/* =========================================================
   Ohmorigin 欧姆起源 - 企业官网全站样式
   ========================================================= */

:root {
  --primary: #0B5FFF;
  --primary-dark: #094FD0;
  --primary-light: #E8F0FF;
  --brand-cyan: #00C2FF;
  --ink: #101828;
  --text: #475467;
  --text-light: #667085;
  --bg: #FFFFFF;
  --bg-soft: #F5F7FA;
  --bg-blue-dark: #0A1E4B;
  --border: #E4E7EC;
  --radius: 14px;
  --shadow-sm: 0 2px 10px rgba(16, 24, 40, .06);
  --shadow-md: 0 10px 30px rgba(16, 24, 40, .10);
  --shadow-lg: 0 20px 50px rgba(11, 95, 255, .16);
  --gradient: linear-gradient(120deg, #0B5FFF 0%, #0B5FFF 25%, #00C2FF 100%);
  --font: "PingFang SC", "Microsoft YaHei", "Segoe UI", "Helvetica Neue", Arial, sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  color: var(--text);
  font-size: 16px;
  line-height: 1.7;
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; transition: color .25s ease; }
ul { list-style: none; }
.icon { width: 1em; height: 1em; display: inline-block; vertical-align: -0.125em; flex-shrink: 0; }
.btn-sm { padding: 10px 20px; font-size: 14px; }

.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 8px; padding: 13px 28px; border-radius: 999px;
  font-size: 15px; font-weight: 600; border: 2px solid transparent;
  cursor: pointer; transition: all .25s ease; white-space: nowrap;
  font-family: var(--font);
}
.btn-primary { background: var(--gradient); color: #fff; box-shadow: 0 8px 20px rgba(11,95,255,.30); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 26px rgba(11,95,255,.40); }
.btn-outline { background: transparent; color: #fff; border-color: rgba(255,255,255,.65); }
.btn-outline:hover { background: rgba(255,255,255,.14); border-color: #fff; }
.btn-ghost { background: transparent; color: var(--primary); border-color: var(--primary); }
.btn-ghost:hover { background: var(--primary-light); }
.btn-dark { background: var(--ink); color: #fff; }
.btn-dark:hover { background: #1D2939; }
.btn-block { width: 100%; }

/* ---------- 顶栏 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.logo { display: flex; align-items: center; gap: 12px; }
.logo-mark {
  width: 42px; height: 42px; border-radius: 11px;
  background: var(--gradient); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 16px; letter-spacing: .5px;
  box-shadow: 0 6px 14px rgba(11,95,255,.35);
}
.logo-img {
  width: 42px; height: 42px; border-radius: 11px;
  object-fit: contain; background: #fff;
  box-shadow: 0 6px 14px rgba(11,95,255,.35);
}
.logo-mark[hidden] { display: none; }
.footer-logo .logo-mark[hidden] { display: none; }
.logo-text { display: flex; flex-direction: column; line-height: 1.15; }
.logo-text strong { font-size: 18px; color: var(--ink); }
.logo-text small { font-size: 11px; color: var(--text-light); letter-spacing: 2px; text-transform: uppercase; }

.main-nav { display: flex; gap: 6px; }
.main-nav a {
  padding: 8px 16px; border-radius: 8px; font-weight: 500; color: var(--text);
}
.main-nav a:hover { color: var(--primary); background: var(--primary-light); }
.main-nav a.active { color: var(--primary); background: var(--primary-light); font-weight: 600; }

.header-actions { display: flex; align-items: center; gap: 12px; }
.lang-toggle {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 14px; border-radius: 999px; border: 1px solid var(--border);
  background: #fff; color: var(--ink); font-size: 14px; font-weight: 600;
  cursor: pointer; transition: all .25s ease; font-family: var(--font);
}
.lang-toggle:hover { border-color: var(--primary); color: var(--primary); }
.lang-toggle .icon { font-size: 15px; }
.nav-toggle {
  display: none; border: 1px solid var(--border); background: #fff;
  width: 42px; height: 42px; border-radius: 10px; font-size: 20px;
  cursor: pointer; color: var(--ink); font-family: var(--font);
}

