/* ==========================================================================
     B2B 单页信息页 v3 - 深色高端工业风
     炭黑底色 + 鎏金点缀 + 玻璃质感卡片
     ========================================================================== */
  :root {
    --bg: #0c1017;
    --bg-soft: #121824;
    --card: rgba(255, 255, 255, .035);
    --card-strong: rgba(255, 255, 255, .055);
    --line: rgba(255, 255, 255, .09);
    --line-strong: rgba(255, 255, 255, .16);
    --text: #e8edf3;
    --text-dim: #97a4b6;
    --gold: #f5b942;
    --gold-dark: #d98f14;
    --gold-grad: linear-gradient(135deg, #f7c948, #e8871e);
    --steel: #8ec1e8;
    --danger: #ff6b6b;
    --success: #4cc38a;
    --radius: 16px;
    --radius-sm: 10px;
    --shadow-glow: 0 10px 34px rgba(232, 135, 30, .28);
    --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue", Arial, sans-serif;
    --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", serif;
  }

  * { box-sizing: border-box; }

  html { scroll-behavior: smooth; scroll-padding-top: 88px; }

  body {
    margin: 0;
    font-family: var(--font-sans);
    font-size: 15px;
    line-height: 1.85;
    color: var(--text);
    background:
      radial-gradient(1100px 560px at 85% -10%, rgba(245, 185, 66, .09), transparent 60%),
      radial-gradient(900px 520px at -10% 25%, rgba(90, 140, 190, .10), transparent 60%),
      var(--bg);
    -webkit-font-smoothing: antialiased;
  }

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

  a { color: var(--steel); text-decoration: none; transition: color .2s ease; }
  a:hover { color: var(--gold); }

  .container { width: min(1200px, 100% - 32px); margin-inline: auto; }
  .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;
  }

  /* ---------- 顶部信息条 ---------- */
  .topbar {
    background: rgba(255, 255, 255, .03);
    border-bottom: 1px solid rgba(255, 255, 255, .06);
    color: var(--text-dim);
    font-size: 13px;
  }
  .topbar-inner { display: flex; align-items: center; justify-content: space-between; min-height: 36px; }
  .topbar-item { display: inline-flex; align-items: center; gap: 6px; }
  .topbar-item a { color: var(--gold); font-weight: 600; }

  /* ---------- 页头 ---------- */
  .site-header {
    position: sticky; top: 0; z-index: 50;
    background: rgba(12, 16, 23, .78);
    -webkit-backdrop-filter: blur(14px);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid rgba(255, 255, 255, .07);
    transition: box-shadow .25s ease;
  }
  .site-header.is-stuck { box-shadow: 0 10px 30px rgba(0, 0, 0, .45); }
  .header-inner { display: flex; align-items: center; gap: 28px; min-height: 72px; }

  .brand { display: inline-flex; align-items: center; gap: 12px; color: var(--text); }
  .brand-mark { flex: 0 0 auto; }
  .brand-text { display: flex; flex-direction: column; line-height: 1.3; }
  .brand-text strong { font-size: 19px; color: #fff; font-family: var(--font-serif); }
  .brand-text small { font-size: 12px; color: var(--gold); }
  .brand-light .brand-text strong { color: #fff; }
  .brand-light .brand-text small { color: var(--gold); }

  .main-nav ul { display: flex; gap: 4px; list-style: none; margin: 0; padding: 0; }
  .main-nav a {
    display: block; padding: 8px 14px; border-radius: var(--radius-sm);
    font-weight: 500; color: var(--text-dim);
  }
  .main-nav a:hover { color: var(--gold); background: rgba(245, 185, 66, .08); }
  .main-nav a.active { color: var(--gold); background: rgba(245, 185, 66, .10); }

