/* ============================================================
   generic-31 · 通用型企业子站模板（GEO 规范版）
   类前缀：bt-   原型：D 纵向长页叙事（Botanical 植物）
   配色：森林 #1B4332 / 鼠尾草 #95B8A6 / 奶油 #F4F1E8 / 陶土 #C77D5A
   字体：衬线标题 + 无衬线正文；有机曲线圆角、大留白
   ============================================================ */

/* ---------- 设计令牌 ---------- */
.bt-body {
  --bt-forest: #1B4332;
  --bt-forest-2: #2D5A45;
  --bt-sage: #95B8A6;
  --bt-sage-soft: #E7EEE6;
  --bt-cream: #F4F1E8;
  --bt-cream-2: #FAF8F2;
  --bt-terra: #C77D5A;
  --bt-ink: #2B3A32;
  --bt-muted: #6E7A70;
  --bt-line: #DCD6C6;
  --bt-white: #fff;
  --bt-r: 16px;
  --bt-shadow: 0 24px 50px rgba(27, 67, 50, .08);
  --bt-serif: "Songti SC", "STSong", "Noto Serif SC", Georgia, "Times New Roman", serif;
  --bt-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
.bt-body {
  font-family: var(--bt-sans);
  color: var(--bt-ink);
  background: var(--bt-cream);
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
  scroll-behavior: smooth;
}
.bt-body img { max-width: 100%; height: auto; border: 0; display: block; }
a { color: inherit; text-decoration: none; }
.bt-body ul { list-style: none; margin: 0; padding: 0; }
.bt-wrap { width: 100%; max-width: 1160px; margin: 0 auto; padding: 0 24px; }
.bt-hide { display: none !important; }
.bt-noscroll { overflow: hidden; }

/* ---------- 通用区块 ---------- */
.bt-sec { padding: 96px 0; }
.bt-sec--cream { background: var(--bt-cream-2); }
.bt-sec--sage { background: var(--bt-sage-soft); }
.bt-chapter { display: block; font-family: var(--bt-serif); font-size: 24px; line-height: 1; color: var(--bt-terra); letter-spacing: .04em; }
.bt-about__label { display: block; margin: 8px 0 14px; font-size: 12px; letter-spacing: 3px; text-transform: uppercase; color: var(--bt-muted); }
.bt-title { font-family: var(--bt-serif); font-weight: 500; font-size: 40px; line-height: 1.28; color: var(--bt-forest); margin: 0 0 16px; letter-spacing: .01em; }
.bt-title--sub { font-size: 28px; margin-top: 42px; }
.bt-lead { font-size: 15px; color: var(--bt-muted); margin: 0 0 24px; max-width: 620px; }
.bt-more { display: inline-block; color: var(--bt-forest); font-size: 14px; font-weight: 600; letter-spacing: .06em; border-bottom: 1px solid var(--bt-terra); padding-bottom: 2px; }
.bt-more:hover { color: var(--bt-terra); }
.bt-center { text-align: center; margin-top: 30px; }
.bt-shead { display: flex; align-items: flex-end; justify-content: space-between; gap: 24px; margin-bottom: 34px; }
.bt-shead .bt-title { margin-bottom: 8px; }
.bt-shead .bt-lead { margin-bottom: 0; }
.bt-rich { font-size: 15px; color: var(--bt-ink); line-height: 2; max-width: 760px; }
.bt-rich p { margin: 0 0 14px; }
.bt-rich img { border-radius: 60px 60px 12px 12px; }
.bt-rich--panel { background: #fff; border: 1px solid var(--bt-line); border-radius: var(--bt-r); padding: 24px; }

/* ---------- 按钮 ---------- */
.bt-btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 12px 28px; border-radius: 999px; font-size: 14px; font-weight: 600;
  letter-spacing: .05em; border: 1px solid transparent; cursor: pointer; transition: all .22s ease;
}
.bt-btn--forest { background: var(--bt-forest); color: #fff; }
.bt-btn--forest:hover { background: var(--bt-forest-2); transform: translateY(-2px); }
.bt-btn--line { border-color: var(--bt-forest); color: var(--bt-forest); background: transparent; }
.bt-btn--line:hover { background: var(--bt-forest); color: #fff; }

