/* ============================================================
   SWT 官网复刻 · 视觉重构 v2
   方向：工业实用 / 蓝图工程感（Industrial Blueprint）
   展示字：Archivo Black（拉丁/数字） + 思源黑体系（中文）
   正文字：Microsoft YaHei / PingFang SC；数字与标注：IBM Plex Mono
   主色：#001689 深蓝｜强调：#ffd600 明黄｜基面：#f4f6f8 / #050f2e
   记忆点：坐标网格 + 角标括号 + 章节编号 + 等宽数字
   ============================================================ */
:root {
  --blue: #001689;
  --blue-2: #16309c;
  --blue-deep: #050f2e;
  --blue-deep-2: #0a1a4d;
  --yellow: #ffd600;
  --bg: #f4f6f8;
  --surface: #ffffff;
  --light: #e1edff;
  --text: #17181c;
  --gray: #6b7280;
  --line: #d9e2ef;
  --line-dark: rgba(255,255,255,.14);
  --font-display: "Archivo Black", "Microsoft YaHei", sans-serif;
  --font-mono: "IBM Plex Mono", "Microsoft YaHei", monospace;
  --font-body: "Microsoft YaHei", "PingFang SC", sans-serif;
  --radius: 4px;
  --shadow-1: 0 2px 8px rgba(5,15,46,.08);
  --shadow-2: 0 8px 28px rgba(5,15,46,.14);
  --shadow-3: 0 24px 64px rgba(5,15,46,.22);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --dur-fast: 160ms;
  --dur-base: 320ms;
  --dur-slow: 640ms;
  /* 蓝图网格纹理 */
  --grid-light:
    repeating-linear-gradient(0deg, rgba(0,22,137,.045) 0 1px, transparent 1px 56px),
    repeating-linear-gradient(90deg, rgba(0,22,137,.045) 0 1px, transparent 1px 56px);
  --grid-dark:
    repeating-linear-gradient(0deg, rgba(255,255,255,.05) 0 1px, transparent 1px 56px),
    repeating-linear-gradient(90deg, rgba(255,255,255,.05) 0 1px, transparent 1px 56px);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { font-family: var(--font-body); color: var(--text); background: var(--bg); font-size: 15px; letter-spacing: .01em; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; }
:focus-visible { outline: 2px solid var(--blue); outline-offset: 2px; }
.wrap { width: min(1240px, 92vw); margin: 0 auto; }

/* ---------- 章节编号标题（记忆点 ①） ---------- */
.sec { padding: 72px 0; position: relative; }
.sec.dark { background: linear-gradient(160deg, var(--blue-deep) 0%, var(--blue) 55%, var(--blue-2) 100%), var(--blue-deep); background-blend-mode: multiply; color: #fff; }
.sec.dark::before, .sec.light-grid::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
}
.sec.dark::before { background: var(--grid-dark); }
.sec-t { margin-bottom: 44px; display: flex; align-items: baseline; gap: 18px; border-bottom: 1px solid var(--line); padding-bottom: 16px; }
.sec.dark .sec-t { border-bottom-color: var(--line-dark); }
.sec-t .no { font-family: var(--font-mono); font-size: 13px; color: var(--blue); letter-spacing: .14em; border: 1px solid var(--blue); padding: 3px 10px; flex: none; }
.sec.dark .sec-t .no { color: var(--yellow); border-color: var(--yellow); }
.sec-t h2 { font-family: var(--font-display); font-size: clamp(26px, 3.2vw, 38px); letter-spacing: -.01em; color: var(--blue); line-height: 1.05; }
.sec.dark .sec-t h2 { color: #fff; }
.sec-t span { margin-left: auto; font-family: var(--font-mono); font-size: 12.5px; letter-spacing: .22em; text-transform: uppercase; color: var(--gray); }
.sec.dark .sec-t span { color: #9fb0e8; }

