/* ==========================================================
   西藏志成气体有限公司 — 企业门户网站
   Design: 深蓝工业风（信任蓝 + 安全橙 CTA）
   ========================================================== */

:root {
  --primary: #0b4a8b;
  --primary-dark: #08365f;
  --primary-deep: #0a2e52;
  --accent: #0fa3e0;
  --accent-soft: #e3f4fc;
  --cta: #f97316;
  --cta-dark: #ea6a0a;
  --bg: #f5f8fc;
  --surface: #ffffff;
  --text: #1f2d3d;
  --muted: #5b6b7f;
  --border: #e3eaf3;
  --shadow-sm: 0 2px 10px rgba(10, 46, 82, .07);
  --shadow-md: 0 10px 30px rgba(10, 46, 82, .12);
  --shadow-lg: 0 24px 60px rgba(10, 46, 82, .18);
  --radius: 14px;
  --radius-sm: 10px;
  --nav-h: 76px;
  --font: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", system-ui, -apple-system, "Segoe UI", sans-serif;
}

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

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background: var(--surface);
  -webkit-font-smoothing: antialiased;
}

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

a { color: inherit; text-decoration: none; }

ul { list-style: none; }

button { font-family: inherit; }

.container {
  width: min(1200px, 92%);
  margin: 0 auto;
}

/* ---------- 顶部信息条 ---------- */
.topbar {
  background: var(--primary-deep);
  color: rgba(255, 255, 255, .85);
  font-size: 13px;
}

.topbar-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: 38px;
  gap: 16px;
  flex-wrap: wrap;
}

.topbar-group {
  display: flex;
  align-items: center;
  gap: 22px;
  flex-wrap: wrap;
}

.topbar-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
}

.topbar-item svg { width: 14px; height: 14px; opacity: .8; flex: none; }

.topbar-item strong { color: #fff; font-weight: 600; }

.topbar a:hover { color: #fff; }

/* ---------- 头部导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, .96);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow .25s ease;
}

.site-header.scrolled { box-shadow: var(--shadow-sm); }

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-h);
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: none;
}

.brand-logo {
  width: 46px;
  height: 46px;
  flex: none;
  display: grid;
  place-items: center;
}

.brand-text { line-height: 1.25; }

.brand-text .brand-name,
.brand-text .brand-sub { display: block; }

.brand-name {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary-deep);
  letter-spacing: 1px;
}

.brand-sub {
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 2.5px;
  text-transform: uppercase;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  display: block;
  padding: 10px 16px;
  font-size: 15.5px;
  font-weight: 500;
  color: var(--text);
  border-radius: 8px;
  position: relative;
  transition: color .2s ease, background-color .2s ease;
  cursor: pointer;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 4px;
  height: 2.5px;
  border-radius: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .25s ease;
}

.nav-link:hover { color: var(--primary); }

.nav-link:hover::after,
.nav-link.active::after { transform: scaleX(1); }

.nav-link.active { color: var(--primary); font-weight: 600; }

.header-cta { flex: none; }

/* 移动端菜单按钮 */
.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fff;
  cursor: pointer;
  place-items: center;
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--primary-deep);
  border-radius: 2px;
  position: relative;
  transition: background .2s ease;
}

.nav-toggle span::before,
.nav-toggle span::after {
  content: "";
  position: absolute;
  left: 0;
  width: 20px;
  height: 2px;
  background: var(--primary-deep);
  border-radius: 2px;
  transition: transform .25s ease, top .25s ease;
}

.nav-toggle span::before { top: -6px; }
.nav-toggle span::after { top: 6px; }

.nav-open .nav-toggle span { background: transparent; }
.nav-open .nav-toggle span::before { top: 0; transform: rotate(45deg); }
.nav-open .nav-toggle span::after { top: 0; transform: rotate(-45deg); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 999px;
  font-size: 15.5px;
  font-weight: 600;
  letter-spacing: .5px;
  border: none;
  cursor: pointer;
  transition: background-color .25s ease, color .25s ease, box-shadow .25s ease, border-color .25s ease;
}

