:root {
    --bg: #fbf8f2;
    --bg-soft: #f5f0e6;
    --card: rgba(255,255,255,.62);
    --line: rgba(146,112,72,.16);
    --text: #302a21;
    --muted: #756a58;
    --accent: #cf5219;
    --accent2: #eb9c30;
  }
  * { margin: 0; padding: 0; box-sizing: border-box; }
  html { scroll-behavior: smooth; }
  body {
    font-family: -apple-system, "Segoe UI", "Helvetica Neue", Arial, "Microsoft YaHei", "PingFang SC", "Hiragino Sans GB", sans-serif;
    letter-spacing: .01em;
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
  }
  a { color: inherit; text-decoration: none; }
  .wrap { max-width: 1160px; margin: 0 auto; padding: 0 24px; }
  ::selection { background: rgba(235,156,48,.3); }
  ::-webkit-scrollbar { width: 10px; }
  ::-webkit-scrollbar-track { background: var(--bg); }
  ::-webkit-scrollbar-thumb { background: #ddd2bd; border-radius: 6px; }

  /* ===== 导航 ===== */
  header {
    position: fixed; top: 0; left: 0; right: 0; z-index: 100;
    backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
    background: rgba(251,248,242,.78);
    border-bottom: 1px solid var(--line);
  }
  nav { display: flex; align-items: center; justify-content: space-between; height: 62px; }
  .logo { display: flex; align-items: center; gap: 10px; font-size: 17px; font-weight: 700; letter-spacing: .5px; }
  .logo svg { display: block; }
  .logo em { font-style: normal; background: linear-gradient(92deg, var(--accent), var(--accent2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
  .nav-right { display: flex; align-items: center; gap: 28px; }
  .nav-links { display: flex; gap: 28px; font-size: 15px; color: var(--muted); }
  .nav-links a { position: relative; padding: 4px 0; transition: color .2s; }
  .nav-links a::after {
    content: ""; position: absolute; left: 0; bottom: 0; height: 2px; width: 0;
    background: linear-gradient(90deg, var(--accent), var(--accent2));
    transition: width .25s ease; border-radius: 2px;
  }
  .nav-links a:hover { color: var(--text); }
  .nav-links a:hover::after { width: 100%; }
  .nav-cta {
    font-size: 14px; font-weight: 600; padding: 7px 16px; border-radius: 8px;
    border: 1px solid rgba(207,82,25,.45); color: #c24b13;
    transition: all .2s ease;
  }
  .nav-cta:hover { background: rgba(207,82,25,.09); box-shadow: 0 0 16px rgba(235,156,48,.22); }
  @media (max-width: 760px) { .nav-links { display: none; } }

