:root {
  --bg: #f6f8fb;
  --surface: #ffffff;
  --surface-alt: #eef3f9;
  --text: #152033;
  --muted: #5f6d85;
  --line: #d9e2ee;
  --accent: #2557d6;
  --accent-soft: #e7eeff;
  --shadow: 0 14px 34px rgba(16, 24, 40, 0.08);
  --radius: 22px;
  --container: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, #f9fbff 0%, #f3f6fb 100%);
  line-height: 1.65;
}
img { display: block; width: 100%; height: auto; border-radius: 16px; }
a { color: inherit; text-decoration: none; }
p { margin: 0; }
figure { margin: 0; }
code, pre { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }

.container {
  width: min(calc(100% - 32px), var(--container));
  margin: 0 auto;
}
.narrow { width: min(calc(100% - 32px), 860px); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(12px);
  background: rgba(246, 248, 251, 0.78);
  border-bottom: 1px solid rgba(217, 226, 238, 0.75);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  gap: 24px;
}

.brand {
  font-weight: 800;
  letter-spacing: -0.02em;
}

.nav {
  display: flex;
  gap: 20px;
  color: var(--muted);
  font-size: 0.96rem;
}

.nav a:hover { color: var(--text); }

.hero {
  padding: 72px 0 24px;
}

.hero-inner {
  text-align: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 700;
  font-size: 0.9rem;
  margin-bottom: 16px;
}

h1 {
  margin: 0 auto;
  max-width: 1000px;
  font-size: clamp(2rem, 5vw, 3.6rem);
  line-height: 1.08;
  letter-spacing: -0.04em;
}

.authors,
.affiliation,
.note,
.results-summary {
  color: var(--muted);
}

.authors {
  margin-top: 20px;
  font-size: 1.05rem;
}

.affiliation {
  margin-top: 8px;
}

.hero-actions {
  margin-top: 28px;
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: #fff;
  box-shadow: var(--shadow);
  font-weight: 700;
  transition: transform 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.button:hover {
  transform: translateY(-1px);
  border-color: #b8c7df;
}

.button.primary {
  background: var(--accent);
  color: white;
  border-color: transparent;
}

.button.small {
  min-height: 38px;
  padding: 0 14px;
  box-shadow: none;
}

.section {
  padding: 42px 0;
}

.section-tight {
  padding-top: 8px;
}

.alt {
  background: rgba(238, 243, 249, 0.55);
  border-top: 1px solid rgba(217, 226, 238, 0.8);
  border-bottom: 1px solid rgba(217, 226, 238, 0.8);
}

.section-head {
  margin-bottom: 24px;
}

.section-head h2,
#abstract h2,
#citation h2 {
  margin: 0 0 8px;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  letter-spacing: -0.03em;
}

.section-head p,
#abstract p,
#citation p,
figcaption,
.caption {
  color: var(--muted);
}

.card {
  background: var(--surface);
  border: 1px solid rgba(217, 226, 238, 0.95);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.hero-figure,
.media-card,
.highlight-card,
.detail-card,
.qual-card,
.code-block {
  padding: 18px;
}

.hero-figure figcaption,
.media-card figcaption {
  margin-top: 12px;
  font-size: 0.95rem;
}

.contrib-grid,
.method-grid {
  display: grid;
  gap: 18px;
}

.contrib-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.method-grid {
  margin-top: 18px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.highlight-index,
.qual-index {
  display: inline-flex;
  font-weight: 800;
  color: var(--accent);
  margin-bottom: 12px;
}

.highlight-card h3,
.detail-card h3,
.qual-meta h3 {
  margin: 0 0 10px;
  font-size: 1.1rem;
}

.highlight-card p,
.detail-card p,
.qual-meta p {
  color: var(--muted);
}

.architecture-card {
  margin-bottom: 18px;
}

.qual-list {
  display: grid;
  gap: 18px;
}

.qual-meta {
  margin-bottom: 16px;
}

.qual-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.comparison-panel {
  position: relative;
}

.panel-label {
  position: absolute;
  top: 14px;
  left: 14px;
  z-index: 1;
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(21, 32, 51, 0.86);
  color: white;
  font-size: 0.84rem;
  font-weight: 800;
}

.panel-label.success {
  background: rgba(37, 87, 214, 0.92);
}

.results-summary {
  margin-top: 18px;
}

.code-block {
  margin-top: 14px;
  background: #0f1728;
  color: #e9eefb;
}

.code-block pre {
  margin: 0 0 14px;
  white-space: pre-wrap;
  word-break: break-word;
  font-size: 0.94rem;
  line-height: 1.6;
}

.site-footer {
  padding: 28px 0 44px;
}

.footer-inner {
  color: var(--muted);
  font-size: 0.95rem;
  text-align: center;
}

@media (max-width: 960px) {
  .contrib-grid,
  .method-grid,
  .qual-grid {
    grid-template-columns: 1fr;
  }

  .nav {
    display: none;
  }
}

@media (max-width: 640px) {
  .hero {
    padding-top: 48px;
  }

  .section {
    padding: 32px 0;
  }

  .hero-figure,
  .media-card,
  .highlight-card,
  .detail-card,
  .qual-card,
  .code-block {
    padding: 14px;
  }
}