.btn svg { width: 17px; height: 17px; }

.btn-primary {
  background: var(--cta);
  color: #fff;
  box-shadow: 0 8px 22px rgba(249, 115, 22, .35);
}

.btn-primary:hover { background: var(--cta-dark); box-shadow: 0 10px 26px rgba(249, 115, 22, .45); }

.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 1.5px solid rgba(11, 74, 139, .4);
}

.btn-outline:hover { border-color: var(--primary); background: rgba(11, 74, 139, .05); }

.btn-light {
  background: rgba(255, 255, 255, .14);
  color: #fff;
  border: 1.5px solid rgba(255, 255, 255, .55);
  backdrop-filter: blur(4px);
}

.btn-light:hover { background: rgba(255, 255, 255, .24); }

.btn-lg { padding: 15px 36px; font-size: 16.5px; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 640px;
  display: flex;
  align-items: center;
  color: #fff;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: url("../img/hero.png") center / cover no-repeat;
  transform: scale(1.04);
  animation: heroZoom 18s ease-in-out infinite alternate;
}

@keyframes heroZoom {
  from { transform: scale(1.02); }
  to { transform: scale(1.1); }
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(100deg, rgba(8, 40, 74, .88) 8%, rgba(10, 52, 96, .62) 46%, rgba(10, 52, 96, .18) 100%);
}

.hero-inner {
  position: relative;
  z-index: 2;
  padding: 110px 0 90px;
  max-width: 720px;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 16px;
  border-radius: 999px;
  background: rgba(255, 255, 255, .12);
  border: 1px solid rgba(255, 255, 255, .3);
  font-size: 13.5px;
  letter-spacing: 2px;
  margin-bottom: 26px;
  backdrop-filter: blur(4px);
}

.hero-title {
  font-size: clamp(34px, 5vw, 56px);
  font-weight: 700;
  line-height: 1.22;
  letter-spacing: 2px;
  margin-bottom: 20px;
  text-shadow: 0 4px 24px rgba(0, 0, 0, .3);
}

.hero-title em {
  font-style: normal;
  color: #ffd9b8;
  background: linear-gradient(90deg, #ffb26b, #ff8f3c);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: clamp(15px, 1.6vw, 18px);
  color: rgba(255, 255, 255, .88);
  max-width: 560px;
  margin-bottom: 38px;
}

.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }

.hero-badges {
  display: flex;
  gap: 26px;
  margin-top: 54px;
  flex-wrap: wrap;
}

.hero-badge {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: rgba(255, 255, 255, .85);
}

.hero-badge svg {
  width: 34px;
  height: 34px;
  padding: 7px;
  border-radius: 50%;
  background: rgba(255, 255, 255, .14);
  border: 1px solid rgba(255, 255, 255, .28);
  flex: none;
}

/* ---------- 数据条 ---------- */
.stats {
  position: relative;
  z-index: 5;
  margin-top: -64px;
}

.stats-card {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  overflow: hidden;
}

.stat {
  padding: 30px 20px;
  text-align: center;
  border-left: 1px solid var(--border);
}

.stat:first-child { border-left: none; }

.stat-num {
  font-size: clamp(28px, 3vw, 40px);
  font-weight: 700;
  color: var(--primary);
  line-height: 1.15;
  font-variant-numeric: tabular-nums;
}

.stat-num small { font-size: .5em; font-weight: 600; margin-left: 2px; color: var(--accent); }

.stat-label { font-size: 14px; color: var(--muted); margin-top: 6px; }

/* ---------- 通用 Section ---------- */
.section { padding: 88px 0; }

.section.bg { background: var(--bg); }

.section-head { max-width: 680px; margin: 0 auto 52px; text-align: center; }

.section-kicker {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 4px;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(26px, 3.2vw, 38px);
  font-weight: 700;
  color: var(--primary-deep);
  line-height: 1.3;
  letter-spacing: 1px;
}

.section-title::after {
  content: "";
  display: block;
  width: 56px;
  height: 3.5px;
  border-radius: 3px;
  margin: 18px auto 0;
  background: linear-gradient(90deg, var(--accent), var(--primary));
}

