/* ============================================================
   杭州超量光子科技有限公司 · 官网设计系统
   风格：简约大气 / 光电科技
   ============================================================ */

:root {
  /* 品牌色 */
  --ink: #0a0f1e;          /* 深邃墨蓝（主文字/深色块） */
  --ink-soft: #141b30;
  --navy: #0e1630;
  --slate: #475069;        /* 次要文字 */
  --muted: #8a93a8;        /* 弱化文字 */
  --line: #e7eaf1;         /* 分割线 */

  /* 光子渐变（匹配 EXAOPTO 蓝紫品牌色） */
  --photon-1: #60a5fa;     /* 亮蓝 */
  --photon-2: #2563eb;     /* 品牌蓝 */
  --photon-3: #7c3aed;     /* 品牌紫 */
  --grad: linear-gradient(120deg, #2563eb 0%, #4f46e5 50%, #7c3aed 100%);
  --grad-soft: linear-gradient(120deg, rgba(37,99,235,.14), rgba(124,58,237,.14));

  /* 背景 */
  --bg: #ffffff;
  --bg-soft: #f7f9fc;
  --bg-tint: #eef3fb;

  /* 尺寸 */
  --maxw: 1200px;
  --radius: 16px;
  --radius-lg: 24px;

  --shadow-sm: 0 1px 3px rgba(16,23,48,.06), 0 1px 2px rgba(16,23,48,.04);
  --shadow: 0 12px 32px -12px rgba(16,23,48,.18);
  --shadow-lg: 0 30px 60px -20px rgba(16,23,48,.28);

  --ease: cubic-bezier(.16,1,.3,1);
}

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

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

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB",
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

/* ---------- 布局容器 ---------- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}
.section { padding: 96px 0; }
.section--soft { background: var(--bg-soft); }
.section--dark {
  background: radial-gradient(1200px 600px at 70% -10%, rgba(59,130,246,.18), transparent 60%),
              radial-gradient(900px 500px at 10% 110%, rgba(34,211,238,.12), transparent 55%),
              var(--ink);
  color: #fff;
}

/* ---------- 文字工具 ---------- */
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; letter-spacing: .14em; font-weight: 600;
  text-transform: uppercase;
  color: var(--photon-2);
}
.eyebrow::before {
  content: ""; width: 22px; height: 2px; border-radius: 2px;
  background: var(--grad);
}
.section--dark .eyebrow { color: var(--photon-1); }

.h2 {
  font-size: clamp(26px, 3.4vw, 40px);
  line-height: 1.25; font-weight: 700; letter-spacing: -.01em;
  margin: 14px 0 0;
}
.lead { color: var(--slate); font-size: 17px; margin-top: 16px; max-width: 640px; }
.section--dark .lead { color: #c4ccdd; }

.text-grad {
  background: var(--grad); -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 26px; border-radius: 999px; font-weight: 600; font-size: 15px;
  cursor: pointer; border: 1px solid transparent; transition: all .3s var(--ease);
  white-space: nowrap;
}
.btn-primary { background: var(--grad); color: #fff; box-shadow: 0 10px 24px -8px rgba(59,130,246,.55); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 16px 32px -10px rgba(59,130,246,.6); }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--photon-2); color: var(--photon-2); }
.btn-light { background: #fff; color: var(--ink); }
.btn-light:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.btn-arrow svg { width: 16px; height: 16px; transition: transform .3s var(--ease); }
.btn-arrow:hover svg { transform: translateX(4px); }

/* ---------- 顶部导航 ---------- */
.header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  transition: all .35s var(--ease);
  padding: 18px 0;
}
.header.scrolled {
  background: rgba(255,255,255,.85);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  box-shadow: 0 1px 0 rgba(16,23,48,.06);
  padding: 12px 0;
}
.nav { display: flex; align-items: center; justify-content: space-between; }
.brand { display: flex; align-items: center; gap: 12px; font-weight: 700; font-size: 18px; }
.brand .logo {
  width: 42px; height: 42px; border-radius: 50%; flex: none;
  background: url(../img/logo.png) center/contain no-repeat;
  position: relative; box-shadow: 0 8px 22px -10px rgba(37,99,235,.45);
}
.brand .logo::after { display: none; }
.brand small { display: block; font-size: 11px; font-weight: 500; color: var(--muted); letter-spacing: .04em; }
.brand .name { line-height: 1.15; }

