:root {
    --primary-color: #3a3a3a;
    --secondary-color: #2a2a2a;
    --background-dark: #202020;
    --surface-dark: #2a2a2a;
    --text-primary: #e0e0e0;
    --text-secondary: #a0a0a0;
    --success-color: #5a9e6e;
    --error-color: #cc5555;
    --warning-color: #cc9933;
    --border-color: #444;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--background-dark);
    color: var(--text-primary);
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.container {
    display: flex;
    width: 100%;
    max-width: 1400px;
    height: 90vh;
    background: var(--surface-dark);
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

#controls {
    width: 350px;
    padding: 20px;
    background: var(--secondary-color);
    overflow-y: auto;
}

.header {
    text-align: center;
    margin-bottom: 20px;
}

.header h2 {
    color: var(--text-primary);
    font-size: 1.5rem;
    margin-bottom: 8px;
}

.upload-section {
    background: var(--primary-color);
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    padding: 20px;
    text-align: center;
    margin-bottom: 20px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.upload-section:hover {
    border-color: var(--success-color);
}

.upload-icon {
    font-size: 2rem;
    margin-bottom: 10px;
    color: var(--text-secondary);
}

.file-input {
    display: none;
}

.preview-container {
    margin-top: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.preview-container canvas {
    width: 100%;
    height: auto;
    border-radius: 4px;
    border: 1px solid var(--border-color);
}

.control-group {
    margin-bottom: 15px;
}

.control-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.control-group input[type="range"] {
    width: 100%;
}

.checkbox-group {
    display: flex;
    align-items: center;
    margin-bottom: 15px;
}

.checkbox-group input[type="checkbox"] {
    margin-right: 10px;
}

button {
    width: 100%;
    padding: 10px;
    background: var(--primary-color);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s ease;
    margin-top: 10px;
}

button:hover:not(:disabled) {
    background: var(--secondary-color);
}

button:disabled {
    background: var(--background-dark);
    cursor: not-allowed;
}

#viewer {
    flex: 1;
    position: relative;
    background: radial-gradient(circle at center, #1a1a2e, #0f0f23);
    overflow: hidden;
}

#viewer canvas {
    width: 100% !important;
    height: 100% !important;
    display: block;
}

.info-panel {
    position: absolute;
    top: 20px;
    right: 20px;
    background: rgba(22, 22, 40, 0.9);
    backdrop-filter: blur(10px);
    padding: 16px;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    max-width: 250px;
    font-size: 0.9rem;
    line-height: 1.4;
    color: var(--text-secondary);
}

.info-title {
    color: var(--success-color);
    font-weight: 600;
    margin-bottom: 8px;
}

@media (max-width: 768px) {
    .container {
        flex-direction: column;
        height: auto;
    }

    #controls {
        width: 100%;
        height: auto;
    }

    #viewer {
        height: 50vh;
    }
}