@media (max-width: 900px) {
  .nav-toggle { display: block; }
  .main-nav {
    position: fixed; top: 72px; left: 0; right: 0;
    background: #fff; border-bottom: 1px solid var(--border);
    flex-direction: column; gap: 0; padding: 8px 24px 20px;
    display: none; box-shadow: var(--shadow-md);
  }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 14px 8px; border-radius: 8px; }
}

/* ---------- Hero ---------- */
.hero {
  position: relative; color: #fff; overflow: hidden;
  background-size: cover; background-position: center;
  background-color: var(--bg-blue-dark);
}
.hero::before {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(90deg, rgba(8,24,61,.88) 0%, rgba(8,24,61,.55) 45%, rgba(8,24,61,.15) 100%);
}
.hero-inner {
  position: relative; z-index: 2; min-height: 560px;
  display: flex; flex-direction: column; justify-content: center; align-items: flex-start;
  padding: 90px 24px;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(255,255,255,.12); border: 1px solid rgba(255,255,255,.25);
  padding: 7px 16px; border-radius: 999px; font-size: 13px; letter-spacing: 1px;
  margin-bottom: 22px; backdrop-filter: blur(4px);
}
.hero h1 { font-size: 52px; line-height: 1.2; font-weight: 800; margin-bottom: 18px; max-width: 640px; }
.hero h1 .grad-text { background: var(--gradient); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero p {
  font-size: 18px; max-width: 560px; color: rgba(255,255,255,.85); margin-bottom: 34px;
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }

@media (max-width: 768px) {
  .hero-inner { min-height: 480px; padding: 70px 24px; }
  .hero h1 { font-size: 34px; }
  .hero p { font-size: 16px; }
}

/* ---------- 区块通用 ---------- */
.section { padding: 88px 0; }
.section-soft { background: var(--bg-soft); }
.section-head { text-align: center; max-width: 680px; margin: 0 auto 52px; }
.section-head .eyebrow {
  display: inline-block; color: var(--primary); font-size: 14px; font-weight: 700;
  letter-spacing: 2px; text-transform: uppercase; margin-bottom: 10px;
}
.section-head h2 { font-size: 36px; color: var(--ink); line-height: 1.3; margin-bottom: 14px; font-weight: 800; }
.section-head p { font-size: 16px; color: var(--text-light); }

@media (max-width: 768px) {
  .section { padding: 60px 0; }
  .section-head h2 { font-size: 28px; }
}

/* ---------- 卡片栅格 ---------- */
.grid { display: grid; gap: 24px; }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 992px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; }
}

/* ---------- 特性卡片 ---------- */
.feature-card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 32px 26px; transition: all .3s ease;
}
.feature-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); border-color: transparent; }
.feature-icon {
  width: 56px; height: 56px; border-radius: 14px; margin-bottom: 20px;
  display: flex; align-items: center; justify-content: center;
  background: var(--primary-light); font-size: 26px;
}
.feature-card h3 { font-size: 19px; color: var(--ink); margin-bottom: 10px; }
.feature-card p { font-size: 14.5px; color: var(--text-light); }

/* ---------- 统计条 ---------- */
.stats-band {
  background: linear-gradient(120deg, #0A1E4B 0%, #0B3C99 60%, #0B5FFF 100%);
  color: #fff; padding: 64px 0;
}
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
.stats-item .num { font-size: 46px; font-weight: 800; background: var(--gradient); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stats-item .label { font-size: 15px; color: rgba(255,255,255,.75); margin-top: 6px; }
@media (max-width: 900px) { .stats-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .stats-item .num { font-size: 34px; } }

/* ---------- 产品轮播 ---------- */
.carousel { position: relative; max-width: 1080px; margin: 0 auto; }
.carousel-track { position: relative; overflow: hidden; border-radius: 20px; box-shadow: var(--shadow-lg); }
.carousel-slide {
  position: absolute; inset: 0; opacity: 0; visibility: hidden;
  transition: opacity .6s ease, visibility .6s ease;
  display: flex; align-items: stretch; background: #fff;
}
.carousel-slide.active { position: relative; opacity: 1; visibility: visible; }
.carousel-media { width: 55%; min-height: 340px; background-position: center; background-size: cover; background-color: #E8F0FF; }
.carousel-caption { width: 45%; padding: 44px 40px; display: flex; flex-direction: column; justify-content: center; }
.carousel-caption .cat {
  display: inline-block; font-size: 12px; font-weight: 700; letter-spacing: 1.5px;
  color: var(--primary); text-transform: uppercase; margin-bottom: 10px;
}
.carousel-caption h3 { font-size: 26px; color: var(--ink); margin-bottom: 12px; font-weight: 700; }
.carousel-caption p { font-size: 15px; color: var(--text-light); margin-bottom: 22px; }