.section-sub { color: var(--muted); margin-top: 16px; font-size: 15.5px; }

/* ---------- 公司简介 ---------- */
.about-split {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 64px;
  align-items: center;
}

.about-media { position: relative; }

.about-media .media-main {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.about-media .media-main img { width: 100%; height: 440px; object-fit: cover; transition: transform .6s ease; }

.about-media:hover .media-main img { transform: scale(1.04); }

.media-float {
  position: absolute;
  right: -28px;
  bottom: -34px;
  background: var(--primary);
  color: #fff;
  border-radius: var(--radius-sm);
  padding: 22px 28px;
  box-shadow: var(--shadow-md);
  text-align: center;
  min-width: 180px;
}

.media-float .num { font-size: 34px; font-weight: 700; line-height: 1.1; }

.media-float .num small { font-size: 15px; font-weight: 500; }

.media-float .cap { font-size: 13px; color: rgba(255, 255, 255, .8); letter-spacing: 2px; }

.about-body .section-kicker { margin-bottom: 10px; }

.about-body h2 {
  font-size: clamp(24px, 2.6vw, 32px);
  color: var(--primary-deep);
  line-height: 1.4;
  margin-bottom: 18px;
}

.about-body p { color: var(--muted); margin-bottom: 14px; }

.about-body p strong { color: var(--text); }

.check-list { margin: 24px 0 30px; display: grid; grid-template-columns: 1fr 1fr; gap: 12px 24px; }

.check-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 15px;
  color: var(--text);
}

.check-list svg {
  width: 20px;
  height: 20px;
  flex: none;
  margin-top: 3px;
  color: var(--accent);
}

/* ---------- 产品卡片 ---------- */
.product-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 26px;
}

.product-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  transition: transform .3s ease, box-shadow .3s ease, border-color .3s ease;
  display: flex;
  flex-direction: column;
}

.product-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-color: rgba(15, 163, 224, .45);
}

.product-thumb {
  position: relative;
  overflow: hidden;
  aspect-ratio: 4 / 3;
}

.product-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .5s ease;
}

.product-card:hover .product-thumb img { transform: scale(1.07); }

.product-thumb .tag {
  position: absolute;
  top: 12px;
  left: 12px;
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  color: #fff;
  background: rgba(11, 74, 139, .85);
  backdrop-filter: blur(4px);
  letter-spacing: 1px;
}

.product-thumb .tag.medical { background: rgba(15, 163, 224, .92); }
.product-thumb .tag.liquid { background: rgba(13, 148, 136, .92); }
.product-thumb .tag.special { background: rgba(124, 58, 237, .88); }

.product-body { padding: 20px 22px 24px; flex: 1; display: flex; flex-direction: column; }

.product-name {
  font-size: 18.5px;
  font-weight: 600;
  color: var(--primary-deep);
  margin-bottom: 8px;
}

.product-desc {
  font-size: 14px;
  color: var(--muted);
  flex: 1;
  margin-bottom: 16px;
}

.product-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
}

.product-more svg { width: 15px; height: 15px; transition: transform .25s ease; }

.product-card:hover .product-more svg { transform: translateX(4px); }

.product-filter {
  display: flex;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.filter-btn {
  padding: 9px 24px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--muted);
  font-size: 14.5px;
  cursor: pointer;
  transition: all .25s ease;
}

.filter-btn:hover { color: var(--primary); border-color: var(--primary); }

.filter-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
  box-shadow: 0 6px 16px rgba(11, 74, 139, .3);
}

.product-card.hide { display: none; }

/* ---------- 应用领域 ---------- */
.industry-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.icon-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px 24px;
  text-align: center;
  cursor: pointer;
  transition: transform .3s ease, box-shadow .3s ease, border-color .3s ease;
}

.icon-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
  border-color: rgba(15, 163, 224, .45);
}

.icon-ring {
  width: 64px;
  height: 64px;
  margin: 0 auto 18px;
  border-radius: 18px;
  display: grid;
  place-items: center;
  background: var(--accent-soft);
  color: var(--primary);
  transition: background-color .3s ease, color .3s ease;
}