/* ---------- 顶栏 ---------- */
.bt-top { background: var(--bt-forest); color: rgba(244, 241, 232, .8); font-size: 11px; letter-spacing: .08em; }
.bt-top__in { max-width: 1160px; margin: 0 auto; padding: 7px 24px; display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.bt-top__tel { color: var(--bt-cream); letter-spacing: .04em; }
.bt-top__tel:hover { color: var(--bt-terra); }
.bt-head { background: var(--bt-cream); border-bottom: 1px solid var(--bt-line); }
.bt-head__in { max-width: 1160px; margin: 0 auto; padding: 16px 24px; display: flex; align-items: center; gap: 22px; }
.bt-brand { display: flex; align-items: center; gap: 14px; flex: 0 0 auto; }
.bt-brand .bt-brand__img { height: 44px; width: auto; }
.bt-brand__title { display: flex; flex-direction: column; padding-left: 14px; border-left: 1px solid var(--bt-line); }
.bt-brand__name { font-family: var(--bt-serif); font-size: 22px; font-weight: 600; line-height: 1.3; color: var(--bt-forest); }
.bt-brand__meta { font-size: 11px; letter-spacing: .04em; color: var(--bt-muted); }
.bt-brand__meta b { color: var(--bt-terra); font-weight: 600; }
.bt-nav { margin-left: auto; display: flex; align-items: center; gap: 2px; flex-wrap: wrap; }
.bt-nav__item { position: relative; display: inline-block; padding: 8px 14px; font-size: 13px; letter-spacing: .08em; color: var(--bt-ink); }
.bt-nav__item::after { content: ""; position: absolute; left: 14px; right: 14px; bottom: 3px; height: 1px; background: transparent; }
.bt-nav__item:hover { color: var(--bt-terra); }
.bt-nav__item:hover::after, .bt-nav__on::after { background: var(--bt-terra); }
.bt-nav__on { color: var(--bt-forest); font-weight: 600; }
.bt-burger { display: none; margin-left: auto; width: 40px; height: 36px; background: transparent; border: 1px solid var(--bt-line); border-radius: 999px; padding: 7px 9px; cursor: pointer; }
.bt-burger span { display: block; height: 1px; background: var(--bt-forest); margin: 5px 0; }

/* ---------- 抽屉 ---------- */
.bt-drawer { display: none; position: fixed; inset: 0 0 0 auto; width: 80%; max-width: 330px; background: var(--bt-cream); z-index: 200; padding: 22px; overflow-y: auto; box-shadow: -14px 0 40px rgba(27, 67, 50, .18); }
.bt-drawer--open { display: block; }
.bt-drawer__head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 18px; }
.bt-drawer__name { font-family: var(--bt-serif); font-weight: 600; color: var(--bt-forest); }
.bt-drawer__close { border: 0; background: none; font-size: 26px; line-height: 1; cursor: pointer; color: var(--bt-muted); }
.bt-drawer__item { display: block; padding: 13px 6px; border-bottom: 1px solid var(--bt-line); font-size: 15px; }
.bt-drawer__on { color: var(--bt-terra); font-weight: 600; }
.bt-drawer__tel { display: block; margin-top: 22px; text-align: center; padding: 12px; border-radius: 999px; background: var(--bt-forest); color: #fff; font-weight: 600; }

/* ---------- Hero ---------- */
.bt-hero { position: relative; overflow: hidden; background: var(--bt-cream); }
.bt-hero__in { position: relative; z-index: 1; padding: 128px 24px 118px; }
.bt-hero__kicker { margin: 0 0 18px; font-size: 12px; letter-spacing: 4px; text-transform: uppercase; color: var(--bt-terra); }
.bt-hero__h1 { font-family: var(--bt-serif); font-weight: 400; font-size: 64px; line-height: 1.14; color: var(--bt-forest); margin: 0 0 22px; max-width: 880px; letter-spacing: .01em; }
.bt-hero__h1sub { display: block; margin-top: 10px; font-size: 26px; letter-spacing: .12em; color: var(--bt-sage); font-weight: 400; }
.bt-hero__lead { font-size: 16px; line-height: 1.9; color: var(--bt-ink); max-width: 620px; margin: 0 0 22px; }
.bt-hero__meta { display: flex; flex-wrap: wrap; gap: 8px 26px; font-size: 12px; letter-spacing: .06em; color: var(--bt-muted); margin: 0 0 38px; }
.bt-hero__meta a { color: var(--bt-forest); border-bottom: 1px solid var(--bt-terra); }
.bt-hero__link { display: inline-block; font-size: 12px; letter-spacing: .18em; text-transform: uppercase; color: var(--bt-forest); }
.bt-hero__link span { margin-left: 6px; color: var(--bt-terra); }
.bt-hero__leaf { position: absolute; width: 230px; height: 120px; border-radius: 0 100% 0 100%; background: var(--bt-sage); opacity: .38; pointer-events: none; }
.bt-hero__leaf--1 { top: 90px; right: 6%; transform: rotate(18deg); }
.bt-hero__leaf--2 { bottom: 80px; right: 24%; width: 150px; height: 80px; transform: rotate(-24deg); opacity: .24; }
.bt-hero__arc { position: absolute; right: -120px; bottom: -180px; width: 540px; height: 540px; border-radius: 50%; border: 1px solid rgba(27, 67, 50, .16); pointer-events: none; }

