/* ==============================================================================
   Underwater Treasure Hunt — High-End Glassmorphic Design System
   ============================================================================== */

:root {
  --color-bg-deep: #020815;
  --color-bg-abyss: #061329;
  --color-bg-surface: rgba(8, 26, 56, 0.72);
  --color-border-glass: rgba(0, 245, 212, 0.22);
  --color-border-glow: rgba(0, 245, 212, 0.45);
  
  --color-cyan: #00b4d8;
  --color-neon-teal: #00f5d4;
  --color-gold: #ffd166;
  --color-coral-red: #ff3366;
  --color-emerald: #06d6a0;
  --color-amber: #f77f00;
  --color-purple: #7209b7;
  --color-white: #ffffff;
  --color-text-muted: #94a3b8;

  --font-main: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-pill: 9999px;

  --shadow-glow-cyan: 0 0 25px rgba(0, 245, 212, 0.35);
  --shadow-glow-gold: 0 0 25px rgba(255, 209, 102, 0.35);
  --shadow-glow-red: 0 0 25px rgba(255, 51, 102, 0.45);
  --shadow-panel: 0 20px 45px rgba(2, 8, 21, 0.75), inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

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

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background-color: var(--color-bg-deep);
  color: #f8fafc;
  font-family: var(--font-main);
  -webkit-font-smoothing: antialiased;
}

/* Primary Game Canvas */
#game-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 1;
  display: block;
  cursor: crosshair;
}

/* ==============================================================================
   Webcam PIP Tracker Component
   ============================================================================== */
.camera-pip-container {
  position: fixed;
  top: 20px;
  right: 20px;
  width: 220px;
  background: var(--color-bg-surface);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--color-border-glass);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-panel);
  z-index: 50;
  overflow: hidden;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.camera-pip-container.minimized {
  width: 180px;
  height: 40px;
}

.camera-pip-container.minimized .pip-video-wrapper,
.camera-pip-container.minimized .pip-controls {
  display: none;
}

.pip-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  background: rgba(0, 0, 0, 0.3);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.pip-title {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--color-neon-teal);
  display: flex;
  align-items: center;
  gap: 6px;
}

.pip-title .dot {
  width: 6px;
  height: 6px;
  background: var(--color-emerald);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--color-emerald);
  animation: pulse 1.8s infinite ease-in-out;
}

.pip-tool-btn {
  background: transparent;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  font-size: 14px;
  padding: 0 4px;
  transition: color 0.2s;
}

.pip-tool-btn:hover {
  color: var(--color-white);
}

.pip-video-wrapper {
  position: relative;
  width: 100%;
  height: 140px;
  background: #000;
}

#webcam-video {
  display: none;
}

#pip-canvas {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scaleX(-1); /* Mirror camera */
}

.pip-gesture-badge {
  position: absolute;
  bottom: 8px;
  left: 8px;
  right: 8px;
  padding: 4px 8px;
  font-size: 10px;
  font-weight: 700;
  text-align: center;
  background: rgba(4, 18, 41, 0.85);
  border: 1px solid var(--color-neon-teal);
  color: var(--color-neon-teal);
  border-radius: var(--radius-sm);
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.pip-controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  padding: 8px;
  background: rgba(0, 0, 0, 0.2);
}

.pip-btn {
  padding: 6px;
  font-size: 10px;
  font-weight: 600;
  font-family: inherit;
  color: #e2e8f0;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s;
}

.pip-btn:hover {
  background: rgba(0, 245, 212, 0.2);
  border-color: var(--color-neon-teal);
  color: var(--color-white);
}

/* ==============================================================================
   In-Game HUD Overlay
   ============================================================================== */
.hud-layer {
  position: fixed;
  inset: 0;
  z-index: 10;
  pointer-events: none;
  padding: 24px 32px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.hud-panel {
  pointer-events: auto;
  background: var(--color-bg-surface);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--color-border-glass);
  box-shadow: var(--shadow-panel);
  border-radius: var(--radius-md);
  padding: 12px 18px;
}

