:root {
  color-scheme: light;
  --bg: #ffffff;
  --bg-muted: #f6f8fa;
  --border: #d0d7de;
  --text: #1f2328;
  --text-muted: #656d76;
  --link: #0969da;
  --link-hover: #0550ae;
  --accent: #0969da;
  --max-width: 980px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
}

a {
  color: var(--link);
  text-decoration: none;
}

a:hover {
  color: var(--link-hover);
  text-decoration: underline;
}

.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}

.site-header-inner,
.page,
.site-footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 16px 24px;
}

.site-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text);
  font-weight: 600;
  font-size: 18px;
}

.brand img {
  width: 32px;
  height: 32px;
  border-radius: 8px;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  font-size: 14px;
}

.nav a {
  color: var(--text-muted);
}

.nav a:hover,
.nav a[aria-current="page"] {
  color: var(--text);
  text-decoration: none;
}
.lang-toggle {
  margin-left: 4px;
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-muted);
  color: var(--text-muted);
  font-size: 13px;
  font-weight: 600;
  line-height: 1.4;
  cursor: pointer;
}

.lang-toggle:hover {
  color: var(--text);
  border-color: #afb8c1;
}

html[data-lang="en"] .lang-zh {
  display: none !important;
}

html[data-lang="zh"] .lang-en {
  display: none !important;
}

.hero {
  padding: 48px 24px 32px;
  max-width: var(--max-width);
  margin: 0 auto;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 40px;
  align-items: center;
}

@media (max-width: 768px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }
}

.hero h1 {
  margin: 0 0 12px;
  font-size: 40px;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.hero p.lead {
  margin: 0 0 24px;
  color: var(--text-muted);
  font-size: 18px;
}

.hero-icon {
  width: 160px;
  height: 160px;
  border-radius: 28px;
  box-shadow: 0 8px 24px rgba(31, 35, 40, 0.12);
}

.pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 24px;
}

.pill {
  display: inline-block;
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg-muted);
  color: var(--text-muted);
  font-size: 13px;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.button {
  display: inline-block;
  padding: 10px 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-muted);
  color: var(--text);
  font-size: 14px;
  font-weight: 600;
}

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

.button:hover {
  text-decoration: none;
  filter: brightness(0.98);
}

.section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px 40px;
}

.section h2 {
  margin: 0 0 16px;
  font-size: 24px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

@media (max-width: 768px) {
  .feature-grid {
    grid-template-columns: 1fr;
  }
}

.card {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  background: var(--bg);
}

.card h3 {
  margin: 0 0 8px;
  font-size: 16px;
}

.card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 14px;
}

.page h1 {
  margin: 0 0 8px;
  font-size: 32px;
}

.page .subtitle {
  margin: 0 0 32px;
  color: var(--text-muted);
}

.page h2 {
  margin: 32px 0 12px;
  font-size: 20px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.page p,
.page li {
  color: var(--text);
}

.page ul {
  padding-left: 20px;
}

.page li {
  margin-bottom: 8px;
}

.meta {
  color: var(--text-muted);
  font-size: 14px;
}

.faq dt {
  font-weight: 600;
  margin-top: 20px;
}

.faq dd {
  margin: 8px 0 0;
  color: var(--text-muted);
}

.site-footer {
  border-top: 1px solid var(--border);
  margin-top: 48px;
  color: var(--text-muted);
  font-size: 14px;
}