/* XX 科技 · 官网样式（Vercel 浅色极简：黑白对比 + 细网格 + 单一强调色） */
:root {
  --bg: #ffffff;
  --surface: #fafafa;
  --fg: #000000;
  --muted: #666666;
  --dim: #8f8f8f;
  --line: #eaeaea;
  --line-strong: #d4d4d4;
  --brand: #0066ff;
  --brand-soft: #f0f5ff;
  --radius: 12px;
  --radius-sm: 6px;
  --container: 1120px;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--fg); font-family: var(--sans);
  font-size: 16px; line-height: 1.65; -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
h1, h2, h3, h4 { margin: 0; letter-spacing: -0.02em; font-weight: 600; }
p { margin: 0; }
ul { margin: 0; padding: 0; list-style: none; }
.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.mono { font-family: var(--mono); }

/* ---------- 导航 ---------- */
.nav {
  position: sticky; top: 0; z-index: 50; height: 64px;
  background: rgba(255, 255, 255, 0.82); backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav-inner { max-width: var(--container); margin: 0 auto; padding: 0 24px; height: 64px; display: flex; align-items: center; gap: 28px; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 600; font-size: 16px; letter-spacing: -0.01em; }
.logo-img { height: 38px; width: auto; display: block; }
.logo-img-footer { height: 58px; }
.logo-mark { width: 24px; height: 24px; border-radius: 6px; background: var(--fg); color: #fff; display: flex; align-items: center; justify-content: center; font-size: 12px; font-family: var(--mono); }
.nav-links { display: flex; align-items: center; gap: 24px; font-size: 14px; color: var(--muted); }
.nav-links a:hover { color: var(--fg); }
.nav-links a.active { color: var(--fg); }
.nav-cta { margin-left: auto; }

/* 下拉菜单（纯 CSS，hover 展开） */
.nav-item { position: relative; display: flex; align-items: center; }
.nav-item > a { display: flex; align-items: center; gap: 4px; height: 64px; color: var(--muted); }
.nav-item > a:hover { color: var(--fg); }
.nav-item .caret { font-size: 10px; color: var(--dim); }
.dropdown {
  position: absolute; top: 56px; left: 0; min-width: 190px; z-index: 60;
  background: #fff; border: 1px solid var(--line); border-radius: 10px;
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.09); padding: 6px;
  opacity: 0; visibility: hidden; transform: translateY(-5px);
  transition: opacity .15s ease, transform .15s ease, visibility .15s;
}
.nav-item:hover .dropdown, .nav-item:focus-within .dropdown { opacity: 1; visibility: visible; transform: translateY(0); }
.dropdown a { display: block; padding: 9px 12px; font-size: 14px; color: var(--fg); border-radius: 6px; }
.dropdown a:hover { background: var(--surface); }
.dropdown .dd-sub { display: block; font-size: 12px; color: var(--dim); margin-top: 2px; }

/* 移动端汉堡导航（纯 CSS checkbox） */
.nav-toggle-check { display: none; }
.nav-toggle { display: none; margin-left: auto; width: 40px; height: 40px; align-items: center; justify-content: center; font-size: 20px; border: 1px solid var(--line-strong); border-radius: 8px; cursor: pointer; user-select: none; }
.mobile-menu { display: none; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  height: 40px; padding: 0 18px; border-radius: var(--radius-sm);
  font-size: 14px; font-weight: 500; border: 1px solid transparent; cursor: pointer;
  transition: background .15s ease, border-color .15s ease, color .15s ease;
}
.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { background: #0052cc; }
.btn-secondary { background: #fff; color: var(--fg); border-color: var(--line-strong); }
.btn-secondary:hover { border-color: var(--fg); }
.btn-sm { height: 32px; padding: 0 14px; font-size: 13px; }