  /* ===== 首屏 ===== */
  .hero {
    min-height: 100vh; display: flex; align-items: center;
    position: relative; overflow: hidden;
    background:
      radial-gradient(900px 520px at 85% 8%, rgba(240,150,95,.2), transparent 62%),
      radial-gradient(820px 520px at 78% 30%, rgba(235,156,48,.14), transparent 60%),
      radial-gradient(680px 480px at 4% 92%, rgba(207,82,25,.09), transparent 60%),
      var(--bg);
  }
  .hero::before {
    content: ""; position: absolute; inset: 0;
    background-image:
      linear-gradient(rgba(146,112,72,.065) 1px, transparent 1px),
      linear-gradient(90deg, rgba(146,112,72,.065) 1px, transparent 1px);
    background-size: 46px 46px;
    -webkit-mask-image: radial-gradient(ellipse 75% 65% at 50% 42%, #000 25%, transparent 78%);
    mask-image: radial-gradient(ellipse 75% 65% at 50% 42%, #000 25%, transparent 78%);
  }
  .hero-inner {
    position: relative; z-index: 2; width: 100%;
    display: grid; grid-template-columns: 1.05fr .95fr; gap: 44px; align-items: center;
    padding: 112px 0 56px;
  }
  .hero-inner > * { min-width: 0; }
  .about-grid > * { min-width: 0; }
  @media (max-width: 960px) {
    .hero-inner { grid-template-columns: 1fr; padding-top: 108px; }
    .hero-art { max-width: 500px; margin: 0 auto; }
  }
  .tag {
    display: inline-flex; align-items: center; gap: 8px;
    font-size: 12.5px; color: #c24b13; letter-spacing: 2px;
    border: 1px solid rgba(207,82,25,.35); border-radius: 999px;
    padding: 4px 14px; margin-bottom: 18px;
    background: rgba(235,156,48,.08);
  }
  .tag::before {
    content: ""; width: 6px; height: 6px; border-radius: 50%;
    background: var(--accent2); box-shadow: 0 0 10px rgba(235,156,48,.9);
    animation: blink 2.2s ease-in-out infinite;
  }
  @keyframes blink { 0%,100% { opacity: 1; } 50% { opacity: .35; } }
  .company-line {
    display: flex; align-items: center; gap: 12px;
    color: var(--muted); font-size: 15px; letter-spacing: 3px;
    margin-bottom: 10px;
  }
  .company-line::before {
    content: ""; width: 28px; height: 1px; flex: none;
    background: linear-gradient(90deg, var(--accent), var(--accent2));
  }
  h1 { font-size: clamp(30px, 4.4vw, 48px); line-height: 1.3; font-weight: 800; letter-spacing: 1px; }
  h1 .grad {
    background: linear-gradient(100deg, #c24b13, var(--accent) 42%, var(--accent2));
    -webkit-background-clip: text; background-clip: text; color: transparent;
  }
  .hero p.sub { margin: 20px 0 24px; max-width: 560px; color: var(--muted); font-size: clamp(15.5px, 1.8vw, 17.5px); line-height: 1.85; }
  .chips { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 30px; }
  .chip {
    font-size: 13px; color: var(--muted); letter-spacing: 1px;
    border: 1px solid var(--line); border-radius: 999px; padding: 4px 13px;
    background: rgba(255,255,255,.55);
  }
  .btns { display: flex; gap: 14px; flex-wrap: wrap; }
  .btn {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 12px 26px; border-radius: 10px; font-size: 15.5px; font-weight: 600;
    transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
  }
  .btn-primary {
    background: linear-gradient(92deg, var(--accent), var(--accent2)); color: #fff;
    box-shadow: 0 8px 22px rgba(207,82,25,.3);
  }
  .btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 30px rgba(207,82,25,.4); }
  .btn-primary svg { transition: transform .18s ease; }
  .btn-primary:hover svg { transform: translateX(3px); }
  .btn-ghost { border: 1px solid var(--line); color: var(--text); background: rgba(255,255,255,.5); }
  .btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

  /* 首屏 SVG 插画 */
  .hero-art { position: relative; }
  .hero-art svg { width: 100%; height: auto; display: block; }
  .cell-hl { animation: cellp 3.2s ease-in-out infinite; }
  @keyframes cellp { 0%,100% { opacity: .15; } 50% { opacity: 1; } }
  .flow { stroke-dasharray: 10 210; animation: dashmove 3.8s linear infinite; }
  @keyframes dashmove { to { stroke-dashoffset: -220; } }
  .node-dot { animation: nodep 2.8s ease-in-out infinite; }
  @keyframes nodep { 0%,100% { opacity: .4; } 50% { opacity: 1; } }
  .twinkle { animation: nodep 3.4s ease-in-out infinite; }

