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

:root {
    --bg-dark: #0a0a12;
    --bg-panel: rgba(12, 14, 26, 0.92);
    --accent-cyan: #00f5ff;
    --accent-magenta: #ff00aa;
    --accent-gold: #ffd700;
    --text-primary: #e8e8ff;
    --text-dim: #6a6a8a;
    --border-glow: rgba(0, 245, 255, 0.3);
    --star-yellow: #fff4d4;
    --planet-blue: #4a9eff;
    --planet-green: #4aff9e;
    --asteroid-gray: #8a8a9a;
}

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

#canvas-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

#gameCanvas {
    display: block;
    cursor: crosshair;
}

#particleCanvas {
    position: absolute;
    top: 0;
    left: 0;
    pointer-events: none;
    z-index: 2;
}

#background-canvas {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 0;
    pointer-events: none;
}

/* Control Panel */
#control-panel {
    position: fixed;
    top: 20px;
    left: 20px;
    z-index: 100;
    background: var(--bg-panel);
    border: 1px solid var(--border-glow);
    border-radius: 12px;
    padding: 20px;
    min-width: 260px;
    backdrop-filter: blur(10px);
    box-shadow: 0 0 40px rgba(0, 245, 255, 0.1),
                inset 0 0 20px rgba(0, 245, 255, 0.02);
}

#control-panel h1 {
    font-family: 'Orbitron', sans-serif;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--accent-cyan);
    text-transform: uppercase;
    letter-spacing: 3px;
    margin-bottom: 20px;
    text-shadow: 0 0 20px var(--accent-cyan);
}

.panel-section {
    margin-bottom: 18px;
}

.panel-section h3 {
    font-size: 0.75rem;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 10px;
    font-weight: 500;
}

.body-buttons {
    display: flex;
    gap: 8px;
}

.body-btn {
    flex: 1;
    padding: 12px 8px;
    border: 1px solid transparent;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.03);
    color: var(--text-primary);
    font-family: 'Rajdhani', sans-serif;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.body-btn:hover {
    background: rgba(255, 255, 255, 0.08);
    transform: translateY(-2px);
}

.body-btn.active {
    border-color: var(--accent-cyan);
    background: rgba(0, 245, 255, 0.1);
    box-shadow: 0 0 20px rgba(0, 245, 255, 0.2);
}

.body-btn.star { --btn-color: var(--star-yellow); }
.body-btn.planet { --btn-color: var(--planet-blue); }
.body-btn.asteroid { --btn-color: var(--asteroid-gray); }

.body-btn.active.star { border-color: var(--star-yellow); background: rgba(255, 244, 212, 0.15); }
.body-btn.active.planet { border-color: var(--planet-blue); background: rgba(74, 158, 255, 0.15); }
.body-btn.active.asteroid { border-color: var(--asteroid-gray); background: rgba(138, 138, 154, 0.15); }

.body-indicator {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    display: inline-block;
    margin-right: 6px;
    vertical-align: middle;
}

.body-btn.star .body-indicator { background: var(--star-yellow); box-shadow: 0 0 10px var(--star-yellow); }
.body-btn.planet .body-indicator { background: var(--planet-blue); box-shadow: 0 0 10px var(--planet-blue); }
.body-btn.asteroid .body-indicator { background: var(--asteroid-gray); }

/* Slider styles */
.slider-container {
    display: flex;
    align-items: center;
    gap: 12px;
}

.slider-container input[type="range"] {
    flex: 1;
    -webkit-appearance: none;
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
    outline: none;
}

.slider-container input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    background: var(--accent-cyan);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 10px var(--accent-cyan);
    transition: all 0.2s ease;
}

.slider-container input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.slider-value {
    font-family: 'Orbitron', sans-serif;
    font-size: 0.8rem;
    color: var(--accent-cyan);
    min-width: 50px;
    text-align: right;
}

/* Simulation Controls */
.sim-controls {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.sim-btn {
    padding: 10px 16px;
    border: 1px solid var(--border-glow);
    border-radius: 6px;
    background: rgba(255, 255, 255, 0.03);
    color: var(--text-primary);
    font-family: 'Rajdhani', sans-serif;
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.sim-btn:hover {
    background: rgba(0, 245, 255, 0.1);
    border-color: var(--accent-cyan);
}

.sim-btn.active {
    background: var(--accent-cyan);
    color: var(--bg-dark);
    border-color: var(--accent-cyan);
}

.sim-btn.danger {
    border-color: rgba(255, 0, 100, 0.3);
}

.sim-btn.danger:hover {
    background: rgba(255, 0, 100, 0.2);
    border-color: var(--accent-magenta);
}

