/* ═══════════════════════════════════════════════════════════════
   唐算集团门户 全站样式 v2
   风格：理性建筑科技风 —— 深灰蓝主色，石材灰 / 混凝土色 / 金属银辅助，
        耐候钢色仅作点睛（金额 / 编号 / 强调线），编号用衬线数字
   原则：无无义装饰符号；每个视觉元素都有明确语义；动效克制
   ═══════════════════════════════════════════════════════════════ */

/* ── 1. 设计令牌 ── */
:root {
  --ink: #22303F;            /* 主色：深灰蓝 */
  --ink-2: #2C3E50;
  --deep: #17222E;
  --steel: #55636F;          /* 石材灰（次级文字） */
  --mut: #8A97A3;            /* 金属银灰（辅助文字） */
  --paper: #F5F6F8;
  --paper-2: #FBFCFD;
  --card: #FFFFFF;
  --line: #E6EAED;
  --line-2: #D5DBDF;
  --accent: #B0712F;         /* 耐候钢色：金额 / 序号 / 强调线，克制使用 */
  --accent-deep: #8F5A24;
  --accent-soft: #F7EFE3;
  --lv-jianshe: #22303F;
  --lv-zaojia: #41645C;
  --lv-keji: #6B5E4F;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 3px rgba(23, 34, 46, 0.05), 0 6px 18px rgba(23, 34, 46, 0.06);
  --shadow-up: 0 6px 16px rgba(23, 34, 46, 0.08), 0 18px 40px rgba(23, 34, 46, 0.12);
  --serif: Georgia, "Times New Roman", serif;
  --maxw: 1200px;
  --head-h: 66px;
}

/* ── 2. 基础 ── */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--paper); color: var(--ink);
  font-size: 15px; line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  display: flex; flex-direction: column; min-height: 100vh;
}
a { color: inherit; text-decoration: none; }
img, svg { display: block; }
ul, ol { list-style: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
input { font: inherit; }
main { flex: 1; }
::selection { background: var(--ink); color: #fff; }
.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.mut { color: var(--mut); }
.skip { position: absolute; left: -9999px; top: 0; background: var(--ink); color: #fff; padding: 8px 16px; z-index: 99; }
.skip:focus { left: 0; }

h1, h2, h3, h4 { line-height: 1.35; font-weight: 700; }
h2 { font-size: 28px; letter-spacing: 0.5px; }

/* 栏目眉标：短线 + 字距拉开的英文小标 */
.eyebrow {
  display: flex; align-items: center; gap: 10px;
  font-size: 12px; letter-spacing: 3px; color: var(--mut);
  text-transform: uppercase; margin-bottom: 10px;
}
.eb-line { width: 26px; height: 2px; background: linear-gradient(90deg, var(--accent), rgba(176, 113, 47, 0.15)); border-radius: 1px; }
.eyebrow.light { color: #9FB0BF; }

.sec { padding: 68px 0; }
.sec-alt { background: var(--card); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.sec-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 24px; margin-bottom: 36px; }
.sec-desc { color: var(--steel); margin-top: 10px; max-width: 640px; }
.more-link {
  color: var(--ink-2); font-weight: 600; white-space: nowrap;
  border-bottom: 1px solid var(--line-2); padding-bottom: 3px;
  display: inline-flex; align-items: center; gap: 6px;
  transition: color .18s, border-color .18s;
}
.more-link i { font-style: normal; transition: transform .18s; }
.more-link:hover { color: var(--accent-deep); border-color: var(--accent); }
.more-link:hover i { transform: translateX(3px); }

/* 按钮 */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--ink); color: #fff;
  padding: 13px 30px; border-radius: var(--radius-sm); font-weight: 600;
  border: 1px solid var(--ink);
  transition: background .18s, border-color .18s, transform .18s, box-shadow .18s;
}
.btn i { font-style: normal; transition: transform .18s; }
.btn:hover { background: var(--deep); border-color: var(--deep); transform: translateY(-1px); box-shadow: var(--shadow); }
.btn:hover i { transform: translateX(3px); }
.btn.ghost, .btn.ghost-light {
  background: transparent; color: var(--ink); border: 1px solid var(--line-2);
}
.btn.ghost-light { color: #E8EDF1; border-color: #5A6D80; }
.btn.ghost:hover, .btn.ghost-light:hover { border-color: var(--ink); background: rgba(34, 48, 63, 0.05); transform: none; }
.btn.ghost-light:hover { background: rgba(232, 237, 241, 0.1); }
.btn-hero { background: linear-gradient(135deg, #2C3E50, #22303F); padding: 15px 34px; font-size: 16px; }