.nav-links { display: flex; align-items: center; gap: 6px; }
.nav-links a {
  padding: 9px 16px; border-radius: 999px; font-size: 15px; color: var(--slate);
  font-weight: 500; transition: all .25s var(--ease); position: relative;
}
.nav-links a:hover { color: var(--ink); }
.nav-links a.active { color: var(--ink); background: var(--bg-tint); }
.header:not(.scrolled) .nav-links a { color: rgba(255,255,255,.82); }
.header:not(.scrolled) .nav-links a:hover { color: #fff; }
.header:not(.scrolled) .nav-links a.active { color: #fff; background: rgba(255,255,255,.12); }
.header:not(.scrolled) .brand, .header:not(.scrolled) .brand small { color: #fff; }

.nav-cta { display: flex; align-items: center; gap: 12px; }
.nav-cta .btn { padding: 10px 20px; font-size: 14px; }
.header:not(.scrolled) .btn-ghost { color: #fff; border-color: rgba(255,255,255,.28); }
.header:not(.scrolled) .btn-ghost:hover { border-color: #fff; }

.menu-toggle { display: none; width: 42px; height: 42px; border: none; background: transparent; cursor: pointer; }
.menu-toggle span { display: block; width: 22px; height: 2px; background: currentColor; margin: 5px auto; transition: .3s var(--ease); border-radius: 2px; }
.header:not(.scrolled) .menu-toggle { color: #fff; }

/* ---------- Hero ---------- */
.hero {
  position: relative; min-height: 100vh; display: flex; align-items: center;
  padding-top: 120px; padding-bottom: 60px; overflow: hidden;
  background: radial-gradient(1100px 620px at 78% 8%, rgba(37,99,235,.22), transparent 58%),
              radial-gradient(900px 540px at 8% 96%, rgba(124,58,237,.16), transparent 55%),
              var(--ink);
  color: #fff;
}
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 48px; align-items: center; }
.hero h1 {
  font-size: clamp(34px, 5.2vw, 60px); line-height: 1.12; font-weight: 700;
  letter-spacing: -.02em; margin: 18px 0 0;
}
.hero .lead { color: #c4ccdd; margin-top: 22px; font-size: 18px; max-width: 520px; }
.hero-actions { display: flex; gap: 14px; margin-top: 34px; flex-wrap: wrap; }
.hero-meta { display: flex; gap: 28px; margin-top: 44px; flex-wrap: wrap; }
.hero-meta .item { }
.hero-meta .num { font-size: 28px; font-weight: 700; letter-spacing: -.01em; }
.hero-meta .lbl { font-size: 13px; color: #95a0b8; margin-top: 2px; }

/* 光波视觉 */
.hero-visual { position: relative; aspect-ratio: 1/1; }
.hero-visual svg { width: 100%; height: 100%; overflow: visible; }
.spin-slow { transform-origin: center; animation: spin 36s linear infinite; }
.spin-rev { transform-origin: center; animation: spin 52s linear infinite reverse; }
@keyframes spin { to { transform: rotate(360deg); } }
.float { animation: float 7s ease-in-out infinite; }
@keyframes float { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-12px); } }

/* 滚动提示 */
.scroll-cue {
  position: absolute; bottom: 26px; left: 50%; transform: translateX(-50%);
  font-size: 12px; color: #95a0b8; letter-spacing: .1em; display: flex; flex-direction: column;
  align-items: center; gap: 8px;
}
.scroll-cue .line { width: 1px; height: 34px; background: linear-gradient(#95a0b8, transparent); }

/* ---------- 卡片网格 ---------- */
.grid { display: grid; gap: 24px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 30px; transition: all .35s var(--ease); position: relative; overflow: hidden;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: transparent; }
.card .ico {
  width: 52px; height: 52px; border-radius: 14px; display: grid; place-items: center;
  background: var(--grad-soft); color: var(--photon-2); margin-bottom: 18px;
}
.card .ico svg { width: 26px; height: 26px; }
.card h3 { font-size: 19px; font-weight: 700; margin-bottom: 10px; }
.card p { color: var(--slate); font-size: 15px; }

/* 深色块卡片 */
.section--dark .card { background: rgba(255,255,255,.04); border-color: rgba(255,255,255,.1); }
.section--dark .card h3 { color: #fff; }
.section--dark .card p { color: #c4ccdd; }
.section--dark .card .ico { background: rgba(255,255,255,.08); color: var(--photon-1); }