  .header-phone {
    margin-left: auto; display: inline-flex; align-items: center; gap: 8px;
    color: var(--gold); font-weight: 700; white-space: nowrap;
  }
  .header-phone span { display: flex; flex-direction: column; line-height: 1.25; }
  .header-phone small { font-size: 11px; font-weight: 400; color: var(--text-dim); }

  /* ---------- Hero 展示区 ---------- */
  .hero {
    position: relative;
    padding: 64px 0 46px;
    text-align: center;
    overflow: hidden;
  }
  .hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
      linear-gradient(rgba(12, 16, 23, .62), rgba(12, 16, 23, .94)),
      repeating-linear-gradient(0deg, transparent 0 39px, rgba(255, 255, 255, .045) 39px 40px),
      repeating-linear-gradient(90deg, transparent 0 39px, rgba(255, 255, 255, .045) 39px 40px);
    pointer-events: none;
  }
  .hero-inner { position: relative; }
  .hero-kicker {
    display: inline-block;
    font-size: 12px; font-weight: 600; letter-spacing: 3px;
    color: var(--gold);
    border: 1px solid rgba(245, 185, 66, .35);
    background: rgba(245, 185, 66, .08);
    padding: 5px 16px; border-radius: 24px;
    margin-bottom: 18px;
  }
  .hero-title {
    margin: 0;
    font-family: var(--font-serif);
    font-size: clamp(30px, 4.5vw, 48px);
    line-height: 1.3;
    letter-spacing: 1px;
    background: linear-gradient(120deg, #fff, #f5cf7e 60%, var(--gold));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: #fff;
  }
  .hero-sub {
    margin: 14px auto 24px;
    max-width: 680px;
    color: var(--text-dim);
    font-size: 16px;
  }
  .hero-sub strong { color: var(--gold); }
  .hero-actions { display: flex; justify-content: center; gap: 14px; flex-wrap: wrap; }
  .hero-facts {
    display: flex; justify-content: center; flex-wrap: wrap; gap: 10px 26px;
    list-style: none; margin: 26px 0 0; padding: 16px 0 0;
    border-top: 1px dashed rgba(255, 255, 255, .14);
    font-size: 13px; color: var(--text-dim);
  }
  .hero-facts strong { color: var(--text); }

  /* ---------- 面包屑 ---------- */
  .breadcrumb { padding: 14px 0 2px; font-size: 13px; color: var(--text-dim); }
  .breadcrumb ol { display: flex; flex-wrap: wrap; gap: 6px; list-style: none; margin: 0; padding: 0; }
  .breadcrumb li + li::before { content: "/"; margin-right: 6px; color: rgba(255, 255, 255, .25); }
  .breadcrumb a { color: var(--text-dim); }
  .breadcrumb a:hover { color: var(--gold); }
  .breadcrumb [aria-current="page"] { color: var(--text); font-weight: 600; }

  /* ---------- 布局 ---------- */
  .layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 340px;
    gap: 24px;
    align-items: start;
    padding: 18px 0 48px;
  }
  .main, .sidebar { display: flex; flex-direction: column; gap: 24px; min-width: 0; }

  .card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    padding: 26px;
    transition: border-color .2s ease, transform .2s ease;
  }
  .card:hover { border-color: rgba(255, 255, 255, .16); }

  /* ---------- GEO 快速了解 ---------- */
  .quick-answer {
    background: linear-gradient(135deg, rgba(245, 185, 66, .12), rgba(232, 135, 30, .03));
    border: 1px solid rgba(245, 185, 66, .28);
    border-left: 4px solid var(--gold);
  }
  .quick-answer-head { display: flex; align-items: center; gap: 8px; color: var(--gold); margin-bottom: 6px; }
  .quick-answer-head h2 { margin: 0; font-size: 16px; font-family: var(--font-serif); }
  .quick-answer-text { margin: 0; color: #cdd6e1; }
  .quick-answer-text strong { color: #fff; }
  .quick-answer-text a { font-weight: 700; color: var(--gold); }