/* 图标 */
.ico { width: 1em; height: 1em; }
.cover-art { width: 100%; height: 100%; object-fit: cover; }

/* ── 3. 头部导航 ── */
.site-head {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, 0.92); backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.head-inner { display: flex; align-items: center; justify-content: space-between; height: var(--head-h); gap: 20px; }
.brand { display: flex; align-items: center; gap: 11px; flex: none; }
.logo-mark { width: 38px; height: 38px; flex: none; }
.brand-txt { display: flex; flex-direction: column; line-height: 1.2; }
.brand-txt b { font-size: 18px; letter-spacing: 2px; }
.brand-txt i { font-style: normal; font-size: 9px; letter-spacing: 2.5px; color: var(--mut); }
.site-nav { display: flex; align-items: center; gap: 28px; font-size: 15px; }
.site-nav > a, .nav-item > a { padding: 6px 2px; position: relative; color: var(--ink-2); }
.site-nav > a::after, .nav-item > a::after {
  content: ""; position: absolute; left: 0; right: 100%; bottom: -2px; height: 2px;
  background: var(--accent); transition: right .22s ease;
}
.site-nav > a:hover::after, .nav-item > a:hover::after, .site-nav > a.on::after, .nav-item.on > a::after { right: 0; }
.site-nav > a.on, .nav-item.on > a { color: var(--ink); font-weight: 700; }
.nav-item { position: relative; }
.nav-item.has-sub > a { display: inline-flex; align-items: center; gap: 4px; }
.nav-item.has-sub > a::after { display: none; }
.nav-item.has-sub > a .nav-caret { display: inline-block; font-size: 10px; color: var(--mut); margin-left: 2px; transition: transform .2s; }
.nav-item.has-sub:hover > a .nav-caret { transform: rotate(180deg); }
.sub-toggle { display: none; }
.nav-sub {
  display: none; position: absolute; top: calc(100% + 12px); left: -14px;
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow-up); min-width: 160px; padding: 8px; z-index: 60;
}
.nav-sub::before { content: ""; position: absolute; top: -6px; left: 20px; width: 10px; height: 10px; background: #fff; border-left: 1px solid var(--line); border-top: 1px solid var(--line); transform: rotate(45deg); }
.nav-sub a { display: block; padding: 10px 14px; border-radius: var(--radius-sm); color: var(--ink-2); transition: background .15s, color .15s; }
.nav-sub a:hover { background: var(--paper); color: var(--ink); }
.nav-item.has-sub:hover .nav-sub { display: block; }
.nav-item.has-sub:hover > a { color: var(--ink); }
.nav-toggle { display: none; padding: 8px; color: var(--ink); }

/* ── 4. 首页 Hero（低饱和建筑夜景，SVG 自绘） ── */
.hero { position: relative; background: #182430; overflow: hidden; }
.banner-art { position: absolute; inset: 0; width: 100%; height: 100%; }
.hero-inner { position: relative; padding: 108px 24px 120px; max-width: var(--maxw); }
.hero-badge {
  display: inline-flex; align-items: center;
  border: 1px solid rgba(159, 176, 191, 0.4); border-radius: 999px;
  color: #B9C6D1; font-size: 13px; letter-spacing: 2px; padding: 6px 18px;
  background: rgba(23, 34, 46, 0.35);
}
.hero h1 { color: #F4F7F9; font-size: clamp(28px, 4.4vw, 46px); letter-spacing: 1px; margin: 22px 0 18px; line-height: 1.3; }
.hero h1 em { font-style: normal; color: var(--accent); padding: 0 10px; font-size: 0.72em; vertical-align: 6px; }
.hero-sub { color: #AEBDCA; max-width: 600px; font-size: 16px; }
.hero-cta { display: flex; gap: 14px; margin-top: 36px; flex-wrap: wrap; }
.hero-points { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 40px; }
.hero-points li {
  display: inline-flex; align-items: center; gap: 7px;
  color: #8FA3B4; font-size: 13px; letter-spacing: 1px;
}
.hero-points li::before {
  content: "✓"; color: var(--accent); font-size: 13px; font-weight: 700;
}

