/* ==========================================================================
   LOYUVE（洛煜）官网 · 与微信小程序统一的设计系统
   深 #1c1c1c / 浅 #faf9f7 / 金 #b39257 / 米白 #EAE6DF
   ========================================================================== */

:root {
  --ink: #1c1c1c;
  --ink-2: #161616;
  --ink-3: #242424;
  --paper: #faf9f7;
  --gold: #b39257;
  --ivory: #eae6df;
  --line-dark: rgba(234, 230, 223, 0.12);
  --line-gold: rgba(179, 146, 87, 0.3);
  --line-ink: rgba(28, 28, 28, 0.12);
  --serif: "Songti SC", "STSong", "Noto Serif SC", "Source Han Serif SC", serif;
  --sans: "PingFang SC", "Helvetica Neue", "Microsoft YaHei", Arial, sans-serif;
  --max: 1080px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background: var(--ink);
  color: var(--ivory);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  letter-spacing: 0.02em;
}

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }

/* ---------- 导航 ---------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 clamp(20px, 4vw, 56px);
  height: 64px;
  background: rgba(28, 28, 28, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(234, 230, 223, 0.08);
}
.nav .brand img { height: 22px; width: auto; }
.nav .links { display: flex; gap: clamp(16px, 2.4vw, 34px); }
.nav .links a {
  font-size: 13px;
  letter-spacing: 0.14em;
  color: rgba(234, 230, 223, 0.7);
  transition: color .25s;
}
.nav .links a:hover,
.nav .links a.on { color: var(--gold); }

/* ---------- 通用区块 ---------- */
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 clamp(20px, 4vw, 48px); }
.sec { padding: clamp(64px, 9vw, 112px) 0; }
.sec.dark { background: var(--ink); color: var(--ivory); }
.sec.light { background: var(--paper); color: #1a1a1b; }
.sec.tight { padding: clamp(40px, 6vw, 72px) 0; }

.eyebrow {
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: 0.42em;
  text-transform: uppercase;
  color: var(--gold);
}
.h1, .sec-title {
  font-family: var(--serif);
  font-weight: 300;
  letter-spacing: 0.05em;
  line-height: 1.45;
}
.h1 { font-size: clamp(28px, 4.4vw, 46px); margin: 16px 0 12px; }
.sec-title { font-size: clamp(24px, 3.2vw, 34px); margin: 14px 0 30px; }
.sub {
  font-size: 14px;
  color: rgba(234, 230, 223, 0.55);
  letter-spacing: 0.06em;
}
.light .sub { color: rgba(28, 28, 28, 0.5); }
.lead, .lead-lg {
  font-size: 15px;
  line-height: 2;
  color: rgba(234, 230, 223, 0.82);
}
.lead-lg { font-family: var(--serif); font-size: clamp(17px, 2vw, 21px); line-height: 2.1; color: rgba(234, 230, 223, 0.9); }
.light .lead, .light .lead-lg { color: rgba(28, 28, 28, 0.78); }
.ln { display: block; }
.note { font-size: 13px; line-height: 1.9; color: rgba(234, 230, 223, 0.45); margin-top: 18px; }
.light .note { color: rgba(28, 28, 28, 0.45); }

.head { text-align: left; }

.quote {
  font-family: var(--serif);
  font-size: clamp(19px, 2.4vw, 25px);
  color: var(--gold);
  letter-spacing: 0.18em;
  margin: clamp(36px, 5vw, 56px) 0 0;
  line-height: 1.8;
}

/* ---------- 页首 ---------- */
.hero {
  position: relative;
  height: min(78vh, 720px);
  min-height: 460px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--ink);
}
.hero img.hero-img {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
}
.hero-mask {
  position: absolute; inset: 0;
  background:
    linear-gradient(90deg, rgba(18,18,18,.9) 0%, rgba(18,18,18,.68) 40%, rgba(18,18,18,.18) 74%, rgba(18,18,18,.02) 100%),
    linear-gradient(180deg, rgba(18,18,18,.35) 0%, rgba(18,18,18,0) 45%, rgba(18,18,18,.45) 100%);
}
.hero-inner { position: relative; z-index: 2; width: 100%; }
.hero-title {
  font-family: var(--serif);
  font-size: clamp(30px, 4.6vw, 56px);
  font-weight: 300;
  color: var(--ivory);
  letter-spacing: 0.05em;
  line-height: 1.5;
  margin: 20px 0 22px;
  text-shadow: 0 2px 24px rgba(0,0,0,.55);
}
.hero-sub { font-size: 15px; color: rgba(234,230,223,.82); letter-spacing: 0.06em; }
.hero .btn-line { margin-top: 34px; }

