:root {
  --brand: #0052d9;            
  --brand-dark: #003a99;       
  --brand-soft: #eaf1ff;       
  --accent: #f4511e;           
  --accent-dark: #d84315;      
  --ink: #1f2430;              
  --muted: #6b7280;            
  --line: #e5e8ef;             
  --page-bg: #f6f8fc;          
  --card-bg: #ffffff;          
  --radius: 10px;              
  --shadow: 0 6px 24px rgba(31, 36, 48, .08); 
  --container: 1180px;         
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  line-height: 1.6;
  background: var(--page-bg);
}

img { max-width: 100%; display: block; }
a { color: var(--brand); text-decoration: none; }
a:hover { color: var(--brand-dark); text-decoration: underline; }
ul { list-style: none; }

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 20px;
}

.section-head { text-align: center; margin: 14px 0 10px; }
.section-head .eyebrow {
  display: inline-block;
  background: var(--brand-soft);
  color: var(--brand);
  font-size: 12px;
  font-weight: 600;
  padding: 3px 12px;
  border-radius: 999px;
}
.section-head h2 { font-size: 22px; margin: 6px 0 4px; }
.section-head p { color: var(--muted); font-size: 13px; max-width: 720px; margin: 0 auto; }

.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: #fff;
  border-bottom: 1px solid var(--line);
}
.site-nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 19px;
  font-weight: 700;
  color: var(--ink);
}
.brand .logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  background: linear-gradient(135deg, var(--brand), var(--brand-dark));
  color: #fff;
  border-radius: 8px;
  font-weight: 700;
  font-size: 17px;
}
.brand small { display: none; }

.nav-menu { display: flex; align-items: center; gap: 4px; }
.nav-menu a {
  display: block;
  padding: 6px 11px;
  font-size: 14px;
  color: var(--ink);
  font-weight: 500;
  border-radius: 8px;
}
.nav-menu a:hover { background: var(--brand-soft); text-decoration: none; }
.nav-menu a.active { background: var(--brand); color: #fff; font-weight: 600; }

.nav-menu a.nav-cta {
  background: var(--accent);
  color: #fff;
  font-weight: 600;
}
.nav-menu a.nav-cta:hover { background: var(--accent-dark); text-decoration: none; }

.nav-toggle { display: none; }
.nav-burger {
  display: none;
  flex-direction: column;
  gap: 4px;
  width: 26px;
  cursor: pointer;
}
.nav-burger span {
  display: block;
  height: 3px;
  border-radius: 2px;
  background: var(--ink);
}

.hero {
  background: linear-gradient(135deg, #003a99 0%, #0052d9 55%, #1668ff 100%);
  color: #fff;
  text-align: center;
  padding: 16px 20px 18px;
}
.hero h1 { font-size: 26px; line-height: 1.3; margin-bottom: 6px; }
.hero p { font-size: 14px; max-width: 760px; margin: 0 auto 4px; color: #d9e4ff; }

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-top: 8px;
  flex-wrap: wrap;
}
.hero-stats div strong { display: block; font-size: 18px; color: #ffd166; }
.hero-stats div span { font-size: 11.5px; color: #d9e4ff; }

.hero-actions { margin-top: 8px; display: flex; justify-content: center; gap: 12px; flex-wrap: wrap; }

.btn {
  display: inline-block;
  padding: 11px 24px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  text-align: center;
  border: none;
  cursor: pointer;
  transition: transform .12s ease, box-shadow .12s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-cta { background: var(--accent); color: #fff !important; box-shadow: 0 6px 18px rgba(244, 81, 30, .35); }
.btn-cta:hover { background: var(--accent-dark); }
.btn-ghost { background: rgba(255,255,255,.14); color: #fff !important; border: 1px solid rgba(255,255,255,.45); }
.btn-ghost:hover { background: rgba(255,255,255,.24); }
.btn-brand { background: var(--brand); color: #fff !important; }
.btn-brand:hover { background: var(--brand-dark); }