.icon-card:hover .icon-ring { background: var(--primary); color: #fff; }

.icon-ring svg { width: 30px; height: 30px; }

.icon-card h3 { font-size: 17px; color: var(--primary-deep); margin-bottom: 8px; }

.icon-card p { font-size: 13.5px; color: var(--muted); }

/* ---------- 资质/质量带 ---------- */
.quality-band {
  position: relative;
  color: #fff;
  overflow: hidden;
}

.quality-band .band-bg {
  position: absolute;
  inset: 0;
  background: url("../img/lab.png") center / cover no-repeat fixed;
}

.quality-band::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(95deg, rgba(8, 40, 74, .93) 20%, rgba(11, 74, 139, .72));
}

.band-inner {
  position: relative;
  z-index: 2;
  padding: 92px 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.band-inner h2 {
  font-size: clamp(24px, 2.8vw, 34px);
  line-height: 1.4;
  margin-bottom: 18px;
}

.band-inner .lead { color: rgba(255, 255, 255, .85); margin-bottom: 28px; }

.cert-list { display: grid; gap: 14px; }

.cert-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, .08);
  border: 1px solid rgba(255, 255, 255, .16);
  backdrop-filter: blur(6px);
  font-size: 14.5px;
}

.cert-list svg { width: 22px; height: 22px; flex: none; color: #7dd3fc; margin-top: 2px; }

.cert-list strong { display: block; font-size: 15px; }

.cert-list span { color: rgba(255, 255, 255, .72); font-size: 13.5px; }

/* ---------- 新闻 ---------- */
.news-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.news-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  transition: transform .3s ease, box-shadow .3s ease;
  display: flex;
  flex-direction: column;
}

.news-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); }

.news-thumb { overflow: hidden; aspect-ratio: 16 / 9; }

.news-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s ease; }

.news-card:hover .news-thumb img { transform: scale(1.06); }

.news-body { padding: 20px 22px 22px; flex: 1; display: flex; flex-direction: column; }

.news-date {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12.5px;
  color: var(--accent);
  margin-bottom: 10px;
}

.news-date svg { width: 14px; height: 14px; }

.news-body h3 {
  font-size: 16.5px;
  line-height: 1.55;
  color: var(--primary-deep);
  margin-bottom: 10px;
  flex: 1;
}

.news-body p {
  font-size: 13.5px;
  color: var(--muted);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ---------- 服务流程 ---------- */
.process {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
  counter-reset: step;
}

.step {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px 20px 26px;
  text-align: center;
  transition: transform .3s ease, box-shadow .3s ease;
}

.step:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); }

.step::before {
  counter-increment: step;
  content: "0" counter(step);
  display: block;
  font-size: 15px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 2px;
  margin-bottom: 12px;
}

.step .step-icon {
  width: 54px;
  height: 54px;
  margin: 0 auto 16px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--accent-soft);
  color: var(--primary);
}

.step .step-icon svg { width: 26px; height: 26px; }

.step h3 { font-size: 16.5px; color: var(--primary-deep); margin-bottom: 8px; }

.step p { font-size: 13.5px; color: var(--muted); }

/* ---------- CTA ---------- */
.cta-band { background: linear-gradient(115deg, var(--primary-dark), var(--primary) 60%, #1272b8); color: #fff; }

.cta-inner {
  padding: 64px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}

.cta-inner h2 { font-size: clamp(22px, 2.6vw, 30px); letter-spacing: 1px; }

.cta-inner p { color: rgba(255, 255, 255, .8); margin-top: 8px; }

.cta-phone {
  display: flex;
  align-items: center;
  gap: 16px;
}

.cta-phone svg { width: 46px; height: 46px; padding: 11px; border-radius: 50%; background: rgba(255, 255, 255, .14); flex: none; }

.cta-phone .label { font-size: 13px; color: rgba(255, 255, 255, .75); }

.cta-phone .num { font-size: 26px; font-weight: 700; letter-spacing: 1px; font-variant-numeric: tabular-nums; }

/* ---------- 页脚 ---------- */
.site-footer {
  background: var(--primary-deep);
  color: rgba(255, 255, 255, .75);
  font-size: 14.5px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 44px;
  padding: 64px 0 48px;
}