/* 小页首（内容页） */
.page-hero {
  padding: clamp(96px, 12vw, 150px) 0 clamp(36px, 5vw, 60px);
  background: var(--ink);
}
.page-hero .img-band {
  margin-top: clamp(28px, 4vw, 44px);
  height: clamp(200px, 32vw, 380px);
  overflow: hidden;
}
.page-hero .img-band img { width: 100%; height: 100%; object-fit: cover; }

/* ---------- 按钮 ---------- */
.btn-line {
  display: inline-block;
  padding: 13px 30px;
  border: 1px solid var(--gold);
  color: var(--gold);
  font-size: 12px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  transition: background .3s, color .3s;
}
.btn-line:hover { background: var(--gold); color: var(--ink); }
.btn-solid {
  display: inline-block;
  padding: 16px 44px;
  background: var(--gold);
  color: var(--ink);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.14em;
  border: none;
  cursor: pointer;
}
.btn-solid:hover { background: #c9a76a; }
.light .btn-line { border-color: #b39257; }

/* ---------- 品牌释义（首页） ---------- */
.brand-title {
  font-family: var(--serif);
  font-size: clamp(19px, 2.5vw, 27px);
  line-height: 1.9;
  color: #1a1a1b;
  margin: 18px 0 26px;
}
.brand-mark { font-family: var(--serif); font-size: clamp(22px, 3vw, 32px); letter-spacing: 0.12em; }
.brand-alias { font-size: 13px; letter-spacing: 0.3em; color: var(--gold); margin: 8px 0 30px; }
.brand-cols { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(24px, 4vw, 56px); margin: 44px 0; }
.col-t { font-size: 14px; letter-spacing: 0.16em; color: var(--gold); margin-bottom: 14px; }
.col .li, .col p { font-size: 15px; line-height: 1.95; color: rgba(28,28,28,.75); }
.brand-body p { font-size: 15px; line-height: 2; color: rgba(28,28,28,.74); margin-bottom: 16px; max-width: 760px; }

/* ---------- 三重价值 ---------- */
.pillars { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(20px, 3vw, 44px); margin-top: 40px; }
.pillar { border-top: 1px solid var(--line-gold); padding-top: 24px; }
.pnum { font-family: var(--serif); font-size: 13px; letter-spacing: 0.24em; color: var(--gold); }
.pn { font-family: var(--serif); font-size: clamp(18px, 2.2vw, 22px); margin: 12px 0 14px; }
.pd { font-size: 14.5px; line-height: 1.95; color: rgba(234,230,223,.62); }

/* ---------- 产品卡 ---------- */
.prod-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(18px, 2.6vw, 32px); margin: 36px 0 40px; }
.pg { display: block; }
.pg-img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; background: #1c1c1c; }
.pg-lead { font-size: 13.5px; line-height: 1.8; color: rgba(28,28,28,.6); margin: 8px 0 10px; }
.pg-tag { font-size: 11px; letter-spacing: 0.24em; color: var(--gold); margin-top: 16px; text-transform: uppercase; }
.pg-n { font-family: var(--serif); font-size: 19px; margin: 6px 0 4px; }
.pg-m { font-size: 12px; letter-spacing: 0.18em; color: rgba(28,28,28,.45); }
.dark .pg-m { color: rgba(234,230,223,.45); }

