:root {
  --bg-dark: #07090e;
  --bg-panel: rgba(16, 22, 34, 0.85);
  --border-glass: rgba(255, 255, 255, 0.12);
  --color-cyan: #00f3ff;
  --color-magenta: #ff0055;
  --color-amber: #ffb700;
  --color-text-main: #f0f4fc;
  --color-text-muted: #8a99b5;
  --font-family-main: 'Outfit', sans-serif;
  --font-family-mono: 'Space Grotesk', monospace;
  --glass-shadow: 0 20px 50px rgba(0, 0, 0, 0.6), inset 0 1px 0 rgba(255, 255, 255, 0.15);
}

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

body, html {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: var(--bg-dark);
  font-family: var(--font-family-main);
  color: var(--color-text-main);
}

/* 100% Fullscreen Container & Canvas Wrapper */
#app-container {
  position: relative;
  width: 100vw;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 0;
  margin: 0;
  overflow: hidden;
}

#canvas-wrapper {
  position: relative;
  width: 100vw;
  height: 100vh;
  max-width: 100vw;
  max-height: 100vh;
  border-radius: 0;
  overflow: hidden;
  background: #060911;
}

#game-canvas {
  width: 100vw;
  height: 100vh;
  display: block;
  object-fit: fill;
}

/* UI Overlay Layer */
#ui-overlay {
  position: absolute;
  top: 1rem;
  left: 50%;
  transform: translateX(-50%);
  width: calc(100vw - 2rem);
  max-width: 1600px;
  height: calc(100vh - 2rem);
  pointer-events: none;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  z-index: 10;
}

/* Header HUD */
.hud-header {
  pointer-events: auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.85rem 1.5rem;
  background: var(--bg-panel);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-glass);
  border-radius: 14px;
  box-shadow: var(--glass-shadow);
}

.hud-stats {
  display: flex;
  gap: 1rem;
}

.stat-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  background: rgba(0, 0, 0, 0.3);
  padding: 0.4rem 0.85rem;
  border-radius: 10px;
  border: 1px solid var(--border-glass);
  min-width: 85px;
}

.stat-card.timer-card {
  min-width: 145px;
}

.stat-label {
  font-family: var(--font-family-mono);
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  color: var(--color-text-muted);
}

.stat-value {
  font-family: var(--font-family-mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text-main);
  margin-top: 2px;
  font-variant-numeric: tabular-nums;
  display: inline-block;
  text-align: center;
}

.highlight-timer {
  color: var(--color-cyan) !important;
  font-family: var(--font-family-mono);
  font-size: 1.1rem;
  letter-spacing: 0.5px;
  text-shadow: 0 0 10px rgba(0, 243, 255, 0.5);
  font-variant-numeric: tabular-nums;
  min-width: 110px;
  display: inline-block;
  text-align: center;
}

.hud-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Controls Bar */
.hud-controls {
  pointer-events: auto;
  align-self: center;
  padding: 0.6rem 1.25rem;
  background: var(--bg-panel);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-glass);
  border-radius: 30px;
  box-shadow: var(--glass-shadow);
  margin-bottom: 0.5rem;
}

.control-tip {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  font-weight: 500;
}

kbd {
  display: inline-block;
  padding: 2px 6px;
  font-family: var(--font-family-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-cyan);
  background: rgba(0, 243, 255, 0.1);
  border: 1px solid rgba(0, 243, 255, 0.3);
  border-radius: 4px;
  margin: 0 2px;
}

/* Button Styles */
button {
  font-family: var(--font-family-main);
  font-weight: 600;
  border: none;
  cursor: pointer;
  outline: none;
  transition: all 0.2s cubic-bezier(0.25, 1, 0.5, 1);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.btn-icon {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-glass);
  color: var(--color-text-main);
}

.btn-icon:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.3);
  transform: translateY(-1px);
}

.btn-secondary {
  padding: 0.5rem 1rem;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-glass);
  color: var(--color-text-main);
  font-size: 0.85rem;
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.3);
  transform: translateY(-1px);
}

.btn-hero {
  width: 100%;
  padding: 1rem 2rem;
  font-size: 1.1rem;
  font-weight: 800;
  letter-spacing: 1.5px;
  border-radius: 12px;
  background: linear-gradient(135deg, #00f3ff 0%, #00a8ff 100%);
  color: #050b14;
  box-shadow: 0 10px 25px rgba(0, 243, 255, 0.4);
}

