:root {
  --bg: #071015;
  --bg-soft: #0d1a21;
  --surface: rgba(12, 22, 28, 0.82);
  --surface-strong: rgba(16, 27, 34, 0.92);
  --surface-soft: rgba(255, 255, 255, 0.035);
  --stroke: rgba(207, 225, 235, 0.14);
  --stroke-strong: rgba(207, 225, 235, 0.24);
  --text: #f5f0e8;
  --muted: #98aab6;
  --muted-strong: #c7d4db;
  --accent: #87d8ff;
  --accent-soft: rgba(135, 216, 255, 0.14);
  --gold: #e6c98a;
  --display: "Avenir Next", "SF Pro Display", "Segoe UI Variable", "Helvetica Neue", Arial, sans-serif;
  --sans: "Avenir Next", "SF Pro Display", "Segoe UI Variable", "Helvetica Neue", Arial, sans-serif;
  --shadow: 0 40px 120px rgba(0, 0, 0, 0.34);
}
* { box-sizing: border-box; }
html {
  background: #071015;
  color-scheme: dark;
  scroll-behavior: smooth;
}
html[data-lang="zh"] {
  --display: "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --sans: "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", sans-serif;
}
body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--sans);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-feature-settings: "liga" 1, "kern" 1;
  background:
    radial-gradient(circle at 12% 14%, rgba(135, 216, 255, 0.16), transparent 28%),
    radial-gradient(circle at 85% 12%, rgba(230, 201, 138, 0.12), transparent 24%),
    radial-gradient(circle at 50% 120%, rgba(79, 106, 124, 0.18), transparent 35%),
    linear-gradient(180deg, #0a1318 0%, #071015 100%);
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 88px 88px;
  mask-image: linear-gradient(180deg, rgba(0,0,0,0.48), transparent 78%);
  opacity: 0.18;
}
body::after {
  content: "";
  position: fixed;
  inset: 18px;
  pointer-events: none;
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 28px;
  opacity: 0.55;
}
a { color: inherit; text-decoration: none; }
button {
  font: inherit;
}
.lang-copy[data-lang-copy="zh"] {
  display: none;
}
html[data-lang="zh"] .lang-copy[data-lang-copy="en"] {
  display: none;
}
html[data-lang="zh"] .lang-copy[data-lang-copy="zh"] {
  display: inline;
}
.shell { width: min(1240px, calc(100% - 48px)); margin: 0 auto; position: relative; z-index: 1; }
.topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(22px);
  background: rgba(5, 10, 14, 0.56);
  border-bottom: 1px solid rgba(255,255,255,0.05);
}
.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 20px 0 16px;
}
.topbar-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 14px;
  flex-wrap: wrap;
}
.brand {
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
}
.brand-mark {
  font-size: 9px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--gold);
  font-weight: 700;
}
.brand-title {
  font-size: 16px;
  font-weight: 620;
  letter-spacing: -0.02em;
}
.nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 10px;
}
.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  padding: 4px;
  border-radius: 999px;
  border: 1px solid var(--stroke);
  background: rgba(255,255,255,0.04);
}
.lang-button {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--muted);
  min-height: 36px;
  min-width: 50px;
  padding: 0 12px;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  cursor: pointer;
  transition: background 180ms ease, color 180ms ease, transform 180ms ease;
}
.lang-button:hover {
  color: var(--text);
  transform: translateY(-1px);
}
.lang-button.is-active {
  color: #081116;
  background: linear-gradient(180deg, #f0e4ca, #e4c991);
}
.nav a {
  padding: 9px 13px;
  border-radius: 999px;
  border: 1px solid transparent;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 500;
  letter-spacing: -0.005em;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease, color 180ms ease;
}
.nav a:hover,
.nav a.active {
  color: var(--text);
  border-color: var(--stroke);
  background: rgba(255,255,255,0.045);
  transform: translateY(-1px);
}
.hero {
  padding: 72px 0 24px;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 9px 14px;
  border-radius: 999px;
  background: rgba(135, 216, 255, 0.08);
  border: 1px solid rgba(135, 216, 255, 0.16);
  color: var(--accent);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-weight: 700;
}
.hero-grid {
  margin-top: 22px;