  /* ===== 数据条 ===== */
  .stats {
    border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
    background: linear-gradient(180deg, rgba(245,240,230,.7), rgba(251,248,242,.7));
    position: relative;
  }
  .stats::before {
    content: ""; position: absolute; top: -1px; left: 50%; transform: translateX(-50%);
    width: 420px; max-width: 80%; height: 1px;
    background: linear-gradient(90deg, transparent, var(--accent), var(--accent2), transparent);
  }
  .stats .wrap { display: grid; grid-template-columns: repeat(3, 1fr); }
  .stat { padding: 34px 16px; text-align: center; position: relative; }
  .stat + .stat { border-left: 1px solid var(--line); }
  .stat b {
    display: block; font-size: clamp(26px, 3.4vw, 38px); font-weight: 800; letter-spacing: 1px;
    background: linear-gradient(100deg, #c24b13, var(--accent2));
    -webkit-background-clip: text; background-clip: text; color: transparent;
  }
  .stat i { font-style: normal; color: var(--muted); font-size: 14px; letter-spacing: 1px; }
  @media (max-width: 720px) {
    .stats .wrap { grid-template-columns: 1fr; }
    .stat + .stat { border-left: none; border-top: 1px solid var(--line); }
  }

  /* ===== 区块通用 ===== */
  section { padding: 76px 0; scroll-margin-top: 56px; position: relative; }
  .sec-head { text-align: center; margin-bottom: 44px; }
  .sec-head em { font-style: normal; color: var(--accent); font-size: 12px; letter-spacing: 4px; text-transform: uppercase; }
  .sec-head h2 { font-size: clamp(25px, 3.3vw, 36px); font-weight: 800; margin-top: 10px; letter-spacing: 1px; }
  .sec-head h2::after {
    content: ""; display: block; width: 56px; height: 3px; margin: 14px auto 0;
    border-radius: 3px; background: linear-gradient(90deg, var(--accent), var(--accent2));
  }
  .sec-head p { color: var(--muted); max-width: 620px; margin: 14px auto 0; font-size: 15.5px; }

  /* ===== 关于我们 ===== */
  .about-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 44px; align-items: center; }
  @media (max-width: 880px) { .about-grid { grid-template-columns: 1fr; } }
  .about-text h3 { font-size: clamp(21px, 2.4vw, 25px); font-weight: 700; margin-bottom: 16px; line-height: 1.5; }
  .about-text h3 span { background: linear-gradient(92deg, var(--accent), var(--accent2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
  .about-text p { color: var(--muted); margin-bottom: 13px; font-size: 16px; line-height: 1.85; text-align: justify; }
  .about-card {
    background: linear-gradient(155deg, rgba(255,255,255,.88), rgba(253,249,242,.88));
    border: 1px solid var(--line); border-radius: 16px; padding: 30px 28px;
    backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 20px 44px rgba(120,90,50,.12);
    position: relative; overflow: hidden;
  }
  .about-card::before {
    content: ""; position: absolute; top: 0; left: 0; right: 0; height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent), var(--accent2), transparent);
  }
  .about-card li {
    list-style: none; padding: 12px 0; border-bottom: 1px dashed var(--line);
    display: flex; justify-content: space-between; gap: 16px; font-size: 15.5px;
  }
  .about-card li:last-child { border-bottom: none; }
  .about-card li span { color: var(--muted); flex: none; }
  .about-card li b { color: var(--text); font-weight: 600; text-align: right; }

  /* ===== 业务卡片 ===== */
  .biz {
    background:
      radial-gradient(760px 420px at 50% 0%, rgba(235,156,48,.09), transparent 65%),
      var(--bg-soft);
    border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
  }
  .cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
  @media (max-width: 1040px) { .cards { grid-template-columns: repeat(2, 1fr); } }
  @media (max-width: 620px) { .cards { grid-template-columns: 1fr; } }
  .card {
    background: linear-gradient(165deg, rgba(255,255,255,.85), rgba(252,248,240,.85));
    border: 1px solid var(--line); border-radius: 14px;
    padding: 26px 22px; position: relative;
    backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
    transition: transform .22s ease, border-color .22s ease, box-shadow .22s ease;
  }
  .card::before {
    content: ""; position: absolute; top: -1px; left: 22px; right: 22px; height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent), var(--accent2), transparent);
    opacity: 0; transition: opacity .25s ease;
  }
  .card:hover {
    transform: translateY(-6px); border-color: rgba(207,82,25,.5);
    box-shadow: 0 18px 40px rgba(120,90,50,.14), 0 0 26px rgba(235,156,48,.13);
  }
  .card:hover::before { opacity: 1; }
  .card .icon {
    width: 50px; height: 50px; border-radius: 13px;
    display: flex; align-items: center; justify-content: center; margin-bottom: 18px;
    background: linear-gradient(140deg, rgba(207,82,25,.11), rgba(235,156,48,.09));
    border: 1px solid rgba(207,82,25,.28);
    box-shadow: 0 0 20px rgba(235,156,48,.1) inset;
  }
  .card h3 { font-size: 18px; font-weight: 700; margin-bottom: 9px; letter-spacing: .5px; }
  .card p { color: var(--muted); font-size: 15px; line-height: 1.75; }

