/* FabLab — 工程蓝图(blueprint)风：蓝图蓝底 + 白线框 + 虚线测量标注 + 十字标记
   规则：全 monospace、圆角 0、无卡片填充、无 emoji、无动画(hover 为瞬时换色，无 transition/transform) */
:root {
  --draft-paper: #1e3a5f;
  --draft-ink: #e8f0f8;
  --draft-cyan: #7fb4e8;
  --draft-fade: #9fb8d0;
  --draft-grid: rgba(232, 240, 248, 0.07);
  --draft-hair: rgba(232, 240, 248, 0.45);
  --draft-wash: rgba(232, 240, 248, 0.08);
  --draft-face: "SFMono-Regular", "Cascadia Mono", Consolas, monospace;
}

* { box-sizing: border-box; border-radius: 0; }

body {
  margin: 0;
  background-color: var(--draft-paper);
  background-image:
    repeating-linear-gradient(to bottom, var(--draft-grid) 0 1px, transparent 1px 26px),
    repeating-linear-gradient(to right, var(--draft-grid) 0 1px, transparent 1px 26px);
  color: var(--draft-ink);
  font-family: var(--draft-face);
  font-size: 15px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
a:hover { color: var(--draft-cyan); }
a:focus-visible { outline: 1px dashed var(--draft-cyan); outline-offset: 3px; }
::selection { background: var(--draft-ink); color: var(--draft-paper); }

/* ---------- 图签栏（顶栏） ---------- */
.tb {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  padding: 0.7rem clamp(1rem, 4vw, 2.5rem);
  background: var(--draft-paper);
  border-bottom: 1px solid var(--draft-ink);
  box-shadow: 0 3px 0 0 var(--draft-paper), 0 4px 0 0 var(--draft-hair);
}
.tb__brand {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-size: 0.92rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.18em;
}
.tb__mark { color: var(--draft-cyan); font-size: 1.05rem; letter-spacing: 0; }
.tb__nav { display: flex; align-items: center; flex-wrap: wrap; }
.tb__link {
  padding: 0 0.85rem; border-left: 1px dashed var(--draft-hair);
  font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.16em; color: var(--draft-fade);
}
.tb__link:first-child { border-left: 0; }
.tb__link:hover { color: var(--draft-ink); }
.tb__link.is-active { color: var(--draft-ink); text-decoration: underline; text-decoration-style: dashed; text-underline-offset: 5px; }
.tb__lang {
  margin-left: 0.9rem; padding: 0.16rem 0.6rem;
  border: 1px dashed var(--draft-ink); font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.14em;
}
.tb__lang:hover { background: var(--draft-ink); color: var(--draft-paper); }

/* ---------- 图纸标题块(hero) ---------- */
.tblk {
  position: relative;
  max-width: 900px; margin: clamp(1.4rem, 5vw, 3rem) auto clamp(1.6rem, 5vw, 2.6rem);
  padding: clamp(1.4rem, 4vw, 2.4rem) clamp(1.1rem, 4vw, 2.2rem);
  border: 1px solid var(--draft-ink);
}
.tblk::before, .tblk::after {
  content: "+"; position: absolute; z-index: 1;
  font-size: 1rem; line-height: 1; color: var(--draft-ink); background: var(--draft-paper);
}
.tblk::before { top: -0.56em; left: -0.4em; }
.tblk::after { bottom: -0.56em; right: -0.4em; }
.tblk__tag {
  display: block; margin: 0 0 1rem; padding-bottom: 0.7rem;
  border-bottom: 1px dashed var(--draft-hair);
  font-size: 0.68rem; text-transform: uppercase; letter-spacing: 0.24em; color: var(--draft-cyan);
}
.tblk__h { margin: 0 0 0.85rem; font-size: clamp(1.5rem, 4.4vw, 2.5rem); line-height: 1.14; font-weight: 700; }
.tblk__lead { margin: 0 0 1.6rem; max-width: 62ch; color: var(--draft-fade); }
.tblk__cta {
  display: inline-block; padding: 0.6rem 1.25rem;
  border: 1px solid var(--draft-ink);
  font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.2em;
}
.tblk__cta::before { content: "+ "; color: var(--draft-cyan); }
.tblk__cta:hover { background: var(--draft-ink); color: var(--draft-paper); }

/* ---------- 图纸分区 ---------- */
.band { max-width: 1080px; margin: 0 auto; padding: 0.9rem clamp(1rem, 4vw, 2.5rem) 2.7rem; }
.band__h {
  display: flex; align-items: center; gap: 0.7rem;
  margin: 0 0 1.05rem; padding-bottom: 0.5rem;
  border-bottom: 1px dashed var(--draft-hair);
  font-size: 0.72rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.22em;
}
.band__h::before { content: "+"; font-size: 0.9rem; color: var(--draft-cyan); letter-spacing: 0; }

