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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
    transition: all 0.3s ease;
}

body.dark-mode {
    background: linear-gradient(135deg, #2d3748 0%, #4a5568 100%);
    color: #e2e8f0;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 30px;
    color: white;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

header p {
    font-size: 1.2rem;
    opacity: 0.9;
}

.main-content {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 30px;
    margin-bottom: 30px;
}

@media (max-width: 768px) {
    .main-content {
        grid-template-columns: 1fr;
        gap: 20px;
    }
}

.controls-panel {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    padding: 25px;
    backdrop-filter: blur(10px);
    box-shadow: 0 8px 32px rgba(0,0,0,0.1);
    height: fit-content;
    transition: all 0.3s ease;
}

body.dark-mode .controls-panel {
    background: rgba(45, 55, 72, 0.95);
    color: #e2e8f0;
}

.control-group {
    margin-bottom: 20px;
}

.control-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #4a5568;
}

body.dark-mode .control-group label {
    color: #cbd5e0;
}

.primary-btn, .secondary-btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-right: 10px;
    margin-bottom: 10px;
}

.primary-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.secondary-btn {
    background: #e2e8f0;
    color: #4a5568;
}

.secondary-btn:hover {
    background: #cbd5e0;
    transform: translateY(-2px);
}

input[type="range"] {
    width: 100%;
    margin: 10px 0;
    -webkit-appearance: none;
    height: 6px;
    border-radius: 3px;
    background: #e2e8f0;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #667eea;
    cursor: pointer;
}

input[type="color"] {
    width: 50px;
    height: 35px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
}

input[type="checkbox"] {
    margin-right: 8px;
    transform: scale(1.2);
}

.stats {
    background: #f7fafc;
    padding: 15px;
    border-radius: 8px;
    margin: 20px 0;
}

body.dark-mode .stats {
    background: #2d3748;
}

.stats div {
    margin-bottom: 5px;
    font-weight: 600;
}

.info-panel, .settings-panel {
    margin-top: 20px;
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    overflow: hidden;
}

body.dark-mode .info-panel,
body.dark-mode .settings-panel {
    border-color: #4a5568;
}

.info-panel summary,
.settings-panel summary {
    padding: 15px;
    background: #f7fafc;
    cursor: pointer;
    font-weight: 600;
    user-select: none;
}

body.dark-mode .info-panel summary,
body.dark-mode .settings-panel summary {
    background: #2d3748;
}

.info-content,
.settings-content {
    padding: 15px;
    border-top: 1px solid #e2e8f0;
}

body.dark-mode .info-content,
body.dark-mode .settings-content {
    border-top-color: #4a5568;
}

.info-content ol {
    margin-left: 20px;
    margin-top: 10px;
}

.info-content li {
    margin-bottom: 5px;
}

.canvas-container {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    padding: 20px;
    backdrop-filter: blur(10px);
    box-shadow: 0 8px 32px rgba(0,0,0,0.1);
    min-height: 600px;
}

body.dark-mode .canvas-container {
    background: rgba(45, 55, 72, 0.95);
}

#canvas {
    border: 2px solid #e2e8f0;
    border-radius: 10px;
    cursor: crosshair;
    transition: all 0.3s ease;
}

body.dark-mode #canvas {
    border-color: #4a5568;
}

#canvas:hover {
    box-shadow: 0 4px 20px rgba(102, 126, 234, 0.3);
}

.canvas-overlay {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 15px 25px;
    border-radius: 10px;
    text-align: center;
    font-size: 1.1rem;
    pointer-events: none;
    opacity: 0.9;
    transition: all 0.3s ease;
}

footer {
    text-align: center;
    color: white;
    opacity: 0.9;
    margin-top: 30px;
}

footer a {
    color: #fbbf24;
    text-decoration: none;
    font-weight: 600;
}

footer a:hover {
    text-decoration: underline;
}

#speedValue {
    font-size: 0.9rem;
    color: #6b46c1;
    font-weight: 600;
}

body.dark-mode #speedValue {
    color: #a78bfa;
}

/* Animations */
@keyframes glow {
    0%, 100% { box-shadow: 0 0 5px rgba(102, 126, 234, 0.5); }
    50% { box-shadow: 0 0 20px rgba(102, 126, 234, 0.8); }
}

.primary-btn:active {
    animation: glow 0.3s ease-in-out;
}

/* Mobile responsiveness */
@media (max-width: 480px) {
    .container {
        padding: 10px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .controls-panel {
        padding: 15px;
    }
    
    .canvas-container {
        padding: 10px;
        min-height: 400px;
    }
    
    .primary-btn, .secondary-btn {
        padding: 10px 20px;
        font-size: 0.9rem;
    }
}