/* ==========================================================================
   阿尔特新材料 · 前台样式（品牌风格：深蓝底 + 科技青点缀，源头工厂质感）
   ========================================================================== */
:root {
  --bg: #f2f6fa;
  --surface: #ffffff;
  --ink: #14263a;
  --ink-soft: #2e4257;
  --muted: #64788c;
  --accent: #0f93cf;
  --accent-dark: #0c76a8;
  --accent-soft: #e0f1fa;
  --line: #dbe5ee;
  --dark: #0e2a47;
  --dark-2: #143454;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(14, 42, 71, .08);
  --font-serif: "Microsoft YaHei", "PingFang SC", "Segoe UI", sans-serif;
  --font-sans: "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.75;
  font-size: 16px;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
.wrap { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.ic { width: 15px; height: 15px; fill: currentColor; vertical-align: -2px; }

/* ---------- 顶栏 & 头部 ---------- */
.topbar { background: var(--dark); color: #b9cbdd; font-size: 13px; }
.topbar-in { display: flex; justify-content: space-between; align-items: center; height: 36px; }
.topbar-contact b { color: #74cdec; font-weight: 600; margin-left: 4px; }
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, .94);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.header-in { display: flex; align-items: center; gap: 18px; height: 76px; }
.brand { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.brand-mark {
  width: 44px; height: 44px; background: var(--accent); color: #fff;
  display: grid; place-items: center; font-family: var(--font-serif);
  font-size: 19px; font-weight: 700; letter-spacing: 1px; border-radius: 10px;
}
.brand-text b { display: block; font-family: var(--font-serif); font-size: 21px; letter-spacing: 2px; }
.brand-text i { display: block; font-style: normal; font-size: 10.5px; color: var(--muted); letter-spacing: 1px; transform: scale(.92); transform-origin: left; }
.main-nav { display: flex; align-items: center; gap: 2px; margin-left: auto; }
.main-nav > a, .nav-drop > a {
  padding: 8px 11px; font-size: 15px; color: var(--ink-soft);
  border-radius: 8px; transition: .2s; position: relative; display: block;
  white-space: nowrap;
}
.main-nav > a:hover, .main-nav > a.on, .nav-drop.on > a, .nav-drop > a:hover { color: var(--accent); background: var(--accent-soft); }
.nav-drop { position: relative; }
.nav-drop em { font-size: 11px; font-style: normal; color: var(--muted); }
.drop-panel {
  position: absolute; top: calc(100% + 6px); left: 0; min-width: 176px;
  background: var(--surface); border: 1px solid var(--line); border-radius: 12px;
  box-shadow: var(--shadow); padding: 8px; display: none; z-index: 50;
}
.nav-drop:hover .drop-panel { display: block; }
.drop-panel a { display: block; padding: 8px 12px; border-radius: 8px; font-size: 14.5px; color: var(--ink-soft); }
.drop-panel a:hover { background: var(--accent-soft); color: var(--accent); }
.header-phone { display: flex; align-items: center; gap: 10px; padding: 6px 0 6px 14px; border-left: 1px solid var(--line); white-space: nowrap; flex-shrink: 0; }
.header-phone .ic { width: 20px; height: 20px; color: var(--accent); flex-shrink: 0; }
.header-phone i { display: block; font-style: normal; font-size: 11px; color: var(--muted); }
.header-phone b { font-size: 15.5px; color: var(--ink); white-space: nowrap; }
.nav-toggle { display: none; background: none; border: 1px solid var(--line); border-radius: 8px; padding: 9px 10px; cursor: pointer; }
.nav-toggle span { display: block; width: 18px; height: 2px; background: var(--ink); margin: 4px 0; border-radius: 2px; }