/* 角标括号（记忆点 ②）：卡片/主图 hover 时出现 */
.brackets { position: relative; }
.brackets::after {
  content: ""; position: absolute; inset: -8px; pointer-events: none; opacity: 0;
  background:
    linear-gradient(var(--yellow), var(--yellow)) left top / 14px 2px,
    linear-gradient(var(--yellow), var(--yellow)) left top / 2px 14px,
    linear-gradient(var(--yellow), var(--yellow)) right bottom / 14px 2px,
    linear-gradient(var(--yellow), var(--yellow)) right bottom / 2px 14px;
  background-repeat: no-repeat;
  transition: opacity var(--dur-base) var(--ease-out);
}
.brackets:hover::after { opacity: 1; }

/* ---------- 顶部导航 ---------- */
.header { position: sticky; top: 0; z-index: 100; background: var(--surface); border-bottom: 1px solid var(--line); }
.header .bar { width: min(1400px, 96vw); margin: 0 auto; height: 70px; display: flex; align-items: center; gap: 26px; }
.logo img { height: 42px; }
.nav { display: flex; height: 100%; flex: 1; justify-content: center; }
.nav > .item { position: relative; }
.nav > .item > a { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 1px; height: 70px; padding: 0 20px; font-size: 15px; color: var(--text); transition: color var(--dur-fast) ease-out; position: relative; }
.nav > .item > a::after { content: ""; position: absolute; left: 20px; right: 20px; bottom: 0; height: 3px; background: var(--yellow); transform: scaleX(0); transform-origin: left; transition: transform var(--dur-base) var(--ease-out); }
.nav > .item > a small { font-family: var(--font-mono); font-size: 10px; letter-spacing: .14em; color: var(--gray); text-transform: uppercase; }
.nav > .item:hover > a, .nav > .item.active > a { color: var(--blue); font-weight: 700; }
.nav > .item:hover > a::after, .nav > .item.active > a::after { transform: scaleX(1); }
.nav .sub { position: absolute; top: 70px; left: 0; min-width: 220px; background: var(--surface); border: 1px solid var(--line); border-top: 3px solid var(--yellow); box-shadow: var(--shadow-2); opacity: 0; visibility: hidden; transform: translateY(8px); transition: .25s var(--ease-out); }
.nav > .item:hover .sub { opacity: 1; visibility: visible; transform: none; }
.nav .sub a { display: block; padding: 12px 18px; font-size: 13.5px; color: #333; border-bottom: 1px solid #f0f2f7; transition: background var(--dur-fast) ease-out; }
.nav .sub a:hover { background: var(--light); color: var(--blue); }
.header .tel { font-family: var(--font-mono); color: var(--blue-deep); background: var(--yellow); font-weight: 700; font-size: 15px; padding: 9px 16px; border-radius: 2px; letter-spacing: .06em; }
.header .lang { border: 1px solid var(--blue); color: var(--blue); background: transparent; font-family: var(--font-mono); font-size: 12.5px; letter-spacing: .08em; padding: 8px 14px; border-radius: 2px; transition: var(--dur-fast) ease-out; }
.header .lang:hover { background: var(--blue); color: #fff; }

/* ---------- Banner 轮播（左对齐 + 进度刻度） ---------- */
.banner { position: relative; height: 560px; overflow: hidden; background: var(--blue-deep); }
.banner .slide { position: absolute; inset: 0; background-size: cover; background-position: center; opacity: 0; transition: opacity .7s var(--ease-out); display: flex; flex-direction: column; align-items: flex-start; justify-content: center; color: #fff; padding: 0 max(6vw, 40px); }
.banner .slide.on { opacity: 1; }
.banner .slide::before { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(5,15,46,.82) 0%, rgba(5,15,46,.45) 55%, rgba(5,15,46,.15) 100%); }
.banner .slide::after { content: ""; position: absolute; inset: 0; background: var(--grid-dark); }
.banner .slide > * { position: relative; }
.banner .kicker { font-family: var(--font-mono); font-size: 13px; letter-spacing: .3em; color: var(--yellow); margin-bottom: 18px; }
.banner h2 { font-family: var(--font-display); font-size: clamp(34px, 4.6vw, 60px); letter-spacing: -.015em; line-height: 1.06; max-width: 720px; }
.banner p { margin-top: 18px; font-size: 16px; opacity: .88; max-width: 560px; line-height: 1.8; }
.btn-more { display: inline-flex; align-items: center; gap: 10px; margin-top: 30px; padding: 12px 30px; border: 1px solid var(--yellow); color: var(--yellow); font-size: 13.5px; letter-spacing: .12em; border-radius: 2px; transition: .25s var(--ease-out); background: transparent; }
.btn-more::after { content: "→"; transition: transform var(--dur-fast) ease-out; }
.btn-more:hover { background: var(--yellow); color: var(--blue-deep); }
.btn-more:hover::after { transform: translateX(4px); }
.banner .dots { position: absolute; bottom: 24px; left: max(6vw, 40px); transform: none; display: flex; gap: 14px; align-items: center; z-index: 2; }
.banner .dots i { width: 34px; height: 3px; border-radius: 0; background: rgba(255,255,255,.3); cursor: pointer; transition: background var(--dur-fast); position: relative; }
.banner .dots i.on { background: var(--yellow); }
.banner .dots i::after { content: attr(data-i); position: absolute; top: -22px; left: 0; font-family: var(--font-mono); font-size: 11px; color: rgba(255,255,255,.6); }
.banner .dots i.on::after { color: var(--yellow); }