/* ---------- 功能区展示（图文） ---------- */
.feature { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.feature + .feature { margin-top: 80px; }
.feature.rev .feature-text { order: 2; }
.feature-visual {
  border-radius: var(--radius-lg); padding: 40px; min-height: 320px;
  background: var(--grad-soft); border: 1px solid var(--line);
  display: grid; place-items: center; overflow: hidden; position: relative;
}
.feature-list { margin-top: 22px; display: grid; gap: 12px; }
.feature-list li { display: flex; gap: 12px; align-items: flex-start; color: var(--slate); }
.feature-list .dot { color: var(--photon-2); flex: none; margin-top: 3px; }
.feature-list .dot svg { width: 18px; height: 18px; }

/* ---------- 数据条 ---------- */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.stat { text-align: center; padding: 14px; }
.stat .num { font-size: clamp(30px, 4vw, 46px); font-weight: 800; letter-spacing: -.02em; }
.stat .lbl { color: #aeb8cc; font-size: 14px; margin-top: 6px; }

/* ---------- 时间轴 ---------- */
.timeline { position: relative; margin-top: 48px; padding-left: 4px; }
.timeline::before {
  content: ""; position: absolute; left: 18px; top: 8px; bottom: 8px; width: 2px;
  background: linear-gradient(var(--photon-1), var(--photon-3));
}
.tl-item { position: relative; padding: 0 0 36px 56px; }
.tl-item:last-child { padding-bottom: 0; }
.tl-item .node {
  position: absolute; left: 9px; top: 4px; width: 20px; height: 20px; border-radius: 50%;
  background: var(--grad); box-shadow: 0 0 0 5px rgba(59,130,246,.12);
}
.tl-item .year { font-weight: 700; color: var(--photon-2); font-size: 15px; }
.tl-item h4 { font-size: 18px; margin: 4px 0 6px; }
.tl-item p { color: var(--slate); font-size: 15px; }

/* ---------- 产品卡 ---------- */
.product {
  border: 1px solid var(--line); border-radius: var(--radius-lg); overflow: hidden;
  background: #fff; transition: all .35s var(--ease); display: flex; flex-direction: column;
}
.product:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: transparent; }
.product .top {
  padding: 32px 30px 26px; color: #fff; position: relative; overflow: hidden;
  background: radial-gradient(600px 300px at 100% 0%, rgba(124,58,237,.35), transparent), var(--navy);
}
.product .thumb {
  height: 220px; display: grid; place-items: center; padding: 24px;
  background: linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.02));
}
.product .thumb img { max-height: 100%; max-width: 100%; object-fit: contain; filter: drop-shadow(0 18px 28px rgba(0,0,0,.35)); }
.product-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.product-row { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.product-wide { grid-column: 1 / -1; }
.product .top .tag { font-size: 12px; letter-spacing: .12em; color: var(--photon-1); font-weight: 600; }
.product .top h3 { font-size: 21px; margin: 8px 0 0; }
.product .top p { color: #c4ccdd; font-size: 14px; margin-top: 8px; }
.product .body { padding: 26px 30px 30px; display: flex; flex-direction: column; gap: 14px; flex: 1; }
.product .body ul { display: grid; gap: 10px; }
.product .body li { display: flex; gap: 10px; font-size: 14.5px; color: var(--slate); }
.product .body li .dot { color: var(--photon-2); flex: none; margin-top: 3px; }
.product .body li .dot svg { width: 16px; height: 16px; }
.product .body .more { margin-top: auto; }

/* ---------- 服务流程 ---------- */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; counter-reset: step; }
.step { position: relative; padding: 28px 24px; border-radius: var(--radius); background: #fff; border: 1px solid var(--line); }
.step::before {
  counter-increment: step; content: "0" counter(step);
  font-size: 34px; font-weight: 800; background: var(--grad);
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.step h4 { font-size: 17px; margin: 10px 0 6px; }
.step p { font-size: 14px; color: var(--slate); }

/* ---------- CTA banner ---------- */
.cta {
  border-radius: var(--radius-lg); padding: 56px; text-align: center; position: relative; overflow: hidden;
  background: radial-gradient(700px 360px at 80% -20%, rgba(37,99,235,.3), transparent),
              radial-gradient(700px 360px at 0% 120%, rgba(124,58,237,.3), transparent),
              var(--navy); color: #fff;
}
.cta h2 { font-size: clamp(26px, 3.4vw, 38px); font-weight: 700; }
.cta p { color: #c4ccdd; max-width: 560px; margin: 14px auto 0; }
.cta .hero-actions { justify-content: center; }

