:root {
  --bg: #ffffff;
  --soft: #f5f8fc;
  --nav: #0f214a;
  --line: #d9e1ec;
  --text: #111111;
  --body: #333333;
  --muted: #63708a;
  --brand: #e31b23;
  --card: #ffffff;
  --shadow: 0 18px 40px rgba(15, 33, 74, 0.08);
  --radius: 22px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--body); font: 16px/1.75 "Microsoft YaHei","PingFang SC",sans-serif; }
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
.wrap { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }
.site-header { position: sticky; top: 0; z-index: 20; background: var(--nav); }
.nav-row { min-height: 72px; display: flex; align-items: center; gap: 20px; }
.brand img { height: 34px; width: auto; object-fit: contain; filter: brightness(0) invert(1); }
.nav { margin-left: auto; display: flex; gap: 22px; color: #eef3ff; }
.nav a, .header-cta { font-size: 14px; }
.header-cta { padding: 10px 18px; border-radius: 999px; background: var(--brand); color: #fff; font-weight: 700; }
.menu-toggle { display: none; margin-left: auto; border: 0; background: transparent; padding: 0; }
.menu-toggle span { display: block; width: 24px; height: 2px; margin: 5px 0; background: #fff; }
.hero { padding: 56px 0 40px; background: linear-gradient(180deg, #f7fafe, #ffffff); }
.hero-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 34px; align-items: center; }
.eyebrow { margin: 0; font-size: 12px; font-weight: 800; letter-spacing: .18em; color: var(--brand); }
.hero-copy h1, .section-head h2, .cta-box h2 { margin: 10px 0 16px; color: var(--text); line-height: 1.14; }
.hero-copy h1 { font-size: clamp(36px, 4.6vw, 58px); }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 28px; }
.btn { min-height: 48px; display: inline-flex; align-items: center; justify-content: center; padding: 0 22px; border-radius: 999px; font-weight: 700; }
.btn-primary { background: var(--brand); color: #fff; }
.btn-ghost { background: #fff; border: 1px solid var(--line); color: var(--nav); }
.hero-panel, .entry-grid article, .device-media, .faq-item, .cta-box { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }
.hero-panel { padding: 28px; }
.hero-panel h2 { margin: 0 0 16px; font-size: 28px; color: var(--nav); }
.hero-panel ul { list-style: none; padding: 0; margin: 0 0 18px; display: grid; gap: 14px; }
.hero-panel li { display: grid; gap: 4px; }
.hero-panel strong { color: var(--text); }
.hero-panel span { color: var(--muted); }
.hero-panel figure { margin: 0; overflow: hidden; border-radius: 18px; }
.hero-panel img { width: 100%; object-fit: contain; }
.section { padding: 72px 0; }
.section-soft { background: var(--soft); }
.section-faq { background: linear-gradient(180deg, #fff, #f7fafe); }
.section-head { max-width: 760px; margin-bottom: 28px; }
.section-head p { margin: 0; color: var(--muted); }
.entry-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.entry-grid article { padding: 26px; }
.entry-grid h3, .step-row h3, .compare strong { margin: 0 0 10px; color: var(--nav); }
.entry-grid p, .step-row p { margin: 0; color: var(--body); }
.device-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 24px; align-items: center; }
.compare { display: grid; gap: 12px; margin-top: 20px; }
.compare div { display: grid; gap: 4px; padding: 16px 18px; background: #fff; border-left: 4px solid var(--brand); }
.compare span { color: var(--muted); }
.device-media { margin: 0; padding: 22px; }
.step-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.step-row article { padding: 24px; border-top: 4px solid var(--nav); background: #fff; }
.step-row span { display: inline-flex; width: 44px; height: 44px; align-items: center; justify-content: center; border-radius: 999px; background: #eef3ff; color: var(--nav); font-weight: 800; margin-bottom: 14px; }
.faq-list { display: grid; gap: 14px; }
.faq-item { overflow: hidden; }
.faq-question { width: 100%; display: flex; justify-content: space-between; gap: 18px; padding: 18px 22px; border: 0; background: transparent; font: inherit; font-weight: 700; color: var(--text); text-align: left; cursor: pointer; }
.faq-question b { color: var(--brand); font-size: 24px; }
.faq-answer { display: none; padding: 0 22px 18px; color: var(--muted); }
.faq-item.open .faq-answer { display: block; }
.tag-cloud { display: flex; flex-wrap: wrap; gap: 12px; }
.tag-cloud span { padding: 11px 16px; border-radius: 999px; background: #eef3ff; color: var(--nav); border: 1px solid #d3def6; }
.cta-section { padding: 24px 0 72px; background: #fff; }
.cta-box { display: flex; justify-content: space-between; align-items: center; gap: 20px; padding: 28px 30px; background: linear-gradient(90deg, #0f214a, #183774); color: #fff; }
.cta-box h2 { color: #fff; max-width: 660px; }
@media (max-width: 980px) {
  .hero-grid, .entry-grid, .device-grid, .step-row { grid-template-columns: 1fr; }
  .nav { display: none; width: 100%; order: 4; flex-direction: column; padding-bottom: 16px; }
  .nav.open { display: flex; }
  .menu-toggle { display: block; }
  .header-cta { display: none; }
  .nav-row { flex-wrap: wrap; }
  .cta-box { flex-direction: column; align-items: flex-start; }
}
@media (max-width: 640px) {
  .wrap { width: min(100% - 24px, 1120px); }
  .section { padding: 56px 0; }
  .hero-copy h1 { font-size: 34px; }
}

.site-logo,
.logo img,
.brand img,
.header-logo img,
.nav-logo img {
  display: block;
  width: auto !important;
  height: auto !important;
  max-height: 40px !important;
  max-width: 180px !important;
  object-fit: contain !important;
}

.brand,
.logo,
.header-logo,
.nav-logo {
  overflow: visible !important;
}

.site-header .brand,
header .brand,
header .logo,
header .header-logo,
header .nav-logo {
  min-height: 40px;
  display: inline-flex;
  align-items: center;
}