/* ==========================================================================
   千嘉木业 · 设计系统
   Qianjia Wood · Design System
   ========================================================================== */

:root {
  /* 配色 */
  --c-ink: #3A2E27;
  --c-ink-deep: #2A211C;
  --c-gold: #B4864B;
  --c-gold-light: #D2A96E;
  --c-sand: #F6F1E9;
  --c-sand-deep: #EFE7DA;
  --c-white: #FFFFFF;
  --c-text: #2C2A28;
  --c-muted: #7A7269;
  --c-muted-light: #A29A90;
  --c-line: #E5DED3;
  --c-green: #3F5D4B;

  /* 字体 */
  --f-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", serif;
  --f-sans: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --f-num: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;

  /* 布局 */
  --w-max: 1240px;
  --w-narrow: 860px;
  --gap: 24px;
  --sec-y: 96px;
  --sec-y-sm: 56px;
  --r-sm: 4px;
  --r-md: 8px;
  --r-lg: 12px;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--f-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--c-text);
  background: var(--c-white);
  -webkit-font-smoothing: antialiased;
}
img, svg { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4 { margin: 0; font-weight: 500; line-height: 1.35; }
p { margin: 0; }
button { font: inherit; cursor: pointer; border: none; background: none; color: inherit; }
input, textarea, select { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--c-gold); outline-offset: 3px; }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* ---------- 排版 ---------- */
.h-serif { font-family: var(--f-serif); font-weight: 500; letter-spacing: .01em; }
.h1 { font-family: var(--f-serif); font-size: 48px; line-height: 1.25; }
.h2 { font-family: var(--f-serif); font-size: 34px; line-height: 1.3; }
.h3 { font-family: var(--f-serif); font-size: 22px; line-height: 1.4; }
.h4 { font-size: 17px; font-weight: 500; }
.lead { font-size: 17px; line-height: 1.85; color: var(--c-muted); }
.small { font-size: 13px; color: var(--c-muted); }
.num { font-family: var(--f-num); font-variant-numeric: tabular-nums; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font-size: 13px; letter-spacing: .18em; text-transform: uppercase;
  color: var(--c-gold); font-family: var(--f-num); font-weight: 500;
}
.eyebrow::before { content: ""; width: 28px; height: 1px; background: var(--c-gold); }

/* ---------- 布局 ---------- */
.wrap { width: 100%; max-width: var(--w-max); margin: 0 auto; padding: 0 32px; }
.wrap-narrow { width: 100%; max-width: var(--w-narrow); margin: 0 auto; padding: 0 32px; }
.sec { padding: var(--sec-y) 0; }
.sec-sand { background: var(--c-sand); }
.sec-ink { background: var(--c-ink); color: #EDE7DF; }
.sec-ink .lead, .sec-ink .small { color: #B9AFA4; }
.sec-ink .h2, .sec-ink .h3, .sec-ink .h4 { color: #F4EFE8; }

.sec-head { max-width: 720px; margin-bottom: 56px; }
.sec-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.sec-head .h2 { margin: 18px 0 16px; }
.sec-head.center .eyebrow { justify-content: center; }

.grid { display: grid; gap: var(--gap); }
.g2 { grid-template-columns: repeat(2, 1fr); }
.g3 { grid-template-columns: repeat(3, 1fr); }
.g4 { grid-template-columns: repeat(4, 1fr); }
.g-2-1 { grid-template-columns: 1.35fr 1fr; }
.g-1-2 { grid-template-columns: 1fr 1.35fr; }
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 14px 28px; border-radius: var(--r-sm);
  font-size: 15px; font-weight: 500; letter-spacing: .02em;
  transition: background-color .22s, color .22s, border-color .22s, transform .22s;
  white-space: nowrap;
}
.btn-gold { background: var(--c-gold); color: #fff; }
.btn-gold:hover { background: #A2763D; }
.btn-ink { background: var(--c-ink); color: #F4EFE8; }
.btn-ink:hover { background: var(--c-ink-deep); }
.btn-line { border: 1px solid rgba(255,255,255,.45); color: #fff; }
.btn-line:hover { background: rgba(255,255,255,.12); border-color: #fff; }
.btn-outline { border: 1px solid var(--c-line); color: var(--c-text); }
.btn-outline:hover { border-color: var(--c-gold); color: var(--c-gold); }
.btn-sm { padding: 10px 20px; font-size: 14px; }
.btn-row { display: flex; flex-wrap: wrap; gap: 14px; }
.link-more {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 14px; color: var(--c-gold); font-weight: 500;
  border-bottom: 1px solid transparent; transition: border-color .2s;
}
.link-more:hover { border-bottom-color: var(--c-gold); }
.link-more::after { content: "\2192"; transition: transform .2s; }
.link-more:hover::after { transform: translateX(4px); }

