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

:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --danger-color: #dc2626;
    --danger-hover: #b91c1c;
    --bg-color: #f8fafc;
    --panel-bg: #ffffff;
    --border-color: #e2e8f0;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --success-color: #16a34a;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
}

.container {
    max-width: 1800px;
    margin: 0 auto;
    padding: 20px;
}

header {
    background: var(--panel-bg);
    padding: 30px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
    text-align: center;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    color: var(--primary-color);
}

header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

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

/* Controls Panel */
.controls-panel {
    background: var(--panel-bg);
    border-radius: 12px;
    padding: 20px;
    box-shadow: var(--shadow);
    max-height: calc(100vh - 200px);
    overflow-y: auto;
}

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

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

.control-section h2 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.control-section h3 {
    font-size: 1rem;
    margin: 15px 0 10px;
    color: var(--text-secondary);
    font-weight: 600;
}

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

.input-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
    color: var(--text-secondary);
}

.input-group input,
.input-group select {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
    transition: border-color 0.2s;
}

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

/* Buttons */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    width: 100%;
    margin-top: 10px;
}

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

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

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

.btn-secondary:hover {
    background: #475569;
    transform: translateY(-1px);
}

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

.btn-danger:hover {
    background: var(--danger-hover);
}

.furniture-btn {
    display: block;
    width: 100%;
    padding: 12px;
    margin-bottom: 8px;
    background: var(--bg-color);
    border: 2px solid var(--border-color);
    border-radius: 6px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s;
    text-align: left;
}

.furniture-btn:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: translateX(4px);
}

.furniture-btn:active {
    transform: translateX(4px) scale(0.98);
}

/* Selected Item Info */
.selected-info {
    background: var(--bg-color);
    padding: 15px;
    border-radius: 6px;
    margin-bottom: 10px;
}

.selected-info p {
    margin: 5px 0;
    font-size: 0.9rem;
}

.selected-controls {
    display: flex;
    gap: 10px;
    flex-direction: column;
}

/* Room Stats */
.stats p {
    margin: 10px 0;
    font-size: 0.95rem;
}

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

.stats span {
    color: var(--primary-color);
    font-weight: 600;
}

/* Canvas Container */
.canvas-container {
    background: var(--panel-bg);
    border-radius: 12px;
    padding: 20px;
    box-shadow: var(--shadow);
}

.canvas-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--border-color);
}

.canvas-header h2 {
    font-size: 1.5rem;
    color: var(--text-primary);
}

.view-controls {
    display: flex;
    gap: 20px;
}

.view-controls label {
    display: flex;
    align-items: center;
    gap: 5px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    cursor: pointer;
}

.view-controls input[type="checkbox"] {
    cursor: pointer;
    width: 18px;
    height: 18px;
}

.canvas-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
    background: #fafafa;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
    min-height: 600px;
}

#roomCanvas {
    border: 1px solid var(--border-color);
    background: white;
    cursor: default;
    box-shadow: var(--shadow-lg);
}

#roomCanvas.dragging {
    cursor: move;
}

.canvas-footer {
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid var(--border-color);
}

.hint {
    color: var(--text-secondary);
    font-size: 0.9rem;
    text-align: center;
}

/* Furniture Categories */
.furniture-categories {
    max-height: 400px;
    overflow-y: auto;
}

.category {
    margin-bottom: 20px;
}

/* Scrollbar Styling */
.controls-panel::-webkit-scrollbar,
.furniture-categories::-webkit-scrollbar {
    width: 8px;
}

.controls-panel::-webkit-scrollbar-track,
.furniture-categories::-webkit-scrollbar-track {
    background: var(--bg-color);
    border-radius: 4px;
}

.controls-panel::-webkit-scrollbar-thumb,
.furniture-categories::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

.controls-panel::-webkit-scrollbar-thumb:hover,
.furniture-categories::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-color);
}

/* Responsive Design */
@media (max-width: 1200px) {
    .main-content {
        grid-template-columns: 300px 1fr;
    }
}

@media (max-width: 968px) {
    .main-content {
        grid-template-columns: 1fr;
    }

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

    .canvas-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }

    .view-controls {
        flex-direction: column;
        gap: 10px;
    }
}

@media (max-width: 600px) {
    header h1 {
        font-size: 1.8rem;
    }

    header p {
        font-size: 0.9rem;
    }

    .container {
        padding: 10px;
    }

    #roomCanvas {
        width: 100% !important;
        height: auto !important;
    }
}