/* ============================================================
   华塑管业 · 官网全局样式
   ============================================================ */

/* ---------- 字体（本地化） ---------- */
@font-face {
  font-family: 'Noto Sans SC';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('../fonts/noto-sans-sc-latin-400.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: 'Noto Sans SC';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url('../fonts/noto-sans-sc-latin-700.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: 'Noto Sans SC';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('../fonts/noto-sans-sc-chinese-400.woff2') format('woff2');
  unicode-range: U+3000-303F, U+3400-4DBF, U+4E00-9FFF, U+FF00-FFEF;
}
@font-face {
  font-family: 'Noto Sans SC';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url('../fonts/noto-sans-sc-chinese-700.woff2') format('woff2');
  unicode-range: U+3000-303F, U+3400-4DBF, U+4E00-9FFF, U+FF00-FFEF;
}

/* ---------- 设计变量 ---------- */
:root {
  --brand: #0B4B8C;
  --brand-dark: #093A6D;
  --brand-deep: #06294E;
  --brand-soft: #EAF2FB;
  --accent: #F2820F;
  --accent-dark: #D96F00;
  --ink: #16222E;
  --text: #44505E;
  --muted: #7C8894;
  --line: #E2E8EF;
  --bg-soft: #F5F8FB;
  --white: #FFFFFF;
  --radius: 10px;
  --radius-lg: 16px;
  --shadow: 0 10px 28px rgba(9, 58, 109, .08);
  --shadow-lg: 0 18px 46px rgba(9, 58, 109, .16);
  --font: 'Noto Sans SC', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --container: 1200px;
}

/* ---------- 基础 ---------- */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
h1, h2, h3, h4 { color: var(--ink); font-weight: 700; line-height: 1.35; }

.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }

/* ---------- 通用模块 ---------- */
.section { padding: 88px 0; }
.section-soft { background: var(--bg-soft); }
.section-head { max-width: 640px; margin: 0 auto 52px; text-align: center; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; font-weight: 700; letter-spacing: 3px;
  color: var(--accent); text-transform: uppercase;
}
.eyebrow::before, .eyebrow::after { content: ""; width: 26px; height: 2px; background: var(--accent); opacity: .55; }
.section-head h2 { font-size: 32px; margin: 10px 0 14px; letter-spacing: 1px; }
.section-head p { font-size: 15px; color: var(--muted); }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 30px; border-radius: 6px;
  font-size: 15px; font-weight: 700; letter-spacing: 1px;
  transition: all .25s ease; border: 1px solid transparent;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-dark); transform: translateY(-2px); box-shadow: 0 10px 22px rgba(242, 130, 15, .3); }
.btn-outline { border-color: rgba(255, 255, 255, .75); color: #fff; }
.btn-outline:hover { background: rgba(255, 255, 255, .14); }
.btn-ghost { border-color: var(--brand); color: var(--brand); }
.btn-ghost:hover { background: var(--brand); color: #fff; }

.tag {
  display: inline-block; padding: 4px 12px; border-radius: 20px;
  font-size: 12px; font-weight: 700; background: var(--brand-soft); color: var(--brand);
}

/* ---------- 顶部信息条 ---------- */
.topbar { background: var(--brand-deep); color: rgba(255, 255, 255, .82); font-size: 13px; }
.topbar .container { display: flex; align-items: center; justify-content: space-between; min-height: 38px; }
.topbar a { transition: color .2s; }
.topbar a:hover { color: #fff; }
.topbar .tb-left { display: flex; gap: 24px; }
.topbar .tb-right { display: flex; gap: 20px; align-items: center; }
.topbar svg { width: 14px; height: 14px; vertical-align: -2px; margin-right: 5px; }

/* ---------- 主导航 ---------- */
.header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, .96);
  border-bottom: 1px solid var(--line);
  transition: box-shadow .25s ease;
}
.header.scrolled { box-shadow: var(--shadow); }
.header .container { display: flex; align-items: center; justify-content: space-between; height: 76px; }
.logo { display: flex; align-items: center; gap: 12px; }
.logo-mark { width: 46px; height: 46px; flex: none; }
.logo-text { display: flex; flex-direction: column; line-height: 1.15; }
.logo-text strong { font-size: 24px; color: var(--brand); letter-spacing: 2px; }
.logo-text em { font-style: normal; font-size: 10px; letter-spacing: 3.5px; color: var(--muted); margin-top: 2px; }

