/* =============================================================================
 * qixiuzhu.com —— 全站样式
 * 浅色为主，跟随系统切深色。中文标题用衬线，拉丁文用 Inter。
 * ========================================================================== */

:root {
  --bg: #fbfaf8;
  --bg-soft: #f4f2ee;
  --surface: #ffffff;
  --text: #1b1a18;
  --text-soft: #55524c;
  --muted: #86827a;
  --line: #e4e0d8;
  --line-soft: #efece5;
  --accent: #2f6b4f;
  --accent-soft: #e9f1eb;
  --accent-text: #23543e;
  --warn: #9a6b1e;
  --radius: 12px;
  --radius-sm: 8px;
  --maxw: 760px;
  --maxw-wide: 1080px;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-serif: "Noto Serif SC", Georgia, "Songti SC", serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14150f;
    --bg-soft: #1a1c15;
    --surface: #1b1d16;
    --text: #eceadf;
    --text-soft: #b8b5a8;
    --muted: #8e8b80;
    --line: #2d3026;
    --line-soft: #24271e;
    --accent: #86c9a2;
    --accent-soft: #1e2a23;
    --accent-text: #9ed7b4;
    --warn: #d6a95c;
  }
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: inherit; }

img { max-width: 100%; height: auto; }

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: var(--bg);
  padding: 10px 16px;
  z-index: 100;
}
.skip:focus { left: 8px; top: 8px; }

/* ---------------------------------------------------------------- header */

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
  padding: 12px 24px;
  background: color-mix(in srgb, var(--bg) 90%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  text-decoration: none;
  min-width: 0;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  flex: none;
  border-radius: 9px;
  background: var(--accent-soft);
  color: var(--accent-text);
  font-family: var(--font-serif);
  font-size: 18px;
  line-height: 1;
}

.brand-text { display: flex; flex-direction: column; min-width: 0; }
.brand-name { font-weight: 650; font-size: 15px; line-height: 1.3; }
.brand-sub {
  font-size: 11.5px;
  color: var(--muted);
  line-height: 1.3;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

.nav { display: flex; gap: 16px; font-size: 14px; flex-wrap: wrap; }
.nav a {
  text-decoration: none;
  color: var(--text-soft);
  padding: 3px 0;
  border-bottom: 1.5px solid transparent;
  transition: color .15s, border-color .15s;
  white-space: nowrap;
}
.nav a:hover { color: var(--text); }
.nav a[aria-current="page"] { color: var(--accent-text); border-bottom-color: var(--accent); }

/* 语言切换器 */
.lang-switch {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: 999px;
  overflow: hidden;
  background: var(--surface);
}
.lang-item {
  padding: 4px 9px;
  font-size: 11.5px;
  letter-spacing: .03em;
  text-decoration: none;
  color: var(--muted);
  border-right: 1px solid var(--line-soft);
  transition: background .15s, color .15s;
}
.lang-item:last-child { border-right: 0; }
.lang-item:hover { background: var(--bg-soft); color: var(--text); }
.lang-item.active { background: var(--accent); color: var(--bg); }
.lang-full { display: none; }

/* ---------------------------------------------------------------- layout */

main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px 96px;
}

/* 车型列表、谱系这类宽内容单独放宽 */
main:has(.card-grid-cars),
main:has(.brand-block),
main:has(.data-table) {
  max-width: var(--maxw-wide);
}

.page-head { padding: 52px 0 8px; }
.page-head h1 {
  margin: 0 0 10px;
  font-family: var(--font-serif);
  font-size: clamp(28px, 5vw, 40px);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: .01em;
}
.lede { margin: 0; color: var(--text-soft); font-size: 17px; max-width: 58ch; }
.intro { margin: 22px 0 0; color: var(--text-soft); max-width: 62ch; }

.section { padding: 40px 0 0; }
.section-title {
  margin: 0 0 16px;
  font-size: 12.5px;
  font-weight: 650;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--muted);
}
.section-title a { text-decoration: none; }
.section-title a:hover { color: var(--accent-text); }

.muted { color: var(--muted); }

/* ------------------------------------------------------------------ hero */

.hero { padding: 84px 0 56px; }
.eyebrow {
  margin: 0 0 14px;
  font-size: 11.5px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--muted);
}
.hero-title {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 16px;
  line-height: 1.1;
}
.hero-cn {
  font-family: var(--font-serif);
  font-size: clamp(40px, 9vw, 60px);
  font-weight: 700;
  letter-spacing: .03em;
}
.hero-en { font-size: clamp(16px, 3vw, 21px); font-weight: 500; color: var(--muted); }
.hero-tagline { margin: 24px 0 0; max-width: 50ch; font-size: 17px; color: var(--text-soft); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }

.btn {
  display: inline-block;
  padding: 9px 19px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  font-size: 14px;
  text-decoration: none;
  transition: border-color .15s, transform .15s;
}
.btn:hover { border-color: var(--accent); transform: translateY(-1px); }
.btn-primary { background: var(--accent); border-color: var(--accent); color: var(--bg); }

/* ------------------------------------------------------------------ 统计 */

/* flex 而不是 grid：最后一行的格子会自动撑满，不留半截空位 */
.stat-row {
  display: flex;
  flex-wrap: wrap;
  margin: 28px 0 0;
  padding: 0;
  background: var(--surface);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
}
.stat {
  flex: 1 1 118px;
  padding: 15px 16px;
  margin: 0;
  /* 内阴影画分隔线，容器边缘不会出现双线 */
  box-shadow: inset -1px -1px 0 var(--line-soft);
}
.stat dt { font-size: 11.5px; color: var(--muted); line-height: 1.5; }
.stat dd {
  margin: 3px 0 0;
  font-size: 21px;
  font-weight: 650;
  font-variant-numeric: tabular-nums;
  letter-spacing: -.01em;
}

/* ------------------------------------------------------------------ 卡片 */

.card-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
}
.card-grid-2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.card-grid-cars { grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); }

.card {
  display: block;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  text-decoration: none;
  transition: border-color .15s, transform .15s;
}
.card:hover { border-color: var(--accent); transform: translateY(-2px); }
.card-tag {
  display: inline-block;
  margin-bottom: 8px;
  font-size: 11px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--muted);
}
.card-title { margin: 0 0 6px; font-size: 16.5px; font-weight: 650; line-height: 1.4; }
.card-lede { margin: 0; font-size: 14px; color: var(--text-soft); line-height: 1.6; }
.card-meta { margin: 9px 0 0; font-size: 12.5px; color: var(--muted); }

/* 车型卡：带图 */
.card-car { padding: 0; overflow: hidden; display: flex; flex-direction: column; }
.card-photo {
  display: block;
  aspect-ratio: 16 / 10;
  background: var(--bg-soft);
  overflow: hidden;
}
.card-photo img { width: 100%; height: 100%; object-fit: cover; display: block; }
.card-photo-empty {
  background: repeating-linear-gradient(45deg, var(--bg-soft), var(--bg-soft) 8px, var(--surface) 8px, var(--surface) 16px);
}
.card-car .card-body { display: block; padding: 14px 16px 16px; }
.card-car .card-title { font-size: 15px; }
.card-car .card-lede {
  font-size: 13px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ------------------------------------------------------------- 面包屑/目录 */

.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-top: 28px;
  font-size: 12.5px;
  color: var(--muted);
}
.crumbs a { text-decoration: none; color: var(--muted); }
.crumbs a:hover { color: var(--accent-text); }
.crumb-sep { opacity: .5; }

.toc {
  margin: 28px 0 0;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-soft);
}
.toc-label {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--muted);
}
.toc ol { margin: 0; padding-left: 18px; font-size: 14px; }
.toc li { margin: 3px 0; }
.toc a { color: var(--text-soft); text-decoration: none; }
.toc a:hover { color: var(--accent-text); text-decoration: underline; }
.toc .toc-l3 { padding-left: 12px; font-size: 13.5px; }

/* ------------------------------------------------------------------ 正文 */

.prose { margin-top: 26px; }
.prose > :first-child { margin-top: 0; }
.prose h2 {
  margin: 40px 0 14px;
  font-family: var(--font-serif);
  font-size: 23px;
  font-weight: 700;
  line-height: 1.35;
  padding-top: 8px;
  border-top: 1px solid var(--line-soft);
}
.prose h3 { margin: 30px 0 10px; font-size: 18px; font-weight: 650; }
.prose h4 { margin: 24px 0 8px; font-size: 15.5px; font-weight: 650; color: var(--text-soft); }
.prose p { margin: 0 0 16px; }
.prose ul, .prose ol { margin: 0 0 16px; padding-left: 22px; }
.prose li { margin: 5px 0; }
.prose li > ul, .prose li > ol { margin: 6px 0; }
.prose a { color: var(--accent-text); text-decoration: underline; text-underline-offset: 2px; }
.prose img { border-radius: var(--radius-sm); border: 1px solid var(--line-soft); margin: 8px 0; }
.prose hr { border: 0; border-top: 1px solid var(--line); margin: 32px 0; }
.prose strong { font-weight: 650; }
.prose mark { background: var(--accent-soft); color: inherit; padding: 0 3px; border-radius: 3px; }

.prose code {
  font-family: var(--font-mono);
  font-size: .88em;
  background: var(--bg-soft);
  border: 1px solid var(--line-soft);
  border-radius: 4px;
  padding: 1px 5px;
}
.prose pre.code {
  margin: 0 0 18px;
  padding: 14px 16px;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  overflow-x: auto;
  font-size: 13px;
  line-height: 1.6;
}
.prose pre.code code { background: none; border: 0; padding: 0; font-size: inherit; }

