/* ============================================================
   恒泰保温材料有限公司 · 官网样式
   设计体系：工业深蓝 × 暖橙强调；思源黑体本地字体
   ============================================================ */

/* ---------- 字体（本地化） ---------- */
@font-face {
  font-family: 'Noto Sans SC';
  src: url('../fonts/NotoSansSC-Regular.woff2') format('woff2');
  font-weight: 400;
  font-display: swap;
}
@font-face {
  font-family: 'Noto Sans SC';
  src: url('../fonts/NotoSansSC-Medium.woff2') format('woff2');
  font-weight: 500;
  font-display: swap;
}
@font-face {
  font-family: 'Noto Sans SC';
  src: url('../fonts/NotoSansSC-Bold.woff2') format('woff2');
  font-weight: 700;
  font-display: swap;
}

/* ---------- 设计变量 ---------- */
:root {
  --brand: #0E4A78;
  --brand-2: #1166A8;
  --brand-dark: #092F4E;
  --brand-deep: #061F33;
  --accent: #E8862D;
  --accent-2: #F2A33C;
  --ink: #17232E;
  --muted: #5D6C7A;
  --bg: #F5F8FA;
  --card: #FFFFFF;
  --line: #E3EAF0;
  --radius: 10px;
  --shadow: 0 8px 24px rgba(9, 47, 78, 0.08);
  --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; scroll-padding-top: 84px; }
body {
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--brand); text-decoration: none; }
ul { list-style: none; }
.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }

h1, h2, h3, h4 { font-weight: 700; line-height: 1.3; color: var(--brand-dark); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 6px;
  font-size: 15px;
  font-weight: 500;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.2s ease;
  font-family: var(--font);
}
.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { background: var(--brand-2); }
.btn-accent { background: var(--accent); color: #fff; }
.btn-accent:hover { background: #D0731C; }
.btn-outline { border-color: var(--brand); color: var(--brand); background: transparent; }
.btn-outline:hover { background: var(--brand); color: #fff; }
.btn-light { border-color: rgba(255,255,255,.6); color: #fff; background: transparent; }
.btn-light:hover { background: #fff; color: var(--brand-dark); }

/* ---------- 通用区块 ---------- */
.section { padding: 84px 0; }
.section-alt { background: var(--card); }
.section-head { max-width: 720px; margin-bottom: 48px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.kicker {
  display: inline-block;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 2px;
  color: var(--accent);
  margin-bottom: 10px;
}
.section-head h2 { font-size: 32px; margin-bottom: 14px; }
.section-head p { color: var(--muted); font-size: 15px; }
.head-line { width: 46px; height: 3px; background: var(--accent); border-radius: 2px; margin-top: 16px; }
.center .head-line { margin-left: auto; margin-right: auto; }

/* ---------- 头部导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.96);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
  transition: box-shadow 0.25s ease;
}
.site-header.scrolled { box-shadow: 0 4px 18px rgba(9,47,78,0.10); }
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand img { width: 42px; height: 42px; }
.brand-name { font-size: 20px; font-weight: 700; color: var(--brand-dark); line-height: 1.2; }
.brand-name small { display: block; font-size: 11px; font-weight: 500; letter-spacing: 2px; color: var(--muted); }
.main-nav ul { display: flex; gap: 34px; }
.main-nav a {
  display: block;
  padding: 6px 0;
  font-size: 15px;
  font-weight: 500;
  color: var(--ink);
  position: relative;
  transition: color 0.2s;
}
.main-nav a::after {
  content: '';
  position: absolute;
  left: 0; bottom: 0;
  width: 0; height: 3px;
  background: var(--accent);
  border-radius: 2px;
  transition: width 0.25s ease;
}
.main-nav a:hover, .main-nav a.active { color: var(--brand); }
.main-nav a:hover::after, .main-nav a.active::after { width: 100%; }
.header-phone { display: flex; align-items: center; gap: 8px; font-size: 15px; font-weight: 700; color: var(--brand); }
.header-phone svg { width: 18px; height: 18px; }
.nav-toggle { display: none; background: none; border: 0; width: 40px; height: 40px; cursor: pointer; position: relative; z-index: 130; }
.nav-toggle span {
  position: absolute; left: 8px; right: 8px; height: 2px;
  background: var(--brand-dark); border-radius: 2px; transition: all 0.25s ease;
}
.nav-toggle span:nth-child(1) { top: 13px; }
.nav-toggle span:nth-child(2) { top: 19px; }
.nav-toggle span:nth-child(3) { top: 25px; }
body.nav-open .nav-toggle span:nth-child(1) { top: 19px; transform: rotate(45deg); }
body.nav-open .nav-toggle span:nth-child(2) { opacity: 0; }
body.nav-open .nav-toggle span:nth-child(3) { top: 19px; transform: rotate(-45deg); }

