:root {
  --mdy-blue: #1f5fc4;
  --mdy-blue-dark: #102b55;
  --mdy-cyan: #26b5d9;
  --mdy-ink: #17263b;
  --mdy-muted: #5f6f84;
  --mdy-line: #d9e2ef;
  --mdy-soft: #f4f7fb;
  --mdy-white: #fff;
  --mdy-radius: 12px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--mdy-ink); background: var(--mdy-white); font-size: 16px; line-height: 1.7; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; }

.site-header {
  position: sticky; top: 0; z-index: 30; height: 68px; padding: 0 44px;
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
  border-bottom: 1px solid rgba(217, 226, 239, .9); background: rgba(255,255,255,.95);
  backdrop-filter: blur(12px);
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; white-space: nowrap; }
.brand-mark { display: grid; place-items: center; width: 46px; height: 30px; border: 2px solid var(--mdy-blue-dark); border-radius: 5px; color: var(--mdy-blue-dark); font-size: 14px; }
.site-nav { display: flex; align-items: center; justify-content: center; gap: 24px; color: #44566f; font-size: 14px; }
.site-nav a:hover { color: var(--mdy-blue); }
.header-cta { display: inline-flex; align-items: center; min-height: 40px; padding: 0 17px; border: 1px solid var(--mdy-blue); border-radius: 8px; color: var(--mdy-blue); font-weight: 750; white-space: nowrap; }

.hero { padding: 76px 44px 68px; color: #fff; background: radial-gradient(circle at 82% 20%, rgba(38,181,217,.28), transparent 32%), linear-gradient(135deg, #0c2345 0%, #123b73 62%, #17698b 100%); }
.hero-inner, .section-inner, .quick-inner, .footer-inner { width: min(1180px, 100%); margin: 0 auto; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.12fr) minmax(320px, .88fr); gap: 54px; align-items: center; }
.eyebrow { margin: 0 0 12px; color: #63dbf2; font-size: 14px; font-weight: 850; letter-spacing: .04em; }
.hero h1 { max-width: 760px; margin: 0; font-size: clamp(38px, 5vw, 58px); line-height: 1.12; }
.hero-copy { max-width: 720px; margin: 22px 0 0; color: rgba(255,255,255,.88); font-size: 18px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 46px; padding: 0 21px; border: 1px solid transparent; border-radius: 8px; cursor: pointer; font-weight: 800; }
.button.primary { background: var(--mdy-blue); color: #fff; }
.button.primary:hover { background: #174fa9; }
.button.secondary { border-color: rgba(255,255,255,.58); background: rgba(255,255,255,.1); color: #fff; }
.button.light { border-color: var(--mdy-line); background: #fff; color: var(--mdy-ink); }
.hero-tags { display: flex; flex-wrap: wrap; gap: 9px; margin: 28px 0 0; padding: 0; list-style: none; }
.hero-tags li { padding: 7px 11px; border: 1px solid rgba(255,255,255,.3); border-radius: 999px; background: rgba(255,255,255,.09); color: rgba(255,255,255,.92); font-size: 14px; }

.hero-panel { padding: 26px; border: 1px solid rgba(255,255,255,.2); border-radius: 16px; background: rgba(255,255,255,.09); box-shadow: 0 24px 70px rgba(3,15,34,.26); }
.hero-panel h2 { margin: 0 0 18px; font-size: 18px; }
.mini-flow { display: grid; gap: 12px; }
.flow-step { position: relative; padding: 15px 16px; border: 1px solid rgba(255,255,255,.18); border-radius: 10px; background: rgba(255,255,255,.1); }
.flow-step + .flow-step::before { content: "↓"; position: absolute; top: -22px; left: 50%; color: #7ee4f4; transform: translateX(-50%); }
.flow-step strong, .flow-step span { display: block; }
.flow-step span { margin-top: 3px; color: rgba(255,255,255,.72); font-size: 13px; }

.quick-strip { border-bottom: 1px solid var(--mdy-line); background: #edf4f9; }
.quick-inner { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; padding: 18px 44px; }
.quick-inner strong { margin-right: 4px; }
.quick-inner span { padding: 4px 10px; border-radius: 999px; background: #fff; color: #455a72; font-size: 14px; }

