/* ═══════════════════════════════════
   OCEAN POLLUTION SIMULATOR - STYLES
   ═══════════════════════════════════ */

:root {
  --primary: #00e5ff;
  --danger: #ff1744;
  --success: #00e676;
  --warning: #ffab00;
  --bg-dark: rgba(10, 15, 30, 0.85);
  --bg-glass: rgba(10, 20, 40, 0.6);
  --border-glow: rgba(0, 229, 255, 0.3);
  --font-display: 'Orbitron', sans-serif;
  --font-body: 'Inter', sans-serif;
}

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

body {
  overflow: hidden;
  background: #000;
  font-family: var(--font-body);
  color: #e0e8f0;
}

/* ── Loading Screen ── */
#loading-screen {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #0a0e1a 0%, #0d1b2a 50%, #1b2838 100%);
  transition: opacity 0.8s ease, visibility 0.8s ease;
}

#loading-screen.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

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

.loader-content h1 {
  font-family: var(--font-display);
  font-size: 1.8rem;
  color: var(--primary);
  margin-top: 30px;
  text-shadow: 0 0 20px rgba(0, 229, 255, 0.5);
}

.loader-content p {
  margin-top: 12px;
  font-size: 0.9rem;
  color: #7a8fa6;
  letter-spacing: 2px;
  text-transform: uppercase;
}

.loader-ring {
  width: 80px;
  height: 80px;
  margin: 0 auto;
  border: 4px solid rgba(0, 229, 255, 0.15);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ── Canvas ── */
#simulation-canvas {
  display: block;
  width: 100vw;
  height: 100vh;
}

/* ── HUD Overlay ── */
#hud {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 10;
}

#hud > * {
  pointer-events: auto;
}

/* Top Bar */
#hud-top {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  padding: 16px 30px;
  background: linear-gradient(180deg, rgba(5, 10, 20, 0.8) 0%, transparent 100%);
}

#hud-title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: 2px;
  text-transform: uppercase;
  text-shadow: 0 0 15px rgba(0, 229, 255, 0.4);
}

/* Alert Panel */
#alert-panel {
  position: absolute;
  top: 70px;
  right: 20px;
  width: 300px;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-glow);
  border-radius: 16px;
  padding: 20px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4), inset 0 1px 0 rgba(255,255,255,0.05);
}

#alert-indicator {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 18px;
  padding-bottom: 16px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

#alert-light {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 16px var(--success), 0 0 40px rgba(0, 230, 118, 0.3);
  transition: background 0.5s ease, box-shadow 0.5s ease;
  flex-shrink: 0;
}

#alert-light.red {
  background: var(--danger);
  box-shadow: 0 0 16px var(--danger), 0 0 40px rgba(255, 23, 68, 0.4);
  animation: pulse-red 1s ease-in-out infinite;
}

@keyframes pulse-red {
  0%, 100% { box-shadow: 0 0 16px var(--danger), 0 0 40px rgba(255, 23, 68, 0.3); }
  50% { box-shadow: 0 0 24px var(--danger), 0 0 60px rgba(255, 23, 68, 0.6); }
}

#alert-status {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 2px;
}

#alert-status.danger {
  color: var(--danger);
}

/* Pollution Bar */
#pollution-bar-container {
  margin-bottom: 16px;
}

#pollution-bar-container label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: #7a8fa6;
  display: block;
  margin-bottom: 8px;
}

#pollution-bar {
  width: 100%;
  height: 8px;
  background: rgba(255,255,255,0.08);
  border-radius: 4px;
  overflow: hidden;
}

#pollution-fill {
  width: 0%;
  height: 100%;
  border-radius: 4px;
  background: linear-gradient(90deg, var(--success), var(--warning), var(--danger));
  transition: width 0.3s ease;
}

#pollution-percent {
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--primary);
  display: block;
  text-align: right;
  margin-top: 4px;
}

/* Stats */
#stats {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.stat-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.stat-label {
  font-size: 0.75rem;
  color: #7a8fa6;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.stat-value {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 1px;
}

.stat-value.good { color: var(--success); }
.stat-value.warning { color: var(--warning); }
.stat-value.danger { color: var(--danger); }

/* Control Buttons */
#controls-panel {
  position: absolute;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 12px;
}

.control-btn {
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  padding: 12px 24px;
  border: 1px solid var(--border-glow);
  border-radius: 10px;
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  color: var(--primary);
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 4px 16px rgba(0,0,0,0.3);
}

.control-btn:hover {
  background: rgba(0, 229, 255, 0.15);
  border-color: var(--primary);
  box-shadow: 0 0 20px rgba(0, 229, 255, 0.2);
  transform: translateY(-2px);
}

.control-btn.danger {
  border-color: rgba(255, 23, 68, 0.4);
  color: var(--danger);
}

.control-btn.danger:hover {
  background: rgba(255, 23, 68, 0.15);
  border-color: var(--danger);
  box-shadow: 0 0 20px rgba(255, 23, 68, 0.25);
}

/* Responsive */
@media (max-width: 768px) {
  #alert-panel {
    width: 240px;
    padding: 14px;
    top: 60px;
    right: 10px;
  }

  #hud-title {
    font-size: 0.8rem;
  }

  .control-btn {
    padding: 10px 16px;
    font-size: 0.65rem;
  }
}