/* ---------- Hero（首页） ---------- */
.hero {
  position: relative;
  min-height: 560px;
  display: flex;
  align-items: center;
  color: #fff;
  overflow: hidden;
  background: var(--brand-deep);
}
.hero-bg { position: absolute; inset: 0; }
.hero-bg img { width: 100%; height: 100%; object-fit: cover; opacity: 0.55; }
.hero-bg::after {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(100deg, rgba(6,31,51,0.92) 0%, rgba(6,31,51,0.55) 55%, rgba(6,31,51,0.25) 100%);
}
.hero-content { position: relative; z-index: 2; max-width: 640px; padding: 80px 0; }
.hero-tag {
  display: inline-block;
  padding: 6px 14px;
  border: 1px solid rgba(255,255,255,0.4);
  border-radius: 20px;
  font-size: 13px;
  letter-spacing: 2px;
  margin-bottom: 22px;
  color: #EDF4FB;
}
.hero-content h1 { font-size: 44px; color: #fff; margin-bottom: 18px; line-height: 1.25; }
.hero-content h1 em { font-style: normal; color: var(--accent-2); }
.hero-content p { font-size: 16px; color: rgba(255,255,255,0.88); margin-bottom: 34px; max-width: 520px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }

/* 数据条 */
.stats-band { background: var(--brand); color: #fff; }
.stats-band .container { display: grid; grid-template-columns: repeat(4, 1fr); }
.stat-item { padding: 34px 24px; text-align: center; border-left: 1px solid rgba(255,255,255,0.14); }
.stat-item:first-child { border-left: 0; }
.stat-num { font-size: 40px; font-weight: 700; color: #fff; line-height: 1.2; }
.stat-num small { font-size: 18px; font-weight: 500; color: var(--accent-2); margin-left: 2px; }
.stat-label { font-size: 14px; color: rgba(255,255,255,0.78); margin-top: 6px; }

/* ---------- 首页简介 ---------- */
.intro-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.intro-media { position: relative; }
.intro-media img { border-radius: var(--radius); width: 100%; height: 400px; object-fit: cover; }
.intro-media .badge-card {
  position: absolute; right: -18px; bottom: -20px;
  background: var(--brand-deep); color: #fff;
  padding: 20px 26px; border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.badge-card .b-num { font-size: 28px; font-weight: 700; color: var(--accent-2); }
.badge-card .b-txt { font-size: 13px; color: rgba(255,255,255,0.8); }
.intro-copy .lead { font-size: 17px; color: var(--brand-dark); font-weight: 500; margin-bottom: 16px; }
.intro-copy p { color: var(--muted); margin-bottom: 14px; }
.intro-points { margin: 22px 0 30px; display: grid; gap: 12px; }
.intro-points li { display: flex; gap: 10px; align-items: flex-start; font-size: 15px; color: var(--ink); }
.intro-points .dot { flex: none; width: 18px; height: 18px; margin-top: 4px; border-radius: 50%; background: rgba(232,134,45,0.16); display: inline-flex; align-items: center; justify-content: center; }
.intro-points .dot::after { content: ''; width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }

