/* === Variables === */
:root {
  --primary: #2E1065;
  --secondary: #4C1D95;
  --accent: #6D28D9;
  --accent-light: #8B5CF6;
  --bg: #F0EFF5;
  --surface: #FFFFFF;
  --text: #1A0B3E;
  --muted: #8B85A0;
  --line: #D5D0E5;
  --hero-bg: #1A0B3E;
  --hero-text: #F0EFF5;
  --code-bg: #1E1B2E;
  --code-text: #C4B5FD;
  --font-heading: 'Playfair Display', Georgia, serif;
  --font-body: 'Inter', 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
  --radius: 12px;
  --shadow: 0 2px 16px rgba(46, 16, 101, 0.08);
  --shadow-hover: 0 4px 24px rgba(109, 40, 217, 0.15);
  --max-w: 860px;
}

/* === Reset & Base === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
code, pre { font-family: var(--font-mono); }

/* === Container === */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

/* === Typography === */
h1 {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
}
h2 {
  font-family: var(--font-heading);
  font-size: clamp(1.4rem, 2.5vw, 1.9rem);
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 1.2rem;
}
h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 0.5rem;
}
p { margin-bottom: 1.2em; }
p:last-child { margin-bottom: 0; }
figcaption {
  font-size: 0.875rem;
  color: var(--muted);
  text-align: center;
  margin-top: 0.75em;
  font-style: italic;
}
figure { margin: 2rem 0; }
figure img {
  border-radius: var(--radius);
  border: 1px solid var(--line);
  margin: 0 auto;
}
ul, ol { padding-left: 1.5em; }
li { margin-bottom: 0.4em; }

/* === Sections === */
.section-light {
  padding: 80px 0;
  background: var(--bg);
}
.section-light.section-alt {
  background: #E8E6F0;
}
.section-results {
  padding: 80px 0;
  background: #EDE8F5;
}
.section-dark {
  padding: 80px 0;
  background: var(--primary);
  color: var(--hero-text);
}
.section-dark h2 { color: #E9D5FF; }
.section-dark h3 { color: #C4B5FD; }
.section-dark p { color: #DDD6FE; }
.section-dark a { color: #A78BFA; }

/* === Hero === */
.hero-section {
  position: relative;
  min-height: 540px;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  z-index: 0;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(46, 16, 101, 0.88) 0%, rgba(29, 7, 64, 0.94) 100%);
  z-index: 1;
}
.hero-content {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 100px 24px 80px;
  text-align: center;
  color: var(--hero-text);
}
.hero-meta-badge {
  display: inline-block;
  font-size: 0.8rem;
  color: #C4B5FD;
  background: rgba(109, 40, 217, 0.2);
  border: 1px solid rgba(139, 92, 246, 0.4);
  border-radius: 20px;
  padding: 4px 16px;
  margin-bottom: 1.5rem;
  letter-spacing: 0.04em;
  font-family: var(--font-mono);
}
.hero-title {
  background: linear-gradient(135deg, #F0EFF5 0%, #C4B5FD 50%, #A78BFA 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 1rem;
}
.hero-subtitle {
  font-size: 1.2rem;
  color: #DDD6FE;
  font-style: italic;
  margin-bottom: 0.75rem;
  font-weight: 300;
}
.hero-authors {
  font-size: 0.95rem;
  color: #C4B5FD;
  margin-bottom: 0.25rem;
}
.hero-affiliation {
  font-size: 0.9rem;
  color: #A78BFA;
  font-weight: 500;
  margin-bottom: 0.25rem;
}
.hero-date {
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 2rem;
  font-family: var(--font-mono);
}
.hero-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}
.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  border-radius: 8px;
  padding: 12px 28px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: background 0.2s, box-shadow 0.2s;
  text-decoration: none;
}
.btn:hover {
  background: #5B21B6;
  box-shadow: 0 0 20px rgba(109, 40, 217, 0.5);
  text-decoration: none;
}

/* === Abstract lead === */
.abstract-lead {
  font-size: 1.1rem;
  line-height: 1.85;
  border-left: 4px solid var(--accent);
  padding-left: 1.5em;
  margin-bottom: 2.5rem;
  color: var(--text);
}

/* === Highlight cards grid === */
.highlight-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 1.5rem;
}
@media (max-width: 700px) {
  .highlight-cards { grid-template-columns: 1fr; }
}
.metric-badge {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

/* === Three column grid === */
.three-col-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 2rem;
}
@media (max-width: 700px) {
  .three-col-grid { grid-template-columns: 1fr; }
}
.featured-card {
  border-top: 3px solid var(--accent) !important;
  background: #F5F3FF !important;
}