/* ── 5. 内页页头横幅 ── */
.page-hero { position: relative; background: linear-gradient(180deg, #FFFFFF, #FAFBFC); border-bottom: 1px solid var(--line); padding: 56px 0 44px; overflow: hidden; }
.page-hero::after {
  content: attr(data-en);
  position: absolute; right: -10px; bottom: -34px;
  font-size: 110px; font-weight: 800; letter-spacing: 6px;
  color: var(--ink); opacity: 0.035; white-space: nowrap; pointer-events: none;
  font-family: var(--serif);
}
.page-hero h1 { font-size: clamp(26px, 3.4vw, 36px); margin: 6px 0 12px; position: relative; }
.ph-desc { color: var(--steel); max-width: 720px; position: relative; }

/* ── 6. 网格体系 ── */
.grid-2, .grid-3, .grid-4 { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-1 { display: grid; gap: 16px; }
.stack { display: grid; gap: 16px; }

/* ── 7. 卡片体系 ── */
/* 三大业务板块卡 */
.biz-card {
  position: relative; background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 30px 28px 26px;
  display: flex; flex-direction: column; gap: 12px; overflow: hidden;
  transition: transform .22s, box-shadow .22s, border-color .22s;
}
.biz-card::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--ink), transparent 70%);
  transform: scaleX(0); transform-origin: left; transition: transform .3s ease;
}
.biz-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-up); border-color: var(--line-2); }
.biz-card:hover::before { transform: scaleX(1); }
.biz-ico {
  width: 58px; height: 58px; border-radius: 14px; font-size: 27px;
  display: flex; align-items: center; justify-content: center;
  background: #F0F3F6; color: var(--ink);
  transition: background .22s, color .22s, transform .22s;
}
.biz-card:hover .biz-ico { background: var(--ink); color: #fff; transform: rotate(-4deg) scale(1.05); }
.biz-head { display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; }
.biz-card h3 { font-size: 21px; }
.biz-en { font-size: 10px; letter-spacing: 2px; color: var(--mut); text-transform: uppercase; }
.biz-keys { display: flex; gap: 8px; flex-wrap: wrap; }
.biz-keys span {
  font-size: 12.5px; font-weight: 600; color: var(--ink-2);
  border: 1px solid var(--line-2); border-radius: 999px; padding: 3px 12px;
  background: var(--paper-2);
}
.biz-cap { color: var(--steel); font-size: 14px; flex: 1; }
.biz-go {
  color: var(--accent-deep); font-weight: 700; font-size: 14px; margin-top: 8px;
  display: inline-flex; align-items: center; gap: 6px;
}
.biz-go i { font-style: normal; transition: transform .18s; }
.biz-card:hover .biz-go i { transform: translateX(4px); }

/* 协同流程卡 */
.syn-flow { display: grid; grid-template-columns: 1fr auto 1fr auto 1fr; gap: 0; align-items: stretch; }
.syn-card {
  position: relative; background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 28px 26px; overflow: hidden;
}
.syn-n { font-family: var(--serif); font-size: 44px; font-weight: 700; color: transparent; -webkit-text-stroke: 1.2px #C4CDD4; line-height: 1; }
.syn-card h3 { margin: 12px 0 8px; font-size: 19px; }
.syn-card p { color: var(--steel); font-size: 14px; }
.syn-arrow { display: flex; align-items: center; justify-content: center; padding: 0 18px; color: var(--mut); }
.syn-arrow svg { width: 26px; height: 26px; }

/* 服务卡（造价/科技） */
.svc-card { position: relative; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px 24px; transition: border-color .2s, box-shadow .2s, transform .2s; }
.svc-card:hover { border-color: var(--ink); box-shadow: var(--shadow); transform: translateY(-3px); }
.svc-card h3 { font-size: 17px; margin-bottom: 10px; }
.svc-card p { color: var(--steel); font-size: 14px; }
.svc-card.main { border-top: 3px solid var(--ink); }
.svc-flag { position: absolute; top: 15px; right: 15px; font-size: 11px; font-weight: 600; color: var(--accent-deep); border: 1px solid #E0C9A8; background: var(--accent-soft); border-radius: 999px; padding: 2px 11px; }

/* 能力卡 */
.cap-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px 24px; transition: box-shadow .2s; }
.cap-card:hover { box-shadow: var(--shadow); }
.cap-card h3 { font-size: 16px; margin-bottom: 14px; padding-bottom: 12px; border-bottom: 1px solid var(--line); }
.cap-card p { color: var(--steel); font-size: 14px; }
.mut-card { background: repeating-linear-gradient(45deg, #FAFBFC, #FAFBFC 12px, #F4F6F8 12px, #F4F6F8 24px); }

