:root {
  --bg: #0b1020;
  --bg-soft: #111832;
  --card: #151d3a;
  --line: #243056;
  --text: #e6ecff;
  --muted: #9aa6c7;
  --brand: #4f8cff;
  --brand-2: #7c5cff;
  --accent: #22d3ee;
  --good: #34d399;
  --warn: #f59e0b;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
html, body { margin: 0; padding: 0; }

body {
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(124, 92, 255, .25), transparent 60%),
    radial-gradient(900px 500px at -10% 20%, rgba(79, 140, 255, .2), transparent 60%),
    var(--bg);
  background-attachment: fixed;
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
.container { max-width: 1120px; margin: 0 auto; padding: 0 24px; }
main { flex: 1; }

/* ---------- Nav ---------- */
nav.site-nav {
  position: sticky; top: 0; z-index: 10;
  backdrop-filter: blur(10px);
  background: rgba(11, 16, 32, .72);
  border-bottom: 1px solid var(--line);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
a.logo { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; color: var(--text); }
a.logo:hover { text-decoration: none; opacity: .85; }
.logo-mark {
  width: 28px; height: 28px; border-radius: 8px;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 14px; color: #fff; font-weight: 800;
}
.nav-links { display: flex; gap: 26px; font-size: 14px; }
.nav-links a { color: var(--muted); position: relative; padding: 4px 0; }
.nav-links a:hover { color: var(--text); text-decoration: none; }
.nav-links a.active { color: #fff; }
.nav-links a.active::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -4px; height: 2px;
  background: linear-gradient(90deg, var(--brand), var(--accent)); border-radius: 2px;
}

/* Hamburger (mobile) */
.nav-toggle {
  display: none; background: none; border: 1px solid var(--line);
  color: var(--text); width: 40px; height: 40px; border-radius: 10px;
  font-size: 18px; cursor: pointer;
}
.mobile-menu {
  display: none; border-top: 1px solid var(--line); padding: 10px 0 16px;
  flex-direction: column; gap: 4px;
}
.mobile-menu.open { display: flex; }
.mobile-menu a { color: var(--muted); padding: 10px 4px; font-size: 15px; }
.mobile-menu a.active { color: #fff; }
/* Gitee / GitHub 按钮（导航栏内紧凑尺寸） */
.nav-ctas { display: flex; align-items: center; gap: 8px; }
.nav-cta { padding: 6px 12px; font-size: 13px; border-radius: 8px; gap: 5px; line-height: 1.3; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 18px; border-radius: 10px; font-weight: 600; font-size: 14px;
  border: 1px solid var(--line); cursor: pointer; transition: .2s;
}
.btn-primary {
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  color: #fff; border: none;
}
.btn-primary:hover { filter: brightness(1.1); text-decoration: none; }
.btn-ghost { background: transparent; color: var(--text); }
.btn-ghost:hover { border-color: var(--brand); text-decoration: none; }
.btn-lg { padding: 14px 24px; font-size: 15px; }

/* ---------- Hero ---------- */
.hero { padding: 84px 0 64px; }
.badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 12px; border-radius: 999px; font-size: 12px; color: var(--muted);
  border: 1px solid var(--line); background: rgba(255, 255, 255, .03);
  margin-bottom: 20px;
}
.badge .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--good); }
h1 {
  font-size: 52px; line-height: 1.15; margin: 0 0 18px; font-weight: 800;
}
h1.gradient {
  background: linear-gradient(180deg, #fff 30%, #b9c4ea 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
h1 .accent {
  background: linear-gradient(90deg, var(--brand), var(--accent));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.lead { font-size: 18px; color: var(--muted); max-width: 720px; margin: 0 0 30px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.stats { display: flex; gap: 40px; margin-top: 52px; flex-wrap: wrap; }
.stat b { font-size: 28px; display: block; color: #fff; }
.stat span { font-size: 13px; color: var(--muted); }

/* ---------- Page header (子页) ---------- */
.page-header { padding: 64px 0 36px; }
.page-header h1 { font-size: 40px; margin-bottom: 12px; }
.page-header p { color: var(--muted); font-size: 17px; max-width: 720px; margin: 0; }

/* ---------- Sections ---------- */
section { padding: 56px 0; border-top: 1px solid var(--line); }
section:first-child { border-top: none; }
h2 { font-size: 30px; margin: 0 0 8px; }
h3 { font-size: 19px; }
.sub { color: var(--muted); margin: 0 0 36px; max-width: 720px; }

