:root {
  --bg: #ffffff;
  --text: #0f172a;
  --muted: #64748b;
  --border: #e2e8f0;
  --accent: #0ea5e9;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  font-family:
    system-ui,
    -apple-system,
    Segoe UI,
    Roboto,
    "Hiragino Kaku Gothic ProN",
    "Noto Sans JP",
    "Yu Gothic UI",
    "Yu Gothic",
    "Meiryo",
    sans-serif;
  color: var(--text);
  background: var(--bg);
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  height: auto;
}

.container {
  width: min(1120px, 100%);
  margin-inline: auto;
  padding: 0 16px;
}

.skip {
  position: absolute;
  left: -9999px;
  top: auto;
}

.skip:focus {
  left: 16px;
  top: 16px;
  background: #fff;
  border: 2px solid var(--accent);
  padding: 8px 12px;
  border-radius: 10px;
}

header.site {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.site-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.brand .logo {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: linear-gradient(135deg, #22d3ee, #0ea5e9);
  display: grid;
  place-items: center;
  color: #fff;
  font-weight: 900;
}

.brand small {
  color: var(--muted);
  font-weight: 600;
}

.hero {
  padding: clamp(28px, 7vw, 56px) 0;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, #fff, #f8fafc);
}

.hero h1 {
  font-size: clamp(26px, 5vw, 40px);
  margin: 0 0 8px;
}

.hero p {
  color: var(--muted);
  margin: 0;
}

section {
  padding: 32px 0;
}

.sec {
  font-size: 20px;
  margin: 0 0 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.card {
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 16px;
  background: #fff;
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.02);
}

.game-title {
  margin: 0 0 6px;
  font-size: 18px;
}

.card-note {
  margin: 10px 0 0;
  color: var(--muted);
}

.grid {
  display: grid;
  gap: 16px;
}

.meta {
  color: var(--muted);
  font-size: 12px;
  display: flex;
  gap: 12px;
  align-items: center;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1px solid var(--border);
  padding: 2px 8px;
  border-radius: 9999px;
  font-size: 12px;
  color: var(--muted);
}

footer.site {
  border-top: 1px solid var(--border);
  color: var(--muted);
}

footer .row {
  display: grid;
  gap: 12px;
  padding: 24px 0;
}

@media (min-width: 768px) {
  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }

  footer .row {
    grid-template-columns: 1fr auto;
  }
}