/* 产品大卡（产品页） */
.plist { display: flex; flex-direction: column; gap: clamp(48px, 7vw, 88px); }
.pcard + .pcard { padding-top: clamp(48px, 7vw, 88px); border-top: 1px solid rgba(234,230,223,.09); }
.pcard { display: grid; grid-template-columns: 1.1fr 1fr; gap: clamp(24px, 4vw, 56px); align-items: center; }
.pcard:nth-child(even) .pcard-img { order: 2; }
.pcard-img img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; background: #1c1c1c; }
.hls { display: flex; flex-wrap: wrap; gap: 0; margin: 20px 0 24px; border-top: 1px solid rgba(234,230,223,.1); }
.hl { display: flex; flex-direction: column; gap: 4px; padding: 14px 24px 14px 0; margin-right: 24px; border-right: 1px solid rgba(234,230,223,.08); }
.hl:last-child { border-right: none; margin-right: 0; padding-right: 0; }
.hk { font-size: 11px; letter-spacing: .1em; color: rgba(234,230,223,.4); }
.hv { font-size: 14.5px; color: var(--ivory); }
.card-meta { display: flex; gap: 16px; font-size: 11px; letter-spacing: 0.24em; color: var(--gold); text-transform: uppercase; }
.card-name { font-family: var(--serif); font-size: clamp(22px, 2.8vw, 30px); margin: 14px 0 6px; }
.card-line { font-size: 12px; letter-spacing: 0.2em; color: rgba(234,230,223,.45); text-transform: uppercase; }
.card-lead { font-size: 15px; line-height: 1.95; color: rgba(234,230,223,.72); margin: 18px 0 22px; }
.card-more { font-size: 12px; letter-spacing: 0.2em; color: var(--gold); }
.light .card-line { color: rgba(28,28,28,.45); }
.light .card-lead { color: rgba(28,28,28,.7); }

/* ---------- 双图 ---------- */
.duo { display: grid; grid-template-columns: 1fr 1fr; gap: 2px; }
.duo-item { position: relative; overflow: hidden; }
.duo-img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; }
.duo-mask { position: absolute; inset: 0; background: linear-gradient(180deg, rgba(0,0,0,0) 45%, rgba(0,0,0,.55) 100%); }
.duo-cap { position: absolute; left: 24px; bottom: 22px; font-size: 13px; letter-spacing: 0.1em; color: var(--ivory); }

/* ---------- 深入卡片 ---------- */
.dcards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: var(--line-dark); border: 1px solid var(--line-dark); margin-top: 36px; }
.dcard { background: var(--ink); padding: clamp(24px, 3vw, 36px); transition: background .3s; }
.dcard:hover { background: #222; }
.dc-t { font-size: 10.5px; letter-spacing: 0.34em; color: var(--gold); text-transform: uppercase; }
.dc-n { font-family: var(--serif); font-size: clamp(17px, 2vw, 21px); margin: 12px 0 10px; }
.dc-d { font-size: 14px; line-height: 1.9; color: rgba(234,230,223,.55); }
.dcard.wide { grid-column: 1 / -1; }

/* ---------- 章节头（内容页 01/02） ---------- */
.sec-h { display: flex; align-items: baseline; gap: 16px; }
.sec-n { font-family: var(--serif); font-size: 13px; letter-spacing: 0.2em; color: var(--gold); }
.sec-t { font-family: var(--serif); font-size: clamp(20px, 2.5vw, 26px); letter-spacing: 0.04em; }
.sec-e { font-size: 10.5px; letter-spacing: 0.3em; color: rgba(234,230,223,.32); text-transform: uppercase; margin: 10px 0 26px; }
.block + .block { margin-top: clamp(56px, 8vw, 88px); }
.stitle {
  font-family: var(--serif);
  font-size: clamp(19px, 2.2vw, 23px);
  letter-spacing: 0.06em;
  color: var(--gold);
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line-gold);
  margin-bottom: 26px;
}
.tdesc { font-size: 13.5px; color: rgba(234,230,223,.5); margin: -14px 0 24px; }

/* ---------- 步骤条 ---------- */
.steps { display: flex; flex-direction: column; }
.step { display: flex; gap: 18px; padding: 18px 0; border-bottom: 1px solid rgba(234,230,223,.08); }
.step:last-child { border-bottom: none; }
.num { font-family: var(--serif); font-size: 13px; letter-spacing: 0.1em; color: var(--gold); flex-shrink: 0; width: 34px; padding-top: 2px; }
.stxt { display: flex; flex-direction: column; gap: 5px; }
.sn { font-size: 15.5px; letter-spacing: 0.03em; color: var(--ivory); }
.sd { font-size: 13.5px; line-height: 1.85; color: rgba(234,230,223,.5); }
.light .sn { color: #1a1a1b; }
.light .sd { color: rgba(28,28,28,.55); }