.carousel-btn {
  position: absolute; top: 50%; transform: translateY(-50%); z-index: 5;
  width: 46px; height: 46px; border-radius: 50%; border: none; cursor: pointer;
  background: rgba(255,255,255,.95); color: var(--ink); font-size: 22px;
  box-shadow: var(--shadow-md); transition: all .25s ease;
  display: flex; align-items: center; justify-content: center; font-family: var(--font);
}
.carousel-btn:hover { background: var(--primary); color: #fff; }
.carousel-btn.prev { left: -23px; }
.carousel-btn.next { right: -23px; }
.carousel-dots { display: flex; justify-content: center; gap: 10px; margin-top: 24px; }
.carousel-dot {
  width: 10px; height: 10px; border-radius: 999px; border: none; cursor: pointer;
  background: #CBD5E1; transition: all .3s ease; padding: 0;
}
.carousel-dot.active { width: 28px; background: var(--primary); }

@media (max-width: 768px) {
  .carousel-slide { flex-direction: column; }
  .carousel-media { width: 100%; min-height: 220px; }
  .carousel-caption { width: 100%; padding: 28px 24px; }
  .carousel-caption h3 { font-size: 21px; }
  .carousel-btn.prev { left: 8px; }
  .carousel-btn.next { right: 8px; }
}

/* ---------- 产品卡片 ---------- */
.product-card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden; transition: all .3s ease; display: flex; flex-direction: column;
}
.product-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }
.product-card .thumb { aspect-ratio: 1/1; overflow: hidden; background: var(--primary-light); }
.product-card .thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s ease; }
.product-card:hover .thumb img { transform: scale(1.06); }
.product-card .body { padding: 20px 22px 24px; display: flex; flex-direction: column; flex: 1; }
.product-card .cat-tag {
  align-self: flex-start; font-size: 12px; color: var(--primary); font-weight: 600;
  background: var(--primary-light); padding: 3px 10px; border-radius: 999px; margin-bottom: 10px;
}
.product-card h3 { font-size: 18px; color: var(--ink); margin-bottom: 8px; }
.product-card p { font-size: 14px; color: var(--text-light); flex: 1; margin-bottom: 16px; }
.card-link { color: var(--primary); font-weight: 600; font-size: 14px; display: inline-flex; gap: 6px; align-items: center; }
.card-link:hover { gap: 10px; }

/* ---------- 分类 Tab ---------- */
.tabs { display: flex; justify-content: center; gap: 10px; flex-wrap: wrap; margin-bottom: 44px; }
.tab-btn {
  padding: 10px 22px; border-radius: 999px; border: 1px solid var(--border);
  background: #fff; color: var(--text); font-size: 14.5px; font-weight: 500;
  cursor: pointer; transition: all .25s ease; font-family: var(--font);
}
.tab-btn:hover { border-color: var(--primary); color: var(--primary); }
.tab-btn.active { background: var(--gradient); color: #fff; border-color: transparent; box-shadow: 0 6px 16px rgba(11,95,255,.30); }

/* ---------- 规格参数表 ---------- */
.spec-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.spec-table td { padding: 10px 14px; border: 1px solid var(--border); }
.spec-table td:first-child { width: 35%; background: var(--bg-soft); color: var(--ink); font-weight: 500; }
.feature-list li { position: relative; padding-left: 22px; font-size: 14px; margin-bottom: 8px; color: var(--text); }
.feature-list li::before { content: "✓"; position: absolute; left: 0; color: var(--primary); font-weight: 700; }

/* ---------- 产品详情页 ---------- */
.breadcrumb { display: flex; align-items: center; gap: 10px; padding: 22px 0 0; font-size: 14px; color: var(--text-light); flex-wrap: wrap; }
.breadcrumb a { color: var(--text-light); transition: color .2s; }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb .sep { color: var(--border); }
.breadcrumb span:last-child { color: var(--ink); font-weight: 600; }

