:root {
  --primary: #0a5c8c;
  --primary-dark: #06466b;
  --accent: #1f9d7a;
  --accent-dark: #147a5d;
  --amber: #d99a1f;
  --ink: #1a2b3c;
  --muted: #5b6b7c;
  --bg: #f4f7fa;
  --card: #ffffff;
  --line: #e3e9f0;
  --radius: 14px;
  --shadow: 0 8px 30px rgba(10, 92, 140, 0.08);
  --shadow-hover: 0 14px 40px rgba(10, 92, 140, 0.16);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
ul { list-style: none; }

.container { width: min(1180px, 92%); margin: 0 auto; }

/* ===== 顶部信息条 ===== */
.topbar {
  background: var(--primary-dark);
  color: #cfe3f2;
  font-size: 13px;
  padding: 8px 0;
}
.topbar .container { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 8px; }
.topbar a { color: #fff; }
.topbar .hot { color: #ffd166; font-weight: 700; }
.topbar-hidden { opacity: 0.85; }

/* ===== 导航 ===== */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav .container { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.brand { display: flex; align-items: center; gap: 12px; }
.brand .logo {
  width: 44px; height: 44px; border-radius: 12px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: grid; place-items: center; color: #fff; font-weight: 800; font-size: 20px;
}
.brand .name { font-size: 19px; font-weight: 800; letter-spacing: .5px; }
.brand .name span { color: var(--primary); }
.brand .sub { font-size: 11px; color: var(--muted); letter-spacing: 1px; }

.nav-links { display: flex; align-items: center; gap: 6px; }
.nav-links a {
  padding: 9px 16px; border-radius: 9px; font-size: 15px; font-weight: 500;
  color: var(--ink); transition: .2s;
}
.nav-links a:hover { background: #eef4f9; color: var(--primary); }
.nav-links a.active { background: var(--primary); color: #fff; }
.nav .btn-inquire {
  margin-left: 10px; background: var(--accent); color: #fff !important;
  padding: 10px 20px; border-radius: 9px; font-weight: 700;
}
.nav .btn-inquire:hover { background: var(--accent-dark); }

/* ===== 语言切换器 ===== */
.lang-switch { position: relative; margin-left: 12px; }
.lang-btn {
  display: flex; align-items: center; gap: 6px;
  background: #eef4f9; border: 1px solid var(--line); color: var(--ink);
  padding: 8px 12px; border-radius: 9px; font-size: 14px; font-weight: 600; cursor: pointer;
}
.lang-btn .globe { font-size: 16px; }
.lang-btn .arrow { font-size: 11px; transition: .2s; }
.lang-switch.open .lang-btn .arrow { transform: rotate(180deg); }
.lang-list {
  position: absolute; top: calc(100% + 8px); right: 0; min-width: 130px;
  background: #fff; border: 1px solid var(--line); border-radius: 10px;
  box-shadow: 0 12px 30px rgba(10, 92, 140, .15); padding: 6px; opacity: 0;
  transform: translateY(-6px); pointer-events: none; transition: .2s; z-index: 200;
}
.lang-switch.open .lang-list { opacity: 1; transform: translateY(0); pointer-events: auto; }
.lang-list a {
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
  padding: 9px 12px; border-radius: 7px; font-size: 14px; color: var(--ink);
}
.lang-list a:hover { background: #eef4f9; color: var(--primary); }
.lang-list a.active { background: var(--primary); color: #fff; }
.lang-list a .check { font-size: 12px; font-weight: 800; }

.menu-toggle { display: none; background: none; border: none; font-size: 26px; color: var(--ink); cursor: pointer; }

/* ===== 按钮 ===== */
.btn {
  display: inline-block; padding: 13px 30px; border-radius: 10px;
  font-weight: 700; font-size: 15px; transition: .25s; border: none; cursor: pointer;
}
.btn-primary { background: var(--accent); color: #fff; box-shadow: 0 6px 18px rgba(31, 157, 122, .35); }
.btn-primary:hover { background: var(--accent-dark); transform: translateY(-2px); }
.btn-outline { background: rgba(255,255,255,.12); color: #fff; border: 1.5px solid rgba(255,255,255,.6); }
.btn-outline:hover { background: #fff; color: var(--primary); }
.btn-ghost { background: #eef4f9; color: var(--primary); }
.btn-ghost:hover { background: #dcebf6; }
.btn-lg { padding: 16px 38px; font-size: 16px; }