/* Oxygen Vitals Bar */
.hud-vitals {
  position: absolute;
  top: 24px;
  left: 32px;
  width: 250px;
}

.vital-label-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.8px;
  margin-bottom: 6px;
}

.vital-title {
  color: var(--color-cyan);
}

.vital-value {
  color: var(--color-white);
  font-size: 14px;
}

.progress-bar-track {
  width: 100%;
  height: 10px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-pill);
  overflow: hidden;
  position: relative;
}

.progress-bar-fill {
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, #00b4d8, #00f5d4);
  border-radius: var(--radius-pill);
  box-shadow: 0 0 12px var(--color-neon-teal);
  transition: width 0.2s ease, background 0.3s ease;
}

.progress-bar-fill.critical {
  background: linear-gradient(90deg, #ff3366, #ff758c);
  box-shadow: 0 0 15px var(--color-coral-red);
  animation: pulse-danger 0.8s infinite alternate;
}

.vital-subtext {
  font-size: 10px;
  color: var(--color-text-muted);
  margin-top: 4px;
}

/* Objective Center Panel */
.hud-objective {
  position: absolute;
  top: 24px;
  left: 50%;
  transform: translateX(-50%);
  text-align: center;
  min-width: 320px;
}

.hud-level-name {
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 1.5px;
  color: var(--color-neon-teal);
  text-transform: uppercase;
  margin-bottom: 6px;
}

.hud-target-row {
  display: flex;
  justify-content: center;
  gap: 14px;
}

.target-chip {
  font-size: 13px;
  font-weight: 600;
  background: rgba(255, 255, 255, 0.06);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.timer-chip {
  color: var(--color-gold);
}

/* Score & Multiplier Right Panel */
.hud-score-panel {
  position: absolute;
  top: 24px;
  right: 260px; /* Leave space for PIP */
  text-align: right;
  min-width: 190px;
}

.score-row {
  display: flex;
  flex-direction: column;
}

.score-label {
  font-size: 10px;
  letter-spacing: 1px;
  font-weight: 700;
  color: var(--color-text-muted);
}

.score-val {
  font-size: 24px;
  font-weight: 900;
  color: var(--color-gold);
  letter-spacing: 0.5px;
  text-shadow: 0 0 12px rgba(255, 209, 102, 0.4);
}

.multiplier-row {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 4px;
}

.combo-badge, .sonar-badge {
  font-size: 11px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: var(--radius-pill);
}

.combo-badge {
  background: rgba(255, 209, 102, 0.15);
  border: 1px solid var(--color-gold);
  color: var(--color-gold);
}

.sonar-badge {
  background: rgba(0, 180, 216, 0.15);
  border: 1px solid var(--color-cyan);
  color: var(--color-cyan);
}

/* Bottom Left: Live Gesture Feedback Pill */
.hud-bottom-left {
  position: absolute;
  bottom: 24px;
  left: 32px;
  pointer-events: auto;
}

.active-gesture-pill {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--color-bg-surface);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--color-neon-teal);
  border-radius: var(--radius-pill);
  padding: 8px 18px;
  box-shadow: var(--shadow-glow-cyan);
  transition: all 0.25s ease;
}

.active-gesture-pill.highlight {
  border-color: var(--color-gold);
  box-shadow: var(--shadow-glow-gold);
}

.active-gesture-pill.danger {
  border-color: var(--color-coral-red);
  box-shadow: var(--shadow-glow-red);
}

.gesture-icon {
  font-size: 22px;
}

.gesture-texts {
  display: flex;
  flex-direction: column;
}

.gesture-state-name {
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.8px;
  color: var(--color-neon-teal);
  text-transform: uppercase;
}

.gesture-state-hint {
  font-size: 11px;
  color: var(--color-text-muted);
}

/* Bottom Right: Quick Utility Buttons */
.hud-bottom-right {
  position: absolute;
  bottom: 24px;
  right: 32px;
  display: flex;
  gap: 10px;
  pointer-events: auto;
}

.hud-icon-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-bg-surface);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #fff;
  font-size: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: var(--shadow-panel);
}