/* 通用按钮 */
.btn-yellow { display: inline-flex; align-items: center; gap: 10px; width: max-content; margin: 40px auto 0; background: var(--yellow); color: var(--blue-deep); font-weight: 700; font-size: 13.5px; letter-spacing: .1em; padding: 13px 34px; border-radius: 2px; transition: .25s var(--ease-out); box-shadow: var(--shadow-1); }
.btn-yellow::after { content: "→"; transition: transform var(--dur-fast); }
.btn-yellow:hover { transform: translateY(-2px); box-shadow: var(--shadow-2); }
.btn-yellow:hover::after { transform: translateX(4px); }

/* ---------- 产品中心 ---------- */
.cate-pills { display: flex; flex-wrap: wrap; gap: 10px; justify-content: flex-start; margin-bottom: 34px; }
.pill { padding: 10px 18px; background: transparent; color: #cfd9f5; border: 1px solid rgba(255,255,255,.28); border-radius: 2px; font-size: 13.5px; letter-spacing: .04em; transition: var(--dur-fast) ease-out; }
.sec:not(.dark) .pill { color: var(--blue); border-color: var(--line); background: var(--surface); }
.pill:hover { border-color: var(--yellow); }
.pill.on { background: var(--yellow); color: var(--blue-deep); border-color: var(--yellow); font-weight: 700; }
.prod-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 14px; }
.prod-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; transition: transform var(--dur-base) var(--ease-out), box-shadow var(--dur-base), border-color var(--dur-fast); position: relative; }
.prod-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-2); border-color: var(--yellow); }
.prod-card .ph { background: var(--blue-deep-2); aspect-ratio: 1; display: flex; align-items: center; justify-content: center; padding: 16px; position: relative; }
.prod-card .ph::before { content: ""; position: absolute; inset: 0; background: var(--grid-dark); opacity: .6; }
.prod-card .ph img { max-height: 100%; object-fit: contain; position: relative; }
.prod-card .nm { padding: 12px; font-size: 12.5px; color: #333; text-align: center; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; border-top: 1px solid var(--line); }

/* ---------- 关于斯微特 / 数据统计 ---------- */
.about-grid { display: grid; grid-template-columns: 1.05fr 1fr; gap: 44px; align-items: center; }
.about-grid img { border-radius: var(--radius); box-shadow: var(--shadow-2); width: 100%; border: 1px solid var(--line); }
.about-grid .txt h3 { font-family: var(--font-display); font-size: 22px; color: var(--blue); margin-bottom: 14px; }
.about-grid .txt p { color: #3f4450; line-height: 1.95; font-size: 14.5px; text-align: justify; }
.stats-row { margin-top: 52px; display: grid; grid-template-columns: repeat(6, 1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.stat { padding: 22px 10px 18px; text-align: center; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); background: var(--surface); }
.stat b { font-family: var(--font-mono); font-variant-numeric: tabular-nums; font-size: 30px; font-weight: 700; color: var(--blue); }
.stat b i { font-style: normal; font-size: 13px; color: var(--blue); opacity: .7; }
.stat p { margin-top: 8px; color: var(--gray); font-size: 12.5px; letter-spacing: .06em; }