  display: grid;
  gap: 24px;
  grid-template-columns: minmax(0, 1.28fr) minmax(300px, 0.72fr);
  align-items: stretch;
}
.hero-card {
  border: 1px solid var(--stroke);
  background: linear-gradient(180deg, rgba(14, 23, 29, 0.9), rgba(9, 15, 20, 0.84));
  box-shadow: var(--shadow);
  border-radius: 38px;
  overflow: hidden;
}
.hero-main {
  position: relative;
  padding: 40px 40px 36px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.hero-main::before {
  content: "";
  position: absolute;
  inset: -1px;
  background:
    radial-gradient(circle at top left, rgba(135, 216, 255, 0.18), transparent 28%),
    radial-gradient(circle at bottom right, rgba(230, 201, 138, 0.12), transparent 24%);
  opacity: 0.95;
  pointer-events: none;
}
.hero-main > * { position: relative; z-index: 1; }
.hero-copy {
  max-width: 47rem;
}
.hero-kicker {
  margin: 0 0 14px;
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}
.hero-main h1 {
  margin: 0;
  max-width: 12.5ch;
  font-family: var(--display);
  font-size: clamp(2.95rem, 4.9vw, 4.4rem);
  line-height: 1.02;
  letter-spacing: -0.05em;
  font-weight: 620;
  text-wrap: balance;
}
html[data-lang="zh"] .hero-main h1 {
  max-width: 11.2ch;
  font-size: clamp(2.5rem, 4.15vw, 3.7rem);
  line-height: 1.18;
  letter-spacing: -0.012em;
  font-weight: 620;
}
.hero-main p {
  margin: 16px 0 0;
  max-width: 54ch;
  color: var(--muted-strong);
  font-size: 0.98rem;
  line-height: 1.72;
  letter-spacing: -0.01em;
}
html[data-lang="zh"] .hero-main p,
html[data-lang="zh"] .mini-panel p,
html[data-lang="zh"] .card p,
html[data-lang="zh"] .repo-summary,
html[data-lang="zh"] .section-head p {
  line-height: 1.8;
}
.hero-tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin-top: 22px;
}
.hero-tag {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 0 13px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,0.08);
  background: rgba(255,255,255,0.045);
  color: var(--text);
  font-size: 0.82rem;
  font-weight: 520;
  letter-spacing: -0.01em;
}
.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 16px;
  border-radius: 999px;
  border: 1px solid var(--stroke);
  color: var(--text);
  background: rgba(255,255,255,0.04);
  font-size: 0.92rem;
  font-weight: 560;
  letter-spacing: -0.01em;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}
.button:hover {
  transform: translateY(-1px);
  border-color: var(--stroke-strong);
  background: rgba(255,255,255,0.06);
}
.button.primary {
  color: #081116;
  background: linear-gradient(180deg, #9ce0ff, #7bcef4);
  border-color: transparent;
  font-weight: 700;
}
.button.primary:hover {
  background: linear-gradient(180deg, #a9e5ff, #87d8ff);
}
.hero-side {
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  justify-content: space-between;
}
.stat {
  padding: 20px 0 18px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.stat:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}
.stat-value {
  margin-top: 10px;
  font-size: 1.1rem;
  line-height: 1.7;
  color: var(--text);
  letter-spacing: -0.02em;
}
.quote-panel,
.mini-panel,
.card,
.repo-card,
.footer-box {
  background: rgba(255,255,255,0.032);
}
.quote-panel {
  padding: 20px;
  border-radius: 24px;
  border: 1px solid rgba(255,255,255,0.06);
  background:
    linear-gradient(180deg, rgba(255,255,255,0.04), rgba(255,255,255,0.02)),
    radial-gradient(circle at top left, rgba(230, 201, 138, 0.12), transparent 42%);
}
.quote-kicker,
.mini-panel span,
.card-index,
.repo-meta,
.stat-label {
  font-size: 9px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--gold);
  font-weight: 700;
}
.quote-text {
  margin: 14px 0 0;
  font-family: var(--display);
  font-size: clamp(1.32rem, 2.1vw, 1.86rem);
  line-height: 1.16;
  letter-spacing: -0.03em;
  font-weight: 600;
  text-wrap: balance;
}
html[data-lang="zh"] .quote-text {
  font-size: clamp(1.24rem, 2vw, 1.7rem);
  line-height: 1.26;
  letter-spacing: -0.01em;
}
.mini-panel-grid {
  display: grid;
  gap: 12px;
}
.mini-panel {
  padding: 18px;
  border-radius: 22px;
  border: 1px solid rgba(255,255,255,0.06);
}
.mini-panel strong {
  display: block;
  margin-top: 10px;
  font-size: 0.98rem;