/* Speed Controls */
.speed-controls {
    display: flex;
    gap: 6px;
}

.speed-btn {
    flex: 1;
    padding: 8px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    background: rgba(255, 255, 255, 0.02);
    color: var(--text-dim);
    font-family: 'Orbitron', sans-serif;
    font-size: 0.65rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.speed-btn:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
}

.speed-btn.active {
    border-color: var(--accent-gold);
    color: var(--accent-gold);
    background: rgba(255, 215, 0, 0.1);
}

/* Info Panel */
#info-panel {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 100;
    background: var(--bg-panel);
    border: 1px solid var(--border-glow);
    border-radius: 12px;
    padding: 20px;
    min-width: 220px;
    backdrop-filter: blur(10px);
    box-shadow: 0 0 40px rgba(0, 245, 255, 0.1);
}

#info-panel h2 {
    font-family: 'Orbitron', sans-serif;
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--accent-magenta);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 15px;
    text-shadow: 0 0 15px var(--accent-magenta);
}

.info-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
    font-size: 0.85rem;
}

.info-label {
    color: var(--text-dim);
}

.info-value {
    font-family: 'Orbitron', sans-serif;
    font-size: 0.75rem;
    color: var(--text-primary);
}

#gpu-status {
    color: #00ff88;
    text-shadow: 0 0 10px #00ff88;
}

.lock-btn {
    width: 100%;
    margin-top: 12px;
    padding: 10px 16px;
    border: 1px solid rgba(255, 100, 100, 0.5);
    border-radius: 6px;
    background: rgba(255, 100, 100, 0.1);
    color: #ff6464;
    font-family: 'Rajdhani', sans-serif;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.lock-btn:hover {
    background: rgba(255, 100, 100, 0.2);
    border-color: #ff6464;
    box-shadow: 0 0 15px rgba(255, 100, 100, 0.3);
}

.lock-btn.locked {
    background: rgba(255, 100, 100, 0.3);
    border-color: #ff6464;
    color: #fff;
}

.info-divider {
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-glow), transparent);
    margin: 12px 0;
}

#selected-body-info {
    opacity: 0.5;
}

#selected-body-info.has-selection {
    opacity: 1;
}

/* Mode indicator */
.mode-indicator {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    background: rgba(255, 0, 170, 0.1);
    border: 1px solid rgba(255, 0, 170, 0.3);
    border-radius: 6px;
    margin-top: 10px;
}

.mode-indicator.hidden {
    display: none;
}

.mode-dot {
    width: 8px;
    height: 8px;
    background: var(--accent-magenta);
    border-radius: 50%;
    animation: pulse 1s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(0.8); }
}

.mode-text {
    font-size: 0.75rem;
    color: var(--accent-magenta);
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Instructions */
#instructions {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 100;
    background: var(--bg-panel);
    border: 1px solid var(--border-glow);
    border-radius: 8px;
    padding: 12px 24px;
    backdrop-filter: blur(10px);
    font-size: 0.8rem;
    color: var(--text-dim);
    text-align: center;
}

#instructions span {
    color: var(--accent-cyan);
    font-weight: 600;
}

/* Checkbox styling */
.checkbox-container {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
}

.checkbox-container input {
    display: none;
}

.custom-checkbox {
    width: 18px;
    height: 18px;
    border: 1px solid var(--border-glow);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.checkbox-container:hover .custom-checkbox {
    border-color: var(--accent-cyan);
}

.checkbox-container input:checked + .custom-checkbox {
    background: var(--accent-cyan);
    border-color: var(--accent-cyan);
}

.checkbox-container input:checked + .custom-checkbox::after {
    content: '✓';
    color: var(--bg-dark);
    font-size: 12px;
    font-weight: bold;
}

.checkbox-label {
    font-size: 0.85rem;
    color: var(--text-primary);
}

/* Auto-click settings */
.auto-click-settings {
    margin-top: 10px;
    padding: 10px;
    background: rgba(0, 255, 136, 0.05);
    border: 1px solid rgba(0, 255, 136, 0.2);
    border-radius: 6px;
}

.auto-click-settings.hidden {
    display: none;
}

.auto-click-settings h3 {
    font-size: 0.7rem;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 8px;
}

.mode-indicator.auto-click-active {
    background: rgba(0, 255, 136, 0.1);
    border-color: rgba(0, 255, 136, 0.3);
}

.mode-indicator.auto-click-active .mode-dot {
    background: #00ff88;
}

.mode-indicator.auto-click-active .mode-text {
    color: #00ff88;
}

.auto-dot {
    animation: pulse-fast 0.3s ease-in-out infinite;
}

@keyframes pulse-fast {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(0.6); }
}