:root {
  color-scheme: light;
  --background: #f7f8fb;
  --surface: #ffffff;
  --text: #172033;
  --muted: #5b667a;
  --border: #dbe2ec;
  --primary: #0f766e;
  --primary-strong: #115e59;
  --soft-primary: #e6f4f2;
  --shadow: 0 12px 32px rgba(23, 32, 51, 0.08);
}

* { box-sizing: border-box; }

html {
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
}

body { background: var(--background); color: var(--text); margin: 0; }

a { color: var(--primary); }
a:hover { color: var(--primary-strong); }

.site-header, .site-footer, main { margin: 0 auto; max-width: 880px; padding-left: 20px; padding-right: 20px; }
.site-header { align-items: center; display: flex; gap: 20px; justify-content: space-between; padding-bottom: 24px; padding-top: 24px; }
.brand { color: var(--text); font-size: 1.05rem; font-weight: 800; text-decoration: none; }
.nav { display: flex; flex-wrap: wrap; gap: 14px; }
.nav a { color: var(--muted); font-size: 0.92rem; font-weight: 700; text-decoration: none; }
.nav a:hover { color: var(--primary-strong); text-decoration: underline; }
main { padding-bottom: 56px; }
.hero, .card { background: var(--surface); border: 1px solid var(--border); border-radius: 18px; box-shadow: var(--shadow); }
.hero { padding: clamp(28px, 6vw, 48px); }
.card { margin-top: 18px; padding: clamp(22px, 4vw, 32px); }
.eyebrow { color: var(--primary); font-size: 0.78rem; font-weight: 800; letter-spacing: 0.08em; text-transform: uppercase; }
h1, h2, h3 { line-height: 1.25; margin: 0; }
h1 { font-size: clamp(2rem, 6vw, 3.4rem); letter-spacing: -0.04em; margin-top: 8px; }
h2 { font-size: 1.35rem; }
h3 { font-size: 1.05rem; margin-top: 22px; }
p, li, .meta { color: var(--muted); }
p { margin: 12px 0 0; }
ul { margin: 12px 0 0; padding-left: 1.35rem; }
li + li { margin-top: 6px; }
.app-list { display: grid; gap: 14px; margin-top: 18px; }
.app-card { border: 1px solid var(--border); border-radius: 14px; padding: 20px; }
.app-card h3 { margin-top: 0; }
.link-list { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 18px; }
.button { background: var(--primary); border-radius: 999px; color: #fff; display: inline-block; font-weight: 800; padding: 10px 16px; text-decoration: none; }
.button:hover { background: var(--primary-strong); color: #fff; text-decoration: none; }
.button.secondary { background: var(--soft-primary); color: var(--primary-strong); }
.button.secondary:hover { color: var(--primary-strong); }
.notice { background: #fffbeb; border: 1px solid #fde68a; border-radius: 12px; color: #6b4e00; margin-top: 18px; padding: 14px 16px; }
.notice p { color: inherit; margin: 0; }
.site-footer { border-top: 1px solid var(--border); color: var(--muted); font-size: 0.85rem; padding-bottom: 28px; padding-top: 28px; }

@media (max-width: 620px) {
  .site-header { align-items: flex-start; flex-direction: column; }
  .hero, .card { border-radius: 14px; }
}