/* ---------- 品牌发展 ---------- */
.dev-circles { display: flex; justify-content: center; align-items: center; gap: 10px; flex-wrap: wrap; }
.dev-circle { width: 152px; height: 152px; border: 1px solid rgba(255,255,255,.4); border-radius: 50%; display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; padding: 12px; background: rgba(255,255,255,.04); backdrop-filter: blur(2px); transition: border-color var(--dur-base), transform var(--dur-base) var(--ease-out); }
.dev-circle:hover { border-color: var(--yellow); transform: translateY(-4px); }
.dev-circle b { color: var(--yellow); font-size: 14.5px; }
.dev-circle span { margin-top: 6px; font-size: 12px; opacity: .88; }
.dev-arrow { color: rgba(255,255,255,.5); font-size: 20px; font-family: var(--font-mono); }
.timeline { position: relative; margin-top: 48px; background: linear-gradient(rgba(6,20,80,.55), rgba(6,20,80,.55)), url('https://siweite123.oss-accelerate.aliyuncs.com/upload/debris/202608/96cb89d94f9ca59df4b86d875aacc7bc.jpg') center/cover; border: 1px solid rgba(255,255,255,.2); border-radius: var(--radius); padding: 96px 34px 76px; }
.timeline .track { position: relative; height: 2px; background: rgba(255,255,255,.4); margin: 0 30px; }
.timeline .dot { position: absolute; top: -5px; width: 12px; height: 12px; background: #fff; border-radius: 50%; transform: translateX(-50%); cursor: pointer; transition: var(--dur-fast); }
.timeline .dot.on { background: var(--yellow); box-shadow: 0 0 0 5px rgba(255,214,0,.25); }
.timeline .yr { position: absolute; top: 16px; transform: translateX(-50%); font-size: 12px; color: rgba(255,255,255,.85); font-family: var(--font-mono); }
.timeline .pin { position: absolute; top: -46px; transform: translateX(-50%); font-size: 24px; color: #fff; }
.dev-panel { margin-top: 42px; color: #fff; max-width: 760px; margin-left: 60px; border-left: 3px solid var(--yellow); padding-left: 22px; }
.dev-panel h4 { color: var(--yellow); font-size: 17px; margin-bottom: 12px; font-family: var(--font-mono); letter-spacing: .1em; }
.dev-panel p { line-height: 1.95; font-size: 14px; opacity: .95; }

/* ---------- 企业实力 ---------- */
.power-tabs { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-bottom: 30px; }
.power-tab { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 18px; display: flex; gap: 12px; align-items: center; cursor: pointer; transition: var(--dur-fast) ease-out; position: relative; }
.power-tab::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 3px; background: var(--blue); opacity: 0; transition: var(--dur-fast); }
.power-tab:hover::before { opacity: 1; }
.power-tab .ic { width: 42px; height: 42px; border-radius: var(--radius); background: var(--light); color: var(--blue); display: flex; align-items: center; justify-content: center; font-size: 19px; flex: none; }
.power-tab b { font-size: 14.5px; color: var(--blue); display: block; }
.power-tab span { font-size: 12px; color: var(--gray); }
.power-tab.on { background: var(--blue); border-color: var(--blue); }
.power-tab.on .ic { background: rgba(255,255,255,.14); color: var(--yellow); }
.power-tab.on b { color: #fff; }
.power-tab.on span { color: #c6d2f5; }
.eq-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.eq-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-1); transition: transform var(--dur-base) var(--ease-out), box-shadow var(--dur-base); }
.eq-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-2); }
.eq-card img { height: 200px; width: 100%; object-fit: cover; }
.eq-card .bd { padding: 14px 16px; }
.eq-card b { color: var(--blue); font-size: 14.5px; }
.eq-card p { margin-top: 6px; color: var(--gray); font-size: 13px; line-height: 1.75; }

