/* アプリ (ios/Kokanko/Sources/Views/Theme.swift) と同じ地色と差し色 */
:root {
  --bg: #002a3b;
  --surface: #0b2d34;
  --edge: rgba(255, 255, 255, 0.12);
  --accent: #0dcbd5;
  --accent-bright: #7ef0f0;
  --text: #ffffff;
  --text-2: rgba(255, 255, 255, 0.72);
  --text-3: rgba(255, 255, 255, 0.5);
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: radial-gradient(120% 80% at 50% 0%, #0a6b72 0%, var(--bg) 60%) no-repeat, var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic UI", Meiryo, sans-serif;
  line-height: 1.8;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
a { color: var(--accent-bright); }
main { flex: 1; width: 100%; max-width: 760px; margin: 0 auto; padding: 0 20px 64px; }

.site-header { width: 100%; max-width: 960px; margin: 0 auto; padding: 20px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-weight: 700; font-size: 20px; }
.brand img { width: 36px; height: 36px; border-radius: 9px; }

.hero { text-align: center; padding: 48px 0 32px; }
.hero .app-icon { width: 112px; height: 112px; border-radius: 26px; box-shadow: 0 12px 40px rgba(13, 203, 213, 0.25); }
.hero h1 { font-size: clamp(28px, 7vw, 44px); line-height: 1.35; margin: 28px 0 16px; letter-spacing: 0.02em; }
.hero p { color: var(--text-2); margin: 0 auto; max-width: 34em; }
.badge { display: inline-block; margin-top: 28px; padding: 10px 22px; border-radius: 999px; border: 1px solid var(--edge); background: rgba(255, 255, 255, 0.06); color: var(--accent-bright); font-weight: 600; }

.section-title { font-size: 22px; margin: 56px 0 20px; text-align: center; }
.cards { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); }
.card { background: rgba(255, 255, 255, 0.05); border: 1px solid var(--edge); border-radius: 20px; padding: 22px; }
.card h3 { margin: 0 0 8px; font-size: 17px; }
.card p { margin: 0; color: var(--text-2); font-size: 15px; }
.step-no { color: var(--accent); font-weight: 700; font-size: 13px; letter-spacing: 0.08em; }

.doc h1 { font-size: 28px; margin: 32px 0 8px; }
.doc .meta { color: var(--text-3); font-size: 14px; margin: 0 0 32px; }
.doc h2 { font-size: 19px; margin: 36px 0 10px; padding-top: 12px; border-top: 1px solid var(--edge); }
.doc p, .doc li { color: var(--text-2); }
.doc dl { display: grid; grid-template-columns: max-content 1fr; gap: 6px 20px; color: var(--text-2); }
.doc dt { color: var(--text); }
.doc dd { margin: 0; }
.notice { background: rgba(255, 255, 255, 0.06); border: 1px solid var(--edge); border-radius: 16px; padding: 16px 20px; color: var(--text-2); }

.site-footer { border-top: 1px solid var(--edge); padding: 28px 20px 40px; text-align: center; font-size: 14px; color: var(--text-3); }
.site-footer nav { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px 24px; margin-bottom: 12px; }
.site-footer nav a { color: var(--text-2); text-decoration: none; }
.site-footer nav a:hover { color: var(--text); }