:root {
  --bg: #e7f3f0;
  --bg-soft: #f4faf8;
  --ink: #1b242c;
  --muted: #5d6c74;
  --teal: #2c7c74;
  --teal-deep: #173f3b;
  --line: rgba(23, 63, 59, 0.08);
  --card: #ffffff;
  --shadow: 0 10px 28px rgba(23, 63, 59, 0.06);
  --radius: 18px;
  --max: 1080px;
  --sans: Inter, "Segoe UI", "PingFang SC", "Noto Sans SC", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
}
img { max-width: 100%; display: block; }
a { color: inherit; }
button, input { font-family: inherit; }

.wrap {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
  min-width: 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(231, 243, 240, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
}
.site-header.scrolled { border-bottom-color: var(--line); }
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 68px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--teal);
  font-weight: 700;
  letter-spacing: -0.02em;
}
.brand svg { display: block; }
.nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 6px 18px;
}
.nav a {
  text-decoration: none;
  color: #607078;
  font-size: 14.5px;
}
.nav a:hover { color: var(--teal-deep); }

.hero {
  padding: 72px 0 28px;
  text-align: center;
}
.hero h1 {
  max-width: 920px;
  margin: 0 auto;
  font-size: clamp(28px, 4.2vw, 46px);
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--teal);
  font-weight: 700;
}
.hero .subtitle {
  max-width: 680px;
  margin: 18px auto 0;
  color: #3c4b53;
  font-size: 17.5px;
}
.authors {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 15px;
}
.authors a { color: var(--teal-deep); }
.badges, .button-row, .logo-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}
.badges { margin-top: 22px; }
.badge, .btn, .logo-card, .chip {
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(255, 255, 255, 0.9);
  box-shadow: 0 6px 16px rgba(23, 63, 59, 0.04);
}
.badge {
  border-radius: 999px;
  padding: 7px 14px;
  color: #3e5258;
  font-size: 14px;
}
.badge strong { color: var(--teal-deep); font-weight: 700; }
.badge.emphasis {
  background: var(--teal-deep);
  color: #fff;
  font-weight: 700;
}
.button-row { margin-top: 18px; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  border-radius: 14px;
  padding: 11px 16px;
  color: var(--ink);
  font-weight: 600;
  font-size: 14.5px;
}
.btn:hover { transform: translateY(-1px); }
.btn.disabled {
  color: #7d8b92;
  cursor: default;
}
.btn svg { width: 16px; height: 16px; }
.logo-row { margin-top: 22px; gap: 14px; }
.logo-card {
  border-radius: 16px;
  padding: 14px 22px;
  min-width: 180px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.logo-card img { height: 58px; width: auto; }
.shot { display: block; margin-top: 14px; }
.shot img { width: 100%; border-radius: 14px; }

.section { padding: 56px 0; }
.section.band { background: linear-gradient(180deg, rgba(255,255,255,0.35), rgba(255,255,255,0.12)); }
.section h2 {
  margin: 0;
  font-size: clamp(28px, 4vw, 36px);
  letter-spacing: -0.03em;
  text-align: center;
}
.lede {
  max-width: 760px;
  margin: 10px auto 0;
  text-align: center;
  color: var(--muted);
}

.split {
  display: grid;
  grid-template-columns: 1.35fr 0.9fr;
  gap: 28px;
  align-items: start;
}
.split h2, .panel h3, .card h3 { text-align: left; }
.prose p { margin: 0 0 12px; color: #243038; }
.prose p:last-child { margin-bottom: 0; }
.panel, .card, .stat, .figure-frame, .table-card, .resource-card, .page-card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.panel { padding: 22px 24px; }
.panel h3 { margin: 0 0 10px; font-size: 18px; }
.panel ol { margin: 0; padding-left: 18px; color: #2a3840; }
.panel li + li { margin-top: 8px; }

.cards-3, .cards-steps, .stats {
  display: grid;
  gap: 14px;
}
.cards-3 { grid-template-columns: repeat(3, 1fr); margin-top: 28px; }
.cards-steps { grid-template-columns: repeat(2, 1fr); margin-top: 28px; }
.stats { grid-template-columns: repeat(4, 1fr); margin-top: 26px; }
.card { padding: 20px 20px 18px; }
.card h3 { margin: 0 0 8px; font-size: 17px; }
.card p, .step p, .page-card p { margin: 0; color: var(--muted); }
.stat { padding: 18px 10px 16px; text-align: center; }
.stat b {
  display: block;
  color: var(--teal);
  font-size: 34px;
  letter-spacing: -0.03em;
  line-height: 1.1;
}
.stat span { color: var(--muted); font-size: 14px; }

.kicker {
  display: inline-block;
  margin: 0 auto 10px;
  padding: 4px 10px;
  border-radius: 999px;
  background: #d7ebe6;
  color: #21564f;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.center { text-align: center; }

