:root {
    --primary: #ff4444;
    --primary-dim: rgba(255, 68, 68, 0.3);
    --secondary: #4caf50;
    --accent: #00ffff;
    --accent-dim: rgba(0, 255, 255, 0.2);
    --dark: rgba(10, 10, 14, 0.85);
    --dark-border: rgba(255, 255, 255, 0.15);
    --font-main: 'Rajdhani', 'Segoe UI', sans-serif;
    --glass: rgba(255, 255, 255, 0.05);
}

body {
    margin: 0;
    padding: 0;
    overflow: hidden;
    font-family: var(--font-main);
    user-select: none;
    background: #000;
    color: #fff;
}

canvas {
    display: block;
    width: 100vw;
    height: 100vh;
}

#game-ui {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

/* HUD Styling */
.hud-container {
    position: absolute;
    top: 20px;
    left: 20px;
    display: flex;
    flex-direction: column;
    gap: 15px;
    z-index: 10;
    pointer-events: none;
    transform-origin: top left;
    transform: skewX(-5deg); /* Slight sci-fi skew */
}

.hud-panel {
    background: var(--dark);
    backdrop-filter: blur(12px);
    padding: 15px 20px;
    border-radius: 4px;
    border-left: 3px solid var(--accent);
    border-top: 1px solid var(--dark-border);
    border-right: 1px solid var(--dark-border);
    border-bottom: 1px solid var(--dark-border);
    box-shadow: 0 4px 20px rgba(0,0,0,0.6), inset 0 0 20px rgba(0, 255, 255, 0.05);
    min-width: 280px;
    pointer-events: auto;
    position: relative;
    overflow: hidden;
}

.hud-panel::before {
    content: '';
    position: absolute;
    top: 0; left: 0; width: 100%; height: 2px;
    background: linear-gradient(90deg, var(--accent), transparent);
    opacity: 0.5;
}

.stats-panel {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.stat-row {
    display: flex;
    align-items: center;
    gap: 12px;
}

.stat-icon {
    font-size: 1.2rem;
    width: 24px;
    text-align: center;
    filter: drop-shadow(0 0 5px rgba(255,255,255,0.3));
    transform: skewX(5deg); /* Counter-skew icon */
}

.bar-container {
    flex: 1;
    height: 8px;
    background: rgba(0,0,0,0.8);
    border-radius: 2px;
    overflow: hidden;
    border: 1px solid rgba(255,255,255,0.1);
    position: relative;
}

.bar-fill {
    height: 100%;
    width: 100%;
    transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

/* Striped pattern for bars */
.bar-fill::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background-image: linear-gradient(
        45deg, 
        rgba(255,255,255,0.15) 25%, 
        transparent 25%, 
        transparent 50%, 
        rgba(255,255,255,0.15) 50%, 
        rgba(255,255,255,0.15) 75%, 
        transparent 75%, 
        transparent
    );
    background-size: 10px 10px;
}

.hp-fill { background: linear-gradient(90deg, #d32f2f, #ff5252); box-shadow: 0 0 10px rgba(255, 82, 82, 0.5); }
.truck-fill { background: linear-gradient(90deg, #f57c00, #ff9800); box-shadow: 0 0 10px rgba(255, 152, 0, 0.5); }
.gas-fill { background: linear-gradient(90deg, #388e3c, #4caf50); box-shadow: 0 0 10px rgba(76, 175, 80, 0.5); }

.stat-value {
    font-weight: 700;
    font-size: 1.2rem;
    min-width: 45px;
    text-align: right;
    font-variant-numeric: tabular-nums;
    text-shadow: 0 0 5px rgba(0,0,0,0.8);
    color: #fff;
    transform: skewX(5deg);
}

.info-panel {
    display: flex;
    justify-content: space-between;
    gap: 8px;
}

.info-item {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--glass);
    padding: 8px 12px;
    border-radius: 2px;
    flex: 1;
    justify-content: center;
    border: 1px solid rgba(255,255,255,0.05);
    transition: all 0.2s;
}

.info-item:hover {
    background: rgba(255,255,255,0.1);
    border-color: var(--accent-dim);
    box-shadow: 0 0 10px var(--accent-dim);
}