/* ---------- 顶部导航 ---------- */
.topbar {
  background: var(--c-ink); color: #B9AFA4; font-size: 13px;
  border-bottom: 1px solid rgba(255,255,255,.08);
}
.topbar .wrap { display: flex; justify-content: space-between; align-items: center; height: 38px; }
.topbar a:hover { color: var(--c-gold-light); }
.topbar-l, .topbar-r { display: flex; align-items: center; gap: 22px; }

.hd {
  position: sticky; top: 0; z-index: 60;
  background: rgba(255,255,255,.92); backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--c-line);
}
.hd-in { display: flex; align-items: center; justify-content: space-between; height: 78px; gap: 32px; }
.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark {
  width: 40px; height: 40px; border-radius: 6px; flex: none;
  background: var(--c-ink); color: var(--c-gold-light);
  display: grid; place-items: center;
  font-family: var(--f-serif); font-size: 20px;
}
.brand-txt { display: flex; flex-direction: column; line-height: 1.2; }
.brand-txt b { font-family: var(--f-serif); font-size: 19px; font-weight: 500; letter-spacing: .04em; }
.brand-txt span { font-size: 11px; color: var(--c-muted-light); letter-spacing: .12em; font-family: var(--f-num); white-space: nowrap; }

.nav { display: flex; align-items: center; gap: 4px; }
.nav > li { position: relative; }
.nav > li > a {
  display: block; padding: 10px 15px; font-size: 15px; border-radius: var(--r-sm);
  white-space: nowrap;
  transition: color .2s, background-color .2s;
}
.nav > li > a:hover, .nav > li.on > a { color: var(--c-gold); }
.nav-sub {
  position: absolute; top: calc(100% + 6px); left: 0; min-width: 190px;
  background: #fff; border: 1px solid var(--c-line); border-radius: var(--r-md);
  padding: 8px; opacity: 0; visibility: hidden; transform: translateY(-6px);
  transition: opacity .2s, transform .2s, visibility .2s;
  box-shadow: 0 12px 32px rgba(58,46,39,.10);
}
.nav > li:hover .nav-sub { opacity: 1; visibility: visible; transform: translateY(0); }
.nav-sub a { display: block; padding: 9px 14px; font-size: 14px; border-radius: var(--r-sm); color: var(--c-muted); }
.nav-sub a:hover { background: var(--c-sand); color: var(--c-ink); }
.nav-sub a.on { color: var(--c-gold); }

.hd-act { display: flex; align-items: center; gap: 14px; flex: none; }
.lang {
  font-size: 13px; font-family: var(--f-num); letter-spacing: .06em;
  border: 1px solid var(--c-line); border-radius: var(--r-sm); padding: 7px 12px;
  color: var(--c-muted); transition: border-color .2s, color .2s;
}
.lang:hover { border-color: var(--c-gold); color: var(--c-gold); }
.burger { display: none; width: 42px; height: 42px; place-items: center; border: 1px solid var(--c-line); border-radius: var(--r-sm); }
.burger span { display: block; width: 18px; height: 1.5px; background: var(--c-ink); position: relative; }
.burger span::before, .burger span::after { content: ""; position: absolute; left: 0; width: 18px; height: 1.5px; background: var(--c-ink); }
.burger span::before { top: -6px; } .burger span::after { top: 6px; }

/* 移动端抽屉 */
.drawer {
  position: fixed; inset: 0; z-index: 90; background: #fff;
  transform: translateX(100%); transition: transform .3s ease;
  display: flex; flex-direction: column; overflow-y: auto;
}
.drawer.open { transform: translateX(0); }
.drawer-top { display: flex; align-items: center; justify-content: space-between; padding: 16px 24px; border-bottom: 1px solid var(--c-line); }
.drawer-close { width: 40px; height: 40px; display: grid; place-items: center; font-size: 24px; color: var(--c-muted); }
.drawer-nav { padding: 12px 24px 40px; }
.drawer-nav a { display: block; padding: 15px 0; font-size: 17px; border-bottom: 1px solid var(--c-line); }
.drawer-nav .sub a { padding: 11px 0 11px 18px; font-size: 15px; color: var(--c-muted); border-bottom: none; }
.drawer-cta { padding: 0 24px 40px; display: grid; gap: 12px; }