/* ---------- 锚点导航 ---------- */
.bt-anchor { position: sticky; top: 0; z-index: 55; background: rgba(244, 241, 232, .97); border-top: 1px solid var(--bt-line); border-bottom: 1px solid var(--bt-line); }
.bt-anchor__in { max-width: 1160px; margin: 0 auto; padding: 0 24px; display: flex; gap: 4px; overflow-x: auto; -webkit-overflow-scrolling: touch; }
.bt-anchor a { flex: 0 0 auto; display: inline-block; padding: 14px 20px; font-size: 12px; letter-spacing: .2em; text-transform: uppercase; color: var(--bt-forest); border-bottom: 1px solid transparent; }
.bt-anchor a:hover { color: var(--bt-terra); border-bottom-color: var(--bt-terra); }
#bt-about, #bt-strength, #bt-products, #bt-adv, #bt-news, #bt-contact { scroll-margin-top: 56px; }

/* ---------- 简介 ---------- */
.bt-about { padding-top: 92px; }
.bt-about__in { display: grid; grid-template-columns: 230px 1fr; gap: 56px; align-items: start; }
.bt-about__side { border-top: 1px solid var(--bt-line); padding-top: 20px; }
.bt-about__logo { margin-top: 26px; padding: 18px; background: #fff; border-radius: 100px 100px 12px 12px; border: 1px solid var(--bt-line); display: inline-block; }
.bt-about__logo img { max-height: 56px; width: auto; }
.bt-about__full {
  font-size: 15px; color: var(--bt-ink); line-height: 2; max-height: 250px; overflow: hidden; position: relative;
  -webkit-mask-image: linear-gradient(180deg, #000 78%, transparent);
  mask-image: linear-gradient(180deg, #000 78%, transparent);
}
.bt-about__full--open { max-height: none; -webkit-mask-image: none; mask-image: none; }
.bt-about__full p { margin: 0 0 14px; }
.bt-about__full img { display: none; }
.bt-about__toggle { margin: 12px 0 18px; }
.bt-about__btn { display: inline-flex; align-items: center; gap: 4px; border: 0; background: none; color: var(--bt-terra); font-size: 13px; font-weight: 600; letter-spacing: .04em; cursor: pointer; padding: 4px 0; font-family: inherit; }

/* ---------- 广告图 ---------- */
.bt-banner { padding-top: 40px; }
.bt-banner__figure { margin: 0; }
.bt-banner__figure img { width: 100%; height: auto; border-radius: 140px 140px 16px 16px; box-shadow: var(--bt-shadow); }
.bt-banner__cap { margin-top: 14px; font-size: 11px; letter-spacing: .16em; text-transform: uppercase; color: var(--bt-muted); text-align: center; }

/* ---------- 时间线 ---------- */
.bt-strength__in { display: grid; grid-template-columns: 300px 1fr; gap: 64px; align-items: start; }
.bt-strength__aside { position: sticky; top: 90px; }
.bt-timeline { border-left: 1px solid var(--bt-sage); margin-left: 6px; }
.bt-timeline__item { position: relative; padding: 0 0 34px 40px; }
.bt-timeline__item:last-child { padding-bottom: 0; }
.bt-timeline__item::before { content: ""; position: absolute; left: -5px; top: 8px; width: 9px; height: 9px; border-radius: 50%; background: var(--bt-cream); border: 1px solid var(--bt-forest); }
.bt-timeline__no { display: block; font-family: var(--bt-serif); font-size: 22px; line-height: 1; color: var(--bt-terra); margin-bottom: 6px; }
.bt-timeline__name { font-family: var(--bt-serif); font-size: 21px; font-weight: 500; color: var(--bt-forest); margin: 0 0 6px; }
.bt-timeline__desc { font-size: 14px; color: var(--bt-muted); margin: 0; max-width: 620px; }