/* ---------- 规范表 ---------- */
.rules { display: flex; flex-direction: column; }
.rule { display: flex; justify-content: space-between; align-items: baseline; gap: 20px; padding: 16px 0; border-bottom: 1px solid rgba(234,230,223,.08); }
.rk { font-size: 14.5px; color: rgba(234,230,223,.7); flex-shrink: 0; }
.rv { font-size: 14.5px; text-align: right; color: var(--ivory); }

/* ---------- 参数格 ---------- */
.grid { display: grid; grid-template-columns: repeat(2, 1fr); border-top: 1px solid var(--line-dark); border-left: 1px solid var(--line-dark); }
.cell { padding: 20px 22px; border-right: 1px solid var(--line-dark); border-bottom: 1px solid var(--line-dark); display: flex; flex-direction: column; gap: 6px; }
.k { font-size: 11.5px; letter-spacing: 0.12em; color: rgba(234,230,223,.45); }
.v { font-size: 15px; color: var(--ivory); }
.numrow { display: flex; align-items: baseline; gap: 6px; }
.numrow .v { font-family: var(--serif); font-size: clamp(34px, 5vw, 44px); color: var(--gold); }
.numrow .u { font-size: 14px; color: var(--gold); }

/* 参数行（带图标） */
.specs { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0 40px; }
.sp { display: flex; gap: 14px; padding: 16px 0; border-bottom: 1px solid var(--line-dark); align-items: flex-start; }
.sp-ic { width: 20px; height: 20px; opacity: .55; flex-shrink: 0; margin-top: 3px; }
.sp-tx { display: flex; flex-direction: column; gap: 3px; }
.sp-k { font-size: 11.5px; letter-spacing: 0.1em; color: rgba(234,230,223,.45); }
.sp-v { font-size: 15px; }

/* 参数卡（规格页） */
.card-h { display: flex; align-items: baseline; gap: 12px; margin-bottom: 8px; }
.cn { font-family: var(--serif); font-size: 12px; letter-spacing: 0.2em; color: var(--gold); }
.ct { font-family: var(--serif); font-size: 18px; }
.row { display: flex; justify-content: space-between; gap: 24px; padding: 13px 0; border-bottom: 1px solid rgba(234,230,223,.08); }
.row .k { font-size: 13.5px; letter-spacing: 0; color: rgba(234,230,223,.6); }
.row .v { font-size: 14px; text-align: right; }
.scard { border: 1px solid var(--line-dark); padding: clamp(22px, 3vw, 32px); }

/* ---------- 双列说明卡 ---------- */
.two { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.inst { background: linear-gradient(135deg, #242424 0%, #161616 100%); border: 1px solid var(--line-gold); padding: 26px 24px; }
.it { font-family: var(--serif); font-size: 17px; letter-spacing: 0.08em; color: var(--gold); }
.id { font-size: 14px; line-height: 1.9; color: rgba(234,230,223,.6); margin-top: 10px; }

/* ---------- 烟道链路 ---------- */
.chain { display: flex; flex-wrap: wrap; gap: 10px 8px; align-items: center; margin: 8px 0 20px; }
.ch { font-size: 13.5px; padding: 7px 14px; border: 1px solid var(--line-gold); color: var(--ivory); }
.ca { font-size: 12px; color: var(--gold); }

/* ---------- 知识页 ---------- */
.toc { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line-dark); border: 1px solid var(--line-dark); margin: 36px 0 0; }
.toc-i { background: var(--ink); padding: 20px 18px; display: flex; flex-direction: column; gap: 8px; transition: background .3s; }
.toc-i:hover { background: #222; }
.toc-n { font-family: var(--serif); font-size: 12px; letter-spacing: 0.2em; color: var(--gold); }
.toc-t { font-size: 15px; }
.item { padding: 22px 0; border-bottom: 1px solid rgba(234,230,223,.08); }
.item:last-child { border-bottom: none; }
.item .it { font-family: var(--serif); font-size: 17px; color: var(--gold); letter-spacing: 0.04em; margin-bottom: 10px; }
.item .q { font-size: 16px; color: var(--ivory); margin-bottom: 10px; }
.item .p { font-size: 14.5px; line-height: 1.95; color: rgba(234,230,223,.66); }
.foot-note { border-top: 1px solid var(--line-gold); padding-top: 26px; margin-top: 56px; }
.foot-note p { font-size: 13px; color: rgba(234,230,223,.42); line-height: 1.9; }