/* ---------- 首页首屏 ---------- */
.hero { position: relative; min-height: 620px; display: flex; align-items: center; background: var(--c-ink); overflow: hidden; }
.hero-bg { position: absolute; inset: 0; }
.hero-bg .ph { width: 100%; height: 100%; }
.hero::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(90deg, rgba(42,33,28,.88) 0%, rgba(42,33,28,.62) 48%, rgba(42,33,28,.30) 100%);
}
.hero-in { position: relative; z-index: 2; padding-top: 110px; padding-bottom: 110px; width: 100%; }
.hero h1 { color: #fff; max-width: 15em; }
.hero h1 em { font-style: normal; color: var(--c-gold-light); }
.hero p { color: #CFC6BB; max-width: 34em; margin: 22px 0 34px; font-size: 17px; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 34px; }
.hero-tags span {
  font-size: 13px; color: #D9D0C4; padding: 6px 14px;
  border: 1px solid rgba(255,255,255,.22); border-radius: 999px;
}

/* ---------- 内页头图 ---------- */
.pagehead { background: var(--c-ink); padding: 76px 0 68px; position: relative; overflow: hidden; }
.pagehead::after {
  content: ""; position: absolute; inset: 0;
  background-image: repeating-linear-gradient(94deg, rgba(180,134,75,.07) 0 1px, transparent 1px 13px);
}
.pagehead-in { position: relative; z-index: 2; }
.pagehead h1 { color: #fff; font-family: var(--f-serif); font-size: 38px; }
.pagehead p { color: #B9AFA4; margin-top: 14px; max-width: 46em; }
.crumb { display: flex; flex-wrap: wrap; gap: 8px; font-size: 13px; color: #9A9086; margin-bottom: 20px; }
.crumb a:hover { color: var(--c-gold-light); }
.crumb i { font-style: normal; color: #6B625A; }

/* ---------- 数据条 ---------- */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--c-line); }
.stat { padding: 40px 28px; border-right: 1px solid var(--c-line); }
.stat:last-child { border-right: none; }
.stat b { display: block; font-family: var(--f-num); font-size: 42px; font-weight: 500; color: var(--c-gold); line-height: 1.1; }
.stat b i { font-style: normal; font-size: 20px; margin-left: 2px; }
.stat span { display: block; margin-top: 10px; font-size: 14px; color: var(--c-muted); }

/* ---------- 卡片 ---------- */
.card {
  background: #fff; border: 1px solid var(--c-line); border-radius: var(--r-md);
  overflow: hidden; display: flex; flex-direction: column;
  transition: border-color .25s, transform .25s, box-shadow .25s;
}
.card:hover { border-color: var(--c-gold); transform: translateY(-3px); box-shadow: 0 14px 34px rgba(58,46,39,.09); }
.card-body { padding: 24px; display: flex; flex-direction: column; flex: 1; }
.card-body h3 { font-family: var(--f-serif); font-size: 19px; margin-bottom: 10px; }
.card-body p { font-size: 14px; color: var(--c-muted); line-height: 1.75; }
.card-foot { margin-top: auto; padding-top: 18px; }
.tags { display: flex; flex-wrap: wrap; gap: 7px; margin-bottom: 14px; }
.tag {
  font-size: 12px; padding: 3px 10px; border-radius: 999px;
  background: var(--c-sand); color: #8C7B63; border: 1px solid var(--c-line);
}
.tag-green { background: rgba(63,93,75,.08); color: var(--c-green); border-color: rgba(63,93,75,.2); }
.tag-gold { background: rgba(180,134,75,.1); color: #8E6733; border-color: rgba(180,134,75,.28); }

/* 特色条目（为什么选千嘉） */
.feat { padding: 30px 28px; background: #fff; border: 1px solid var(--c-line); border-radius: var(--r-md); }
.feat-ico {
  width: 44px; height: 44px; border-radius: var(--r-sm); background: var(--c-sand);
  display: grid; place-items: center; margin-bottom: 20px; color: var(--c-gold);
}
.feat h3 { font-family: var(--f-serif); font-size: 18px; margin-bottom: 10px; }
.feat p { font-size: 14px; color: var(--c-muted); line-height: 1.75; }