  /* ---------- 文章 ---------- */
  .article { padding: 30px; }
  .kicker {
    display: inline-block;
    font-size: 12px; font-weight: 600; letter-spacing: 1px;
    color: var(--gold);
    border: 1px solid rgba(245, 185, 66, .3);
    background: rgba(245, 185, 66, .08);
    padding: 3px 12px; border-radius: 20px;
    margin-bottom: 14px;
  }
  .article h1 {
    margin: 0 0 12px;
    font-family: var(--font-serif);
    font-size: clamp(22px, 3vw, 30px);
    line-height: 1.4;
    color: #fff;
  }
  .article-meta {
    display: flex; flex-wrap: wrap; gap: 8px 18px; padding-bottom: 18px;
    border-bottom: 1px solid var(--line);
    font-size: 13px; color: var(--text-dim);
  }
  .meta-item { display: inline-flex; align-items: center; gap: 5px; }
  .meta-item svg { color: var(--gold); }
  .article-body { padding-top: 18px; }
  .article-body p { margin: 13px 0; color: #c4cdd8; }
  .article-body p:first-child {
    font-size: 16px;
    color: #dfe6ee;
    background: rgba(255, 255, 255, .045);
    border: 1px solid var(--line);
    border-left: 3px solid var(--gold);
    border-radius: var(--radius-sm);
    padding: 14px 18px;
  }

  .gallery { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin: 20px 0; }
  .gallery-item {
    margin: 0;
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    overflow: hidden;
    background: rgba(255, 255, 255, .03);
  }
  .gallery-item img {
    width: 100%; aspect-ratio: 4 / 3; object-fit: cover;
    transition: transform .5s ease;
  }
  .gallery-item:hover img { transform: scale(1.03); }
  .gallery-item figcaption {
    padding: 8px 12px; font-size: 12px; color: var(--text-dim);
    border-top: 1px solid var(--line);
  }

  .article-foot {
    display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
    gap: 14px; margin-top: 26px; padding-top: 18px;
    border-top: 1px solid var(--line);
  }
  .tag-list { display: flex; flex-wrap: wrap; gap: 8px; }
  .tag-list span {
    font-size: 13px; color: var(--gold);
    background: rgba(245, 185, 66, .10);
    border: 1px solid rgba(245, 185, 66, .25);
    padding: 4px 14px; border-radius: 20px;
  }
  .share { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--text-dim); }
  .share a {
    border: 1px solid var(--line-strong);
    border-radius: 20px; padding: 3px 12px;
    font-size: 13px; color: var(--text);
  }
  .share a:hover { border-color: var(--gold); color: var(--gold); }

  /* ---------- 区块标题 ---------- */
  .section-head { margin-bottom: 18px; }
  .section-head h2 {
    margin: 0; font-size: 22px; color: #fff;
    font-family: var(--font-serif);
    padding-bottom: 10px;
    position: relative;
  }
  .section-head h2::after {
    content: "";
    position: absolute; left: 0; bottom: 0;
    width: 46px; height: 3px; border-radius: 2px;
    background: var(--gold-grad);
  }
  .section-head p { margin: 10px 0 0; font-size: 13px; color: var(--text-dim); }

  /* ---------- 更多作品 ---------- */
  .works-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
  .work-item {
    display: block;
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    overflow: hidden;
    background: rgba(255, 255, 255, .03);
    color: var(--text);
    transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
  }
  .work-item:hover {
    transform: translateY(-4px);
    box-shadow: 0 14px 30px rgba(0, 0, 0, .45);
    border-color: rgba(245, 185, 66, .55);
    color: var(--gold);
  }
  .work-item img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; transition: transform .45s ease; }
  .work-item:hover img { transform: scale(1.07); }
  .work-item span { display: block; padding: 9px 11px; font-size: 13px; line-height: 1.45; }