/* ---------- 产品 ---------- */
.bt-prod__grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 34px; }
.bt-prod { display: block; }
.bt-prod__img { display: block; aspect-ratio: 4 / 5; overflow: hidden; border-radius: 80px 80px 12px 12px; background: var(--bt-sage-soft); }
.bt-prod__img img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s ease; }
.bt-prod:hover .bt-prod__img img { transform: scale(1.04); }
.bt-prod__name { display: block; margin-top: 16px; font-family: var(--bt-serif); font-size: 20px; font-weight: 500; color: var(--bt-forest); }
.bt-prod:hover .bt-prod__name { color: var(--bt-terra); }
.bt-prod__note { display: block; margin-top: 2px; font-size: 11px; letter-spacing: .08em; color: var(--bt-muted); }
.bt-region { display: inline-block; font-style: normal; font-family: var(--bt-sans); font-size: 10px; letter-spacing: .1em; color: var(--bt-terra); border: 1px solid rgba(199, 125, 90, .5); border-radius: 999px; padding: 1px 8px; margin-right: 7px; vertical-align: 3px; }

/* ---------- 优势 ---------- */
.bt-adv__grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 26px; }
.bt-adv__item { position: relative; background: #fff; border: 1px solid var(--bt-line); border-radius: var(--bt-r); padding: 30px 30px 26px; overflow: hidden; }
.bt-adv__leaf { position: absolute; right: -26px; top: -26px; width: 92px; height: 58px; border-radius: 0 100% 0 100%; background: var(--bt-sage-soft); transform: rotate(-18deg); }
.bt-adv__no { display: block; font-family: var(--bt-serif); font-size: 20px; color: var(--bt-terra); margin-bottom: 10px; }
.bt-adv__name { font-family: var(--bt-serif); font-size: 21px; font-weight: 500; color: var(--bt-forest); margin: 0 0 8px; }
.bt-adv__desc { font-size: 14px; color: var(--bt-muted); margin: 0; position: relative; }

/* ---------- 承诺/应用 ---------- */
.bt-duo__in { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; }
.bt-promise { display: grid; gap: 12px; }
.bt-promise__item { position: relative; padding: 10px 0 10px 26px; border-bottom: 1px solid rgba(27, 67, 50, .16); font-size: 14px; }
.bt-promise__item::before { content: ""; position: absolute; left: 0; top: 20px; width: 8px; height: 8px; border-radius: 0 100% 0 100%; background: var(--bt-forest); transform: rotate(45deg); }
.bt-apps { display: flex; flex-wrap: wrap; gap: 10px; }
.bt-apps__item { display: inline-block; padding: 8px 18px; border-radius: 999px; background: rgba(255, 255, 255, .72); border: 1px solid var(--bt-line); color: var(--bt-forest); font-size: 13px; }

/* ---------- 新闻 ---------- */
.bt-news__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.bt-news__item { display: block; border-top: 1px solid var(--bt-forest); padding-top: 16px; }
.bt-news__date { display: block; font-size: 11px; letter-spacing: .14em; color: var(--bt-terra); margin-bottom: 8px; }
.bt-news__title { display: block; font-family: var(--bt-serif); font-size: 19px; line-height: 1.5; color: var(--bt-forest); margin-bottom: 8px; }
.bt-news__item:hover .bt-news__title { color: var(--bt-terra); }
.bt-news__desc { display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; font-size: 13px; color: var(--bt-muted); }

/* ---------- FAQ ---------- */
.bt-faq__in { display: grid; grid-template-columns: 300px 1fr; gap: 60px; align-items: start; }
.bt-faq__item { border-bottom: 1px solid var(--bt-line); padding: 0 2px; }
.bt-faq__item summary { cursor: pointer; padding: 18px 30px 18px 0; font-family: var(--bt-serif); font-size: 18px; color: var(--bt-forest); list-style: none; position: relative; }
.bt-faq__item summary::-webkit-details-marker { display: none; }
.bt-faq__item summary::after { content: "+"; position: absolute; right: 2px; top: 50%; transform: translateY(-50%); font-family: var(--bt-sans); font-size: 20px; color: var(--bt-terra); }
.bt-faq__item[open] summary::after { content: "–"; }
.bt-faq__item p { margin: 0 0 18px; font-size: 14px; color: var(--bt-muted); max-width: 700px; }