/* ---------- 型号切换 tab ---------- */
.tabs { display: flex; gap: 1px; background: var(--line-dark); border: 1px solid var(--line-dark); margin: 32px 0 40px; }
.tab { flex: 1; background: var(--ink); padding: 16px 18px; cursor: pointer; border: none; text-align: left; color: rgba(234,230,223,.6); font-family: var(--sans); transition: background .25s, color .25s; }
.tab .tn { display: block; font-size: 14.5px; letter-spacing: .03em; }
.tab .tm { display: block; font-size: 11px; letter-spacing: .2em; color: rgba(234,230,223,.35); margin-top: 4px; }
.tab.on { background: #242424; color: var(--ivory); }
.tab.on .tm { color: var(--gold); }
.panel { display: none; }
.panel.on { display: block; }
.panel-head { display: flex; align-items: baseline; gap: 14px; margin-bottom: 24px; }
.panel-head .pid { font-family: var(--serif); letter-spacing: .16em; color: var(--gold); font-size: 14px; }
.panel-head .pname { font-family: var(--serif); font-size: clamp(20px, 2.4vw, 26px); }

/* ---------- 页脚 ---------- */
.footer { background: var(--ink); border-top: 1px solid rgba(234,230,223,.08); padding: clamp(48px, 6vw, 72px) 0 clamp(32px, 4vw, 48px); }
.footer .fmark img { height: 24px; width: auto; opacity: .92; }
.footer .fslogan { font-family: var(--serif); font-size: 15px; color: rgba(234,230,223,.5); margin: 18px 0 22px; }
.footer .navrow { display: flex; flex-wrap: wrap; gap: 10px 28px; margin-bottom: 28px; }
.footer .navrow a { font-size: 12.5px; letter-spacing: .1em; color: rgba(234,230,223,.55); }
.footer .navrow a:hover { color: var(--gold); }
.footer .fcopy { font-size: 11.5px; letter-spacing: .16em; color: rgba(234,230,223,.3); }

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .brand-cols, .pillars, .prod-grid, .duo, .specs, .two, .toc, .dcards { grid-template-columns: 1fr; }
  .dcards { background: none; border: none; gap: 1px; }
  .pcard { grid-template-columns: 1fr; }
  .pcard:nth-child(even) .pcard-img { order: 0; }
  .grid { grid-template-columns: 1fr; }
  .tabs { flex-direction: column; }
  .nav { padding: 0 14px; height: 58px; }
  .nav .brand img { height: 18px; }
  .nav .links { flex: 1; min-width: 0; justify-content: flex-end; gap: 11px; letter-spacing: 0; }
  .nav .links a { font-size: 11.5px; letter-spacing: 0.02em; white-space: nowrap; }
  .hero { height: 70vh; }
}

/* 产品详情页首：左文右图（避免小图放大） */
.hero.split {
  display: block;
  height: auto;
  min-height: min(76vh, 700px);
  padding: 96px 0 0;
  background: #1c1c1c;
}
.hero.split .hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(20px, 4vw, 56px);
  align-items: center;
  min-height: calc(min(76vh, 700px) - 96px);
}
.hero.split img.prod {
  width: 100%;
  max-height: 58vh;
  object-fit: contain;
  background: transparent;
}
@media (max-width: 900px) {
  .hero.split { padding-top: 84px; }
  .hero.split .hero-grid { grid-template-columns: 1fr; min-height: 0; }
  .hero.split img.prod { max-height: 46vh; order: -1; }
}

/* 图示类大图：留白内嵌，不裁切 */
.page-hero .img-band.contain { background: #161616; display: flex; align-items: center; justify-content: center; }
.page-hero .img-band.contain img { width: 100%; height: 100%; object-fit: contain; }

/* 产品图深底融合：去掉照片自带浅底方块 */
/* 产品图已去底（*-cut.png），无需混合模式 */

/* ==========================================================================
   v2 · 编辑式官网（2026-11-06 去电商化重排）
   原则：不要卡片、不要按钮块、不要卖点三栏；用章节编号、细线行式清单、
   整幅摄影 + 双栏文字、真表格承载参数。
   ========================================================================== */