  line-height: 1.38;
  letter-spacing: -0.018em;
  font-weight: 620;
}
.mini-panel p {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 0.91rem;
  line-height: 1.64;
  letter-spacing: -0.01em;
}
.section {
  padding: 20px 0 56px;
}
.section-head {
  display: grid;
  gap: 16px;
  grid-template-columns: minmax(0, 0.92fr) minmax(280px, 0.68fr);
  align-items: end;
  margin-bottom: 18px;
}
.section-head h2 {
  margin: 8px 0 0;
  font-family: var(--display);
  font-size: clamp(1.42rem, 2.35vw, 2rem);
  line-height: 1.08;
  letter-spacing: -0.03em;
  font-weight: 620;
  text-wrap: balance;
}
.section-head p {
  margin: 0;
  color: var(--muted);
  font-size: 0.93rem;
  line-height: 1.7;
  letter-spacing: -0.01em;
}
.card-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}
.card {
  padding: 20px;
  border: 1px solid var(--stroke);
  border-radius: 24px;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}
.card:hover,
.repo-card:hover {
  transform: translateY(-2px);
  border-color: rgba(135, 216, 255, 0.28);
  background: rgba(255,255,255,0.05);
}
.card.featured {
  grid-column: span 2;
  background:
    linear-gradient(180deg, rgba(255,255,255,0.04), rgba(255,255,255,0.02)),
    radial-gradient(circle at top right, rgba(135, 216, 255, 0.10), transparent 42%);
}
.card h3 {
  margin: 14px 0 8px;
  font-size: 0.96rem;
  line-height: 1.42;
  letter-spacing: -0.015em;
  font-weight: 620;
}
.card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.65;
  letter-spacing: -0.01em;
}
.repo-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
.repo-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 22px;
  border: 1px solid var(--stroke);
  border-radius: 24px;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}
.repo-card--featured {
  grid-column: span 2;
  background:
    linear-gradient(180deg, rgba(255,255,255,0.04), rgba(255,255,255,0.02)),
    radial-gradient(circle at top left, rgba(230, 201, 138, 0.12), transparent 38%);
}
.repo-title {
  font-size: 1rem;
  font-weight: 620;
  line-height: 1.4;
  letter-spacing: -0.02em;
}
.repo-summary {
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.66;
  letter-spacing: -0.01em;
  max-width: 54ch;
}
.repo-arrow {
  margin-top: auto;
  color: var(--accent);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 620;
}
.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.chip {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-height: 42px;
  padding: 0 14px;
  border-radius: 999px;
  border: 1px solid var(--stroke);
  background: rgba(255,255,255,0.04);
  color: var(--text);
  font-size: 0.84rem;
  font-weight: 520;
  letter-spacing: -0.01em;
}
.chip small {
  color: var(--gold);
  font-size: 9px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 700;
}
html[data-lang="zh"] .hero-kicker,
html[data-lang="zh"] .eyebrow,
html[data-lang="zh"] .quote-kicker,
html[data-lang="zh"] .mini-panel span,
html[data-lang="zh"] .card-index,
html[data-lang="zh"] .repo-meta,
html[data-lang="zh"] .stat-label,
html[data-lang="zh"] .chip small,
html[data-lang="zh"] .brand-mark {
  letter-spacing: 0.12em;
}
.footer {
  padding: 10px 0 64px;
  color: var(--muted);
}
.footer-box {
  padding: 22px 24px;
  border: 1px solid var(--stroke);
  border-radius: 24px;
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(240px, 0.8fr);
  gap: 16px;
}
.footer-box strong {
  font-size: 0.98rem;
  letter-spacing: -0.02em;
  font-weight: 620;
}
.footer-box a {
  color: var(--text);
  font-size: 0.9rem;
  line-height: 1.8;
}
@media (max-width: 920px) {
  body::after { inset: 10px; border-radius: 20px; }
  .shell { width: min(100% - 28px, 1240px); }
  .hero-grid,
  .section-head,
  .card-grid,
  .repo-grid { grid-template-columns: 1fr; }
  .card.featured,
  .repo-card--featured { grid-column: span 1; }
  .topbar-inner { align-items: flex-start; flex-direction: column; }
  .topbar-actions { width: 100%; justify-content: space-between; }
  .nav { justify-content: flex-start; }
  .hero-main { padding: 28px 24px 26px; }
  .hero-side { padding: 18px; }
  .quote-text { font-size: 1.72rem; }
  .footer-box { grid-template-columns: 1fr; }
}