.section { padding: 78px 44px; }
.section.soft { background: var(--mdy-soft); }
.section[id] { scroll-margin-top: 86px; }
.section-heading { max-width: 780px; margin-bottom: 34px; }
.section-heading.center { margin-right: auto; margin-left: auto; text-align: center; }
.section-heading h2 { margin: 0; font-size: clamp(28px, 4vw, 40px); line-height: 1.25; }
.section-heading p:last-child { margin: 14px 0 0; color: var(--mdy-muted); }
.card-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.card { padding: 25px; border: 1px solid var(--mdy-line); border-radius: var(--mdy-radius); background: #fff; }
.card-index { display: inline-grid; place-items: center; width: 38px; height: 38px; border-radius: 50%; background: #eaf2ff; color: var(--mdy-blue); font-weight: 850; }
.card h3 { margin: 16px 0 8px; font-size: 20px; }
.card p { margin: 0; color: var(--mdy-muted); }
.card ul { margin: 14px 0 0; padding-left: 20px; color: var(--mdy-muted); }

.product-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px; }
.product-card { position: relative; overflow: hidden; padding: 30px; border: 1px solid var(--mdy-line); border-radius: 14px; background: #fff; }
.product-card::after { content: ""; position: absolute; right: -38px; bottom: -42px; width: 160px; height: 160px; border-radius: 50%; background: #edf5ff; }
.product-badge { position: relative; z-index: 1; display: inline-block; padding: 5px 9px; border-radius: 999px; background: #e8f1ff; color: var(--mdy-blue); font-size: 13px; font-weight: 800; }
.product-card h3 { position: relative; z-index: 1; margin: 17px 0 8px; font-size: 24px; }
.product-card p { position: relative; z-index: 1; margin: 0; color: var(--mdy-muted); }
.product-links { position: relative; z-index: 1; display: flex; flex-wrap: wrap; gap: 12px; margin-top: 22px; }
.text-link { color: var(--mdy-blue); font-weight: 800; }
.text-link:hover { text-decoration: underline; }

.comparison { width: 100%; border-collapse: collapse; overflow: hidden; border: 1px solid var(--mdy-line); border-radius: 12px; background: #fff; }
.comparison th, .comparison td { padding: 17px 18px; border-bottom: 1px solid var(--mdy-line); text-align: left; vertical-align: top; }
.comparison th { background: #eaf2ff; color: #244466; }
.comparison tr:last-child td { border-bottom: 0; }

.diagram-frame { padding: 24px; border: 1px solid var(--mdy-line); border-radius: 14px; background: #fff; box-shadow: 0 18px 48px rgba(27,54,88,.07); }
.diagram-frame img { width: 100%; height: auto; }
.diagram-caption { margin: 14px 4px 0; color: var(--mdy-muted); font-size: 14px; text-align: center; }
.diagram-intro { margin: -6px auto 24px; padding: 18px 20px; max-width: 900px; border-left: 4px solid var(--mdy-blue); border-radius: 0 10px 10px 0; background: #eef5ff; color: #29435f; line-height: 1.8; }
.diagram-intro strong { color: #0d2f57; }
.diagram-guide { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 14px; margin: 0 0 24px; }
.diagram-guide-item { position: relative; padding: 20px 18px 18px; border: 1px solid var(--mdy-line); border-radius: 12px; background: #fff; box-shadow: 0 10px 28px rgba(27,54,88,.05); }
.diagram-guide-item::after { content: "→"; position: absolute; top: 50%; right: -12px; z-index: 1; width: 24px; height: 24px; border: 1px solid #c9daf0; border-radius: 50%; background: #fff; color: var(--mdy-blue); font-weight: 900; line-height: 22px; text-align: center; transform: translateY(-50%); }
.diagram-guide-item:last-child::after { display: none; }
.diagram-guide-index { display: inline-flex; align-items: center; justify-content: center; width: 30px; height: 30px; margin-bottom: 10px; border-radius: 50%; background: var(--mdy-blue); color: #fff; font-size: 13px; font-weight: 800; }
.diagram-guide-item h3 { margin: 0 0 7px; color: #102d4f; font-size: 17px; }
.diagram-guide-item p { margin: 0; color: var(--mdy-muted); font-size: 14px; line-height: 1.75; }
.diagram-result { margin: 18px 0 0; padding: 16px 18px; border-radius: 10px; background: #f5f8fc; color: #314963; line-height: 1.75; }
.diagram-result strong { color: #0d2f57; }