/* ---------- 通用组件 ---------- */
.kicker {
  display: inline-block; font-size: 11px; letter-spacing: 3px; color: var(--accent);
  font-weight: 600; margin-bottom: 10px;
}
.btn {
  display: inline-block; padding: 12px 26px; border-radius: 999px; font-size: 15px;
  transition: .2s; cursor: pointer; border: 1.5px solid transparent; text-align: center;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-dark); transform: translateY(-1px); }
.btn-ghost { border-color: var(--ink); color: var(--ink); }
.btn-ghost:hover { background: var(--ink); color: #fff; }
.btn-ghost.light { border-color: rgba(255,255,255,.55); color: #fff; }
.btn-ghost.light:hover { background: #fff; color: var(--ink); }
.btn-light { background: #fff; color: var(--accent-dark); font-weight: 600; }
.btn-outline-light { border-color: rgba(255,255,255,.6); color: #fff; }
.btn-outline-light:hover { background: rgba(255,255,255,.12); }
.section { padding: 76px 0; }
.section-alt { background: var(--surface); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section-dark { background: var(--dark); color: #dbe7f2; }
.sec-head { max-width: 640px; margin-bottom: 40px; }
.sec-head.split { max-width: none; display: flex; align-items: flex-end; justify-content: space-between; gap: 24px; }
.sec-head h2 { font-family: var(--font-serif); font-size: 32px; letter-spacing: 1px; line-height: 1.3; }
.sec-head p { color: var(--muted); margin-top: 8px; font-size: 15px; }
.sec-head.light h2 { color: #fff; }
.sec-head.light p { color: #9fb6ca; }
.sec-more { margin-top: 36px; text-align: center; }

/* ---------- 首屏 ---------- */
.hero { overflow: hidden; }
.hero-in { display: grid; grid-template-columns: 1.05fr .95fr; gap: 48px; align-items: center; padding-top: 64px; padding-bottom: 80px; }
.hero-copy h1 {
  font-family: var(--font-serif); font-size: 44px; line-height: 1.28;
  letter-spacing: 2px; margin: 6px 0 18px; white-space: pre-line;
}
.hero-sub { color: var(--muted); font-size: 16.5px; max-width: 480px; }
.hero-actions { display: flex; gap: 14px; margin: 28px 0 36px; flex-wrap: wrap; }
.hero-stats { display: flex; gap: 36px; border-top: 1px solid var(--line); padding-top: 22px; flex-wrap: wrap; }
.hero-stats b { display: block; font-family: var(--font-serif); font-size: 26px; color: var(--accent); }
.hero-stats span { font-size: 12.5px; color: var(--muted); letter-spacing: 1px; }
.hero-visual { position: relative; min-height: 420px; }
.hero-img {
  position: relative; border-radius: 18px; overflow: hidden;
  box-shadow: var(--shadow); background: #fff;
}
.hero-img img { width: 100%; height: 100%; object-fit: cover; }
.hero-img.main { width: 78%; height: 400px; margin-left: auto; }
.hero-img.main::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, transparent 60%, rgba(14,42,71,.18)); }
.hero-img.sub { position: absolute; left: 0; bottom: -12px; width: 46%; height: 180px; border: 6px solid var(--bg); }
.hero-deco.ring {
  position: absolute; top: -26px; left: 6%; width: 96px; height: 96px;
  border: 2px dashed var(--accent); border-radius: 50%; opacity: .55;
}
.hero-deco.dot { position: absolute; bottom: 34px; right: 4px; width: 18px; height: 18px; background: var(--accent); border-radius: 50%; opacity: .8; }

/* ---------- 材料卡片 ---------- */
.mat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.mat-grid.two { grid-template-columns: repeat(2, 1fr); }
.mat-card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; transition: .25s; display: flex; flex-direction: column;
}
.mat-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: #c4d8ea; }
.mat-thumb { height: 150px; background: linear-gradient(135deg, #e8f1f8, #d9e7f3); overflow: hidden; }
.mat-thumb img { width: 100%; height: 100%; object-fit: cover; transition: .4s; }
.mat-card:hover .mat-thumb img { transform: scale(1.05); }
.mat-info { padding: 18px 18px 20px; display: flex; flex-direction: column; gap: 6px; flex: 1; }
.mat-info h3 { font-family: var(--font-serif); font-size: 18.5px; letter-spacing: 1px; }
.mat-info h3 small { font-size: 12px; color: var(--muted); font-family: var(--font-sans); font-weight: 400; margin-left: 6px; }
.mat-formula { font-size: 11.5px; color: var(--accent); letter-spacing: .5px; }
.mat-info p { font-size: 13.5px; color: var(--muted); line-height: 1.65; }
.more { margin-top: auto; padding-top: 10px; font-size: 13px; color: var(--accent); font-weight: 600; }