/* ---------- 分类明细表(非卡片：共享细线的表格) ---------- */
.legend {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(215px, 1fr));
  border-top: 1px solid var(--draft-ink); border-left: 1px solid var(--draft-ink);
}
.legend__item {
  display: flex; align-items: baseline; justify-content: space-between; gap: 0.6rem;
  padding: 0.65rem 0.9rem;
  border-right: 1px solid var(--draft-ink); border-bottom: 1px solid var(--draft-ink);
}
.legend__item:hover { background: var(--draft-wash); }
.legend__name { font-size: 0.82rem; }
.legend__n { color: var(--draft-cyan); font-size: 0.76rem; }
.legend__n::before { content: "["; }
.legend__n::after { content: "]"; }

/* ---------- 图纸清单(替代卡片网格) ---------- */
.sheets {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  border-top: 1px solid var(--draft-ink); border-left: 1px solid var(--draft-ink);
}
.sheet {
  position: relative; display: block;
  padding: 1rem 2.1rem 1.1rem 1.1rem;
  border-right: 1px solid var(--draft-ink); border-bottom: 1px solid var(--draft-ink);
}
.sheet::after { content: "+"; position: absolute; top: 0.5rem; right: 0.6rem; font-size: 0.85rem; color: var(--draft-fade); }
.sheet:hover { background: var(--draft-wash); }
.sheet:hover::after { color: var(--draft-cyan); }
.sheet__code {
  display: block; margin-bottom: 0.5rem;
  font-size: 0.66rem; text-transform: uppercase; letter-spacing: 0.2em; color: var(--draft-cyan);
}
.sheet__name { display: block; margin-bottom: 0.7rem; font-size: 0.98rem; font-weight: 700; line-height: 1.3; }
.sheet__spec {
  display: block; padding-top: 0.5rem; border-top: 1px dashed var(--draft-hair);
  font-size: 0.72rem; color: var(--draft-fade);
}

/* ---------- 内页 ---------- */
.page { max-width: 1080px; margin: 0 auto; padding: 2rem clamp(1rem, 4vw, 2.5rem) 4rem; }
.page__h {
  margin: 0 0 0.55rem; padding-bottom: 0.6rem; border-bottom: 1px solid var(--draft-ink);
  font-size: clamp(1.4rem, 3.6vw, 2rem); text-transform: uppercase; letter-spacing: 0.06em;
}
.page__lead { max-width: 68ch; margin: 0 0 2.2rem; color: var(--draft-fade); }
.page__body { max-width: 68ch; color: var(--draft-ink); }
.page__body a { color: var(--draft-cyan); text-decoration: underline; text-decoration-style: dashed; text-underline-offset: 3px; }
/* 长文必备页（about / contact / privacy / terms）正文排版 */
.page__body h2 {
  margin: 2rem 0 0.7rem; padding-bottom: 0.4rem;
  border-bottom: 1px dashed var(--draft-hair);
  font-size: 0.78rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.18em;
}
.page__body h2::before { content: "+ "; color: var(--draft-cyan); letter-spacing: 0; }
.page__body p { margin: 0 0 1.05rem; line-height: 1.7; }
.page__body ul { margin: 0 0 1.15rem; padding-left: 1.1rem; list-style: none; }
.page__body li { position: relative; margin-bottom: 0.5rem; padding-left: 0.9rem; line-height: 1.65; }
.page__body li::before { content: "+"; position: absolute; left: 0; color: var(--draft-cyan); }
.cluster { margin-bottom: 2.5rem; }
.cluster__h {
  display: flex; align-items: baseline; gap: 0.7rem;
  margin: 0 0 0.9rem; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.18em;
}
.cluster__h::before { content: "+"; color: var(--draft-cyan); letter-spacing: 0; }
.cluster__n { color: var(--draft-fade); font-size: 0.72rem; }

/* ---------- 教程图(详情页) ---------- */
.route {
  margin-bottom: 1.3rem; font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.14em; color: var(--draft-fade);
}
.route__a:hover { color: var(--draft-ink); }
.route__sep { padding: 0 0.5rem; color: var(--draft-hair); }

.doc { border-top: 3px solid var(--draft-ink); padding-top: 1.3rem; }
.doc__hero { margin: 0 0 1.3rem; border: 1px solid var(--draft-hair); }
.doc__hero img { display: block; width: 100%; height: auto; }
.doc__cat {
  display: inline-block; margin-bottom: 0.7rem; padding: 0.18rem 0.6rem;
  border: 1px dashed var(--draft-cyan);
  font-size: 0.66rem; text-transform: uppercase; letter-spacing: 0.2em; color: var(--draft-cyan);
}
.doc__h { margin: 0 0 0.6rem; font-size: clamp(1.5rem, 4vw, 2.2rem); line-height: 1.16; }
.doc__lead { margin: 0 0 1.2rem; max-width: 70ch; color: var(--draft-fade); }
.doc__meta {
  display: flex; flex-wrap: wrap; margin: 0 0 1.9rem;
  border-top: 1px dashed var(--draft-hair); border-bottom: 1px dashed var(--draft-hair);
}
.field {
  padding: 0.6rem 1.2rem 0.6rem 0; margin-right: 1.2rem;
  border-right: 1px dashed var(--draft-hair);
  font-size: 0.74rem; text-transform: uppercase; letter-spacing: 0.1em;
}
.field:last-child { border-right: 0; margin-right: 0; }
.field b { margin-right: 0.5rem; color: var(--draft-cyan); font-weight: 700; }