/* ---------- 产品卡片 ---------- */
.product-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.product-card {
  background: var(--card);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  display: flex;
  flex-direction: column;
}
.product-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.product-card .thumb { position: relative; aspect-ratio: 4 / 3; overflow: hidden; }
.product-card .thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s ease; }
.product-card:hover .thumb img { transform: scale(1.05); }
.product-card .tag {
  position: absolute; top: 14px; left: 14px;
  background: var(--accent); color: #fff;
  font-size: 12px; font-weight: 500;
  padding: 4px 12px; border-radius: 14px;
}
.product-card .body { padding: 22px 24px 26px; display: flex; flex-direction: column; flex: 1; }
.product-card h3 { font-size: 19px; margin-bottom: 8px; }
.product-card .p-en { font-size: 12px; letter-spacing: 1px; color: var(--muted); margin-bottom: 12px; }
.product-card p { font-size: 14px; color: var(--muted); margin-bottom: 18px; flex: 1; }
.product-card .meta { display: flex; gap: 14px; font-size: 13px; color: var(--brand); border-top: 1px dashed var(--line); padding-top: 14px; }
.product-card .meta b { color: var(--ink); font-weight: 500; }
.card-more { font-size: 14px; font-weight: 500; color: var(--accent); }

/* ---------- 应用场景 ---------- */
.app-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.app-card {
  position: relative; border-radius: var(--radius); overflow: hidden;
  aspect-ratio: 3 / 4; display: block;
}
.app-card img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s ease; }
.app-card:hover img { transform: scale(1.06); }
.app-card::after {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(6,31,51,0) 35%, rgba(6,31,51,0.82) 100%);
}
.app-card .cap { position: absolute; left: 18px; right: 18px; bottom: 16px; z-index: 2; color: #fff; }
.app-card .cap h4 { color: #fff; font-size: 17px; margin-bottom: 4px; }
.app-card .cap p { font-size: 12px; color: rgba(255,255,255,0.75); }

/* ---------- 资质条 ---------- */
.cert-band { background: var(--brand-deep); color: #fff; }
.cert-band .section-head h2 { color: #fff; }
.cert-band .section-head p { color: rgba(255,255,255,0.7); }
.cert-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 18px; }
.cert-item {
  border: 1px solid rgba(255,255,255,0.16);
  border-radius: var(--radius);
  padding: 22px 16px;
  text-align: center;
  transition: background 0.2s;
}
.cert-item:hover { background: rgba(255,255,255,0.06); }
.cert-item svg { width: 34px; height: 34px; margin: 0 auto 12px; display: block; }
.cert-item h4 { color: #fff; font-size: 15px; margin-bottom: 4px; }
.cert-item p { font-size: 12px; color: rgba(255,255,255,0.62); }

/* ---------- 首页新闻 ---------- */
.news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.news-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px;
  display: flex;
  flex-direction: column;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.news-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.news-card .date { font-size: 13px; color: var(--accent); font-weight: 500; margin-bottom: 10px; }
.news-card h3 { font-size: 18px; margin-bottom: 10px; line-height: 1.45; }
.news-card p { font-size: 14px; color: var(--muted); margin-bottom: 18px; flex: 1; }

/* ---------- CTA 横幅 ---------- */
.cta-band {
  position: relative; overflow: hidden;
  background: linear-gradient(100deg, var(--brand-dark), var(--brand));
  color: #fff; padding: 64px 0;
}
.cta-band .container { display: flex; align-items: center; justify-content: space-between; gap: 32px; flex-wrap: wrap; }
.cta-band h2 { color: #fff; font-size: 28px; margin-bottom: 8px; }
.cta-band p { color: rgba(255,255,255,0.8); }

