:root {
  color-scheme: dark;
  --bg: #071d18;
  --panel: rgba(255, 255, 255, 0.08);
  --panel-strong: rgba(255, 255, 255, 0.13);
  --line: rgba(255, 255, 255, 0.16);
  --text: #f8f4de;
  --muted: rgba(248, 244, 222, 0.72);
  --accent: #f2ce75;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100dvh;
  background:
    radial-gradient(circle at top left, rgba(242, 206, 117, 0.16), transparent 36rem),
    linear-gradient(145deg, var(--bg), #0d2f28 62%, #061713);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", "YuGothic", sans-serif;
  font-size: 18px;
  line-height: 1.65;
}

.page {
  width: min(980px, 100%);
  margin: 0 auto;
  padding: max(18px, env(safe-area-inset-top)) 16px max(28px, env(safe-area-inset-bottom));
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin: -4px -16px 16px;
  padding: 10px 16px;
  background: rgba(7, 29, 24, 0.86);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}

.back {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--text);
  text-decoration: none;
  background: rgba(255, 255, 255, 0.08);
  font-weight: 700;
}

h1 {
  margin: 0 0 6px;
  font-size: clamp(30px, 7vw, 48px);
  line-height: 1.1;
}

.intro {
  margin: 0 0 20px;
  color: var(--muted);
  font-size: 18px;
}

.summary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 10px;
  margin: 0 0 18px;
}

.summary-card,
.category {
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--panel);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.26);
}

.summary-card {
  padding: 14px;
}

.summary-card span {
  display: block;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.summary-card strong {
  display: block;
  margin-top: 2px;
  color: var(--accent);
  font-size: 23px;
  line-height: 1.25;
}

.category {
  margin: 14px 0;
  overflow: hidden;
}

.category h2 {
  margin: 0;
  padding: 14px 16px;
  background: var(--panel-strong);
  border-bottom: 1px solid var(--line);
  font-size: 22px;
}

.rule-list {
  margin: 0;
  padding: 0;
}

.rule {
  display: grid;
  grid-template-columns: minmax(112px, 0.35fr) 1fr;
  gap: 12px;
  padding: 13px 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.rule:first-child {
  border-top: 0;
}

.rule dt {
  margin: 0;
  color: var(--accent);
  font-weight: 800;
}

.rule dd {
  margin: 0;
  color: var(--text);
}

.note {
  margin: 18px 0 0;
  padding: 12px 14px;
  border: 1px solid rgba(242, 206, 117, 0.34);
  border-radius: 14px;
  background: rgba(242, 206, 117, 0.08);
  color: var(--muted);
  font-size: 15px;
}

.note a {
  color: var(--accent);
}

@media (max-width: 560px) {
  body {
    font-size: 17px;
  }

  .rule {
    grid-template-columns: 1fr;
    gap: 4px;
  }
}