/* ---------- 分站 ---------- */
.bt-city__grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 0 26px; }
.bt-city__item { display: block; padding: 14px 0; border-bottom: 1px solid var(--bt-line); }
.bt-city__region { display: block; font-family: var(--bt-serif); font-size: 18px; color: var(--bt-forest); }
.bt-city__site { display: block; font-size: 11px; letter-spacing: .06em; color: var(--bt-muted); }
.bt-city__item:hover .bt-city__region { color: var(--bt-terra); }
.bt-city__item--fold { display: none; }
.bt-city__grid.bt-city__grid--open .bt-city__item--fold { display: block; }
.bt-city__more { display: block; margin: 30px auto 0; padding: 9px 24px; border-radius: 999px; border: 1px solid var(--bt-forest); background: transparent; color: var(--bt-forest); cursor: pointer; font-size: 13px; font-family: inherit; }

/* ---------- 关联企业 ---------- */
.bt-partners__grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 0 30px; }
.bt-partners__item { display: flex; align-items: baseline; justify-content: space-between; gap: 10px; padding: 12px 0; border-bottom: 1px solid var(--bt-line); }
.bt-partners__item:hover .bt-partners__name { color: var(--bt-terra); }
.bt-partners__name { font-size: 14px; font-weight: 500; }
.bt-partners__region { font-size: 11px; color: var(--bt-muted); }

/* ---------- CTA ---------- */
.bt-cta { position: relative; overflow: hidden; background: var(--bt-forest); color: #fff; padding: 96px 0 104px; border-radius: 120px 120px 0 0; }
.bt-cta__in { position: relative; z-index: 1; text-align: center; }
.bt-cta__title { font-family: var(--bt-serif); font-weight: 400; font-size: 38px; line-height: 1.35; color: #fff; margin: 0 0 12px; }
.bt-cta__lead { margin: 0 0 26px; color: rgba(244, 241, 232, .8); font-size: 15px; }
.bt-cta__tel { display: inline-block; font-family: var(--bt-serif); font-size: 42px; letter-spacing: .06em; color: var(--bt-cream); border-bottom: 1px solid var(--bt-sage); padding-bottom: 4px; }
.bt-cta__tel:hover { color: #fff; border-color: #fff; }
.bt-cta__meta { margin: 24px 0 0; font-size: 11px; letter-spacing: .12em; color: rgba(244, 241, 232, .6); }
.bt-cta__arc { position: absolute; left: -140px; bottom: -200px; width: 520px; height: 520px; border: 1px solid rgba(244, 241, 232, .18); border-radius: 50%; }

/* ---------- 页脚 ---------- */
.bt-foot { background: var(--bt-forest); color: rgba(244, 241, 232, .78); font-size: 13px; border-radius: 0; }
.bt-foot__main { display: grid; grid-template-columns: 1.3fr .7fr 1fr; gap: 34px; max-width: 1160px; margin: 0 auto; padding: 46px 24px 30px; }
.bt-foot__name { font-family: var(--bt-serif); font-size: 22px; color: var(--bt-cream); margin-bottom: 8px; }
.bt-foot__desc { margin: 0 0 10px; }
.bt-foot__tel a { font-family: var(--bt-serif); color: var(--bt-sage); font-size: 21px; }
.bt-foot__tel a:hover { color: #fff; }
.bt-foot__tt { color: var(--bt-cream); font-weight: 500; margin-bottom: 10px; letter-spacing: .08em; }
.bt-foot__nav a { display: block; padding: 4px 0; color: rgba(244, 241, 232, .78); }
.bt-foot__nav a:hover { color: var(--bt-sage); }
.bt-foot__info p { margin: 0 0 6px; }
.bt-foot__info a { color: var(--bt-sage); }
.bt-foot__city { max-width: 1160px; margin: 0 auto; padding: 16px 24px; border-top: 1px solid rgba(244, 241, 232, .14); }
.bt-foot__citytt { color: var(--bt-cream); margin-right: 8px; }
.bt-foot__citylist { display: inline; }
.bt-foot__cityitem { display: inline-block; margin: 0 14px 6px 0; color: rgba(244, 241, 232, .72); }
.bt-foot__cityitem:hover { color: var(--bt-sage); }
.bt-foot__cityitem--fold { display: none; }
.bt-foot__citylist--open .bt-foot__cityitem--fold { display: inline-block; }
.bt-foot__morebtn { border: 1px solid rgba(244, 241, 232, .34); background: none; color: var(--bt-cream); border-radius: 999px; padding: 3px 12px; cursor: pointer; font-size: 11px; font-family: inherit; }
.bt-foot__nap { max-width: 1160px; margin: 0 auto; padding: 14px 24px; border-top: 1px solid rgba(244, 241, 232, .14); color: rgba(244, 241, 232, .5); font-size: 12px; }
.bt-foot__nap p { margin: 0 0 4px; }
.bt-foot__copy { max-width: 1160px; margin: 0 auto; padding: 16px 24px 26px; border-top: 1px solid rgba(244, 241, 232, .14); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; color: rgba(244, 241, 232, .46); }
.bt-foot__copy a { color: rgba(244, 241, 232, .62); }
.bt-foot__copy a:hover { color: var(--bt-sage); }

