:root {
  color-scheme: light;
  --bg: #f4f6f3;
  --surface: #ffffff;
  --surface-2: #eef3ef;
  --ink: #141b18;
  --muted: #5e6a65;
  --subtle: #7b8782;
  --line: #dce4df;
  --line-strong: #c2cec7;
  --accent: #1f7a5a;
  --accent-strong: #15543f;
  --accent-soft: #dfeee5;
  --gold: #b8852c;
  --shadow: 0 18px 50px rgba(20, 27, 24, 0.08);
  --radius: 8px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    linear-gradient(180deg, rgba(223, 238, 229, 0.58), rgba(244, 246, 243, 0) 360px),
    var(--bg);
  color: var(--ink);
  line-height: 1.72;
  text-rendering: geometricPrecision;
}

a {
  color: var(--accent-strong);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--accent);
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -48px;
  z-index: 100;
  background: var(--ink);
  color: #fff;
  padding: 8px 12px;
  border-radius: 8px;
}

.skip-link:focus {
  top: 12px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  border-bottom: 1px solid rgba(220, 228, 223, 0.86);
  background: rgba(244, 246, 243, 0.9);
  backdrop-filter: blur(16px);
}

.nav {
  width: min(1160px, calc(100% - 32px));
  min-height: 70px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  text-decoration: none;
  font-weight: 750;
  white-space: nowrap;
}

.brand-mark {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: url("/assets/logo.svg") center / cover no-repeat;
  box-shadow: 0 1px 0 rgba(20, 27, 24, 0.08);
  flex: 0 0 auto;
}

.nav-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 14px;
}

.nav-links {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 4px;
  flex-wrap: wrap;
}

.nav-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.94rem;
  padding: 8px 10px;
  border-radius: 8px;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--ink);
  background: var(--accent-soft);
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 2px;
  background: rgba(255, 255, 255, 0.76);
  white-space: nowrap;
}

.lang-switch button {
  border: 0;
  background: transparent;
  color: var(--muted);
  border-radius: 6px;
  min-width: 46px;
  height: 30px;
  padding: 0 10px;
  font: inherit;
  font-size: 0.9rem;
  cursor: pointer;
}

.lang-switch button[aria-pressed="true"] {
  background: var(--accent-strong);
  color: #fff;
}

.hero {
  width: min(1160px, calc(100% - 32px));
  margin: 0 auto;
  padding: 74px 0 36px;
}

.hero-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(320px, 0.75fr);
  gap: 36px;
  align-items: stretch;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--accent-strong);
  font-size: 0.82rem;
  font-weight: 780;
  letter-spacing: 0;
}

h1,
h2,
h3 {
  line-height: 1.18;
  letter-spacing: 0;
}

h1 {
  margin: 0;
  max-width: 850px;
  font-size: clamp(2.35rem, 6vw, 5.15rem);
  text-wrap: balance;
}

h2 {
  margin: 0 0 18px;
  font-size: clamp(1.55rem, 3vw, 2.45rem);
}

h3 {
  margin: 30px 0 10px;
  font-size: 1.16rem;
}

p {
  margin: 0 0 16px;
}

.lead {
  margin-top: 22px;
  max-width: 760px;
  color: var(--muted);
  font-size: clamp(1.02rem, 2vw, 1.18rem);
}

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

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 10px 16px;
  border-radius: 8px;
  border: 1px solid var(--line-strong);
  background: var(--surface);
  color: var(--ink);
  font-weight: 700;
  text-decoration: none;
}

.button.primary {
  border-color: var(--accent-strong);
  background: var(--accent-strong);
  color: #fff;
}

.button:hover {
  transform: translateY(-1px);
}

.status-panel {
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow);
}

.status-panel h2 {
  font-size: 1.15rem;
  margin-bottom: 14px;
}

.status-list {
  display: grid;
  gap: 14px;
  margin: 0;
}

.status-item {
  display: grid;
  gap: 2px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.status-item:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.status-item dt {
  color: var(--subtle);
  font-size: 0.86rem;
}

.status-item dd {
  margin: 0;
  font-weight: 720;
}

.section {
  width: min(1160px, calc(100% - 32px));
  margin: 0 auto;
  padding: 34px 0 72px;
}