/* ---------- 展会 ---------- */
.expo-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.expo-card { background: rgba(255,255,255,.05); border: 1px solid rgba(255,255,255,.16); border-radius: var(--radius); overflow: hidden; transition: .25s var(--ease-out); }
.expo-card:hover { transform: translateY(-5px); border-color: var(--yellow); }
.expo-card img { height: 170px; width: 100%; object-fit: cover; }
.expo-card .bd { padding: 14px 16px; }
.expo-card b { font-size: 15px; line-height: 1.5; display: block; }
.expo-card p { margin-top: 8px; font-size: 13px; opacity: .8; line-height: 1.7; }
.expo-card .dt { margin-top: 10px; color: var(--yellow); font-size: 12.5px; font-family: var(--font-mono); letter-spacing: .06em; }

/* ---------- 解决方案 ---------- */
.sol-tabs { display: grid; grid-template-columns: repeat(7, 1fr); gap: 8px; margin-bottom: 30px; }
.sol-tab { background: var(--surface); border: 1px solid var(--line); color: var(--blue); border-radius: var(--radius); padding: 14px 6px; text-align: center; font-size: 13.5px; cursor: pointer; transition: var(--dur-fast); }
.sol-tab:hover { border-color: var(--blue); }
.sol-tab.on { background: var(--blue); color: #fff; border-color: var(--blue); font-weight: 700; }
.sol-cols { display: grid; grid-template-columns: 1.2fr 1fr 1fr; gap: 22px; align-items: start; }
.sol-col { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px 22px; min-height: 300px; }
.sol-col h4 { font-size: 15.5px; color: var(--blue); display: flex; align-items: center; justify-content: space-between; margin-bottom: 8px; cursor: pointer; letter-spacing: .05em; }
.sol-col h4::after { content: "→"; color: var(--blue); font-family: var(--font-mono); transition: transform var(--dur-fast); }
.sol-col h4:hover::after { transform: translateX(4px); }
.news-item { display: flex; gap: 12px; padding: 13px 0; border-bottom: 1px dashed var(--line); cursor: pointer; }
.news-item:hover b { color: var(--blue); }
.news-item img { width: 88px; height: 62px; object-fit: cover; border-radius: 2px; flex: none; }
.news-item b { font-size: 13.5px; line-height: 1.55; display: block; }
.news-item .meta { margin-top: 6px; color: var(--gray); font-size: 12px; font-family: var(--font-mono); }
.faq-item { background: transparent; border-bottom: 1px dashed var(--line); padding: 14px 0; margin-bottom: 0; cursor: pointer; }
.faq-item b { font-size: 13.5px; color: #333; display: flex; align-items: center; gap: 8px; }
.faq-item b::before { content: "+"; font-family: var(--font-mono); color: var(--blue); transition: transform var(--dur-fast); }
.faq-item.open b::before { transform: rotate(45deg); }
.faq-item p { margin-top: 10px; font-size: 13px; color: var(--gray); line-height: 1.75; display: none; }
.faq-item.open p { display: block; }

/* ---------- 企业风采 ---------- */
.album-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.album-item { position: relative; border-radius: var(--radius); overflow: hidden; aspect-ratio: 4/3; background: var(--blue-deep-2); border: 1px solid rgba(255,255,255,.1); }
.album-item img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s var(--ease-out); }
.album-item:hover img { transform: scale(1.07); }
.album-item span { position: absolute; left: 0; right: 0; bottom: 0; padding: 20px 12px 10px; background: linear-gradient(transparent, rgba(5,15,46,.8)); color: #fff; font-size: 12.5px; }

/* ---------- 联系/留言 ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.form-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow-1); padding: 30px 34px; }
.form-card label { display: block; margin-bottom: 8px; }
.form-card .tag { display: inline-block; background: var(--light); color: var(--blue); font-size: 12.5px; font-weight: 600; letter-spacing: .06em; padding: 4px 12px; border-radius: 2px; border-left: 3px solid var(--blue); }
.form-card input, .form-card textarea { width: 100%; margin-top: 8px; border: 1px solid var(--line); border-radius: 2px; padding: 11px 14px; font-size: 14px; font-family: inherit; outline: none; background: #fbfcfe; transition: border-color var(--dur-fast); }
.form-card input:focus, .form-card textarea:focus { border-color: var(--blue); background: #fff; }
.form-card textarea { min-height: 96px; resize: vertical; }
.form-card .submit { width: 100%; margin-top: 18px; background: var(--blue); color: #fff; font-weight: 700; font-size: 14.5px; letter-spacing: .3em; padding: 13px; border-radius: 2px; transition: var(--dur-fast); }
.form-card .submit:hover { background: var(--blue-deep); }
.info-card { background: var(--blue-deep); color: #fff; border-radius: var(--radius); padding: 32px 34px; position: relative; overflow: hidden; }
.info-card::before { content: ""; position: absolute; inset: 0; background: var(--grid-dark); }
.info-card > * { position: relative; }
.info-card h3 { font-family: var(--font-display); font-size: 20px; margin-bottom: 18px; }
.info-card li { display: flex; gap: 10px; padding: 9px 0; font-size: 14px; opacity: .95; line-height: 1.6; }
.info-card .ic { color: var(--yellow); flex: none; }

