/* === CUA-Suite Paper HTML Bundle === */
/* Palette: ocean_depths */

:root {
  --primary: #0D3B66;
  --secondary: #1B6B93;
  --accent: #14919B;
  --bg: #EDF2F7;
  --surface: #FFFFFF;
  --text: #0A1628;
  --muted: #6B8299;
  --line: #C8D6E0;
  --shadow: rgba(10, 22, 40, 0.06);
  --radius: 8px;
  --radius-sm: 4px;
  --max-w: 960px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  font-size: 18px;
  line-height: 1.7;
  color: var(--text);
  background-color: var(--bg);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

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

a:hover {
  color: var(--secondary);
  text-decoration: underline;
}

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

section {
  padding: 80px 0;
}

/* === Hero === */
.hero {
  position: relative;
  min-height: 520px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 100px 0;
}

.hero__bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  z-index: 0;
  will-change: transform;
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(13,59,102,0.9) 0%, rgba(27,107,147,0.85) 100%);
  z-index: 1;
}

.hero__content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 800px;
  padding: 0 24px;
}

.hero__title {
  font-size: 2.4rem;
  font-weight: 800;
  color: #FFFFFF;
  line-height: 1.2;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.hero__authors {
  font-size: 1rem;
  color: rgba(255,255,255,0.85);
  margin-bottom: 8px;
  line-height: 1.5;
}

.hero__affiliations {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.6);
  margin-bottom: 24px;
}

.hero__link {
  display: inline-block;
  padding: 10px 28px;
  background: var(--accent);
  color: #FFFFFF;
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: background 0.2s ease, transform 0.2s ease;
}

.hero__link:hover {
  background: #0E7A83;
  text-decoration: none;
  transform: translateY(-1px);
}

/* === Key Metrics === */
.metrics {
  background: var(--surface);
}

.metrics__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 24px;
}

.metric-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  box-shadow: 0 2px 8px var(--shadow);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.metric-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(10,22,40,0.1);
}

.metric-card__number {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1.1;
  margin-bottom: 8px;
}

.metric-card__label {
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.4;
}

/* === Section Headings === */
.section-title {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 32px;
  letter-spacing: -0.01em;
}

.section-title::after {
  content: '';
  display: block;
  width: 48px;
  height: 3px;
  background: var(--accent);
  margin-top: 12px;
  border-radius: 2px;
}

/* === Ecosystem === */
.ecosystem {
  background: var(--bg);
}

.source-figure {
  margin: 32px 0;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 2px 12px var(--shadow);
  border: 1px solid var(--line);
}

.source-figure img {
  width: 100%;
}

.source-figure__caption {
  padding: 12px 16px;
  font-size: 0.85rem;
  color: var(--muted);
  background: var(--surface);
  border-top: 1px solid var(--line);
}

.component-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-top: 40px;
}

.component-card {
  background: var(--surface);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 2px 8px var(--shadow);
  border: 1px solid var(--line);
}

.component-card__header {
  background: var(--primary);
  color: #FFFFFF;
  padding: 14px 20px;
  font-weight: 700;
  font-size: 1.05rem;
}

.component-card__body {
  padding: 20px;
}

.component-card__body ul {
  list-style: none;
  padding: 0;
}

.component-card__body li {
  padding: 6px 0;
  font-size: 0.92rem;
  line-height: 1.5;
  border-bottom: 1px solid var(--line);
}

.component-card__body li:last-child {
  border-bottom: none;
}

.component-card__body li::before {
  content: '\2713';
  color: var(--accent);
  font-weight: 700;
  margin-right: 8px;
}

/* === Dataset Comparison === */
.comparison {
  background: var(--surface);
}

.highlight-text {
  color: var(--accent);
  font-weight: 600;
}

.table-wrapper {
  overflow-x: auto;
  margin: 24px 0;
  border-radius: var(--radius);
  border: 1px solid var(--line);
}

.source-table-img {
  width: 100%;
  display: block;
}

.prose {
  margin-bottom: 24px;
  line-height: 1.8;
}

/* === Evaluation === */
.evaluation {
  background: var(--bg);
  position: relative;
}

.evaluation__bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: 0.12;
  z-index: 0;
  pointer-events: none;
}

.evaluation .container {
  position: relative;
  z-index: 1;
}

.eval-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  margin-bottom: 40px;
}

.eval-block {
  background: var(--surface);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 2px 8px var(--shadow);
  border: 1px solid var(--line);
}

.eval-block__header {
  padding: 14px 20px;
  background: var(--primary);
  color: #FFFFFF;
  font-weight: 700;
  font-size: 1rem;
}

.eval-block__body {
  padding: 20px;
}

.eval-block__body p {
  font-size: 0.92rem;
  margin-bottom: 12px;
}

.callout {
  background: linear-gradient(135deg, rgba(13,59,102,0.04) 0%, rgba(20,145,155,0.06) 100%);
  border-left: 4px solid var(--accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 20px 24px;
  margin: 24px 0;
  font-size: 0.95rem;
}