.footer-brand .brand-name { color: #fff; }

.footer-brand .brand-sub { color: rgba(255, 255, 255, .55); }

.footer-brand p { margin-top: 18px; font-size: 14px; line-height: 1.9; }

.footer-col h4 {
  color: #fff;
  font-size: 16px;
  letter-spacing: 2px;
  margin-bottom: 20px;
  position: relative;
  padding-bottom: 12px;
}

.footer-col h4::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 28px;
  height: 2.5px;
  border-radius: 2px;
  background: var(--accent);
}

.footer-col li { margin-bottom: 11px; }

.footer-col a { transition: color .2s ease, padding-left .2s ease; }

.footer-col a:hover { color: #fff; padding-left: 4px; }

.footer-contact li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  margin-bottom: 14px;
}

.footer-contact svg { width: 17px; height: 17px; flex: none; margin-top: 4px; color: var(--accent); }

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, .12);
  padding: 22px 0;
}

.footer-bottom-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  font-size: 13px;
  color: rgba(255, 255, 255, .55);
}

.footer-bottom a { color: rgba(255, 255, 255, .7); }

.footer-bottom a:hover { color: #fff; }

/* ---------- 内页 banner ---------- */
.page-banner {
  position: relative;
  color: #fff;
  overflow: hidden;
  background: linear-gradient(120deg, var(--primary-deep), var(--primary) 70%, #0e5da0);
}

.page-banner .banner-bg {
  position: absolute;
  inset: 0;
  background: url("../img/plant.png") center / cover no-repeat;
  opacity: .35;
}

.banner-inner { position: relative; z-index: 2; padding: 74px 0 58px; }

.banner-inner h1 { font-size: clamp(26px, 3.4vw, 38px); letter-spacing: 3px; margin-bottom: 10px; }

.banner-inner p { color: rgba(255, 255, 255, .75); font-size: 15px; letter-spacing: 1px; }

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13.5px;
  color: rgba(255, 255, 255, .7);
  margin-top: 22px;
}

.breadcrumb a:hover { color: #fff; }

.breadcrumb .sep { opacity: .5; }

/* ---------- 关于页 ---------- */
.prose { max-width: 860px; margin: 0 auto; }

.prose p { color: var(--muted); margin-bottom: 16px; text-indent: 2em; }

.prose p strong { color: var(--text); }

.about-photo-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin: 40px 0 10px;
}

.about-photo-row img {
  width: 100%;
  height: 320px;
  object-fit: cover;
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

/* 时间线 */
.timeline { position: relative; max-width: 760px; margin: 0 auto; padding-left: 34px; }

.timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(var(--accent), var(--primary));
  border-radius: 2px;
}

.timeline-item { position: relative; padding-bottom: 34px; }

.timeline-item:last-child { padding-bottom: 0; }

.timeline-item::before {
  content: "";
  position: absolute;
  left: -32px;
  top: 7px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #fff;
  border: 3.5px solid var(--accent);
  box-shadow: 0 0 0 4px rgba(15, 163, 224, .15);
}

.timeline-year { font-size: 19px; font-weight: 700; color: var(--primary); }

.timeline-item p { color: var(--muted); font-size: 15px; margin-top: 4px; }

/* 价值观 */
.values-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.value-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  transition: transform .3s ease, box-shadow .3s ease;
}

.value-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); }

.value-card .char {
  width: 58px;
  height: 58px;
  margin: 0 auto 16px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 24px;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--accent));
}

.value-card h3 { font-size: 17px; color: var(--primary-deep); margin-bottom: 8px; }

.value-card p { font-size: 13.5px; color: var(--muted); }

/* ---------- 证书卡 ---------- */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.cert-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 22px;
  text-align: center;
  cursor: pointer;
  transition: transform .3s ease, box-shadow .3s ease, border-color .3s ease;
}

.cert-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); border-color: rgba(15, 163, 224, .4); }

.cert-card .cert-icon {
  width: 58px;
  height: 58px;
  margin: 0 auto 16px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  background: var(--accent-soft);
  color: var(--primary);
}

.cert-card .cert-icon svg { width: 28px; height: 28px; }

.cert-card h3 { font-size: 15.5px; color: var(--primary-deep); line-height: 1.5; }

