/* ============================================================
   3D建模 / 3D打印 学航图 —— 主题化设计
   视觉关键词: 蓝图纸(blueprint grid) · 耗材橙(filament) · 层积纹(layer lines) · 线框(wireframe)
   ============================================================ */

:root {
  --bg: #f5f7fa;
  --surface: #ffffff;
  --surface-2: #eef1f6;
  --ink: #1b2432;
  --muted: #5b6678;
  --line: #dfe5ee;
  --primary: #f97316;
  --primary-deep: #c2540a;
  --primary-soft: rgba(249, 115, 22, 0.10);
  --accent: #06b6d4;
  --code-bg: #101828;
  --code-ink: #dbe4f3;
  --radius: 14px;
  --radius-sm: 9px;
  --shadow: 0 1px 2px rgba(16, 24, 40, .05), 0 8px 28px -12px rgba(16, 24, 40, .18);
  --font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
}

html[data-theme="dark"] {
  --bg: #0c1017;
  --surface: #131a25;
  --surface-2: #1a2230;
  --ink: #e7ecf5;
  --muted: #97a3b8;
  --line: #232f42;
  --primary: #fb923c;
  --primary-deep: #fdba74;
  --primary-soft: rgba(251, 146, 60, 0.12);
  --accent: #22d3ee;
  --code-bg: #0a0f18;
  --code-ink: #cdd8ea;
  --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 10px 32px -14px rgba(0, 0, 0, .6);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--primary-deep); text-decoration: none; }
a:hover { text-decoration: underline; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }

.skip {
  position: absolute; left: -999px; top: 8px; z-index: 99;
  background: var(--surface); padding: 8px 14px; border-radius: 8px;
}
.skip:focus { left: 8px; }

/* ---------------- 顶栏 ---------------- */
.topbar {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; gap: 16px;
  padding: 10px clamp(14px, 4vw, 40px);
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.brand {
  font-weight: 800; font-size: 17px; letter-spacing: .5px; white-space: nowrap;
  color: var(--ink); display: flex; align-items: center; gap: 8px;
}
.brand:hover { text-decoration: none; }
.brand-mark {
  display: inline-grid; place-items: center;
  width: 26px; height: 26px; border-radius: 7px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff; font-size: 14px;
}
.nav {
  display: flex; gap: 4px; overflow-x: auto; flex: 1;
  scrollbar-width: none;
}
.nav::-webkit-scrollbar { display: none; }
.nav a {
  padding: 6px 12px; border-radius: 999px; color: var(--muted);
  font-size: 14px; white-space: nowrap;
}
.nav a:hover { color: var(--ink); background: var(--surface-2); text-decoration: none; }
.nav a.on { color: var(--primary-deep); background: var(--primary-soft); font-weight: 600; }
.themeBtn {
  border: 1px solid var(--line); background: var(--surface); color: var(--ink);
  width: 34px; height: 34px; border-radius: 50%; cursor: pointer; font-size: 15px;
  flex: none;
}
.themeBtn:hover { border-color: var(--primary); }