  /* ---------- 侧边栏 ---------- */
  .contact-card h2, .form-card h2, .related h2 {
    margin: 0 0 14px; font-size: 18px; color: #fff;
    font-family: var(--font-serif);
    padding-bottom: 10px;
    border-bottom: 2px solid rgba(245, 185, 66, .45);
    display: inline-block;
  }
  .contact-list { list-style: none; margin: 0 0 18px; padding: 0; display: flex; flex-direction: column; gap: 13px; }
  .contact-list li { display: flex; gap: 10px; align-items: flex-start; font-size: 14px; }
  .contact-list svg { flex: 0 0 auto; color: var(--gold); margin-top: 3px; }
  .contact-list div { display: flex; flex-direction: column; line-height: 1.5; }
  .contact-list span { font-size: 12px; color: var(--text-dim); }
  .contact-list strong { color: #fff; }
  .contact-list .phone-link strong {
    font-size: 19px; letter-spacing: .5px;
    background: var(--gold-grad);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: var(--gold);
  }

  /* ---------- 按钮 ---------- */
  .btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 6px;
    padding: 11px 24px; border: 0; border-radius: var(--radius-sm);
    font-family: inherit; font-size: 15px; font-weight: 700; cursor: pointer;
    transition: transform .15s ease, box-shadow .2s ease, background .2s ease;
  }
  .btn:hover { transform: translateY(-2px); }
  .btn-gold { background: var(--gold-grad); color: #221505; box-shadow: var(--shadow-glow); }
  .btn-gold:hover { color: #221505; box-shadow: 0 14px 40px rgba(232, 135, 30, .42); }
  .btn-outline {
    background: transparent; color: var(--text);
    border: 1px solid var(--line-strong);
  }
  .btn-outline:hover { border-color: var(--gold); color: var(--gold); box-shadow: none; }
  .btn-block { width: 100%; }

  /* ---------- 表单 ---------- */
  .form-tip { margin: 0 0 14px; font-size: 13px; color: var(--text-dim); }
  .field { margin-bottom: 12px; }
  .field label { display: block; font-size: 13px; font-weight: 600; color: var(--text); margin-bottom: 5px; }
  .field input, .field textarea {
    width: 100%; padding: 11px 13px;
    border: 1px solid var(--line-strong); border-radius: var(--radius-sm);
    font-family: inherit; font-size: 14px; color: var(--text);
    background: rgba(255, 255, 255, .04);
    transition: border-color .2s ease, box-shadow .2s ease;
    resize: vertical;
  }
  .field input::placeholder, .field textarea::placeholder { color: rgba(151, 164, 182, .7); }
  .field input:focus, .field textarea:focus {
    outline: none;
    border-color: var(--gold);
    box-shadow: 0 0 0 3px rgba(245, 185, 66, .16);
    background: rgba(255, 255, 255, .06);
  }
  .field .error-msg { display: none; font-size: 12px; color: var(--danger); margin: 4px 0 0; }
  .field.has-error input, .field.has-error textarea { border-color: var(--danger); }
  .field.has-error .error-msg { display: block; }
  .form-note { margin: 10px 0 0; font-size: 12px; color: rgba(151, 164, 182, .75); text-align: center; }
  .form-success { text-align: center; padding: 18px 0 8px; color: var(--success); }
  .form-success p { margin: 4px 0; color: var(--text-dim); font-size: 14px; }
  .form-success p strong { color: var(--success); font-size: 17px; }

  /* ---------- 大家都在看 ---------- */
  .related-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; }
  .related-list li { border-bottom: 1px dashed rgba(255, 255, 255, .12); }
  .related-list li:last-child { border-bottom: 0; }
  .related-list a {
    display: block; padding: 8px 0 8px 14px; position: relative;
    font-size: 13.5px; color: var(--text-dim);
    overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  }
  .related-list a::before {
    content: ""; position: absolute; left: 0; top: 15px;
    width: 6px; height: 6px; border-radius: 50%;
    background: var(--gold-grad);
  }
  .related-list a:hover { color: var(--gold); }