/* ---------- 产品卡片 ---------- */
.prod-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.prod-grid.four { grid-template-columns: repeat(4, 1fr); }
.prod-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; transition: .25s; display: flex; flex-direction: column;
}
.prod-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); }
.prod-thumb { position: relative; aspect-ratio: 1 / .86; background: #e9f0f7; overflow: hidden; }
.prod-thumb img { width: 100%; height: 100%; object-fit: cover; transition: .45s; }
.prod-card:hover .prod-thumb img { transform: scale(1.06); }
.prod-tag {
  position: absolute; top: 10px; left: 10px; background: rgba(14, 42, 71, .85); color: #e3eef8;
  font-size: 11.5px; padding: 3px 10px; border-radius: 999px; letter-spacing: 1px;
}
.prod-info { padding: 15px 16px 18px; }
.prod-info h3 {
  font-size: 16.5px; font-weight: 600; letter-spacing: .5px;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.prod-info p { font-size: 13px; color: var(--muted); margin-top: 6px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* ---------- 关于我们 ---------- */
.about-split { overflow: hidden; }
.about-in { display: grid; grid-template-columns: .92fr 1.08fr; gap: 52px; align-items: center; }
.about-visual { position: relative; }
.about-visual img { border-radius: 18px; box-shadow: var(--shadow); height: 380px; width: 100%; object-fit: cover; }
.about-visual figcaption {
  position: absolute; left: 18px; bottom: 18px; background: rgba(14,42,71,.85); color: #e3eef8;
  font-size: 12.5px; padding: 6px 14px; border-radius: 999px; letter-spacing: 1px;
}
.about-copy h2 { font-family: var(--font-serif); font-size: 30px; margin-bottom: 16px; letter-spacing: 1px; }
.about-copy p { color: var(--ink-soft); margin-bottom: 12px; font-size: 15px; }
.about-points { margin: 18px 0 26px; }
.about-points li { display: flex; gap: 14px; align-items: baseline; padding: 9px 0; border-bottom: 1px dashed var(--line); font-size: 14.5px; }
.about-points b { font-family: var(--font-serif); color: var(--accent); font-size: 17px; }

/* ---------- 设备 & 证书 ---------- */
.eq-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.eq-card { background: var(--dark-2); border-radius: var(--radius); overflow: hidden; border: 1px solid #1d3c5f; }
.eq-card img { width: 100%; aspect-ratio: 4/3; object-fit: cover; transition: .4s; }
.eq-card:hover img { transform: scale(1.05); }
.eq-card figcaption { padding: 12px 14px; font-size: 14px; color: #dbe7f2; letter-spacing: 1px; }
.cert-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.cert-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; transition: .25s; }
.cert-card:hover { box-shadow: var(--shadow); transform: translateY(-4px); }
.cert-card img { width: 100%; aspect-ratio: 4/3; object-fit: contain; background: #f5f9fd; padding: 12px; }
.cert-card figcaption { padding: 12px 14px; font-size: 13.5px; text-align: center; color: var(--ink-soft); }

/* ---------- 新闻 ---------- */
.news-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.news-card {
  display: flex; gap: 18px; background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 20px 22px; transition: .25s;
}
.news-card:hover { box-shadow: var(--shadow); border-color: #c4d8ea; }
.news-date { text-align: center; flex-shrink: 0; width: 62px; border-right: 1px dashed var(--line); padding-right: 14px; }
.news-date b { display: block; font-family: var(--font-serif); font-size: 27px; color: var(--accent); line-height: 1.1; }
.news-date span { font-size: 12px; color: var(--muted); }
.news-body h3 { font-size: 16.5px; font-weight: 600; line-height: 1.5; }
.news-body p { font-size: 13.5px; color: var(--muted); margin-top: 8px; }