.info-value {
    font-weight: 700;
    color: var(--accent);
    font-size: 1.1rem;
    transform: skewX(5deg);
    text-shadow: 0 0 5px var(--accent-dim);
}

/* Panels (Game Over etc) */
.panel {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(15, 18, 25, 0.98);
    padding: 50px;
    border-radius: 4px;
    border: 1px solid var(--accent);
    color: #fff;
    text-align: center;
    pointer-events: auto;
    min-width: 450px;
    box-shadow: 0 0 100px rgba(0,0,0,0.9), 0 0 20px var(--accent-dim);
    backdrop-filter: blur(20px);
}

.hidden {
    display: none !important;
}

h2 {
    color: var(--primary);
    margin-top: 0;
    font-size: 3rem;
    text-transform: uppercase;
    letter-spacing: 4px;
    text-shadow: 0 0 30px rgba(255, 68, 68, 0.6);
    margin-bottom: 20px;
    font-weight: 800;
}

/* Universal Button Style (used in game) */
button {
    background: linear-gradient(to right, #333, #444);
    color: var(--accent);
    border: 1px solid var(--accent);
    padding: 15px 40px;
    cursor: pointer;
    font-size: 1.2rem;
    transition: all 0.2s;
    border-radius: 2px;
    font-family: var(--font-main);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-top: 30px;
    position: relative;
    overflow: hidden;
}

button:hover {
    background: var(--accent);
    color: #000;
    box-shadow: 0 0 20px var(--accent);
    font-weight: bold;
}

button:active {
    transform: scale(0.98);
}

/* Menu Button Specifics (overriding generic button if needed, or replacing) */
.menu-btn {
    background: linear-gradient(45deg, #3e2723, #5d4037);
    border: 2px solid #8d6e63;
    color: #fff;
    padding: 15px 60px;
    font-size: 24px;
    font-family: 'Rajdhani', sans-serif;
    font-weight: bold;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 2px;
    transition: all 0.3s;
    box-shadow: 0 0 15px rgba(0,0,0,0.5);
    position: relative;
    overflow: hidden;
    width: 300px;
    margin-top: 0; /* Override generic margin */
}

.menu-btn:hover {
    background: #ff5555;
    border-color: #ff0000;
    transform: scale(1.05);
    box-shadow: 0 0 30px rgba(255, 85, 85, 0.6);
    color: #000;
}

/* Message Log */
#message-log {
    position: absolute;
    bottom: 140px;
    left: 20px;
    display: flex;
    flex-direction: column;
    gap: 6px;
    pointer-events: none;
    max-height: 350px;
    overflow: hidden;
    mask-image: linear-gradient(to bottom, transparent, black 10%);
}

.log-msg {
    background: linear-gradient(90deg, rgba(0, 0, 0, 0.9), transparent);
    color: #eee;
    padding: 6px 15px;
    border-left: 3px solid var(--primary);
    animation: slideIn 0.3s ease-out, fadeOut 5s 4s forwards;
    font-size: 0.9rem;
    font-family: 'Consolas', monospace;
    text-shadow: 1px 1px 2px black;
    backdrop-filter: blur(2px);
    margin-bottom: 2px;
}

@keyframes slideIn {
    from { transform: translateX(-30px); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

@keyframes fadeOut {
    to { opacity: 0; visibility: hidden; margin-top: -35px; } /* Collapse height */
}

/* Crosshair */
#crosshair {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    pointer-events: none;
}

.crosshair-dot {
    width: 6px;
    height: 6px;
    background-color: var(--accent);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--accent), 0 0 2px #fff;
    border: 1px solid rgba(0,0,0,0.5);
}

/* Interaction Prompt */
#interaction-prompt {
    position: absolute;
    top: 65%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(0, 0, 0, 0.85);
    color: var(--accent);
    padding: 12px 25px;
    border-radius: 4px;
    font-size: 1.2rem;
    pointer-events: none;
    border: 1px solid var(--accent);
    box-shadow: 0 0 20px rgba(0, 255, 255, 0.2);
    text-transform: uppercase;
    letter-spacing: 2px;
    font-weight: bold;
    animation: promptFloat 2s ease-in-out infinite;
    backdrop-filter: blur(5px);
}