/* ---------- 页头横幅（内页） ---------- */
.page-hero {
  background: linear-gradient(100deg, var(--brand-deep), var(--brand));
  color: #fff;
  padding: 64px 0;
}
.page-hero h1 { color: #fff; font-size: 34px; margin-bottom: 10px; }
.page-hero p { color: rgba(255,255,255,0.78); max-width: 640px; }
.crumbs { font-size: 13px; color: rgba(255,255,255,0.6); margin-bottom: 14px; }
.crumbs a { color: rgba(255,255,255,0.85); }
.crumbs span { margin: 0 6px; }

/* ---------- 关于页 ---------- */
.about-lead { display: grid; grid-template-columns: 1.05fr 1fr; gap: 56px; align-items: center; }
.about-lead img { border-radius: var(--radius); width: 100%; height: 420px; object-fit: cover; }
.about-lead .lead { font-size: 18px; font-weight: 500; color: var(--brand-dark); margin-bottom: 16px; line-height: 1.6; }
.about-lead p { color: var(--muted); margin-bottom: 14px; font-size: 15px; }

/* 时间轴：grid 三列（时间 / 轴 / 内容），圆点由布局引擎居中 */
.timeline { display: grid; gap: 0; max-width: 860px; margin: 0 auto; }
.tl-row {
  display: grid;
  grid-template-columns: 130px 56px 1fr;
  padding-bottom: 34px;
  position: relative;
}
.tl-row:last-child { padding-bottom: 0; }
.tl-time {
  text-align: right;
  padding-right: 18px;
  font-size: 15px;
  font-weight: 700;
  color: var(--brand);
  padding-top: 4px;
}
.tl-axis { position: relative; justify-self: center; }
.tl-dot {
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid #fff;
  box-shadow: 0 0 0 2px var(--accent);
  position: relative;
  z-index: 1;
  margin-top: 5px;
}
.tl-axis::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 24px;
  bottom: -10px;
  width: 2px;
  transform: translateX(-50%);
  background: var(--line);
}
.tl-row:last-child .tl-axis::before { display: none; }
.tl-body { padding-left: 6px; }
.tl-body h3 { font-size: 17px; margin-bottom: 6px; }
.tl-body p { font-size: 14px; color: var(--muted); max-width: 560px; }

/* 价值观 */
.values-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.value-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-top: 3px solid var(--brand);
  border-radius: var(--radius);
  padding: 30px 24px;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.value-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.value-card .v-icon { width: 46px; height: 46px; border-radius: 12px; background: rgba(14,74,120,0.08); display: flex; align-items: center; justify-content: center; margin-bottom: 16px; }
.value-card .v-icon svg { width: 24px; height: 24px; stroke: var(--brand); }
.value-card h3 { font-size: 17px; margin-bottom: 8px; }
.value-card p { font-size: 14px; color: var(--muted); }

/* 资质列表 */
.qual-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.qual-item {
  display: flex; gap: 18px; align-items: flex-start;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px;
}
.qual-item .q-icon { flex: none; width: 46px; height: 46px; border-radius: 50%; background: rgba(232,134,45,0.12); display: flex; align-items: center; justify-content: center; }
.qual-item .q-icon svg { width: 24px; height: 24px; stroke: var(--accent); }
.qual-item h3 { font-size: 16px; margin-bottom: 4px; }
.qual-item p { font-size: 13px; color: var(--muted); }