.cert-card span { font-size: 12.5px; color: var(--muted); }

/* 安全要点 */
.safety-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.safety-card {
  display: flex;
  gap: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: transform .3s ease, box-shadow .3s ease;
}

.safety-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-sm); }

.safety-card svg { width: 34px; height: 34px; flex: none; color: var(--accent); margin-top: 3px; }

.safety-card h3 { font-size: 16px; color: var(--primary-deep); margin-bottom: 6px; }

.safety-card p { font-size: 13.5px; color: var(--muted); }

/* ---------- 产品详情表 ---------- */
.spec-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14.5px;
  background: var(--surface);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.spec-table th, .spec-table td { padding: 13px 18px; text-align: left; border-bottom: 1px solid var(--border); }

.spec-table th { background: var(--accent-soft); color: var(--primary-deep); font-weight: 600; white-space: nowrap; }

.spec-table tr:last-child td { border-bottom: none; }

.spec-table td { color: var(--muted); }

.spec-table td:first-child { color: var(--text); font-weight: 500; }

/* 订购流程（产品页复用 process） */

/* ---------- 新闻列表页 ---------- */
.news-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 40px;
  align-items: start;
}

.news-list { display: grid; gap: 24px; }

.news-item {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  transition: transform .3s ease, box-shadow .3s ease;
}

.news-item:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }

.news-item .news-thumb { aspect-ratio: auto; height: 100%; min-height: 160px; }

.news-item .news-body { padding: 22px 26px; }

.news-item h3 { font-size: 17.5px; }

.news-item p { -webkit-line-clamp: 2; }

.side-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 24px;
}

.side-panel h4 {
  background: var(--accent-soft);
  color: var(--primary-deep);
  font-size: 15.5px;
  padding: 14px 20px;
  letter-spacing: 1px;
}

.side-panel ul { padding: 12px 20px 16px; }

.side-panel li {
  padding: 10px 0;
  border-bottom: 1px dashed var(--border);
  font-size: 14px;
  color: var(--muted);
  cursor: pointer;
  transition: color .2s ease;
  display: flex;
  gap: 8px;
  align-items: baseline;
}

.side-panel li:last-child { border-bottom: none; }

.side-panel li:hover { color: var(--primary); }

.side-panel li::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
  flex: none;
  transform: translateY(-2px);
}

.side-panel li time { margin-left: auto; font-size: 12px; color: #9aa8b8; flex: none; }

.side-contact { padding: 22px; text-align: center; }

.side-contact .num { font-size: 23px; font-weight: 700; color: var(--primary); margin: 6px 0 2px; }

.side-contact p { font-size: 13px; color: var(--muted); }

/* ---------- 联系页 ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.contact-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px 24px;
  text-align: center;
  transition: transform .3s ease, box-shadow .3s ease;
}

.contact-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); }

.contact-card .icon-ring { margin-bottom: 14px; }

.contact-card h3 { font-size: 16px; color: var(--primary-deep); margin-bottom: 8px; }

.contact-card p { font-size: 14px; color: var(--muted); }

.contact-card p strong { color: var(--primary); font-size: 16px; }

.contact-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 44px;
  align-items: start;
}

.form-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px;
  box-shadow: var(--shadow-sm);
}

.form-card h3 { font-size: 20px; color: var(--primary-deep); margin-bottom: 6px; }

.form-card .tip { font-size: 13.5px; color: var(--muted); margin-bottom: 26px; }

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }

.field { margin-bottom: 18px; }

.field label { display: block; font-size: 14px; font-weight: 500; color: var(--text); margin-bottom: 7px; }

.field label em { color: var(--cta); font-style: normal; margin-left: 2px; }

.field input, .field textarea, .field select {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 14.5px;
  color: var(--text);
  background: #fbfdff;
  transition: border-color .2s ease, box-shadow .2s ease;
}

.field textarea { resize: vertical; min-height: 120px; }

.field input:focus, .field textarea:focus, .field select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(15, 163, 224, .15);
}

.map-box {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  margin-bottom: 26px;
}

