* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
  min-height: 100vh;
  color: #eee;
  overflow: hidden;
}

/* Auth page */
.auth-container {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 20px;
}

.auth-card {
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 16px;
  padding: 40px;
  width: 100%;
  max-width: 380px;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.logo {
  font-size: 2rem;
  text-align: center;
  margin-bottom: 4px;
}

.subtitle {
  text-align: center;
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.9rem;
  margin-bottom: 28px;
}

.tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 24px;
}

.tab {
  flex: 1;
  padding: 10px;
  border: none;
  background: rgba(255, 255, 255, 0.06);
  color: rgba(255, 255, 255, 0.7);
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.95rem;
  transition: all 0.2s;
}

.tab:hover {
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
}

.tab.active {
  background: #e94560;
  color: #fff;
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.auth-form.hidden {
  display: none;
}

.auth-form input {
  padding: 12px 16px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 8px;
  background: rgba(0, 0, 0, 0.3);
  color: #fff;
  font-size: 1rem;
}

.auth-form input::placeholder {
  color: rgba(255, 255, 255, 0.4);
}

.auth-form input:focus {
  outline: none;
  border-color: #e94560;
}

.auth-form .error {
  color: #ff6b6b;
  font-size: 0.85rem;
  min-height: 20px;
}

.btn {
  padding: 12px 24px;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
  display: inline-block;
  text-align: center;
}

.btn-primary {
  background: linear-gradient(135deg, #e94560, #c73e54);
  color: #fff;
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(233, 69, 96, 0.4);
}

.btn-small {
  padding: 6px 12px;
  font-size: 0.85rem;
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
}

.btn-small:hover {
  background: rgba(255, 255, 255, 0.25);
}

/* Game page */
#game-wrapper {
  position: relative;
  width: 100vw;
  height: 100vh;
}

#game-canvas {
  display: block;
  width: 100%;
  height: 100%;
  background: linear-gradient(180deg, #87ceeb 0%, #98d8aa 40%, #90ee90 70%, #7ccd7c 100%);
}

#ui-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  padding: 16px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  pointer-events: none;
}

#ui-overlay .btn {
  pointer-events: auto;
}

.player-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

#username-display {
  font-weight: 600;
  font-size: 1rem;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
}

.hint {
  color: rgba(0, 0, 0, 0.6);
  font-size: 0.9rem;
  text-shadow: 0 1px 1px rgba(255, 255, 255, 0.5);
}