:root {
  --bg-top: #f0f4fb;
  --bg-bottom: #d6e0f2;
  --panel-bg: rgba(255, 255, 255, 0.84);
  --panel-border: rgba(255, 255, 255, 0.72);
  --board-bg: #a6b6d9;
  --cell-bg: rgba(241, 245, 255, 0.9);
  --text: #1c2740;
  --muted: #566180;
  --btn-bg: #4c68d7;
  --btn-bg-hover: #3e57be;
  --shadow: 0 24px 56px rgba(34, 52, 94, 0.18);
  --board-size: min(70vh, 58vw, 760px);
  --panel-width: min(34vw, 420px);
  --gap: clamp(8px, 1.2vw, 14px);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  height: 100vh;
  overflow: hidden;
  font-family: "Avenir Next", "Trebuchet MS", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 14% 12%, rgba(255, 255, 255, 0.65), transparent 36%),
    linear-gradient(150deg, var(--bg-top), var(--bg-bottom));
}

.page {
  height: 100vh;
  display: grid;
  grid-template-columns: minmax(280px, var(--panel-width)) minmax(320px, var(--board-size));
  align-items: center;
  justify-content: center;
  gap: clamp(18px, 2.4vw, 34px);
  padding: clamp(12px, 2.2vw, 24px);
}

.panel {
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: 22px;
  padding: clamp(16px, 2.1vw, 24px);
  box-shadow: var(--shadow);
  backdrop-filter: blur(8px);
}

.heading h1 {
  margin: 0 0 8px;
  font-size: clamp(2rem, 4.2vw, 3.6rem);
  line-height: 0.95;
}

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

.stats {
  margin-top: 14px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.stat-card {
  background: rgba(233, 238, 252, 0.82);
  border: 1px solid rgba(255, 255, 255, 0.62);
  border-radius: 12px;
  padding: 10px 12px;
  text-align: center;
}

.label {
  display: block;
  text-transform: uppercase;
  font-size: 0.74rem;
  color: #5d6b92;
  letter-spacing: 0.06em;
}

.stat-card strong {
  display: block;
  margin-top: 3px;
  font-size: clamp(1.2rem, 2vw, 1.9rem);
}

.primary-btn {
  width: 100%;
  margin-top: 14px;
  border: 0;
  border-radius: 12px;
  padding: 11px 14px;
  background: var(--btn-bg);
  color: #fff;
  font-weight: 700;
  cursor: pointer;
}

.primary-btn:hover {
  background: var(--btn-bg-hover);
}

.board-wrap {
  width: min(100%, var(--board-size));
}

.board {
  width: 100%;
  aspect-ratio: 1;
  padding: var(--gap);
  border-radius: 20px;
  background: var(--board-bg);
  box-shadow: var(--shadow);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, minmax(0, 1fr));
  gap: var(--gap);
}

.cell {
  border: 0;
  border-radius: 14px;
  background: var(--cell-bg);
  color: var(--text);
  font-size: clamp(2rem, 7vw, 4.8rem);
  font-weight: 800;
  cursor: pointer;
}

.cell:disabled {
  cursor: not-allowed;
  opacity: 0.9;
}

@media (max-width: 980px) {
  body {
    overflow: auto;
  }

  .page {
    height: auto;
    min-height: 100vh;
    grid-template-columns: 1fr;
    justify-items: center;
    align-content: center;
    gap: 14px;
    padding: 14px;
  }

  .panel,
  .board-wrap {
    width: min(92vw, 560px);
  }
}

@media (max-width: 560px) {
  .stats {
    grid-template-columns: 1fr;
  }
}