/* ---------- 拨号栏 ---------- */
.bt-dial { display: none; position: fixed; left: 0; right: 0; bottom: 0; z-index: 90; padding: 8px 12px; background: var(--bt-cream); border-top: 1px solid var(--bt-line); }
.bt-dial__tel { display: block; text-align: center; padding: 12px; border-radius: 999px; background: var(--bt-forest); color: #fff; font-weight: 600; }

/* ---------- 内页页头 ---------- */
.bt-page-hero { position: relative; overflow: hidden; background: var(--bt-forest); color: #fff; padding: 76px 0 84px; border-radius: 0 0 90px 0; }
.bt-page-hero__arc { position: absolute; right: -80px; top: -120px; width: 340px; height: 340px; border-radius: 50%; border: 1px solid rgba(244, 241, 232, .2); }
.bt-page-hero .bt-wrap { position: relative; z-index: 1; }
.bt-crumb { font-size: 12px; letter-spacing: .06em; color: rgba(244, 241, 232, .68); margin: 0 0 14px; }
.bt-crumb a { color: var(--bt-cream); }
.bt-page-hero__kicker { margin: 0 0 8px; font-size: 11px; letter-spacing: .28em; text-transform: uppercase; color: var(--bt-sage); }
.bt-page-h1 { font-family: var(--bt-serif); font-weight: 400; font-size: 44px; line-height: 1.3; margin: 0; color: #fff; max-width: 860px; }
.bt-crumb--dark { color: var(--bt-muted); margin: 0 0 26px; }
.bt-crumb--dark a { color: var(--bt-forest); }

/* ---------- 列表 ---------- */
.bt-list { display: grid; }
.bt-list__item { display: flex; gap: 26px; align-items: center; padding: 22px 0; border-bottom: 1px solid var(--bt-line); }
.bt-list__thumb { flex: 0 0 170px; height: 120px; overflow: hidden; border-radius: 60px 60px 10px 10px; background: var(--bt-sage-soft); }
.bt-list__thumb img { width: 100%; height: 100%; object-fit: cover; }
.bt-list__body { flex: 1 1 auto; min-width: 0; }
.bt-list__date { display: block; font-size: 11px; letter-spacing: .12em; color: var(--bt-terra); margin-bottom: 4px; }
.bt-list__title { display: block; font-family: var(--bt-serif); font-size: 20px; color: var(--bt-forest); margin-bottom: 6px; }
.bt-list__item:hover .bt-list__title { color: var(--bt-terra); }
.bt-list__desc { display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; font-size: 13px; color: var(--bt-muted); }
.bt-list__no { flex: 0 0 auto; font-family: var(--bt-serif); font-size: 26px; color: var(--bt-sage); }

/* 分页 */
.pagination { margin: 32px 0 0; text-align: center; font-size: 13px; }
.pagination a, .pagination span { display: inline-block; min-width: 34px; padding: 6px 10px; margin: 0 3px; border: 1px solid var(--bt-line); border-radius: 999px; color: var(--bt-ink); background: transparent; }
.pagination a:hover { border-color: var(--bt-forest); color: var(--bt-forest); }
.pagination .current { background: var(--bt-forest); border-color: var(--bt-forest); color: #fff; }