  /* ===== 技术优势 ===== */
  .tech-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px 32px; max-width: 940px; margin: 0 auto; }
  @media (max-width: 720px) { .tech-list { grid-template-columns: 1fr; } }
  .tech-item {
    display: flex; gap: 14px; align-items: flex-start;
    padding: 18px 20px; border: 1px solid var(--line); border-radius: 13px;
    background: rgba(255,255,255,.55); transition: border-color .2s ease, background .2s ease;
  }
  .tech-item:hover { border-color: rgba(207,82,25,.45); background: rgba(255,255,255,.85); }
  .tech-item::before {
    content: ""; flex: none; width: 8px; height: 8px; margin-top: 9px; border-radius: 2px;
    background: linear-gradient(135deg, var(--accent), var(--accent2));
    transform: rotate(45deg); box-shadow: 0 0 10px rgba(235,156,48,.5);
  }
  .tech-item div b { display: block; font-size: 16.5px; margin-bottom: 3px; }
  .tech-item div span { color: var(--muted); font-size: 15px; }

  /* ===== 页脚 ===== */
  footer {
    border-top: 1px solid var(--line);
    background: linear-gradient(180deg, var(--bg-soft), #f0e8d6);
    padding: 48px 0 28px; position: relative;
  }
  footer::before {
    content: ""; position: absolute; top: -1px; left: 50%; transform: translateX(-50%);
    width: 420px; max-width: 80%; height: 1px;
    background: linear-gradient(90deg, transparent, var(--accent), var(--accent2), transparent);
  }
  .foot-grid { display: flex; justify-content: space-between; gap: 40px; flex-wrap: wrap; margin-bottom: 34px; }
  .foot-grid h4 { font-size: 16px; margin-bottom: 12px; display: flex; align-items: center; gap: 10px; }
  .foot-grid p { color: var(--muted); font-size: 14.5px; }
  .copyright { text-align: center; color: var(--muted); font-size: 13px; border-top: 1px solid var(--line); padding-top: 22px; letter-spacing: .5px; }

  /* ===== 滚动进场（仅 JS 可用时启用，无 JS 直接显示） ===== */
  .js .reveal { opacity: 0; transform: translateY(24px); transition: opacity .7s ease, transform .7s ease; transition-delay: var(--d, 0s); }
  .js .reveal.in { opacity: 1; transform: none; }
  @media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { animation: none !important; transition: none !important; }
    .reveal { opacity: 1 !important; transform: none !important; }
  }