.supply { margin-bottom: 1.5rem; }
.parts { display: flex; flex-wrap: wrap; gap: 0.4rem 1.4rem; list-style: none; margin: 0; padding: 0; }
.part { font-size: 0.82rem; color: var(--draft-ink); }
.part::before { content: "[ ] "; color: var(--draft-fade); }
.part--tool::before { content: "[+] "; color: var(--draft-cyan); }

.ops { margin-bottom: 1.5rem; }
.ops__list { list-style: none; margin: 0; padding: 0; }
.op { display: flex; gap: 1rem; padding-bottom: 1.2rem; }
.op + .op { border-top: 1px dashed var(--draft-hair); padding-top: 1.2rem; }
.op__no {
  flex: 0 0 2.3rem; height: 1.6rem;
  display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--draft-ink);
  font-size: 0.72rem; letter-spacing: 0.08em;
}
.op__h { margin: 0 0 0.28rem; font-size: 0.98rem; }
.op__t { margin: 0; color: var(--draft-fade); }
.op__body { flex: 1 1 auto; min-width: 0; }
.op__art { flex: 0 0 auto; align-self: center; }
.op__art svg { display: block; width: 150px; height: auto; }

/* ---------- 深入说明（参考性正文）---------- */
.deepwrap { margin: 1.9rem 0 0.4rem; border-top: 1px dashed var(--draft-hair); padding-top: 1.6rem; }
.deep { margin-bottom: 1.9rem; }
.deep__p { margin: 0 0 0.75rem; max-width: 74ch; color: var(--draft-fade); }
.deep__p:last-child { margin-bottom: 0; }

/* ---------- 常见问题 ---------- */
.faq { margin-top: 1.9rem; border-top: 1px dashed var(--draft-hair); padding-top: 1.6rem; }
.faq__list { margin: 0; }
.faq__item { padding-bottom: 1.1rem; margin-bottom: 1.1rem; border-bottom: 1px dashed var(--draft-hair); }
.faq__item:last-child { padding-bottom: 0; margin-bottom: 0; border-bottom: 0; }
.faq__q { margin: 0 0 0.4rem; font-size: 0.95rem; font-weight: 700; }
.faq__q::before { content: "? "; color: var(--draft-cyan); }
.faq__a { margin: 0; max-width: 74ch; color: var(--draft-fade); font-size: 0.9rem; }

.note {
  margin-top: 1.5rem; padding: 0.9rem 1.1rem;
  border: 1px dashed var(--draft-cyan);
  font-size: 0.86rem;
}
.note b { margin-right: 0.5rem; color: var(--draft-cyan); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.18em; }

/* ---------- 图底栏 ---------- */
.colophon {
  display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 0.5rem 1.5rem;
  margin-top: 2rem; padding: 1.5rem clamp(1rem, 4vw, 2.5rem) 3rem;
  border-top: 1px solid var(--draft-ink);
  font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.16em; color: var(--draft-fade);
}
.colophon p { margin: 0; }
.colophon__link:hover { color: var(--draft-ink); }
.colophon__links span { padding: 0 0.5rem; color: var(--draft-hair); }

.fallback { max-width: 640px; margin: 3rem auto; padding: 2rem; text-align: center; color: var(--draft-fade); }

@media (max-width: 700px) {
  .tb { flex-wrap: wrap; gap: 0.5rem; }
  .tb__link { padding: 0 0.6rem; }
  .legend, .sheets { grid-template-columns: 1fr; }
  .op { flex-direction: column; gap: 0.5rem; }
  .op__no { flex: 0 0 auto; width: 2.3rem; }
  .op__art { align-self: flex-start; }
}

/* ---------- 编辑导语 ---------- */
.tblk__intro { margin: 0 0 1.6rem; max-width: 62ch; color: var(--draft-ink); }
.tblk__intro p { margin: 0 0 0.85rem; }
.tblk__intro p:last-child { margin-bottom: 0; }
.page__intro { max-width: 68ch; margin: 0 0 2.2rem; color: var(--draft-fade); }
.page__intro p { margin: 0 0 0.85rem; }
.page__intro p:last-child { margin-bottom: 0; }
.cluster__intro { max-width: 68ch; margin: -0.2rem 0 1rem; color: var(--draft-fade); font-size: 0.86rem; }