; margin: 1.5rem 0; }
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}
th {
  background: var(--surface-highest);
  color: var(--primary);
  padding: 0.6rem 0.75rem;
  text-align: left;
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  white-space: nowrap;
}
td {
  padding: 0.5rem 0.75rem;
  color: var(--on-surface-variant);
  border-bottom: 1px solid rgba(70,69,84,0.3);
}
tr:hover td { background: var(--surface-high); color: var(--on-surface); }
.td-highlight { color: var(--accent); font-weight: 700; }
.td-top { color: var(--primary); font-weight: 700; }

/* ── Flecto UI classes (for explanation injection) ── */
.flecto-note, .flecto-callout, .flecto-card, .flecto-panel {
  margin: 1.25rem 0;
  border-radius: var(--radius-lg);
  position: relative;
}
.flecto-note::before, .flecto-callout::before, .flecto-card::before, .flecto-panel::before {
  content: "🤖 AI explanation";
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  color: #60a5fa;
  letter-spacing: 0.06em;
  display: block;
  margin-bottom: 0.5em;
}
.flecto-note {
  background: rgba(47,217,244,0.06);
  border-left: 3px solid var(--accent);
  padding: 0.75rem 1rem;
  font-size: 0.9rem;
}
.flecto-callout {
  background: rgba(128,131,255,0.08);
  border: 1px solid rgba(128,131,255,0.25);
  padding: 1rem 1.25rem;
}
.flecto-card {
  background: var(--surface-high);
  border: 1px solid rgba(70,69,84,0.5);
  padding: 1.25rem;
  box-shadow: var(--shadow-ambient);
}
.flecto-panel {
  background: var(--surface-low);
  border: 1px solid rgba(128,131,255,0.2);
  padding: 1.5rem;
}

/* ── Reveal animation ── */
.reveal { opacity: 0; transform: translateY(20px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; transition: none; } }

/* ── Details / Accordion ── */
details { margin: 1rem 0; }
summary {
  cursor: pointer;
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  color: var(--primary);
  padding: 0.75rem 1rem;
  background: var(--surface-high);
  border-radius: var(--radius);
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
summary::after { content: '▼'; font-size: 0.75rem; transition: transform 0.2s; }
details[open] summary::after { transform: rotate(180deg); }
details > div { padding: 1rem; background: var(--surface); border-radius: 0 0 var(--radius) var(--radius); }

/* ── Tags ── */
.tag-row { display: flex; flex-wrap: wrap; gap: 0.5rem; margin: 1rem 0; }
.tag {
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-pill);
  font-size: 0.75rem;
  background: var(--surface-highest);
  color: var(--on-surface-variant);
  font-weight: 500;
}

/* ── Footer ── */
footer {
  background: var(--surface-low);
  padding: 2rem;
  text-align: center;
  font-size: 0.8rem;
  color: var(--on-surface-variant);
  border-top: 1px solid rgba(70,69,84,0.4);
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .hero { padding: 4rem 1.25rem 3rem; }
  section { padding: 3rem 1.25rem; }
  .hierarchy-flow { flex-direction: column; }
  .level-card:first-child { border-radius: var(--radius-lg) var(--radius-lg) 0 0; border-left: none; border-top: 3px solid var(--primary-container); }
  .level-card:last-child { border-radius: 0 0 var(--radius-lg) var(--radius-lg); border-right: none; border-bottom: 3px solid var(--accent-container); }
  .level-arrow { padding: 0.5rem; transform: rotate(90deg); }
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .key-number { font-size: 2.2rem; }
}