@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@400;500;600;700&family=Noto+Serif+SC:wght@500;600;700&family=Plus+Jakarta+Sans:wght@500;600;700;800&display=swap');

/* 设计系统：ui-ux-pro-max · Corporate Trust + Minimal
   视觉语言：shadcn/ui New York（Card / Badge / Separator / Button） */

:root {
  --background: #f7f8f7;
  --foreground: #0c1210;
  --card: #ffffff;
  --card-foreground: #0c1210;
  --popover: #ffffff;
  --primary: #0a7c6a;
  --primary-foreground: #f4fffb;
  --secondary: #eef4f2;
  --secondary-foreground: #1a2a26;
  --muted: #eef2f0;
  --muted-foreground: #5b6b66;
  --accent: #e3f3ee;
  --accent-foreground: #0a5c4f;
  --destructive: #b42318;
  --destructive-foreground: #fff5f5;
  --border: #dce5e1;
  --input: #dce5e1;
  --ring: #0a7c6a;
  --radius: 0.9rem;
  --shadow-sm: 0 1px 2px rgba(12, 18, 16, 0.04);
  --shadow: 0 8px 30px rgba(12, 18, 16, 0.06);
  --shadow-lg: 0 24px 60px rgba(12, 18, 16, 0.1);
  --font-display: "Noto Serif SC", "Source Han Serif SC", serif;
  --font-sans: "Plus Jakarta Sans", "Noto Sans SC", "PingFang SC", sans-serif;
  --warn: #9a6700;
  --warn-bg: #fff8e8;
  --max: 1080px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--foreground);
  background:
    radial-gradient(900px 420px at 8% -8%, rgba(10, 124, 106, 0.09), transparent 55%),
    radial-gradient(700px 360px at 100% 0%, rgba(12, 18, 16, 0.04), transparent 50%),
    var(--background);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

.page {
  max-width: var(--max);
  margin: 0 auto;
  padding: 28px 22px 88px;
}

/* —— Top navigation (shadcn-like) —— */
.topbar {
  position: sticky;
  top: 14px;
  z-index: 40;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 28px;
  padding: 10px 12px 10px 16px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: color-mix(in srgb, var(--card) 86%, transparent);
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow-sm);
}

.brand-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--muted-foreground);
  letter-spacing: 0.01em;
}
.brand-chip strong {
  color: var(--foreground);
  font-weight: 700;
  font-family: var(--font-display);
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}
.nav-links a {
  padding: 7px 12px;
  border-radius: 999px;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--secondary-foreground);
  text-decoration: none;
  transition: background 180ms ease, color 180ms ease;
}
.nav-links a:hover {
  background: var(--secondary);
  text-decoration: none;
}
.nav-links a.is-active {
  background: var(--primary);
  color: var(--primary-foreground);
}

/* —— Hero —— */
.hero {
  position: relative;
  overflow: hidden;
  border-radius: calc(var(--radius) + 8px);
  padding: 44px 40px 40px;
  margin-bottom: 28px;
  color: #f7fffc;
  background:
    linear-gradient(135deg, rgba(255,255,255,0.08), transparent 40%),
    linear-gradient(155deg, #0b8f7a 0%, #075f52 48%, #0a3d36 100%);
  box-shadow: var(--shadow-lg);
  border: 1px solid rgba(255,255,255,0.08);
}
.hero::after {
  content: "";
  position: absolute;
  inset: auto -10% -40% auto;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255,255,255,0.14), transparent 68%);
  pointer-events: none;
}
.hero-eyebrow {
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.78);
}
.hero h1 {
  position: relative;
  z-index: 1;
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: clamp(30px, 5vw, 46px);
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.18;
}
.hero p {
  position: relative;
  z-index: 1;
  margin: 0;
  max-width: 640px;
  font-size: 15.5px;
  opacity: 0.92;
  line-height: 1.7;
}
.hero .meta {
  position: relative;
  z-index: 1;
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* —— Badge (shadcn) —— */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 26px;
  padding: 0 10px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 12px;
  font-weight: 600;
  line-height: 1;
  white-space: nowrap;
}
.badge-default {
  background: rgba(255,255,255,0.16);
  color: #fff;
  border-color: rgba(255,255,255,0.12);
}
.badge-secondary {
  background: var(--secondary);
  color: var(--secondary-foreground);
  border-color: var(--border);
}
.badge-outline {
  background: transparent;
  color: var(--foreground);
  border-color: var(--border);
}
.badge-primary {
  background: var(--accent);
  color: var(--accent-foreground);
  border-color: color-mix(in srgb, var(--primary) 18%, var(--border));
}