/* ---------- 联系 ---------- */
.contact-wrap { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
.contact-info { display: grid; gap: 18px; }
.ci-item { display: flex; gap: 16px; align-items: flex-start; }
.ci-item .ico {
  width: 46px; height: 46px; border-radius: 12px; flex: none; display: grid; place-items: center;
  background: var(--grad-soft); color: var(--photon-2);
}
.ci-item .ico svg { width: 22px; height: 22px; }
.ci-item h4 { font-size: 15px; color: var(--muted); font-weight: 600; }
.ci-item p { font-size: 16px; color: var(--ink); }

.form { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 32px; }
.field { margin-bottom: 18px; }
.field label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 8px; }
.field input, .field textarea, .field select {
  width: 100%; padding: 12px 14px; border: 1px solid var(--line); border-radius: 10px;
  font-size: 15px; font-family: inherit; color: var(--ink); background: var(--bg-soft);
  transition: all .25s var(--ease);
}
.field input:focus, .field textarea:focus, .field select:focus {
  outline: none; border-color: var(--photon-2); background: #fff; box-shadow: 0 0 0 4px rgba(59,130,246,.12);
}
.field textarea { resize: vertical; min-height: 110px; }
.form .row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-note { font-size: 13px; color: var(--muted); margin-top: 6px; }
.form-ok {
  display: none; align-items: center; gap: 10px; padding: 14px 16px; border-radius: 10px;
  background: rgba(34,211,238,.12); color: #0e7490; font-size: 14px; margin-bottom: 16px;
}
.form-ok.show { display: flex; }

/* 地图占位 */
.map {
  margin-top: 16px; border-radius: var(--radius); overflow: hidden; border: 1px solid var(--line);
  height: 280px; position: relative; background:
    linear-gradient(rgba(14,22,48,.04), rgba(14,22,48,.04)),
    repeating-linear-gradient(0deg, #eef3fb 0 39px, #e6ecf6 39px 40px),
    repeating-linear-gradient(90deg, #eef3fb 0 39px, #e6ecf6 39px 40px);
}
.map .pin {
  position: absolute; left: 50%; top: 50%; transform: translate(-50%,-100%);
  width: 30px; height: 30px;
}
.map .pin::after {
  content: ""; position: absolute; left: 50%; top: 100%; transform: translateX(-50%);
  border: 8px solid transparent; border-top-color: var(--photon-2);
}
.map .pin span {
  position: absolute; left: 50%; top: 50%; transform: translate(-50%,-50%);
  width: 18px; height: 18px; border-radius: 50%; background: var(--grad);
  box-shadow: 0 0 0 6px rgba(59,130,246,.18);
}
.map .tag {
  position: absolute; left: 16px; bottom: 14px; background: #fff; padding: 8px 14px;
  border-radius: 999px; font-size: 13px; font-weight: 600; color: var(--ink);
  box-shadow: var(--shadow-sm);
}

/* ---------- 页脚 ---------- */
.footer { background: var(--ink); color: #aeb8cc; padding: 64px 0 28px; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 40px; }
.footer .brand { color: #fff; }
.footer .brand small { color: #7d879c; }
.footer h5 { color: #fff; font-size: 15px; margin-bottom: 16px; }
.footer-links li { margin-bottom: 10px; }
.footer-links a { color: #aeb8cc; font-size: 14px; transition: color .2s; }
.footer-links a:hover { color: var(--photon-1); }
.footer .about { font-size: 14px; max-width: 320px; margin-top: 16px; color: #95a0b8; }
.footer-bottom {
  margin-top: 48px; padding-top: 24px; border-top: 1px solid rgba(255,255,255,.08);
  display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap;
  font-size: 13px; color: #7d879c;
}
.footer-beian {
  margin-top: 16px; padding-top: 14px; border-top: 1px solid rgba(255,255,255,.08);
  display: flex; align-items: center; gap: 18px; flex-wrap: wrap;
  font-size: 13px; color: #7d879c;
}
.footer-beian a { color: #9aa6bd; text-decoration: none; }
.footer-beian a:hover { color: #c7d2fe; }
.footer-beian img { vertical-align: middle; }

/* ---------- 产品画廊（C级素材接入） ---------- */
.prod-gallery { gap: 20px; margin-top: 40px; }
.prod-gallery figure { margin: 0; padding: 14px; background: #fff; border: 1px solid var(--line); border-radius: 14px; }
.prod-gallery img { width: 100%; height: auto; border-radius: 10px; background: #f6f8fc; }
.prod-gallery figcaption { margin-top: 12px; font-size: 13px; color: #6b7280; text-align: center; }

