* {
  box-sizing: border-box;
}

:root {
  --bg-a: #020814;
  --bg-b: #071a2a;
  --panel: rgba(5, 15, 28, 0.86);
  --panel-border: rgba(122, 220, 255, 0.28);
  --text: #e6f8ff;
  --accent: #63ddff;
}

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 14% 18%, rgba(79, 203, 255, 0.14), transparent 28%),
    radial-gradient(circle at 84% 72%, rgba(67, 151, 255, 0.12), transparent 30%),
    linear-gradient(160deg, #01050d 0%, var(--bg-a) 45%, var(--bg-b) 100%);
}

.app {
  width: min(96vw, 860px);
  text-align: center;
  padding: 1rem;
}

.home-link {
  display: inline-block;
  color: #d4f8ff;
  text-decoration: none;
  padding: 0.35rem 0.9rem;
  border-radius: 999px;
  border: 1px solid rgba(126, 224, 255, 0.3);
  background: linear-gradient(180deg, rgba(18, 58, 86, 0.62), rgba(6, 23, 37, 0.78));
  box-shadow: inset 0 1px 0 rgba(182, 239, 255, 0.12), 0 10px 24px rgba(0, 0, 0, 0.28);
  transition: background 0.2s, border-color 0.2s;
}

.home-link:hover {
  background: linear-gradient(180deg, rgba(25, 78, 113, 0.72), rgba(8, 31, 48, 0.86));
  border-color: rgba(126, 224, 255, 0.48);
}

h1 {
  margin: 0.9rem 0 0.8rem;
  font-size: clamp(2rem, 5vw, 3rem);
  letter-spacing: 0.06em;
  color: var(--accent);
  text-shadow: 0 0 18px rgba(99, 221, 255, 0.32), 0 0 34px rgba(34, 128, 176, 0.22);
}

.panel-label {
  display: block;
  margin-bottom: 0.35rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.74rem;
  color: #9cdcf6;
  opacity: 0.9;
}

.player-input {
  width: 100%;
  margin-bottom: 1rem;
  padding: 0.65rem 0.8rem;
  border: 1px solid rgba(122, 220, 255, 0.28);
  border-radius: 10px;
  background: rgba(7, 21, 35, 0.94);
  color: var(--text);
  font: inherit;
  outline: none;
}

.player-input:focus {
  border-color: rgba(122, 220, 255, 0.5);
  box-shadow: 0 0 0 3px rgba(99, 221, 255, 0.08);
}

/* ── Main layout ── */
.game-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 220px;
  gap: 1.1rem;
  justify-items: center;
  align-items: start;
}

/* ── Canvas ── */
.canvas-wrapper {
  position: relative;
  width: min(calc(70vh * 12 / 20), 360px, 92vw);
  aspect-ratio: 12 / 20;
}

.overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  background: rgba(2, 8, 18, 0.74);
  border-radius: 10px;
  z-index: 5;
}

.overlay.hidden {
  display: none;
}

.overlay-content {
  width: min(92%, 280px);
  padding: 1rem;
  border-radius: 12px;
  border: 1px solid rgba(122, 220, 255, 0.28);
  background: rgba(4, 16, 28, 0.94);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.45);
  text-align: center;
}

#overlay-title {
  margin: 0 0 0.5rem;
  color: var(--accent);
  letter-spacing: 0.06em;
}

#overlay-message {
  margin: 0 0 0.75rem;
  color: #9cdcf6;
  font-size: 0.95rem;
}

.overlay .player-input {
  margin-bottom: 0.7rem;
}

.overlay-btn {
  width: 100%;
  padding: 0.6rem 0.75rem;
  border-radius: 10px;
  border: 1px solid rgba(122, 220, 255, 0.36);
  color: var(--accent);
  background: linear-gradient(180deg, rgba(18, 58, 86, 0.62), rgba(6, 23, 37, 0.78));
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

#tetris {
  display: block;
  width: 100%;
  height: 100%;
  border: 2px solid rgba(112, 220, 255, 0.44);
  border-radius: 10px;
  background: #0a1d31;
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.03), 0 18px 40px rgba(0, 0, 0, 0.46), 0 0 28px rgba(69, 190, 255, 0.1);
}

/* ── Right panel ── */
.panel {
  width: 100%;
  padding: 0.9rem;
  text-align: left;
  border-radius: 14px;
  background: var(--panel);
  border: 1px solid var(--panel-border);
  box-shadow: inset 0 1px 0 rgba(194, 240, 255, 0.06), 0 18px 40px rgba(0, 0, 0, 0.34);
}

.stat {
  display: grid;
  gap: 0.1rem;
  margin-bottom: 1.2rem;
}

.label {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.74rem;
  color: #9cdcf6;
  opacity: 0.9;
}

.value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent);
}

.board-title {
  margin: 0 0 0.45rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.8rem;
  color: #9cdcf6;
}

#leaderboard-list {
  list-style: none;
  counter-reset: leaderboard;
  margin: 0 0 1rem;
  padding: 0;
}

#leaderboard-list li {
  counter-increment: leaderboard;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.45rem;
  padding: 0.45rem 0.35rem;
  border-bottom: 1px solid rgba(122, 220, 255, 0.12);
  font-size: 0.9rem;
}

#leaderboard-list li:last-child {
  border-bottom: none;
}

#leaderboard-list li::before {
  content: counter(leaderboard) ".";
  min-width: 1.35rem;
  color: var(--accent);
  font-weight: 700;
}

#leaderboard-list li .lb-name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

#leaderboard-list li .lb-score {
  color: var(--accent);
  font-weight: 700;
}

#leaderboard-list li.highlight {
  background: rgba(99, 221, 255, 0.1);
  border-radius: 6px;
}

#leaderboard-list .empty-msg {
  display: block;
  padding: 0.6rem 0.2rem;
  color: #6f9bb7;
  font-style: italic;
}

.controls {
  font-size: 0.82rem;
  line-height: 1.7;
  color: #6f9bb7;
}

@media (max-width: 700px) {
  .game-wrap {
    grid-template-columns: 1fr;
  }

  .canvas-wrapper {
    width: min(92vw, 320px);
  }

  .panel {
    width: min(92vw, 360px);
    text-align: center;
  }
}