/* ---------- CTA ---------- */
.cta-band { background: linear-gradient(120deg, var(--accent-dark), var(--accent)); color: #fff; }
.cta-in { display: flex; align-items: center; justify-content: space-between; gap: 28px; padding-top: 54px; padding-bottom: 54px; flex-wrap: wrap; }
.cta-in h2 { font-family: var(--font-serif); font-size: 30px; letter-spacing: 1px; line-height: 1.4; }
.cta-in p { opacity: .9; margin-top: 10px; font-size: 15px; }
.cta-actions { display: flex; gap: 14px; flex-wrap: wrap; }

/* ---------- 页头（内页） ---------- */
.page-head {
  background:
    radial-gradient(circle at 88% -30%, rgba(15, 147, 207, .14), transparent 46%),
    linear-gradient(180deg, #f5f9fd, var(--bg));
  border-bottom: 1px solid var(--line);
  padding: 46px 0 34px;
}
.page-head h1 { font-family: var(--font-serif); font-size: 34px; letter-spacing: 2px; margin-top: 2px; }
.crumbs { margin-top: 10px; font-size: 13px; color: var(--muted); }
.crumbs a:hover { color: var(--accent); }
.crumbs b { color: var(--ink-soft); font-weight: 600; }

/* ---------- 筛选 & 分页 ---------- */
.filter-bar { display: flex; justify-content: space-between; align-items: center; gap: 18px; margin-bottom: 14px; flex-wrap: wrap; }
.cat-chips { display: flex; gap: 8px; flex-wrap: wrap; }
.chip {
  padding: 7px 16px; border: 1px solid var(--line); border-radius: 999px; font-size: 13.5px;
  color: var(--ink-soft); background: var(--surface); transition: .2s;
}
.chip:hover, .chip.on { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); }
.search-form { display: flex; }
.search-form input {
  border: 1px solid var(--line); border-right: 0; background: var(--surface);
  padding: 9px 14px; border-radius: 999px 0 0 999px; outline: none; font-size: 14px; width: 210px;
}
.search-form button {
  border: 1px solid var(--accent); background: var(--accent); color: #fff;
  padding: 0 20px; border-radius: 0 999px 999px 0; cursor: pointer; font-size: 14px;
}
.result-note { font-size: 13.5px; color: var(--muted); margin: 14px 0 24px; }
.result-note b { color: var(--accent); }
.pager { display: flex; justify-content: center; gap: 8px; margin-top: 40px; flex-wrap: wrap; }
.pager a, .pager b {
  min-width: 38px; height: 38px; display: inline-grid; place-items: center;
  border: 1px solid var(--line); border-radius: 10px; font-size: 14px; background: var(--surface); padding: 0 10px;
}
.pager b.on { background: var(--accent); border-color: var(--accent); color: #fff; }
.pager a:hover { border-color: var(--accent); color: var(--accent); }
.empty-block { text-align: center; color: var(--muted); padding: 60px 0; }
.empty-block.big h1 { font-family: var(--font-serif); font-size: 72px; color: var(--accent); }
.empty-block.big .btn { margin-top: 18px; }

