/* MergePilot — 开发者基础设施暗色主题
   色彩：深青 accent + near-black 底 + 精致边框
   字体：Inter 正文 + JetBrains Mono 代码
   动效：subtle，prefers-reduced-motion 关闭 */
:root {
  --bg: #0a0f14;
  --bg-sub: #0d1420;
  --surface: #111b27;
  --surface-2: #16212e;
  --card: #132029;
  --card-hover: #182530;
  --border: #1a2e3d;
  --border-light: #233a4a;
  --text: #e2e8f0;
  --text-2: #94a3b8;
  --text-3: #8b9cb0;
  --accent: #2dd4bf;
  --accent-dim: #14b8a6;
  --accent-deep: #0d9488;
  --accent-bg: rgba(45, 212, 191, .08);
  --accent-border: rgba(45, 212, 191, .25);
  --accent-text: #5eead4;
  --success: #34d399;
  --warning: #fbbf24;
  --error: #f87171;
  --info: #60a5fa;
  --code-bg: #0c1218;
  --code-border: #1a2630;
  --mono: "JetBrains Mono", "Fira Code", ui-monospace, Consolas, monospace;
  --sans: Inter, -apple-system, "Segoe UI", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --radius: 8px;
  --radius-sm: 5px;
  --max-w: 1080px;
}
* { box-sizing: border-box; margin: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}
body {
  font-family: var(--sans); color: var(--text); background: var(--bg);
  line-height: 1.75; -webkit-font-smoothing: antialiased;
  min-height: 100vh; display: flex; flex-direction: column;
}
main { flex: 1; }
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-text); }
a:focus-visible, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
h1, h2, h3, h4 { font-weight: 650; letter-spacing: -0.02em; line-height: 1.25; }
h1 { font-size: clamp(1.8rem, 4.5vw, 3rem); }
h2 { font-size: 1.45rem; }
h3 { font-size: 1.1rem; }
code, pre { font-family: var(--mono); font-size: .88rem; }
code {
  background: var(--surface-2); color: var(--accent-text);
  padding: .15em .45em; border-radius: 4px; border: 1px solid var(--border);
}
pre {
  background: var(--code-bg); border: 1px solid var(--code-border);
  border-radius: var(--radius); padding: 18px 22px; overflow-x: auto;
  line-height: 1.65; font-size: .86rem;
}
pre code { background: none; border: none; padding: 0; color: inherit; }
table { border-collapse: collapse; width: 100%; margin: 1.2em 0; font-size: .9rem; }
th, td { border: 1px solid var(--border); padding: 10px 14px; text-align: left; vertical-align: top; }
th { background: var(--surface-2); color: var(--text-2); font-weight: 600; font-size: .85rem; }
tbody tr:hover { background: var(--surface); }

/* ── nav ── */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(10, 15, 20, .85); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  display: flex; flex-wrap: wrap; align-items: center;
  padding: 0 24px; gap: 2px 18px; min-height: 52px;
}
.nav-brand {
  font-family: var(--mono); font-weight: 700; font-size: .95rem;
  color: var(--accent-text); letter-spacing: -0.02em; margin-right: 8px;
}
.nav-brand::before { content: "▸ "; color: var(--accent-dim); }
.nav-brand:hover { color: #fff; }
.nav-sec {
  font-size: .7rem; text-transform: uppercase; letter-spacing: .14em;
  color: var(--text-3); margin: 0 2px 0 8px; user-select: none; font-weight: 600;
}
.nav a:not(.nav-brand) {
  color: var(--text-2); text-decoration: none; font-size: .87rem;
  padding: 5px 10px; border-radius: var(--radius-sm);
  transition: color .12s, background .12s;
}
.nav a:not(.nav-brand):hover { color: var(--text); background: rgba(45,212,191,.08); }
.nav a[aria-current="page"] { color: var(--accent-text); background: var(--accent-bg); font-weight: 550; }
@media (max-width: 900px) {
  .nav { padding: 8px 14px; }
  .nav-sec { display: none; }
  .nav a:not(.nav-brand) { padding: 4px 6px; font-size: .84rem; }
}

/* ── hero ── */
.hero {
  position: relative; overflow: hidden;
  background: linear-gradient(170deg, #072722 0%, var(--bg) 65%);
  padding: clamp(60px, 10vw, 110px) 24px 64px;
  text-align: center;
}
.hero::before {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 48px 48px;
  opacity: .25; pointer-events: none;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, #000 40%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, #000 40%, transparent 100%);
}
.hero > * { position: relative; z-index: 1; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--mono); font-size: .78rem; color: var(--accent-text);
  background: var(--accent-bg); border: 1px solid var(--accent-border);
  border-radius: 100px; padding: 4px 16px; margin-bottom: 24px;
}
.hero-badge::before {
  content: ""; width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent); animation: pulse 2.5s infinite;
}
@keyframes pulse { 50% { opacity: .4; } }
@media (prefers-reduced-motion: reduce) { .hero-badge::before { animation: none; } }
.hero h1 {
  font-size: clamp(2rem, 5.5vw, 3.4rem); font-weight: 700;
  letter-spacing: -0.035em; line-height: 1.12; margin: 0 auto 20px; max-width: 820px;
  color: #f0fdfa;
}
.hero h1 em { font-style: normal; color: var(--accent-text); }
.hero .lead {
  font-size: 1.12rem; line-height: 1.8; color: var(--text-2);
  max-width: 680px; margin: 0 auto 36px;
}
.hero .cta { display: flex; flex-wrap: wrap; justify-content: center; gap: 14px; }
.hero .btn-ghost {
  font-family: var(--mono); font-size: .85rem; color: var(--accent-text);
  background: var(--code-bg); border: 1px solid var(--code-border);
  padding: 12px 20px; border-radius: var(--radius);
  cursor: pointer; text-align: left; min-width: 320px;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
}
.hero .btn-ghost:hover { border-color: var(--accent-border); }
.hero .btn-ghost .copy { color: var(--text-3); font-size: .78rem; }

