/* === QuanBench+ — The Quantum Observatory === */
/* Design System: Stitch "Quantum Horizon" */

:root {
  --primary: #7c3aed;
  --primary-light: #d2bbff;
  --accent: #06b6d4;
  --secondary: #3b82f6;
  --bg-deepest: #0c0c1d;
  --bg-surface: #121222;
  --bg-container: #1e1e2f;
  --bg-container-high: #29283a;
  --bg-container-highest: #333345;
  --text-primary: #e3e0f8;
  --text-secondary: #ccc3d8;
  --outline-variant: #4a4455;
  --error: #ffb4ab;
  --gradient-start: #7c3aed;
  --gradient-end: #0566d9;
  --font-heading: 'Noto Serif', Georgia, serif;
  --font-body: 'Inter', 'Segoe UI', sans-serif;
  --font-mono: 'Space Grotesk', 'JetBrains Mono', monospace;
  --radius-lg: 1rem;
  --radius-md: 0.75rem;
  --max-width: 900px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--bg-deepest);
  color: var(--text-primary);
  line-height: 1.75;
  font-size: 1.05rem;
  -webkit-font-smoothing: antialiased;
}

/* === HERO === */
.hero-section {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 6rem 2rem 4rem;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  z-index: 0;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg,
    rgba(12,12,29,0.93) 0%,
    rgba(18,18,34,0.87) 50%,
    rgba(124,58,237,0.12) 100%);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: var(--max-width);
  text-align: center;
}

.hero-venue {
  display: inline-block;
  background: rgba(124,58,237,0.2);
  border: 1px solid rgba(124,58,237,0.35);
  border-radius: 2rem;
  padding: 0.35rem 1.2rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--primary-light);
  margin-bottom: 1.5rem;
}

.hero-content h1 {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: #fff;
  margin-bottom: 1.2rem;
}

.hero-authors {
  font-size: 0.92rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  line-height: 1.6;
}

.hero-abstract {
  font-size: 1.08rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 2rem;
  text-align: left;
}

/* Metric Badges */
.metrics-row {
  display: flex;
  gap: 1.2rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}

.metric-badge {
  background: rgba(41,40,58,0.6);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1.5px solid rgba(74,68,85,0.25);
  border-radius: var(--radius-lg);
  padding: 1.2rem 1.5rem;
  text-align: center;
  min-width: 150px;
  transition: box-shadow 0.3s ease;
}
.metric-badge:hover {
  box-shadow: 0 0 50px rgba(210,187,255,0.06);
}

.metric-value {
  display: block;
  font-family: var(--font-mono);
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--primary-light);
  line-height: 1.1;
  margin-bottom: 0.3rem;
}

.metric-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: 0.03em;
}

/* Keyword Chips */
.keyword-chips {
  display: flex;
  gap: 0.5rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}

.chip {
  display: inline-block;
  background: var(--bg-container-highest);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  padding: 0.3rem 0.85rem;
  border-radius: 2rem;
  letter-spacing: 0.02em;
}

/* Hero Actions */
.hero-actions {
  margin-top: 0.5rem;
}

.btn {
  display: inline-block;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  color: #fff;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.75rem 2rem;
  border-radius: var(--radius-md);
  text-decoration: none;
  letter-spacing: 0.02em;
  transition: opacity 0.2s ease, transform 0.2s ease;
}
.btn:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

/* === CONTENT SECTIONS === */
.content-section {
  padding: 5rem 2rem;
}

.alt-bg {
  background: var(--bg-surface);
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
}

h2 {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 600;
  color: var(--primary-light);
  line-height: 1.25;
  margin-bottom: 1.5rem;
}

h3 {
  font-family: var(--font-body);
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.35;
  margin-bottom: 1rem;
  margin-top: 1.5rem;
}

h3:first-child { margin-top: 0; }

p {
  margin-bottom: 1.2rem;
  color: var(--text-secondary);
}

ul, ol {
  padding-left: 1.5rem;
  margin-bottom: 1.2rem;
}

li {
  margin-bottom: 0.6rem;
  color: var(--text-secondary);
}

li strong {
  color: var(--text-primary);
}

/* === GLASS CARD === */
.glass-card {
  background: rgba(41,40,58,0.55);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1.5px solid rgba(74,68,85,0.18);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin-bottom: 2rem;
  transition: box-shadow 0.3s ease;
}
.glass-card:hover {
  box-shadow: 0 0 40px rgba(210,187,255,0.04);
}

.accent-card {
  border-left: 3px solid var(--primary);
}

.conclusion-card {
  border-top: 3px solid var(--primary);
  background: rgba(41,40,58,0.7);
}