/* ---------- 新闻详情 ---------- */
.bt-newsdetail { display: grid; grid-template-columns: 1fr 310px; gap: 34px; align-items: start; }
.bt-post { background: var(--bt-cream-2); border: 1px solid var(--bt-line); border-radius: var(--bt-r); padding: 34px; }
.bt-post__meta { font-size: 11px; letter-spacing: .12em; color: var(--bt-muted); margin-bottom: 16px; }
.bt-post__cover { width: 100%; border-radius: 80px 80px 12px 12px; margin-bottom: 22px; }
.bt-post__body { font-size: 15px; color: var(--bt-ink); line-height: 2; }
.bt-post__body p { margin: 0 0 15px; }
.bt-post__body img { border-radius: 40px 40px 10px 10px; }
.bt-post__back { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 28px; }
.bt-side { border-top: 1px solid var(--bt-forest); padding-top: 18px; }
.bt-side__tt { font-family: var(--bt-serif); font-size: 20px; font-weight: 500; color: var(--bt-forest); margin: 0 0 12px; }
.bt-side__item { display: block; padding: 10px 0; border-bottom: 1px solid var(--bt-line); }
.bt-side__item:hover .bt-side__title { color: var(--bt-terra); }
.bt-side__title { display: block; font-size: 14px; color: var(--bt-ink); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.bt-side__date { display: block; font-size: 11px; color: var(--bt-muted); }
.bt-side__empty { font-size: 13px; color: var(--bt-muted); }

/* ---------- 产品详情 ---------- */
.bt-prodpage { padding-top: 44px; }
.bt-prodhero { display: grid; grid-template-columns: 1fr 1fr; gap: 44px; align-items: start; }
.bt-prodhero__media { background: var(--bt-cream-2); border: 1px solid var(--bt-line); border-radius: 120px 120px 16px 16px; padding: 16px; }
.bt-prodhero__media img { width: 100%; border-radius: 104px 104px 10px 10px; }
.bt-prodhero__h1 { font-family: var(--bt-serif); font-weight: 500; font-size: 34px; line-height: 1.35; color: var(--bt-forest); margin: 14px 0 12px; }
.bt-prodhero__desc { font-size: 15px; color: var(--bt-muted); margin: 0 0 22px; }
.bt-info { border-top: 1px solid var(--bt-line); margin-bottom: 24px; }
.bt-info__row { display: flex; gap: 12px; padding: 10px 0; border-bottom: 1px solid var(--bt-line); font-size: 14px; }
.bt-info__k { flex: 0 0 84px; color: var(--bt-muted); }
.bt-info__v { flex: 1 1 auto; color: var(--bt-ink); }
.bt-info__v a { color: var(--bt-terra); font-weight: 600; }
.bt-prodhero__btns { display: flex; gap: 12px; flex-wrap: wrap; }
.bt-prodshow { display: grid; grid-template-columns: 1fr 310px; gap: 34px; align-items: start; margin-top: 44px; }
.bt-prodshow__body { background: var(--bt-cream-2); border: 1px solid var(--bt-line); border-radius: var(--bt-r); padding: 30px; }
.bt-panel { border-top: 1px solid var(--bt-line); padding: 18px 0; }
.bt-panel__tt { font-family: var(--bt-serif); font-size: 17px; font-weight: 500; color: var(--bt-forest); margin: 0 0 8px; }
.bt-panel p { margin: 0 0 6px; font-size: 13px; color: var(--bt-muted); }
.bt-panel__list li { font-size: 13px; color: var(--bt-muted); padding: 6px 0; border-bottom: 1px solid var(--bt-line); }
.bt-panel__list li:last-child { border-bottom: 0; }
.bt-panel__list b { color: var(--bt-ink); }
.bt-chips { display: flex; flex-wrap: wrap; gap: 8px; }
.bt-chip { display: inline-block; padding: 4px 12px; border-radius: 999px; background: var(--bt-sage-soft); color: var(--bt-forest); font-size: 12px; }

/* ---------- 联系页 ---------- */
.bt-contact { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; }
.bt-card { background: var(--bt-cream-2); border: 1px solid var(--bt-line); border-radius: var(--bt-r); padding: 32px; }
.bt-card__tt { font-family: var(--bt-serif); font-size: 24px; font-weight: 500; color: var(--bt-forest); margin: 10px 0 16px; }
.bt-card__row { display: flex; gap: 12px; padding: 11px 0; border-bottom: 1px solid var(--bt-line); font-size: 15px; }
.bt-card__row:last-child { border-bottom: 0; }
.bt-card__k { flex: 0 0 84px; color: var(--bt-muted); }
.bt-card__row a { color: var(--bt-terra); font-weight: 600; }
.bt-steps { margin: 8px 0 18px; padding: 0 0 0 22px; list-style: decimal; font-size: 15px; color: var(--bt-ink); }
.bt-steps li { margin: 7px 0; padding-left: 4px; }