.offer-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.offer-card {
  position: relative;
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px 18px 18px;
  display: flex;
  flex-direction: column;
  text-align: center;
  overflow: hidden;
  transition: box-shadow .2s ease;
}
.offer-card:hover { box-shadow: 0 12px 34px rgba(31, 36, 48, .14); }

.offer-card.featured { border-color: var(--brand); }
.offer-card.featured::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 5px;
  background: linear-gradient(90deg, var(--brand), #1668ff);
}

.offer-badge {
  position: absolute;
  top: 0; left: 0;
  background: var(--accent);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  padding: 6px 14px;
  border-radius: 0 0 12px 0;
}
.offer-badge.is-old { background: var(--brand); }
.offer-card h3 { font-size: 18px; margin: 12px 0 6px; }
.offer-card .offer-desc { color: var(--muted); font-size: 13px; min-height: 34px; }

.offer-specs {
  margin: 8px 0;
  background: var(--page-bg);
  border-radius: 8px;
  padding: 6px 10px;
  text-align: left;
}
.offer-specs div {
  display: flex;
  justify-content: space-between;
  font-size: 12.5px;
  padding: 2px 0;
}
.offer-specs div + div { border-top: 1px dashed var(--line); }
.offer-specs span { color: var(--muted); }

.offer-tags { display: flex; justify-content: center; gap: 6px; flex-wrap: wrap; margin-bottom: 6px; }
.offer-tags span {
  background: var(--brand-soft);
  color: var(--brand);
  font-size: 12px;
  padding: 3px 10px;
  border-radius: 999px;
  font-weight: 600;
}

.offer-price { margin: 0 0 8px; }
.offer-price strong {
  font-size: 26px;
  color: var(--accent);
  line-height: 1.1;
}
.offer-price strong::before { content: "¥"; font-size: 17px; margin-right: 2px; }
.offer-price span { font-size: 12px; color: var(--muted); }
.offer-price del { color: var(--muted); opacity: .8; }

.offer-button {
  width: 100%;
  padding: 10px 0;
  font-size: 14px;
  border-radius: 8px;
  background: var(--accent);
  color: #fff !important;
  font-weight: 600;
  box-shadow: 0 5px 14px rgba(244, 81, 30, .3);
}
.offer-button:hover { background: var(--accent-dark); text-decoration: none; }

.use-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.use-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 26px 22px;
  text-align: left;
}
.use-card .use-icon {
  width: 46px;
  height: 46px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--brand), #1668ff);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 14px;
}
.use-card h3 { font-size: 18px; margin-bottom: 8px; }
.use-card p { color: var(--muted); font-size: 14px; }
.use-card a { display: inline-block; margin-top: 12px; font-size: 14px; font-weight: 600; }
@media (max-width: 680px) { .use-grid { grid-template-columns: 1fr; } }

.note {
  background: var(--brand-soft);
  border-left: 4px solid var(--brand);
  color: #12335f;
  padding: 12px 16px;
  border-radius: 0 8px 8px 0;
  font-size: 14px;
  margin: 26px 0;
}
.note strong { color: var(--brand-dark); }

.faq-list details {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px 20px;
  margin-bottom: 12px;
}
.faq-list summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 16px;
}
.faq-list p { color: var(--muted); font-size: 14px; margin-top: 10px; }

.content-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px;
  align-items: center;
  background: #fff;
  border-radius: var(--radius);
  padding: 40px;
  box-shadow: var(--shadow);
  margin-bottom: 28px;
}
.content-grid h3 { font-size: 22px; margin-bottom: 12px; }
.content-grid p { color: var(--muted); font-size: 15px; }
.content-grid ul { margin-top: 12px; }
.content-grid li { padding: 4px 0; color: var(--muted); font-size: 15px; }
.content-grid li::before { content: "✓"; color: var(--brand); font-weight: 700; margin-right: 8px; }
.content-visual {
  background: linear-gradient(135deg, var(--brand-soft), #fff);
  border: 1px solid var(--line);
  border-radius: 8px;
  min-height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--brand);
  font-weight: 700;
  font-size: 16px;
  text-align: center;
  padding: 20px;
}

