:root {
  color-scheme: dark;
  --bg: #030712;
  --panel: rgba(15, 23, 42, 0.82);
  --panel-strong: rgba(17, 24, 39, 0.95);
  --border: rgba(148, 163, 184, 0.2);
  --text: #f8fafc;
  --muted: #cbd5e1;
  --accent: #38bdf8;
  --accent-2: #22c55e;
  --shadow: 0 18px 45px rgba(2, 6, 23, 0.4);
  font-family: Inter, "Segoe UI", Roboto, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at top left, rgba(56, 189, 248, 0.16), transparent 24%),
    linear-gradient(135deg, #020617 0%, #111827 45%, #0f172a 100%);
  color: var(--text);
}

.app-shell {
  display: grid;
  gap: 1.1rem;
  max-width: 1120px;
  margin: 0 auto;
  padding: 1.1rem;
}

header {
  padding: 1.2rem 1.35rem;
  border: 1px solid var(--border);
  border-radius: 24px;
  background: linear-gradient(135deg, rgba(15, 23, 42, 0.95), rgba(30, 41, 59, 0.88));
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
}

header h1 {
  margin: 0 0 0.35rem;
  font-size: clamp(1.5rem, 2.3vw, 2.1rem);
}

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

.panel {
  padding: 1rem 1.1rem;
  border-radius: 22px;
  border: 1px solid var(--border);
  background: var(--panel);
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
}

.status-block,
.info-block,
.controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.status-block {
  margin-bottom: 0.8rem;
  padding: 0.7rem 0.9rem;
  border-radius: 999px;
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.2);
}

.info-block {
  display: grid;
  gap: 0.35rem;
  margin-bottom: 0.9rem;
}

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

.register-form {
  display: grid;
  gap: 0.8rem;
  margin-top: 0.8rem;
}

.register-form label {
  display: grid;
  gap: 0.4rem;
  font-size: 0.95rem;
  color: var(--muted);
}

.register-form input[type="text"],
.register-form input[type="color"] {
  width: 100%;
  padding: 0.8rem 0.9rem;
  border-radius: 14px;
  border: 1px solid rgba(148, 163, 184, 0.24);
  background: rgba(2, 6, 23, 0.7);
  color: inherit;
  outline: none;
  transition: border-color 160ms ease, box-shadow 160ms ease;
}

.register-form input[type="text"]:focus,
.register-form input[type="color"]:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.16);
}

.register-form button,
.controls button {
  padding: 0.8rem 1rem;
  border: none;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--accent-2), #15803d);
  color: #052e16;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 10px 20px rgba(34, 197, 94, 0.24);
  transition: transform 160ms ease, box-shadow 160ms ease;
}

.register-form button:hover,
.controls button:hover {
  transform: translateY(-1px);
  box-shadow: 0 12px 24px rgba(34, 197, 94, 0.28);
}

.controls button#new-player-button {
  background: linear-gradient(135deg, var(--accent), #2563eb);
  color: var(--text);
}

.register-form button:disabled,
.controls button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  box-shadow: none;
  transform: none;
}

main {
  display: flex;
  justify-content: center;
}

.leaderboard-panel {
  display: grid;
  gap: 0.8rem;
}

.leaderboard-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.65rem;
  flex-wrap: wrap;
}

.leaderboard-header h2 {
  margin: 0;
  font-size: 1.05rem;
}

.leaderboard-header p {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.leaderboard-list {
  display: grid;
  gap: 0.6rem;
}

.leaderboard-item {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 0.9rem;
  align-items: center;
  padding: 0.8rem 0.9rem;
  border-radius: 16px;
  border: 1px solid rgba(148, 163, 184, 0.16);
  background: rgba(2, 6, 23, 0.5);
}

.leaderboard-item.is-self {
  border-color: rgba(56, 189, 248, 0.4);
  box-shadow: inset 0 0 0 1px rgba(56, 189, 248, 0.18);
}

.leaderboard-rank {
  min-width: 2.6rem;
  text-align: center;
  font-weight: 700;
  color: var(--accent);
}

.leaderboard-player {
  display: grid;
  gap: 0.2rem;
}

.leaderboard-player span {
  color: var(--muted);
  font-size: 0.9rem;
}

.leaderboard-time {
  font-variant-numeric: tabular-nums;
  color: var(--muted);
  font-weight: 600;
}

.leaderboard-empty {
  padding: 0.75rem 0.9rem;
  border-radius: 14px;
  background: rgba(2, 6, 23, 0.45);
  color: var(--muted);
}

canvas {
  width: 100%;
  max-width: 800px;
  border-radius: 24px;
  box-shadow: 0 24px 60px rgba(2, 6, 23, 0.45);
  background: #0b1220;
  border: 1px solid rgba(148, 163, 184, 0.18);
}

.hidden {
  display: none !important;
}

#game-board {
  display: flex;
  justify-content: center;
  padding: 0.25rem 0;
}

.debug-panel h2 {
  margin-top: 0;
  margin-bottom: 0.55rem;
}

.debug-panel ul {
  margin: 0 0 0.7rem 1.1rem;
  color: var(--muted);
  line-height: 1.6;
}

#debug {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.5;
  color: var(--muted);
}