.btn-hero:hover {
  transform: translateY(-2px);
  box-shadow: 0 15px 35px rgba(0, 243, 255, 0.6);
}

/* Modals */
.modal-overlay {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: auto;
  background: rgba(4, 7, 13, 0.88);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  animation: fadeIn 0.25s ease-out;
}

.modal-overlay.hidden {
  display: none !important;
}

.modal-card {
  width: 90%;
  max-width: 560px;
  padding: 2.8rem 2.5rem;
  background: var(--bg-panel);
  border: 1px solid var(--border-glass);
  border-radius: 24px;
  box-shadow: var(--glass-shadow);
  animation: slideDown 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-description {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.5;
  margin-bottom: 1.5rem;
}

.vertical-stack {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.modal-badge {
  display: inline-block;
  padding: 4px 12px;
  font-family: var(--font-family-mono);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--color-cyan);
  background: rgba(0, 243, 255, 0.1);
  border: 1px solid rgba(0, 243, 255, 0.3);
  border-radius: 20px;
  margin-bottom: 0.85rem;
}

/* Level Grid */
.level-select-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.75rem;
  margin-top: 1rem;
}

.level-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1rem 0.5rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-glass);
  border-radius: 14px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.level-card:hover:not(.locked) {
  background: rgba(0, 243, 255, 0.15);
  border-color: var(--color-cyan);
  transform: translateY(-2px);
}

.level-card.locked {
  opacity: 0.4;
  cursor: not-allowed;
  border-color: rgba(255, 255, 255, 0.05);
}

.level-num {
  font-family: var(--font-family-mono);
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--color-cyan);
}

.level-name {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--color-text-muted);
  margin-top: 4px;
  text-align: center;
}

.text-center {
  text-align: center;
}

@keyframes fadeIn {
  from { opacity: 0; transform: scale(0.98); }
  to { opacity: 1; transform: scale(1); }
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Speedrun High-Precision Timer Styling */
.victory-time-box {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin: 1.5rem 0;
  padding: 1rem;
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid var(--border-glass);
  border-radius: 12px;
}

.time-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.time-stat .label {
  font-family: var(--font-family-mono);
  font-size: 0.65rem;
  letter-spacing: 1.5px;
  color: var(--color-text-muted);
}

.time-stat .value {
  font-family: var(--font-family-mono);
  font-size: 1.25rem;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}

.time-stat .value.cyan {
  color: var(--color-cyan);
  text-shadow: 0 0 10px rgba(0, 243, 255, 0.4);
}

.time-stat .value.gold {
  color: var(--color-amber);
  text-shadow: 0 0 10px rgba(255, 183, 0, 0.4);
}

.modal-badge.gold {
  background: rgba(255, 183, 0, 0.15);
  color: var(--color-amber);
  border-color: var(--color-amber);
  box-shadow: 0 0 15px rgba(255, 183, 0, 0.3);
}

/* Volume Control & Main Menu Styles */
.volume-box {
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(0, 0, 0, 0.3);
  padding: 4px 10px;
  border-radius: 20px;
  border: 1px solid var(--border-glass);
}

.volume-range {
  -webkit-appearance: none;
  appearance: none;
  width: 80px;
  height: 4px;
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.2);
  outline: none;
  cursor: pointer;
}

.volume-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-cyan);
  box-shadow: 0 0 8px var(--color-cyan);
  cursor: pointer;
  transition: transform 0.15s ease;
}

.volume-range::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

.menu-volume-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 1.2rem;
  padding: 1rem 1.4rem;
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid var(--border-glass);
  border-radius: 14px;
}

.volume-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.menu-volume-card .label {
  font-family: var(--font-family-mono);
  font-size: 0.75rem;
  letter-spacing: 1.5px;
  color: var(--color-cyan);
}

.menu-volume-card .val-text {
  font-family: var(--font-family-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-text-main);
  font-variant-numeric: tabular-nums;
}

.volume-range.full-width {
  width: 100%;
  height: 6px;
}

.main-menu-title {
  font-size: 2.6rem;
  font-weight: 800;
  letter-spacing: 3px;
  color: #00f3ff;
  text-shadow: 0 0 20px rgba(0, 243, 255, 0.6), 0 0 40px rgba(0, 243, 255, 0.3);
  margin: 0.8rem 0 0.4rem 0;
}