/* ========== 主题变量 ========== */
:root {
  --bg: #f6f3ec;
  --surface: #fffdf8;
  --ink: #1d1f24;
  --muted: #6b6f78;
  --line: #e3ddd0;
  --accent: #d9480f;
  --accent-ink: #ffffff;
  --accent-soft: #fde8dc;
  --code-bg: #1e2128;
  --code-ink: #e8e6e1;
  --tip: #2b8a3e; --tip-bg: #e6f4ea;
  --note: #1c6dd0; --note-bg: #e5effb;
  --warn: #b35c00; --warn-bg: #fff1dc;
  --danger: #c92a2a; --danger-bg: #fde4e4;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(0,0,0,.04), 0 6px 24px rgba(30,25,10,.06);
  --font: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "Cascadia Code", "JetBrains Mono", Consolas, "SF Mono", monospace;
  --topbar: 60px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #16181d; --surface: #1e2128; --ink: #ecebe7; --muted: #9aa0aa; --line: #2e323b;
    --accent: #ff7a3d; --accent-ink: #16181d; --accent-soft: #3a2418; --code-bg: #0f1115;
    --tip-bg: #16301f; --note-bg: #142338; --warn-bg: #33250f; --danger-bg: #3a1a1a;
    --tip: #69db7c; --note: #74c0fc; --warn: #ffc078; --danger: #ff8787;
    --shadow: 0 1px 2px rgba(0,0,0,.3), 0 6px 24px rgba(0,0,0,.25);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #16181d; --surface: #1e2128; --ink: #ecebe7; --muted: #9aa0aa; --line: #2e323b;
  --accent: #ff7a3d; --accent-ink: #16181d; --accent-soft: #3a2418; --code-bg: #0f1115;
  --tip-bg: #16301f; --note-bg: #142338; --warn-bg: #33250f; --danger-bg: #3a1a1a;
  --tip: #69db7c; --note: #74c0fc; --warn: #ffc078; --danger: #ff8787;
  --shadow: 0 1px 2px rgba(0,0,0,.3), 0 6px 24px rgba(0,0,0,.25);
  color-scheme: dark;
}

/* ========== 基础 ========== */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--topbar) + 16px); -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } * { transition: none !important; animation: none !important; } }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.75 var(--font); }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-underline-offset: 3px; }
h1, h2, h3, h4 { line-height: 1.3; margin: 0 0 .6em; letter-spacing: -.01em; }
code { font-family: var(--mono); font-size: .9em; background: var(--accent-soft); padding: .1em .35em; border-radius: 5px; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; border-radius: 6px; }
.muted { color: var(--muted); }
.skip { position: absolute; left: -999px; top: 8px; background: var(--ink); color: var(--bg); padding: 8px 14px; border-radius: 8px; z-index: 100; }
.skip:focus { left: 8px; }

/* ========== 顶栏 ========== */
.topbar {
  position: sticky; top: 0; z-index: 20; height: var(--topbar);
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 0 clamp(16px, 4vw, 40px);
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(10px); border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; color: var(--ink); text-decoration: none; }
.brand-mark { display: grid; place-items: center; width: 32px; height: 32px; border-radius: 9px; background: var(--accent); color: var(--accent-ink); font-size: 17px; }
.topbar nav { display: flex; align-items: center; gap: 8px; }
.topbar nav a { color: var(--ink); text-decoration: none; padding: 6px 12px; border-radius: 999px; font-size: 15px; }
.topbar nav a:hover { background: var(--surface); }
.theme-toggle { border: 1px solid var(--line); background: var(--surface); color: var(--ink); width: 36px; height: 36px; border-radius: 50%; cursor: pointer; font-size: 16px; }

main { max-width: 1180px; margin: 0 auto; padding: 0 clamp(16px, 4vw, 40px); }

/* ========== 按钮 ========== */
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 12px 22px; border-radius: 999px; border: 1px solid var(--line); background: var(--surface); color: var(--ink); text-decoration: none; font-weight: 600; transition: transform .15s, box-shadow .15s; }
.btn:hover { transform: translateY(-1px); box-shadow: var(--shadow); }
.btn-primary { background: var(--ink); color: var(--bg); border-color: var(--ink); }