.bench-grid {
  display: grid;
  grid-template-columns: 1.3fr 0.9fr;
  gap: 14px;
  margin-top: 14px;
  align-items: start;
}
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chips-center { justify-content: center; margin-top: 10px; }
.band-label {
  margin: 22px 0 0;
  text-align: center;
  font-size: 16px;
}
.aspect-cards { align-items: stretch; }
.aspect-cards .card h3 { margin-bottom: 12px; }
.chip {
  border-radius: 999px;
  padding: 6px 10px;
  font-size: 13px;
  color: #2d4448;
  box-shadow: none;
}
.chip em {
  font-style: normal;
  color: var(--teal);
  font-weight: 700;
  margin-right: 4px;
}

.figure-frame { margin-top: 18px; padding: 14px 14px 12px; position: relative; }
.figure-viewport {
  background: var(--bg-soft);
  border-radius: 14px;
  min-height: 280px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.figure-viewport img { width: 100%; height: auto; }
.placeholder {
  padding: 36px 20px;
  text-align: center;
  color: var(--muted);
}
.placeholder strong { display: block; color: var(--teal-deep); margin-bottom: 6px; }
.caption {
  margin: 10px 8px 2px;
  text-align: center;
  color: #526066;
  font-size: 14px;
}
.carousel-btn {
  position: absolute;
  top: 46%;
  width: 36px;
  height: 36px;
  border: 0;
  border-radius: 50%;
  background: #fff;
  box-shadow: var(--shadow);
  color: var(--teal-deep);
  cursor: pointer;
}
.carousel-btn.prev { left: -6px; }
.carousel-btn.next { right: -6px; }
.dots { display: flex; justify-content: center; gap: 6px; margin-top: 8px; }
.dots button {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  border: 0;
  background: #c5d8d4;
  padding: 0;
  cursor: pointer;
}
.dots button.on { background: var(--teal); }

.highlights {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 26px;
}
.tabs {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin-top: 26px;
}
.tabs button {
  border: 0;
  background: #fff;
  color: var(--ink);
  border-radius: 999px;
  padding: 8px 14px;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(23, 63, 59, 0.05);
}
.tabs button.on { background: var(--teal-deep); color: #fff; }
.tab-panel { display: none; margin-top: 16px; }
.tab-panel.on { display: block; }
.tab-panel .intro {
  margin: 0 auto 14px;
  max-width: 820px;
  text-align: center;
  color: #314148;
}
.tab-panel { min-width: 0; max-width: 100%; }
.table-card { padding: 8px 8px 14px; overflow-x: auto; max-width: 100%; min-width: 0; }
table { width: 100%; border-collapse: collapse; font-size: 14px; min-width: 640px; }
th, td { padding: 10px 12px; text-align: left; white-space: nowrap; }
th {
  color: #21564f;
  font-weight: 700;
  background: #f3faf8;
  position: sticky;
  top: 0;
}
td:first-child, th:first-child { white-space: normal; min-width: 180px; }
tr + tr td { border-top: 1px solid #eef3f2; }
.table-caption, .table-note {
  margin: 8px 12px 0;
  color: var(--muted);
  font-size: 13px;
}
.table-caption { font-weight: 650; color: #314148; }
.result-figure { margin-bottom: 14px; }

.page-card { padding: 18px; min-width: 0; max-width: 100%; }
.page-card h3 { margin: 0 0 6px; }
.page-actions { margin: 12px 0; }
.frame-wrap {
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: #fff;
}
.frame-wrap iframe { width: 100%; max-width: 100%; border: 0; display: block; background: #fff; }
.slot-note {
  margin-top: 8px;
  padding: 28px 16px;
  text-align: center;
  color: var(--muted);
  background: var(--bg-soft);
  border-radius: 14px;
}

.resource-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: 14px;
  margin-top: 22px;
}
.resource-card { padding: 20px; min-width: 0; max-width: 100%; }
.resource-card h3 { margin: 0 0 10px; }
pre {
  margin: 0;
  padding: 14px;
  background: #f4faf8;
  border-radius: 12px;
  overflow-x: auto;
  max-width: 100%;
  font-size: 12.5px;
  line-height: 1.45;
  color: #1d3330;
}
.resource-card p { color: #314148; }
.link-list { margin: 0; padding-left: 18px; }
.link-list a { color: var(--teal-deep); }

.site-footer {
  padding: 28px 0 36px;
  color: var(--muted);
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
  border-top: 1px solid rgba(23, 63, 59, 0.1);
  padding-top: 18px;
}
.site-footer strong { color: var(--teal-deep); }
.site-footer a { color: var(--teal-deep); }

@media (max-width: 900px) {
  .split, .bench-grid, .cards-3, .cards-steps, .stats, .highlights, .resource-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }
  .cards-3, .cards-steps { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 640px) {
  .wrap { width: min(var(--max), calc(100% - 28px)); }
  .header-inner { align-items: flex-start; flex-direction: column; gap: 8px; padding: 10px 0; }
  .nav { justify-content: flex-start; }
  .hero { padding-top: 36px; }
  .split, .bench-grid, .stats, .highlights, .resource-grid { grid-template-columns: minmax(0, 1fr); }
  .stat b { font-size: 28px; }
}