/* ---------- 首屏视频 ---------- */
.hero-video {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  background: var(--ink);
}
.hero { align-items: flex-end; }
.hero .hero-inner { padding-bottom: clamp(48px, 9vh, 104px); }

/* ---------- 导航：当前页用细下划线 ---------- */
.nav .links a.on {
  color: var(--ivory);
  border-bottom: 1px solid var(--gold);
  padding-bottom: 5px;
}

/* ---------- 按钮一律降级为文字链接 ---------- */
.btn-line, .btn-solid {
  display: inline-block;
  padding: 0 0 7px;
  border: none;
  border-bottom: 1px solid var(--line-gold);
  background: none;
  color: var(--gold);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  transition: color .25s, border-color .25s;
}
.btn-line:hover, .btn-solid:hover {
  background: none;
  color: var(--ivory);
  border-color: rgba(234, 230, 223, .45);
}
.light .btn-line:hover, .light .btn-solid:hover { color: #1a1a1b; border-color: rgba(28,28,28,.4); }
.light .btn-line { border-color: var(--line-gold); }

/* ---------- 章节头：左编号，右标题 ---------- */
.chapter {
  display: grid;
  grid-template-columns: clamp(56px, 11vw, 132px) 1fr;
  gap: clamp(18px, 4vw, 56px);
  align-items: start;
  margin-bottom: clamp(26px, 3.6vw, 44px);
}
.ch-num {
  font-family: var(--serif);
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--gold);
  padding-top: 10px;
}
.ch-en { font-size: 10.5px; letter-spacing: 0.4em; text-transform: uppercase; color: rgba(234, 230, 223, .34); }
.light .ch-en { color: rgba(28, 28, 28, .38); }
.ch-t {
  font-family: var(--serif);
  font-weight: 300;
  font-size: clamp(21px, 2.6vw, 30px);
  letter-spacing: 0.05em;
  line-height: 1.6;
  margin-top: 10px;
}

/* ---------- 细线行式清单 ---------- */
.ruled { border-top: 1px solid var(--line-dark); margin-top: clamp(24px, 3.6vw, 40px); }
.ruled-i {
  display: grid;
  grid-template-columns: clamp(44px, 6vw, 84px) 1fr;
  gap: clamp(14px, 3vw, 40px);
  padding: clamp(22px, 3.2vw, 34px) 0;
  border-bottom: 1px solid var(--line-dark);
  transition: color .25s;
}
.ruled-n { font-family: var(--serif); font-size: 12px; letter-spacing: 0.22em; color: var(--gold); padding-top: 7px; }
.ruled-t { font-family: var(--serif); font-weight: 300; font-size: clamp(17px, 2vw, 21px); letter-spacing: 0.04em; }
.ruled-d { font-size: 14.5px; line-height: 2; color: rgba(234, 230, 223, .62); margin-top: 10px; max-width: 60ch; }
.light .ruled { border-top-color: var(--line-ink); }
.light .ruled-i { border-bottom-color: var(--line-ink); }
.light .ruled-t { color: #1a1a1b; }
.light .ruled-d { color: rgba(28, 28, 28, .66); }
a.ruled-i:hover .ruled-t { color: var(--gold); }

/* ---------- 产品逐款（图 + 双栏信息，无卡片） ---------- */
.plines { display: flex; flex-direction: column; }
.pline {
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
  gap: clamp(22px, 4.4vw, 64px);
  align-items: center;
}
.pline + .pline {
  margin-top: clamp(44px, 7vw, 88px);
  padding-top: clamp(44px, 7vw, 88px);
  border-top: 1px solid var(--line-dark);
}
.pline-img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; background: #1c1c1c; }
.pline-model { font-size: 10.5px; letter-spacing: 0.34em; color: var(--gold); text-transform: uppercase; }
.pline-name {
  font-family: var(--serif);
  font-weight: 300;
  font-size: clamp(22px, 2.6vw, 30px);
  letter-spacing: 0.05em;
  margin: 12px 0;
}
.pline-lead { font-size: 14.5px; line-height: 2; color: rgba(234, 230, 223, .66); max-width: 44ch; }
.pline-dl { margin-top: 24px; border-top: 1px solid var(--line-dark); }
.pline-dl .dr {
  display: grid;
  grid-template-columns: minmax(78px, 116px) 1fr;
  gap: 14px;
  padding: 11px 0;
  border-bottom: 1px solid rgba(234, 230, 223, .07);
}
.pline-dl .dk { font-size: 11.5px; letter-spacing: 0.1em; color: rgba(234, 230, 223, .4); }
.pline-dl .dv { font-size: 13.5px; color: var(--ivory); font-variant-numeric: tabular-nums; }
.pline-more { margin-top: 26px; }
.light .pline-lead { color: rgba(28, 28, 28, .68); }
.light .pline + .pline { border-top-color: var(--line-ink); }
.light .pline-dl { border-top-color: var(--line-ink); }
.light .pline-dl .dr { border-bottom-color: rgba(28, 28, 28, .08); }
.light .pline-dl .dk { color: rgba(28, 28, 28, .46); }
.light .pline-dl .dv { color: #1a1a1b; }