/* ---------- 渐显动画 ---------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
.reveal.d1 { transition-delay: .08s; }
.reveal.d2 { transition-delay: .16s; }
.reveal.d3 { transition-delay: .24s; }
.reveal.d4 { transition-delay: .32s; }

/* ============================================================
   新站架构扩展：下拉导航 / 内页 Hero / 面包屑 / 表格 / FAQ
   ============================================================ */

/* 内页 Hero */
.hero--page { min-height: auto; padding-top: 150px; padding-bottom: 80px; }
.hero--page h1 { font-size: clamp(30px, 4.4vw, 50px); max-width: 840px; }
.hero--page .lead { max-width: 680px; }

/* 面包屑 */
.crumbs { display: flex; align-items: center; gap: 8px; font-size: 13px; color: #95a0b8; margin-bottom: 24px; flex-wrap: wrap; }
.crumbs a { color: #95a0b8; transition: color .2s; }
.crumbs a:hover { color: #fff; }
.crumbs .sep { opacity: .45; }
.crumbs > span:last-child { color: #c4ccdd; }

/* 下拉导航 */
.nav-links { gap: 6px; }
.nav-links > a { padding: 9px 16px; font-size: 15px; }
.nav-item > a { padding: 9px 12px; font-size: 14px; }
.nav-item { position: relative; display: flex; align-items: center; }
.nav-item > a { display: inline-flex; align-items: center; gap: 3px; }
.nav-item .car { width: 13px; height: 13px; opacity: .55; transition: transform .25s var(--ease); flex: none; }
.nav-item:hover .car { transform: rotate(180deg); }
.submenu {
  position: absolute; top: 100%; left: 50%;
  transform: translateX(-50%); min-width: 216px;
  background: #fff; border-radius: 14px; border: 1px solid var(--line);
  box-shadow: var(--shadow-lg); padding: 8px;
  display: none; opacity: 0; visibility: hidden;
  transition: opacity .22s var(--ease), visibility .22s;
  z-index: 130; pointer-events: none;
}
/* 透明桥接区：填补触发项与子菜单之间的空隙，鼠标经过时仍算 .nav-item:hover，避免子菜单消失 */
.submenu::before {
  content: ""; position: absolute; top: -14px; left: 0; right: 0; height: 14px;
}
.nav-item:hover .submenu, .nav-item:focus-within .submenu {
  display: block; opacity: 1; visibility: visible; pointer-events: auto;
}
.header .nav-links .nav-item .submenu a {
  display: block; padding: 9px 14px; border-radius: 9px;
  font-size: 14px; font-weight: 500; color: var(--slate); background: transparent;
  white-space: nowrap;
}
.header .nav-links .nav-item .submenu a:hover { background: var(--bg-tint); color: var(--ink); }

/* 卡片内链接 */
.card-link { display: inline-flex; align-items: center; gap: 6px; margin-top: 16px; font-size: 14px; font-weight: 600; color: var(--photon-2); }
.card-link svg { width: 15px; height: 15px; transition: transform .3s var(--ease); }
.card-link:hover svg { transform: translateX(4px); }
.section--dark .card-link { color: var(--photon-1); }

/* 标签 chips */
.chips { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 36px; }
.chip { padding: 9px 18px; border-radius: 999px; background: #fff; border: 1px solid var(--line); font-size: 14px; font-weight: 500; color: var(--slate); transition: all .25s var(--ease); }
a.chip:hover { border-color: var(--photon-2); color: var(--photon-2); transform: translateY(-1px); }

/* 说明框 */
.note { padding: 22px 26px; border-radius: 16px; background: #fff; border: 1px solid var(--line); color: var(--slate); font-size: 15px; }
.note .lead { margin-top: 10px; }

/* 规格/对比表格 */
.table-wrap { overflow-x: auto; border-radius: var(--radius); }
.spec-table { width: 100%; border-collapse: collapse; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; font-size: 14.5px; margin-top: 16px; }
.spec-table th, .spec-table td { padding: 12px 18px; text-align: left; border-bottom: 1px solid var(--line); vertical-align: top; line-height: 1.6; }
.spec-table thead th { background: var(--bg-tint); font-size: 13px; letter-spacing: .05em; color: var(--slate); font-weight: 600; }
.spec-table tbody th { width: 168px; color: var(--ink); font-weight: 600; background: var(--bg-soft); }
.spec-table tbody tr:last-child th, .spec-table tbody tr:last-child td { border-bottom: none; }
.spec-table.cmp tbody th { background: #fff; width: 150px; }
.spec-table.cmp td { color: var(--slate); }

