:root {
  --ink: #18202b;
  --muted: #5d6878;
  --blue: #0875d1;
  --blue-soft: #eaf5ff;
  --line: #e5eaf0;
  --surface: #fff;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background: #f8fafc;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", Meiryo, sans-serif;
  -webkit-font-smoothing: antialiased;
}

.site-header {
  height: 76px;
  background: rgba(255,255,255,.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}
.header-inner, main, footer { width: min(1080px, calc(100% - 40px)); margin: 0 auto; }
.header-inner { height: 100%; display: flex; align-items: center; justify-content: space-between; }
.brand { display: inline-flex; align-items: center; gap: 11px; color: var(--ink); text-decoration: none; font-weight: 800; font-size: 20px; }
.brand-mark { width: 38px; height: 38px; border-radius: 11px; display: grid; place-items: center; background: var(--blue); }
.brand-mark svg { width: 24px; height: 24px; fill: white; }
.brand-mark .mark-cut { fill: var(--blue); }
.header-label { color: #8993a1; font-size: 11px; font-weight: 700; letter-spacing: .16em; }

.hero { min-height: 470px; display: grid; grid-template-columns: 1.15fr .85fr; gap: 64px; align-items: center; padding: 72px 0 64px; }
.eyebrow { margin: 0 0 18px; color: var(--blue); font-size: 12px; font-weight: 800; letter-spacing: .2em; }
.hero h1 { margin: 0; font-size: clamp(40px, 5.5vw, 67px); line-height: 1.2; letter-spacing: -.04em; }
.hero h1 span { color: var(--blue); }
.lead { max-width: 620px; margin: 26px 0 0; color: var(--muted); font-size: 16px; line-height: 2; }
.hero-visual { position: relative; min-height: 310px; display: grid; place-items: center; }
.hero-visual::before { content: ""; position: absolute; width: 330px; height: 330px; border-radius: 50%; background: linear-gradient(135deg, #dff1ff, #f4f9fd); }
.hero-visual::after { content: ""; position: absolute; width: 230px; height: 230px; border: 1px solid rgba(8,117,209,.15); border-radius: 50%; }
.payment-card { position: relative; z-index: 1; width: 280px; min-height: 180px; padding: 30px; border-radius: 22px; color: white; background: linear-gradient(145deg, #1185df, #075da8); box-shadow: 0 24px 55px rgba(8,92,164,.28); transform: rotate(-4deg); display: flex; flex-direction: column; justify-content: flex-end; }
.payment-card svg { position: absolute; top: 24px; right: 26px; width: 45px; height: 45px; stroke: white; stroke-width: 1.7; }
.card-chip { position: absolute; top: 34px; left: 30px; width: 40px; height: 28px; border-radius: 7px; background: linear-gradient(135deg, #ffe6a3, #d8ad42); }
.payment-card strong { font-size: 18px; letter-spacing: .01em; }
.payment-card small { margin-top: 6px; color: rgba(255,255,255,.78); font-size: 11px; }

.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; padding-bottom: 64px; }
.features article { min-height: 200px; padding: 27px; background: var(--surface); border: 1px solid var(--line); border-radius: 16px; }
.feature-number { color: var(--blue); font-size: 12px; font-weight: 800; letter-spacing: .12em; }
.features h2 { margin: 20px 0 12px; font-size: 19px; }
.features p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.85; }

.notice { display: grid; grid-template-columns: auto 1fr; gap: 18px; align-items: start; margin-bottom: 72px; padding: 25px 28px; border-radius: 14px; background: var(--blue-soft); border: 1px solid #cfe8fb; }
.notice-icon { width: 27px; height: 27px; border-radius: 50%; display: grid; place-items: center; color: white; background: var(--blue); font: 700 15px Georgia, serif; }
.notice h2 { margin: 1px 0 8px; font-size: 16px; }
.notice p { margin: 0; color: #4c5b6d; font-size: 13px; line-height: 1.8; }

footer { min-height: 90px; padding: 26px 0; border-top: 1px solid var(--line); display: flex; justify-content: space-between; align-items: center; gap: 20px; }
footer span { font-weight: 800; }
footer small { color: #8993a1; }

@media (max-width: 760px) {
  .header-inner, main, footer { width: min(100% - 28px, 620px); }
  .site-header { height: 66px; }
  .header-label { display: none; }
  .hero { min-height: 0; grid-template-columns: 1fr; gap: 34px; padding: 52px 0 44px; }
  .hero h1 { font-size: clamp(37px, 11vw, 52px); }
  .lead { font-size: 14px; line-height: 1.9; }
  .hero-visual { min-height: 250px; }
  .hero-visual::before { width: 265px; height: 265px; }
  .hero-visual::after { width: 190px; height: 190px; }
  .payment-card { width: 245px; min-height: 158px; padding: 25px; }
  .features { grid-template-columns: 1fr; gap: 12px; padding-bottom: 44px; }
  .features article { min-height: 0; padding: 23px; }
  .features h2 { margin: 14px 0 8px; }
  .notice { margin-bottom: 48px; padding: 21px; }
  footer { min-height: 110px; flex-direction: column; justify-content: center; align-items: flex-start; }
}