/* 列表小勾（可交付成果等） */
.tick-list li { position: relative; padding-left: 24px; color: var(--steel); margin-bottom: 9px; font-size: 14.5px; }
.tick-list li::before {
  content: "✓"; position: absolute; left: 0; top: 0;
  color: var(--accent); font-weight: 700;
}

/* 资质入口横幅 */
.qual-banner {
  display: flex; align-items: center; gap: 18px;
  background: linear-gradient(135deg, #FFFFFF, #F7F9FA);
  border: 1px solid var(--line); border-left: 4px solid var(--ink);
  border-radius: var(--radius); padding: 24px 28px; transition: box-shadow .2s, transform .2s;
}
.qual-banner:hover { box-shadow: var(--shadow-up); transform: translateY(-2px); }
.qual-ico {
  flex: none; width: 56px; height: 56px; border-radius: 14px; font-size: 26px;
  display: flex; align-items: center; justify-content: center;
  background: #F0F3F6; color: var(--ink);
}
.qual-banner b { display: block; font-size: 17px; }
.qual-banner span:not(.biz-go) { color: var(--steel); font-size: 13.5px; }
.qual-banner .biz-go { margin-left: auto; flex: none; }

.team-note { margin-top: 20px; background: var(--card); border: 1px dashed var(--line-2); border-radius: var(--radius); padding: 18px 22px; color: var(--steel); font-size: 14px; }

/* 关于摘要 + 联系 */
.about-brief { display: grid; grid-template-columns: 1.6fr 1fr; gap: 48px; align-items: start; }
.about-brief p { color: var(--steel); margin-top: 14px; }
.contact-mini { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; }
.contact-mini h3 { margin-bottom: 14px; }
.contact-mini dt { font-size: 12px; color: var(--mut); margin-top: 12px; }
.contact-mini dd { font-weight: 600; }
.contact-mini .btn { margin-top: 20px; }

/* ── 8. 流程 / 时间线 ── */
.flow { display: grid; grid-template-columns: repeat(6, 1fr); gap: 12px; }
.flow li { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px 14px 18px; text-align: center; position: relative; transition: border-color .2s, transform .2s; }
.flow li:hover { border-color: var(--ink); transform: translateY(-3px); }
.flow .f-n { display: block; font-family: var(--serif); font-size: 22px; font-weight: 700; color: var(--accent); }
.flow .f-n::after { content: ""; display: block; width: 20px; height: 2px; background: var(--line-2); margin: 8px auto 0; border-radius: 1px; }
.flow span:last-child { font-size: 14px; font-weight: 600; display: block; margin-top: 8px; }
.flow li:not(:last-child)::after {
  content: "›"; position: absolute; right: -13px; top: 50%; transform: translateY(-50%);
  color: var(--mut); font-size: 20px; z-index: 1;
}
.flow.cols-5 { grid-template-columns: repeat(5, 1fr); }

.timeline { position: relative; padding-left: 8px; }
.timeline li { display: flex; gap: 18px; padding: 0 0 30px 0; position: relative; }
.timeline li::before { content: ""; position: absolute; left: 6px; top: 18px; bottom: -6px; width: 2px; background: var(--line); }
.timeline li:last-child::before { display: none; }
.t-dot { flex: none; width: 14px; height: 14px; border: 3px solid var(--ink); border-radius: 50%; background: #fff; margin-top: 4px; z-index: 1; }
.timeline b { color: var(--mut); font-weight: 600; }
.timeline p { color: var(--steel); font-size: 14px; }

/* ── 9. 业绩中心：Tab + 筛选 ── */
.tabs { display: flex; gap: 4px; flex-wrap: wrap; border-bottom: 2px solid var(--line); margin-bottom: 22px; }
.tab {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 18px; font-weight: 600; font-size: 14.5px; color: var(--steel);
  position: relative; margin-bottom: -2px; border-bottom: 2px solid transparent;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  transition: color .15s, background .15s;
}
.tab:hover { color: var(--ink); background: var(--paper-2); }
.tab.on { color: var(--ink); border-bottom-color: var(--ink); }
.tab-count {
  font-size: 11.5px; font-weight: 700; color: var(--mut);
  background: #EEF1F4; border-radius: 999px; padding: 1px 8px; font-family: var(--serif);
}
.tab.on .tab-count { background: var(--ink); color: #fff; }