.nav { display: flex; align-items: center; gap: 6px; }
.nav a {
  padding: 10px 18px; border-radius: 6px;
  font-size: 15.5px; font-weight: 500; color: var(--ink);
  transition: color .2s, background .2s;
}
.nav a:hover { color: var(--brand); background: var(--brand-soft); }
.nav a.active { color: var(--brand); font-weight: 700; background: var(--brand-soft); }

.hamburger { display: none; width: 42px; height: 42px; border-radius: 8px; }
.hamburger span { display: block; width: 22px; height: 2px; background: var(--ink); margin: 5px auto; transition: all .3s; border-radius: 2px; }
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- 首页 Hero ---------- */
.hero {
  position: relative; min-height: 640px;
  display: flex; align-items: center;
  color: #fff; overflow: hidden;
}
.hero-bg { position: absolute; inset: 0; }
.hero-bg img { width: 100%; height: 100%; object-fit: cover; }
.hero-bg::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(100deg, rgba(6, 41, 78, .92) 0%, rgba(6, 41, 78, .72) 42%, rgba(6, 41, 78, .28) 100%);
}
.hero .container { position: relative; z-index: 2; }
.hero-kicker {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; font-weight: 700; letter-spacing: 4px; color: #FFD9AE;
  border: 1px solid rgba(255, 217, 174, .45); border-radius: 30px;
  padding: 6px 18px; margin-bottom: 26px;
}
.hero h1 { color: #fff; font-size: 52px; line-height: 1.22; letter-spacing: 1px; max-width: 640px; }
.hero h1 .hl { color: #FFB45C; }
.hero p { margin: 22px 0 36px; font-size: 17px; color: rgba(255, 255, 255, .86); max-width: 560px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-scroll {
  position: absolute; bottom: 28px; left: 50%; transform: translateX(-50%);
  color: rgba(255, 255, 255, .7); font-size: 12px; letter-spacing: 2px;
  animation: float 2.2s ease-in-out infinite;
}
@keyframes float { 0%, 100% { transform: translate(-50%, 0); } 50% { transform: translate(-50%, 8px); } }

/* ---------- 数据条 ---------- */
.stats { background: var(--brand); color: #fff; }
.stats .container { display: grid; grid-template-columns: repeat(4, 1fr); }
.stat { padding: 40px 24px; text-align: center; position: relative; }
.stat + .stat::before { content: ""; position: absolute; left: 0; top: 22%; bottom: 22%; width: 1px; background: rgba(255, 255, 255, .16); }
.stat b { display: block; font-size: 42px; font-weight: 700; color: #FFC078; line-height: 1.2; }
.stat b i { font-style: normal; font-size: 20px; margin-left: 2px; }
.stat span { font-size: 14px; color: rgba(255, 255, 255, .82); letter-spacing: 1px; }

/* ---------- 首页简介 ---------- */
.intro-grid { display: grid; grid-template-columns: 1.05fr 1fr; gap: 56px; align-items: center; }
.intro-media { position: relative; }
.intro-media img { border-radius: var(--radius-lg); box-shadow: var(--shadow-lg); aspect-ratio: 4/3; object-fit: cover; }
.intro-media .badge {
  position: absolute; right: -18px; bottom: 28px;
  background: var(--accent); color: #fff; border-radius: 12px;
  padding: 18px 22px; text-align: center; box-shadow: var(--shadow-lg);
}
.intro-media .badge b { display: block; font-size: 28px; line-height: 1.1; }
.intro-media .badge span { font-size: 12px; letter-spacing: 1px; opacity: .92; }
.intro-text .eyebrow { margin-bottom: 14px; }
.intro-text h2 { font-size: 30px; margin-bottom: 18px; letter-spacing: 1px; }
.intro-text p { margin-bottom: 14px; font-size: 15px; }
.intro-feats { display: grid; grid-template-columns: 1fr 1fr; gap: 14px 22px; margin-top: 24px; }
.intro-feats li { display: flex; align-items: center; gap: 10px; font-size: 14.5px; color: var(--ink); font-weight: 500; }
.intro-feats svg { width: 18px; height: 18px; flex: none; color: var(--accent); }