/* ---------- 真表格（参数） ---------- */
.sptable { width: 100%; border-collapse: collapse; font-size: 13.5px; margin-top: 10px; }
.sptable caption {
  text-align: left;
  font-family: var(--serif);
  font-size: 15px;
  color: var(--ivory);
  letter-spacing: 0.06em;
  padding: 0 0 14px;
}
.sptable th, .sptable td {
  text-align: left;
  padding: 12px 18px 12px 0;
  border-bottom: 1px solid rgba(234, 230, 223, .08);
  vertical-align: top;
}
.sptable th { font-weight: 400; width: 40%; font-size: 12px; letter-spacing: 0.08em; color: rgba(234, 230, 223, .42); }
.sptable td { color: var(--ivory); font-variant-numeric: tabular-nums; }
.sptable tr:first-child th, .sptable tr:first-child td { border-top: 1px solid rgba(234, 230, 223, .16); }

/* ---------- 服务：定义式数字 ---------- */
.dl-nums { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(22px, 4vw, 56px); margin-top: 8px; }
.dl-num { border-top: 1px solid var(--line-gold); padding-top: 22px; }
.dl-num .v { font-family: var(--serif); font-size: clamp(28px, 3.4vw, 40px); color: var(--ivory); letter-spacing: 0.02em; }
.dl-num .v span { font-size: 14px; color: rgba(234, 230, 223, .55); margin-left: 8px; letter-spacing: 0.1em; }
.dl-num .k { display: block; font-size: 11.5px; letter-spacing: 0.2em; color: var(--gold); text-transform: uppercase; margin-top: 12px; }

/* ---------- 步骤：细线化 ---------- */
.steps .step { border-top: 1px solid rgba(234, 230, 223, .08); }

/* ---------- 移动端 ---------- */
@media (max-width: 900px) {
  .chapter { grid-template-columns: 1fr; gap: 10px; }
  .ch-num { padding-top: 0; }
  .pline { grid-template-columns: 1fr; gap: 20px; }
  .dl-nums { grid-template-columns: 1fr; }
  .ruled-i { grid-template-columns: 40px 1fr; gap: 14px; }
  .sptable th { width: 46%; }
}

/* ---------- 卡片类元素统一素化 ---------- */
.two { gap: clamp(24px, 4vw, 64px); border-top: 1px solid var(--line-dark); padding-top: clamp(22px, 3vw, 30px); margin-top: 6px; }
.inst { background: none; border: none; padding: 0; }
.inst .it { font-size: 16px; color: var(--ivory); letter-spacing: 0.06em; }
.inst .id { font-size: 14px; line-height: 1.95; color: rgba(234, 230, 223, .58); margin-top: 10px; }

.scard { border: none; padding: 0; margin-bottom: clamp(30px, 4vw, 46px); }

.toc { background: none; border: none; border-top: 1px solid var(--line-dark); border-bottom: 1px solid var(--line-dark); grid-template-columns: repeat(4, 1fr); gap: 0; margin-top: clamp(28px, 4vw, 44px); }
.toc-i { background: none; padding: 24px 0; gap: 10px; }
.toc-i:hover { background: none; color: var(--gold); }
.toc-t { font-family: var(--serif); font-weight: 300; font-size: 17px; }

.tabs { background: none; border: none; border-bottom: 1px solid var(--line-dark); gap: clamp(18px, 3vw, 44px); margin: clamp(28px, 4vw, 40px) 0 clamp(28px, 4vw, 44px); }
.tab { flex: 0 0 auto; background: none; padding: 0 0 14px; color: rgba(234, 230, 223, .45); }
.tab.on { background: none; color: var(--ivory); border-bottom: 1px solid var(--gold); }
.tab .tm { letter-spacing: 0.22em; }