/* FAQ 手风琴 */
.faq { display: grid; gap: 14px; margin-top: 48px; }
.faq-item { background: #fff; border: 1px solid var(--line); border-radius: 14px; overflow: hidden; transition: box-shadow .3s var(--ease); }
.faq-item[open] { box-shadow: var(--shadow); }
.faq-item summary { cursor: pointer; list-style: none; padding: 20px 24px; font-weight: 600; font-size: 16px; display: flex; justify-content: space-between; align-items: center; gap: 16px; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; font-size: 24px; line-height: 1; color: var(--photon-2); font-weight: 400; flex: none; transition: transform .25s var(--ease); }
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item .a { padding: 0 24px 22px; color: var(--slate); font-size: 15px; }

/* 文档下载列表 */
.doc-list { display: grid; gap: 14px; margin-top: 40px; }
.doc-item { display: flex; align-items: center; gap: 16px; background: #fff; border: 1px solid var(--line); border-radius: 14px; padding: 18px 22px; transition: all .3s var(--ease); }
.doc-item:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.doc-item .ico { width: 44px; height: 44px; border-radius: 12px; flex: none; display: grid; place-items: center; background: var(--grad-soft); color: var(--photon-2); }
.doc-item .ico svg { width: 22px; height: 22px; }
.doc-item h4 { font-size: 16px; }
.doc-item p { font-size: 13.5px; color: var(--muted); margin-top: 2px; }
.doc-item .go { margin-left: auto; flex: none; font-size: 14px; font-weight: 600; color: var(--photon-2); display: inline-flex; align-items: center; gap: 6px; }
.doc-item .go svg { width: 15px; height: 15px; }

/* 知识文章 */
.prose { max-width: 820px; }
.prose h3 { font-size: 22px; margin: 42px 0 12px; letter-spacing: -.01em; }
.prose h3:first-child { margin-top: 0; }
.prose p { color: var(--slate); margin-top: 12px; }
.prose ul { margin-top: 12px; display: grid; gap: 9px; }
.prose ul li { display: flex; gap: 10px; color: var(--slate); }
.prose ul li::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--grad); flex: none; margin-top: 11px; }
.prose b { color: var(--ink); }

/* ---------- 响应式 ---------- */
@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; gap: 24px; }
  .hero-visual { max-width: 420px; margin: 0 auto; }
  .feature, .contact-wrap { grid-template-columns: 1fr; gap: 32px; }
  .feature.rev .feature-text { order: 0; }
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .section { padding: 68px 0; }
  .nav-links, .nav-cta .btn-ghost { display: none; }
  .menu-toggle { display: block; }
  .header.open { background: #fff; }
  .header.open .nav-links {
    display: flex; flex-direction: column; align-items: stretch; gap: 4px;
    position: absolute; top: 100%; left: 0; right: 0; padding: 14px 24px 22px;
    background: #fff; box-shadow: var(--shadow); border-top: 1px solid var(--line);
  }
  .header.open .nav-links a { color: var(--ink); }
  .header.open .nav-links a.active { background: var(--bg-tint); }
  .header.open .nav-item { flex-direction: column; align-items: stretch; }
  .header.open .nav-item > a { justify-content: space-between; }
  .header.open .submenu {
    position: static; transform: none; opacity: 1; visibility: visible; display: block; pointer-events: auto;
    box-shadow: none; border: none; border-left: 2px solid var(--line);
    border-radius: 0; margin: 2px 0 8px 14px; padding: 2px 0 2px 10px; min-width: 0;
  }
  .header.open .nav-links .nav-item .submenu a { color: var(--slate); font-size: 13.5px; padding: 7px 10px; }
  .header.open .nav-links .nav-item .submenu a:hover { background: var(--bg-tint); }
  .header.open .menu-toggle { color: var(--ink); }
  .header.open .menu-toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .header.open .menu-toggle span:nth-child(2) { opacity: 0; }
  .header.open .menu-toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
  .cta { padding: 40px 24px; }
  .grid-2, .grid-3, .grid-4, .stats, .steps, .footer-grid { grid-template-columns: 1fr; }
  .form .row { grid-template-columns: 1fr; }
  .hero-meta { gap: 20px; }
}