:root {
  --bg-dark: #0a0512;
  --purple-core: #7c3aed;
  --purple-bright: #a855f7;
  --purple-glow: rgba(168, 85, 247, 0.4);
  --green-xp: #22c55e;
  --red-hp: #ef4444;
  --text-primary: #ffffff;
  --nav-height: 70px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  user-select: none;
}

body {
  background-color: var(--bg-dark);
  color: var(--text-primary);
  font-family: 'Rajdhani', sans-serif;
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.game-viewport {
  margin-top: var(--nav-height);
  width: 100vw;
  height: calc(100vh - var(--nav-height));
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 1rem;
}

.game-container {
  position: relative;
  width: 100%;
  height: 100%;
  max-width: 100%;
  max-height: 100%;
  background: #110920;
  border: 2px solid var(--purple-core);
  border-radius: 16px;
  box-shadow: 0 0 25px var(--purple-glow);
  overflow: hidden;
}

canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.hud {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  padding: 12px 16px;
  pointer-events: none;
  z-index: 10;
  background: linear-gradient(to bottom, rgba(10, 5, 18, 0.85), transparent);
}

.hud-top {
  display: flex;
  align-items: center;
  position: relative;
  width: 100%;
  margin-bottom: 8px;
}

.stat-group.time-group {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}

.stat-group.kills-group {
  margin-left: auto;
  margin-right: 20px;
}

.stat-group {
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.stat-label {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--purple-bright);
  letter-spacing: 0.1em;
}

.stat-value {
  font-family: 'Orbitron', sans-serif;
  font-size: 1.1rem;
  font-weight: 700;
  text-shadow: 0 0 8px var(--purple-glow);
}

.xp-bar-container, .hp-bar-container {
  width: 100%;
  height: 8px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 4px;
}

.hp-bar-container {
  height: 6px;
}

.xp-bar-fill {
  width: 0%;
  height: 100%;
  background: var(--green-xp);
  box-shadow: 0 0 8px var(--green-xp);
  transition: width 0.15s ease-out;
}

.hp-bar-fill {
  width: 100%;
  height: 100%;
  background: var(--red-hp);
  box-shadow: 0 0 8px var(--red-hp);
  transition: width 0.15s ease-out;
}

.overlay-screen {
  position: absolute;
  inset: 0;
  background: rgba(10, 5, 18, 0.92);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  z-index: 20;
  gap: 16px;
  backdrop-filter: blur(4px);
}

.overlay-screen.hidden {
  display: none;
}

.game-title {
  font-family: 'Orbitron', sans-serif;
  font-size: 2.8rem;
  font-weight: 900;
  letter-spacing: 0.08em;
  background: linear-gradient(135deg, #ffffff, var(--purple-bright));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 0 0 20px var(--purple-glow);
}

.game-title.over {
  background: linear-gradient(135deg, #ffffff, var(--red-hp));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.game-subtitle, .level-up-subtitle {
  font-size: 0.95rem;
  letter-spacing: 0.25em;
  color: var(--purple-bright);
}

.level-up-title {
  font-family: 'Orbitron', sans-serif;
  font-size: 2.2rem;
  color: #ffd700;
  text-shadow: 0 0 15px rgba(255, 215, 0, 0.5);
}

.btn {
  padding: 12px 32px;
  font-family: 'Orbitron', sans-serif;
  font-size: 1rem;
  font-weight: 700;
  color: #ffffff;
  background: var(--purple-core);
  border: none;
  border-radius: 8px;
  cursor: pointer;
  box-shadow: 0 0 15px var(--purple-glow);
  transition: transform 0.15s, background 0.15s;
}

.btn:hover {
  background: var(--purple-bright);
  transform: scale(1.05);
}

.upgrade-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 80%;
  max-width: 400px;
}

.upgrade-card {
  background: rgba(124, 58, 237, 0.15);
  border: 1px solid var(--purple-core);
  border-radius: 8px;
  padding: 12px 16px;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, transform 0.15s;
}

.upgrade-card:hover {
  background: rgba(168, 85, 247, 0.3);
  border-color: var(--purple-bright);
  transform: translateX(4px);
}

.upgrade-name {
  font-family: 'Orbitron', sans-serif;
  font-size: 1rem;
  color: #ffffff;
  margin-bottom: 2px;
}

.upgrade-desc {
  font-size: 0.8rem;
  color: #cbd5e1;
}

.final-stats {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 1.1rem;
  font-weight: 600;
  color: #cbd5e1;
  text-align: center;
}

.upgrade-card {
  display: flex;
  align-items: center;
  gap: 12px;
}

.upgrade-icon {
  width: 36px;
  height: 36px;
  object-fit: contain;
  flex-shrink: 0;
}

.upgrade-info {
  display: flex;
  flex-direction: column;
}

.upgrades-display {
  position: absolute;
  top: 75px;
  left: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 15;
  pointer-events: none;
}

.upgrade-hud-item {
  display: flex;
  align-items: center;
  gap: 6px;
  background: rgba(10, 5, 18, 0.75);
  border: 1px solid var(--purple-core);
  border-radius: 6px;
  padding: 4px 8px;
  backdrop-filter: blur(4px);
  box-shadow: 0 0 10px rgba(124, 58, 237, 0.2);
}

.upgrade-hud-icon {
  width: 24px;
  height: 24px;
  object-fit: contain;
}

.upgrade-hud-count {
  font-family: 'Orbitron', sans-serif;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--purple-bright);
}

.audio-controls {
  display: flex;
  flex-direction: column;
  gap: 4px;
  pointer-events: auto;
}

.slider-group {
  display: flex;
  align-items: center;
  gap: 6px;
}

.slider-group input[type="range"] {
  width: 70px;
  height: 4px;
  accent-color: var(--purple-bright);
  cursor: pointer;
}