.filter-bar { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 8px 22px; margin-bottom: 18px; box-shadow: var(--shadow); }
.f-row { display: flex; align-items: baseline; gap: 14px; padding: 13px 0; border-bottom: 1px dashed var(--line); }
.f-row:last-child { border-bottom: 0; }
.f-label { flex: none; width: 64px; font-size: 13px; color: var(--mut); }
.chips { display: flex; gap: 8px; flex-wrap: wrap; }
.chip {
  padding: 4px 15px; border: 1px solid var(--line-2); border-radius: 999px;
  font-size: 13px; color: var(--steel); background: var(--card);
  transition: all .15s;
}
.chip:hover { border-color: var(--ink); color: var(--ink); }
.chip.on { background: var(--ink); border-color: var(--ink); color: #fff; }
.f-search {
  width: 280px; padding: 8px 16px; border: 1px solid var(--line-2); border-radius: 999px;
  background: var(--card); outline: none; transition: border-color .15s, box-shadow .15s;
}
.f-search:focus { border-color: var(--ink); box-shadow: 0 0 0 3px rgba(34, 48, 63, 0.08); }
.result-count { color: var(--mut); font-size: 13px; margin: 8px 2px 14px; }
.result-count b { color: var(--ink); font-family: var(--serif); font-size: 15px; }
.empty-state { text-align: center; padding: 70px 0; color: var(--mut); }
.empty-state p { margin-bottom: 20px; }

/* ── 10. 案例卡片 ── */
.case-grid { min-height: 200px; }
/* 真实成果图封面（懒加载） */
.cover-img { width: 100%; height: 100%; object-fit: cover; }

/* BIM 案例库：统计条 + 大类导航 */
.lib-stats { display: flex; gap: 40px; flex-wrap: wrap; margin: 4px 0 22px; }
.lib-stats > div { display: flex; flex-direction: column; }
.lib-stats b { font-family: var(--serif); font-size: 34px; font-weight: 700; line-height: 1.2; color: var(--ink); }
.lib-stats span { font-size: 12.5px; color: var(--mut); letter-spacing: 1px; }
.cat-nav { display: flex; gap: 10px; flex-wrap: wrap; }
.cat-chip {
  display: inline-flex; align-items: center; gap: 8px;
  border: 1px solid var(--line-2); border-radius: 999px; padding: 7px 18px;
  font-size: 13.5px; font-weight: 600; color: var(--ink-2); background: var(--card);
  transition: all .15s;
}
.cat-chip i { font-style: normal; font-family: var(--serif); font-size: 13px; color: var(--mut); }
.cat-chip:hover { border-color: var(--ink); color: var(--ink); transform: translateY(-1px); }
.cat-sec { scroll-margin-top: 80px; }
/* 单图大图展示（近全屏高度，完整显示不裁切） */
.gallery.cols-1 { grid-template-columns: 1fr; }
.gallery.cols-1 .g-item { aspect-ratio: auto; max-height: 82vh; width: 100%; }
.gallery.cols-1 .g-item .cover-img { max-height: 82vh; width: 100%; height: auto; object-fit: contain; background: #F2F4F6; }
.case-card {
  display: flex; flex-direction: column; background: var(--card);
  border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden;
  transition: transform .22s, box-shadow .22s, border-color .22s;
}
.case-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-up); border-color: var(--line-2); }
.cc-cover { position: relative; aspect-ratio: 16/9; overflow: hidden; background: #EFF2F5; }
.cc-cover .cover-art { transition: transform .4s ease; }
.case-card:hover .cc-cover .cover-art { transform: scale(1.04); }
.cc-badge {
  position: absolute; top: 12px; left: 12px; font-size: 11px; font-weight: 600;
  color: #fff; padding: 3px 12px; border-radius: 999px; letter-spacing: 1px;
  backdrop-filter: blur(4px);
}
.v-jianshe .cc-badge { background: rgba(34, 48, 63, 0.92); }
.v-zaojia .cc-badge { background: rgba(65, 100, 92, 0.92); }
.v-keji .cc-badge { background: rgba(107, 94, 79, 0.92); }
.cc-body { padding: 18px 20px 16px; display: flex; flex-direction: column; gap: 8px; flex: 1; }
.cc-tags { display: flex; gap: 8px; }
.tag { font-size: 11.5px; padding: 2px 10px; border-radius: 999px; background: #EEF1F4; color: var(--steel); }
.tag-ghost { background: transparent; border: 1px solid var(--line-2); }
.cc-body h3 {
  font-size: 15.5px; line-height: 1.5; font-weight: 600;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
  min-height: 3em;
}
.cc-amount { color: var(--accent-deep); font-size: 13px; }
.cc-amount em { font-style: normal; font-size: 20px; font-weight: 700; font-family: var(--serif); letter-spacing: 0.5px; }
.cc-foot { display: flex; justify-content: space-between; align-items: center; margin-top: auto; padding-top: 12px; border-top: 1px solid var(--line); }
.cc-meta { font-size: 12.5px; color: var(--mut); }
.cc-more { font-size: 13px; color: var(--ink-2); font-weight: 600; display: inline-flex; gap: 5px; align-items: center; }
.cc-more::after { content: "→"; transition: transform .18s; }
.case-card:hover .cc-more { color: var(--accent-deep); }
.case-card:hover .cc-more::after { transform: translateX(3px); }