/* ---------- 产品卡片 ---------- */
.product-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.product-card {
  background: var(--white); border: 1px solid var(--line); border-radius: var(--radius-lg);
  overflow: hidden; transition: transform .3s ease, box-shadow .3s ease;
}
.product-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.product-card .pc-img { position: relative; overflow: hidden; aspect-ratio: 4/3; }
.product-card .pc-img img { width: 100%; height: 100%; object-fit: cover; transition: transform .6s ease; }
.product-card:hover .pc-img img { transform: scale(1.06); }
.product-card .pc-img .tag { position: absolute; left: 14px; top: 14px; background: rgba(255, 255, 255, .92); }
.product-card .pc-body { padding: 22px 22px 24px; }
.product-card h3 { font-size: 19px; margin-bottom: 8px; }
.product-card h3 a:hover { color: var(--brand); }
.product-card p { font-size: 13.5px; color: var(--muted); margin-bottom: 14px; min-height: 60px; }
.product-card .pc-meta { display: flex; justify-content: space-between; align-items: center; border-top: 1px dashed var(--line); padding-top: 14px; font-size: 13px; }
.product-card .pc-meta span { color: var(--muted); }
.product-card .pc-meta a { color: var(--brand); font-weight: 700; }
.product-card .pc-meta a:hover { color: var(--accent); }

/* ---------- 优势模块 ---------- */
.adv-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 26px; }
.adv-item { background: var(--white); border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 34px 26px; transition: all .3s ease; }
.adv-item:hover { border-color: var(--brand); box-shadow: var(--shadow); transform: translateY(-4px); }
.adv-item .ai-icon { width: 56px; height: 56px; border-radius: 14px; background: var(--brand-soft); display: flex; align-items: center; justify-content: center; margin-bottom: 18px; }
.adv-item .ai-icon svg { width: 28px; height: 28px; stroke: var(--brand); }
.adv-item h3 { font-size: 17px; margin-bottom: 8px; }
.adv-item p { font-size: 13.5px; color: var(--muted); }

/* ---------- 应用领域 ---------- */
.app-strip { display: grid; grid-template-columns: repeat(4, 1fr); gap: 26px; }
.app-item {
  position: relative; border-radius: var(--radius-lg); overflow: hidden;
  aspect-ratio: 4/3; display: flex; align-items: flex-end;
}
.app-item img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; transition: transform .5s ease; }
.app-item:hover img { transform: scale(1.06); }
.app-item::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, rgba(6, 41, 78, 0) 35%, rgba(6, 41, 78, .82) 100%); }
.app-item .ai-label { position: relative; z-index: 2; padding: 0 20px 18px; color: #fff; }
.app-item .ai-label b { display: block; font-size: 18px; letter-spacing: 1px; }
.app-item .ai-label span { font-size: 12.5px; opacity: .82; }

/* ---------- 新闻卡片 ---------- */
.news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.news-card { background: var(--white); border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 26px; transition: all .3s ease; }
.news-card:hover { box-shadow: var(--shadow); transform: translateY(-4px); }
.news-card .nc-date { font-size: 12.5px; color: var(--muted); display: flex; align-items: center; gap: 8px; margin-bottom: 10px; }
.news-card .nc-date i { font-style: normal; width: 6px; height: 6px; border-radius: 50%; background: var(--accent); display: inline-block; }
.news-card h3 { font-size: 16.5px; line-height: 1.5; margin-bottom: 8px; }
.news-card p { font-size: 13.5px; color: var(--muted); }