.hud-icon-btn:hover {
  border-color: var(--color-neon-teal);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow-cyan);
}

/* Carrying Relic Indicator */
.carry-pill {
  position: absolute;
  top: 100px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 209, 102, 0.2);
  border: 1px solid var(--color-gold);
  border-radius: var(--radius-pill);
  padding: 8px 18px;
  font-size: 13px;
  font-weight: 700;
  color: var(--color-gold);
  box-shadow: var(--shadow-glow-gold);
  animation: bounce 1.5s infinite;
}

/* ==============================================================================
   UI Modals & Screens System
   ============================================================================== */
.modal-layer {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(circle at center, rgba(3, 14, 38, 0.65) 0%, rgba(2, 8, 21, 0.94) 100%);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.glass-modal {
  position: relative;
  background: var(--color-bg-surface);
  border: 1px solid var(--color-border-glow);
  box-shadow: var(--shadow-panel), var(--shadow-glow-cyan);
  border-radius: var(--radius-lg);
  padding: 40px;
  color: #fff;
  text-align: center;
  max-width: 90vw;
  animation: modalEnter 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

.menu-modal {
  width: 520px;
}

.modal-wide {
  width: 860px;
  max-height: 85vh;
  overflow-y: auto;
}

.modal-compact {
  width: 440px;
}

.brand-badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 2px;
  color: var(--color-neon-teal);
  background: rgba(0, 245, 212, 0.1);
  border: 1px solid rgba(0, 245, 212, 0.3);
  padding: 4px 14px;
  border-radius: var(--radius-pill);
  margin-bottom: 16px;
}

.game-title {
  font-size: 40px;
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: 1px;
  margin-bottom: 10px;
}

.highlight-cyan {
  color: var(--color-neon-teal);
  text-shadow: 0 0 20px rgba(0, 245, 212, 0.6);
}

.highlight-gold {
  color: var(--color-gold);
}

.game-subtitle {
  font-size: 14px;
  color: var(--color-text-muted);
  margin-bottom: 30px;
  line-height: 1.5;
}

/* Action Buttons */
.menu-action-stack {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 26px;
}

button {
  font-family: inherit;
}

.btn-primary {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 16px 28px;
  background: linear-gradient(135deg, #00b4d8 0%, #00f5d4 100%);
  color: #020815;
  font-size: 16px;
  font-weight: 800;
  letter-spacing: 1px;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: 0 10px 25px rgba(0, 245, 212, 0.35);
}

.btn-primary:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 15px 30px rgba(0, 245, 212, 0.55);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 24px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: #f1f5f9;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.5px;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.btn-secondary:hover {
  background: rgba(0, 245, 212, 0.15);
  border-color: var(--color-neon-teal);
  color: #fff;
  transform: translateY(-2px);
}

.btn-back {
  padding: 10px 22px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: var(--color-text-muted);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  transition: all 0.2s;
}

.btn-back:hover {
  color: #fff;
  border-color: var(--color-neon-teal);
}

.menu-footer-tips {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 11px;
  color: var(--color-text-muted);
  line-height: 1.5;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 18px;
}

.fallback-note {
  color: var(--color-neon-teal);
  font-weight: 600;
}

/* Cards Grids for Levels & Challenges */
.modal-header {
  margin-bottom: 24px;
}

.modal-header h2 {
  font-size: 28px;
  font-weight: 800;
  color: var(--color-neon-teal);
  letter-spacing: 0.5px;
  margin-bottom: 6px;
}

.modal-header p {
  color: var(--color-text-muted);
  font-size: 14px;
}

.level-cards-grid, .challenge-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
  margin-bottom: 24px;
}

.level-card, .challenge-card {
  background: rgba(5, 17, 39, 0.8);
  border: 1px solid rgba(0, 245, 212, 0.15);
  border-radius: var(--radius-md);
  padding: 20px;
  text-align: left;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  overflow: hidden;
}

.level-card:hover, .challenge-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-neon-teal);
  box-shadow: 0 10px 25px rgba(0, 245, 212, 0.25);
  background: rgba(10, 31, 68, 0.85);
}

