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

:root {
    --bg-primary: #0a0e1a;
    --bg-secondary: #111827;
    --bg-tertiary: #1f2937;
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --accent-blue: #3b82f6;
    --accent-green: #10b981;
    --accent-red: #ef4444;
    --accent-yellow: #f59e0b;
    --accent-purple: #8b5cf6;
    --border-color: #374151;
    --shadow: rgba(0, 0, 0, 0.3);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

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

header {
    text-align: center;
    margin-bottom: 30px;
    padding: 20px;
    background: var(--bg-secondary);
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.main-content {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 20px;
    margin-bottom: 30px;
}

.controls-panel {
    background: var(--bg-secondary);
    border-radius: 12px;
    padding: 20px;
    border: 1px solid var(--border-color);
    height: fit-content;
}

.control-section {
    margin-bottom: 25px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
}

.control-section:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.control-section h3 {
    font-size: 1.1rem;
    margin-bottom: 12px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.select-input {
    width: 100%;
    padding: 10px 12px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 0.95rem;
    cursor: pointer;
    transition: border-color 0.2s;
}

.select-input:hover {
    border-color: var(--accent-blue);
}

.select-input:focus {
    outline: none;
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.button-group {
    display: flex;
    gap: 8px;
    margin-bottom: 15px;
}

.btn {
    flex: 1;
    padding: 10px 16px;
    border: none;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow);
}

.btn:active {
    transform: translateY(0);
}

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

.btn-primary:hover {
    background: #2563eb;
}

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

.btn-success:hover {
    background: #059669;
}

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

.btn-secondary:hover {
    background: var(--border-color);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.speed-control {
    display: flex;
    align-items: center;
    gap: 10px;
}

.speed-control label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    min-width: 60px;
}

.slider {
    flex: 1;
    height: 6px;
    background: var(--bg-tertiary);
    border-radius: 3px;
    outline: none;
    -webkit-appearance: none;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    background: var(--accent-blue);
    border-radius: 50%;
    cursor: pointer;
    transition: background 0.2s;
}

.slider::-webkit-slider-thumb:hover {
    background: #2563eb;
}

.slider::-moz-range-thumb {
    width: 18px;
    height: 18px;
    background: var(--accent-blue);
    border: none;
    border-radius: 50%;
    cursor: pointer;
}

#speedValue {
    font-size: 0.85rem;
    color: var(--text-secondary);
    min-width: 50px;
    text-align: right;
}

.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.stat-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 12px;
    background: var(--bg-tertiary);
    border-radius: 6px;
}

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

.stat-value {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.stat-value.status-ready {
    color: var(--accent-blue);
}

.stat-value.status-running {
    color: var(--accent-green);
}

.stat-value.status-conflict {
    color: var(--accent-red);
}

.stat-value.status-solution {
    color: var(--accent-green);
}

.instructions {
    list-style: none;
    font-size: 0.9rem;
}

.instructions li {
    padding: 6px 0;
    color: var(--text-secondary);
}

.instructions li strong {
    color: var(--text-primary);
}

.domain-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.domain-item {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 4px 8px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    font-size: 0.85rem;
}

.domain-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.canvas-container {
    background: var(--bg-secondary);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    overflow: hidden;
    position: relative;
}

#networkCanvas {
    width: 100%;
    height: 700px;
    display: block;
    cursor: crosshair;
}

.tooltip {
    position: absolute;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px;
    font-size: 0.9rem;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.2s;
    max-width: 300px;
    z-index: 100;
    box-shadow: 0 4px 12px var(--shadow);
}

.tooltip.visible {
    opacity: 1;
}

.tooltip h4 {
    margin-bottom: 6px;
    color: var(--accent-blue);
}

.tooltip p {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

footer {
    background: var(--bg-secondary);
    border-radius: 12px;
    padding: 20px;
    border: 1px solid var(--border-color);
}

.explanation {
    margin-bottom: 20px;
    padding: 15px;
    background: var(--bg-tertiary);
    border-radius: 8px;
    border-left: 4px solid var(--accent-blue);
}

.explanation h3 {
    margin-bottom: 10px;
    color: var(--text-primary);
}

#explanationText {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.key-concepts h3 {
    margin-bottom: 15px;
    color: var(--text-primary);
}

.concept-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 15px;
}

.concept-card {
    background: var(--bg-tertiary);
    padding: 15px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    transition: all 0.2s;
}

.concept-card:hover {
    border-color: var(--accent-blue);
    transform: translateY(-2px);
}

.concept-card h4 {
    margin-bottom: 8px;
    color: var(--accent-blue);
    font-size: 1rem;
}

.concept-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

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

    .controls-panel {
        order: 2;
    }

    .canvas-container {
        order: 1;
    }

    #networkCanvas {
        height: 500px;
    }
}

@media (max-width: 768px) {
    header h1 {
        font-size: 1.8rem;
    }

    .subtitle {
        font-size: 0.95rem;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .concept-grid {
        grid-template-columns: 1fr;
    }
}

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

@keyframes slideIn {
    from {
        transform: translateX(-10px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}