/* ---------- CTA 条 ---------- */
.cta-band { background: linear-gradient(120deg, var(--brand-deep), var(--brand)); color: #fff; }
.cta-band .container { display: flex; align-items: center; justify-content: space-between; gap: 30px; padding-top: 46px; padding-bottom: 46px; flex-wrap: wrap; }
.cta-band h2 { color: #fff; font-size: 26px; letter-spacing: 1px; margin-bottom: 6px; }
.cta-band p { color: rgba(255, 255, 255, .8); font-size: 14.5px; }
.cta-phone { display: flex; align-items: center; gap: 14px; }
.cta-phone svg { width: 44px; height: 44px; stroke: #FFC078; }
.cta-phone small { display: block; font-size: 12px; color: rgba(255, 255, 255, .7); letter-spacing: 1px; }
.cta-phone b { font-size: 26px; color: #FFC078; letter-spacing: 1px; }

/* ---------- 页脚亮色Logo ---------- */
.footer .logo-text strong { color: #fff; }
.footer .logo-text em { color: rgba(255, 255, 255, .55); }

/* ---------- 页脚 ---------- */
.footer { background: var(--brand-deep); color: rgba(255, 255, 255, .72); font-size: 14px; }
.footer-main { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 44px; padding: 64px 0 44px; }
.footer h4 { color: #fff; font-size: 16px; margin-bottom: 20px; letter-spacing: 1px; position: relative; padding-bottom: 12px; }
.footer h4::after { content: ""; position: absolute; left: 0; bottom: 0; width: 30px; height: 2px; background: var(--accent); }
.footer-about p { font-size: 13.5px; line-height: 1.9; }
.footer-links li { margin-bottom: 10px; }
.footer-links a { color: rgba(255, 255, 255, .72); transition: color .2s, padding-left .2s; }
.footer-links a:hover { color: #FFC078; padding-left: 4px; }
.footer-contact li { display: flex; gap: 10px; margin-bottom: 14px; line-height: 1.7; }
.footer-contact svg { width: 16px; height: 16px; flex: none; margin-top: 4px; stroke: #FFC078; }
.footer-bottom { border-top: 1px solid rgba(255, 255, 255, .1); padding: 18px 0; font-size: 12.5px; color: rgba(255, 255, 255, .5); }
.footer-bottom .container { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; }

/* ---------- 内页横幅 ---------- */
.page-banner { position: relative; color: #fff; padding: 96px 0 84px; overflow: hidden; }
.page-banner img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.page-banner::after { content: ""; position: absolute; inset: 0; background: linear-gradient(110deg, rgba(6, 41, 78, .94), rgba(6, 41, 78, .7)); }
.page-banner .container { position: relative; z-index: 2; }
.page-banner h1 { color: #fff; font-size: 40px; letter-spacing: 2px; margin-bottom: 10px; }
.page-banner .crumb { font-size: 13.5px; color: rgba(255, 255, 255, .78); display: flex; gap: 8px; align-items: center; }
.page-banner .crumb a:hover { color: #FFC078; }
.page-banner .crumb i { font-style: normal; opacity: .5; }

/* ---------- 关于页：公司简介 ---------- */
.about-grid { display: grid; grid-template-columns: 1fr 1.08fr; gap: 54px; align-items: center; }
.about-media img { border-radius: var(--radius-lg); box-shadow: var(--shadow-lg); aspect-ratio: 4/3; object-fit: cover; }
.about-text h2 { font-size: 30px; margin-bottom: 20px; letter-spacing: 1px; }
.about-text p { font-size: 15px; margin-bottom: 14px; }
.about-text .quote { border-left: 4px solid var(--accent); background: var(--bg-soft); padding: 16px 20px; border-radius: 0 10px 10px 0; color: var(--ink); font-weight: 500; font-size: 14.5px; margin-top: 20px; }

/* ---------- 时间轴 ---------- */
.timeline { margin-top: 10px; }
.tl-row { display: grid; grid-template-columns: 150px 64px 1fr; }
.tl-year { text-align: right; padding-top: 2px; font-size: 15px; font-weight: 700; color: var(--brand); letter-spacing: .5px; }
.tl-axis { position: relative; }
.tl-dot {
  position: absolute; left: 50%; top: 0; transform: translate(-50%, -50%);
  width: 15px; height: 15px; border-radius: 50%;
  background: var(--white); border: 4px solid var(--accent);
}
.tl-line { position: absolute; left: calc(50% - 1px); top: 0; bottom: 0; width: 2px; background: var(--line); }
.tl-row:first-child .tl-line { top: 7px; }
.tl-row:last-child .tl-line { bottom: auto; height: 8px; }
.tl-content { padding: 0 0 40px 8px; }
.tl-content h3 { font-size: 17px; margin-bottom: 4px; }
.tl-content p { font-size: 13.5px; color: var(--muted); }