/* ── 11. 案例详情页 ── */
.crumbs { display: flex; align-items: center; gap: 10px; padding: 18px 0 0; font-size: 13px; color: var(--mut); flex-wrap: wrap; }
.crumbs a:hover { color: var(--ink); }
.crumbs em { font-style: normal; color: var(--ink-2); }
.crumbs span { color: var(--line-2); }
.detail-hero { background: linear-gradient(180deg, #FFFFFF, #FAFBFC); border-bottom: 1px solid var(--line); padding: 26px 0 38px; }
.detail-hero h1 { font-size: clamp(22px, 3vw, 32px); margin: 14px 0 12px; }
.dh-meta { color: var(--steel); font-size: 14px; }
.badges { display: flex; gap: 8px; flex-wrap: wrap; }
.badge { font-size: 12px; font-weight: 600; padding: 3px 13px; border-radius: 999px; letter-spacing: 1px; }
.badge.v-jianshe { background: var(--lv-jianshe); color: #fff; }
.badge.v-zaojia { background: var(--lv-zaojia); color: #fff; }
.badge.v-keji { background: var(--lv-keji); color: #fff; }
.badge.ghost { background: #EEF1F4; color: var(--steel); }
.badge.warn { background: var(--accent-soft); color: var(--accent-deep); border: 1px solid #E8D6B8; }

.param-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 30px 32px; box-shadow: var(--shadow); }
.param-card h2 { margin-bottom: 20px; }
.param-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0 44px; }
.param-grid dt { font-size: 12.5px; color: var(--mut); padding-top: 13px; letter-spacing: 1px; }
.param-grid dd { font-weight: 600; padding-bottom: 13px; border-bottom: 1px solid var(--line); }
.param-src { margin-top: 16px; font-size: 12.5px; color: var(--mut); }
.detail-sec h2 { margin-bottom: 22px; }
.prose p { color: var(--ink-2); max-width: 860px; }

/* 编号式工作清单（建设内容 / 工作内容） */
.work-list li { display: flex; gap: 16px; padding: 15px 0; border-bottom: 1px dashed var(--line); color: var(--ink-2); align-items: baseline; }
.work-list li:last-child { border-bottom: 0; }
.work-list li > i {
  font-style: normal; flex: none; width: 30px;
  font-family: var(--serif); font-size: 17px; font-weight: 700; color: var(--accent);
}
.work-list li > span { flex: 1; }
/* 难点清单：左强调线卡片式 */
.work-list.alt li {
  border-bottom: 0; border-left: 3px solid var(--accent);
  background: var(--paper-2); border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 13px 18px; margin-bottom: 10px;
}

/* 图集 */
.gallery { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.g-item { display: block; aspect-ratio: 20/13; border-radius: var(--radius-sm); overflow: hidden; border: 1px solid var(--line); transition: box-shadow .2s, transform .2s; }
.g-item:hover { box-shadow: var(--shadow-up); transform: translateY(-2px); }