/* ========== 首页 ========== */
.hero { padding: clamp(48px, 10vw, 110px) 0 clamp(40px, 7vw, 80px); max-width: 820px; }
.hero.narrow { text-align: left; min-height: 60vh; }
.eyebrow { font-size: 13px; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; color: var(--accent); margin: 0 0 14px; }
.hero h1 { font-size: clamp(34px, 6.5vw, 64px); font-weight: 800; margin-bottom: 20px; }
.lead { font-size: clamp(17px, 2vw, 20px); color: var(--muted); max-width: 640px; margin: 0 0 28px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.hero-steps { display: flex; flex-wrap: wrap; gap: 10px; list-style: none; padding: 0; margin: 44px 0 0; }
.hero-steps li { display: flex; align-items: center; gap: 10px; padding: 10px 16px 10px 10px; background: var(--surface); border: 1px solid var(--line); border-radius: 999px; font-size: 15px; }
.hero-steps span { display: grid; place-items: center; width: 30px; height: 30px; border-radius: 50%; background: var(--accent-soft); color: var(--accent); font: 700 12px var(--mono); }

.section-head { display: flex; flex-wrap: wrap; align-items: end; justify-content: space-between; gap: 16px; margin-bottom: 24px; }
.section-head h2 { font-size: clamp(26px, 3.5vw, 36px); margin: 0; }
.filters { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.search { font: inherit; padding: 9px 16px; border-radius: 999px; border: 1px solid var(--line); background: var(--surface); color: var(--ink); min-width: 220px; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip { font: inherit; font-size: 14px; padding: 7px 14px; border-radius: 999px; border: 1px solid var(--line); background: transparent; color: var(--ink); cursor: pointer; }
.chip.is-on { background: var(--ink); color: var(--bg); border-color: var(--ink); }

.cards { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 18px; }
.card a { position: relative; display: flex; flex-direction: column; height: 100%; padding: 24px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); color: var(--ink); text-decoration: none; transition: transform .2s, box-shadow .2s, border-color .2s; }
.card a:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: color-mix(in srgb, var(--accent) 40%, var(--line)); }
.card-meta { display: flex; justify-content: space-between; gap: 8px; font-size: 13px; color: var(--muted); margin-bottom: 14px; }
.pill { background: var(--accent-soft); color: var(--accent); padding: 2px 10px; border-radius: 999px; font-weight: 600; }
.card h3 { font-size: 20px; margin-bottom: 8px; }
.card p { color: var(--muted); font-size: 15px; margin: 0 0 18px; flex: 1; }
.card-progress:not(:empty) { font-size: 13px; color: var(--tip); font-weight: 600; margin-bottom: 8px; }
.card-go { font-weight: 700; font-size: 14px; color: var(--accent); }
.empty { color: var(--muted); padding: 40px 0; text-align: center; }

.how { margin: clamp(60px, 10vw, 110px) 0; }
.how h2 { font-size: clamp(26px, 3.5vw, 36px); }
.how-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 18px; margin-top: 24px; }
.how-grid > div { padding: 24px; border-radius: var(--radius); background: var(--surface); border: 1px solid var(--line); }
.how-n { display: grid; place-items: center; width: 36px; height: 36px; border-radius: 10px; background: var(--ink); color: var(--bg); font: 700 15px var(--mono); margin-bottom: 14px; }
.how h3 { font-size: 18px; margin-bottom: 6px; }
.how p { color: var(--muted); margin: 0; font-size: 15px; }