/* 客群分流 */
.aud { position: relative; border-radius: var(--r-md); overflow: hidden; min-height: 320px; display: flex; align-items: flex-end; }
.aud .ph { position: absolute; inset: 0; }
.aud::after { content: ""; position: absolute; inset: 0; background: linear-gradient(0deg, rgba(42,33,28,.9) 0%, rgba(42,33,28,.35) 60%, rgba(42,33,28,.15) 100%); }
.aud-in { position: relative; z-index: 2; padding: 30px; }
.aud-in h3 { color: #fff; font-family: var(--f-serif); font-size: 20px; margin-bottom: 8px; }
.aud-in p { color: #C4BAB0; font-size: 14px; margin-bottom: 16px; }
.aud-in .link-more { color: var(--c-gold-light); }

/* ---------- 工艺流程 ---------- */
.flow { display: grid; grid-template-columns: repeat(6, 1fr); border-top: 1px solid rgba(255,255,255,.15); }
.flow-i { padding: 30px 20px 30px 0; position: relative; }
.flow-i::before {
  content: ""; position: absolute; top: -1px; left: 0; width: 34px; height: 2px; background: var(--c-gold);
}
.flow-i b { display: block; font-family: var(--f-num); font-size: 13px; color: var(--c-gold); letter-spacing: .1em; margin-bottom: 14px; }
.flow-i h4 { color: #F4EFE8; font-size: 16px; margin-bottom: 8px; }
.flow-i p { font-size: 13px; color: #9A9086; line-height: 1.7; }

/* ---------- 产品筛选 ---------- */
.filter { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 36px; }
.filter button {
  padding: 9px 20px; font-size: 14px; border: 1px solid var(--c-line);
  border-radius: 999px; color: var(--c-muted); background: #fff;
  transition: all .2s;
}
.filter button:hover { border-color: var(--c-gold); color: var(--c-gold); }
.filter button.on { background: var(--c-ink); border-color: var(--c-ink); color: #fff; }

/* ---------- 参数表 ---------- */
.spec { width: 100%; border-collapse: collapse; font-size: 15px; }
.spec th, .spec td { padding: 14px 18px; border-bottom: 1px solid var(--c-line); text-align: left; vertical-align: top; }
.spec th { width: 180px; color: var(--c-muted); font-weight: 400; background: var(--c-sand); }
.spec tr:last-child th, .spec tr:last-child td { border-bottom: none; }

/* ---------- 清单列表 ---------- */
.checklist li { position: relative; padding-left: 30px; margin-bottom: 12px; font-size: 15px; color: var(--c-muted); }
.checklist li::before {
  content: ""; position: absolute; left: 0; top: 9px; width: 14px; height: 8px;
  border-left: 1.5px solid var(--c-gold); border-bottom: 1.5px solid var(--c-gold);
  transform: rotate(-45deg);
}

/* ---------- 时间轴 ---------- */
.tl { border-left: 1px solid var(--c-line); padding-left: 32px; }
.tl-i { position: relative; padding-bottom: 38px; }
.tl-i:last-child { padding-bottom: 0; }
.tl-i::before {
  content: ""; position: absolute; left: -38px; top: 8px;
  width: 11px; height: 11px; border-radius: 50%; background: #fff;
  border: 2px solid var(--c-gold);
}
.tl-i b { font-family: var(--f-num); font-size: 14px; color: var(--c-gold); letter-spacing: .06em; }
.tl-i h4 { font-size: 17px; margin: 6px 0 6px; }
.tl-i p { font-size: 14px; color: var(--c-muted); }

/* ---------- 表单 ---------- */
.form { display: grid; gap: 18px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.field { display: flex; flex-direction: column; gap: 7px; }
.field label { font-size: 13px; color: var(--c-muted); }
.field label i { color: var(--c-gold); font-style: normal; }
.field input, .field textarea, .field select {
  padding: 12px 14px; border: 1px solid var(--c-line); border-radius: var(--r-sm);
  background: #fff; font-size: 15px; transition: border-color .2s;
  width: 100%; font-family: inherit;
}
.field input:focus, .field textarea:focus, .field select:focus { border-color: var(--c-gold); outline: none; }
.field textarea { resize: vertical; min-height: 118px; }
.form-note { font-size: 13px; color: var(--c-muted-light); }
.form-tabs { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 26px; }
.form-tabs button {
  padding: 10px 22px; font-size: 14px; border: 1px solid var(--c-line);
  border-radius: var(--r-sm); color: var(--c-muted); background: #fff;
}
.form-tabs button.on { background: var(--c-ink); border-color: var(--c-ink); color: #fff; }
.form-done {
  display: none; padding: 18px; border-radius: var(--r-sm);
  background: rgba(63,93,75,.08); border: 1px solid rgba(63,93,75,.24);
  color: var(--c-green); font-size: 15px;
}
.form-done.show { display: block; }