.steps { display: grid; grid-template-columns: repeat(4, minmax(0,1fr)); gap: 16px; counter-reset: step; }
.step { position: relative; padding: 24px 20px; border: 1px solid var(--mdy-line); border-radius: 12px; background: #fff; }
.step::before { counter-increment: step; content: "0" counter(step); display: block; margin-bottom: 12px; color: var(--mdy-blue); font-weight: 900; }
.step h3 { margin: 0 0 7px; font-size: 18px; }
.step p { margin: 0; color: var(--mdy-muted); font-size: 14px; }

.inquiry-layout { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(280px, .85fr); gap: 26px; align-items: start; }
.inquiry-form, .summary-card { padding: 28px; border: 1px solid var(--mdy-line); border-radius: 14px; background: #fff; }
.form-grid { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 16px; }
.field { display: grid; gap: 6px; }
.field.full { grid-column: 1 / -1; }
.field label { font-weight: 750; font-size: 14px; }
.field input, .field select, .field textarea { width: 100%; min-height: 44px; padding: 10px 12px; border: 1px solid #cbd7e6; border-radius: 8px; background: #fff; color: var(--mdy-ink); }
.field textarea { min-height: 110px; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus { outline: 2px solid rgba(31,95,196,.16); border-color: var(--mdy-blue); }
.form-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 20px; }
.form-state { min-height: 24px; margin: 12px 0 0; color: var(--mdy-muted); font-size: 14px; }
.form-state.success { color: #17834c; }
.form-state.error { color: #c0392b; }
.summary-card { position: sticky; top: 92px; }
.summary-card h3 { margin: 0 0 10px; }
.summary-card p { color: var(--mdy-muted); }
.summary-card textarea { width: 100%; min-height: 250px; padding: 14px; border: 1px solid var(--mdy-line); border-radius: 8px; background: var(--mdy-soft); resize: vertical; }
.contact-list { padding: 0; margin: 22px 0 0; list-style: none; }
.contact-list li { padding: 7px 0; border-bottom: 1px solid #edf1f6; }
.contact-list a { color: var(--mdy-blue); text-decoration: none; }

.faq-list { display: grid; gap: 12px; }
.faq-item { border: 1px solid var(--mdy-line); border-radius: 10px; background: #fff; }
.faq-item summary { padding: 18px 20px; cursor: pointer; font-weight: 800; }
.faq-item p { margin: 0; padding: 0 20px 20px; color: var(--mdy-muted); }

.site-footer { padding: 34px 44px; background: #0d223f; color: rgba(255,255,255,.76); }
.footer-inner { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 18px; }
.footer-inner strong { color: #fff; }
.footer-inner a { color: inherit; text-decoration: none; }

@media (max-width: 960px) {
  .site-nav { display: none; }
  .hero-grid, .inquiry-layout { grid-template-columns: 1fr; }
  .card-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .steps { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .summary-card { position: static; }
}

@media (max-width: 640px) {
  body { font-size: 15px; }
  .site-header { height: 60px; padding: 0 16px; }
  .brand span:last-child { display: none; }
  .header-cta { min-height: 40px; padding: 0 12px; }
  .hero { padding: 52px 18px 44px; }
  .hero-grid { gap: 30px; }
  .hero-copy { font-size: 16px; }
  .hero-panel { padding: 20px; }
  .quick-inner { padding: 16px 18px; }
  .section { padding: 56px 18px; }
  .card-grid, .product-grid, .steps, .form-grid { grid-template-columns: 1fr; }
  .field.full { grid-column: auto; }
  .comparison { display: block; overflow-x: auto; white-space: normal; }
  .comparison th, .comparison td { min-width: 145px; padding: 14px; }
  .diagram-frame { padding: 10px; overflow-x: auto; }
  .diagram-frame img { min-width: 680px; }
  .diagram-intro { margin-bottom: 18px; padding: 15px 16px; }
  .diagram-guide { grid-template-columns: 1fr; gap: 10px; }
  .diagram-guide-item { padding: 16px; }
  .diagram-guide-item::after { content: "↓"; top: auto; right: 50%; bottom: -17px; transform: translateX(50%); }
  .inquiry-form, .summary-card { padding: 20px; }
  .site-footer { padding: 30px 18px; }
}