/* ---------- 产品详情 ---------- */
.pd-layout { display: grid; grid-template-columns: 1.02fr .98fr; gap: 48px; align-items: start; }
.pd-main { border-radius: var(--radius); overflow: hidden; border: 1px solid var(--line); background: #fff; }
.pd-main img { width: 100%; aspect-ratio: 1/.9; object-fit: cover; }
.pd-main.material img { aspect-ratio: 4/3; object-fit: contain; padding: 24px; }
.pd-thumbs { display: grid; grid-template-columns: repeat(6, 1fr); gap: 10px; margin-top: 14px; }
.pd-thumb { border: 2px solid var(--line); border-radius: 10px; overflow: hidden; padding: 0; cursor: pointer; background: #fff; }
.pd-thumb.on { border-color: var(--accent); }
.pd-thumb img { width: 100%; aspect-ratio: 1; object-fit: cover; }
.pd-info h2 { font-family: var(--font-serif); font-size: 30px; margin: 12px 0; letter-spacing: 1px; }
.pd-summary { color: var(--muted); font-size: 15px; }
.pd-meta { margin: 22px 0; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.pd-meta li { display: flex; border-bottom: 1px dashed var(--line); font-size: 14.5px; }
.pd-meta li:last-child { border-bottom: 0; }
.pd-meta span { width: 96px; background: #eaf1f8; color: var(--muted); padding: 10px 16px; flex-shrink: 0; }
.pd-meta b { padding: 10px 16px; font-weight: 500; }
.pd-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.block-title { font-family: var(--font-serif); font-size: 21px; letter-spacing: 1px; margin-bottom: 18px; padding-left: 14px; border-left: 4px solid var(--accent); }
.pd-cols { display: grid; grid-template-columns: 1.5fr 1fr; gap: 48px; align-items: start; }
.pd-desc p { margin-bottom: 14px; color: var(--ink-soft); font-size: 15px; text-align: justify; }
.pd-params table, .param-table { width: 100%; border-collapse: collapse; font-size: 14px; background: #fff; border-radius: 12px; overflow: hidden; }
.pd-params td, .param-table td, .param-table th { padding: 10px 14px; border-bottom: 1px solid var(--line); }
.pd-params td:first-child, .param-table td:first-child { width: 46%; color: var(--muted); }
.param-table th { background: var(--dark); color: #fff; text-align: left; letter-spacing: 1px; }
.param-note { font-size: 12.5px; color: var(--muted); margin-top: 10px; }
.mat-facts { margin-top: 14px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.mat-facts li { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; font-size: 12.5px; }
.mat-facts span { display: block; color: var(--muted); }
.mat-facts b { color: var(--accent-dark); }
.feature-list { margin-bottom: 24px; }
.feature-list li { padding: 8px 0 8px 22px; position: relative; font-size: 14.5px; color: var(--ink-soft); border-bottom: 1px dashed var(--line); }
.feature-list li::before { content: ""; position: absolute; left: 4px; top: 16px; width: 7px; height: 7px; background: var(--accent); border-radius: 50%; }

/* ---------- 新闻内页 ---------- */
.news-layout { display: grid; grid-template-columns: 1fr 320px; gap: 44px; align-items: start; }
.news-list { display: flex; flex-direction: column; gap: 14px; }
.news-row {
  display: flex; gap: 18px; background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 16px 18px; transition: .25s; align-items: center;
}
.news-row:hover { box-shadow: var(--shadow); border-color: #c4d8ea; }
.news-row-thumb { width: 150px; flex-shrink: 0; border-radius: 10px; overflow: hidden; }
.news-row-thumb img { aspect-ratio: 16/10; object-fit: cover; width: 100%; }
.news-row-body h3 { font-size: 16.5px; font-weight: 600; }
.news-row-body p { font-size: 13.5px; color: var(--muted); margin: 6px 0 8px; }
.news-row-meta { font-size: 12.5px; color: var(--muted); }
.news-article { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 34px 38px; }
.article-meta { display: flex; gap: 18px; font-size: 13px; color: var(--muted); padding-bottom: 16px; border-bottom: 1px solid var(--line); margin-bottom: 22px; }
.article-cover { border-radius: 12px; overflow: hidden; margin-bottom: 22px; }
.article-content p { margin-bottom: 15px; color: var(--ink-soft); text-align: justify; font-size: 15.5px; }
.article-nav { display: flex; justify-content: space-between; gap: 14px; border-top: 1px solid var(--line); padding-top: 18px; margin-top: 10px; font-size: 13.5px; }
.article-nav a { color: var(--muted); max-width: 46%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.article-nav a:hover { color: var(--accent); }
.news-side { display: flex; flex-direction: column; gap: 18px; position: sticky; top: 100px; }
.side-box { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px 22px; }
.side-box h4 { font-family: var(--font-serif); font-size: 17px; margin-bottom: 12px; padding-bottom: 10px; border-bottom: 1px solid var(--line); }
.side-box ul li { padding: 7px 0; border-bottom: 1px dashed var(--line); font-size: 13.5px; }
.side-box ul li:last-child { border-bottom: 0; }
.side-box ul a { color: var(--ink-soft); display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.side-box ul a:hover { color: var(--accent); }
.side-box.contact-cta p { font-size: 13.5px; color: var(--muted); margin-bottom: 14px; }

