:root {
  --bg-top: #f6efe4;
  --bg-bottom: #d8e3ef;
  --panel: rgba(255, 255, 255, 0.82);
  --panel-border: rgba(18, 35, 61, 0.1);
  --text: #12233d;
  --muted: #53657d;
  --board: #1f4bb8;
  --board-shadow: #173b92;
  --empty: #f4f7fb;
  --red: #d94b38;
  --yellow: #f0c53f;
  --board-content-inset: 2.5rem;
  --sidebar-content-inset: 2.1rem;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Georgia, "Times New Roman", serif;
  color: var(--text);
  background: var(--bg-top);
}

.page {
  width: min(1100px, calc(100% - 2.5rem));
  margin: 0 auto;
  padding: 3rem 0 4rem;
}

.hero {
  margin-bottom: 2rem;
  padding-left: var(--board-content-inset);
}

.eyebrow {
  margin: 0 0 0.35rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-size: 0.8rem;
  color: var(--muted);
}

.hero h1 {
  margin: 0;
  font-size: clamp(2.75rem, 7vw, 4.8rem);
  line-height: 0.95;
}

.subtitle {
  max-width: 32rem;
  margin: 0.8rem 0 0;
  font-size: 1.05rem;
  color: var(--muted);
}

.subtitle-wrap {
  position: relative;
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
}

.subtitle-button {
  background: none;
  border: 0;
  padding: 0;
  text-align: left;
  cursor: pointer;
  font: inherit;
}

.subtitle-button:hover,
.subtitle-button:focus-visible {
  color: var(--text);
}

.subtitle-tooltip {
  position: absolute;
  top: calc(100% + 0.45rem);
  left: 0;
  z-index: 2;
  padding: 0.55rem 0.75rem;
  border-radius: 12px;
  background: rgba(18, 35, 61, 0.92);
  color: #ffffff;
  font-size: 0.9rem;
  line-height: 1.2;
  white-space: nowrap;
  box-shadow: 0 10px 24px rgba(18, 35, 61, 0.18);
}

.layout {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(280px, 1fr);
  gap: 1.5rem;
  align-items: start;
}

.board-panel,
.stats-panel,
.legend-panel {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 28px;
  backdrop-filter: blur(16px);
  box-shadow: 0 18px 50px rgba(18, 35, 61, 0.08);
}

.board-panel {
  padding: 1.5rem;
  overflow: hidden;
}

.board-shell {
  width: min(100%, 43rem);
  margin: 0 auto;
  padding: 1rem;
  border-radius: 22px;
  background: linear-gradient(180deg, var(--board), var(--board-shadow));
}

.board {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 0.75rem;
}

.cell {
  position: relative;
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: var(--empty);
  box-shadow:
    inset 0 8px 12px rgba(255, 255, 255, 0.55),
    inset 0 -8px 14px rgba(18, 35, 61, 0.15);
}

.cell.red {
  background: radial-gradient(circle at 30% 30%, #f09a86, var(--red));
}

.cell.yellow {
  background: radial-gradient(circle at 30% 30%, #f8e6a0, var(--yellow));
}

.cell.winning::after {
  content: "★";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  /* font-size: clamp(1.2rem, 2.8vw, 1.7rem); */
  font-size: clamp(2rem, 5vw, 3rem);
  line-height: 1;
  color: #d4a017;
  -webkit-text-stroke: 1px #111111;
  text-shadow:
    0 0 1px #111111,
    0 1px 4px rgba(18, 35, 61, 0.25);
}

.sidebar {
  display: grid;
  gap: 1.5rem;
}

.legend-panel {
  padding: 1.2rem 1.25rem;
}

.legend-panel .label,
.legend {
  padding-left: calc(var(--sidebar-content-inset) - 1.1rem);
}

.stats-panel {
  padding: 1rem;
  display: grid;
  gap: 0.9rem;
}

.stat-card {
  padding: 1rem 1.1rem;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.66);
  border: 1px solid rgba(18, 35, 61, 0.08);
}

.label {
  display: block;
  margin-bottom: 0.4rem;
  color: var(--muted);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.stat-card strong {
  font-size: 1.2rem;
}

.legend {
  display: grid;
  gap: 0.95rem;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.95rem;
}

.legend-swatch {
  width: 1.45rem;
  height: 1.45rem;
  border-radius: 999px;
  box-shadow: inset 0 0 0 1px rgba(18, 35, 61, 0.12);
  flex: 0 0 auto;
}

.legend-item strong {
  font-size: 1.15rem;
}

@media (max-width: 800px) {
  .page {
    width: min(100% - 1.25rem, 1100px);
    padding-top: 2rem;
  }

  .hero {
    padding-left: 1rem;
  }

  .legend-panel .label,
  .legend {
    padding-left: 0;
  }

  .layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    gap: 0.85rem;
  }

  .board-panel {
    padding: 1rem;
  }

  .board-shell {
    width: 100%;
    padding: 0.8rem;
  }

  .board {
    gap: 0.45rem;
  }
}

@media (max-width: 480px) {
  .page {
    width: calc(100% - 1rem);
    padding-top: 1.5rem;
    padding-bottom: 2rem;
  }

  .hero {
    margin-bottom: 1.35rem;
    padding-left: 0.75rem;
  }

  .legend-panel .label,
  .legend {
    padding-left: 0.5rem;
  }

  .hero h1 {
    font-size: clamp(2.2rem, 12vw, 3rem);
  }

  .subtitle {
    font-size: 0.98rem;
  }

  .board-panel {
    padding: 0.75rem;
    border-radius: 22px;
  }

  .board-shell {
    width: 100%;
    padding: 0.65rem;
    border-radius: 18px;
  }

  .board {
    gap: 0.32rem;
  }

  .cell.winning::after {
    font-size: 1.15rem;
  }

  .legend-panel,
  .stats-panel {
    border-radius: 22px;
  }

  .legend-panel {
    padding: 1rem;
  }

  .stat-card {
    padding: 0.9rem 1rem;
  }

  .legend {
    gap: 0.8rem;
  }

  .legend-item {
    gap: 0.8rem;
  }

  .legend-swatch {
    width: 1.3rem;
    height: 1.3rem;
  }

  .legend-item strong,
  .stat-card strong {
    font-size: 1.05rem;
  }
}