.card-num {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 1px;
  color: var(--color-cyan);
  margin-bottom: 6px;
}

.card-title {
  font-size: 18px;
  font-weight: 800;
  margin-bottom: 6px;
}

.card-desc {
  font-size: 12px;
  color: var(--color-text-muted);
  line-height: 1.4;
  margin-bottom: 14px;
}

.card-meta-row {
  display: flex;
  gap: 12px;
  font-size: 11px;
  font-weight: 600;
  color: var(--color-gold);
}

/* How to Play Guide Grid */
.guide-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 24px;
  text-align: left;
}

.guide-card {
  background: rgba(5, 17, 39, 0.8);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
  padding: 18px;
}

.guide-badge {
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 1px;
  color: var(--color-neon-teal);
  margin-bottom: 8px;
}

.guide-icon {
  font-size: 32px;
  margin-bottom: 10px;
}

.guide-card h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 6px;
}

.guide-card p {
  font-size: 12px;
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* Calibration / Webcam Check */
.calib-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 24px;
  text-align: left;
}

.calib-video-box {
  position: relative;
  width: 100%;
  height: 280px;
  background: #000;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border-glow);
}

#calib-canvas {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scaleX(-1);
}

.calib-status {
  position: absolute;
  top: 12px;
  left: 12px;
  background: rgba(0, 0, 0, 0.7);
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  font-size: 11px;
  font-weight: 700;
  color: var(--color-neon-teal);
  border: 1px solid var(--color-neon-teal);
}

.calib-checklist h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--color-cyan);
}

.calib-item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 13px;
  padding: 10px 14px;
  background: rgba(255, 255, 255, 0.04);
  border-radius: var(--radius-sm);
  margin-bottom: 8px;
  border: 1px solid rgba(255, 255, 255, 0.06);
  transition: all 0.25s;
}

.calib-item.active {
  background: rgba(6, 214, 160, 0.15);
  border-color: var(--color-emerald);
  color: var(--color-emerald);
  font-weight: 700;
}

/* Modals Compact (Pause, Over, Win) */
.pause-button-col {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 24px;
}

.summary-card {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin: 18px 0;
  text-align: left;
}

.summary-line {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  margin-bottom: 8px;
}

.summary-line:last-child {
  margin-bottom: 0;
}

.celebration-badge {
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 1px;
  color: var(--color-emerald);
  background: rgba(6, 214, 160, 0.12);
  border: 1px solid var(--color-emerald);
  padding: 4px 14px;
  border-radius: var(--radius-pill);
  display: inline-block;
  margin-bottom: 12px;
}

.danger-badge {
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 1px;
  color: var(--color-coral-red);
  background: rgba(255, 51, 102, 0.15);
  border: 1px solid var(--color-coral-red);
  padding: 4px 14px;
  border-radius: var(--radius-pill);
  display: inline-block;
  margin-bottom: 12px;
}

.stars-row {
  font-size: 26px;
  margin: 10px 0;
  letter-spacing: 4px;
}

.victory-crown {
  font-size: 48px;
  margin-bottom: 10px;
  animation: float 2.5s infinite ease-in-out;
}

/* Keyframe Animations */
@keyframes modalEnter {
  from {
    opacity: 0;
    transform: scale(0.94) translateY(12px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.85); }
}

@keyframes pulse-danger {
  from { filter: drop-shadow(0 0 4px var(--color-coral-red)); }
  to { filter: drop-shadow(0 0 16px var(--color-coral-red)); }
}

@keyframes bounce {
  0%, 100% { transform: translate(-50%, 0); }
  50% { transform: translate(-50%, -6px); }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

/* Responsive adjustments */
@media (max-width: 900px) {
  .guide-grid {
    grid-template-columns: 1fr;
  }
  .calib-layout {
    grid-template-columns: 1fr;
  }
  .hud-vitals {
    width: 180px;
    left: 16px;
    top: 16px;
  }
  .hud-score-panel {
    right: 16px;
    top: 70px;
  }
}