/* ===== 详情页通用 ===== */
.sub-hero {
  padding: 140px 0 64px; position: relative; overflow: hidden;
  background:
    radial-gradient(820px 460px at 84% 8%, rgba(240,150,95,.18), transparent 62%),
    radial-gradient(680px 420px at 6% 92%, rgba(207,82,25,.07), transparent 60%),
    var(--bg);
}
.sub-hero::before {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(146,112,72,.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(146,112,72,.06) 1px, transparent 1px);
  background-size: 46px 46px;
  -webkit-mask-image: radial-gradient(ellipse 75% 65% at 50% 40%, #000 25%, transparent 78%);
  mask-image: radial-gradient(ellipse 75% 65% at 50% 40%, #000 25%, transparent 78%);
}
.sub-hero-grid {
  position: relative; z-index: 2;
  display: grid; grid-template-columns: 1.02fr .98fr; gap: 48px; align-items: center;
}
.sub-hero-grid > * { min-width: 0; }
@media (max-width: 960px) { .sub-hero-grid { grid-template-columns: 1fr; } }
.back-link {
  display: inline-flex; align-items: center; gap: 7px;
  color: var(--muted); font-size: 14px; margin-bottom: 24px; transition: color .2s;
}
.back-link:hover { color: var(--accent); }
.sub-hero h1 { font-size: clamp(30px, 4.2vw, 46px); line-height: 1.28; font-weight: 800; letter-spacing: 1px; margin: 16px 0 18px; }
.sub-hero h1 .grad {
  background: linear-gradient(100deg, #c24b13, var(--accent) 42%, var(--accent2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.sub-hero .lead { color: var(--muted); font-size: clamp(15px, 1.8vw, 17.5px); line-height: 1.85; max-width: 600px; }
.sub-hero-art svg { width: 100%; height: auto; display: block; }

/* 指标卡 */
.metrics { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
@media (max-width: 960px) { .metrics { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .metrics { grid-template-columns: 1fr; } }
.metric {
  background: linear-gradient(155deg, rgba(255,255,255,.9), rgba(253,249,242,.9));
  border: 1px solid var(--line); border-radius: 14px; padding: 24px 16px; text-align: center;
  transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease;
}
.metric:hover { transform: translateY(-4px); border-color: rgba(207,82,25,.45); box-shadow: 0 14px 32px rgba(120,90,50,.13); }
.metric b {
  display: block; font-size: clamp(24px, 2.6vw, 32px); font-weight: 800; letter-spacing: .5px;
  background: linear-gradient(100deg, #c24b13, var(--accent2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.metric span { color: var(--muted); font-size: 13.5px; }

/* 图表容器 */
.chart-box {
  background: linear-gradient(165deg, rgba(255,255,255,.88), rgba(252,248,240,.88));
  border: 1px solid var(--line); border-radius: 18px; padding: 30px 28px;
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
  box-shadow: 0 20px 44px rgba(120,90,50,.11);
}
.chart-box h3 { font-size: 18px; font-weight: 700; margin-bottom: 4px; }
.chart-box .chart-desc { color: var(--muted); font-size: 14px; margin-bottom: 20px; }
.chart-box svg { width: 100%; height: auto; display: block; }
.chart-note { display: flex; align-items: center; gap: 8px; color: var(--muted); font-size: 12.5px; margin-top: 16px; }
.chart-note::before {
  content: ""; width: 7px; height: 7px; border-radius: 1.5px; flex: none;
  background: linear-gradient(135deg, var(--accent), var(--accent2)); transform: rotate(45deg);
}

/* 流程步骤 */
.steps { display: grid; grid-template-columns: repeat(5, 1fr); gap: 14px; }
@media (max-width: 1020px) { .steps { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 640px) { .steps { grid-template-columns: 1fr; } }
.step {
  background: rgba(255,255,255,.6); border: 1px solid var(--line); border-radius: 14px;
  padding: 22px 18px; transition: border-color .2s ease, background .2s ease;
}
.step:hover { border-color: rgba(207,82,25,.4); background: rgba(255,255,255,.9); }
.step .num {
  width: 34px; height: 34px; border-radius: 50%; margin-bottom: 14px;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #fff; font-size: 14px; font-weight: 800;
  box-shadow: 0 6px 14px rgba(207,82,25,.28);
}
.step b { display: block; font-size: 15.5px; margin-bottom: 5px; }
.step span { color: var(--muted); font-size: 13.5px; line-height: 1.6; }

/* 场景标签 */
.scenario-chips { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; max-width: 860px; margin: 0 auto; }
.scenario-chips .chip { font-size: 13.5px; padding: 8px 18px; }

