:root {
    /* Тёмная тема (по умолчанию) */
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-tertiary: #3d3d3d;
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --accent-primary: #4CAF50;
    --accent-secondary: #2196F3;
    --border-color: #444444;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

.light-theme {
    --bg-primary: #ffffff;
    --bg-secondary: #f5f5f5;
    --bg-tertiary: #e0e0e0;
    --text-primary: #333333;
    --text-secondary: #666666;
    --accent-primary: #45a049;
    --accent-secondary: #1976D2;
    --border-color: #dddddd;
    --shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
}

.header {
    background-color: var(--bg-secondary);
    padding: 1rem 2rem;
    box-shadow: var(--shadow);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
}

.header-content h1 {
    font-size: 1.5rem;
    margin-bottom: 0.25rem;
}

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

.theme-toggle {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    transition: background-color 0.3s;
}

.theme-toggle:hover {
    background-color: var(--bg-tertiary);
}

.main-container {
    display: grid;
    grid-template-columns: 300px 1fr 350px;
    height: calc(100vh - 80px);
    gap: 1px;
    background-color: var(--border-color);
}

.control-panel, .metrics-panel {
    background-color: var(--bg-secondary);
    padding: 1rem;
    overflow-y: auto;
}

.visualization-panel {
    background-color: var(--bg-primary);
    display: flex;
    flex-direction: column;
}

.canvas-container {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 1rem;
}

#grid-canvas {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    max-width: 100%;
    max-height: 100%;
}

.simulation-info {
    background-color: var(--bg-secondary);
    padding: 0.75rem;
    display: flex;
    justify-content: space-around;
    border-top: 1px solid var(--border-color);
}

.control-section {
    margin-bottom: 2rem;
}

.control-section h3 {
    margin-bottom: 1rem;
    color: var(--text-primary);
    font-size: 1rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}

.input-group {
    margin-bottom: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

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

.input-group input, .input-group select {
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    font-size: 0.9rem;
}

.input-group input:focus, .input-group select:focus {
    outline: none;
    border-color: var(--accent-secondary);
}

.control-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.btn {
    padding: 0.75rem 1rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.3s;
}

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

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

.btn:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

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

.preset-buttons, .export-buttons {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.preset-btn {
    padding: 0.5rem;
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.preset-btn:hover {
    background-color: var(--accent-secondary);
    color: white;
}

.metrics-display {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.metric {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem;
    background-color: var(--bg-tertiary);
    border-radius: 4px;
}

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

.charts-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.charts-container canvas {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    width: 100%;
    height: 150px;
}

/* Модальное окно */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
}

.modal-content {
    background-color: var(--bg-secondary);
    margin: 5% auto;
    padding: 2rem;
    border-radius: 8px;
    width: 90%;
    max-width: 500px;
    position: relative;
}

.close {
    position: absolute;
    right: 1rem;
    top: 1rem;
    font-size: 1.5rem;
    cursor: pointer;
}

/* Адаптивность */
@media (max-width: 1200px) {
    .main-container {
        grid-template-columns: 280px 1fr 300px;
    }
}

@media (max-width: 900px) {
    .main-container {
        grid-template-columns: 1fr;
        grid-template-rows: auto 1fr auto;
    }

    .control-panel, .metrics-panel {
        max-height: 300px;
    }
}