/* ---------- 信息块 ---------- */
.info-row { display: flex; gap: 18px; padding: 22px 0; border-bottom: 1px solid var(--c-line); }
.info-row:last-child { border-bottom: none; }
.info-ico {
  width: 40px; height: 40px; flex: none; border-radius: var(--r-sm);
  background: var(--c-sand); display: grid; place-items: center; color: var(--c-gold);
}
.info-row b { display: block; font-size: 14px; margin-bottom: 4px; }
.info-row p { font-size: 15px; color: var(--c-muted); }
.info-row a { color: var(--c-gold); }

/* ---------- 手风琴 ---------- */
.acc-i { border-bottom: 1px solid var(--c-line); }
.acc-q {
  width: 100%; text-align: left; padding: 22px 44px 22px 0; position: relative;
  font-size: 16px; font-weight: 500;
}
.acc-q::after {
  content: ""; position: absolute; right: 8px; top: 30px; width: 10px; height: 10px;
  border-right: 1.5px solid var(--c-gold); border-bottom: 1.5px solid var(--c-gold);
  transform: rotate(45deg); transition: transform .25s;
}
.acc-i.open .acc-q::after { transform: rotate(-135deg); }
.acc-a { max-height: 0; overflow: hidden; transition: max-height .3s ease; }
.acc-i.open .acc-a { max-height: 420px; }
.acc-a p { padding: 0 40px 24px 0; font-size: 15px; color: var(--c-muted); }

/* ---------- 占位图 ---------- */
.ph {
  position: relative; display: flex; align-items: center; justify-content: center;
  background-color: var(--c-sand-deep);
  background-image:
    repeating-linear-gradient(93deg, rgba(180,134,75,.11) 0 2px, transparent 2px 11px),
    repeating-linear-gradient(87deg, rgba(58,46,39,.045) 0 1px, transparent 1px 17px);
  overflow: hidden;
}
.ph::after {
  content: attr(data-label); font-size: 13px; color: #9C8A6F;
  letter-spacing: .06em; text-align: center; padding: 0 20px; line-height: 1.6;
}
.ph-nolabel::after { content: none; }
.ph-dark { background-color: #4A3C33; background-image: repeating-linear-gradient(93deg, rgba(210,169,110,.10) 0 2px, transparent 2px 12px); }
.ph-dark::after { color: #A8967C; }
.ph-tag {
  position: absolute; top: 12px; left: 12px; z-index: 3;
  font-size: 11px; letter-spacing: .04em; padding: 3px 9px; border-radius: 3px;
  background: rgba(255,255,255,.88); color: #8C7B63; border: 1px solid var(--c-line);
}
.r-21x9 { aspect-ratio: 21 / 9; }
.r-16x9 { aspect-ratio: 16 / 9; }
.r-4x3 { aspect-ratio: 4 / 3; }
.r-3x2 { aspect-ratio: 3 / 2; }
.r-1x1 { aspect-ratio: 1 / 1; }
.r-3x4 { aspect-ratio: 3 / 4; }
.h-fill { height: 100%; }

/* ---------- 页脚 ---------- */
.ft { background: var(--c-ink-deep); color: #9A9086; padding: 72px 0 0; font-size: 14px; }
.ft-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1.2fr; gap: 48px; padding-bottom: 56px; }
.ft h4 { color: #F4EFE8; font-size: 15px; margin-bottom: 20px; letter-spacing: .04em; }
.ft li { margin-bottom: 11px; }
.ft a:hover { color: var(--c-gold-light); }
.ft-brand { display: flex; align-items: center; gap: 12px; margin-bottom: 20px; }
.ft-brand .brand-mark { background: rgba(180,134,75,.16); }
.ft-brand b { font-family: var(--f-serif); font-size: 18px; color: #F4EFE8; }
.ft-desc { line-height: 1.85; max-width: 30em; }
.ft-qr { width: 108px; height: 108px; border: 1px solid rgba(255,255,255,.14); border-radius: var(--r-sm); display: grid; place-items: center; font-size: 12px; text-align: center; color: #7A7168; padding: 8px; }
.ft-bot {
  border-top: 1px solid rgba(255,255,255,.08); padding: 22px 0 26px;
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px;
  font-size: 13px; color: #7A7168;
}
.ft-bot a:hover { color: var(--c-gold-light); }
.ft-legal { display: flex; flex-wrap: wrap; gap: 18px; }