/* === FIGURES === */
.figure-card {
  margin-bottom: 1.5rem;
}

figure {
  background: var(--bg-container);
  border-radius: var(--radius-md);
  overflow: hidden;
  padding: 1rem;
}

figure img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 0.4rem;
}

figcaption {
  font-size: 0.88rem;
  color: var(--text-secondary);
  padding: 0.8rem 0 0;
  line-height: 1.5;
}

figcaption strong {
  color: var(--primary-light);
}

/* === TABLE === */
.table-card {
  overflow: hidden;
}

.table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  font-family: var(--font-mono);
}

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

th {
  padding: 0.75rem 0.6rem;
  text-align: left;
  font-weight: 600;
  color: var(--primary-light);
  font-size: 0.78rem;
  letter-spacing: 0.03em;
  white-space: nowrap;
  border-bottom: 1.5px solid var(--outline-variant);
}

td {
  padding: 0.6rem;
  border-bottom: 1px solid rgba(74,68,85,0.15);
  white-space: nowrap;
  color: var(--text-secondary);
}

td:first-child {
  font-weight: 500;
  color: var(--text-primary);
}

td.best {
  color: var(--primary-light);
  font-weight: 700;
}

tbody tr:hover {
  background: rgba(124,58,237,0.06);
}

/* === GRIDS === */
.two-col-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: start;
}

.three-col-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

/* === BEFORE/AFTER METRICS === */
.before-after-metrics {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}

.ba-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(30,30,47,0.7);
  border-radius: var(--radius-md);
  padding: 0.7rem 1.2rem;
  flex: 1;
  min-width: 200px;
}

.ba-label {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent);
  min-width: 80px;
}

.ba-before {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--text-secondary);
}

.ba-arrow {
  color: var(--primary-light);
  font-size: 1.1rem;
}

.ba-after {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--primary-light);
}

/* === CATEGORY BADGES === */
.category-metrics {
  display: flex;
  gap: 1rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.category-badge {
  background: rgba(30,30,47,0.8);
  border-radius: var(--radius-md);
  padding: 1rem 1.5rem;
  text-align: center;
  flex: 1;
  min-width: 140px;
}

.cat-count {
  display: block;
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1.1;
}

.cat-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-secondary);
  margin-top: 0.25rem;
}

/* === REFERENCES === */
details {
  background: var(--bg-container);
  border-radius: var(--radius-md);
  padding: 1rem 1.5rem;
}

summary {
  cursor: pointer;
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--primary-light);
  padding: 0.5rem 0;
  list-style: none;
}
summary::before {
  content: '+ ';
  font-family: var(--font-mono);
}
details[open] summary::before {
  content: '- ';
}

.references-list {
  padding: 1rem 0 0 1.5rem;
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.7;
}
.references-list li {
  margin-bottom: 0.4rem;
}

/* === EXPLANATION UI CLASSES === */
.flecto-note,
.flecto-callout,
.flecto-card,
.flecto-panel {
  position: relative;
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  margin: 1.2rem 0;
}

.flecto-note::before,
.flecto-callout::before,
.flecto-card::before,
.flecto-panel::before {
  content: '\1F916 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(96,165,250,0.08);
  border-left: 3px solid #60a5fa;
  font-size: 0.95rem;
}

.flecto-callout {
  background: rgba(124,58,237,0.1);
  border: 1px solid rgba(124,58,237,0.25);
}

.flecto-card {
  background: rgba(41,40,58,0.6);
  border: 1.5px solid rgba(74,68,85,0.2);
  box-shadow: 0 2px 12px rgba(0,0,0,0.2);
}

.flecto-panel {
  background: rgba(41,40,58,0.7);
  border: 1.5px solid rgba(74,68,85,0.25);
  padding: 1.5rem 2rem;
}

.flecto-note h4, .flecto-callout h4,
.flecto-card h4, .flecto-panel h4 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.flecto-note p, .flecto-callout p,
.flecto-card p, .flecto-panel p {
  font-size: 0.95rem;
  margin-bottom: 0.6rem;
}

.flecto-note ul, .flecto-callout ul,
.flecto-card ul, .flecto-panel ul {
  padding-left: 1.2rem;
}

/* === REVEAL ANIMATION === */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
}

/* === RESPONSIVE === */
@media (max-width: 768px) {
  .two-col-grid,
  .three-col-grid {
    grid-template-columns: 1fr;
  }

  .hero-section {
    padding: 4rem 1.2rem 3rem;
    min-height: auto;
  }

  .hero-content h1 {
    font-size: 1.8rem;
  }

  .metrics-row {
    flex-direction: column;
    align-items: center;
  }

  .metric-badge {
    min-width: 100%;
    max-width: 300px;
  }

  .before-after-metrics {
    flex-direction: column;
  }

  .content-section {
    padding: 3rem 1.2rem;
  }

  .glass-card {
    padding: 1.2rem;
  }

  h2 { font-size: 1.5rem; }

  table { font-size: 0.78rem; }
  th, td { padding: 0.4rem; }
}