* { box-sizing: border-box; }

:root {
  --bg: #1e2430;
  --panel: #262d3d;
  --text: #eef1f7;
  --muted: #9aa4b8;
  --accent: #4f8ef7;
  --accent-dark: #3a6fd0;
  --white-box: #f4f4f4;
  --black-box: #2a2f3a;
  --border: #3a4256;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

header {
  text-align: center;
  padding: 1.5rem 1rem 0.5rem;
}

header h1 {
  margin: 0;
  font-size: 1.6rem;
}

main {
  max-width: 640px;
  margin: 0 auto;
  padding: 1rem;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
}

.lobby-card {
  text-align: center;
  padding: 0.5rem 0 1rem;
}

.lobby-card h2 {
  margin: 0 0 0.4rem;
  font-size: 1.1rem;
}

.lobby-card p {
  color: var(--muted);
  margin: 0 0 1rem;
  font-size: 0.9rem;
}

.lobby-divider {
  text-align: center;
  color: var(--muted);
  margin: 0.5rem 0;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

#joinForm {
  display: flex;
  gap: 0.5rem;
  justify-content: center;
}

#joinCodeInput {
  flex: 1;
  max-width: 180px;
  padding: 0.6rem 0.8rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 1rem;
  text-align: center;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.btn {
  border: none;
  border-radius: 8px;
  padding: 0.65rem 1.2rem;
  font-size: 0.95rem;
  cursor: pointer;
  background: var(--accent);
  color: white;
  transition: background 0.15s ease;
}

.btn:hover { background: var(--accent-dark); }

.btn-small {
  padding: 0.4rem 0.7rem;
  font-size: 0.8rem;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
}

.btn-small:hover { background: var(--border); }

.difficulty-row {
  display: flex;
  gap: 0.5rem;
  justify-content: center;
  flex-wrap: wrap;
}

.btn-difficulty--easy { background: #3b8f5e; }
.btn-difficulty--easy:hover { background: #2f7a4d; }

.btn-difficulty--medium { background: #c98a2e; }
.btn-difficulty--medium:hover { background: #b07726; }

.btn-difficulty--hard { background: #b04747; }
.btn-difficulty--hard:hover { background: #983c3c; }

.error-text {
  color: #ff8080;
  text-align: center;
  margin-top: 1rem;
  font-size: 0.9rem;
}

.game-topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.room-code {
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.room-code strong {
  letter-spacing: 0.1em;
  color: var(--accent);
}

.scoreboard {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.score-box {
  flex: 1;
  text-align: center;
  padding: 0.5rem;
  border-radius: 8px;
  background: var(--bg);
  border: 1px solid var(--border);
}

.score-box.me {
  border-color: var(--accent);
}

.score-label {
  display: block;
  font-size: 0.75rem;
  color: var(--muted);
  text-transform: uppercase;
}

.score-value {
  display: block;
  font-size: 1.4rem;
  font-weight: 600;
}

.status-text {
  text-align: center;
  margin-bottom: 1rem;
  min-height: 1.4em;
  font-size: 1rem;
}

.board-wrap {
  max-width: 480px;
  margin: 0 auto;
}

.post-game {
  text-align: center;
  margin-top: 1.2rem;
}

.toast {
  position: fixed;
  bottom: 1.2rem;
  left: 50%;
  transform: translateX(-50%);
  background: var(--panel);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.6rem 1rem;
  border-radius: 8px;
  font-size: 0.9rem;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.3);
  z-index: 100;
}

@media (max-width: 480px) {
  main { padding: 0.5rem; }
  .panel { padding: 1rem; }
}