/* ===== Hero ===== */
.hero {
  position: relative; overflow: hidden;
  background: linear-gradient(135deg, #06466b 0%, #0a5c8c 55%, #14725c 100%);
  color: #fff;
  padding: 92px 0 100px;
}
.hero::after {
  content: ""; position: absolute; right: -120px; top: -120px; width: 480px; height: 480px;
  background: radial-gradient(circle, rgba(255,255,255,.10), transparent 70%); border-radius: 50%;
}
.hero .container { position: relative; z-index: 1; display: grid; grid-template-columns: 1.05fr .95fr; gap: 48px; align-items: center; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(255,255,255,.14); border: 1px solid rgba(255,255,255,.25);
  padding: 7px 15px; border-radius: 30px; font-size: 13px; margin-bottom: 22px;
}
.hero h1 { font-size: 44px; line-height: 1.22; font-weight: 900; letter-spacing: .5px; margin-bottom: 20px; }
.hero h1 .g { color: #6fe0b6; }
.hero p.lead { font-size: 17px; color: #d7e8f5; max-width: 520px; margin-bottom: 30px; }
.hero-stats { display: flex; gap: 34px; margin-bottom: 34px; flex-wrap: wrap; }
.hero-stats .s b { display: block; font-size: 30px; font-weight: 900; color: #fff; }
.hero-stats .s span { font-size: 13px; color: #c7dded; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }

.hero-figure { position: relative; }
.hero-figure img {
  width: 100%; border-radius: 18px; border: 1px solid rgba(255,255,255,.2);
  box-shadow: 0 24px 60px rgba(0,0,0,.35);
}
.hero-card {
  position: absolute; left: -22px; bottom: 22px;
  background: #fff; color: var(--ink); border-radius: 13px; padding: 15px 18px;
  box-shadow: 0 16px 40px rgba(0,0,0,.25); display: flex; align-items: center; gap: 12px;
}
.hero-card .ic { width: 42px; height: 42px; border-radius: 10px; background: #e3f5ee; display: grid; place-items: center; font-size: 22px; }
.hero-card b { display: block; font-size: 16px; color: var(--primary); }
.hero-card small { color: var(--muted); font-size: 12px; }

/* ===== 通用 section ===== */
.section { padding: 74px 0; }
.section-narrow { padding: 54px 0; }
.sec-head { text-align: center; max-width: 720px; margin: 0 auto 46px; }
.sec-head .tag {
  display: inline-block; font-size: 13px; font-weight: 700; letter-spacing: 2px;
  color: var(--accent); background: #e3f5ee; padding: 5px 14px; border-radius: 30px; margin-bottom: 14px;
}
.sec-head h2 { font-size: 32px; font-weight: 900; margin-bottom: 12px; }
.sec-head p { color: var(--muted); font-size: 16px; }

/* ===== 高纯度卖点 ===== */
.specs-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.spec-card {
  background: var(--card); border-radius: var(--radius); padding: 26px 22px;
  border: 1px solid var(--line); box-shadow: var(--shadow); transition: .25s; text-align: center;
}
.spec-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.spec-card .num {
  font-size: 34px; font-weight: 900; color: var(--primary); letter-spacing: .5px;
}
.spec-card .num small { font-size: 17px; color: var(--accent); font-weight: 800; }
.spec-card h3 { font-size: 16px; margin: 8px 0 6px; }
.spec-card p { font-size: 13px; color: var(--muted); }

/* ===== 产品卡片 ===== */
.product-showcase {
  display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center;
  background: var(--card); border-radius: 20px; border: 1px solid var(--line);
  box-shadow: var(--shadow); padding: 40px; overflow: hidden;
}
.product-showcase .img-wrap img { border-radius: 14px; }
.badge-purity {
  display: inline-block; background: var(--amber); color: #fff; font-weight: 800;
  padding: 5px 13px; border-radius: 30px; font-size: 13px; margin-bottom: 14px;
}
.product-showcase h3 { font-size: 27px; font-weight: 900; margin-bottom: 12px; }
.product-showcase h3 small { display: block; font-size: 14px; color: var(--muted); font-weight: 500; margin-top: 4px; }
.product-showcase p { color: var(--muted); margin-bottom: 18px; }
.check-list li { display: flex; gap: 9px; align-items: flex-start; margin-bottom: 10px; font-size: 15px; }
.check-list li::before { content: "✔"; color: var(--accent); font-weight: 900; }

