:root {
  --bg: #f6f7fb;
  --surface: #fff;
  --text: #182033;
  --muted: #687187;
  --border: rgb(30 41 59 / 10%);
  --accent: #6366f1;
  --accent-soft: rgb(99 102 241 / 9%);
  --warn-bg: rgb(217 130 43 / 10%);
  --warn-text: #9a5b12;
  --radius: 16px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d111a;
    --surface: #171e2d;
    --text: #edf1f8;
    --muted: #9ca6b8;
    --border: rgb(255 255 255 / 9%);
    --accent: #818cf8;
    --accent-soft: rgb(129 140 248 / 12%);
    --warn-bg: rgb(217 130 43 / 14%);
    --warn-text: #e5a75b;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", system-ui, sans-serif;
  font-size: 15px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

code,
kbd {
  padding: 2px 6px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--accent-soft);
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.88em;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  max-width: 900px;
  margin: 0 auto;
  padding: 24px 24px 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand strong {
  font-size: 15px;
}

.brand img {
  border-radius: 8px;
}

.version {
  color: var(--muted);
  font-size: 12px;
}

main {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 24px 24px;
}

.hero {
  padding: 48px 0 40px;
}

.kicker {
  margin: 0 0 10px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.hero h1 {
  margin: 0 0 16px;
  font-size: clamp(28px, 5vw, 40px);
  line-height: 1.25;
  letter-spacing: -0.01em;
}

.lead {
  max-width: 620px;
  margin: 0 0 28px;
  color: var(--muted);
  font-size: 15px;
}

.downloads {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.download-card {
  display: grid;
  gap: 2px;
  padding: 18px 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: inherit;
  text-decoration: none;
  transition: border-color 160ms ease, transform 160ms ease;
}

.download-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.download-label {
  font-size: 15px;
  font-weight: 700;
}

.download-note {
  color: var(--muted);
  font-size: 12px;
}

.download-size {
  margin-top: 6px;
  color: var(--muted);
  font-size: 12px;
}

.download-action {
  margin-top: 10px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
}

.notice {
  padding: 16px 18px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}

.notice-warn {
  border-color: transparent;
  background: var(--warn-bg);
  color: var(--warn-text);
}

.notice p {
  margin: 6px 0 0;
  font-size: 13px;
}

.section {
  padding: 32px 0;
  border-top: 1px solid var(--border);
}

.section h2 {
  margin: 0 0 6px;
  font-size: 19px;
}

.section-lead {
  margin: 0 0 20px;
  color: var(--muted);
  font-size: 14px;
}

.section > p {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 14px;
}

.feature-grid {
  display: grid;
  gap: 12px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.feature-grid li {
  padding: 18px 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}

.feature-grid h3 {
  margin: 0 0 6px;
  font-size: 14px;
}

.feature-grid p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.install-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.install-card {
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}

.install-card h3 {
  margin: 0 0 12px;
  font-size: 14px;
}

.install-card ol {
  margin: 0;
  padding-left: 20px;
  color: var(--muted);
  font-size: 13px;
}

.install-card li {
  margin-bottom: 6px;
}

.note {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 12px;
}

.share-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.share-list li {
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  font-size: 13px;
}

footer {
  max-width: 900px;
  margin: 0 auto;
  padding: 28px 24px 48px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 12px;
}

footer p {
  margin: 0 0 4px;
}

@media (max-width: 640px) {
  .topbar,
  main,
  footer {
    padding-left: 18px;
    padding-right: 18px;
  }

  .hero {
    padding: 32px 0 28px;
  }
}