:root {
  --bg: #f4f7fb;
  --surface: #ffffff;
  --text: #152033;
  --muted: #5b6475;
  --border: #e5eaf2;
  --accent: #2563eb;
  --accent-2: #0891b2;
  --soft: #eff6ff;
  --soft-2: #ecfeff;
  --ok: #16a34a;
  --warn: #d97706;
  --danger: #dc2626;
  --shadow: 0 12px 32px rgba(21, 32, 51, 0.07);
  --code-bg: #0f172a;
  --code-text: #e2e8f0;
  --radius: 18px;
  --max: 1100px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 0% 0%, #dbeafe 0%, transparent 34%),
    radial-gradient(circle at 100% 0%, #cffafe 0%, transparent 28%),
    var(--bg);
  min-height: 100vh;
  line-height: 1.7;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

img { max-width: 100%; display: block; }
code, pre, kbd {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

.page { min-height: 100vh; display: flex; flex-direction: column; }
.container { width: min(var(--max), calc(100% - 40px)); margin: 0 auto; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid rgba(229, 234, 242, 0.9);
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(12px);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text);
  font-weight: 800;
  font-size: 1.05rem;
  text-decoration: none;
  flex-shrink: 0;
}

.brand:hover { text-decoration: none; }

.logo {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  color: #fff;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 8px 18px rgba(37, 99, 235, 0.25);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.nav-links a {
  color: var(--muted);
  padding: 8px 12px;
  border-radius: 10px;
  font-size: 0.94rem;
  font-weight: 500;
  text-decoration: none;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--accent);
  background: var(--soft);
  text-decoration: none;
}

.menu-toggle {
  display: none;
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 10px;
  padding: 8px 12px;
  color: var(--text);
  cursor: pointer;
}

/* Main */
main { flex: 1; padding: 28px 0 56px; }

.hero,
.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 24px;
  box-shadow: var(--shadow);
  padding: 36px 40px;
}

.hero { margin-bottom: 22px; }

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border-radius: 999px;
  background: #ecfdf5;
  color: var(--ok);
  font-size: 0.84rem;
  font-weight: 700;
  margin-bottom: 14px;
}

.badge::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--ok);
  box-shadow: 0 0 0 4px rgba(22, 163, 74, 0.14);
}

.badge.warn {
  background: #fff7ed;
  color: var(--warn);
}

.badge.warn::before {
  background: var(--warn);
  box-shadow: 0 0 0 4px rgba(217, 119, 6, 0.14);
}

h1 {
  font-size: clamp(1.8rem, 3.5vw, 2.55rem);
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

h2 {
  font-size: 1.35rem;
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}

h3 {
  font-size: 1.05rem;
  margin-bottom: 8px;
}

.lead {
  font-size: 1.04rem;
  color: var(--muted);
  max-width: 860px;
  margin-bottom: 20px;
}

.lead strong { color: var(--text); font-weight: 650; }

.muted { color: var(--muted); }
.small { font-size: 0.9rem; }

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 8px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 18px;
  border-radius: 12px;
  font-weight: 650;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  font-size: 0.95rem;
  background: #fff;
  color: var(--text);
}

.btn:hover { text-decoration: none; }

.btn-primary {
  background: linear-gradient(135deg, var(--accent), #3b82f6);
  color: #fff;
  box-shadow: 0 8px 18px rgba(37, 99, 235, 0.22);
}

.btn-secondary {
  border-color: var(--border);
  background: #fff;
}

.btn-soft {
  background: var(--soft);
  color: var(--accent);
}

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

/* Grid cards */
.grid {
  display: grid;
  gap: 16px;
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.stack { display: grid; gap: 22px; }

.card {
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 20px;
  background: #fafbff;
  transition: transform .15s ease, box-shadow .15s ease;
}

a.card {
  color: inherit;
  text-decoration: none;
  display: block;
}

a.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
  text-decoration: none;
}

.card p { color: var(--muted); font-size: 0.94rem; }

.tag {
  display: inline-block;
  font-size: 0.74rem;
  font-weight: 750;
  color: var(--accent);
  background: var(--soft);
  padding: 4px 8px;
  border-radius: 999px;
  margin-bottom: 10px;
}

.tag.cyan { color: #0e7490; background: var(--soft-2); }
.tag.green { color: #15803d; background: #ecfdf5; }
.tag.orange { color: #c2410c; background: #fff7ed; }
.tag.purple { color: #7e22ce; background: #faf5ff; }

/* Docs table */
.meta-table {
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
}

.meta-row {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 12px;
  padding: 13px 16px;
  border-bottom: 1px solid var(--border);
  font-size: 0.95rem;
}

