:root {
  --bg: #f7f8fb;
  --surface: #ffffff;
  --surface-2: #f2f4f8;
  --text: #151821;
  --muted: #5d6475;
  --line: #e3e7ef;
  --accent: #111827;
  --accent-2: #384152;
  --max: 1120px;
  --radius: 24px;
  --shadow: 0 14px 40px rgba(17, 24, 39, 0.08);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.container {
  width: min(calc(100% - 32px), var(--max));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(12px);
  background: rgba(247, 248, 251, 0.86);
  border-bottom: 1px solid rgba(227, 231, 239, 0.9);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 72px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  letter-spacing: .02em;
}

.brand-mark {
  width: 40px;
  height: 40px;
  border-radius: 14px;
  background: linear-gradient(135deg, #111827 0%, #475569 100%);
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 14px;
  font-weight: 900;
}

.brand-copy small,
.footer-brand small {
  display: block;
  color: var(--muted);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .04em;
}

.main-nav {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.main-nav a {
  padding: 10px 14px;
  border-radius: 999px;
  color: var(--muted);
  font-weight: 700;
  font-size: 14px;
}

.main-nav a:hover,
.main-nav a:focus-visible {
  background: var(--surface);
  color: var(--text);
}

.hero {
  padding: 48px 0 28px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr .8fr;
  gap: 22px;
}

.hero-card,
.panel,
.card,
.legal-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.hero-card {
  padding: 34px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 800;
  color: var(--accent-2);
  text-transform: uppercase;
  letter-spacing: .08em;
  background: var(--surface-2);
  padding: 8px 12px;
  border-radius: 999px;
}

.hero h1 {
  margin: 18px 0 12px;
  font-size: clamp(32px, 5vw, 56px);
  line-height: 1.05;
  letter-spacing: -.03em;
}

.hero p {
  margin: 0;
  color: var(--muted);
  font-size: 16px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  padding: 0 18px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 800;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
}

.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--accent); color: #fff; }
.btn-secondary { background: var(--surface-2); color: var(--text); }

.hero-side {
  display: grid;
  gap: 18px;
}

.mini-panel {
  padding: 24px;
}

.mini-panel h2,
.section-heading h2 {
  margin: 0 0 8px;
  font-size: 24px;
  letter-spacing: -.02em;
}

.mini-panel p,
.section-heading p,
.card p,
.panel p {
  margin: 0;
  color: var(--muted);
}

.badge-list,
.link-list,
.info-list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
}

.badge-list li,
.link-list li,
.info-list li {
  padding: 11px 0;
  border-top: 1px solid var(--line);
}

.badge-list li:first-child,
.link-list li:first-child,
.info-list li:first-child { border-top: 0; }

.sections {
  padding: 16px 0 56px;
}

.section-block { margin-top: 28px; }
.section-block:first-child { margin-top: 0; }

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 14px;
}

.cards-3,
.cards-2 {
  display: grid;
  gap: 18px;
}
.cards-3 { grid-template-columns: repeat(3, 1fr); }
.cards-2 { grid-template-columns: repeat(2, 1fr); }

.card,
.panel {
  padding: 24px;
}

.card h3,
.panel h3,
.legal-card h1,
.legal-card h2,
.legal-card h3 {
  margin: 0 0 8px;
  letter-spacing: -.02em;
}

.card h3 { font-size: 20px; }

.app-mock {
  background: linear-gradient(180deg, #121826 0%, #202737 100%);
  color: #fff;
  min-height: 100%;
}

.app-screen {
  display: grid;
  gap: 14px;
  margin-top: 20px;
}

.app-bar,
.app-item,
.app-grid-item {
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.08);
}

.app-bar {
  height: 48px;
  border-radius: 16px;
}

.app-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.app-item {
  min-height: 82px;
  border-radius: 18px;
}

.app-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.app-grid-item {
  padding-top: 130%;
  border-radius: 16px;
}

.legal-hero {
  padding: 42px 0 24px;
}

.legal-card {
  padding: 34px;
}

.legal-card h1 {
  font-size: clamp(30px, 4vw, 42px);
  margin-bottom: 10px;
}

.legal-meta {
  color: var(--muted);
  font-size: 14px;
  margin-bottom: 24px;
}

.legal-card section {
  margin-top: 28px;
}

.legal-card ul {
  margin: 10px 0 0;
  padding-left: 1.2em;
}

.legal-card li + li { margin-top: 6px; }

.cta-box {
  margin-top: 24px;
  padding: 18px;
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: 18px;
}

.site-footer {
  border-top: 1px solid var(--line);
  background: #fff;
}

.footer-inner {
  padding: 28px 0 40px;
  display: flex;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.footer-brand {
  display: flex;
  gap: 12px;
  align-items: center;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 14px;
  align-items: center;
}

.footer-links a {
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.notice {
  font-size: 13px;
  color: var(--muted);
}

@media (max-width: 920px) {
  .hero-grid,
  .cards-3,
  .cards-2 { grid-template-columns: 1fr; }
  .hero-card,
  .mini-panel,
  .card,
  .panel,
  .legal-card { padding: 22px; }
}

@media (max-width: 640px) {
  .header-inner { min-height: 64px; }
  .main-nav { display: none; }
  .hero { padding-top: 28px; }
  .hero-actions { flex-direction: column; }
  .btn { width: 100%; }
  .app-grid { gap: 8px; }
  .footer-inner { padding-top: 22px; }
}