/* 内容双栏（深度解读） */
.deep-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px 40px; }
@media (max-width: 760px) { .deep-grid { grid-template-columns: 1fr; } }
.deep-item { display: flex; gap: 15px; align-items: flex-start; }
.deep-item::before {
  content: ""; flex: none; width: 8px; height: 8px; margin-top: 10px; border-radius: 2px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  transform: rotate(45deg); box-shadow: 0 0 10px rgba(235,156,48,.5);
}
.deep-item div b { display: block; font-size: 16px; margin-bottom: 4px; }
.deep-item div span { color: var(--muted); font-size: 14.5px; line-height: 1.75; }

/* 底部业务导航 */
.next-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
@media (max-width: 960px) { .next-grid { grid-template-columns: 1fr; } }
.next-card {
  display: block; background: rgba(255,255,255,.6); border: 1px solid var(--line);
  border-radius: 14px; padding: 22px 24px;
  transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease;
}
.next-card:hover {
  transform: translateY(-4px); border-color: rgba(207,82,25,.5);
  box-shadow: 0 14px 32px rgba(120,90,50,.13);
}
.next-card b { display: flex; align-items: center; justify-content: space-between; font-size: 16px; margin-bottom: 6px; }
.next-card b svg { flex: none; transition: transform .18s ease; }
.next-card:hover b svg { transform: translateX(4px); }
.next-card span { color: var(--muted); font-size: 13.5px; }

/* 首页卡片可点击化 */
a.card { display: block; color: inherit; }
.card .more {
  display: inline-flex; align-items: center; gap: 6px; margin-top: 14px;
  color: var(--accent); font-size: 13.5px; font-weight: 600;
}
.card .more svg { transition: transform .18s ease; }
.card:hover .more svg { transform: translateX(3px); }

/* 页脚联系链接 */
.foot-link {
  color: var(--accent); font-weight: 600;
  border-bottom: 1px solid rgba(207,82,25,.35);
  transition: color .2s ease, border-color .2s ease;
}
.foot-link:hover { color: #c24b13; border-color: var(--accent); }

/* 语言切换 */
.lang-switch {
  display: flex; border: 1px solid var(--line); border-radius: 8px;
  overflow: hidden; font-size: 13px; background: rgba(255,255,255,.5);
}
.lang-switch a { padding: 6px 11px; color: var(--muted); transition: color .2s, background .2s; }
.lang-switch a:hover { color: var(--accent); }
.lang-switch a.on { background: rgba(207,82,25,.1); color: var(--accent); font-weight: 700; }

/* ===== 手机版优化 ===== */
@media (max-width: 720px) {
  /* 数据条保持三栏紧凑排列，不再纵向堆叠 */
  .stats .wrap { grid-template-columns: repeat(3, 1fr); }
  .stat { padding: 22px 6px; }
  .stat b { font-size: clamp(20px, 5.6vw, 26px); }
  .stat i { font-size: 11.5px; letter-spacing: 0; }
  .stat + .stat { border-left: 1px solid var(--line); border-top: none; }
  /* 首屏按钮整行排列 */
  .btns .btn { flex: 1 1 100%; justify-content: center; }
  /* 导航收紧 */
  .nav-right { gap: 12px; }
  /* 首屏插画限宽 */
  .hero-art { max-width: 420px; }
  /* 详情页步骤两列 */
  .steps { grid-template-columns: repeat(2, 1fr); }
  /* 详情页指标卡两列 */
  .metrics { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 480px) {
  /* 超小屏隐藏导航 CTA（页脚保留联系方式），保证语言切换可见 */
  .nav-cta { display: none; }
  .lang-switch a { padding: 5px 8px; font-size: 12px; }
  /* 区块节奏收紧 */
  section { padding: 56px 0; }
  .sec-head { margin-bottom: 34px; }
  .chart-box { padding: 20px 16px; }
  .step .num { width: 30px; height: 30px; font-size: 13px; margin-bottom: 10px; }
  .metric { padding: 18px 12px; }
}