.detail-layout { display: grid; grid-template-columns: 1.05fr 1fr; gap: 56px; align-items: start; }
.detail-media { border-radius: 20px; overflow: hidden; border: 1px solid var(--border); background: #fff; position: sticky; top: 104px; box-shadow: var(--shadow-sm); }
.detail-media img { width: 100%; display: block; aspect-ratio: 4/3; object-fit: cover; }
.detail-info .cat-tag { display: inline-block; margin-bottom: 14px; }
.detail-info h1 { font-size: 34px; color: var(--ink); line-height: 1.25; margin-bottom: 12px; font-weight: 800; }
.detail-info .tagline { font-size: 17px; color: var(--primary); font-weight: 600; margin-bottom: 18px; }
.detail-info .divider { height: 1px; background: var(--border); margin-bottom: 20px; }
.detail-info .desc { font-size: 15px; line-height: 1.85; color: var(--text); margin-bottom: 22px; }
.detail-info .mini-title { font-size: 16px; color: var(--ink); margin-bottom: 12px; }
.detail-actions { display: flex; gap: 14px; margin-top: 26px; flex-wrap: wrap; }
.spec-wrap { max-width: 860px; margin: 0 auto; background: #fff; border: 1px solid var(--border); border-radius: 16px; overflow: hidden; box-shadow: var(--shadow-sm); }
.spec-wrap .spec-table td { padding: 14px 20px; }
@media (max-width: 768px) {
  .detail-layout { grid-template-columns: 1fr; gap: 32px; }
  .detail-media { position: static; }
  .detail-info h1 { font-size: 26px; }
}

/* ---------- 服务卡片 ---------- */
.service-card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 34px 28px; text-align: center; transition: all .3s ease;
}
.service-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); border-color: transparent; }
.service-card .icon {
  width: 64px; height: 64px; margin: 0 auto 18px; border-radius: 18px;
  background: var(--gradient); display: flex; align-items: center; justify-content: center;
  font-size: 30px; box-shadow: 0 10px 22px rgba(11,95,255,.30);
}
.service-card h3 { font-size: 19px; color: var(--ink); margin-bottom: 10px; }
.service-card p { font-size: 14.5px; color: var(--text-light); }

/* ---------- 流程时间线 ---------- */
.timeline { position: relative; max-width: 920px; margin: 0 auto; display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.timeline::before {
  content: ""; position: absolute; top: 22px; left: 12%; right: 12%; height: 3px;
  background: var(--gradient); border-radius: 3px; opacity: .35;
}
.step { text-align: center; position: relative; }
.step .num {
  width: 46px; height: 46px; margin: 0 auto 16px; border-radius: 50%;
  background: var(--gradient); color: #fff; font-weight: 700; font-size: 18px;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 8px 18px rgba(11,95,255,.35); position: relative; z-index: 2;
}
.step h4 { font-size: 17px; color: var(--ink); margin-bottom: 8px; }
.step p { font-size: 13.5px; color: var(--text-light); }
@media (max-width: 900px) { .timeline { grid-template-columns: repeat(2, 1fr); } .timeline::before { display: none; } }

/* ---------- FAQ ---------- */
.faq-list { max-width: 820px; margin: 0 auto; }
.faq-item { border: 1px solid var(--border); border-radius: 12px; background: #fff; margin-bottom: 14px; overflow: hidden; }
.faq-item.open { border-color: var(--primary); box-shadow: var(--shadow-sm); }
.faq-q {
  width: 100%; background: none; border: none; padding: 20px 24px;
  font-size: 16px; font-weight: 600; color: var(--ink); cursor: pointer;
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
  text-align: left; font-family: var(--font);
}
.faq-q .arrow { transition: transform .3s ease; color: var(--primary); font-size: 18px; }
.faq-item.open .faq-q .arrow { transform: rotate(180deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .35s ease, padding .35s ease; padding: 0 24px; }
.faq-item.open .faq-a { max-height: 400px; padding: 0 24px 22px; }
.faq-a p { font-size: 14.5px; color: var(--text-light); }