/* ---------------- Hero ---------------- */
.hero {
  max-width: 880px; margin: 0 auto; padding: clamp(40px, 8vw, 84px) 20px 40px;
  text-align: center;
}
.hero-kicker {
  font-family: var(--mono); font-size: 12px; letter-spacing: 3px;
  color: var(--accent); margin: 0 0 14px;
}
.hero h1 {
  font-size: clamp(30px, 5.4vw, 52px); line-height: 1.18;
  margin: 0 0 16px; font-weight: 800; letter-spacing: -0.5px;
}
.hero .hl {
  background: linear-gradient(120deg, var(--primary), var(--accent));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-sub { color: var(--muted); max-width: 640px; margin: 0 auto 22px; }
.stats {
  display: flex; justify-content: center; gap: clamp(14px, 4vw, 36px);
  color: var(--muted); font-size: 14px; margin-bottom: 24px; flex-wrap: wrap;
}
.stats b { font-size: 20px; color: var(--ink); margin-right: 4px; }
.hero-cta { display: flex; justify-content: center; gap: 12px; flex-wrap: wrap; margin-bottom: 26px; }
.btn {
  display: inline-block; padding: 10px 20px; border-radius: 999px;
  border: 1px solid var(--line); background: var(--surface);
  color: var(--ink); font-weight: 600; font-size: 15px;
  box-shadow: var(--shadow);
}
.btn:hover { text-decoration: none; border-color: var(--primary); transform: translateY(-1px); }
.btn.primary {
  background: linear-gradient(120deg, var(--primary), #f43f5e 130%);
  border-color: transparent; color: #fff;
}
.progress-wrap { display: flex; align-items: center; gap: 12px; max-width: 420px; margin: 0 auto; }
.progress-bar {
  flex: 1; height: 8px; border-radius: 999px; overflow: hidden;
  background: var(--surface-2); border: 1px solid var(--line);
}
.progress-fill {
  height: 100%; width: 0%; border-radius: 999px;
  background: repeating-linear-gradient(90deg, var(--primary) 0 14px, var(--accent) 14px 28px);
  transition: width .4s ease;
}
.progress-text { font-size: 13px; color: var(--muted); white-space: nowrap; }

/* 层积纹分隔（打印机层线母题） */
.layerline {
  height: 10px; max-width: 1040px; margin: 8px auto 30px;
  background: repeating-linear-gradient(180deg, var(--primary) 0 2px, transparent 2px 5px);
  opacity: .35;
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 15%, #000 85%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 15%, #000 85%, transparent);
}

/* ---------------- 模块卡片网格 ---------------- */
.modgrid {
  max-width: 1120px; margin: 0 auto; padding: 0 clamp(14px, 4vw, 40px) 30px;
  display: grid; gap: 16px;
  grid-template-columns: repeat(auto-fill, minmax(330px, 1fr));
}
.modcard {
  --mod: var(--primary);
  background: var(--surface); border: 1px solid var(--line);
  border-top: 3px solid var(--mod);
  border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 16px 18px 12px;
}
.modcard h3 {
  margin: 0 0 10px; font-size: 16px; display: flex; align-items: center; gap: 8px;
}
.modicon { font-size: 18px; }
.modlist, .maplist { list-style: none; margin: 0; padding: 0; }
.modlist li, .maplist li {
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
  padding: 6px 0; border-bottom: 1px dashed var(--line); font-size: 14px;
}
.modlist li:last-child, .maplist li:last-child { border-bottom: 0; }
.modlist a, .maplist a { color: var(--ink); flex: 1; min-width: 0; }
.modlist a:hover, .maplist a:hover { color: var(--primary-deep); text-decoration: none; }
.dot {
  width: 9px; height: 9px; border-radius: 3px; flex: none;
  border: 1.5px solid var(--mod); background: transparent;
}
.dot.done { background: var(--mod); border-color: var(--mod); }
.chip {
  --c: #94a3b8;
  font-size: 11px; font-weight: 600; line-height: 1;
  padding: 4px 8px; border-radius: 999px; white-space: nowrap;
  color: var(--c);
  background: color-mix(in srgb, var(--c) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--c) 35%, transparent);
}
.dep {
  font-family: var(--mono); font-size: 11px; color: var(--muted);
  border: 1px solid var(--line); border-radius: 6px; padding: 1px 5px;
}
.dep:hover { color: var(--primary-deep); text-decoration: none; }

/* ---------------- 使用说明 / howto ---------------- */
.howto {
  max-width: 820px; margin: 0 auto; padding: 10px clamp(14px, 4vw, 40px) 70px;
}
.howto h2 { font-size: 20px; }
.howto ul { padding-left: 20px; color: var(--muted); }
.howto b { color: var(--ink); }