/* ── 12. 资质页 ── */
.entity-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 30px 32px; box-shadow: var(--shadow); }
.entity-card h2 { margin-bottom: 20px; }
.entity-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0 36px; }
.entity-grid dt { font-size: 12.5px; color: var(--mut); padding-top: 13px; letter-spacing: 1px; }
.entity-grid dd { font-weight: 600; padding-bottom: 13px; border-bottom: 1px solid var(--line); }
.cert-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; display: flex; flex-direction: column; transition: box-shadow .2s, transform .2s; }
.cert-card:hover { box-shadow: var(--shadow-up); transform: translateY(-3px); }
.cert-view { display: block; aspect-ratio: 10/7; background: #F2F4F6; cursor: zoom-in; position: relative; }
.cert-view::after {
  content: "点击放大"; position: absolute; left: 50%; bottom: 12px; transform: translateX(-50%);
  font-size: 11px; color: #98A4AF; background: rgba(255, 255, 255, 0.9); border-radius: 999px; padding: 2px 12px;
  opacity: 0; transition: opacity .2s; letter-spacing: 1px;
}
.cert-view:hover::after { opacity: 1; }
.cert-art { width: 100%; height: 100%; }
.cert-body { padding: 20px 22px; }
.cert-body h3 { font-size: 16px; margin-bottom: 12px; }
.cert-body dl { display: grid; grid-template-columns: auto 1fr; gap: 7px 16px; font-size: 13.5px; }
.cert-body dt { color: var(--mut); }
.cert-note { margin-top: 12px; font-size: 12.5px; color: var(--mut); }

/* ── 13. 联系页 ── */
.contact-card { text-align: left; }
.contact-v { font-size: 17px; font-weight: 700; word-break: break-all; }
.contact-v.sm { font-size: 14px; font-weight: 600; color: var(--steel); }
.qr-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 32px; text-align: center; }
.qr-card h3 { margin-bottom: 18px; }
.qr-art { width: 172px; height: 172px; margin: 0 auto 14px; background: var(--paper-2); border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 14px; }

/* ── 14. 页脚 ── */
.site-foot { background: var(--deep); color: #B9C6D1; position: relative; }
.site-foot::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--accent), #55677A 40%, transparent 90%);
}
.foot-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1.3fr; gap: 36px; padding: 52px 0 38px; }
.foot-brand { display: flex; align-items: center; gap: 11px; margin-bottom: 16px; }
.foot-brand b { color: #fff; font-size: 17px; letter-spacing: 2px; }
.foot-about p { font-size: 13.5px; }
.foot-en { letter-spacing: 2px; font-size: 10px; color: #74889C; margin-top: 10px; }
.foot-col h4 { color: #E8EDF1; font-size: 14px; margin-bottom: 14px; }
.foot-col a, .foot-col span { display: block; color: #9FB0BF; font-size: 13.5px; padding: 4px 0; }
.foot-col a { transition: color .15s, transform .15s; }
.foot-col a:hover { color: #fff; transform: translateX(3px); }
.foot-legal {
  border-top: 1px solid #2E3F52; padding: 20px 0; font-size: 12.5px; color: #7E91A3; line-height: 1.9;
}
.foot-legal b { color: #B9C6D1; margin-right: 12px; }
.foot-bar { border-top: 1px solid #2E3F52; padding: 16px 0 22px; display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; font-size: 12.5px; color: #62778B; }

/* ── 15. 提示框 ── */
.note-box {
  display: flex; gap: 14px; align-items: baseline;
  background: var(--accent-soft); border: 1px solid #E8D6B8; border-left: 4px solid var(--accent);
  border-radius: var(--radius-sm); padding: 15px 20px; font-size: 13px; color: #7A6134; margin: 24px 0;
}
.note-box b { flex: none; }

/* ── 16. 图片放大弹层 ── */
.lightbox {
  position: fixed; inset: 0; z-index: 100; background: rgba(15, 22, 30, 0.82);
  backdrop-filter: blur(6px);
  display: flex; align-items: center; justify-content: center; padding: 32px;
  opacity: 0; pointer-events: none; transition: opacity .22s;
}
.lightbox.open { opacity: 1; pointer-events: auto; }
.lightbox-inner {
  background: #F2F4F6; border-radius: var(--radius); padding: 20px; max-width: min(880px, 92vw);
  display: flex; flex-direction: column; gap: 12px;
  transform: scale(0.96); transition: transform .22s;
}
.lightbox.open .lightbox-inner { transform: scale(1); }
.lightbox-inner .cover-art, .lightbox-inner .cert-art, .lightbox-inner .cover-img { width: 100%; height: auto; max-height: 82vh; object-fit: contain; }
.lightbox-cap { text-align: center; color: var(--steel); font-size: 13px; }
.lightbox-close {
  position: absolute; top: 20px; right: 26px; color: #fff; font-size: 30px; line-height: 1; padding: 8px;
  width: 46px; height: 46px; border-radius: 50%; border: 1px solid rgba(255, 255, 255, 0.3);
  transition: background .15s, transform .15s;
}
.lightbox-close:hover { background: rgba(255, 255, 255, 0.12); transform: rotate(90deg); }

