:root {
  color-scheme: light;
  --ink: #10233d;
  --muted: #5f6f85;
  --ocean: #075c9d;
  --blue: #0e86d4;
  --sky: #eaf6ff;
  --line: #dce8f0;
  --paper: #ffffff;
  --safe: #35a86b;
  --warning: #ec9e2e;
  --danger: #d6564d;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", "Noto Sans JP", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: #f7fafc; color: var(--ink); line-height: 1.7; }
a { color: inherit; text-decoration: none; }
.wrap { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }
.site-header { position: sticky; top: 0; z-index: 10; border-bottom: 1px solid rgba(220, 232, 240, .75); background: rgba(255, 255, 255, .92); backdrop-filter: blur(14px); }
.nav { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: flex; align-items: center; gap: 11px; font-size: 18px; font-weight: 800; letter-spacing: -.03em; }
.brand img { width: 34px; height: 34px; border-radius: 10px; }
.nav-links { display: flex; align-items: center; gap: 20px; color: var(--muted); font-size: 14px; font-weight: 650; }
.nav-links a:hover { color: var(--ocean); }
.app-link { display: inline-flex; align-items: center; justify-content: center; min-height: 43px; padding: 0 18px; border-radius: 999px; background: var(--ocean); color: #fff; font-size: 14px; font-weight: 750; transition: transform .2s, background .2s; }
.app-link:hover { background: #034c83; transform: translateY(-1px); }
.hero { overflow: hidden; background: linear-gradient(135deg, #eef9ff 0%, #f8fcff 52%, #f0f8f5 100%); padding: 88px 0 74px; }
.hero-grid { display: grid; grid-template-columns: 1.08fr .92fr; align-items: center; gap: 70px; }
.eyebrow { margin: 0 0 16px; color: var(--ocean); font-size: 13px; font-weight: 800; letter-spacing: .12em; }
h1, h2, h3 { margin: 0; line-height: 1.25; letter-spacing: -.045em; }
h1 { font-size: clamp(42px, 6vw, 72px); max-width: 680px; }
.hero-copy { margin: 24px 0 30px; max-width: 590px; color: var(--muted); font-size: 18px; }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 13px; }
.hero-badge { display: block; width: 145px; }
.hero-note { color: var(--muted); font-size: 13px; }
.signal-card { position: relative; min-height: 395px; border: 1px solid rgba(136, 189, 222, .55); border-radius: 28px; padding: 26px; background: rgba(255, 255, 255, .78); box-shadow: 0 28px 70px rgba(11, 77, 123, .14); }
.signal-top { display: flex; justify-content: space-between; color: var(--muted); font-size: 13px; font-weight: 700; }
.signal-dot { width: 10px; height: 10px; display: inline-block; margin-right: 7px; border-radius: 50%; background: var(--safe); box-shadow: 0 0 0 5px rgba(53,168,107,.12); }
.reading { margin: 52px 0 4px; color: var(--ocean); font-size: 67px; font-weight: 800; line-height: 1; letter-spacing: -.08em; }
.unit { color: var(--muted); font-size: 16px; font-weight: 700; }
.gauge { position: absolute; right: -20px; bottom: 42px; width: min(88%, 360px); padding: 20px; border: 1px solid var(--line); border-radius: 19px; background: var(--paper); box-shadow: 0 18px 40px rgba(10, 54, 89, .13); }
.gauge-label { display: flex; justify-content: space-between; margin-bottom: 13px; color: var(--muted); font-size: 12px; font-weight: 700; }
.gauge-bars { display: grid; grid-template-columns: repeat(24, 1fr); gap: 4px; align-items: end; height: 56px; }
.gauge-bars span { display: block; border-radius: 4px; background: #9fd9c0; }
.gauge-bars span:nth-child(3n) { height: 68%; }.gauge-bars span:nth-child(4n) { height: 90%; }.gauge-bars span:nth-child(5n) { height: 54%; }.gauge-bars span:nth-child(2n) { height: 76%; }
.section { padding: 96px 0; }
.section-alt { background: var(--paper); }
.section-head { display: grid; grid-template-columns: .7fr 1.3fr; gap: 50px; margin-bottom: 42px; }
.section h2 { font-size: clamp(31px, 4vw, 48px); }
.section-copy { margin: 6px 0 0; color: var(--muted); font-size: 17px; }
.feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.feature { min-height: 250px; padding: 26px; border: 1px solid var(--line); border-radius: 20px; background: #fbfdff; }
.feature-mark { display: flex; align-items: center; justify-content: center; width: 46px; height: 46px; margin-bottom: 48px; border-radius: 14px; background: var(--sky); color: var(--ocean); font-size: 22px; font-weight: 800; }
.feature h3 { margin-bottom: 9px; font-size: 20px; }
.feature p { margin: 0; color: var(--muted); font-size: 14px; }
.how-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.how { position: relative; padding-top: 54px; border-top: 2px solid #b8dcec; }
.how span { position: absolute; top: 15px; color: var(--ocean); font-size: 13px; font-weight: 800; letter-spacing: .1em; }
.how h3 { margin-bottom: 10px; font-size: 22px; }
.how p { margin: 0; color: var(--muted); }
.download { padding: 76px 0; background: var(--ink); color: #fff; }
.download-box { display: flex; align-items: center; justify-content: space-between; gap: 40px; }
.download h2 { max-width: 610px; font-size: clamp(30px, 4vw, 48px); }
.download p { color: #bdd0df; }
.download-side { display: flex; align-items: center; gap: 18px; flex-shrink: 0; }
.qr { width: 116px; padding: 7px; border-radius: 12px; background: white; }
.site-footer { padding: 34px 0; background: #0b192b; color: #a9bac8; font-size: 13px; }
.footer-inner { display: flex; justify-content: space-between; align-items: center; gap: 20px; }
.footer-links { display: flex; gap: 18px; }
.footer-links a:hover { color: #fff; }
.legal-page { padding: 74px 0 100px; }
.legal-card { max-width: 840px; margin: 0 auto; padding: clamp(28px, 6vw, 68px); border: 1px solid var(--line); border-radius: 24px; background: var(--paper); }
.legal-card h1 { margin-bottom: 12px; font-size: clamp(36px, 5vw, 58px); }
.legal-card h2 { margin: 42px 0 12px; font-size: 22px; }
.legal-card p, .legal-card li { color: #43546a; }
.legal-card ul { padding-left: 1.3em; }
.updated { margin: 0; color: var(--muted); font-size: 14px; }
.breadcrumb { display: inline-flex; margin-bottom: 32px; color: var(--ocean); font-size: 14px; font-weight: 700; }
@media (max-width: 820px) { .nav-links { display: none; }.hero { padding: 58px 0 62px; }.hero-grid, .section-head { grid-template-columns: 1fr; gap: 38px; }.signal-card { min-height: 340px; }.feature-grid { grid-template-columns: repeat(2, 1fr); }.how-grid { grid-template-columns: 1fr; }.download-box { align-items: flex-start; flex-direction: column; }.footer-inner { align-items: flex-start; flex-direction: column; } }
@media (max-width: 500px) { .wrap { width: min(100% - 28px, 1120px); }.feature-grid { grid-template-columns: 1fr; }.hero-copy { font-size: 16px; }.reading { font-size: 56px; }.gauge { right: -7px; }.download-side { align-items: flex-start; flex-direction: column; } }