.meta-row:last-child { border-bottom: none; }
.meta-row:nth-child(odd) { background: #fafbff; }
.meta-row dt { font-weight: 700; }
.meta-row dd { color: var(--muted); }

/* Code */
.code-block {
  background: var(--code-bg);
  color: var(--code-text);
  border-radius: 14px;
  padding: 14px 16px;
  overflow-x: auto;
  font-size: 0.86rem;
  line-height: 1.65;
  margin: 12px 0;
}

.code-block .comment { color: #94a3b8; }
.code-block .key { color: #7dd3fc; }
.code-block .str { color: #86efac; }
.code-block .num { color: #fcd34d; }

.inline-code {
  background: #eef2ff;
  color: #3730a3;
  padding: 2px 7px;
  border-radius: 6px;
  font-size: 0.88em;
}

/* Forms / demo */
.demo-box {
  border: 1px dashed #bfdbfe;
  background: linear-gradient(180deg, #f8fbff, #ffffff);
  border-radius: 16px;
  padding: 18px;
  margin-top: 14px;
}

.form-row {
  display: grid;
  gap: 8px;
  margin-bottom: 12px;
}

.form-row label {
  font-size: 0.9rem;
  font-weight: 650;
}

.form-row input,
.form-row select,
.form-row textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 11px 12px;
  font: inherit;
  color: var(--text);
  background: #fff;
  outline: none;
}

.form-row input:focus,
.form-row select:focus,
.form-row textarea:focus {
  border-color: #93c5fd;
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.12);
}

.form-row textarea { min-height: 100px; resize: vertical; }

.form-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 4px;
}

.result-box {
  margin-top: 14px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: #fff;
  padding: 14px;
  min-height: 56px;
  color: var(--muted);
  word-break: break-all;
}

.result-box img {
  margin: 8px auto;
  max-width: 220px;
  border-radius: 8px;
  border: 1px solid var(--border);
}

/* Breadcrumb */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 16px;
}

.breadcrumb a { color: var(--muted); }
.breadcrumb span { opacity: 0.5; }

/* Notes list */
.note-list {
  list-style: none;
  display: grid;
  gap: 10px;
}

.note-list li {
  padding: 14px 16px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: #fafbff;
  color: var(--muted);
}

.note-list strong { color: var(--text); }

/* Timeline / article */
.article h2 { margin-top: 8px; }
.article p { color: var(--muted); margin-bottom: 12px; }
.article ul, .article ol {
  color: var(--muted);
  margin: 0 0 14px 1.2em;
}
.article li { margin: 6px 0; }

.callout {
  border-left: 4px solid var(--accent);
  background: var(--soft);
  border-radius: 0 12px 12px 0;
  padding: 12px 14px;
  color: var(--muted);
  margin: 14px 0;
}

.callout strong { color: var(--text); }

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.84);
  backdrop-filter: blur(8px);
  padding: 28px 0 30px;
  color: var(--muted);
  font-size: 0.9rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 24px;
  margin-bottom: 22px;
}

.footer-grid h4 {
  color: var(--text);
  margin-bottom: 10px;
  font-size: 0.95rem;
}

.footer-grid a {
  display: block;
  color: var(--muted);
  margin: 6px 0;
  text-decoration: none;
}

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

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 16px;
  text-align: center;
}

.footer-bottom p { margin: 4px 0; }
.footer-bottom .icp a { color: var(--muted); }
.footer-bottom .icp a:hover { color: var(--accent); }

/* Stats */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-top: 22px;
}

.stat {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px;
  background: #fff;
  text-align: center;
}

.stat .num {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1.2;
}

.stat .label {
  color: var(--muted);
  font-size: 0.85rem;
  margin-top: 4px;
}

/* Method badge */
.method {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 3px 8px;
  border-radius: 6px;
  color: #fff;
  background: #16a34a;
  vertical-align: middle;
  margin-right: 8px;
}

.method.post { background: #2563eb; }

/* Responsive */
@media (max-width: 900px) {
  .grid-2, .grid-3, .grid-4, .stats, .footer-grid {
    grid-template-columns: 1fr;
  }

  .hero, .panel { padding: 26px 18px; }

  .menu-toggle { display: inline-flex; }

  .nav-links {
    display: none;
    position: absolute;
    left: 20px;
    right: 20px;
    top: 68px;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 14px;
    box-shadow: var(--shadow);
    padding: 8px;
    flex-direction: column;
    align-items: stretch;
  }

  .nav-links.open { display: flex; }

  .nav { position: relative; }

  .meta-row { grid-template-columns: 1fr; gap: 4px; }
}