/* ---------------- 文档页 ---------------- */
.dochead {
  --mod: var(--primary);
  padding: clamp(26px, 5vw, 48px) clamp(16px, 4vw, 40px) 22px;
  background:
    linear-gradient(var(--bg), var(--bg)) padding-box,
    linear-gradient(90deg, transparent, var(--line) 12%, var(--line) 88%, transparent);
  border-bottom: 1px solid var(--line);
  position: relative;
  background-image:
    linear-gradient(color-mix(in srgb, var(--line) 55%, transparent) 1px, transparent 1px),
    linear-gradient(90deg, color-mix(in srgb, var(--line) 55%, transparent) 1px, transparent 1px);
  background-size: 26px 26px;
  background-position: center;
}
.dochead::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -1px; height: 3px;
  background: linear-gradient(90deg, var(--mod), transparent 70%);
}
.dochead > * { max-width: 1060px; margin-left: auto; margin-right: auto; }
.crumb {
  font-family: var(--mono); font-size: 12.5px; color: var(--mod);
  letter-spacing: 1px; margin: 0 0 8px;
}
.dochead h1 { margin: 0 0 12px; font-size: clamp(24px, 4vw, 34px); letter-spacing: -0.3px; }
.meta { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.legend-note { font-size: 12.5px; color: var(--muted); }

.docbody {
  display: grid; grid-template-columns: minmax(0, 1fr) 220px;
  gap: 36px; max-width: 1120px; margin: 0 auto;
  padding: 30px clamp(16px, 4vw, 40px) 60px;
}
.prose { max-width: 760px; }

/* 阅读节奏 */
.prose h2 {
  font-size: 20px; margin: 34px 0 12px; padding-bottom: 8px;
  border-bottom: 2px dashed var(--line);
  background-image: repeating-linear-gradient(90deg, var(--mod, var(--primary)) 0 10px, transparent 10px 18px);
  background-size: 100% 2px; background-repeat: no-repeat; background-position: bottom;
}
html[data-theme] .prose h2 { border-bottom-color: transparent; }
.prose h3 { font-size: 16.5px; margin: 22px 0 8px; }
.prose p { margin: 10px 0; }
.prose ul, .prose ol { margin: 10px 0; padding-left: 24px; }
.prose li { margin: 5px 0; }
.prose li::marker { color: var(--primary); font-weight: 700; }

blockquote {
  margin: 16px 0; padding: 12px 18px;
  border-left: 4px solid var(--primary);
  background: var(--primary-soft);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-weight: 500;
}
blockquote p { margin: 0; }

code {
  font-family: var(--mono); font-size: .88em;
  background: var(--surface-2); border: 1px solid var(--line);
  padding: 1px 6px; border-radius: 6px;
}
.code { margin: 16px 0; }
.code pre {
  margin: 0; padding: 16px 18px; overflow-x: auto;
  background: var(--code-bg); color: var(--code-ink);
  border-radius: var(--radius-sm); border: 1px solid var(--line);
  font-family: var(--mono); font-size: 13.5px; line-height: 1.65;
}
.code code { background: none; border: 0; padding: 0; color: inherit; font-size: inherit; }
.tk-str { color: #7ee2a8; }
.tk-cm { color: #64748b; font-style: italic; }
.tk-num { color: #fbbf24; }

.tablewrap { overflow-x: auto; margin: 14px 0; }
table { border-collapse: collapse; width: 100%; font-size: 14px; }
th, td { border: 1px solid var(--line); padding: 8px 12px; text-align: left; vertical-align: top; }
thead th { background: var(--surface-2); font-size: 13px; letter-spacing: .3px; }
tbody tr:nth-child(even) { background: color-mix(in srgb, var(--surface-2) 55%, transparent); }
tbody tr:hover { background: var(--primary-soft); }

hr { border: 0; height: 8px; margin: 22px 0;
  background: repeating-linear-gradient(180deg, var(--line) 0 2px, transparent 2px 5px); }

