:root {
  --bg: #f7f8f6;
  --surface: #ffffff;
  --surface-2: #eef1ee;
  --text: #1b2421;
  --muted: #5b6763;
  --border: #dde2de;
  --accent: #0f6b5c;
  --accent-ink: #ffffff;
  --accent-soft: #e2f0ec;
  --warn-soft: #fbf0d9;
  --warn-ink: #7a5300;
  --code-bg: #f1f3f1;
  --shadow: 0 1px 2px rgba(20, 30, 25, 0.06), 0 4px 16px rgba(20, 30, 25, 0.05);
  --radius: 12px;
  --maxw: 1080px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", Roboto, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #111614;
    --surface: #182019;
    --surface-2: #1f2925;
    --text: #e6ece9;
    --muted: #9aa7a2;
    --border: #2c3833;
    --accent: #4fc3a9;
    --accent-ink: #0c1512;
    --accent-soft: #1d332d;
    --warn-soft: #3a2f17;
    --warn-ink: #f0c56b;
    --code-bg: #1c2521;
    --shadow: none;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #111614; --surface: #182019; --surface-2: #1f2925; --text: #e6ece9; --muted: #9aa7a2;
  --border: #2c3833; --accent: #4fc3a9; --accent-ink: #0c1512; --accent-soft: #1d332d;
  --warn-soft: #3a2f17; --warn-ink: #f0c56b; --code-bg: #1c2521; --shadow: none; color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.7 var(--font);
  overflow-x: hidden;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 16px; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(8px);
  border-bottom: 1px solid var(--border);
}
.site-header .wrap { display: flex; align-items: center; gap: 16px; height: 60px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); font-weight: 700; letter-spacing: -0.01em; }
.brand:hover { text-decoration: none; }
.brand-mark {
  width: 30px; height: 30px; border-radius: 8px; display: grid; place-items: center;
  background: var(--accent); color: var(--accent-ink); font-size: 13px; font-weight: 800;
}
.brand small { display: block; font-weight: 500; color: var(--muted); font-size: 12px; line-height: 1.2; }
.nav { display: flex; gap: 4px; margin-left: auto; }
.nav a { color: var(--muted); padding: 6px 10px; border-radius: 8px; font-size: 15px; }
.nav a:hover { color: var(--text); background: var(--surface-2); text-decoration: none; }
.nav a[aria-current="page"] { color: var(--text); background: var(--surface-2); font-weight: 600; }
.lang {
  border: 1px solid var(--border); border-radius: 999px; padding: 4px 12px; font-size: 14px;
  color: var(--text); white-space: nowrap;
}
.lang:hover { border-color: var(--accent); text-decoration: none; }
.menu { display: none; margin-left: auto; }
.menu summary {
  list-style: none; cursor: pointer; padding: 6px 10px; border: 1px solid var(--border);
  border-radius: 8px; font-size: 14px;
}
.menu summary::-webkit-details-marker { display: none; }
.menu[open] .menu-panel {
  position: absolute; left: 0; right: 0; top: 60px; background: var(--surface);
  border-bottom: 1px solid var(--border); padding: 8px 16px 16px; display: grid; gap: 2px;
}
.menu-panel a { padding: 10px 4px; color: var(--text); border-bottom: 1px solid var(--border); }

@media (max-width: 760px) {
  .nav { display: none; }
  .menu { display: block; }
  .lang { margin-left: 0; }
}

/* Hero */
.hero { padding: 64px 0 40px; }
.eyebrow { color: var(--accent); font-weight: 600; font-size: 14px; letter-spacing: 0.02em; }
.hero h1 { font-size: clamp(28px, 5vw, 44px); line-height: 1.2; margin: 8px 0 16px; letter-spacing: -0.02em; max-width: 18em; }
.hero p { color: var(--muted); font-size: 18px; max-width: 36em; margin: 0 0 24px; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; }
.btn {
  display: inline-block; padding: 10px 18px; border-radius: 10px; font-weight: 600;
  background: var(--accent); color: var(--accent-ink); border: 1px solid var(--accent);
}
.btn:hover { text-decoration: none; filter: brightness(1.05); }
.btn.ghost { background: transparent; color: var(--text); border-color: var(--border); }

/* Sections and cards */
section { padding: 24px 0; }
h2.section-title { font-size: 22px; margin: 0 0 16px; letter-spacing: -0.01em; }
.grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px; box-shadow: var(--shadow); color: var(--text); display: block;
}
a.card:hover { border-color: var(--accent); text-decoration: none; }
.card h3 { margin: 0 0 6px; font-size: 17px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
.badge {
  display: inline-block; font-size: 12px; font-weight: 600; padding: 2px 8px; border-radius: 999px;
  background: var(--accent-soft); color: var(--accent);
}
.badge.warn { background: var(--warn-soft); color: var(--warn-ink); }