/* ---------- 保修政策面板 ---------- */
.policy-panel {
  background: #fff; border: 1px solid var(--border); border-radius: 18px;
  padding: 40px; max-width: 820px; margin: 0 auto; box-shadow: var(--shadow-sm);
}
.policy-panel h3 { font-size: 20px; color: var(--ink); margin-bottom: 8px; }
.policy-panel > p { font-size: 14.5px; color: var(--text-light); margin-bottom: 20px; }
.policy-panel ul.feature-list li { margin-bottom: 12px; }
.policy-panel ul.feature-list li::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--primary); position: absolute; left: 0; top: 8px; }

/* ---------- CTA 横幅 ---------- */
.cta-band {
  background: linear-gradient(120deg, #0A1E4B 0%, #0B5FFF 100%);
  border-radius: 24px; padding: 60px 48px; color: #fff; text-align: center;
  position: relative; overflow: hidden;
}
.cta-band::after {
  content: ""; position: absolute; width: 360px; height: 360px; border-radius: 50%;
  background: rgba(0,194,255,.18); top: -140px; right: -100px;
}
.cta-band h2 { font-size: 30px; margin-bottom: 12px; position: relative; z-index: 2; }
.cta-band p { font-size: 16px; color: rgba(255,255,255,.8); margin-bottom: 28px; position: relative; z-index: 2; }
.cta-band .btn { position: relative; z-index: 2; }
@media (max-width: 768px) { .cta-band { padding: 44px 26px; } .cta-band h2 { font-size: 24px; } }

/* ---------- 页内 Banner ---------- */
.page-banner {
  position: relative; color: #fff; padding: 90px 0;
  background-size: cover; background-position: center; background-color: var(--bg-blue-dark);
}
.page-banner::before { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(8,24,61,.86), rgba(8,24,61,.45)); }
.page-banner .container { position: relative; z-index: 2; }
.page-banner .eyebrow { color: var(--brand-cyan); font-weight: 700; letter-spacing: 2px; text-transform: uppercase; font-size: 13px; margin-bottom: 10px; }
.page-banner h1 { font-size: 40px; margin-bottom: 12px; font-weight: 800; }
.page-banner p { font-size: 16.5px; color: rgba(255,255,255,.82); max-width: 620px; }
@media (max-width: 768px) { .page-banner { padding: 64px 0; } .page-banner h1 { font-size: 30px; } }

/* ---------- 表单 ---------- */
.form-card { background: #fff; border: 1px solid var(--border); border-radius: 18px; padding: 36px; box-shadow: var(--shadow-sm); }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 14px; font-weight: 600; color: var(--ink); margin-bottom: 8px; }
.form-control {
  width: 100%; padding: 13px 16px; border: 1px solid var(--border); border-radius: 10px;
  font-size: 15px; font-family: var(--font); color: var(--ink); background: #fff;
  transition: border-color .25s ease, box-shadow .25s ease;
}
.form-control:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(11,95,255,.15); }
.form-group.error label { color: #D92D20; }
.form-group.error .form-control { border-color: #D92D20; box-shadow: 0 0 0 3px rgba(217,45,32,.12); }
textarea.form-control { resize: vertical; min-height: 140px; }
.form-tip { font-size: 13px; color: var(--text-light); }
.form-success {
  display: none; padding: 16px 20px; border-radius: 10px; margin-top: 18px;
  background: #ECFDF3; border: 1px solid #ABEFC6; color: #067647; font-size: 14.5px;
}
.form-success.show { display: block; }

/* ---------- 信息卡片 ---------- */
.info-card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px 24px; display: flex; gap: 18px; align-items: flex-start; transition: all .3s ease;
  height: 100%;
}
.info-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.info-card .icon {
  flex-shrink: 0; width: 48px; height: 48px; border-radius: 13px;
  background: var(--primary-light); display: flex; align-items: center; justify-content: center; font-size: 22px;
}
.info-card h3 { font-size: 16px; color: var(--ink); margin-bottom: 6px; }
.info-card p { font-size: 14.5px; color: var(--text-light); word-break: break-all; }