.broken { color: #ef4444; }

/* 关联盒 / 进度 / 翻页 */
.relbox {
  margin-top: 34px; padding: 16px 18px;
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius);
}
.relbox h2 {
  all: unset; display: block; font-size: 13px; font-weight: 700;
  color: var(--muted); letter-spacing: 1px; margin: 8px 0 4px;
}
.relbox p { margin: 0 0 4px; font-size: 14px; }
.mark {
  display: flex; align-items: center; gap: 8px; margin-top: 22px;
  padding: 12px 16px; border: 1px dashed var(--primary);
  border-radius: var(--radius-sm); background: var(--primary-soft);
  cursor: pointer; font-size: 14.5px; user-select: none;
}
.mark input { width: 17px; height: 17px; accent-color: var(--primary); }
.mark.done { border-style: solid; background: color-mix(in srgb, #22c55e 12%, transparent); border-color: #22c55e; }

.pager { display: flex; justify-content: space-between; gap: 12px; margin-top: 26px; }
.pg {
  flex: 1; min-width: 0; padding: 12px 16px;
  border: 1px solid var(--line); border-radius: var(--radius-sm);
  background: var(--surface); font-size: 14px;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.pg:hover { border-color: var(--primary); text-decoration: none; }
.pg.next { text-align: right; }

/* 目录 */
.toc {
  position: sticky; top: 76px; align-self: start;
  font-size: 13.5px; max-height: calc(100vh - 100px); overflow-y: auto;
}
.toc-title {
  font-family: var(--mono); font-size: 11px; letter-spacing: 2px;
  color: var(--muted); margin-bottom: 8px;
}
.toc ul { list-style: none; margin: 0; padding: 0; border-left: 2px solid var(--line); }
.toc li a {
  display: block; padding: 4px 10px; color: var(--muted);
  border-left: 2px solid transparent; margin-left: -2px;
}
.toc li a:hover { color: var(--ink); text-decoration: none; border-left-color: var(--primary); }

/* ---------------- 搜索页 ---------------- */
.searchbox { max-width: 720px; margin: 6px auto 18px; padding: 0 clamp(16px, 4vw, 40px); }
#q {
  width: 100%; padding: 14px 18px; font-size: 16px; font-family: var(--font);
  border: 2px solid var(--line); border-radius: var(--radius);
  background: var(--surface); color: var(--ink);
}
#q:focus { border-color: var(--primary); outline: none; }
.search-hint { color: var(--muted); font-size: 13px; margin: 10px 2px; }
.results { max-width: 720px; margin: 0 auto 70px; padding: 0 clamp(16px, 4vw, 40px); display: grid; gap: 10px; }
.result {
  display: block; padding: 14px 16px;
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius-sm);
}
.result:hover { border-color: var(--primary); text-decoration: none; }
.result .rt { font-weight: 700; color: var(--ink); display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.result .rx { font-size: 13.5px; color: var(--muted); margin-top: 4px; }
.result mark { background: var(--primary-soft); color: var(--primary-deep); border-radius: 3px; padding: 0 2px; }
.empty { color: var(--muted); text-align: center; padding: 40px 0; }

/* ---------------- 页脚 ---------------- */
.foot {
  text-align: center; color: var(--muted); font-size: 12.5px;
  padding: 26px 16px 40px; border-top: 1px solid var(--line);
}

/* ---------------- 响应式 ---------------- */
@media (max-width: 960px) {
  .docbody { grid-template-columns: 1fr; gap: 8px; }
  .toc {
    position: static; max-height: none;
    border: 1px solid var(--line); border-radius: var(--radius-sm);
    background: var(--surface); padding: 10px 14px;
  }
  .toc ul { border-left: 0; }
  .toc li a { border-left: 0; padding: 3px 0; }
}
@media (max-width: 640px) {
  body { font-size: 15px; }
  .topbar { gap: 10px; }
  .brand span.brand-mark { display: none; }
  .modgrid { grid-template-columns: 1fr; }
  .pg { white-space: normal; }
}

@media print {
  .topbar, .toc, .pager, .mark, .foot { display: none !important; }
  .docbody { grid-template-columns: 1fr; }
}