/* —— Card (shadcn CardHeader / Content) —— */
.card {
  background: var(--card);
  color: var(--card-foreground);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  margin-bottom: 18px;
  overflow: hidden;
  transition: box-shadow 200ms ease, transform 200ms ease, border-color 200ms ease;
}
.card:hover {
  box-shadow: var(--shadow);
  border-color: color-mix(in srgb, var(--primary) 22%, var(--border));
}
.card-header {
  padding: 22px 24px 0;
}
.card-content {
  padding: 14px 24px 22px;
}
.card-title {
  margin: 0;
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--foreground);
}
.card-description {
  margin: 8px 0 0;
  font-size: 14px;
  color: var(--muted-foreground);
}
.card h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 12px;
}
.card h2 .num,
.card-title .num {
  width: 30px;
  height: 30px;
  border-radius: 9px;
  background: var(--accent);
  color: var(--accent-foreground);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 800;
  flex-shrink: 0;
}
.card h3 {
  margin: 20px 0 8px;
  font-size: 15.5px;
  font-weight: 700;
  color: var(--accent-foreground);
}
.card p, .card li { font-size: 14.5px; color: #24302c; }
.card ul, .card ol { padding-left: 1.15em; margin: 8px 0; }
.card li { margin: 7px 0; }

.separator {
  height: 1px;
  background: var(--border);
  margin: 0 24px;
  border: 0;
}

/* —— TOC / end cards —— */
.toc {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 14px;
}
.toc a {
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-height: 148px;
  padding: 18px;
  border-radius: calc(var(--radius) - 2px);
  background: linear-gradient(180deg, #fff 0%, #f4faf8 100%);
  border: 1px solid var(--border);
  color: var(--foreground);
  text-decoration: none;
  box-shadow: var(--shadow-sm);
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}
.toc a:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
  border-color: color-mix(in srgb, var(--primary) 35%, var(--border));
  text-decoration: none;
}
.toc a .toc-kicker {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--primary);
}
.toc a strong {
  display: block;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--foreground);
}
.toc a span {
  margin-top: auto;
  font-size: 13px;
  color: var(--muted-foreground);
  line-height: 1.55;
}

/* —— Steps —— */
.steps {
  counter-reset: step;
  list-style: none;
  padding: 0;
  margin: 4px 0 0;
}
.steps > li {
  position: relative;
  padding: 16px 16px 16px 58px;
  margin: 12px 0;
  border-radius: 12px;
  background: var(--secondary);
  border: 1px solid var(--border);
}
.steps > li::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 16px;
  top: 16px;
  width: 28px;
  height: 28px;
  border-radius: 999px;
  background: var(--primary);
  color: var(--primary-foreground);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 800;
}
.steps > li strong {
  display: block;
  margin-bottom: 4px;
  font-size: 15px;
  color: var(--foreground);
}

/* —— Callouts —— */
.callout {
  border-radius: 12px;
  padding: 14px 16px;
  margin: 14px 0;
  font-size: 14px;
  border: 1px solid transparent;
}
.callout.tip {
  background: var(--accent);
  border-color: color-mix(in srgb, var(--primary) 18%, var(--border));
  color: var(--accent-foreground);
}
.callout.warn {
  background: var(--warn-bg);
  border-color: #f0d78c;
  color: #6b4a00;
}
.callout.danger {
  background: #fef3f2;
  border-color: #f3c6c2;
  color: #7a271a;
}

/* —— Table —— */
.table-wrap {
  overflow-x: auto;
  margin: 12px 0;
  border: 1px solid var(--border);
  border-radius: 12px;
}
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}
th, td {
  padding: 12px 14px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--border);
}
th {
  background: var(--secondary);
  color: var(--accent-foreground);
  font-weight: 700;
  font-size: 13px;
}
tr:last-child td { border-bottom: 0; }

.kbd {
  display: inline-block;
  padding: 1px 8px;
  border-radius: 6px;
  background: var(--muted);
  border: 1px solid var(--border);
  font-size: 12px;
  font-weight: 600;
  color: var(--muted-foreground);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 40px;
  padding: 0 16px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  border: 1px solid transparent;
  transition: 160ms ease;
}
.btn-primary {
  background: var(--primary);
  color: var(--primary-foreground);
}
.btn-primary:hover {
  filter: brightness(1.05);
  text-decoration: none;
}
.btn-outline {
  background: var(--card);
  color: var(--foreground);
  border-color: var(--border);
}
.btn-outline:hover {
  background: var(--secondary);
  text-decoration: none;
}

.footer {
  margin-top: 36px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--muted-foreground);
  font-size: 13px;
}

.flow-rail {
  display: grid;
  gap: 10px;
}
@media (min-width: 760px) {
  .flow-rail {
    grid-template-columns: repeat(5, 1fr);
  }
}
.flow-item {
  padding: 14px;
  border-radius: 12px;
  background: var(--secondary);
  border: 1px solid var(--border);
  min-height: 110px;
}
.flow-item .idx {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--primary);
  margin-bottom: 8px;
}
.flow-item strong {
  display: block;
  font-size: 14px;
  margin-bottom: 4px;
}
.flow-item p {
  margin: 0;
  font-size: 12.5px;
  color: var(--muted-foreground);
  line-height: 1.5;
}

@media (max-width: 720px) {
  .hero { padding: 28px 22px; }
  .topbar { border-radius: 18px; }
  .card-header, .card-content { padding-left: 18px; padding-right: 18px; }
}

@media print {
  body { background: #fff; }
  .topbar { position: static; backdrop-filter: none; }
  .card:hover { transform: none; box-shadow: none; }
  .hero { box-shadow: none; }
}