.table-wrap { overflow-x: auto; background: #fff; border-radius: var(--radius); box-shadow: var(--shadow); }
.compare-table { width: 100%; border-collapse: collapse; font-size: 14px; min-width: 620px; }
.compare-table th, .compare-table td { padding: 12px 16px; text-align: center; border-bottom: 1px solid var(--line); }
.compare-table th { background: var(--brand); color: #fff; font-weight: 600; }
.compare-table tr:nth-child(even) td { background: var(--page-bg); }

.breadcrumb { padding: 14px 0 10px; font-size: 13px; color: var(--muted); text-align: center; }
.breadcrumb a { color: var(--muted); }
.breadcrumb a:hover { color: var(--brand); }
.breadcrumb span { margin: 0 6px; }

.site-footer {
  background: #16233b;
  color: #9fb2d0;
  margin-top: 56px;
  padding: 44px 0 28px;
}
.site-footer .container { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 30px; }
.site-footer h4 { color: #fff; font-size: 16px; margin-bottom: 12px; }
.site-footer a { color: #9fb2d0; display: inline-block; padding: 3px 0; }
.site-footer a:hover { color: #fff; }
.footer-brand p { margin: 12px 0 8px; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.1);
  margin-top: 32px;
  padding-top: 20px;
  grid-column: 1 / -1;
  text-align: center;
  font-size: 13px;
}

@media (max-width: 900px) {
  .offer-grid { grid-template-columns: repeat(2, 1fr); }
  .content-grid { grid-template-columns: 1fr; padding: 28px; }
  .site-footer .container { grid-template-columns: 1fr 1fr; }
  .hero h1 { font-size: 32px; }
}

@media (max-width: 680px) {
  .nav-burger { display: flex; }
  .nav-menu {
    display: none;
    position: absolute;
    top: 60px; left: 0; right: 0;
    background: #fff;
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    padding: 12px 20px 16px;
    box-shadow: var(--shadow);
  }

  .nav-menu.open { display: flex; }
  .nav-menu a { width: 100%; text-align: center; padding: 12px; }
  .offer-grid { grid-template-columns: 1fr; }
.hero { padding: 12px 16px 14px; }
.hero h1 { font-size: 20px; margin-bottom: 2px; }
.hero p { display: none; }
.hero-stats { gap: 12px; margin-top: 4px; }
.hero-stats div strong { font-size: 17px; }
.hero-stats div span { font-size: 11px; }
.hero-actions { margin-top: 4px; gap: 8px; }
.hero-actions .btn { padding: 9px 14px; font-size: 13px; }
.section-head { margin: 14px 0 10px; }
.section-head p { display: none; }
.section-head h2 { font-size: 20px; margin: 4px 0; }
.offer-card { padding: 14px 16px; }
.offer-card h3 { font-size: 17px; margin: 8px 0 4px; }
.offer-card .offer-desc { min-height: 0; font-size: 12.5px; }
.offer-specs { padding: 5px 8px; margin: 6px 0; }
.offer-specs div { padding: 1px 0; }
.offer-tags { gap: 4px; margin-bottom: 4px; }
.offer-price strong { font-size: 24px; }
.offer-price { margin-bottom: 6px; }
.note { display: none; }
.breadcrumb { display: none; }
  .site-footer .container { grid-template-columns: 1fr; }
}

@media (min-width: 769px) and (max-height: 820px) {
  .hero { padding: 10px 20px 12px; }
  .hero h1 { font-size: 24px; }
  .hero p { display: none; }
  .hero-stats { margin-top: 4px; gap: 16px; }
  .hero-stats div strong { font-size: 16px; }
  .hero-stats div span { display: none; }
  .hero-actions { margin-top: 6px; }
  .section-head { margin: 10px 0 8px; }
  .section-head p { display: none; }
  .offer-price strong { font-size: 24px; }
}