/* ── 17. 动效（克制：仅淡入与筛选过渡） ── */
.fade { opacity: 0; transform: translateY(14px); transition: opacity .5s ease, transform .5s ease; }
.fade.in { opacity: 1; transform: none; }
.case-grid.filtering { opacity: 0.35; transition: opacity .15s; }
.case-grid { transition: opacity .2s; }
a:focus-visible, button:focus-visible, input:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .fade { opacity: 1; transform: none; transition: none; }
  .case-card, .biz-card, .svc-card { transition: none; }
}

/* ── 18. 响应式：平板两列 / 手机单列 ── */
@media (max-width: 1024px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .flow { grid-template-columns: repeat(3, 1fr); row-gap: 14px; }
  .flow li:not(:last-child)::after { display: none; }
  .flow.cols-5 { grid-template-columns: repeat(3, 1fr); }
  .syn-flow { grid-template-columns: 1fr; gap: 12px; }
  .syn-arrow { transform: rotate(90deg); padding: 6px 0; }
  .about-brief { grid-template-columns: 1fr; gap: 32px; }
  .foot-grid { grid-template-columns: repeat(2, 1fr); }
  .gallery { grid-template-columns: repeat(2, 1fr); }
  .entity-grid { grid-template-columns: repeat(2, 1fr); }
  .page-hero::after { font-size: 72px; }
}
@media (max-width: 720px) {
  .sec { padding: 46px 0; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .flow, .flow.cols-5 { grid-template-columns: repeat(2, 1fr); }
  .sec-head { flex-direction: column; align-items: flex-start; gap: 10px; margin-bottom: 26px; }
  h2 { font-size: 23px; }
  .hero-inner { padding: 76px 24px 88px; }
  .hero h1 em { padding: 0 6px; }

  /* 移动端导航：汉堡菜单 + 子菜单点击展开 */
  .nav-toggle { display: block; }
  .site-nav {
    display: none; position: absolute; top: var(--head-h); left: 0; right: 0;
    background: #fff; border-bottom: 1px solid var(--line); box-shadow: var(--shadow-up);
    flex-direction: column; align-items: stretch; gap: 0; padding: 8px 20px 16px;
    max-height: calc(100vh - var(--head-h)); overflow-y: auto;
  }
  body.nav-open .site-nav { display: flex; }
  .site-nav > a, .nav-item > a { padding: 14px 4px; border-bottom: 1px solid var(--line); display: block; }
  .site-nav > a::after, .nav-item > a::after { display: none; }
  .site-nav > a.on, .nav-item.on > a { color: var(--accent-deep); }
  .nav-item { display: flex; align-items: center; }
  .nav-item > a { flex: 1; }
  .sub-toggle { display: block; padding: 12px; color: var(--mut); transition: transform .2s; }
  .nav-item.open .sub-toggle { transform: rotate(180deg); }
  .nav-sub { display: none; position: static; box-shadow: none; border: 0; min-width: 0; padding: 0 0 10px 14px; }
  .nav-sub::before { display: none; }
  .nav-item.open .nav-sub { display: block; }
  .nav-sub a { border-bottom: 1px dashed var(--line); border-radius: 0; }

  /* 筛选器移动端 */
  .f-row { flex-wrap: wrap; gap: 8px; }
  .f-label { width: 100%; }
  .f-search { width: 100%; }
  .chips { overflow-x: auto; flex-wrap: nowrap; padding-bottom: 4px; -webkit-overflow-scrolling: touch; }
  .chip { flex: none; }
  .tabs { flex-wrap: nowrap; overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .tab { flex: none; padding: 10px 14px; font-size: 13.5px; }

  .param-grid, .entity-grid { grid-template-columns: 1fr; gap: 0 0; }
  .gallery { grid-template-columns: 1fr 1fr; gap: 10px; }
  .foot-grid { grid-template-columns: 1fr; gap: 26px; padding: 38px 0 28px; }
  .foot-bar { flex-direction: column; gap: 4px; }
  .note-box { flex-direction: column; gap: 4px; }
  .qual-banner { flex-wrap: wrap; }
  .qual-banner .biz-go { margin-left: 0; width: 100%; }
  .syn-n { font-size: 34px; }
  .param-card, .entity-card { padding: 22px 20px; }
}