/* ---------- Cards / grid ---------- */
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.card {
  background: linear-gradient(180deg, rgba(255, 255, 255, .035), rgba(255, 255, 255, 0));
  border: 1px solid var(--line); border-radius: 14px; padding: 22px;
  transition: .2s; height: 100%;
}
.card:hover { border-color: var(--brand); transform: translateY(-2px); }
.card .icon {
  width: 38px; height: 38px; border-radius: 10px;
  background: rgba(79, 140, 255, .15); color: var(--brand);
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 18px; margin-bottom: 14px;
}
.card h3 { margin: 0 0 8px; font-size: 17px; }
.card p { margin: 0; color: var(--muted); font-size: 14px; }
.card .tags { margin-top: 12px; display: flex; flex-wrap: wrap; gap: 6px; }
.card .tags span {
  font-size: 12px; color: var(--muted); border: 1px solid var(--line);
  padding: 2px 9px; border-radius: 999px;
}

/* ---------- Chips ---------- */
.chips { display: flex; flex-wrap: wrap; gap: 10px; }
.chip {
  padding: 8px 14px; border-radius: 999px; font-size: 13px;
  background: rgba(255, 255, 255, .04); border: 1px solid var(--line); color: var(--text);
}

/* ---------- 友情链接 ---------- */
.friend-links { display: flex; flex-wrap: wrap; gap: 10px; }
a.friend-link { color: var(--text); transition: .2s; }
a.friend-link:hover {
  border-color: var(--brand); color: #fff; text-decoration: none;
  transform: translateY(-1px);
}

/* ---------- Demo ---------- */
.demo-url { font-size: 16px; padding: 2px 10px; }
.demo-account {
  margin-top: 22px; padding-top: 16px; border-top: 1px solid var(--line);
}
.demo-account p { margin: 0 0 10px; color: var(--muted); font-size: 14px; }
.demo-account .chips { justify-content: center; }

/* ---------- Stack 分组 ---------- */
.stack-group { margin-bottom: 34px; }
.stack-group h3 { display: flex; align-items: center; gap: 10px; margin: 0 0 14px; font-size: 17px; }
.stack-group h3 .emoji { font-size: 20px; }

/* ---------- Code ---------- */
pre {
  background: #0a0f22; border: 1px solid var(--line); border-radius: 12px;
  padding: 18px; overflow: auto; font-size: 13px; line-height: 1.7; color: #cdd6f4;
}
code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
p code, li code {
  background: rgba(255, 255, 255, .06); padding: 2px 6px; border-radius: 6px; font-size: 13px;
}

/* ---------- Two col ---------- */
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; align-items: start; }

/* ---------- API ---------- */
.api-endpoint {
  display: flex; align-items: center; gap: 10px;
  border: 1px solid var(--line); border-radius: 10px; padding: 12px 16px;
  margin-bottom: 10px; background: rgba(255, 255, 255, .02);
}
.api-endpoint .method {
  font-size: 11px; font-weight: 700; padding: 3px 9px; border-radius: 6px;
  background: rgba(52, 211, 153, .15); color: var(--good); letter-spacing: .5px;
}
.api-endpoint code { font-size: 13px; }
.api-endpoint .desc { margin-left: auto; color: var(--muted); font-size: 13px; }

/* ---------- CTA ---------- */
.cta {
  text-align: center; border: 1px solid var(--line); border-radius: 16px;
  padding: 48px 24px; margin: 20px 0;
  background: linear-gradient(180deg, rgba(79, 140, 255, .08), rgba(124, 92, 255, .05));
}
.cta h2 { margin-bottom: 10px; }
.cta p { color: var(--muted); margin: 0 0 24px; }
.cta .hero-actions { justify-content: center; }

/* ---------- Footer ---------- */
footer.site-footer {
  padding: 40px 0; border-top: 1px solid var(--line);
  color: var(--muted); font-size: 13px; text-align: center; margin-top: 40px;
}

/* ---------- 404 ---------- */
.error-page { text-align: center; padding: 120px 0; }
.error-page .code {
  font-size: 96px; font-weight: 800; margin: 0;
  background: linear-gradient(90deg, var(--brand), var(--accent));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.error-page p { color: var(--muted); }

/* ---------- Responsive ---------- */
@media (max-width: 820px) {
  .grid, .grid-2 { grid-template-columns: 1fr; }
  .two-col { grid-template-columns: 1fr; }
  h1 { font-size: 36px; }
  .page-header h1 { font-size: 30px; }
  .nav-links, .nav-ctas { display: none; }
  .nav-toggle { display: inline-flex; align-items: center; justify-content: center; }
  .stats { gap: 26px; }
  .api-endpoint .desc { display: none; }
}