/* ---------- 企业文化 & 时间线 ---------- */
.value-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.value-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px 22px; transition: .25s; }
.value-card:hover { box-shadow: var(--shadow); }
.value-card b { font-family: var(--font-serif); font-size: 18px; display: block; margin-bottom: 10px; color: var(--accent-dark); letter-spacing: 1px; }
.value-card p { font-size: 13.5px; color: var(--muted); }
.timeline { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.tl-item { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px 20px; position: relative; }
.tl-dot { position: absolute; top: -7px; left: 24px; width: 14px; height: 14px; background: var(--accent); border-radius: 50%; border: 3px solid var(--bg); }
.tl-item b { font-family: var(--font-serif); font-size: 16.5px; letter-spacing: 1px; display: block; margin-bottom: 6px; }
.tl-item p { font-size: 13px; color: var(--muted); }

/* ---------- 联系页 ---------- */
.contact-layout { display: grid; grid-template-columns: .95fr 1.05fr; gap: 44px; align-items: start; }
.contact-cards { display: flex; flex-direction: column; gap: 20px; }
.contact-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px 28px; }
.contact-card h3 { font-family: var(--font-serif); font-size: 19px; margin-bottom: 16px; padding-left: 12px; border-left: 4px solid var(--accent); }
.contact-card ul li { display: flex; padding: 8px 0; border-bottom: 1px dashed var(--line); font-size: 14.5px; }
.contact-card ul li:last-child { border-bottom: 0; }
.contact-card ul b { width: 80px; color: var(--muted); font-weight: 400; flex-shrink: 0; }
.contact-card.process ol li { padding: 10px 0; border-bottom: 1px dashed var(--line); }
.contact-card.process ol li:last-child { border-bottom: 0; }
.contact-card.process b { display: block; font-size: 15px; }
.contact-card.process span { font-size: 13px; color: var(--muted); }
.contact-form-wrap { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 32px 34px; }
.contact-form-wrap h2 { font-family: var(--font-serif); font-size: 24px; margin-bottom: 6px; }
.form-note { font-size: 13.5px; color: var(--muted); margin-bottom: 20px; }
.flash { padding: 10px 16px; border-radius: 10px; font-size: 14px; margin-bottom: 14px; }
.flash.ok { background: #e8f3e8; color: #2c6e31; border: 1px solid #cde5cf; }
.flash.error { background: #f9e9e7; color: #a23b2e; border: 1px solid #efd2ce; }
.form-row { margin-bottom: 16px; }
.form-row.two { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.form-row label { display: block; font-size: 13.5px; color: var(--ink-soft); margin-bottom: 6px; }
.form-row input, .form-row textarea {
  width: 100%; border: 1px solid var(--line); border-radius: 10px; padding: 11px 14px;
  font-size: 14.5px; font-family: inherit; background: #fff; outline: none; transition: .2s; resize: vertical;
}
.form-row input:focus, .form-row textarea:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(15, 147, 207, .12); }
.file-row { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.file-input {
  position: relative; display: inline-block; padding: 10px 22px; border: 1.5px dashed var(--accent);
  border-radius: 10px; color: var(--accent); font-size: 14px; cursor: pointer; background: var(--surface);
  transition: .2s;
}
.file-input:hover { background: var(--accent-soft); }
.file-input input { position: absolute; inset: 0; opacity: 0; cursor: pointer; }
.file-name { font-size: 13px; color: var(--muted); }

