/* 暗記マーカー - ランディングページ */
* { box-sizing: border-box; }
:root {
  --bg: #0f172a;
  --bg-2: #1e293b;
  --fg: #f1f5f9;
  --muted: #94a3b8;
  --accent: #fbbf24;
  --accent-2: #f59e0b;
  --card: #1e293b;
  --border: #334155;
  --link: #60a5fa;
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bot: env(safe-area-inset-bottom, 0px);
  --safe-left: env(safe-area-inset-left, 0px);
  --safe-right: env(safe-area-inset-right, 0px);
}
@media (prefers-color-scheme: light) {
  :root {
    --bg: #f8fafc;
    --bg-2: #ffffff;
    --fg: #0f172a;
    --muted: #475569;
    --card: #ffffff;
    --border: #e2e8f0;
    --link: #2563eb;
  }
}
html, body { margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN",
               "Hiragino Sans", "Yu Gothic UI", "Meiryo", system-ui, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.7;
  -webkit-tap-highlight-color: transparent;
  /* iPhone のノッチ・ホームバーを避けるための余白 */
  padding-left: var(--safe-left);
  padding-right: var(--safe-right);
  min-height: 100vh;
  min-height: 100dvh;
}
.hero {
  background: linear-gradient(135deg, #0f172a 0%, #1e3a8a 60%, #f59e0b 140%);
  color: #fff;
  /* 上はノッチ分プラス */
  padding: calc(3rem + var(--safe-top)) 1.25rem 3rem;
  text-align: center;
  /* body の左右パディングを打ち消し、ヒーロー背景を端まで伸ばす */
  margin-left: calc(-1 * var(--safe-left));
  margin-right: calc(-1 * var(--safe-right));
  padding-left: calc(1.25rem + var(--safe-left));
  padding-right: calc(1.25rem + var(--safe-right));
}
.hero h1 { font-size: clamp(1.8rem, 6vw, 3rem); margin: 0 0 .5rem; }
.lead { font-size: clamp(1rem, 3.5vw, 1.25rem); opacity: .92; margin: 0 0 2rem; }
.cta { display: flex; gap: .75rem; justify-content: center; flex-wrap: wrap; margin-bottom: 1.25rem; }
.btn-primary, .btn-secondary {
  display: inline-block; padding: .85rem 1.4rem; border-radius: 999px;
  font-weight: 700; text-decoration: none; transition: transform .1s ease;
}
.btn-primary { background: var(--accent); color: #1f2937; }
.btn-primary:hover { background: var(--accent-2); }
.btn-secondary { background: rgba(255,255,255,.15); color: #fff; border: 1px solid rgba(255,255,255,.4); }
.btn-secondary:hover { background: rgba(255,255,255,.25); }
.btn-primary:active, .btn-secondary:active { transform: scale(.97); }
.badge {
  display: inline-block; font-size: .85rem; padding: .25rem .8rem;
  background: rgba(255,255,255,.15); border-radius: 999px;
}
main { max-width: 920px; margin: 0 auto; padding: 2rem 1.25rem 3rem; }
section { margin: 3rem 0; }
section h2 {
  font-size: 1.6rem; border-bottom: 3px solid var(--accent);
  padding-bottom: .35rem; margin-bottom: 1.25rem; display: inline-block;
}
.feature-grid {
  list-style: none; padding: 0; margin: 0;
  display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 1rem;
}
.feature-grid li {
  background: var(--card); border: 1px solid var(--border); border-radius: 14px;
  padding: 1.1rem; text-align: center;
}
.feature-grid span { font-size: 2rem; display: block; margin-bottom: .35rem; }
.feature-grid h3 { font-size: 1rem; margin: .15rem 0 .3rem; }
.feature-grid p { font-size: .87rem; color: var(--muted); margin: 0; }
.steps { padding-left: 1.25rem; }
.steps li { margin-bottom: .65rem; }
.install-card {
  background: var(--card); border: 1px solid var(--border); border-radius: 14px;
  padding: 1.25rem 1.5rem; margin-bottom: 1rem;
}
.install-card h3 { margin-top: 0; }
.install-card ol { padding-left: 1.25rem; }
.install-card li { margin-bottom: .35rem; }
.note { font-size: .85rem; color: var(--muted); margin: .5rem 0 0; }
.tips ul { padding-left: 1.25rem; }
.tips li { margin-bottom: .5rem; color: var(--muted); }
footer {
  text-align: center;
  padding: 2rem 1rem calc(2rem + var(--safe-bot));
  color: var(--muted); border-top: 1px solid var(--border);
  font-size: .9rem;
}
footer a { color: var(--link); }
@media (max-width: 480px) {
  .hero {
    padding: calc(2rem + var(--safe-top)) 1rem 2rem;
    padding-left: calc(1rem + var(--safe-left));
    padding-right: calc(1rem + var(--safe-right));
  }
  main { padding: 1rem; }
}