.prose blockquote {
  margin: 0 0 18px;
  padding: 2px 0 2px 16px;
  border-left: 3px solid var(--line);
  color: var(--text-soft);
}
.prose blockquote p:last-child { margin-bottom: 0; }

.wikilink-plain { color: var(--text-soft); border-bottom: 1px dotted var(--line); }
.embed-ref { color: var(--muted); font-size: .9em; }

/* callout */
.callout {
  margin: 0 0 18px;
  padding: 13px 16px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--muted);
  border-radius: var(--radius-sm);
  background: var(--bg-soft);
}
.callout-head { display: flex; align-items: baseline; gap: 8px; }
.callout-icon { color: var(--muted); flex: none; }
.callout-title { font-weight: 650; font-size: 14.5px; }
.callout-body { margin-top: 6px; font-size: 14.5px; color: var(--text-soft); }
.callout-body > :last-child { margin-bottom: 0; }
.callout-info { border-left-color: #3b7dd8; }
.callout-warning, .callout-danger { border-left-color: var(--warn); }
.callout-tip, .callout-success { border-left-color: var(--accent); }

/* ------------------------------------------------------------------ 表格 */

.table-wrap {
  overflow-x: auto;
  margin: 0 0 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  -webkit-overflow-scrolling: touch;
}
table { border-collapse: collapse; width: 100%; font-size: 14px; }
th, td { padding: 9px 13px; border-bottom: 1px solid var(--line-soft); text-align: left; }
thead th {
  background: var(--bg-soft);
  font-weight: 650;
  font-size: 12.5px;
  letter-spacing: .02em;
  color: var(--text-soft);
  white-space: nowrap;
  position: sticky;
  top: 0;
}
tbody tr:last-child td { border-bottom: 0; }
tbody tr:hover { background: var(--bg-soft); }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
td.nowrap { white-space: nowrap; }
.data-table td a { color: var(--text); text-decoration: none; }
.data-table td a:hover { color: var(--accent-text); text-decoration: underline; }

/* 规格表 */
.spec { margin-top: 34px; }
.spec-title {
  margin: 0 0 12px;
  font-size: 12.5px;
  font-weight: 650;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--muted);
}
.spec-table th[scope="row"] {
  width: 34%;
  min-width: 140px;
  color: var(--text-soft);
  font-weight: 500;
  background: var(--bg-soft);
  vertical-align: top;
}
.spec-table td { vertical-align: top; }
.unit { color: var(--muted); font-size: .88em; }

/* ------------------------------------------------------------------ 车型头 */

.car-head { display: flex; gap: 24px; flex-wrap: wrap; align-items: flex-start; padding-top: 24px; }
.car-photo {
  position: relative;
  flex: 1 1 300px;
  max-width: 460px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--bg-soft);
}
.car-photo img { width: 100%; display: block; aspect-ratio: 16/10; object-fit: cover; }
.car-photo .approx {
  position: absolute;
  right: 8px;
  bottom: 8px;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 1px 6px;
  font-size: 11px;
  color: var(--muted);
}
.car-headtext { flex: 1 1 280px; min-width: 0; }
.car-headtext h1 {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-size: clamp(24px, 4vw, 33px);
  font-weight: 700;
  line-height: 1.25;
}
.car-meta { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0 0; font-size: 12.5px; color: var(--muted); }
.chip-static {
  display: inline-block;
  padding: 2px 9px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 11.5px;
  color: var(--text-soft);
}

/* ------------------------------------------------------------------ 谱系树 */

.rel-legend { display: flex; flex-wrap: wrap; gap: 8px; margin: 22px 0 0; }
.rel-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 11.5px;
  color: var(--text-soft);
  background: var(--surface);
}
.rel-arrow { color: var(--accent-text); font-size: 13px; }

.brand-block { padding-top: 34px; }
.family-title { margin: 0 0 4px; font-size: 17px; font-weight: 650; }
.family-tag { margin: 0 0 12px; font-size: 13.5px; color: var(--muted); max-width: 62ch; }

.tree, .tree-children { list-style: none; margin: 0; padding: 0; }
.tree-children { margin-left: 20px; padding-left: 16px; border-left: 1px solid var(--line); }
.tree-node { margin: 6px 0; position: relative; }
.tree-children > .tree-node::before {
  content: "";
  position: absolute;
  left: -16px;
  top: 17px;
  width: 12px;
  height: 1px;
  background: var(--line);
}
.tree-card {
  display: inline-flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 9px;
  padding: 6px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  text-decoration: none;
  font-size: 14px;
  transition: border-color .15s, background .15s;
}
.tree-card:hover { border-color: var(--accent); background: var(--accent-soft); }
.tree-arrow { color: var(--muted); font-size: 12px; }
.tree-name { font-weight: 600; }
.tree-years { color: var(--muted); font-size: 12px; font-variant-numeric: tabular-nums; }
.tree-rel { color: var(--accent-text); font-size: 11.5px; }

