:root {
  --ink: #102032;
  --line: rgba(16, 32, 50, 0.2);
  --panel: rgba(255, 255, 255, 0.9);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: "Sora", sans-serif;
  background:
    radial-gradient(circle at 82% 14%, rgba(0, 195, 140, 0.25), transparent 34%),
    radial-gradient(circle at 12% 22%, rgba(255, 126, 95, 0.2), transparent 34%),
    linear-gradient(140deg, #f0fff9, #f4f7ff 45%, #fff9f1);
}

.shell {
  width: min(1200px, 94vw);
  margin: 0 auto;
  padding: 2rem 0 2.4rem;
}

.kicker {
  margin: 0;
  letter-spacing: 0.17em;
  text-transform: uppercase;
  font-size: 0.8rem;
  color: #47718a;
}

header h1 {
  margin: 0.2rem 0 0;
  font-size: clamp(2rem, 5vw, 3.2rem);
}

.layout {
  margin-top: 1rem;
  display: grid;
  grid-template-columns: auto 300px;
  gap: 1rem;
}

.board-wrap {
  position: relative;
  border: 2px solid var(--line);
  border-radius: 18px;
  overflow: hidden;
  box-shadow: 0 16px 42px rgba(16, 32, 50, 0.2);
  background: #0f1b2f;
}

#board {
  display: block;
  width: min(72vw, 720px);
  height: auto;
}

.overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  text-align: center;
  gap: 0.6rem;
  background: rgba(15, 27, 47, 0.7);
  color: #fff;
}

.overlay[hidden] {
  display: none !important;
}

.panel {
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--panel);
  box-shadow: 0 16px 42px rgba(16, 32, 50, 0.12);
  padding: 1rem;
  display: grid;
  gap: 0.6rem;
  align-content: start;
}

button {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.6rem 0.72rem;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  background: #fff;
}

button:hover:enabled {
  background: #effff8;
}

button:disabled {
  opacity: 0.55;
}

.stats {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  padding: 0.6rem;
}

.stats p {
  margin: 0.35rem 0;
  display: flex;
  justify-content: space-between;
}

.meta {
  margin: 0;
  font-size: 0.84rem;
  color: #4a5e73;
}

kbd {
  border: 1px solid rgba(16, 32, 50, 0.24);
  border-radius: 6px;
  padding: 0.08rem 0.28rem;
  background: #fff;
}

@media (max-width: 980px) {
  .layout {
    grid-template-columns: 1fr;
  }

  #board {
    width: min(92vw, 720px);
  }
}