/* ---------- 价值卡片 ---------- */
.value-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.value-item { text-align: center; padding: 34px 22px; background: var(--white); border: 1px solid var(--line); border-radius: var(--radius-lg); transition: all .3s; }
.value-item:hover { border-color: var(--brand); box-shadow: var(--shadow); }
.value-item .vi-num { font-size: 30px; font-weight: 700; color: var(--brand-soft); }
.value-item .vi-num b { color: var(--accent); }
.value-item h3 { font-size: 17px; margin: 6px 0 8px; }
.value-item p { font-size: 13px; color: var(--muted); }

/* ---------- 资质 ---------- */
.cert-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.cert-item { display: flex; align-items: center; gap: 16px; background: var(--white); border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 22px 24px; transition: all .3s; }
.cert-item:hover { box-shadow: var(--shadow); border-color: var(--brand); }
.cert-item svg { width: 38px; height: 38px; flex: none; stroke: var(--brand); }
.cert-item h3 { font-size: 15.5px; margin-bottom: 2px; }
.cert-item p { font-size: 12.5px; color: var(--muted); }

/* ---------- 产品详情块 ---------- */
.product-block { display: grid; grid-template-columns: 1fr 1.1fr; gap: 48px; align-items: center; }
.product-block + .product-block { margin-top: 30px; }
.product-block.flip .pb-media { order: 2; }
.pb-media img { border-radius: var(--radius-lg); box-shadow: var(--shadow); aspect-ratio: 4/3; object-fit: cover; width: 100%; }
.pb-info h2 { font-size: 25px; margin-bottom: 10px; letter-spacing: 1px; }
.pb-info .pb-spec { font-size: 13px; color: var(--muted); margin-bottom: 14px; }
.pb-info p { font-size: 14.5px; margin-bottom: 18px; }
.pb-table { width: 100%; border-collapse: collapse; table-layout: fixed; font-size: 13px; }
.pb-table th, .pb-table td { border: 1px solid var(--line); padding: 9px 12px; text-align: left; }
.pb-table th { background: var(--bg-soft); color: var(--ink); font-weight: 700; width: 30%; }
.pb-table td { color: var(--text); }
.pb-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }

/* ---------- 新闻列表页 ---------- */
.news-filter { display: flex; gap: 10px; justify-content: center; margin-bottom: 40px; flex-wrap: wrap; }
.news-filter button { padding: 8px 22px; border-radius: 30px; border: 1px solid var(--line); font-size: 14px; color: var(--text); background: var(--white); transition: all .25s; }
.news-filter button:hover { border-color: var(--brand); color: var(--brand); }
.news-filter button.active { background: var(--brand); border-color: var(--brand); color: #fff; }
.news-list { max-width: 880px; margin: 0 auto; }
.news-row {
  display: grid; grid-template-columns: 92px 1fr; gap: 28px;
  background: var(--white); border: 1px solid var(--line); border-radius: var(--radius-lg);
  padding: 26px 30px; margin-bottom: 20px; transition: all .25s;
}
.news-row:hover { box-shadow: var(--shadow); border-color: var(--brand); }
.news-row .nr-date { text-align: center; border-right: 1px solid var(--line); padding-right: 28px; }
.news-row .nr-date b { display: block; font-size: 30px; color: var(--brand); line-height: 1.2; }
.news-row .nr-date span { font-size: 12.5px; color: var(--muted); }
.news-row h3 { font-size: 17.5px; margin-bottom: 8px; }
.news-row .nr-cat { display: inline-block; font-size: 11.5px; color: var(--accent); font-weight: 700; margin-bottom: 6px; letter-spacing: 1px; }
.news-row p { font-size: 13.5px; color: var(--muted); }