/* ---------- Hero ---------- */
.hero { position: relative; padding: 88px 0 72px; border-bottom: 1px solid var(--line); overflow: hidden; }
.hero-grid {
  position: absolute; inset: 0; pointer-events: none;
  background-image: linear-gradient(to right, #f0f0f0 1px, transparent 1px), linear-gradient(to bottom, #f0f0f0 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 0%, #000 40%, transparent 100%);
  mask-image: radial-gradient(ellipse 70% 60% at 50% 0%, #000 40%, transparent 100%);
}
.hero-inner { position: relative; }
.badge {
  display: inline-flex; align-items: center; gap: 8px; height: 28px; padding: 0 12px;
  border: 1px solid var(--line-strong); border-radius: 999px; background: #fff;
  font-size: 12px; color: var(--muted); font-family: var(--mono);
}
.hero h1 { font-size: clamp(32px, 5.2vw, 56px); line-height: 1.15; margin: 24px 0 20px; max-width: 16em; }
.hero-sub { font-size: 18px; color: var(--muted); max-width: 34em; line-height: 1.7; text-align: justify; }
.hero-actions { display: flex; gap: 12px; margin-top: 32px; flex-wrap: wrap; }
.hero-note { margin-top: 20px; font-size: 13px; color: var(--dim); }

/* ---------- Hero 背景横幅（主页全幅 / 产品页窄幅） ---------- */
.hero-banner {
  position: relative; background: #0a1430 url("../assets/hero-bg.jpg?v=2") center / cover no-repeat;
  color: #fff; min-height: 373px; display: flex; align-items: flex-end; border-bottom: 1px solid var(--line);
}
.hero-banner .hero-banner-inner { position: relative; z-index: 2; width: 100%; padding: 0 0 36px; display: flex; flex-direction: column; align-items: flex-end; text-align: right; }
.hero-banner .hero-actions { margin-top: 0; }
.hero-banner .btn-secondary { background: rgba(255, 255, 255, 0.12); color: #fff; border-color: rgba(255, 255, 255, 0.4); backdrop-filter: blur(4px); }
.hero-banner .btn-secondary:hover { border-color: #fff; }
.hero-banner .btn-primary { background: #fff; color: #0a1430; }
.hero-banner .btn-primary:hover { background: #e8ecf5; }
.hero-banner .hero-note { color: rgba(255, 255, 255, 0.75); }
.page-banner {
  background: #0a1430 url("../assets/hero-bg.jpg?v=2") center 30% / cover no-repeat;
  min-height: 180px; display: flex; align-items: flex-end; color: #fff;
  border-bottom: 1px solid var(--line);
}
.page-banner .container { width: 100%; padding: 0 24px 22px; }
.page-banner .badge { border-color: rgba(255, 255, 255, 0.45); background: rgba(255, 255, 255, 0.1); color: rgba(255, 255, 255, 0.92); backdrop-filter: blur(4px); }

/* 首页：横幅紧贴下一个板块，留白减半 */
.hero-banner + .section { padding-top: 36px; }

/* ---------- 页脚备案信息留白区 ---------- */
.record-strip { background: #fff; border-top: 1px solid var(--line); padding: 48px 0; text-align: center; }
.record-strip p { font-size: 13px; color: var(--dim); margin: 6px 0; }
.record-strip .record-company { font-size: 14px; color: var(--muted); font-weight: 500; }
.record-strip .mono { letter-spacing: 0; }

/* ---------- 通用区块 ---------- */
.section { padding: 48px 0; border-bottom: 1px solid var(--line); }
.section.alt { background: var(--surface); }
.kicker { font-family: var(--mono); font-size: 12px; color: var(--brand); letter-spacing: .04em; }
.slogan { font-size: clamp(28px, 4vw, 42px); letter-spacing: .01em; }
.slogan .em { color: var(--brand); }
.section-note { margin-top: 32px; font-size: 13px; color: var(--dim); text-align: center; }
.section h2 { font-size: clamp(24px, 3vw, 34px); margin: 12px 0 12px; }
.section-lead { color: var(--muted); max-width: 40em; text-align: justify; }
.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; margin-top: 40px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; margin-top: 40px; }
.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px; transition: border-color .15s ease;
  display: flex; flex-direction: column;
}
.card .mono + h3 { margin-top: 8px; }
.card .card-link { margin-top: auto; padding-top: 18px; }
.feature-list li { line-height: 1.75; }
.card:hover { border-color: var(--line-strong); }
.card h3 { font-size: 17px; margin-bottom: 10px; }
.card p { font-size: 14.5px; color: var(--muted); text-align: justify; }
.card .mono { font-size: 12px; color: var(--dim); }
.card-link { display: inline-flex; align-items: center; gap: 6px; margin-top: 16px; font-size: 14px; color: var(--brand); }
.card-link:hover { text-decoration: underline; }
.feature-list { margin-top: 14px; margin-bottom: 18px; display: grid; gap: 8px; }
.feature-list li { font-size: 14px; color: var(--muted); padding-left: 16px; position: relative; text-align: justify; }
.feature-list li::before { content: ""; position: absolute; left: 0; top: 10px; width: 5px; height: 5px; border-radius: 50%; background: var(--line-strong); }