/* ---------- 产品页 ---------- */
.product-detail {
  display: grid;
  grid-template-columns: 480px 1fr;
  gap: 48px;
  align-items: start;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 36px;
  margin-bottom: 36px;
  scroll-margin-top: 100px;
}
.product-detail .pd-img { border-radius: var(--radius); overflow: hidden; aspect-ratio: 4 / 3; }
.product-detail .pd-img img { width: 100%; height: 100%; object-fit: cover; }
.pd-head { display: flex; align-items: center; gap: 14px; margin-bottom: 10px; }
.pd-head h2 { font-size: 26px; }
.pd-head .pd-tag { background: var(--accent); color: #fff; font-size: 12px; font-weight: 500; padding: 4px 12px; border-radius: 14px; }
.pd-en { font-size: 13px; letter-spacing: 1px; color: var(--muted); margin-bottom: 16px; }
.pd-desc { color: var(--muted); font-size: 15px; margin-bottom: 22px; }
.spec-table { width: 100%; border-collapse: collapse; font-size: 14px; table-layout: fixed; }
.spec-table caption {
  text-align: left; font-weight: 700; color: var(--brand-dark);
  font-size: 15px; margin-bottom: 10px;
}
.spec-table th, .spec-table td { padding: 10px 14px; border: 1px solid var(--line); text-align: left; }
.spec-table th { width: 34%; background: #F1F6FA; color: var(--brand-dark); font-weight: 500; }
.spec-table td { color: var(--ink); }

/* ---------- 新闻页 ---------- */
.news-list { display: grid; gap: 20px; max-width: 980px; margin: 0 auto; }
.news-row {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 30px;
  display: grid;
  grid-template-columns: 150px 1fr auto;
  gap: 28px;
  align-items: center;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.news-row:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.news-row .n-date { font-size: 14px; color: var(--accent); font-weight: 700; }
.news-row .n-date small { display: block; font-size: 12px; color: var(--muted); font-weight: 400; margin-top: 2px; }
.news-row h3 { font-size: 18px; margin-bottom: 6px; }
.news-row p { font-size: 14px; color: var(--muted); overflow: hidden; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }
.news-row .arrow { font-size: 20px; color: var(--brand); }

/* 文章页 */
.article { max-width: 860px; margin: 0 auto; }
.article .art-head { text-align: center; margin-bottom: 40px; }
.article .art-head h1 { font-size: 30px; margin-bottom: 14px; }
.article .art-meta { font-size: 14px; color: var(--muted); }
.article .art-meta span { margin: 0 10px; }
.article figure { margin: 28px 0; }
.article figure img { border-radius: var(--radius); width: 100%; }
.article figcaption { font-size: 13px; color: var(--muted); text-align: center; margin-top: 10px; }
.article h2 { font-size: 22px; margin: 32px 0 14px; }
.article p { margin-bottom: 18px; color: #2A3A48; }
.article ul { margin: 0 0 18px; padding-left: 0; }
.article ul li { padding-left: 20px; position: relative; margin-bottom: 8px; color: #2A3A48; }
.article ul li::before { content: ''; position: absolute; left: 4px; top: 11px; width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }
.art-nav {
  margin-top: 44px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  gap: 20px;
  font-size: 14px;
}

/* ---------- 联系页 ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.contact-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 30px;
}
.contact-card h3 { font-size: 18px; margin-bottom: 20px; display: flex; align-items: center; gap: 10px; }
.contact-card h3 svg { width: 20px; height: 20px; stroke: var(--accent); }
.contact-card .c-line { display: flex; gap: 14px; padding: 12px 0; border-bottom: 1px dashed var(--line); font-size: 15px; }
.contact-card .c-line:last-child { border-bottom: 0; }
.contact-card .c-label { flex: none; width: 64px; color: var(--muted); font-size: 14px; }
.contact-card .c-val { color: var(--ink); }
.contact-card .c-val b { color: var(--brand-dark); }
.promise-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.promise-item { text-align: center; padding: 30px 20px; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); }
.promise-item .p-icon { width: 52px; height: 52px; margin: 0 auto 14px; border-radius: 50%; background: rgba(14,74,120,0.08); display: flex; align-items: center; justify-content: center; }
.promise-item .p-icon svg { width: 26px; height: 26px; stroke: var(--brand); }
.promise-item h3 { font-size: 16px; margin-bottom: 6px; }
.promise-item p { font-size: 13px; color: var(--muted); }