/* ---------- 联系页 ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1.25fr; gap: 44px; }
.contact-cards { display: grid; gap: 18px; align-content: start; }
.contact-card { display: flex; gap: 18px; background: var(--white); border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 24px; transition: all .25s; }
.contact-card:hover { box-shadow: var(--shadow); border-color: var(--brand); }
.contact-card .cc-icon { width: 52px; height: 52px; flex: none; border-radius: 12px; background: var(--brand-soft); display: flex; align-items: center; justify-content: center; }
.contact-card .cc-icon svg { width: 26px; height: 26px; stroke: var(--brand); }
.contact-card h3 { font-size: 16px; margin-bottom: 4px; }
.contact-card p { font-size: 13.5px; color: var(--muted); }
.contact-card b { font-size: 17px; color: var(--ink); }
.contact-note { background: var(--brand-soft); border-radius: var(--radius-lg); padding: 26px 28px; }
.contact-note h3 { font-size: 17px; margin-bottom: 12px; }
.contact-note ul li { position: relative; padding-left: 18px; margin-bottom: 8px; font-size: 14px; }
.contact-note ul li::before { content: ""; position: absolute; left: 0; top: 10px; width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }

/* ---------- 滚动显现 ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ---------- 返回顶部 ---------- */
#backTop {
  position: fixed; right: 26px; bottom: 26px; z-index: 90;
  width: 44px; height: 44px; border-radius: 10px;
  background: var(--brand); color: #fff; display: flex; align-items: center; justify-content: center;
  opacity: 0; visibility: hidden; transition: all .3s; box-shadow: var(--shadow-lg);
}
#backTop.show { opacity: 1; visibility: visible; }
#backTop:hover { background: var(--brand-dark); }
#backTop svg { width: 20px; height: 20px; stroke: #fff; }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .product-grid, .news-grid { grid-template-columns: repeat(2, 1fr); }
  .adv-grid { grid-template-columns: repeat(2, 1fr); }
  .app-strip { grid-template-columns: repeat(2, 1fr); }
  .value-grid { grid-template-columns: repeat(2, 1fr); }
  .cert-list { grid-template-columns: repeat(2, 1fr); }
  .footer-main { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 900px) {
  .hamburger { display: block; }
  .nav {
    position: fixed; top: 0; right: -320px; width: 300px; height: 100vh;
    background: #fff; flex-direction: column; align-items: stretch; gap: 4px;
    padding: 96px 26px 30px; box-shadow: -14px 0 40px rgba(6, 41, 78, .16);
    transition: right .35s ease; z-index: 200;
  }
  .nav.open { right: 0; }
  .nav a { font-size: 16px; padding: 14px 16px; border-radius: 10px; }
  .intro-grid, .about-grid { grid-template-columns: 1fr; gap: 36px; }
  .product-block { grid-template-columns: 1fr; gap: 26px; }
  .product-block.flip .pb-media { order: 0; }
  .contact-grid { grid-template-columns: 1fr; }
  .hero { min-height: 540px; }
  .hero h1 { font-size: 38px; }
  .stats .container { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(3)::before { display: none; }
}

@media (max-width: 640px) {
  .section { padding: 64px 0; }
  .section-head h2 { font-size: 25px; }
  .hero h1 { font-size: 30px; }
  .product-grid, .news-grid, .adv-grid, .app-strip, .value-grid, .cert-list { grid-template-columns: 1fr; }
  .footer-main { grid-template-columns: 1fr; gap: 32px; }
  .tl-row { grid-template-columns: 84px 44px 1fr; }
  .intro-media .badge { right: 8px; bottom: 16px; padding: 14px 16px; }
  .intro-media .badge b { font-size: 22px; }
  .topbar .tb-right { display: none; }
  .news-row { grid-template-columns: 70px 1fr; gap: 18px; padding: 20px; }
  .news-row .nr-date { padding-right: 18px; }
  .news-row .nr-date b { font-size: 24px; }
  .page-banner { padding: 70px 0 60px; }
  .page-banner h1 { font-size: 30px; }
  .cta-band .container { justify-content: center; text-align: center; }
}