/* The landing page is a quiet entry point; research counts remain API backed. */
html { scroll-behavior: smooth; }
body.sci-home, body.sci-downloads { margin: 0; min-width: 320px; color: var(--sci-text); background: var(--sci-bg); font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif; }
.sci-home *, .sci-downloads * { box-sizing: border-box; }
.sci-main { width: min(1440px, 100%); margin: 0 auto; padding: 0 clamp(20px, 4vw, 72px); }
.sci-eyebrow { display: inline-flex; align-items: center; gap: 10px; color: var(--sci-mint); font-size: 12px; font-weight: 550; letter-spacing: .16em; line-height: 1.6; }
.sci-eyebrow::before { content: ""; width: 22px; height: 1px; background: currentColor; }
.sci-button { display: inline-flex; align-items: center; justify-content: center; gap: 18px; min-height: 46px; padding: 12px 20px; border-radius: 7px; border: 1px solid #345249; background: #182d2b; color: var(--sci-mint); font-size: 14px; font-weight: 550; line-height: 1.5; text-decoration: none; transition: background .2s, border-color .2s, transform .2s; cursor: pointer; }
.sci-button:hover { background: #203b34; border-color: #599881; transform: translateY(-2px); }
.sci-button.primary { background: var(--sci-mint); color: #09261f; border-color: var(--sci-mint); }
.sci-button.primary:hover { background: #acf5e2; }
.sci-button:focus-visible, .dataset-card:focus-visible, .sci-demo-link:focus-visible { outline: 2px solid var(--sci-mint); outline-offset: 4px; }
.sci-hero { min-height: 552px; display: grid; grid-template-columns: 1.05fr .95fr; position: relative; align-items: center; gap: 14px; padding: 62px 0 56px; }
.hero-copy { position: relative; z-index: 2; max-width: 680px; }
.hero-copy h1 { font-size: clamp(36px, 4.4vw, 66px); font-weight: 520; letter-spacing: -.045em; line-height: 1.18; margin: 24px 0; }
.hero-copy h1 span { display: block; color: var(--sci-mint); }
.hero-copy p { max-width: 520px; color: var(--sci-muted); font-size: 16px; line-height: 1.95; margin: 0; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.hero-caption { display: flex; align-items: center; gap: 9px; color: #8b9dac; font-size: 13px; margin-top: 22px; }
.status-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--sci-mint); box-shadow: 0 0 0 4px #87ead00c; flex: none; }
.hero-art { height: 430px; position: relative; min-width: 0; isolation: isolate; }
.orbit-viewport { position: absolute; inset: 0; display: grid; place-items: center; perspective: 720px; overflow: hidden; }
.orbit-viewport::before { content: ""; position: absolute; inset: 12%; border-radius: 50%; background: radial-gradient(circle, #2e716b22, transparent 69%); }
.orbit-viewport::after { content: ""; position: absolute; width: 82%; height: 1px; background: linear-gradient(90deg, transparent, #59766d55, transparent); bottom: 60px; }
.orbital-system { width: 260px; height: 260px; position: relative; transform-style: preserve-3d; transform: rotateX(-18deg) rotateZ(-19deg); }
.orbital-sphere { position: absolute; inset: 0; transform-style: preserve-3d; animation: sci-orbit-spin 45s linear infinite; }
.orbital-meridian { position: absolute; inset: 0; border: 1px solid #87ead04b; border-radius: 50%; box-shadow: inset 0 0 10px #87ead005; }
.orbital-latitude { position: absolute; border: 1px solid #87ead034; border-radius: 50%; }
.orbital-particle { position: absolute; top: 50%; left: 50%; width: 3px; height: 3px; border-radius: 50%; background: #b9ffeb; box-shadow: 0 0 6px #87ead060; }
.orbital-ring { position: absolute; inset: -48px; border: 1px solid #87ead048; border-radius: 50%; transform: rotateX(76deg); transform-style: preserve-3d; }
.orbital-ring.second { inset: -25px; border-color: #b1d4f42d; transform: rotateX(63deg) rotateY(38deg); }
.orbital-ring.third { inset: -72px; border-color: #87ead018; transform: rotateX(67deg) rotateY(-26deg); }
.orbital-ring::before { content: ""; position: absolute; top: 50%; left: -4px; width: 8px; height: 8px; border-radius: 50%; background: #caffed; box-shadow: 0 0 16px #87ead0; }
.orbit-center { position: absolute; inset: 75px; background: radial-gradient(circle at 35% 30%, #8dcab023, #10343a0a 65%); border: 1px solid #a1efd712; border-radius: 50%; }
.orbit-label { position: absolute; color: #a2bbbf; font: 11px/1.5 ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: .09em; padding: 7px 10px; background: #0c1820b8; border: 1px solid #2b474652; border-radius: 4px; }
.orbit-label.top { top: 58px; right: 14px; }
.orbit-label.bottom { bottom: 84px; left: 14px; }
.art-caption { position: absolute; left: 0; right: 0; bottom: 7px; display: flex; justify-content: center; align-items: center; gap: 14px; color: #738997; font-size: 11px; letter-spacing: .07em; }
.motion-toggle { color: #acc0c9; background: #11212a; border: 1px solid #28413d; border-radius: 5px; padding: 5px 8px; font-size: 12px; cursor: pointer; }
.hero-art.is-paused .orbital-sphere { animation-play-state: paused; }
@keyframes sci-orbit-spin { to { transform: rotateY(360deg); } }
.overview-stats { display: grid; grid-template-columns: repeat(3, 1fr); border: 1px solid var(--sci-line); border-radius: 10px; background: #0e1923; }
.overview-stats>div { padding: 25px 28px; border-right: 1px solid var(--sci-line); }
