/* TorqueCraft — 维修手册风 */
:root {
  --torque-char: #2B2D31;
  --torque-orange: #E8791F;
  --torque-silver: #9AA0A6;
  --torque-bench: #F4F2ED;
  --torque-ink: #1F2124;
  --torque-line: #D8D5CE;
  --torque-head: "Arial Narrow", "Helvetica Neue", "Segoe UI", sans-serif;
  --torque-body: "Segoe UI", -apple-system, "Helvetica Neue", Arial, sans-serif;
  --max: 68ch;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--torque-body);
  color: var(--torque-ink);
  background: var(--torque-bench);
  line-height: 1.65;
  font-size: 17px;
}
a { color: var(--torque-char); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { color: var(--torque-orange); }
h1, h2, h3, h4 {
  font-family: var(--torque-head);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--torque-char);
  line-height: 1.15;
}
code { font-family: ui-monospace, "Cascadia Mono", Consolas, monospace; font-size: 0.9em; }
.tabular { font-variant-numeric: tabular-nums; }

/* header */
.site-head { border-bottom: 1px solid var(--torque-char); background: var(--torque-char); color: #fff; }
.bar { max-width: 1080px; margin: 0 auto; padding: 12px 20px; display: flex; align-items: center; gap: 24px; flex-wrap: wrap; }
.brand { font-family: var(--torque-head); font-weight: 700; font-size: 20px; color: #fff; text-decoration: none; letter-spacing: 0.02em; }
.main-nav { display: flex; gap: 18px; flex: 1; }
.nav-link { color: #cfd3d8; text-decoration: none; font-size: 15px; }
.nav-link:hover { color: var(--torque-orange); }
.head-right { margin-left: auto; }
.lang { color: #cfd3d8; text-decoration: none; font-size: 13px; border: 1px solid #5a5f66; padding: 3px 10px; }
.lang:hover { color: var(--torque-orange); border-color: var(--torque-orange); }

/* main */
.site-main { max-width: 1080px; margin: 0 auto; padding: 28px 20px 56px; }

/* hero */
.hero { border-bottom: 1px solid var(--torque-char); padding-bottom: 22px; margin-bottom: 26px; }
.hero h1 { font-size: clamp(28px, 4vw, 42px); margin: 0 0 10px; }
.lede { font-size: 19px; color: #4a4e54; max-width: var(--max); margin: 0; }

/* dashboard gauges */
.dashboard { margin: 8px 0 4px; }
.gauge-cluster { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.gauge { width: 100%; height: auto; display: block; }
.mileage-note { border-top: 1px solid var(--torque-line); margin: 20px 0 0; padding-top: 12px; }
.note { color: #6b7077; font-size: 14px; margin: 0; }

/* index checklist */
.index { margin-top: 32px; }
.index-group { border-top: 1px solid var(--torque-char); padding: 18px 0 8px; }
.group-title { font-size: 20px; margin: 0 0 10px; display: flex; align-items: baseline; gap: 10px; }
.group-title .count { font-size: 13px; color: var(--torque-silver); font-family: var(--torque-body); }
.checklist { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 2px 28px; }
.check-item { display: flex; align-items: baseline; gap: 10px; padding: 4px 0; }
.check { color: var(--torque-silver); }
.check-item a { text-decoration: none; }
.check-item a:hover { color: var(--torque-orange); }

/* article */
.article-head h1 { font-size: clamp(26px, 3.6vw, 38px); margin: 18px 0 6px; }
.meta { color: #6b7077; font-size: 14px; margin: 0 0 18px; }
.crumbs { font-size: 13px; color: #6b7077; margin-bottom: 6px; }
.crumbs a { text-decoration: none; color: #4a4e54; }
.crumbs .sep { margin: 0 6px; color: var(--torque-silver); }
.crumbs .here { color: var(--torque-ink); }

.article-grid { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 36px; align-items: start; }
.article-body { max-width: var(--max); }

/* snapshot bar */
.snapshot-bar { display: flex; flex-wrap: wrap; gap: 0; border: 1px solid var(--torque-char); border-bottom: 3px solid var(--torque-orange); margin-bottom: 26px; }
.snap-cell { padding: 12px 16px; border-right: 1px solid var(--torque-line); flex: 1 1 140px; }
.snap-cell:last-child { border-right: 0; }
.snap-cell.wide { flex: 2 1 260px; }
.snap-k { display: block; font-size: 11px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--torque-silver); margin-bottom: 3px; font-family: var(--torque-head); }
.snap-v { font-size: 15px; }
.dot { display: inline-block; width: 11px; height: 11px; border: 1px solid var(--torque-silver); margin-right: 4px; border-radius: 0; }
.dot.on { background: var(--torque-orange); border-color: var(--torque-orange); }

/* sections */
.sections { }
.sec { border-top: 1px solid var(--torque-line); padding: 22px 0; }
.sec h2 { font-size: 21px; margin: 0 0 12px; }
.sec-num { color: var(--torque-orange); margin-right: 6px; font-size: 15px; vertical-align: 2px; }
.sec p { margin: 0 0 14px; }

/* related */
.related { border-top: 1px solid var(--torque-char); margin-top: 8px; padding-top: 18px; }
.related h2 { font-size: 18px; margin: 0 0 10px; }
.related ul { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 4px 24px; }
.related a { text-decoration: none; font-size: 15px; }

/* side */
.article-side { position: relative; }
.side-sticky { position: sticky; top: 20px; border: 1px solid var(--torque-line); padding: 16px; background: #fff; }
.side-title { font-size: 14px; margin: 0 0 10px; text-transform: uppercase; letter-spacing: 0.05em; color: var(--torque-silver); }
.timeline { width: 100%; height: auto; display: block; }
.side-note { font-size: 12px; color: #6b7077; margin: 8px 0 0; }

/* page (legal / about / contact) */
.page { max-width: var(--max); margin: 0 auto; }
.page h1 { font-size: clamp(26px, 3.6vw, 36px); margin: 0 0 12px; }
.page h2 { font-size: 20px; margin: 26px 0 8px; }
.page .updated { color: #6b7077; font-size: 13px; }
.page p { margin: 0 0 14px; }

/* footer */
.site-foot { background: var(--torque-char); color: #cfd3d8; margin-top: 48px; }
.foot-cols { max-width: 1080px; margin: 0 auto; padding: 32px 20px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.foot-title { font-family: var(--torque-head); font-weight: 700; font-size: 13px; text-transform: uppercase; letter-spacing: 0.06em; color: #fff; margin-bottom: 10px; }
.foot-col a { display: block; color: #cfd3d8; text-decoration: none; font-size: 14px; padding: 2px 0; }
.foot-col a:hover { color: var(--torque-orange); }
.foot-bottom { max-width: 1080px; margin: 0 auto; padding: 16px 20px 28px; border-top: 1px solid #4a4e54; color: #8b919a; font-size: 13px; }

/* responsive */
@media (max-width: 820px) {
  .gauge-cluster { grid-template-columns: 1fr 1fr; }
  .article-grid { grid-template-columns: 1fr; }
  .article-side { order: -1; }
  .side-sticky { position: static; }
  .checklist { grid-template-columns: 1fr; }
  .foot-cols { grid-template-columns: 1fr 1fr; }
}