/* === Metrics row === */
.metrics-row {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin: 1.5rem 0;
}
.metric-chip {
  display: flex;
  flex-direction: column;
  align-items: center;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 24px;
  box-shadow: var(--shadow);
  flex: 1 1 120px;
}
.metric-num {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
}
.metric-label {
  font-size: 0.78rem;
  color: var(--muted);
  text-align: center;
  margin-top: 4px;
}

/* === Flecto UI classes === */
.flecto-note {
  position: relative;
  padding: 1.2em 1.5em 1.2em 1.75em;
  background: #F5F3FF;
  border-left: 3px solid var(--accent-light);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 0.95rem;
  margin: 1.5rem 0;
  color: var(--text);
}
.flecto-note::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-callout {
  position: relative;
  padding: 1.5em 1.75em;
  background: #EDE8F5;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin: 2rem 0;
}
.flecto-callout::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-callout h3 {
  margin-bottom: 0.75rem;
  font-size: 1.1rem;
}

.flecto-card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  transition: box-shadow 0.2s, transform 0.2s;
}
.flecto-card::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-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

.flecto-panel {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  margin: 2rem 0;
}
.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-panel table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1rem;
}
.flecto-panel th {
  background: var(--primary);
  color: #fff;
  padding: 10px 14px;
  text-align: left;
  font-size: 0.85rem;
}
.flecto-panel td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--line);
  font-size: 0.9rem;
}
.flecto-panel tr:last-child td { border-bottom: none; }
.highlight-row td { background: #EDE8F5; font-weight: 500; }

/* === Code snippet === */
.code-snippet {
  background: var(--code-bg);
  color: var(--code-text);
  border-radius: 8px;
  padding: 1.25em 1.5em;
  font-size: 0.875rem;
  overflow-x: auto;
  margin-top: 1rem;
}
.code-snippet code { color: inherit; }

/* === Accordion === */
.accordion {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin: 1.5rem 0;
  overflow: hidden;
}
.accordion summary {
  cursor: pointer;
  padding: 1rem 1.5rem;
  font-weight: 600;
  font-size: 0.95rem;
  background: var(--surface);
  color: var(--text);
  list-style: none;
  user-select: none;
  transition: background 0.2s;
}
.accordion summary:hover { background: #F5F3FF; }
.accordion[open] summary { background: #EDE8F5; border-bottom: 1px solid var(--line); }
.accordion-body {
  padding: 1.5rem;
  background: var(--surface);
}

/* === Tables === */
.table-scroll { overflow-x: auto; margin: 1.5rem 0; }
.games-table,
.perf-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
}
.games-table th,
.perf-table th {
  background: var(--primary);
  color: #fff;
  padding: 10px 12px;
  text-align: left;
  white-space: nowrap;
  font-size: 0.8rem;
}
.games-table td,
.perf-table td {
  padding: 7px 12px;
  border-bottom: 1px solid var(--line);
  color: var(--text);
}
.games-table tr:nth-child(even) td,
.perf-table tr:nth-child(even) td {
  background: #F8F7FC;
}
.table-note {
  font-size: 0.8rem;
  color: var(--muted);
  margin-top: 0.5rem;
}
.rate-full { background: #D1FAE5 !important; color: #065F46; font-weight: 600; }
.rate-low { background: #FEF3C7 !important; color: #92400E; }

/* === Conclusion grid === */
.conclusion-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin: 2rem 0;
}
@media (max-width: 700px) {
  .conclusion-grid { grid-template-columns: 1fr; }
}
.conclusion-card {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
}
.conclusion-icon {
  font-size: 1.5rem;
  display: block;
  margin-bottom: 0.5rem;
}
.conclusion-card p {
  font-size: 0.9rem;
  color: #DDD6FE;
  margin: 0;
}
.future-work-card {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius);
  padding: 24px;
  margin-top: 1.5rem;
}
.future-work-card h3 { color: #C4B5FD; margin-bottom: 0.75rem; }
.future-work-card li { color: #DDD6FE; font-size: 0.95rem; }

/* === References === */
.references-list {
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--text);
}
.references-list li { margin-bottom: 0.75rem; padding-left: 0.5em; }

/* === Reveal animation === */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 600ms ease-out, transform 600ms ease-out;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
  .reveal,
  .reveal.visible {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
}

/* === Responsive === */
@media (max-width: 600px) {
  .hero-content { padding: 60px 16px 40px; }
  .section-light, .section-results, .section-dark { padding: 48px 0; }
  h1 { font-size: 1.7rem; }
  h2 { font-size: 1.3rem; }
}