/* ===== 应用场景 ===== */
.applications { background: linear-gradient(180deg, #fff, var(--bg)); }
.app-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.app-card {
  background: var(--card); border-radius: var(--radius); overflow: hidden;
  border: 1px solid var(--line); box-shadow: var(--shadow); transition: .25s;
}
.app-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.app-card img { height: 180px; width: 100%; object-fit: cover; }
.app-card .body { padding: 20px 20px 22px; }
.app-card .body .tag-ic { font-size: 22px; }
.app-card h3 { font-size: 17px; margin: 8px 0 8px; }
.app-card p { font-size: 14px; color: var(--muted); }

/* ===== 包装发货 ===== */
.package-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.package-card {
  background: var(--card); border-radius: var(--radius); padding: 28px;
  border: 1px solid var(--line); box-shadow: var(--shadow); display: flex; gap: 22px; align-items: flex-start;
}
.package-card img { width: 150px; height: 150px; border-radius: 12px; object-fit: cover; flex-shrink: 0; }
.package-card h3 { font-size: 19px; margin-bottom: 8px; color: var(--primary); }
.package-card p { font-size: 14px; color: var(--muted); }
.package-card ul { margin-top: 12px; }
.package-card ul li { font-size: 14px; margin-bottom: 6px; }
.package-card ul li b { color: var(--ink); }

/* ===== 价格说明 ===== */
.price-note {
  background: linear-gradient(135deg, #fff7e8, #fff);
  border: 1px solid #f3e0b8; border-radius: 18px; padding: 34px 38px;
  box-shadow: var(--shadow);
}
.price-note h3 { font-size: 22px; margin-bottom: 14px; color: #a7720b; }
.price-note .points { display: grid; grid-template-columns: 1fr 1fr; gap: 14px 30px; margin: 18px 0; }
.price-note .points li { display: flex; gap: 10px; font-size: 15px; align-items: flex-start; }
.price-note .points li .dot { color: var(--amber); font-weight: 900; }
.price-alert {
  display: flex; gap: 12px; align-items: center; background: #fff; border-radius: 12px;
  padding: 16px 20px; border: 1px solid #f3e0b8; color: #8a5c07; font-weight: 600; font-size: 15px;
}

/* ===== CTA ===== */
.cta {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  color: #fff; text-align: center; padding: 66px 0; border-radius: 20px;
}
.cta h2 { font-size: 30px; font-weight: 900; margin-bottom: 12px; }
.cta p { color: #d7e8f5; max-width: 560px; margin: 0 auto 26px; }
.cta .actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ===== 页脚 ===== */
.footer { background: #0b1f2e; color: #b9cbd9; padding: 54px 0 28px; }
.footer .grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 34px; }
.footer h4 { color: #fff; font-size: 16px; margin-bottom: 16px; }
.footer p, .footer li { font-size: 14px; margin-bottom: 9px; }
.footer a:hover { color: #fff; }
.footer .brand-name { color: #fff; font-weight: 800; font-size: 18px; margin-bottom: 10px; }
.footer-links li a { color: #b9cbd9; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.12); margin-top: 40px; padding-top: 20px;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; font-size: 13px; color: #7f95a8;
}

/* ===== 面包屑 ===== */
.page-hero {
  background: linear-gradient(135deg, #06466b, #0a5c8c); color: #fff; padding: 48px 0;
}
.breadcrumb { font-size: 14px; color: #c7dded; margin-bottom: 8px; }
.breadcrumb a:hover { color: #fff; }
.page-hero h1 { font-size: 34px; font-weight: 900; }
.page-hero p { color: #d7e8f5; margin-top: 6px; }

/* ===== 详情页布局 ===== */
.detail-layout { display: grid; grid-template-columns: 1fr 1.1fr; gap: 44px; align-items: start; }
.gallery-main { border-radius: 16px; overflow: hidden; border: 1px solid var(--line); box-shadow: var(--shadow); }
.gallery-thumbs { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-top: 12px; }
.gallery-thumbs img { border-radius: 10px; border: 2px solid transparent; cursor: pointer; height: 82px; width: 100%; object-fit: cover; transition: .2s; }
.gallery-thumbs img.active, .gallery-thumbs img:hover { border-color: var(--primary); }

