:root {
    --primary-red: #dc2626;
    --dark-red: #991b1b;
    --light-red: #f87171;
    --black: #000000;
    --dark-gray: #111111;
    --medium-gray: #222222;
    --light-gray: #333333;
    --text-white: #ffffff;
    --text-gray: #d1d5db;
    --accent-gold: #fbbf24;
    --success-green: #10b981;
    --border-color: #374151;
    --shadow-dark: rgba(0, 0, 0, 0.5);
    --gradient-red: linear-gradient(135deg, var(--primary-red), var(--dark-red));
}

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

body {
    font-family: 'Roboto', sans-serif;
    background: var(--black);
    color: var(--text-white);
    overflow-x: hidden;
}

.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background: linear-gradient(45deg, var(--black), var(--dark-gray));
}

/* Header */
.header {
    background: var(--gradient-red);
    padding: 1rem 0;
    box-shadow: 0 2px 10px var(--shadow-dark);
    position: relative;
    z-index: 100;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: 'Orbitron', monospace;
    font-size: 1.8rem;
    font-weight: 900;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.header-actions {
    display: flex;
    gap: 1rem;
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    min-height: calc(100vh - 120px);
}

/* Control Panel */
.control-panel {
    width: 320px;
    background: var(--medium-gray);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    transition: transform 0.3s ease;
    position: relative;
    z-index: 50;
}

.control-panel.collapsed {
    transform: translateX(-280px);
}

.panel-header {
    padding: 1rem;
    background: var(--light-gray);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.panel-header h2 {
    font-size: 1.2rem;
    font-weight: 500;
}

.panel-toggle {
    background: none;
    border: none;
    color: var(--text-white);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 4px;
    transition: all 0.2s;
}

.panel-toggle:hover {
    background: var(--border-color);
}

.panel-content {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
}

.control-group {
    margin-bottom: 1.5rem;
}

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

.input-field {
    width: 100%;
    padding: 0.75rem;
    background: var(--dark-gray);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-white);
    font-size: 0.9rem;
    transition: all 0.2s;
}

.input-field:focus {
    outline: none;
    border-color: var(--primary-red);
    box-shadow: 0 0 0 2px rgba(220, 38, 38, 0.2);
}

.input-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
}

.input-with-slider {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.5rem;
}

.slider {
    width: 100%;
    height: 6px;
    background: var(--border-color);
    border-radius: 3px;
    outline: none;
    -webkit-appearance: none;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    background: var(--primary-red);
    border-radius: 50%;
    cursor: pointer;
}

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

.preset-buttons {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.checkbox {
    margin-right: 0.5rem;
    accent-color: var(--primary-red);
}

/* Buttons */
.btn {
    padding: 0.75rem 1rem;
    border: none;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
}

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

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(220, 38, 38, 0.3);
}

.btn-secondary {
    background: var(--light-gray);
    color: var(--text-white);
    border: 1px solid var(--border-color);
}

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

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

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

.btn-outline {
    background: transparent;
    color: var(--text-white);
    border: 1px solid var(--text-white);
}

.btn-outline:hover {
    background: var(--text-white);
    color: var(--black);
}

.btn-small {
    padding: 0.5rem 0.75rem;
    font-size: 0.8rem;
}

.action-buttons {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.75rem;
    margin: 1.5rem 0;
}

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

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

#canvas {
    border: 2px solid var(--border-color);
    border-radius: 8px;
    box-shadow: 0 8px 32px var(--shadow-dark);
    cursor: crosshair;
    max-width: 100%;
    max-height: 100%;
    background: var(--black);
}

.canvas-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    display: flex;
    align-items: center;
    justify-content: center;
}

.loading-spinner {
    background: rgba(0, 0, 0, 0.8);
    padding: 2rem;
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    color: var(--text-white);
}

.loading-spinner i {
    font-size: 2rem;
    color: var(--primary-red);
}

.canvas-info {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: rgba(0, 0, 0, 0.7);
    padding: 0.5rem 1rem;
    border-radius: 4px;
    font-family: 'Orbitron', monospace;
    font-size: 0.8rem;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    pointer-events: none;
}

.nav-controls {
    position: absolute;
    bottom: 1rem;
    left: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.nav-btn {
    width: 48px;
    height: 48px;
    background: rgba(220, 38, 38, 0.9);
    border: none;
    border-radius: 50%;
    color: var(--text-white);
    font-size: 1.2rem;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.nav-btn:hover {
    background: var(--primary-red);
    transform: scale(1.1);
}

.nav-btn.active {
    background: var(--accent-gold);
}

/* Status Bar */
.status-bar {
    background: var(--light-gray);
    padding: 0.75rem 1rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
    color: var(--text-gray);
}

.status-info, .status-actions {
    display: flex;
    gap: 1rem;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}

.modal.show {
    display: flex;
}

.modal-content {
    background: var(--medium-gray);
    border-radius: 8px;
    max-width: 600px;
    width: 90%;
    max-height: 80%;
    overflow-y: auto;
    border: 1px solid var(--border-color);
}

.modal-header {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-white);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.25rem;
}

.modal-body {
    padding: 1rem;
}

.modal-body h4 {
    color: var(--primary-red);
    margin: 1rem 0 0.5rem 0;
}

.modal-body ul {
    margin-left: 1rem;
    margin-bottom: 1rem;
}

.modal-body li {
    margin-bottom: 0.5rem;
    color: var(--text-gray);
}

/* Responsive Design */
@media (max-width: 768px) {
    .header-content {
        padding: 0 0.5rem;
    }
    
    .logo {
        font-size: 1.4rem;
    }
    
    .header-actions .btn {
        padding: 0.5rem;
        font-size: 0.8rem;
    }
    
    .main-content {
        flex-direction: column;
    }
    
    .control-panel {
        width: 100%;
        max-height: 40vh;
        order: 2;
        border-right: none;
        border-top: 1px solid var(--border-color);
    }
    
    .control-panel.collapsed {
        transform: translateY(calc(100% - 60px));
    }
    
    .canvas-area {
        order: 1;
        min-height: 60vh;
    }
    
    .panel-content {
        max-height: calc(40vh - 60px);
    }
    
    .input-row {
        grid-template-columns: 1fr;
    }
    
    .preset-buttons {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .nav-controls {
        position: fixed;
        bottom: calc(40vh + 1rem);
        flex-direction: row;
        left: 50%;
        transform: translateX(-50%);
    }
}

@media (max-width: 480px) {
    .canvas-container {
        padding: 0.5rem;
    }
    
    .action-buttons {
        grid-template-columns: 1fr 1fr;
    }
    
    .panel-content {
        padding: 0.5rem;
    }
    
    .control-group {
        margin-bottom: 1rem;
    }
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.control-group {
    animation: fadeIn 0.3s ease-out;
}

/* Scrollbar Styling */
.panel-content::-webkit-scrollbar {
    width: 8px;
}

.panel-content::-webkit-scrollbar-track {
    background: var(--dark-gray);
}

.panel-content::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

.panel-content::-webkit-scrollbar-thumb:hover {
    background: var(--primary-red);
}