/* ========== 教程页 ========== */
.crumbs { display: flex; flex-wrap: wrap; gap: 8px; font-size: 14px; color: var(--muted); padding-top: 24px; }
.crumbs a { color: var(--muted); }
.guide-head { padding: 28px 0 36px; border-bottom: 1px solid var(--line); max-width: 820px; }
.guide-head h1 { font-size: clamp(30px, 5vw, 48px); font-weight: 800; }
.guide-facts { display: flex; flex-wrap: wrap; gap: 8px 20px; list-style: none; padding: 0; margin: 0; font-size: 15px; color: var(--muted); }
.guide-facts strong { color: var(--ink); }
.intro { margin-top: 24px; }

.guide-body { display: grid; grid-template-columns: 250px minmax(0, 1fr); gap: clamp(24px, 5vw, 64px); padding: 36px 0 80px; }
.toc { position: sticky; top: calc(var(--topbar) + 24px); align-self: start; max-height: calc(100vh - var(--topbar) - 48px); overflow: auto; }
.toc-title { display: flex; justify-content: space-between; font-size: 13px; font-weight: 700; letter-spacing: .08em; color: var(--muted); margin: 0 0 10px; }
.toc-bar { height: 4px; background: var(--line); border-radius: 4px; overflow: hidden; margin-bottom: 14px; }
.toc-bar span { display: block; height: 100%; width: 0; background: var(--tip); transition: width .3s; }
.toc ol { list-style: none; padding: 0; margin: 0; border-left: 2px solid var(--line); }
.toc a { display: flex; gap: 10px; padding: 8px 12px; margin-left: -2px; border-left: 2px solid transparent; color: var(--muted); text-decoration: none; font-size: 15px; line-height: 1.45; }
.toc a:hover { color: var(--ink); }
.toc a .n { font: 600 12px/1.9 var(--mono); }
.toc a.is-active { color: var(--ink); border-left-color: var(--accent); font-weight: 600; }
.toc a.is-active .n { color: var(--accent); }
.toc a.is-done .n::after { content: " ✓"; color: var(--tip); }

.step { padding: 8px 0 48px; margin-bottom: 40px; border-bottom: 1px dashed var(--line); max-width: 780px; }
.step:last-of-type { border-bottom: 0; }
.step-num { font: 700 12px var(--mono); letter-spacing: .1em; color: var(--accent); margin: 0 0 8px; }
.step h2 { font-size: clamp(24px, 3vw, 30px); }
.prose > * + * { margin-top: 1em; }
.prose p { margin-bottom: 0; }
.prose > p:first-child { margin-top: 0; }
.prose h3 { font-size: 19px; margin-top: 1.8em; }
.prose h4 { font-size: 17px; margin-top: 1.4em; }
.prose ul, .prose ol { padding-left: 1.4em; margin-bottom: 0; }
.prose li + li { margin-top: .35em; }
.prose blockquote { margin: 0; padding: 4px 18px; border-left: 3px solid var(--line); color: var(--muted); }
.ext { font-size: .8em; margin-left: 2px; }

.callout { padding: 16px 18px; border-radius: 12px; border-left: 4px solid; font-size: 15px; }
.callout > strong { display: block; margin-bottom: 4px; }
.callout > *:not(strong) { margin: 0; }
.callout > * + * { margin-top: .5em; }
.callout-tip { background: var(--tip-bg); border-color: var(--tip); } .callout-tip > strong { color: var(--tip); }
.callout-note { background: var(--note-bg); border-color: var(--note); } .callout-note > strong { color: var(--note); }
.callout-warning { background: var(--warn-bg); border-color: var(--warn); } .callout-warning > strong { color: var(--warn); }
.callout-danger { background: var(--danger-bg); border-color: var(--danger); } .callout-danger > strong { color: var(--danger); }