.lineage-line { margin: 8px 0; font-size: 14.5px; }
.lineage-line a { color: var(--accent-text); }

/* ------------------------------------------------------------------ 筛选 */

.filters { display: flex; flex-wrap: wrap; gap: 8px; margin: 24px 0 22px; }
.chip {
  font: inherit;
  font-size: 13px;
  padding: 5px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--text-soft);
  cursor: pointer;
  transition: border-color .15s, background .15s, color .15s;
}
.chip:hover { border-color: var(--accent); color: var(--text); }
.chip.active { background: var(--accent); border-color: var(--accent); color: var(--bg); }

/* ------------------------------------------------------------------ 提示 */

.lang-notice,
.honesty-note {
  margin: 24px 0 0;
  padding: 11px 15px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--warn);
  border-radius: var(--radius-sm);
  background: var(--bg-soft);
  font-size: 13.5px;
  color: var(--text-soft);
}
.honesty-note { border-left-color: var(--accent); }

/* 定义列表（指标口径） */
.def-list { margin: 30px 0 0; padding: 0; }
.def {
  padding: 16px 0;
  border-top: 1px solid var(--line-soft);
}
.def:first-child { border-top: 0; }
.def dt { font-weight: 650; font-size: 16px; margin-bottom: 4px; }
.def dd { margin: 0; color: var(--text-soft); font-size: 14.5px; max-width: 64ch; }

.links { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 8px 20px; }
.links a { color: var(--accent-text); }

/* ------------------------------------------------------------------ footer */

.site-footer {
  border-top: 1px solid var(--line);
  padding: 34px 24px 26px;
  background: var(--bg-soft);
}
.footer-inner {
  max-width: var(--maxw-wide);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  justify-content: space-between;
  align-items: flex-start;
}
.footer-name { margin: 0 0 4px; font-weight: 650; font-size: 15px; }
.footer-note { margin: 0; font-size: 13px; color: var(--muted); }
.footer-legal {
  max-width: var(--maxw-wide);
  margin: 26px auto 0;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  color: var(--muted);
}

/* --------------------------------------------------------- 语言选择落地页 */

.redirect-page { display: grid; place-items: center; min-height: 100vh; text-align: center; }
.redirect-page main { padding: 40px 24px; }
.redirect-page h1 { font-family: var(--font-serif); font-size: 30px; margin: 0 0 8px; }
.redirect-page p { color: var(--muted); margin: 0 0 22px; }
.lang-list { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; }
.lang-list a {
  display: inline-block;
  padding: 8px 18px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  text-decoration: none;
}
.lang-list a:hover { border-color: var(--accent); }

/* ------------------------------------------------------------------ 响应式 */

@media (min-width: 900px) {
  .lang-item { padding: 4px 11px; }
}

@media (max-width: 860px) {
  .brand-sub { display: none; }
  .site-header { padding: 10px 16px; gap: 10px; }
  .header-right { width: 100%; justify-content: space-between; }
  .nav { gap: 13px; font-size: 13.5px; }
  main { padding: 0 18px 72px; }
  .page-head { padding-top: 34px; }
  .hero { padding: 54px 0 44px; }
  .car-head { gap: 18px; }
  thead th { position: static; }
}

@media (max-width: 480px) {
  .lang-item { padding: 4px 7px; font-size: 11px; }
  .stat dd { font-size: 18px; }
  .card-grid-cars { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); }
}

@media print {
  .site-header, .site-footer, .lang-switch, .filters, .toc { display: none; }
  main { max-width: none; }
}

/* ------------------------------------------------------------------ 精选 */

.feature-lede { margin: -6px 0 18px; font-size: 14px; }

.feature-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.feature {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  overflow: hidden;
  text-decoration: none;
  transition: border-color .15s, transform .15s;
}
.feature:hover { border-color: var(--accent); transform: translateY(-2px); }

.feature-img {
  display: block;
  aspect-ratio: 16 / 10;
  background: var(--bg-soft);
  border-bottom: 1px solid var(--line-soft);
}
.feature-img img { width: 100%; height: 100%; object-fit: cover; display: block; }

.feature-text { display: block; padding: 15px 17px 17px; }
.feature-kicker {
  display: block;
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--accent-text);
  margin-bottom: 6px;
}
.feature-title {
  display: block;
  font-size: 15.5px;
  font-weight: 650;
  line-height: 1.45;
  /* 视频标题常带一串 emoji，限两行免得把卡片撑歪 */
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.feature-meta {
  display: block;
  margin-top: 7px;
  font-size: 12.5px;
  color: var(--muted);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}