/* ---------- 辅助 ---------- */
.bt-top__welcome { opacity: .9; }
.bt-brand__logo, .bt-drawer__nav, .bt-main { display: block; }
.bt-foot__brand { min-width: 0; }
.bt-about__text, .bt-timeline__body, .bt-duo__col, .bt-faq__list, .bt-prodhero__info { min-width: 0; }
.bt-faq__aside { position: sticky; top: 90px; }
.bt-about__txt { letter-spacing: .04em; }
.bt-about__arr { font-size: 11px; }
.bt-moretxt { letter-spacing: .06em; }
.bt-products .bt-title { margin-bottom: 10px; }
.bt-empty { color: var(--bt-muted); font-size: 14px; padding: 34px 0; }

/* ---------- 响应式 ---------- */
@media (max-width: 960px) {
  .bt-nav { display: none; }
  .bt-burger { display: block; }
  .bt-hero__in { padding: 84px 24px 88px; }
  .bt-hero__h1 { font-size: 46px; }
  .bt-hero__h1sub { font-size: 22px; }
  .bt-about__in, .bt-strength__in, .bt-faq__in, .bt-newsdetail, .bt-prodshow, .bt-prodhero, .bt-contact { grid-template-columns: 1fr; gap: 34px; }
  .bt-strength__aside, .bt-faq__aside { position: static; }
  .bt-adv__grid, .bt-news__grid { grid-template-columns: repeat(2, 1fr); }
  .bt-news__grid .bt-news__item:last-child { grid-column: 1 / -1; }
  .bt-foot__main { grid-template-columns: 1fr; gap: 22px; }
  .bt-sec { padding: 70px 0; }
  .bt-title { font-size: 33px; }
  .bt-cta { border-radius: 80px 80px 0 0; }
  .bt-cta__title { font-size: 31px; }
}
@media (max-width: 640px) {
  .bt-top__in { font-size: 10px; }
  .bt-brand .bt-brand__img { height: 34px; }
  .bt-brand__name { font-size: 17px; }
  .bt-brand__meta { font-size: 10px; }
  .bt-head__in { padding: 12px 16px; }
  .bt-wrap { padding: 0 16px; }
  .bt-hero__in { padding: 64px 16px 70px; }
  .bt-hero__h1 { font-size: 33px; }
  .bt-hero__h1sub { font-size: 17px; letter-spacing: .08em; }
  .bt-hero__leaf { opacity: .22; }
  .bt-anchor__in { padding: 0 8px; }
  .bt-anchor a { padding: 12px 14px; font-size: 11px; }
  .bt-about__in { grid-template-columns: 1fr; gap: 22px; }
  .bt-about__side { display: flex; align-items: baseline; gap: 12px; }
  .bt-about__label { margin: 0; }
  .bt-about__logo { display: none; }
  .bt-adv__grid, .bt-news__grid, .bt-prod__grid, .bt-city__grid, .bt-partners__grid, .bt-duo__in { grid-template-columns: 1fr; }
  .bt-news__grid .bt-news__item:last-child { grid-column: auto; }
  .bt-timeline__item { padding-left: 30px; }
  .bt-list { gap: 0; }
  .bt-list__item { gap: 14px; align-items: flex-start; }
  .bt-list__thumb { flex: 0 0 96px; height: 82px; }
  .bt-list__title { font-size: 16px; }
  .bt-list__no { display: none; }
  .bt-page-h1 { font-size: 28px; }
  .bt-page-hero { padding: 52px 0 58px; border-radius: 0 0 56px 0; }
  .bt-cta { padding: 64px 0 72px; border-radius: 56px 56px 0 0; }
  .bt-cta__title { font-size: 25px; }
  .bt-cta__tel { font-size: 27px; }
  .bt-banner__figure img { border-radius: 70px 70px 12px 12px; }
  .bt-prodhero__h1 { font-size: 26px; }
  .bt-prodhero__media { border-radius: 70px 70px 14px 14px; }
  .bt-prodhero__media img { border-radius: 58px 58px 8px 8px; }
  .bt-dial { display: block; }
  .bt-body { padding-bottom: 70px; }
  .bt-post, .bt-prodshow__body, .bt-card { padding: 22px; }
}