  /* ---------- 页脚 ---------- */
  .site-footer {
    background: #080b10;
    border-top: 1px solid rgba(245, 185, 66, .22);
    color: rgba(255, 255, 255, .72);
    margin-top: 24px;
  }
  .footer-inner { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 32px; padding: 44px 0 32px; }
  .footer-col h3 { color: #fff; font-size: 16px; margin: 0 0 14px; font-family: var(--font-serif); }
  .footer-col p { margin: 14px 0 0; font-size: 13px; color: rgba(255, 255, 255, .55); }
  .footer-col ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; font-size: 14px; }
  .footer-col a { color: rgba(255, 255, 255, .72); }
  .footer-col a:hover { color: var(--gold); }
  .footer-bottom { border-top: 1px solid rgba(255, 255, 255, .07); font-size: 12.5px; color: rgba(255, 255, 255, .42); }
  .footer-bottom p { margin: 10px 0; }

  /* ---------- 移动端快捷栏 / 返回顶部 ---------- */
  .mobile-bar {
    display: none;
    position: fixed; left: 0; right: 0; bottom: 0; z-index: 60;
    background: rgba(12, 16, 23, .92);
    -webkit-backdrop-filter: blur(14px);
    backdrop-filter: blur(14px);
    border-top: 1px solid rgba(255, 255, 255, .10);
  }
  .mobile-bar a {
    flex: 1; display: flex; align-items: center; justify-content: center; gap: 8px;
    padding: 13px; font-weight: 600; font-size: 15px; color: var(--gold);
  }
  .mobile-bar a:last-child { background: var(--gold-grad); color: #221505; }

  .back-top {
    position: fixed; right: 22px; bottom: 90px; z-index: 55;
    width: 42px; height: 42px; border: 0; border-radius: 50%;
    background: var(--gold-grad); color: #221505; cursor: pointer;
    display: grid; place-items: center; box-shadow: var(--shadow-glow);
    opacity: 0; visibility: hidden; transform: translateY(8px);
    transition: opacity .25s ease, transform .25s ease, visibility .25s ease;
  }
  .back-top.is-visible { opacity: 1; visibility: visible; transform: translateY(0); }
  .back-top:hover { background: linear-gradient(135deg, #eab13a, #d97e10); }

  /* ---------- 响应式 ---------- */
  @media (max-width: 1080px) {
    .layout { grid-template-columns: minmax(0, 1fr) 300px; }
    .works-grid { grid-template-columns: repeat(3, 1fr); }
  }
  @media (max-width: 960px) {
    .layout { grid-template-columns: 1fr; }
    .main-nav { display: none; }
    .footer-inner { grid-template-columns: repeat(2, 1fr); }
  }
  @media (max-width: 640px) {
    html { scroll-padding-top: 76px; }
    .header-inner { min-height: 64px; gap: 12px; }
    .header-phone { margin-left: auto; }
    .header-phone small { display: none; }
    .topbar-item:first-child { display: none; }
    .topbar-inner { justify-content: center; }
    .hero { padding: 42px 0 32px; }
    .hero-facts { gap: 8px 18px; }
    .card { padding: 20px; }
    .article { padding: 22px 16px; }
    .gallery, .works-grid { grid-template-columns: 1fr; }
    .mobile-bar { display: flex; }
    .back-top { bottom: 84px; }
    .footer-inner { grid-template-columns: 1fr; padding: 32px 0 24px; }
    .container { width: min(100% - 24px, 1200px); }
  }

  /* ---------- 入场动效 ---------- */
  .reveal { opacity: 0; transform: translateY(16px); transition: opacity .5s ease, transform .5s ease; }
  .reveal.is-in { opacity: 1; transform: none; }
  @media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    .reveal { opacity: 1; transform: none; transition: none; }
    * { transition-duration: .01ms !important; }
  }