/* ---------- 页脚 ---------- */
.site-footer { background: var(--dark); color: #a7bcd0; margin-top: 0; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.3fr; gap: 40px; padding: 54px 24px 40px; }
.brand-inv .brand-mark { background: var(--accent); }
.brand-inv .brand-text b { color: #fff; }
.brand-inv .brand-text i { color: #7f97ad; }
.f-about p { font-size: 13.5px; margin-top: 16px; line-height: 1.8; }
.f-stats { display: flex; gap: 22px; margin-top: 18px; }
.f-stats span { font-size: 12px; }
.f-stats b { display: block; font-family: var(--font-serif); color: #74cdec; font-size: 20px; }
.f-col h4 { color: #fff; font-size: 15.5px; letter-spacing: 2px; margin-bottom: 16px; }
.f-col ul li { padding: 5px 0; font-size: 13.5px; }
.f-col ul a:hover { color: #74cdec; }
.f-contact ul li b { color: #7f97ad; font-weight: 400; width: 44px; display: inline-block; }
.footer-bar { border-top: 1px solid #1d3c5f; padding: 16px 0; font-size: 12.5px; }
.footer-bar-in { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; }
.footer-bar a { color: #7f97ad; }
.footer-bar a:hover { color: #74cdec; }
.back-top {
  position: fixed; right: 26px; bottom: 30px; width: 44px; height: 44px; border-radius: 50%;
  background: var(--accent); color: #fff; border: 0; font-size: 18px; cursor: pointer;
  opacity: 0; pointer-events: none; transition: .3s; box-shadow: var(--shadow); z-index: 90;
}
.back-top.show { opacity: 1; pointer-events: auto; }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .hero-in, .about-in, .pd-layout, .contact-layout, .news-layout { grid-template-columns: 1fr; }
  .hero-visual { min-height: 320px; }
  .hero-img.main { height: 300px; }
  .mat-grid, .prod-grid, .eq-grid, .cert-grid, .value-grid, .timeline { grid-template-columns: repeat(2, 1fr); }
  .pd-cols { grid-template-columns: 1fr; }
  .news-side { position: static; }
  .header-phone { display: none; }
  .nav-toggle { display: block; margin-left: auto; }
  .main-nav {
    display: none; position: absolute; top: 76px; left: 0; right: 0;
    background: var(--surface); border-bottom: 1px solid var(--line);
    flex-direction: column; align-items: stretch; padding: 10px 20px 18px; gap: 2px;
  }
  .main-nav.open { display: flex; }
  .drop-panel { position: static; display: none; box-shadow: none; border: 0; padding: 0 0 0 16px; }
  .nav-drop:hover .drop-panel { display: block; }
  .header-in { position: relative; }
}
@media (max-width: 640px) {
  .hero-copy h1 { font-size: 32px; }
  .sec-head h2 { font-size: 26px; }
  .prod-grid, .eq-grid, .cert-grid, .value-grid, .timeline, .mat-grid { grid-template-columns: 1fr; }
  .news-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 26px; }
  .section { padding: 52px 0; }
  .topbar-note { display: none; }
  .form-row.two { grid-template-columns: 1fr; }
  .news-article { padding: 22px 20px; }
  .filter-bar { flex-direction: column; align-items: stretch; }
  .search-form input { width: 100%; flex: 1; }
}

/* ---------- 阿尔特新增：工艺流程 / 随货文件 / 微信二维码 ---------- */
.timeline.process-timeline { grid-template-columns: 1fr; max-width: 860px; }
.tl-no {
  display: inline-grid; place-items: center;
  width: 30px; height: 30px; margin-right: 10px;
  background: var(--accent); color: #fff; border-radius: 8px;
  font-style: normal; font-size: 13px; font-weight: 700;
  transform: translateY(-3px);
}
.cert-doc {
  width: 100%; aspect-ratio: 4/3; display: grid; place-items: center;
  background: linear-gradient(135deg, #eaf3fa, #ddecf7);
}
.cert-doc span {
  width: 58px; height: 58px; display: grid; place-items: center;
  background: var(--accent); color: #fff; font-size: 26px; border-radius: 50%;
}
.contact-card.wechat { text-align: center; }
.wechat-qr { width: 190px; margin: 6px auto 10px; border: 1px solid var(--line); border-radius: 12px; overflow: hidden; }
.wechat-note { font-size: 13.5px; color: var(--muted); }

/* ---------- 品牌 Logo 图 ---------- */
.brand-logo { height: 42px; width: auto; display: block; flex-shrink: 0; }
.brand-inv .brand-logo { height: 36px; }