/* AggPay site: homepage + docs. No external fonts or CDNs. */
:root {
  --primary: #2f5bea;
  --primary-dark: #1d3fb8;
  --primary-soft: #eef2fe;
  --accent: #12b981;
  --text: #1c2333;
  --muted: #5b6478;
  --line: #e4e8f0;
  --bg: #ffffff;
  --bg-soft: #f6f8fc;
  --code-bg: #0f172a;
  --code-text: #e2e8f0;
  --radius: 12px;
  --shadow: 0 10px 30px rgba(28, 35, 51, 0.08);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 76px; }
body { margin: 0; font-family: var(--font); color: var(--text); background: var(--bg); line-height: 1.7; -webkit-font-smoothing: antialiased; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; }

.container { max-width: 1180px; margin: 0 auto; padding: 0 24px; }

/* ---------------------------------------------------------------- header */
.site-header { position: sticky; top: 0; z-index: 50; background: rgba(255, 255, 255, 0.92); backdrop-filter: saturate(180%) blur(10px); border-bottom: 1px solid var(--line); }
.site-header .container { display: flex; align-items: center; height: 64px; gap: 32px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; color: var(--text); }
.brand:hover { text-decoration: none; }
.brand-mark { width: 32px; height: 32px; border-radius: 9px; background: linear-gradient(135deg, var(--primary), #6a8cff); color: #fff; display: grid; place-items: center; font-size: 15px; font-weight: 800; letter-spacing: -0.5px; }
.brand small { font-weight: 500; color: var(--muted); font-size: 13px; }
.nav { display: flex; gap: 24px; margin-left: auto; align-items: center; }
.nav a { color: var(--muted); font-size: 15px; }
.nav a:hover, .nav a.active { color: var(--text); text-decoration: none; }
.nav .btn { color: #fff; }

/* ---------------------------------------------------------------- buttons */
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 10px 20px; border-radius: 10px; font-size: 15px; font-weight: 600; border: 1px solid transparent; transition: background .15s, box-shadow .15s, border-color .15s; }
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--primary); color: #fff; box-shadow: 0 6px 16px rgba(47, 91, 234, 0.28); }
.btn-primary:hover { background: var(--primary-dark); }
.btn-ghost { background: #fff; color: var(--text); border-color: var(--line); }
.btn-ghost:hover { border-color: #c8d0e0; }
.btn-sm { padding: 7px 14px; font-size: 14px; }

/* ---------------------------------------------------------------- hero */
.hero { position: relative; overflow: hidden; padding: 88px 0 72px; background: radial-gradient(1200px 500px at 85% -10%, #e5ecff 0%, rgba(229, 236, 255, 0) 60%), linear-gradient(180deg, #fbfcff 0%, #fff 100%); }
.hero .container { display: grid; grid-template-columns: 1.05fr 1fr; gap: 56px; align-items: center; }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; padding: 4px 12px; border-radius: 999px; background: var(--primary-soft); color: var(--primary); font-size: 13px; font-weight: 600; }
.eyebrow::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }
.hero h1 { font-size: 48px; line-height: 1.2; margin: 18px 0 18px; letter-spacing: -0.5px; }
.hero h1 em { font-style: normal; background: linear-gradient(90deg, var(--primary), #6a5cff); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero p.lead { font-size: 18px; color: var(--muted); margin: 0 0 32px; max-width: 540px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.hero-facts { display: flex; gap: 36px; margin-top: 40px; padding-top: 28px; border-top: 1px solid var(--line); }
.hero-facts strong { display: block; font-size: 28px; line-height: 1.2; }
.hero-facts span { color: var(--muted); font-size: 14px; }

/* ---------------------------------------------------------------- code window */
.code-window { background: var(--code-bg); border-radius: 14px; box-shadow: 0 24px 60px rgba(15, 23, 42, 0.28); overflow: hidden; }
.code-window .bar { display: flex; align-items: center; gap: 7px; padding: 12px 16px; background: #1e293b; }
.code-window .bar i { width: 11px; height: 11px; border-radius: 50%; background: #475569; }
.code-window .bar i:nth-child(1) { background: #f87171; }
.code-window .bar i:nth-child(2) { background: #fbbf24; }
.code-window .bar i:nth-child(3) { background: #34d399; }
.code-window .bar span { margin-left: 10px; color: #94a3b8; font-size: 13px; font-family: var(--mono); }
.code-window pre { margin: 0; padding: 20px 22px; color: var(--code-text); font: 13.5px/1.75 var(--mono); overflow-x: auto; }
.tok-k { color: #93c5fd; }
.tok-s { color: #86efac; }
.tok-n { color: #fca5a5; }
.tok-c { color: #64748b; }

