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

:root {
    --bg-primary: #0a0e27;
    --bg-secondary: #141b3d;
    --bg-tertiary: #1e2749;
    --text-primary: #e0e6ff;
    --text-secondary: #9ba4d0;
    --accent: #4d7cfe;
    --accent-hover: #6b94ff;
    --border: #2a3563;
    --edge-color: #4d7cfe;
    --vertex-color: #ffd700;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--bg-primary) 0%, #0d1533 100%);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
}

.container {
    max-width: 1600px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 30px;
    padding: 20px 0;
    border-bottom: 2px solid var(--border);
}

h1 {
    font-size: 3rem;
    font-weight: 300;
    letter-spacing: 8px;
    color: var(--accent);
    text-transform: uppercase;
    margin-bottom: 5px;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
    letter-spacing: 2px;
}

.main-content {
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: 30px;
    margin-bottom: 30px;
}

.canvas-container {
    position: relative;
    background: var(--bg-secondary);
    border-radius: 12px;
    border: 2px solid var(--border);
    overflow: hidden;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
}

#viewport {
    display: block;
    cursor: grab;
    width: 100%;
    height: 100%;
    min-height: 600px;
}

#viewport:active {
    cursor: grabbing;
}

.canvas-info {
    position: absolute;
    top: 10px;
    left: 10px;
    background: rgba(10, 14, 39, 0.8);
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    display: flex;
    gap: 15px;
    backdrop-filter: blur(10px);
}

.controls-panel {
    background: var(--bg-secondary);
    border-radius: 12px;
    border: 2px solid var(--border);
    padding: 20px;
    overflow-y: auto;
    max-height: 85vh;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
}

.control-section {
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border);
}

.control-section:last-child {
    border-bottom: none;
}

h3 {
    font-size: 1.1rem;
    margin-bottom: 15px;
    color: var(--accent);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.file-inputs {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 15px;
}

.file-input-group {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.file-input-group label {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.optional {
    font-size: 0.75rem;
    color: var(--text-secondary);
    opacity: 0.7;
}

input[type="file"] {
    padding: 8px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 0.9rem;
    cursor: pointer;
}

input[type="file"]::-webkit-file-upload-button {
    background: var(--accent);
    color: white;
    border: none;
    padding: 6px 12px;
    border-radius: 4px;
    cursor: pointer;
    margin-right: 10px;
    transition: background 0.2s;
}

input[type="file"]::-webkit-file-upload-button:hover {
    background: var(--accent-hover);
}

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

.slider-group label {
    display: grid;
    grid-template-columns: 40px 1fr 50px;
    gap: 10px;
    align-items: center;
}

.slider-label {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.slider-value {
    text-align: right;
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-family: 'Courier New', monospace;
}

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    background: var(--bg-tertiary);
    border-radius: 3px;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    background: var(--accent);
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.2s;
}

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

input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    background: var(--accent);
    border-radius: 50%;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
}

input[type="range"]::-moz-range-thumb:hover {
    background: var(--accent-hover);
    transform: scale(1.2);
}

.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 15px;
}

.checkbox-group label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    color: var(--text-primary);
    font-size: 0.95rem;
}

input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--accent);
}

button {
    width: 100%;
    padding: 12px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: all 0.2s;
}

.btn-primary {
    background: var(--accent);
    color: white;
}

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(77, 124, 254, 0.4);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

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

footer {
    text-align: center;
    padding: 20px;
    border-top: 2px solid var(--border);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

footer strong {
    color: var(--text-primary);
}

/* Responsive */
@media (max-width: 1200px) {
    .main-content {
        grid-template-columns: 1fr;
    }

    .controls-panel {
        max-height: none;
    }
}

@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
        letter-spacing: 4px;
    }

    .canvas-info {
        flex-direction: column;
        gap: 5px;
        font-size: 0.75rem;
    }
}