/* ---------- 地图占位 ---------- */
.map-placeholder {
  border-radius: 18px; min-height: 320px; position: relative; overflow: hidden;
  background-size: cover; background-position: center; display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--border);
}
.map-placeholder::before { content: ""; position: absolute; inset: 0; background: rgba(10,30,75,.25); }
.map-pin {
  position: relative; z-index: 2; text-align: center; color: #fff;
  background: rgba(10,24,61,.55); backdrop-filter: blur(6px);
  padding: 18px 26px; border-radius: 16px; border: 1px solid rgba(255,255,255,.3);
}
.map-pin .pin-ico { font-size: 30px; margin-bottom: 6px; }
.map-pin strong { font-size: 18px; display: block; margin-bottom: 4px; }
.map-pin span { font-size: 14px; opacity: .9; }

/* ---------- 页脚 ---------- */
.site-footer { background: #0A1E4B; color: rgba(255,255,255,.75); padding: 70px 0 0; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1.2fr; gap: 44px; padding-bottom: 50px; }
.footer-logo { display: flex; align-items: center; gap: 12px; margin-bottom: 18px; }
.footer-logo .logo-mark { box-shadow: none; }
.footer-logo .logo-img { box-shadow: none; }
.footer-logo strong { color: #fff; font-size: 18px; display: block; }
.footer-logo small { color: rgba(255,255,255,.55); letter-spacing: 2px; text-transform: uppercase; font-size: 11px; }
.footer-about p { font-size: 14px; line-height: 1.8; }
.footer-col h4 { color: #fff; font-size: 16px; margin-bottom: 18px; }
.footer-col ul li { margin-bottom: 12px; }
.footer-col ul a { font-size: 14.5px; color: rgba(255,255,255,.72); }
.footer-col ul a:hover { color: var(--brand-cyan); }
.footer-contact li { display: flex; gap: 10px; margin-bottom: 14px; font-size: 14.5px; align-items: flex-start; }
.footer-contact .ico { width: 20px; text-align: center; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.12); padding: 22px 0; text-align: center;
  font-size: 13.5px; color: rgba(255,255,255,.5);
}
@media (max-width: 900px) { .footer-grid { grid-template-columns: 1fr; gap: 32px; } }

/* ---------- 回到顶部 ---------- */
.back-top {
  position: fixed; right: 26px; bottom: 26px; z-index: 150;
  width: 46px; height: 46px; border-radius: 50%; border: none; cursor: pointer;
  background: var(--gradient); color: #fff; font-size: 20px; box-shadow: var(--shadow-lg);
  opacity: 0; visibility: hidden; transform: translateY(12px);
  transition: all .3s ease;
}
.back-top.show { opacity: 1; visibility: visible; transform: none; }
.back-top:hover { transform: translateY(-3px); }

/* ---------- 技术资料检索（服务与支持页） ---------- */
.doc-search-box { display: flex; gap: 12px; max-width: 640px; margin: 0 auto; }
.doc-search-box .form-control { flex: 1; }
.doc-search-results { max-width: 860px; margin: 36px auto 0; text-align: left; }
.doc-result-card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px 26px; margin-bottom: 16px; box-shadow: var(--shadow-sm);
}
.doc-result-head h3 { font-size: 18px; color: var(--ink); margin: 10px 0 4px; }
.doc-result-head .cat-tag {
  display: inline-block; font-size: 12px; color: var(--primary); font-weight: 600;
  background: var(--primary-light); padding: 3px 10px; border-radius: 999px;
}
.doc-result-model { font-size: 13px; color: var(--text-light); font-weight: 500; }
.doc-result-body { margin-top: 16px; border-top: 1px dashed var(--border); padding-top: 14px; }
.doc-hint { font-size: 13.5px; color: var(--text-light); margin-bottom: 10px; }
.doc-list li {
  display: flex; align-items: center; gap: 12px; padding: 11px 14px;
  border-radius: 10px; background: var(--bg-soft); margin-bottom: 8px; font-size: 14px;
}
.doc-type {
  flex-shrink: 0; font-size: 11px; font-weight: 700; color: var(--primary);
  background: var(--primary-light); padding: 2px 9px; border-radius: 6px; letter-spacing: .5px;
}
.doc-title { flex: 1; color: var(--ink); word-break: break-all; }
.doc-dl { color: var(--primary); font-weight: 600; white-space: nowrap; }
.doc-dl:hover { color: var(--primary-dark); }
.doc-search-tip { text-align: center; color: var(--text-light); font-size: 14.5px; padding: 14px 0; }
@media (max-width: 560px) {
  .doc-search-box { flex-direction: column; }
}