:root {
    /* Satisfactory-inspired color palette */
    --primary-bg: #1a1a1a;
    --secondary-bg: #252525;
    --tertiary-bg: #2d2d2d;
    --accent-orange: #ff8c42;
    --accent-yellow: #ffd700;
    --grid-color: #333333;
    --text-primary: #e0e0e0;
    --text-secondary: #a0a0a0;
    --border-color: #404040;
    --danger: #ff4444;
    --success: #44ff88;
    
    /* Fonts */
    --font-display: 'Orbitron', sans-serif;
    --font-body: 'Rajdhani', sans-serif;
    
    /* Grid settings */
    --grid-size: 40px;
}

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

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

.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

/* Header */
.header {
    background: var(--secondary-bg);
    border-bottom: 3px solid var(--accent-orange);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

.header-left {
    display: flex;
    align-items: baseline;
    gap: 1rem;
}

.title {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 900;
    color: var(--accent-orange);
    letter-spacing: 3px;
    text-shadow: 0 0 10px rgba(255, 140, 66, 0.5);
}

.subtitle {
    font-family: var(--font-display);
    font-size: 0.75rem;
    color: var(--text-secondary);
    letter-spacing: 2px;
    font-weight: 400;
}

.header-right {
    display: flex;
    gap: 0.75rem;
}

/* Buttons */
.btn {
    font-family: var(--font-body);
    font-weight: 600;
    padding: 0.5rem 1.25rem;
    border: 2px solid var(--border-color);
    background: var(--tertiary-bg);
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.2s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.btn:hover {
    background: var(--accent-orange);
    border-color: var(--accent-orange);
    color: var(--primary-bg);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(255, 140, 66, 0.4);
}

.btn-primary {
    background: var(--accent-orange);
    border-color: var(--accent-orange);
    color: var(--primary-bg);
}

.btn-primary:hover {
    background: var(--accent-yellow);
    border-color: var(--accent-yellow);
}

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

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

.btn-icon {
    font-size: 1rem;
}

/* Main Content */
.main-content {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* Sidebar */
.sidebar {
    width: 300px;
    background: var(--secondary-bg);
    border-right: 2px solid var(--border-color);
    overflow-y: auto;
    padding: 1.5rem;
}

.sidebar-section {
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

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

.section-title {
    font-family: var(--font-display);
    font-size: 1rem;
    color: var(--accent-orange);
    margin-bottom: 1rem;
    letter-spacing: 2px;
    font-weight: 700;
}

.control-group {
    margin-bottom: 1rem;
}

.control-group label {
    display: block;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    font-weight: 500;
}

.control-group input[type="checkbox"] {
    margin-right: 0.5rem;
    cursor: pointer;
}

.zoom-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
    justify-content: space-between;
    margin-top: 0.5rem;
}

.btn-icon-small {
    width: 32px;
    height: 32px;
    border: 2px solid var(--border-color);
    background: var(--tertiary-bg);
    color: var(--accent-orange);
    cursor: pointer;
    font-size: 1.2rem;
    font-weight: bold;
    transition: all 0.2s ease;
}

.btn-icon-small:hover {
    background: var(--accent-orange);
    color: var(--primary-bg);
    border-color: var(--accent-orange);
}

#zoomLevel {
    font-weight: 600;
    color: var(--accent-yellow);
}

/* Machine List */
.machine-category {
    margin-bottom: 1rem;
}

.category-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem;
    background: var(--tertiary-bg);
    border: 2px solid var(--border-color);
    cursor: pointer;
    transition: all 0.2s ease;
    margin-bottom: 0.5rem;
}

.category-header:hover {
    border-color: var(--accent-orange);
    background: rgba(255, 140, 66, 0.1);
}

.category-name {
    font-family: var(--font-display);
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--accent-orange);
    letter-spacing: 1px;
}

.category-arrow {
    color: var(--text-secondary);
    transition: transform 0.2s ease;
    font-size: 0.8rem;
}

.category-header.collapsed .category-arrow {
    transform: rotate(-90deg);
}

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

.machine-list.collapsed {
    display: none;
}

.machine-item {
    background: var(--tertiary-bg);
    border: 2px solid var(--border-color);
    padding: 0.75rem;
    cursor: grab;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.machine-item:hover {
    border-color: var(--accent-orange);
    background: rgba(255, 140, 66, 0.1);
    transform: translateX(5px);
}