/* ---------- 页脚 ---------- */
.site-footer { background: var(--brand-deep); color: rgba(255,255,255,0.7); }
.footer-main {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 44px;
  padding: 64px 0 40px;
}
.footer-brand .brand-name { color: #fff; }
.footer-brand .brand-name small { color: rgba(255,255,255,0.5); }
.footer-brand p { font-size: 14px; margin-top: 16px; max-width: 300px; }
.footer-col h4 { color: #fff; font-size: 15px; margin-bottom: 18px; }
.footer-col a, .footer-col li { display: block; font-size: 14px; color: rgba(255,255,255,0.68); margin-bottom: 10px; transition: color 0.2s; }
.footer-col a:hover { color: var(--accent-2); }
.footer-contact li { display: flex; gap: 10px; align-items: flex-start; margin-bottom: 12px; }
.footer-contact svg { flex: none; width: 16px; height: 16px; margin-top: 4px; stroke: var(--accent-2); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.12);
  padding: 20px 0;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 13px;
}
.footer-bottom a { color: rgba(255,255,255,0.6); }

/* ---------- 滚动显现（克制） ---------- */
.reveal { opacity: 0; transform: translateY(14px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .app-grid { grid-template-columns: repeat(2, 1fr); }
  .cert-grid { grid-template-columns: repeat(3, 1fr); gap: 14px; }
  .values-grid { grid-template-columns: repeat(2, 1fr); }
  .qual-grid { grid-template-columns: repeat(2, 1fr); }
  .product-detail { grid-template-columns: 1fr; padding: 26px; }
  .intro-grid, .about-lead { grid-template-columns: 1fr; gap: 40px; }
  .footer-main { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .news-row { grid-template-columns: 120px 1fr auto; }
}

@media (max-width: 768px) {
  .section { padding: 56px 0; }
  .section-head h2 { font-size: 26px; }
  .hero { min-height: 480px; }
  .hero-content h1 { font-size: 32px; }
  .stats-band .container { grid-template-columns: repeat(2, 1fr); }
  .stat-item { border-left: 0; border-bottom: 1px solid rgba(255,255,255,0.14); }
  .header-phone { display: none; }
  .nav-toggle { display: block; }
  .main-nav {
    position: fixed;
    top: 72px; left: 0; right: 0;
    background: #fff;
    border-bottom: 1px solid var(--line);
    box-shadow: 0 18px 30px rgba(9,47,78,0.12);
    padding: 12px 24px 24px;
    transform: translateY(-12px);
    opacity: 0;
    visibility: hidden;
    transition: all 0.25s ease;
  }
  body.nav-open .main-nav { transform: none; opacity: 1; visibility: visible; }
  .main-nav ul { flex-direction: column; gap: 4px; }
  .main-nav a { padding: 12px 4px; font-size: 16px; border-bottom: 1px solid var(--line); }
  .main-nav a::after { display: none; }
  .product-grid, .news-grid, .promise-grid { grid-template-columns: 1fr; }
  .app-grid { grid-template-columns: 1fr 1fr; }
  .tl-row { grid-template-columns: 96px 40px 1fr; }
  .timeline { max-width: 100%; }
  .news-row { grid-template-columns: 1fr; gap: 8px; }
  .news-row .arrow { display: none; }
  .article .art-head h1 { font-size: 24px; }
  .footer-main { grid-template-columns: 1fr; gap: 32px; }
  .intro-media .badge-card { right: 8px; bottom: -14px; }
}

@media (max-width: 480px) {
  .app-grid { grid-template-columns: 1fr; }
  .cert-grid { grid-template-columns: repeat(2, 1fr); }
  .values-grid, .qual-grid { grid-template-columns: 1fr; }
  .hero-content h1 { font-size: 28px; }
  .cta-band .container { flex-direction: column; align-items: flex-start; }
}