/* 概览双栏（详情页） */
.ov { display: grid; grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr); gap: clamp(26px, 5vw, 72px); align-items: start; }
.ov-lead { font-family: var(--serif); font-weight: 300; font-size: clamp(17px, 1.9vw, 20px); line-height: 2.05; color: rgba(234, 230, 223, .92); }
.ov-desc { font-size: 14.5px; line-height: 2; color: rgba(234, 230, 223, .62); margin-top: 18px; }
@media (max-width: 900px) { .ov { grid-template-columns: 1fr; } .toc { grid-template-columns: repeat(2, 1fr); } }

/* ---------- 章节头 v2：左对齐 ---------- */
.chapter { display: block; margin-bottom: clamp(20px, 3vw, 32px); }
.ch-head { display: flex; align-items: center; gap: 16px; }
.ch-head .ch-num { font-family: var(--sans); font-size: 11px; letter-spacing: 0.26em; color: var(--gold); padding-top: 0; }
.chapter .ch-t { margin-top: clamp(12px, 1.6vw, 16px); }

/* ---------- 品牌段收紧 ---------- */
.brand-title {
  font-size: clamp(19px, 2.2vw, 25px);
  line-height: 2;
  max-width: 26em;
  margin: clamp(20px, 3vw, 28px) 0 clamp(16px, 2.4vw, 22px);
  color: #1a1a1b;
}
.brand-mark { font-family: var(--serif); font-size: clamp(15px, 1.5vw, 17px); letter-spacing: 0.26em; color: rgba(28, 28, 28, .78); }
.brand-alias { font-size: 10.5px; letter-spacing: 0.32em; color: var(--gold); margin: 10px 0 clamp(22px, 3vw, 30px); }
.brand-body p { max-width: 40em; }
.brand-cols {
  border-top: 1px solid var(--line-ink);
  padding-top: clamp(20px, 2.6vw, 26px);
  margin: clamp(26px, 3.6vw, 38px) 0;
  gap: clamp(28px, 5vw, 72px);
}
.brand-cols .col-t { font-size: 11.5px; letter-spacing: 0.22em; margin-bottom: 12px; }

/* ---------- 宽幅场景图 ---------- */
.wide { margin: 0; }
.wide img { width: 100%; aspect-ratio: 21 / 9; object-fit: cover; }
.wide figcaption {
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: rgba(234, 230, 223, .42);
  padding: 14px clamp(20px, 4vw, 48px) 0;
  max-width: var(--max);
  margin: 0 auto;
}
@media (max-width: 900px) { .wide img { aspect-ratio: 3 / 2; } }

/* 浅底文字链接更沉一点 */
.light .btn-line, .light .btn-solid { color: #8a6b39; }

/* ---------- 节奏收紧 ---------- */
.sec { padding: clamp(56px, 7vw, 92px) 0; }
.block + .block { margin-top: clamp(44px, 6vw, 72px); }
.pline + .pline { margin-top: clamp(40px, 5.4vw, 68px); padding-top: clamp(40px, 5.4vw, 68px); }
.two.three { grid-template-columns: repeat(3, 1fr); gap: clamp(20px, 3vw, 44px); }
@media (max-width: 900px) { .two.three { grid-template-columns: 1fr; } }

/* 详情页首屏：图文比例更均衡 */
.hero.split .hero-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1.12fr); }
.hero.split img.prod { max-height: 62vh; }
@media (max-width: 900px) { .hero.split .hero-grid { grid-template-columns: 1fr; } }

/* ---------- 图纸版（白底示意图放在米白纸面上） ---------- */
.diagram { margin: 0 0 clamp(22px, 3vw, 32px); background: var(--paper); padding: clamp(18px, 2.4vw, 30px); max-width: 780px; }
.diagram img { width: 100%; height: auto; }
.diagram figcaption { font-size: 11.5px; letter-spacing: 0.14em; color: rgba(28, 28, 28, .5); padding-top: 14px; }

/* ---------- 正文行宽（可读性） ---------- */
.item .p, .lead, .note, .ruled-d, .sd, .inst .id { max-width: 46em; }