/* ---------- 内页 banner / 列表页 ---------- */
.page-banner { height: 280px; background-size: cover; background-position: center; display: flex; flex-direction: column; align-items: flex-start; justify-content: center; color: #fff; position: relative; padding: 0 max(6vw, 40px); }
.page-banner::before { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(5,15,46,.78), rgba(5,15,46,.35)); }
.page-banner::after { content: ""; position: absolute; inset: 0; background: var(--grid-dark); }
.page-banner > * { position: relative; z-index: 1; }
.page-banner h1 { font-family: var(--font-display); font-size: clamp(28px, 3.4vw, 42px); letter-spacing: 0; line-height: 1.1; }
.page-banner p { margin-top: 12px; opacity: .9; font-family: var(--font-mono); font-size: 13px; letter-spacing: .2em; text-transform: uppercase; }
.list-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.cert-grid img { width: 100%; aspect-ratio: 4/3; object-fit: cover; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); }
.news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.news-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-1); cursor: pointer; transition: transform var(--dur-base) var(--ease-out), box-shadow var(--dur-base); }
.news-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-2); }
.news-card img { height: 180px; width: 100%; object-fit: cover; }
.news-card .bd { padding: 16px 18px; }
.news-card b { font-size: 14.5px; line-height: 1.6; color: #222; }
.news-card p { margin-top: 8px; color: var(--gray); font-size: 13px; line-height: 1.7; }
.news-card .dt { margin-top: 10px; color: var(--blue); font-size: 12.5px; font-family: var(--font-mono); letter-spacing: .05em; }
.article { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow-1); padding: 44px 52px; max-width: 960px; margin: 0 auto; }
.article h1 { font-family: var(--font-display); font-size: 26px; color: var(--blue); line-height: 1.4; }
.article .meta { margin: 14px 0 26px; color: var(--gray); font-size: 13px; font-family: var(--font-mono); }
.article .body { line-height: 2.05; color: #333; font-size: 15px; }
.article .body img { margin: 14px 0; border-radius: 4px; }

/* 产品详情 */
.pd-grid { display: grid; grid-template-columns: 460px 1fr; gap: 40px; align-items: start; }
.pd-photos .main { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; }
.pd-photos .main img { max-height: 360px; margin: 0 auto; object-fit: contain; }
.pd-thumbs { display: flex; gap: 10px; margin-top: 12px; }
.pd-thumbs img { width: 68px; height: 68px; object-fit: contain; background: var(--surface); border: 1px solid var(--line); border-radius: 2px; cursor: pointer; padding: 6px; transition: border-color var(--dur-fast); }
.pd-thumbs img.on, .pd-thumbs img:hover { border-color: var(--blue); }
.pd-info h1 { font-family: var(--font-display); font-size: 26px; color: var(--blue); line-height: 1.4; }
.pd-info .series { display: inline-block; margin: 12px 0 16px; background: var(--light); color: var(--blue); font-size: 12.5px; padding: 5px 12px; border-radius: 2px; font-family: var(--font-mono); letter-spacing: .06em; }
.pd-info .intro { color: #3f4450; line-height: 1.95; font-size: 14.5px; }
.pd-docs { margin-top: 22px; display: flex; flex-direction: column; gap: 10px; }
.pd-docs a { display: flex; align-items: center; gap: 10px; background: var(--light); border: 1px solid transparent; border-radius: var(--radius); padding: 12px 16px; font-size: 14px; color: var(--blue); transition: border-color var(--dur-fast); }
.pd-docs a:hover { border-color: var(--blue); }
.spec-table { width: 100%; border-collapse: collapse; margin-top: 10px; }
.spec-table td { border: 1px solid var(--line); padding: 10px 12px; font-size: 13.5px; }
.spec-table td:first-child { background: var(--light); color: var(--blue); width: 180px; font-weight: 600; }