.detail-info h1 { font-size: 30px; font-weight: 900; margin-bottom: 6px; }
.detail-info .en { color: var(--muted); font-size: 15px; margin-bottom: 16px; }
.detail-info .purity-big {
  display: inline-block; background: linear-gradient(135deg, var(--amber), #f0b33c); color: #fff;
  font-weight: 900; padding: 9px 18px; border-radius: 10px; font-size: 19px; margin-bottom: 20px;
}
.detail-info .desc { color: var(--muted); margin-bottom: 20px; }
.detail-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 24px; }

.info-card { background: var(--card); border-radius: var(--radius); border: 1px solid var(--line); padding: 22px 24px; box-shadow: var(--shadow); }

/* ===== 参数表 ===== */
.spec-table { width: 100%; border-collapse: collapse; }
.spec-table th, .spec-table td { padding: 13px 16px; text-align: left; font-size: 15px; border-bottom: 1px solid var(--line); }
.spec-table th { background: var(--primary); color: #fff; font-weight: 700; }
.spec-table th:first-child { border-radius: 10px 0 0 0; }
.spec-table th:last-child { border-radius: 0 10px 0 0; }
.spec-table tr:nth-child(even) td { background: #f7fafc; }
.spec-table td:first-child { font-weight: 600; color: var(--primary-dark); width: 40%; }
.spec-table tr:last-child td:last-child { border-radius: 0 0 10px 0; }
.spec-table tr:last-child td:first-child { border-radius: 0 0 0 10px; }
.highlight-cell { color: var(--accent-dark); font-weight: 800; }

/* ===== 特性列表 ===== */
.feature-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.feature-item { display: flex; gap: 14px; align-items: flex-start; }
.feature-item .ic {
  width: 46px; height: 46px; border-radius: 12px; background: #e3f5ee; flex-shrink: 0;
  display: grid; place-items: center; font-size: 22px;
}
.feature-item h3 { font-size: 16px; margin-bottom: 4px; }
.feature-item p { font-size: 14px; color: var(--muted); }

/* ===== 响应式 ===== */
@media (max-width: 900px) {
  .hero .container { grid-template-columns: 1fr; }
  .hero h1 { font-size: 32px; }
  .specs-grid { grid-template-columns: repeat(2, 1fr); }
  .app-grid { grid-template-columns: repeat(2, 1fr); }
  .product-showcase, .detail-layout { grid-template-columns: 1fr; }
  .package-grid, .footer .grid { grid-template-columns: 1fr; }
  .price-note .points { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr; }
  .nav-links {
    position: absolute; top: 72px; left: 0; right: 0; background: #fff;
    flex-direction: column; align-items: stretch; padding: 14px; gap: 8px;
    border-bottom: 1px solid var(--line); display: none;
  }
  .nav-links.open { display: flex; }
  .nav .btn-inquire { margin-left: 0; text-align: center; }
  .menu-toggle { display: block; }
}
@media (max-width: 560px) {
  .specs-grid, .app-grid { grid-template-columns: 1fr; }
  .hero-stats { gap: 20px; }
  .package-card { flex-direction: column; }
  .package-card img { width: 100%; height: auto; }
  .section { padding: 54px 0; }
}

/* ===== FAQ 常见问题 ===== */
.faq-list { max-width: 820px; margin: 0 auto; display: flex; flex-direction: column; gap: 14px; }
.faq-item {
  background: var(--card); border: 1px solid var(--line); border-radius: 12px;
  padding: 20px 24px; box-shadow: var(--shadow);
}
.faq-item h3 {
  font-size: 17px; font-weight: 700; color: var(--primary-dark); margin-bottom: 8px;
  display: flex; align-items: flex-start; gap: 10px;
}
.faq-item h3::before {
  content: "Q"; color: #fff; background: var(--accent); font-size: 13px; font-weight: 800;
  line-height: 1.5; padding: 1px 9px; border-radius: 6px; flex-shrink: 0;
}
.faq-item p { font-size: 15px; color: var(--muted); }