:root {
    /* MATLAB Inspired Dark Theme */
    --bg-base: #1e1e1e;
    --bg-panel: #252526;
    --bg-input: #3c3c3c;
    --border-color: #3e3e42;
    --text-primary: #cccccc;
    --text-secondary: #858585;
    --accent: #007acc;
    --accent-hover: #0098ff;
    --danger: #f44336;
    --success: #4caf50;
    --warning: #ff9800;
    --font-ui: 'Inter', sans-serif;
    --font-mono: 'Fira Code', monospace;
}

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

body {
    background-color: var(--bg-base);
    color: var(--text-primary);
    font-family: var(--font-ui);
    height: 100vh;
    overflow: hidden;
}

.app-container {
    display: flex;
    height: 100vh;
    width: 100vw;
    position: relative;
}

/* Sidebar */
.sidebar {
    width: 800px;
    max-width: 90vw;
    background-color: var(--bg-panel);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    position: absolute;
    left: -850px;
    top: 0;
    height: 100%;
    z-index: 100;
    transition: left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.sidebar.open {
    left: 30px;
}

.sidebar-header {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-content {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    align-items: start;
    align-content: start;
}

.canvas-cell {
    flex: 1;
    position: relative;
    border: 1px solid var(--border-color);
    box-sizing: border-box;
}

.canvas-toolbar {
    position: absolute;
    bottom: 10px;
    right: 10px;
    display: flex;
    gap: 5px;
    background: rgba(0, 0, 0, 0.5);
    padding: 6px;
    border-radius: 6px;
    z-index: 10;
}

.canvas-toolbar button {
    background: var(--bg-panel);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    cursor: pointer;
    border-radius: 4px;
    padding: 4px 10px;
    font-size: 14px;
    font-weight: bold;
    transition: background 0.2s;
}

.canvas-toolbar button:hover {
    background: var(--bg-input);
}

.sidebar-footer {
    padding: 1rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

/* Toggle Column */
.sidebar-toggle-col {
    width: 30px;
    background-color: var(--bg-panel);
    border-right: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 101;
    flex-shrink: 0;
}

.sidebar-toggle-col:hover {
    background-color: var(--bg-input);
}

.sidebar-toggle-col .arrow {
    transition: transform 0.3s ease;
}

/* Overlay */
#canvas-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    z-index: 99;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

#canvas-overlay.active {
    opacity: 1;
    pointer-events: all;
}

/* Main Area */
.main-area {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    height: 100%;
}

.canvas-wrapper {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

/* Compare Mode Grid */
.compare-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 1fr 1fr;
    width: 100%;
    height: 100%;
    gap: 2px;
    background: var(--border-color);
}

.canvas-cell {
    background: var(--bg-base);
    position: relative;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.canvas-algo-label {
    position: absolute;
    top: 10px;
    left: 10px;
    color: #fff;
    background: rgba(0,0,0,0.6);
    padding: 6px 10px;
    font-weight: 600;
    border-radius: 4px;
    z-index: 5;
    font-size: 13px;
    letter-spacing: 0.5px;
    transition: color 0.3s ease;
}

/* Resizer */
.resizer {
    width: 6px;
    cursor: col-resize;
    background-color: var(--border-color);
    z-index: 10;
}
.resizer:hover {
    background-color: var(--accent);
}

/* Stats Panel */
.stats-panel {
    width: 400px;
    min-width: 200px;
    max-width: 600px;
    background-color: var(--bg-panel);
    border-left: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

.scenario-controls {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.status-indicator {
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

.status-badge {
    padding: 2px 6px;
    border-radius: 4px;
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
}

.status-badge.pending { background: #555; color: #fff; }
.status-badge.ready { background: var(--accent); color: #fff; }
.status-badge.running { background: var(--warning); color: #fff; }
.status-badge.finished { background: var(--success); color: #fff; }

.btn-group {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

/* Terminal */
.stats-console {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.console-header {
    padding: 0.5rem 1rem;
    background: #1a1a1a;
    font-size: 0.8rem;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.terminal-output {
    flex: 1;
    padding: 1rem;
    background: #000;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    overflow-y: auto;
}

.log-line { margin-bottom: 4px; }
.log-line.info { color: #cccccc; }
.log-line.info-blue { color: var(--accent); }
.log-line.success { color: var(--success); }
.log-line.warning { color: var(--warning); }
.log-line.error { color: var(--danger); }