/* ---------- 悬浮与移动栏 ---------- */
.fab {
  position: fixed; right: 24px; bottom: 32px; z-index: 70;
  display: flex; flex-direction: column; gap: 10px;
}
.fab button, .fab a {
  width: 50px; height: 50px; border-radius: 50%; display: grid; place-items: center;
  background: #fff; border: 1px solid var(--c-line); color: var(--c-ink);
  box-shadow: 0 6px 20px rgba(58,46,39,.12); transition: all .22s;
}
.fab a:hover, .fab button:hover { background: var(--c-gold); border-color: var(--c-gold); color: #fff; }
.mbar { display: none; }

/* ---------- 动效 ---------- */
.rv { opacity: 0; transform: translateY(22px); transition: opacity .7s ease, transform .7s ease; }
.rv.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .rv { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 1199px) {
  .nav > li > a { padding: 10px 11px; font-size: 14px; }
  .split { gap: 44px; }
}
@media (max-width: 991px) {
  :root { --sec-y: 72px; }
  .nav, .hd-act .lang { display: none; }
  .burger { display: grid; }
  .g4 { grid-template-columns: repeat(2, 1fr); }
  .g3 { grid-template-columns: repeat(2, 1fr); }
  .split, .g-2-1, .g-1-2 { grid-template-columns: 1fr; gap: 40px; }
  .flow { grid-template-columns: repeat(3, 1fr); }
  .ft-grid { grid-template-columns: 1fr 1fr; gap: 36px; }
  .h1 { font-size: 38px; }
  .h2 { font-size: 29px; }
  .hero { min-height: 540px; }
}
@media (max-width: 767px) {
  :root { --sec-y: 56px; --gap: 16px; }
  .wrap, .wrap-narrow { padding: 0 20px; }
  html, body { overflow-x: hidden; }
  .topbar .wrap { height: auto; padding-top: 7px; padding-bottom: 7px; justify-content: center; }
  .topbar-l { display: none; }
  .topbar-r { gap: 16px; }
  .hd-in { height: 64px; gap: 12px; }
  .hd-act { gap: 8px; }
  .brand-mark { width: 36px; height: 36px; font-size: 18px; }
  .brand-txt b { font-size: 17px; }
  .brand-txt span { display: none; }
  .g2, .g3, .g4 { grid-template-columns: 1fr; }
  .flow { grid-template-columns: repeat(2, 1fr); }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .stat { padding: 28px 18px; border-bottom: 1px solid var(--c-line); }
  .stat b { font-size: 34px; }
  .stat:nth-child(2n) { border-right: none; }
  .ft-grid { grid-template-columns: 1fr; }
  .h1 { font-size: 30px; }
  .h2 { font-size: 24px; }
  .h3 { font-size: 19px; }
  .pagehead { padding: 48px 0 44px; }
  .pagehead h1 { font-size: 27px; }
  .hero { min-height: auto; }
  .hero-in { padding-top: 64px; padding-bottom: 64px; }
  .hero p { font-size: 15px; }
  .hero-tags span { font-size: 12px; padding: 5px 11px; }
  .form-row { grid-template-columns: 1fr; }
  .btn-row .btn { flex: 1 1 auto; }
  .fab { display: none; }
  .mbar {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px;
    position: fixed; left: 0; right: 0; bottom: 0; z-index: 80;
    background: var(--c-line); border-top: 1px solid var(--c-line);
  }
  .mbar a {
    background: #fff; padding: 13px 0; text-align: center; font-size: 13px;
    display: flex; align-items: center; justify-content: center; gap: 6px;
  }
  .mbar a:first-child { background: var(--c-gold); color: #fff; }
  body { padding-bottom: 52px; }
  .spec th { width: 104px; padding: 12px; font-size: 14px; }
  .spec td { padding: 12px; font-size: 14px; }
  .tl { padding-left: 24px; }
  .tl-i::before { left: -30px; }
}