.code { margin: 1.2em 0 0; border-radius: 12px; overflow: hidden; background: var(--code-bg); }
.code figcaption { display: flex; justify-content: space-between; align-items: center; padding: 8px 10px 8px 16px; font: 700 11px var(--mono); letter-spacing: .1em; color: #9aa0aa; border-bottom: 1px solid rgba(255,255,255,.08); }
.copy { font: 600 12px var(--font); padding: 5px 12px; border-radius: 7px; border: 1px solid rgba(255,255,255,.15); background: rgba(255,255,255,.06); color: var(--code-ink); cursor: pointer; }
.copy:hover { background: rgba(255,255,255,.14); }
.copy.is-copied { background: var(--tip); border-color: var(--tip); color: #fff; }
.code pre { margin: 0; padding: 16px; overflow-x: auto; }
.code code { background: none; padding: 0; color: var(--code-ink); font-size: 14px; line-height: 1.65; white-space: pre; }

.shot { margin: 1.4em 0 0; }
.zoom { display: block; width: 100%; padding: 0; border: 1px solid var(--line); border-radius: 12px; overflow: hidden; background: var(--surface); cursor: zoom-in; }
.zoom img { width: 100%; }
.shot figcaption { font-size: 14px; color: var(--muted); margin-top: 8px; text-align: center; }

.done { display: inline-flex; align-items: center; gap: 10px; margin-top: 28px; padding: 10px 16px; border-radius: 10px; border: 1px solid var(--line); background: var(--surface); cursor: pointer; font-size: 15px; user-select: none; }
.done input { width: 18px; height: 18px; accent-color: var(--tip); }
.done:has(input:checked) { border-color: var(--tip); background: var(--tip-bg); color: var(--tip); font-weight: 600; }

.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 24px; max-width: 780px; }
.pager a { display: block; padding: 18px 20px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); color: var(--ink); text-decoration: none; font-weight: 600; }
.pager a:hover { border-color: var(--accent); }
.pager small { display: block; color: var(--muted); font-weight: 400; font-size: 13px; }
.pager .next { text-align: right; }

/* ========== 放大镜 ========== */
.lightbox { position: fixed; inset: 0; z-index: 50; display: grid; place-items: center; padding: 24px; background: rgba(10,10,12,.88); cursor: zoom-out; }
.lightbox[hidden] { display: none; }
.lightbox img { max-width: min(1400px, 100%); max-height: 100%; border-radius: 8px; box-shadow: 0 10px 60px rgba(0,0,0,.5); }
.lb-close { position: absolute; top: 14px; right: 16px; width: 44px; height: 44px; border-radius: 50%; border: 0; background: rgba(255,255,255,.12); color: #fff; font-size: 26px; cursor: pointer; }

/* ========== 页脚 ========== */
.footer { border-top: 1px solid var(--line); padding: 28px clamp(16px, 4vw, 40px); text-align: center; font-size: 14px; }
.footer p { margin: 4px 0; }

/* ========== 手机 ========== */
@media (max-width: 860px) {
  .guide-body { grid-template-columns: minmax(0, 1fr); padding-top: 0; }
  .toc {
    top: var(--topbar); z-index: 10; max-height: none; overflow: visible;
    margin: 0 calc(-1 * clamp(16px, 4vw, 40px)); padding: 10px clamp(16px, 4vw, 40px) 0;
    background: color-mix(in srgb, var(--bg) 92%, transparent); backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--line);
  }
  .toc-title { display: none; }
  .toc-bar { margin-bottom: 0; order: 2; }
  .toc ol { display: flex; gap: 6px; overflow-x: auto; border-left: 0; padding: 0 0 10px; scrollbar-width: none; }
  .toc ol::-webkit-scrollbar { display: none; }
  .toc a { margin: 0; border: 1px solid var(--line); border-radius: 999px; padding: 4px 12px; white-space: nowrap; }
  .toc a .t { display: none; }
  .toc a.is-active { background: var(--ink); color: var(--bg); border-color: var(--ink); }
  .toc a.is-active .n { color: var(--bg); }
  .step { padding-top: 24px; }
  .pager { grid-template-columns: 1fr; }
  .pager .next { text-align: left; }
  .search { min-width: 0; width: 100%; }
  .filters { width: 100%; }
}