/* Phase strip */
.phases { display: grid; grid-template-columns: repeat(6, 1fr); gap: 8px; counter-reset: phase; }
.phase {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 14px; color: var(--text); counter-increment: phase;
}
.phase:hover { border-color: var(--accent); text-decoration: none; }
.phase::before { content: counter(phase); font-size: 12px; font-weight: 700; color: var(--accent); }
.phase strong { display: block; font-size: 16px; }
.phase span { display: block; color: var(--muted); font-size: 13px; line-height: 1.5; margin-top: 4px; }
@media (max-width: 900px) { .phases { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 520px) { .phases { grid-template-columns: repeat(2, 1fr); } }

/* Page header */
.page-head { padding: 40px 0 8px; }
.page-head h1 { font-size: clamp(26px, 4vw, 36px); line-height: 1.25; margin: 0 0 8px; letter-spacing: -0.02em; }
.page-head p { color: var(--muted); margin: 0; max-width: 40em; }
.crumbs { font-size: 14px; color: var(--muted); margin-bottom: 8px; }

/* Tasks */
.task { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px 20px; margin-bottom: 12px; }
.task h3 { margin: 0 0 4px; font-size: 17px; }
.task p { margin: 0 0 8px; color: var(--muted); }
.task .links { display: flex; flex-wrap: wrap; gap: 8px; font-size: 14px; }
.task .links a { background: var(--accent-soft); padding: 2px 10px; border-radius: 999px; }
.phase-nav { display: flex; justify-content: space-between; gap: 12px; margin: 24px 0; flex-wrap: wrap; }

/* Article list */
.list { display: grid; gap: 12px; }
.list .card .meta { margin-top: 10px; display: flex; gap: 8px; flex-wrap: wrap; }

/* Article */
.article-layout { display: grid; grid-template-columns: minmax(0, 1fr) 220px; gap: 40px; padding-bottom: 48px; }
.toc { position: sticky; top: 80px; align-self: start; font-size: 14px; }
.toc strong { display: block; margin-bottom: 8px; color: var(--muted); font-size: 13px; }
.toc a { display: block; color: var(--muted); padding: 3px 0; line-height: 1.4; }
.toc a:hover { color: var(--accent); }
@media (max-width: 900px) { .article-layout { grid-template-columns: minmax(0, 1fr); } .toc { display: none; } }
.article-meta { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; color: var(--muted); font-size: 14px; margin-top: 12px; }
.prose { max-width: 46em; }
.prose h1 { display: none; }
.prose h2 { font-size: 24px; margin: 40px 0 12px; padding-top: 8px; letter-spacing: -0.01em; scroll-margin-top: 80px; }
.prose h3 { font-size: 19px; margin: 28px 0 8px; scroll-margin-top: 80px; }
.prose h4 { font-size: 16px; margin: 20px 0 6px; }
.prose p, .prose li { color: var(--text); }
.prose blockquote {
  margin: 16px 0; padding: 12px 16px; border-left: 3px solid var(--accent);
  background: var(--accent-soft); border-radius: 0 8px 8px 0;
}
.prose blockquote p { margin: 0; }
.prose hr { border: 0; border-top: 1px solid var(--border); margin: 32px 0; }
.prose code { font-family: var(--mono); font-size: 0.9em; background: var(--code-bg); padding: 1px 5px; border-radius: 4px; }
.prose pre {
  background: var(--code-bg); border: 1px solid var(--border); border-radius: 8px;
  padding: 14px 16px; overflow-x: auto; font-size: 13.5px; line-height: 1.55;
}
.prose pre code { background: none; padding: 0; }
.table-scroll { overflow-x: auto; margin: 16px 0; }
.prose table { border-collapse: collapse; width: 100%; font-size: 15px; min-width: 480px; }
.prose th, .prose td { border: 1px solid var(--border); padding: 8px 10px; text-align: left; vertical-align: top; }
.prose th { background: var(--surface-2); font-weight: 600; }
.prose ul:has(input[type="checkbox"]) { list-style: none; padding-left: 4px; }
.prose input[type="checkbox"] { margin-right: 8px; accent-color: var(--accent); }

/* Resources */
.resource { display: grid; gap: 4px; }
.resource .url { font-size: 13px; color: var(--muted); word-break: break-all; }

/* Footer */
.site-footer { border-top: 1px solid var(--border); margin-top: 48px; padding: 24px 0 40px; color: var(--muted); font-size: 14px; }
.site-footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; }