/* ── stats strip ── */
.stats {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1px; background: var(--border); border-block: 1px solid var(--border);
  max-width: var(--max-w); margin: 0 auto;
}
.stat {
  background: var(--bg); padding: 24px 20px; text-align: center;
}
.stat .val { font-family: var(--mono); font-size: 1.6rem; font-weight: 700; color: var(--accent-text); }
.stat .lbl { font-size: .8rem; color: var(--text-3); margin-top: 4px; }

/* ── sections ── */
.section { max-width: var(--max-w); margin: 0 auto; padding: 64px 24px; }
.section-title { font-size: 1.5rem; margin-bottom: 10px; }
.section-sub { color: var(--text-2); margin-bottom: 32px; font-size: .95rem; }

/* ── cards ── */
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 18px; }
.card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 26px 28px;
  transition: border-color .15s, transform .15s;
}
.card:hover { border-color: var(--accent-border); transform: translateY(-2px); }
.card .icon {
  width: 40px; height: 40px; border-radius: var(--radius-sm);
  background: var(--accent-bg); border: 1px solid var(--accent-border);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem; margin-bottom: 16px;
}
.card h3 { margin: 0 0 8px; font-size: 1.02rem; }
.card p { margin: 0; font-size: .9rem; color: var(--text-2); line-height: 1.7; }

/* ── doc layout ── */
.doc {
  max-width: 760px; margin: 0 auto; padding: 40px 24px 72px;
}
.doc .crumbs { font-size: .82rem; color: var(--text-3); margin-bottom: 24px; font-family: var(--mono); }
.doc .crumbs a { color: var(--text-3); }
.doc .crumbs a:hover { color: var(--accent); }
.doc h1 { font-size: 1.7rem; margin: 0 0 20px; }
.doc h2 {
  font-size: 1.25rem; margin: 2.4em 0 12px; padding-bottom: 8px;
  border-bottom: 1px solid var(--border); color: var(--accent-text);
}
.doc h3 { font-size: 1.05rem; margin: 1.8em 0 8px; }
.doc p, .doc li { max-width: 72ch; }
.doc .meta-row {
  display: flex; gap: 16px; flex-wrap: wrap; margin: 20px 0;
  font-family: var(--mono); font-size: .8rem; color: var(--text-3);
}
.doc .meta-row span { display: flex; align-items: center; gap: 4px; }
.doc .meta-row .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--success); }

/* ── callouts ── */
.callout {
  border-radius: var(--radius); padding: 14px 18px; margin: 1.4em 0;
  font-size: .9rem; line-height: 1.7;
}
.callout-info { background: var(--accent-bg); border: 1px solid var(--accent-border); color: var(--accent-text); }
.callout-warn { background: rgba(251,191,36,.06); border: 1px solid rgba(251,191,36,.2); color: var(--warning); }
.callout-warn strong { color: var(--warning); }

/* ── flow diagram ── */
.flow {
  background: var(--code-bg); border: 1px solid var(--code-border);
  border-radius: var(--radius); padding: 24px; margin: 1.6em 0; overflow-x: auto;
}
.flow svg { display: block; min-width: 680px; max-width: 100%; margin: 0 auto; }

/* ── badge ── */
.badge {
  display: inline-flex; align-items: center; gap: 5px;
  font-family: var(--mono); font-size: .75rem; padding: 3px 10px;
  border-radius: 100px; border: 1px solid var(--border);
}
.badge-green { color: var(--success); border-color: rgba(52,211,153,.3); background: rgba(52,211,153,.06); }
.badge-amber { color: var(--warning); border-color: rgba(251,191,36,.3); background: rgba(251,191,36,.06); }
.badge-teal { color: var(--accent-text); border-color: var(--accent-border); background: var(--accent-bg); }

/* ── footer ── */
.footer {
  background: var(--bg-sub); border-top: 1px solid var(--border);
  color: var(--text-3); text-align: center;
  padding: 24px; font-size: .82rem; margin-top: auto;
}
.footer a { color: var(--text-2); }

/* ── responsive ── */
@media (max-width: 720px) {
  .hero { padding: 48px 18px 40px; }
  .hero h1 { font-size: 1.65rem; }
  .hero .lead { font-size: 1rem; }
  .hero .btn-ghost { min-width: 0; width: 100%; }
  .doc { padding: 24px 16px 48px; }
  .section { padding: 40px 16px; }
  table { display: block; overflow-x: auto; white-space: nowrap; }
}

/* ── rc.16.1 limitations 页新增 ── */
.doc .tag {
  display: inline-block; font-family: var(--sans); font-size: .78rem; font-weight: 600;
  padding: 2px 10px; border-radius: 100px; white-space: nowrap;
}
.tag-lim  { background: rgba(251,191,36,.12); color: #fbbf24; border: 1px solid rgba(251,191,36,.3); }
.tag-sec  { background: rgba(45,212,191,.08); color: #5eead4; border: 1px solid rgba(45,212,191,.25); }
.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.table-wrap table { min-width: 540px; }
.doc ul, .doc ol { padding-inline-start: 1.4em; }
.doc li { margin-bottom: .4em; }