/* Buttons */
.btn {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-family: inherit;
    font-weight: 500;
    transition: background 0.2s, opacity 0.2s;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn.primary { background: var(--accent); color: #fff; }
.btn.primary:hover:not(:disabled) { background: var(--accent-hover); }

.btn.outline { background: transparent; border: 1px solid var(--border-color); color: var(--text-primary); }
.btn.outline:hover:not(:disabled) { background: rgba(255,255,255,0.05); }

.hidden { display: none !important; }

/* Config Form Elements */
.config-group {
    margin-bottom: 0;
}

.config-group h3 {
    font-size: 0.9rem;
    color: var(--accent);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.config-item {
    margin-bottom: 0.75rem;
}

.config-item label {
    display: block;
    font-size: 0.85rem;
    margin-bottom: 0.25rem;
    color: var(--text-secondary);
}

.config-item.staged label {
    font-style: italic;
    color: var(--warning);
}
.config-item.staged label::after {
    content: ' *';
}

.config-item.modified label {
    font-style: italic;
    color: var(--accent);
}

.config-input {
    width: 100%;
    padding: 0.4rem;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: 2px;
}

.config-input:focus {
    outline: none;
    border-color: var(--accent);
}

.slider-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.slider-group input[type="range"] {
    flex: 1;
}

.slider-group input[type="number"] {
    width: 90px;
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.8);
    z-index: 1000;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s;
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.modal-box {
    background: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 20px 24px;
    width: 450px;
    max-width: 90vw;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    transform: scale(0.95);
    transition: transform 0.2s;
}

.modal-overlay.active .modal-box {
    transform: scale(1);
}

.modal-box h3 {
    margin-top: 0;
    margin-bottom: 1rem;
    color: var(--accent);
    font-size: 1.2rem;
}

.modal-content {
    color: var(--text-primary);
    line-height: 1.5;
    font-size: 0.95rem;
}

.modal-actions {
    margin-top: 24px;
    display: flex;
    justify-content: flex-end;
    gap: 12px;
}

/* Portrait / Vertical Layout */
@media (orientation: portrait) {
    .app-container {
        flex-direction: column;
        padding-left: 30px;
        box-sizing: border-box;
    }
    
    .stats-panel {
        width: 100% !important;
        max-width: none;
        height: 45vh;
        border-left: none;
        border-top: 1px solid var(--border-color);
    }
    
    .resizer {
        width: 100%;
        height: 6px;
        cursor: row-resize;
    }
    
    .sidebar {
        width: calc(100% - 30px);
        left: -100%;
        position: fixed;
        height: 100vh;
    }
    .sidebar.open {
        left: 30px;
    }
    .sidebar-toggle-col {
        position: fixed;
        top: 0;
        left: 0;
        height: 100%;
        z-index: 101;
    }
}

/* Mobile Layout */
@media (max-width: 768px) {
    body {
        overflow: auto;
    }
    
    .app-container {
        flex-direction: column;
        height: auto;
        min-height: 100vh;
        padding-left: 30px;
        box-sizing: border-box;
    }
    
    .main-area {
        height: auto;
        min-height: 50vh;
    }
    
    .canvas-wrapper {
        position: relative;
        height: 50vh;
    }
    
    .canvas-wrapper.compare-grid {
        grid-template-columns: 1fr;
        grid-template-rows: repeat(4, 50vh);
        height: auto;
    }
    
    .resizer {
        display: none;
    }
    
    .stats-panel {
        display: contents;
    }
    
    .scenario-controls {
        order: -1;
        position: sticky;
        top: 0;
        z-index: 90;
        background-color: var(--bg-panel);
        border-bottom: 1px solid var(--border-color);
        padding: 15px;
    }
    
    .stats-console {
        order: 3;
        height: 60vh;
        width: 100%;
        background-color: var(--bg-panel);
        display: flex;
        flex-direction: column;
    }
    
    .sidebar {
        position: fixed;
        height: 100vh;
        width: calc(100% - 30px);
        left: -100%;
    }
    .sidebar.open {
        left: 30px;
    }
    .sidebar-toggle-col {
        position: fixed;
        top: 0;
        left: 0;
        height: 100%;
        z-index: 101;
    }
}