:root {
  color-scheme: light;
  --blue: #1677ff;
  --blue-dark: #0958d9;
  --cyan: #08c6d4;
  --ink: #14213d;
  --muted: #61708a;
  --line: #dfe8f5;
  --soft: #f3f8ff;
  --surface: #ffffff;
  --shadow: 0 18px 50px rgba(22, 63, 125, 0.12);
  font-family: Inter, "Noto Sans JP", "Hiragino Kaku Gothic ProN", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--surface); line-height: 1.75; }
a { color: inherit; }
img { max-width: 100%; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(223, 232, 245, 0.9);
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(14px);
}
.nav { max-width: 1120px; margin: auto; min-height: 68px; padding: 0 24px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; font-size: 20px; font-weight: 800; }
.brand img { width: 34px; height: 34px; }
.nav-links { display: flex; gap: 22px; font-size: 14px; font-weight: 650; }
.nav-links a { text-decoration: none; color: #52627b; }
.nav-links a:hover, .nav-links a:focus-visible { color: var(--blue); }

main { overflow: hidden; }
.section { max-width: 1120px; margin: auto; padding: 92px 24px; }
.hero { position: relative; display: grid; grid-template-columns: 1.08fr 0.92fr; gap: 68px; align-items: center; min-height: 650px; }
.hero::before { content: ""; position: absolute; inset: 40px -260px auto 55%; height: 480px; border-radius: 50%; background: radial-gradient(circle, rgba(8,198,212,.18), rgba(22,119,255,.06) 55%, transparent 72%); pointer-events: none; }
.eyebrow { margin: 0 0 12px; color: var(--blue); font-size: 13px; font-weight: 800; letter-spacing: .16em; }
h1 { margin: 0; font-size: clamp(44px, 7vw, 78px); line-height: 1.08; letter-spacing: -.045em; }
.lead { margin: 24px 0 0; max-width: 620px; font-size: clamp(18px, 2vw, 22px); color: #43516a; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.button { display: inline-flex; min-height: 48px; padding: 10px 22px; align-items: center; justify-content: center; border: 1px solid var(--blue); border-radius: 10px; background: var(--blue); color: white; font-weight: 750; text-decoration: none; }
.button:hover, .button:focus-visible { background: var(--blue-dark); border-color: var(--blue-dark); }
.button.secondary { background: white; color: var(--blue); }
.button.secondary:hover, .button.secondary:focus-visible { background: var(--soft); }
.availability { margin-top: 14px; font-size: 13px; color: var(--muted); }

.product-card { position: relative; padding: 20px; border: 1px solid var(--line); border-radius: 24px; background: rgba(255,255,255,.9); box-shadow: var(--shadow); }
.product-head { display: flex; align-items: center; gap: 12px; padding-bottom: 16px; border-bottom: 1px solid var(--line); }
.product-head img { width: 42px; height: 42px; }
.product-head strong { display: block; font-size: 20px; }
.product-head span { color: var(--muted); font-size: 13px; }
.mock-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin: 18px 0; }
.mock-actions span { padding: 8px; border: 1px solid #cbd9eb; border-radius: 8px; text-align: center; font-size: 13px; }
.mock-actions span:first-child { border-color: var(--blue); background: var(--blue); color: white; }
.mock-folder { margin-top: 12px; font-weight: 750; }
.mock-row { margin-top: 7px; padding: 9px 11px; border: 1px solid #dce5ef; border-radius: 7px; background: #f8fbff; font-size: 14px; }
.mock-row.active { border-color: #a9d0ff; background: #eaf4ff; color: #0b62c7; }

.tinted { background: linear-gradient(180deg, #f7fbff, #ffffff); }
.section-title { margin: 0; font-size: clamp(30px, 4vw, 46px); line-height: 1.25; letter-spacing: -.025em; }
.section-intro { max-width: 720px; margin: 14px 0 0; color: var(--muted); }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 42px; }
.feature, .trust-card { padding: 26px; border: 1px solid var(--line); border-radius: 16px; background: white; }
.feature .icon { display: grid; place-items: center; width: 40px; height: 40px; border-radius: 11px; background: var(--soft); color: var(--blue); font-weight: 900; }
.feature h3, .trust-card h3 { margin: 18px 0 8px; font-size: 18px; }
.feature p, .trust-card p { margin: 0; color: var(--muted); font-size: 14px; }

.pricing { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; margin-top: 42px; align-items: stretch; }
.plan { position: relative; padding: 30px; border: 1px solid var(--line); border-radius: 20px; background: white; }
.plan.pro { border: 2px solid var(--blue); box-shadow: var(--shadow); }
.badge { display: inline-block; padding: 3px 9px; border-radius: 999px; background: #eaf4ff; color: var(--blue-dark); font-size: 12px; font-weight: 800; }
.plan h3 { margin: 14px 0 0; font-size: 25px; }
.price { margin: 8px 0 18px; font-size: 34px; font-weight: 850; }
.price small { font-size: 13px; font-weight: 600; color: var(--muted); }
.plan ul { margin: 0; padding: 0; list-style: none; }
.plan li { padding: 9px 0; border-bottom: 1px solid #edf2f8; font-size: 14px; }
.plan li::before { content: "✓"; margin-right: 8px; color: var(--blue); font-weight: 900; }
.payment-note { margin: 24px 0 0; color: var(--muted); font-size: 13px; }

.trust-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 34px; }
.trust-card h3 { margin-top: 0; }
.cta { text-align: center; padding: 70px 24px; border-radius: 28px; color: white; background: linear-gradient(135deg, #075fc3, #1677ff 52%, #08b9ca); }
.cta .section-title { color: white; }
.cta p { margin: 14px auto 24px; max-width: 650px; color: rgba(255,255,255,.84); }

.page-hero { padding-top: 72px; padding-bottom: 46px; }
.page-hero h1 { font-size: clamp(38px, 6vw, 62px); }
.prose { max-width: 820px; }
.prose section { padding: 26px 0; border-top: 1px solid var(--line); }
.prose h2 { margin: 0 0 10px; font-size: 22px; }
.prose p, .prose li, .prose dd { color: #46546b; }
.prose ul { padding-left: 1.25em; }
.legal-list { margin: 0; }
.legal-list div { display: grid; grid-template-columns: 180px 1fr; gap: 18px; padding: 13px 0; border-bottom: 1px solid var(--line); }
.legal-list dt { font-weight: 750; }
.legal-list dd { margin: 0; }
.notice { padding: 18px 20px; border-left: 4px solid var(--blue); border-radius: 8px; background: var(--soft); color: #364760; }

footer { border-top: 1px solid var(--line); background: #f8fbff; }
.footer-inner { max-width: 1120px; margin: auto; padding: 36px 24px; display: flex; justify-content: space-between; gap: 24px; color: var(--muted); font-size: 13px; }
.footer-links { display: flex; flex-wrap: wrap; gap: 18px; }
.footer-links a { text-decoration: none; }

@media (max-width: 780px) {
  .nav { padding: 0 18px; }
  .nav-links a:not(:last-child) { display: none; }
  .section { padding: 68px 20px; }
  .hero { grid-template-columns: 1fr; gap: 38px; min-height: auto; }
  .feature-grid, .trust-grid, .pricing { grid-template-columns: 1fr; }
  .product-card { max-width: 500px; }
  .legal-list div { grid-template-columns: 1fr; gap: 3px; }
  .footer-inner { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}