/* ---------- 数据条 ---------- */
.stats { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.stat { background: #fff; padding: 24px; }
.stat .num { font-size: 30px; font-weight: 600; letter-spacing: -0.03em; }
.stat .label { font-size: 13px; color: var(--muted); margin-top: 4px; }

/* ---------- 产品页 ---------- */
.product-hero { padding: 72px 0 56px; border-bottom: 1px solid var(--line); }
.product-hero h1 { font-size: clamp(28px, 4vw, 44px); margin: 18px 0 16px; }
.steps { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; margin-top: 36px; }
.step { border-top: 2px solid var(--brand); padding-top: 16px; }
.step .idx { font-family: var(--mono); font-size: 12px; color: var(--dim); }
.step h3 { font-size: 16px; margin: 6px 0 8px; }
.step p { font-size: 14px; color: var(--muted); text-align: justify; }
.table { width: 100%; border-collapse: collapse; margin-top: 28px; font-size: 14.5px; }
.table th, .table td { text-align: left; padding: 12px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
.table th { font-size: 13px; color: var(--dim); font-weight: 500; }
.table td.mono { font-family: var(--mono); font-size: 13px; white-space: nowrap; }
.price-row { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; margin-top: 28px; }
.price-card { border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; background: #fff; }
.price-card.recommended { border-color: var(--brand); }
.price-card .amount { font-size: 32px; font-weight: 600; letter-spacing: -0.03em; }
.price-card .amount span { font-size: 14px; font-weight: 400; color: var(--muted); margin-left: 6px; }
.price-card ul { margin-top: 14px; display: grid; gap: 8px; }
.price-card li { font-size: 14px; color: var(--muted); padding-left: 16px; position: relative; }
.price-card li::before { content: ""; position: absolute; left: 0; top: 10px; width: 5px; height: 5px; border-radius: 50%; background: var(--brand); }
.callout { background: var(--brand-soft); border: 1px solid #cfe0ff; border-radius: var(--radius); padding: 18px 20px; margin-top: 28px; font-size: 14px; color: #0b3d91; }
.disclaimer { margin-top: 28px; font-size: 13px; color: var(--dim); line-height: 1.8; }

/* ---------- 关于 / 隐私 ---------- */
.prose { max-width: 44em; }
.prose h2 { font-size: 22px; margin: 40px 0 12px; }
.prose h3 { font-size: 17px; margin: 28px 0 8px; }
.prose p, .prose li { font-size: 15px; color: #333; margin-bottom: 12px; }
.prose ul { display: grid; gap: 6px; margin-bottom: 12px; }
.prose ul li { padding-left: 18px; position: relative; margin-bottom: 4px; }
.prose ul li::before { content: ""; position: absolute; left: 0; top: 11px; width: 5px; height: 5px; border-radius: 50%; background: var(--line-strong); }
.info-table { width: 100%; border-collapse: collapse; margin-top: 20px; font-size: 14.5px; }
.info-table th, .info-table td { text-align: left; padding: 12px 14px; border-bottom: 1px solid var(--line); }
.info-table th { width: 180px; color: var(--dim); font-weight: 500; font-size: 13px; }

/* ---------- 页脚 ---------- */
.footer { padding: 56px 0 40px; background: var(--surface); border-top: 1px solid var(--line); }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 32px; }
.footer h4 { font-size: 13px; margin-bottom: 14px; }
.footer li { font-size: 14px; color: var(--muted); margin-bottom: 8px; }
.footer li a:hover { color: var(--fg); }
.footer-bottom {
  max-width: var(--container); margin: 40px auto 0; padding: 20px 24px 0; border-top: 1px solid var(--line);
  display: flex; gap: 16px; flex-wrap: wrap; align-items: center; font-size: 13px; color: var(--dim);
}
.footer-bottom .links { display: flex; gap: 16px; margin-left: auto; flex-wrap: wrap; }