.overview-stats>div:last-child { border-right: 0; }
.overview-stats strong { font-size: clamp(26px, 2.5vw, 36px); font-weight: 510; letter-spacing: -.035em; font-variant-numeric: tabular-nums; display: block; }
.overview-stats span { display: block; margin-top: 9px; color: #9cafbd; font-size: 14px; line-height: 1.6; }
.catalog-section { padding: 68px 0 44px; scroll-margin-top: 25px; }
.section-intro { display: flex; align-items: end; justify-content: space-between; gap: 22px; margin-bottom: 25px; }
.section-intro h2 { font-size: 30px; font-weight: 520; letter-spacing: -.025em; margin: 10px 0 0; }
.section-intro p { color: var(--sci-muted); font-size: 14px; line-height: 1.75; max-width: 420px; margin: 0; }
.dataset-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 15px; }
.dataset-card { display: flex; flex-direction: column; min-width: 0; min-height: 287px; padding: 23px; border: 1px solid var(--sci-line); border-radius: 10px; background: linear-gradient(150deg, #14222d, #0e1823 80%); text-decoration: none; color: inherit; position: relative; transition: border-color .2s, background .2s, transform .2s; }
.dataset-card:hover { transform: translateY(-4px); border-color: #568373; background: linear-gradient(150deg, #19352e, #101c25 85%); }
.dataset-top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 23px; }
.dataset-symbol { color: var(--sci-mint); font-size: 17px; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: -.03em; }
.dataset-status { font-size: 11px; letter-spacing: .04em; color: #9abcb0; }
.dataset-card h3 { font-size: 20px; letter-spacing: -.015em; font-weight: 560; margin: 0 0 7px; }
.dataset-subtitle { color: var(--sci-muted); font-size: 13px; line-height: 1.65; margin: 0; }
.dataset-card .dataset-description { font-size: 14px; color: #9bafbd; line-height: 1.8; margin: 17px 0 22px; flex: 1; }
.dataset-bottom { display: flex; align-items: end; gap: 10px; justify-content: space-between; padding-top: 15px; border-top: 1px solid #2c3c465e; }
.dataset-count { color: #d5e6e8; font-size: 13px; line-height: 1.6; font-variant-numeric: tabular-nums; }
.dataset-arrow { color: var(--sci-mint); font-size: 20px; flex: none; }
.demo-section { padding: 25px 0 55px; }
.demo-section .section-intro { align-items: start; }
.demo-section h2 { font-size: 24px; }
.demo-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px; }
.sci-demo-link { display: flex; align-items: center; gap: 13px; padding: 18px; border: 1px solid var(--sci-line); border-radius: 7px; text-decoration: none; color: var(--sci-text); background: #0d1822; transition: background .2s, border-color .2s; }
.sci-demo-link:hover { background: #172832; border-color: #4f7268; }
.sci-demo-link>span { color: #8caaad; font: 12px ui-monospace, SFMono-Regular, Menlo, monospace; }
.sci-demo-link div { display: grid; gap: 5px; min-width: 0; }
.sci-demo-link b { font-size: 14px; font-weight: 520; }
.sci-demo-link small { color: #96aaba; font-size: 12px; }
.sci-demo-link i { margin-left: auto; color: #8ca8a9; font-style: normal; }
.catalog-notice { margin: 20px 0 0; color: #8098a7; font-size: 13px; line-height: 1.7; }
.catalog-notice.is-error { color: #dbc493; }
@media (max-width: 1150px) { .dataset-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } .hero-copy h1 { font-size: 46px; } .hero-art { height: 390px; } .demo-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); } .orbital-system { scale: .87; } }
@media (max-width: 760px) {
  .sci-hero { grid-template-columns: 1fr; padding-top: 38px; padding-bottom: 28px; gap: 10px; }
  .hero-copy h1 { font-size: clamp(34px, 7.7vw, 48px); line-height: 1.22; margin: 19px 0; }
  .hero-copy p { font-size: 15px; }
  .hero-actions { margin-top: 24px; }
  .sci-button { gap: 12px; padding: 11px 16px; }
  .hero-art { height: 290px; }
  .orbital-system { scale: .68; }
  .orbit-label.top { top: 25px; right: 0; }
  .orbit-label.bottom { bottom: 55px; left: 0; }
  .art-caption { bottom: 0; }
  .overview-stats { grid-template-columns: 1fr; }
  .overview-stats>div { display: flex; align-items: center; justify-content: space-between; gap: 15px; border-right: 0; border-bottom: 1px solid var(--sci-line); padding: 20px; }
  .overview-stats>div:last-child { border-bottom: 0; }
  .overview-stats strong { font-size: 26px; }
  .overview-stats span { margin: 0; text-align: right; max-width: 145px; font-size: 13px; }
  .catalog-section { padding: 44px 0 28px; }
  .section-intro { display: block; }
  .section-intro h2 { font-size: 27px; }
  .section-intro p { margin-top: 13px; }
  .dataset-card { min-height: 265px; padding: 20px; }
  .demo-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .sci-demo-link { padding: 15px 12px; gap: 9px; }
}
@media (max-width: 510px) { .dataset-grid { grid-template-columns: 1fr; } .dataset-card { min-height: 240px; } .dataset-top { margin-bottom: 18px; } .demo-grid { grid-template-columns: 1fr; } .hero-caption { font-size: 12px; } .sci-eyebrow { font-size: 10px; } }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } .orbital-sphere { animation: none; transform: rotateY(25deg); } .sci-button, .dataset-card, .sci-demo-link { transition: none; } .sci-button:hover, .dataset-card:hover { transform: none; } }