/* ---------------------------------------------------------------- sections */
section.block { padding: 88px 0; }
section.block.soft { background: var(--bg-soft); }
.section-head { text-align: center; max-width: 680px; margin: 0 auto 52px; }
.section-head h2 { font-size: 34px; margin: 0 0 12px; letter-spacing: -0.3px; }
.section-head p { color: var(--muted); font-size: 17px; margin: 0; }

.grid { display: grid; gap: 24px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }

.card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; transition: box-shadow .2s, transform .2s, border-color .2s; }
.card:hover { box-shadow: var(--shadow); transform: translateY(-2px); border-color: #d6ddeb; }
.card h3 { margin: 16px 0 8px; font-size: 19px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
.icon { width: 46px; height: 46px; border-radius: 12px; display: grid; place-items: center; background: var(--primary-soft); color: var(--primary); }
.icon svg { width: 24px; height: 24px; }

/* channels */
.channel { display: flex; flex-direction: column; }
.channel-head { display: flex; align-items: center; gap: 12px; }
.channel-logo { width: 42px; height: 42px; border-radius: 11px; display: grid; place-items: center; color: #fff; font-weight: 800; font-size: 15px; }
.channel-logo.wx { background: #07c160; }
.channel-logo.ali { background: #1677ff; }
.channel-logo.xp { background: linear-gradient(135deg, #07c160, #0bb39a); }
.channel-logo.jd { background: #e1251b; }
.channel-logo.mock { background: #64748b; }
.channel h3 { margin: 0; }
.channel .tag { font-size: 12px; color: var(--muted); }
.products { list-style: none; padding: 0; margin: 18px 0 0; display: grid; gap: 8px; }
.products li { display: flex; justify-content: space-between; gap: 10px; font-size: 14px; padding: 8px 12px; background: var(--bg-soft); border-radius: 8px; }
.products code { font-family: var(--mono); font-size: 12.5px; color: var(--primary-dark); }

/* steps */
.steps { counter-reset: step; }
.step { position: relative; padding-top: 56px; }
.step::before { counter-increment: step; content: counter(step); position: absolute; top: 0; left: 0; width: 40px; height: 40px; border-radius: 50%; background: var(--primary); color: #fff; display: grid; place-items: center; font-weight: 700; box-shadow: 0 6px 16px rgba(47, 91, 234, 0.3); }
.step h3 { margin: 0 0 6px; font-size: 18px; }
.step p { margin: 0; color: var(--muted); font-size: 15px; }

/* flow diagram */
.flow { display: grid; grid-template-columns: repeat(5, 1fr); gap: 0; align-items: stretch; margin-top: 8px; }
.flow-node { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 20px 16px; text-align: center; position: relative; }
.flow-node strong { display: block; font-size: 16px; margin-bottom: 4px; }
.flow-node span { font-size: 13px; color: var(--muted); }
.flow-node.core { border-color: var(--primary); background: var(--primary-soft); }
.flow-arrow { display: grid; place-items: center; color: #9aa6bd; font-size: 13px; text-align: center; padding: 0 6px; }
.flow-arrow b { display: block; font-size: 22px; color: var(--primary); line-height: 1; }

/* docs cards */
.doc-card { display: flex; flex-direction: column; color: var(--text); }
.doc-card:hover { text-decoration: none; }
.doc-card .more { margin-top: 18px; color: var(--primary); font-weight: 600; font-size: 15px; }
.doc-card ul { margin: 14px 0 0; padding-left: 18px; color: var(--muted); font-size: 14px; }

/* cta */
.cta { background: linear-gradient(135deg, var(--primary) 0%, #5a4bff 100%); color: #fff; border-radius: 20px; padding: 56px; display: flex; align-items: center; justify-content: space-between; gap: 32px; }
.cta h2 { margin: 0 0 8px; font-size: 30px; }
.cta p { margin: 0; opacity: 0.85; }
.cta .btn-ghost { border: 0; }

/* footer */
.site-footer { border-top: 1px solid var(--line); padding: 36px 0; color: var(--muted); font-size: 14px; }
.site-footer .container { display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.site-footer nav { display: flex; gap: 20px; }
.site-footer a { color: var(--muted); }