@media (max-width: 900px) {
  .grid-3, .grid-2, .stats, .steps, .price-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .nav-links, .nav-cta { display: none; }
  .nav-toggle { display: flex; }
  .mobile-menu { position: absolute; top: 64px; left: 0; right: 0; z-index: 55; background: #fff; border-bottom: 1px solid var(--line); box-shadow: 0 12px 24px rgba(0, 0, 0, 0.06); }
  .nav-toggle-check:checked ~ .mobile-menu { display: block; }
  .mobile-menu .mm-group { padding: 12px 24px 10px; border-top: 1px solid var(--line); }
  .mobile-menu .mm-group:first-child { border-top: none; }
  .mobile-menu .mm-title { font-size: 12px; color: var(--dim); font-family: var(--mono); margin-bottom: 6px; }
  .mobile-menu a { display: block; padding: 9px 0; font-size: 15px; color: var(--fg); }
  .hero-banner { min-height: 240px; background-position: center 30%; }
  .hero-banner .hero-banner-inner { align-items: center; text-align: center; padding: 0 0 28px; }
  .page-banner { min-height: 140px; }
  .hero { padding: 56px 0 48px; }
  .section { padding: 48px 0; }
}

/* 在研产品占位卡：内容水平垂直居中 */
.card-center { display: flex; flex-direction: column; justify-content: center; align-items: center; text-align: center; }

/* ---------- 手机窄屏适配 ---------- */
@media (max-width: 560px) {
  .container { padding: 0 16px; }
  .nav-inner { padding: 0 16px; }
  .hero-banner { min-height: 190px; }
  .section { padding: 34px 0; }
  .card { padding: 18px 16px; }
  .grid-3, .grid-2 { gap: 12px; }
  .section h2 { font-size: 24px; }
  .slogan { font-size: 24px; }
  .card h3 { font-size: 16px; }
  .card .mono + h3 { margin-top: 6px; }
  .feature-list { gap: 8px; margin-top: 12px; margin-bottom: 16px; }
  .feature-list li { font-size: 13px; line-height: 1.8; }
  .card .card-link { padding-top: 12px; font-size: 13.5px; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; }
  .card .btn { width: 100%; justify-content: center; }
  .section-note { margin-top: 20px; padding: 0 6px; font-size: 12px; line-height: 1.7; }
  /* 产品页 */
  .product-hero { padding: 40px 0 32px; }
  .product-hero h1 { font-size: 25px; }
  .hero-sub { font-size: 15px; }
  .hero-note { font-size: 12px; }
  .steps { gap: 14px; margin-top: 20px; }
  .step p { font-size: 13px; line-height: 1.8; }
  /* 表格转堆叠布局（防三列挤爆错行） */
  .table { margin-top: 18px; font-size: 13.5px; }
  .table thead { display: none; }
  .table tr { display: block; padding: 12px 0 10px; border-bottom: 1px solid var(--line); }
  .table tr:first-child { padding-top: 0; }
  .table td { display: block; padding: 2px 0; border-bottom: none; text-align: justify; }
  .table td:first-child { font-weight: 600; color: var(--fg); margin-bottom: 2px; }
  .table td.mono { white-space: normal; font-size: 12.5px; color: var(--dim); }
  /* 价格卡与提示 */
  .price-card { padding: 18px 16px; }
  .price-card .amount { font-size: 28px; }
  .price-card li { font-size: 13px; line-height: 1.75; text-align: justify; }
  .callout { padding: 14px 16px; font-size: 13px; margin-top: 20px; line-height: 1.8; }
  .disclaimer { font-size: 12px; margin-top: 20px; }
}

/* ---------- 价值观卡（诚实/高效/安全） ---------- */
.value-card { border-top: 3px solid var(--brand); }
.value-tag {
  display: inline-flex; align-items: center; height: 26px; padding: 0 12px;
  border-radius: 999px; background: var(--brand-soft); color: var(--brand);
  font-size: 13px; font-weight: 600; letter-spacing: .06em;
}
.value-card h3 { margin-top: 12px; }

/* 产品卡内按钮（贴底对齐） */
.card .btn { margin-top: auto; align-self: flex-start; }

/* 产品卡按钮：品牌蓝配色 */
.card .btn-primary { background: var(--brand); }
.card .btn-primary:hover { background: #0052cc; }
.card .btn-secondary { color: var(--brand); border-color: var(--brand); background: #fff; }
.card .btn-secondary:hover { background: var(--brand-soft); border-color: var(--brand); }

/* 产品卡标题用公司 logo 红 */
.prod-title { color: #af2026; }
.card-count { margin-top: 12px; font-size: 13px; color: var(--muted); }
.card-count b { color: #af2026; font-weight: 600; }