/* ---------- 页脚 ---------- */
.footer { background: var(--blue-deep); color: #b9c4e6; padding: 52px 0 0; position: relative; }
.footer::before { content: ""; position: absolute; inset: 0; background: var(--grid-dark); pointer-events: none; }
.footer .wrap { position: relative; }
.footer .cols { display: grid; grid-template-columns: 1.2fr 2.6fr .8fr; gap: 40px; padding-bottom: 36px; }
.footer h5 { color: #fff; font-size: 14px; margin-bottom: 14px; font-family: var(--font-mono); letter-spacing: .16em; }
.footer .fnav { display: grid; grid-template-columns: repeat(6, auto); gap: 4px 26px; font-size: 13px; }
.footer .fnav a { display: block; padding: 4px 0; opacity: .85; transition: color var(--dur-fast); }
.footer .fnav a:hover { color: var(--yellow); opacity: 1; }
.footer .contact { font-size: 13.5px; line-height: 2.1; }
.footer .contact b { color: var(--yellow); font-family: var(--font-mono); }
.footer .qrs { display: flex; gap: 14px; }
.footer .qrs img { width: 84px; height: 84px; border-radius: 4px; background: #fff; }
.footer .qrs span { display: block; text-align: center; font-size: 12px; margin-top: 6px; }
.footer .copy { border-top: 1px solid rgba(255,255,255,.12); padding: 16px 0; text-align: center; font-size: 12px; opacity: .65; font-family: var(--font-mono); letter-spacing: .05em; }

/* ---------- 浮动侧栏 / 通用 ---------- */
.side-fab { position: fixed; right: 16px; bottom: 120px; z-index: 90; display: flex; flex-direction: column; gap: 8px; }
.side-fab button { width: 44px; height: 44px; border-radius: var(--radius); background: var(--blue); color: #fff; font-size: 17px; opacity: .92; transition: var(--dur-fast); border: 1px solid transparent; }
.side-fab button:hover { background: var(--yellow); color: var(--blue-deep); border-color: var(--yellow); }
.empty { text-align: center; color: var(--gray); padding: 60px 0; font-family: var(--font-mono); letter-spacing: .1em; }
.crumbs { padding: 16px 0; color: var(--gray); font-size: 12.5px; font-family: var(--font-mono); letter-spacing: .04em; }
.crumbs a:hover { color: var(--blue); }

/* ---------- 入场动效（IntersectionObserver + 错峰） ---------- */
.page { animation: pagein var(--dur-base) var(--ease-out); }
@keyframes pagein { from { opacity: 0; transform: translateY(14px); } }
.reveal { opacity: 0; transform: translateY(26px); }
.reveal.in { opacity: 1; transform: none; transition: opacity var(--dur-slow) var(--ease-out), transform var(--dur-slow) var(--ease-out); }
@media (prefers-reduced-motion: reduce) {
  .reveal, .reveal.in { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
  * { animation-duration: .001s !important; transition-duration: .001s !important; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 1000px) {
  .prod-grid { grid-template-columns: repeat(3, 1fr); }
  .stats-row, .sol-tabs { grid-template-columns: repeat(3, 1fr); }
  .about-grid, .sol-cols, .contact-grid, .pd-grid, .power-tabs, .footer .cols { grid-template-columns: 1fr; }
  .news-grid, .eq-grid, .expo-grid { grid-template-columns: 1fr 1fr; }
  .album-grid, .list-grid { grid-template-columns: 1fr 1fr; }
  .header .bar { flex-wrap: wrap; height: auto; padding: 10px 0; gap: 12px; }
  .nav > .item > a { height: 44px; padding: 0 12px; font-size: 14px; }
  .banner { height: 440px; }
  .banner h2 { font-size: 30px; }
  .sec-t { flex-wrap: wrap; gap: 10px; }
  .sec-t span { margin-left: 0; width: 100%; }
}