/* ---------------------------------------------------------------- docs layout */
.docs { display: grid; grid-template-columns: 260px minmax(0, 1fr); gap: 48px; padding-top: 32px; padding-bottom: 80px; }
.docs-side { position: sticky; top: 88px; align-self: start; max-height: calc(100vh - 104px); overflow-y: auto; padding-right: 8px; font-size: 14px; }
.docs-side h4 { margin: 0 0 10px; font-size: 12px; text-transform: uppercase; letter-spacing: 0.6px; color: #8a93a6; }
.docs-side ul { list-style: none; padding: 0; margin: 0 0 28px; }
.docs-side li a { display: block; padding: 6px 12px; border-radius: 8px; color: var(--muted); line-height: 1.5; }
.docs-side li a:hover { background: var(--bg-soft); color: var(--text); text-decoration: none; }
.docs-side li a.active { background: var(--primary-soft); color: var(--primary); font-weight: 600; }
.docs-side .toc li.lv3 a { padding-left: 26px; font-size: 13px; }

.doc-meta { color: var(--muted); font-size: 13px; margin-bottom: 8px; }
.prose { font-size: 15.5px; }
.prose h1 { font-size: 34px; line-height: 1.3; margin: 0 0 20px; letter-spacing: -0.3px; }
.prose h2 { font-size: 25px; margin: 52px 0 16px; padding-top: 24px; border-top: 1px solid var(--line); }
.prose h3 { font-size: 19px; margin: 34px 0 12px; }
.prose h4 { font-size: 16px; margin: 26px 0 10px; }
.prose h2:first-of-type { border-top: 0; padding-top: 0; }
.prose .heading-permalink { margin-left: 8px; color: #b6bfd0; font-weight: 400; opacity: 0; transition: opacity .15s; }
.prose h1:hover .heading-permalink, .prose h2:hover .heading-permalink, .prose h3:hover .heading-permalink, .prose h4:hover .heading-permalink { opacity: 1; }
.prose p, .prose ul, .prose ol { margin: 0 0 16px; }
.prose li { margin: 4px 0; }
.prose li > p { margin: 0; }
.prose hr { border: 0; border-top: 1px solid var(--line); margin: 40px 0; }
.prose blockquote { margin: 20px 0; padding: 12px 18px; background: #fff8e6; border-left: 4px solid #f5b400; border-radius: 0 8px 8px 0; color: #5c4a10; }
.prose blockquote p:last-child { margin-bottom: 0; }
.prose code { font-family: var(--mono); font-size: 0.88em; background: #f0f3f9; color: #c0264b; padding: 2px 6px; border-radius: 5px; word-break: break-word; }
.prose pre { position: relative; background: var(--code-bg); color: var(--code-text); border-radius: 10px; padding: 18px 20px; overflow-x: auto; margin: 0 0 20px; font: 13.5px/1.7 var(--mono); }
.prose pre code { background: transparent; color: inherit; padding: 0; font-size: inherit; word-break: normal; }
.copy-btn { position: absolute; top: 10px; right: 10px; padding: 3px 10px; font-size: 12px; border-radius: 6px; border: 1px solid #334155; background: #1e293b; color: #cbd5e1; cursor: pointer; opacity: 0; transition: opacity .15s; font-family: var(--font); }
.prose pre:hover .copy-btn { opacity: 1; }
.table-wrap { overflow-x: auto; margin: 0 0 20px; border: 1px solid var(--line); border-radius: 10px; }
.prose table { border-collapse: collapse; width: 100%; font-size: 14px; }
.prose th, .prose td { padding: 10px 14px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.prose th { background: var(--bg-soft); font-weight: 600; white-space: nowrap; }
.prose tr:last-child td { border-bottom: 0; }
.prose input[type="checkbox"] { margin-right: 6px; }
.prose ul.contains-task-list { list-style: none; padding-left: 4px; }

/* ---------------------------------------------------------------- responsive */
@media (max-width: 1024px) {
  .hero .container { grid-template-columns: 1fr; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .flow { grid-template-columns: 1fr; gap: 6px; }
  .flow-arrow { padding: 4px 0; }
  .flow-arrow b { transform: rotate(90deg); }
}
@media (max-width: 860px) {
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .docs { grid-template-columns: 1fr; gap: 16px; }
  .docs-side { position: static; max-height: none; border-bottom: 1px solid var(--line); padding-bottom: 8px; }
  .docs-side .toc-block { display: none; }
  .cta { flex-direction: column; align-items: flex-start; padding: 36px; }
}
@media (max-width: 640px) {
  .nav a:not(.btn) { display: none; }
  .hero { padding: 56px 0 48px; }
  .hero h1 { font-size: 34px; }
  .hero-facts { gap: 22px; }
  .grid-4 { grid-template-columns: 1fr; }
  section.block { padding: 60px 0; }
  .section-head h2 { font-size: 27px; }
}