.machine-item:active {
    cursor: grabbing;
}

.machine-icon {
    font-size: 2rem;
    width: 40px;
    text-align: center;
}

.machine-info {
    flex: 1;
}

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

.machine-size {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-top: 0.2rem;
}

/* Stats */
.stats {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.stat-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem;
    background: var(--tertiary-bg);
    border-left: 3px solid var(--accent-orange);
}

.stat-label {
    color: var(--text-secondary);
    font-weight: 500;
}

.stat-value {
    color: var(--accent-yellow);
    font-weight: 700;
    font-size: 1.1rem;
}

/* Canvas Area */
.canvas-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--primary-bg);
    position: relative;
}

.canvas-wrapper {
    flex: 1;
    position: relative;
    overflow: auto;
}

#gridCanvas {
    position: absolute;
    top: 0;
    left: 0;
    z-index: 1;
}

#machineContainer {
    position: absolute;
    top: 0;
    left: 0;
    z-index: 2;
    width: 100%;
    height: 100%;
}

.placed-machine {
    position: absolute;
    border: 2px solid var(--accent-orange);
    background: rgba(255, 140, 66, 0.15);
    cursor: move;
    transition: all 0.2s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    backdrop-filter: blur(5px);
}

.placed-machine:hover {
    border-color: var(--accent-yellow);
    background: rgba(255, 215, 0, 0.2);
    box-shadow: 0 0 20px rgba(255, 140, 66, 0.6);
    z-index: 10;
}

.placed-machine.selected {
    border-color: var(--accent-yellow);
    box-shadow: 0 0 30px rgba(255, 215, 0, 0.8);
}

.placed-machine.multi-selected {
    border-color: var(--accent-yellow);
    box-shadow: 0 0 20px rgba(255, 215, 0, 0.6);
}

.machine-label {
    font-size: 0.9rem;
    color: var(--text-primary);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.8);
    pointer-events: none;
}

.machine-rates {
    font-size: 0.75rem;
    color: var(--accent-yellow);
    margin-top: 0.25rem;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.8);
    pointer-events: none;
}

.canvas-info {
    background: var(--secondary-bg);
    border-top: 2px solid var(--border-color);
    padding: 0.5rem 1rem;
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

#cursorPos {
    font-family: var(--font-display);
    color: var(--accent-yellow);
    font-weight: 600;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(5px);
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background: var(--secondary-bg);
    border: 3px solid var(--accent-orange);
    width: 90%;
    max-width: 500px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.8);
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from {
        transform: translateY(50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-header {
    padding: 1.5rem;
    border-bottom: 2px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    font-family: var(--font-display);
    font-size: 1.2rem;
    color: var(--accent-orange);
    letter-spacing: 2px;
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 2rem;
    cursor: pointer;
    line-height: 1;
    transition: color 0.2s ease;
}

.modal-close:hover {
    color: var(--danger);
}

.modal-body {
    padding: 1.5rem;
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    font-weight: 600;
    font-size: 0.9rem;
}

.form-control {
    width: 100%;
    padding: 0.75rem;
    background: var(--tertiary-bg);
    border: 2px solid var(--border-color);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.95rem;
    transition: all 0.2s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--accent-orange);
    box-shadow: 0 0 10px rgba(255, 140, 66, 0.3);
}

.form-control::placeholder {
    color: var(--text-secondary);
    opacity: 0.6;
}

.modal-footer {
    padding: 1.5rem;
    border-top: 2px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    gap: 1rem;
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--primary-bg);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border: 2px solid var(--primary-bg);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-orange);
}

/* Selection box */
.selection-box {
    position: absolute;
    border: 2px dashed var(--accent-yellow);
    background: rgba(255, 215, 0, 0.1);
    pointer-events: none;
    z-index: 1000;
    display: none;
}

.selection-box.active {
    display: block;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        width: 250px;
    }
    
    .title {
        font-size: 1.5rem;
    }
    
    .subtitle {
        display: none;
    }
    
    .header {
        padding: 1rem;
    }
}

/* Toast Notifications */
@keyframes slideIn {
    from {
        transform: translateX(400px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes slideOut {
    from {
        transform: translateX(0);
        opacity: 1;
    }
    to {
        transform: translateX(400px);
        opacity: 0;
    }
}