.section-header {
  max-width: 760px;
  margin-bottom: 20px;
}

.section-header p {
  color: var(--muted);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.card {
  min-height: 206px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 20px;
  color: var(--ink);
  text-decoration: none;
  box-shadow: 0 1px 0 rgba(20, 27, 24, 0.03);
}

.card:hover {
  border-color: #9fb7aa;
  box-shadow: 0 12px 34px rgba(20, 27, 24, 0.08);
}

.card-kicker {
  color: var(--gold);
  font-size: 0.78rem;
  font-weight: 780;
}

.card strong {
  display: block;
  margin-top: 10px;
  font-size: 1.18rem;
}

.card span {
  color: var(--muted);
  font-size: 0.95rem;
}

.apps-band {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.48);
}

.apps-inner {
  width: min(1160px, calc(100% - 32px));
  margin: 0 auto;
  padding: 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.chips {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.chip {
  border: 1px solid var(--line);
  background: var(--surface);
  border-radius: 999px;
  padding: 6px 10px;
  color: var(--muted);
  font-size: 0.9rem;
}

.page-hero {
  width: min(1160px, calc(100% - 32px));
  margin: 0 auto;
  padding: 58px 0 24px;
}

.page-hero h1 {
  font-size: clamp(2.2rem, 5vw, 4.2rem);
}

.page-grid {
  width: min(1160px, calc(100% - 32px));
  margin: 0 auto;
  padding: 18px 0 78px;
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 28px;
  align-items: start;
}

.toc {
  position: sticky;
  top: 92px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.76);
  padding: 16px;
}

.toc-title {
  margin: 0 0 10px;
  color: var(--subtle);
  font-size: 0.82rem;
  font-weight: 760;
}

.toc a {
  display: block;
  padding: 7px 0;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.94rem;
}

.toc a:hover {
  color: var(--accent-strong);
}

.doc {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  padding: clamp(24px, 5vw, 54px);
  box-shadow: 0 1px 0 rgba(20, 27, 24, 0.03);
}

.doc > :first-child {
  margin-top: 0;
}

.doc h2 {
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

.doc h2:first-of-type {
  border-top: 0;
  padding-top: 0;
}

.meta {
  color: var(--muted);
  font-size: 0.98rem;
  margin: 12px 0 30px;
}

.list {
  margin: 0 0 24px;
  padding-left: 1.25rem;
}

.list li {
  margin: 8px 0;
}

.note {
  margin: 28px 0;
  padding: 18px 20px;
  border-left: 4px solid var(--accent);
  background: var(--accent-soft);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.contact-panel {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 26px 0;
}

.info-tile {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  background: var(--surface-2);
}

.info-tile strong {
  display: block;
  margin-bottom: 6px;
}

[data-lang-panel] {
  display: none;
}

.lang-hans [data-lang-panel="hans"],
.lang-hant [data-lang-panel="hant"] {
  display: block;
}

.site-footer {
  border-top: 1px solid var(--line);
  background: #eef2ee;
  padding: 32px 0;
}

.footer-inner {
  width: min(1160px, calc(100% - 32px));
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 18px 28px;
  color: var(--muted);
  font-size: 0.92rem;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.footer-brand strong {
  color: var(--ink);
}

.footer-links {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-links a,
.icp-link {
  color: var(--muted);
}

.icp-row {
  grid-column: 1 / -1;
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

@media (max-width: 960px) {
  .nav {
    min-height: auto;
    padding: 16px 0;
    align-items: flex-start;
    flex-direction: column;
  }

  .nav-actions {
    width: 100%;
    align-items: flex-start;
    justify-content: space-between;
    gap: 14px;
  }

  .nav-links {
    justify-content: flex-start;
  }

  .hero-layout,
  .page-grid {
    grid-template-columns: 1fr;
  }

  .toc {
    position: static;
  }

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

@media (max-width: 640px) {
  .nav-actions,
  .apps-inner,
  .contact-panel {
    align-items: flex-start;
    flex-direction: column;
    grid-template-columns: 1fr;
  }

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

  .footer-inner {
    grid-template-columns: 1fr;
  }

  .footer-links {
    justify-content: flex-start;
  }
}