:root {
  /* Best Buy 系: ディープネイビー背景 + イエローアクセント */
  --bg: #04070f;
  --bg-grad-top: #0e1b3d;
  --surface: #16213e;
  --surface-elevated: #1f2e52;
  --accent: #ffe000;
  --accent-dim: rgba(255, 224, 0, 0.14);
  --text: #f5f5f7;
  --text-muted: rgba(255, 255, 255, 0.6);
  --border: rgba(255, 255, 255, 0.08);
  --radius: 14px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
  background: linear-gradient(180deg, var(--bg-grad-top), var(--bg) 40%);
  background-attachment: fixed;
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: 960px; margin: 0 auto; padding: 0 20px; }

/* header */
header.site {
  position: sticky; top: 0; z-index: 10;
  backdrop-filter: blur(12px);
  background: rgba(4, 7, 15, 0.7);
  border-bottom: 1px solid var(--border);
}
header.site .wrap {
  display: flex; align-items: center; justify-content: space-between;
  padding-top: 14px; padding-bottom: 14px;
}
.logo { font-weight: 800; font-size: 1.15rem; letter-spacing: 0.02em; }
.logo span { color: var(--accent); }
header.site nav a {
  color: var(--text-muted); text-decoration: none; font-size: 0.9rem; margin-left: 20px;
}
header.site nav a:hover { color: var(--text); }

/* hero */
.hero { padding: 84px 0 64px; text-align: center; }
.badge {
  display: inline-block; font-size: 0.8rem; color: var(--accent);
  background: var(--accent-dim); border: 1px solid rgba(255, 224, 0, 0.35);
  border-radius: 999px; padding: 4px 14px; margin-bottom: 24px;
}
.hero h1 { font-size: clamp(1.8rem, 5vw, 2.9rem); font-weight: 800; line-height: 1.35; }
.hero h1 em { font-style: normal; color: var(--accent); }
.hero p.lead { margin: 20px auto 0; max-width: 620px; color: var(--text-muted); font-size: 1.05rem; }

/* screenshots */
.shots { display: flex; gap: 18px; justify-content: center; margin: 56px 0 8px; flex-wrap: wrap; }
.shots figure { width: min(240px, 44vw); }
.shots img {
  width: 100%; border-radius: 18px; border: 1px solid var(--border);
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.55); display: block;
}
.shots figcaption { margin-top: 10px; font-size: 0.78rem; color: var(--text-muted); }

/* sections */
section { padding: 64px 0; }
section h2 { font-size: 1.5rem; font-weight: 700; margin-bottom: 8px; }
section h2 + p.sub { color: var(--text-muted); margin-bottom: 32px; }

.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
.feature {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px;
}
.feature .num {
  display: inline-flex; align-items: center; justify-content: center;
  width: 28px; height: 28px; border-radius: 50%;
  background: var(--accent); color: #04070f; font-weight: 800; font-size: 0.85rem;
  margin-bottom: 14px;
}
.feature h3 { font-size: 1.05rem; margin-bottom: 8px; }
.feature p { font-size: 0.9rem; color: var(--text-muted); }

/* demo card */
.demo {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 28px; max-width: 560px; margin: 0 auto;
}
.demo .merchant { font-size: 0.85rem; color: var(--text-muted); }
.demo .answer { font-size: 1.15rem; font-weight: 700; margin: 10px 0 14px; }
.demo .rate { color: var(--accent); font-size: 2rem; font-weight: 800; }
.demo .rate small { font-size: 0.85rem; font-weight: 400; color: var(--text-muted); }
.demo .steps { margin-top: 18px; border-top: 1px solid var(--border); padding-top: 14px; }
.demo .steps li {
  list-style: none; display: flex; justify-content: space-between;
  font-size: 0.9rem; padding: 6px 0; color: var(--text-muted);
}
.demo .steps li b { color: var(--text); font-weight: 600; }
.demo .steps li .plus { color: var(--accent); }

/* comparison */
.compare-wrap { overflow-x: auto; }
table.compare {
  width: 100%; border-collapse: collapse; font-size: 0.9rem; min-width: 560px;
}
table.compare th, table.compare td {
  padding: 14px 16px; text-align: center; border-bottom: 1px solid var(--border);
}
table.compare th { font-size: 0.82rem; color: var(--text-muted); font-weight: 600; }
table.compare th:first-child, table.compare td:first-child {
  text-align: left; color: var(--text-muted); white-space: nowrap;
}
table.compare th.best { color: var(--accent); }
table.compare td.yes { color: var(--accent); font-weight: 700; }
table.compare td.part { color: var(--text-muted); }
table.compare td.no { color: rgba(255, 255, 255, 0.25); }
table.compare tr td:first-child { color: var(--text); }
.compare-note { margin-top: 14px; font-size: 0.78rem; color: var(--text-muted); }

/* release */
.release { text-align: center; }
.release .sub { margin-left: auto; margin-right: auto; }

/* footer */
footer.site {
  border-top: 1px solid var(--border); padding: 40px 0 56px;
  font-size: 0.85rem; color: var(--text-muted);
}
footer.site .links { display: flex; gap: 20px; flex-wrap: wrap; margin-bottom: 16px; }
footer.site a { color: var(--text-muted); text-decoration: none; }
footer.site a:hover { color: var(--text); }

/* legal pages */
.legal { max-width: 720px; margin: 0 auto; padding: 56px 20px 80px; }
.legal h1 { font-size: 1.5rem; margin-bottom: 6px; }
.legal .updated { font-size: 0.8rem; color: var(--text-muted); margin-bottom: 36px; }
.legal h2 { font-size: 1.05rem; margin: 32px 0 10px; color: var(--accent); }
.legal p, .legal li { font-size: 0.92rem; color: rgba(255, 255, 255, 0.78); }
.legal ul { padding-left: 1.4em; }
.legal .back { display: inline-block; margin-bottom: 28px; color: var(--text-muted); text-decoration: none; font-size: 0.85rem; }
.legal .back:hover { color: var(--text); }

@media (max-width: 640px) {
  .hero { padding: 56px 0 48px; }
  section { padding: 48px 0; }
}