:root {
  color-scheme: dark;
  --bg: #03130f;
  --panel: rgba(5, 38, 29, 0.9);
  --panel-strong: rgba(22, 68, 54, 0.9);
  --line: rgba(242, 206, 117, 0.22);
  --line-soft: rgba(255, 255, 255, 0.09);
  --text: #f7f2df;
  --muted: #abc3b9;
  --gold: #f2ce75;
  --gold-deep: #a87525;
  --tile-w: clamp(23px, 3vw, 33px);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 72px;
}

body {
  margin: 0;
  min-height: 100dvh;
  background:
    radial-gradient(circle at 14% 0, rgba(60, 150, 112, 0.24), transparent 34rem),
    linear-gradient(145deg, #0b3026, var(--bg) 62%);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", "YuGothic", sans-serif;
  line-height: 1.6;
}

.yaku-page {
  width: min(1100px, 100%);
  margin: 0 auto;
  padding: max(14px, env(safe-area-inset-top)) max(14px, env(safe-area-inset-right)) max(32px, env(safe-area-inset-bottom)) max(14px, env(safe-area-inset-left));
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin: -2px -14px 14px;
  padding: 9px max(14px, env(safe-area-inset-right)) 9px max(14px, env(safe-area-inset-left));
  border-bottom: 1px solid var(--line);
  background: rgba(3, 19, 15, 0.88);
  color: var(--gold);
  letter-spacing: 0.08em;
  backdrop-filter: blur(12px);
}

.back {
  display: inline-flex;
  align-items: center;
  min-height: 42px;
  padding: 7px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.07);
  color: var(--text);
  font-weight: 800;
  text-decoration: none;
}

.hero {
  padding: 12px 2px 18px;
}

.eyebrow {
  display: block;
  color: var(--gold);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.14em;
}

h1 {
  margin: 3px 0 7px;
  font-size: clamp(30px, 6vw, 48px);
  line-height: 1.1;
}

.hero p {
  max-width: 780px;
  margin: 0;
  color: var(--muted);
  font-size: clamp(16px, 2.4vw, 19px);
}

.level-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 15px;
}

.level-nav a {
  min-width: 66px;
  padding: 8px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(242, 206, 117, 0.08);
  color: var(--gold);
  font-size: 14px;
  font-weight: 900;
  text-align: center;
  text-decoration: none;
}

.yaku-section {
  margin: 0 0 22px;
  scroll-margin-top: 68px;
}

.section-heading {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 10px;
  padding: 0 2px;
}

.section-heading h2 {
  margin: 0;
  color: var(--gold);
  font-size: clamp(23px, 3.5vw, 31px);
}

.section-heading span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.yaku-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.yaku-card {
  min-width: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 17px;
  background: linear-gradient(150deg, var(--panel-strong), var(--panel));
  box-shadow: 0 14px 32px rgba(0, 0, 0, 0.23);
}

.yaku-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 11px 13px 9px;
  border-bottom: 1px solid var(--line-soft);
}

.yaku-card h3 {
  min-width: 0;
  margin: 0;
  font-size: clamp(18px, 2.6vw, 22px);
  line-height: 1.2;
}

.han-badge {
  flex: 0 0 auto;
  padding: 3px 8px;
  border: 1px solid rgba(242, 206, 117, 0.38);
  border-radius: 999px;
  background: rgba(242, 206, 117, 0.1);
  color: var(--gold);
  font-size: 12px;
  font-weight: 900;
  white-space: nowrap;
}

.tile-sample-wrap {
  padding: 10px 12px 8px;
}

.sample-label {
  display: block;
  margin-bottom: 5px;
  color: var(--muted);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.tile-sample {
  display: flex;
  align-items: flex-end;
  gap: 0;
  width: 100%;
  max-width: 100%;
  min-width: 0;
  overflow: hidden;
  padding: 1px 1px 5px;
}

.tile-group {
  display: contents;
}

.tile-group img {
  display: block;
  flex: 0 1 var(--tile-w);
  min-width: 0;
  width: var(--tile-w);
  max-width: var(--tile-w);
  height: auto;
  aspect-ratio: 5 / 7;
  object-fit: fill;
  filter: drop-shadow(0 2px 2px rgba(0, 0, 0, 0.38));
}

.yaku-description {
  margin: 0;
  padding: 0 13px 13px;
  color: var(--text);
  font-size: clamp(14px, 2vw, 16px);
  line-height: 1.55;
}

.reference-note {
  margin-top: 4px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 15px;
  background: rgba(242, 206, 117, 0.07);
  color: var(--muted);
  font-size: 14px;
}

.reference-note strong {
  color: var(--gold);
}

.reference-note p {
  margin: 3px 0 0;
}

@media (max-width: 720px) {
  :root {
    --tile-w: clamp(22px, 6.5vw, 32px);
  }

  .yaku-grid {
    grid-template-columns: 1fr;
    margin-inline: -10px;
  }

  .tile-sample-wrap {
    padding: 10px 4px 8px;
  }
}

@media (orientation: landscape) and (max-height: 520px) {
  :root {
    --tile-w: clamp(21px, 2.9vw, 28px);
  }

  .hero {
    padding-top: 5px;
  }

  .yaku-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}