#vehicle-prompt {
    position: absolute;
    top: 30%; /* Higher up for vehicle prompt */
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(0, 0, 0, 0.6);
    color: #0f0;
    padding: 10px 20px;
    border-radius: 4px;
    font-size: 1.2rem;
    pointer-events: none;
    border: 1px solid #0f0;
    box-shadow: 0 0 15px rgba(0, 255, 0, 0.2);
    font-weight: bold;
    backdrop-filter: blur(3px);
    text-align: center;
}

@keyframes promptFloat {
    0%, 100% { transform: translate(-50%, -50%) translateY(0); }
    50% { transform: translate(-50%, -50%) translateY(-5px); }
}

/* Controls Hint */
#controls-hint {
    position: absolute;
    bottom: 0;
    width: 100%;
    text-align: center;
    color: rgba(255,255,255,0.7);
    font-size: 0.9rem;
    text-shadow: 0 2px 4px black;
    padding: 15px 0 15px;
    background: linear-gradient(to top, rgba(0,0,0,1), transparent);
    letter-spacing: 1.5px;
    font-family: monospace;
    pointer-events: none;
}

/* Turret Overlay */
#turret-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    background: radial-gradient(circle, transparent 40%, rgba(0, 50, 0, 0.2) 80%, rgba(0, 20, 0, 0.6) 100%);
    box-shadow: inset 0 0 100px rgba(0,255,0,0.1);
}

.turret-text {
    position: absolute;
    top: 20%;
    width: 100%;
    text-align: center;
    color: #0f0;
    font-size: 1.5rem;
    font-family: 'Consolas', monospace;
    text-shadow: 0 0 10px #0f0;
    animation: blink 1s infinite;
    background: rgba(0,0,0,0.5);
    padding: 10px 0;
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* Inventory CSS (Moved from JS) */
#inventory-panel {
    position: absolute; 
    top: 50%; 
    left: 50%; 
    transform: translate(-50%, -50%);
    width: 320px; 
    height: 400px; 
    background: rgba(15, 18, 25, 0.98); 
    backdrop-filter: blur(20px);
    border: 1px solid var(--dark-border); 
    border-radius: 4px;
    color: white; 
    padding: 15px; 
    display: none; 
    z-index: 2000; 
    font-family: var(--font-main); 
    flex-direction: column;
    box-shadow: 0 0 50px rgba(0,0,0,0.8), inset 0 0 0 1px rgba(255,255,255,0.05);
}

#inventory-header { 
    font-size: 20px; 
    font-weight: 800; 
    margin-bottom: 15px; 
    border-bottom: 2px solid var(--primary); 
    padding-bottom: 10px;
    display: flex; 
    justify-content: space-between;
    text-shadow: 0 0 15px rgba(255, 68, 68, 0.3);
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--primary);
}

#inventory-grid { 
    display: grid; 
    grid-template-columns: repeat(3, 1fr); 
    gap: 10px; 
    overflow-y: auto; 
    flex: 1; 
    padding-right: 5px;
}

.inv-slot {
    aspect-ratio: 1; 
    background: rgba(255, 255, 255, 0.03); 
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    display: flex; 
    flex-direction: column; 
    align-items: center; 
    justify-content: center;
    cursor: pointer; 
    position: relative; 
    transition: all 0.2s;
}

.inv-slot:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--accent);
    box-shadow: 0 0 15px var(--accent-dim);
    transform: translateY(-2px);
}

.inv-icon { 
    font-size: 36px; 
    margin-bottom: 5px; 
    filter: drop-shadow(0 4px 4px rgba(0,0,0,0.5));
}

.inv-count { 
    position: absolute; 
    bottom: 4px; 
    right: 6px; 
    font-size: 14px; 
    color: var(--accent); 
    font-weight: bold; 
    text-shadow: 0 0 5px black; 
    font-family: monospace;
}

/* Context Menu */
#ctx-menu {
    position: absolute; 
    background: #222; 
    border: 1px solid #444; 
    display: none; 
    z-index: 3000; 
    min-width: 120px;
    box-shadow: 4px 4px 10px rgba(0,0,0,0.5);
    border-radius: 2px;
}

.ctx-item { 
    padding: 10px 15px; 
    cursor: pointer; 
    color: #ccc; 
    font-size: 14px; 
    transition: background 0.2s;
}

.ctx-item:hover { 
    background: var(--primary); 
    color: white; 
}