.map-box img { width: 100%; height: 320px; object-fit: cover; }

.contact-notes h3 { font-size: 18px; color: var(--primary-deep); margin-bottom: 16px; }

.contact-notes li {
  display: flex;
  gap: 10px;
  font-size: 14.5px;
  color: var(--muted);
  margin-bottom: 12px;
}

.contact-notes svg { width: 19px; height: 19px; flex: none; margin-top: 3px; color: var(--accent); }

/* ---------- 返回顶部 ---------- */
.back-top {
  position: fixed;
  right: 26px;
  bottom: 30px;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: none;
  background: var(--primary);
  color: #fff;
  display: grid;
  place-items: center;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: all .3s ease;
  z-index: 90;
}

.back-top.show { opacity: 1; visibility: visible; transform: translateY(0); }

.back-top:hover { background: var(--primary-dark); }

.back-top svg { width: 20px; height: 20px; }

/* ---------- 进场动画 ---------- */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity .7s ease, transform .7s ease; }

.reveal.visible { opacity: 1; transform: none; }

.reveal[data-delay="1"] { transition-delay: .1s; }
.reveal[data-delay="2"] { transition-delay: .2s; }
.reveal[data-delay="3"] { transition-delay: .3s; }
.reveal[data-delay="4"] { transition-delay: .4s; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .hero-bg { animation: none; }
  .reveal { opacity: 1; transform: none; transition: none; }
  * { transition-duration: .01ms !important; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
  .product-grid, .industry-grid, .values-grid, .cert-grid { grid-template-columns: repeat(3, 1fr); }
  .process { grid-template-columns: repeat(3, 1fr); }
  .contact-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .news-layout { grid-template-columns: 1fr; }
  .side-col { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
}

@media (max-width: 900px) {
  .about-split { grid-template-columns: 1fr; gap: 56px; }
  .about-media .media-main img { height: 360px; }
  .band-inner { grid-template-columns: 1fr; gap: 40px; }
  .contact-split { grid-template-columns: 1fr; }
  .safety-grid { grid-template-columns: 1fr 1fr; }
  .news-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .topbar-group.right { display: none; }
  .nav-toggle { display: grid; }
  .header-cta { display: none; }
  .nav {
    position: fixed;
    top: calc(var(--nav-h) + 38px);
    left: 0;
    right: 0;
    background: #fff;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-md);
    padding: 10px 4%;
    transform: translateY(-12px);
    opacity: 0;
    visibility: hidden;
    transition: all .28s ease;
    z-index: 99;
  }
  .nav-open .nav {
    transform: none;
    opacity: 1;
    visibility: visible;
  }
  .nav-list { flex-direction: column; align-items: stretch; gap: 2px; }
  .nav-link { padding: 13px 14px; border-radius: 8px; }
  .nav-link::after { display: none; }
  .nav-link.active { background: var(--accent-soft); }
  .hero { min-height: 560px; }
  .hero-inner { padding: 90px 0 70px; }
  .stats-card { grid-template-columns: 1fr 1fr; }
  .stat:nth-child(3) { border-left: none; }
  .stat { border-top: 1px solid var(--border); }
  .stat:nth-child(-n+2) { border-top: none; }
  .section { padding: 64px 0; }
  .product-grid, .industry-grid, .values-grid, .cert-grid { grid-template-columns: 1fr 1fr; }
  .process { grid-template-columns: 1fr 1fr; }
  .check-list { grid-template-columns: 1fr; }
  .media-float { right: 12px; bottom: -26px; padding: 16px 20px; min-width: 150px; }
  .about-photo-row { grid-template-columns: 1fr; }
  .news-item { grid-template-columns: 1fr; }
  .news-item .news-thumb { aspect-ratio: 16/9; min-height: 0; }
  .form-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 34px; padding: 48px 0 36px; }
  .cta-inner { padding: 48px 0; }
}

@media (max-width: 520px) {
  .product-grid, .industry-grid, .values-grid, .cert-grid, .process, .safety-grid, .news-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .hero-badges { gap: 14px; }
  .hero-actions .btn { width: 100%; }
  .side-col { grid-template-columns: 1fr; }
}