/* === App Diversity === */
.app-diversity {
  background: var(--surface);
}

.stat-highlight {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--accent);
}

.performance-range {
  display: flex;
  align-items: center;
  gap: 16px;
  margin: 24px 0;
  padding: 20px;
  background: var(--bg);
  border-radius: var(--radius);
}

.performance-range__bar {
  flex: 1;
  height: 8px;
  background: linear-gradient(to right, #C53030, #ECC94B, #38A169);
  border-radius: 4px;
}

.performance-range__labels {
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--muted);
  margin-top: 4px;
}

/* === Trajectory Demo === */
.trajectory {
  background: var(--bg);
}

.annotation-layers {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin: 24px 0 40px;
}

.annotation-layer {
  padding: 16px;
  border-radius: var(--radius-sm);
  background: var(--surface);
  border-left: 4px solid;
  box-shadow: 0 1px 4px var(--shadow);
}

.annotation-layer--observation { border-color: #3182CE; }
.annotation-layer--thought { border-color: #38A169; }
.annotation-layer--action { border-color: #DD6B20; }
.annotation-layer--reflection { border-color: #805AD5; }

.annotation-layer__title {
  font-weight: 700;
  font-size: 0.9rem;
  margin-bottom: 4px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.annotation-layer--observation .annotation-layer__title { color: #3182CE; }
.annotation-layer--thought .annotation-layer__title { color: #38A169; }
.annotation-layer--action .annotation-layer__title { color: #DD6B20; }
.annotation-layer--reflection .annotation-layer__title { color: #805AD5; }

.annotation-layer__desc {
  font-size: 0.85rem;
  color: var(--muted);
}

.trajectory-gallery {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 24px;
}

.trajectory-gallery__item {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 2px 8px var(--shadow);
  border: 1px solid var(--line);
}

.trajectory-gallery__item img {
  width: 100%;
}

.trajectory-gallery__label {
  padding: 8px 12px;
  font-size: 0.8rem;
  color: var(--muted);
  background: var(--surface);
  text-align: center;
  border-top: 1px solid var(--line);
}

/* === Conclusion === */
.conclusion {
  background: var(--surface);
}

.frontiers-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin: 32px 0;
}

.frontier-card {
  padding: 24px 20px;
  background: var(--bg);
  border-left: 4px solid var(--primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.frontier-card__title {
  font-weight: 700;
  font-size: 1rem;
  color: var(--primary);
  margin-bottom: 8px;
}

.frontier-card__desc {
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.5;
}

.cta-block {
  text-align: center;
  padding: 40px 0;
  margin-top: 40px;
  border-top: 1px solid var(--line);
}

.cta-block a {
  display: inline-block;
  padding: 12px 32px;
  background: var(--accent);
  color: #FFFFFF;
  border-radius: 6px;
  font-weight: 600;
  font-size: 1rem;
  transition: background 0.2s ease;
}

.cta-block a:hover {
  background: #0E7A83;
  text-decoration: none;
}

.cta-block p {
  margin-top: 12px;
  font-size: 0.85rem;
  color: var(--muted);
}

/* === Reveal Animation === */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

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

/* === Responsive === */
@media (max-width: 768px) {
  .hero__title {
    font-size: 1.6rem;
  }

  section {
    padding: 48px 0;
  }

  .eval-grid {
    grid-template-columns: 1fr;
  }

  .trajectory-gallery {
    grid-template-columns: 1fr;
  }

  .metrics__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .section-title {
    font-size: 1.4rem;
  }
}

@media (max-width: 480px) {
  body {
    font-size: 16px;
  }

  .metrics__grid {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: 400px;
    padding: 60px 0;
  }
}

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

  .hero__bg {
    will-change: auto;
  }
}

/* AI Explanation UI */
.flecto-note, .flecto-callout, .flecto-card, .flecto-panel {
  position: relative;
  border-radius: 8px;
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  font-size: 0.95rem;
}
.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 {
  border-left: 3px solid #60a5fa;
  background: rgba(96, 165, 250, 0.08);
}
.flecto-callout {
  background: rgba(99, 102, 241, 0.12);
  border: 1px solid rgba(99, 102, 241, 0.3);
}
.flecto-card {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.15);
  box-shadow: 0 2px 8px rgba(0,0,0,0.3);
}
.flecto-panel {
  background: rgba(30,30,50,0.8);
  border: 1px solid rgba(100,100,200,0.3);
}
.flecto-note h4, .flecto-callout h4, .flecto-card h4, .flecto-panel h4 {
  margin: 0.5em 0 0.3em;
  font-size: 1rem;
  color: #0D3B66;
}
.flecto-card ul, .flecto-panel ul { padding-left: 1.5em; }