:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --secondary-color: #8b5cf6;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --dark: #1f2937;
    --gray: #6b7280;
    --light-gray: #f3f4f6;
    --white: #ffffff;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: var(--dark);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.logo i {
    font-size: 1.8rem;
}

.nav {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-link {
    text-decoration: none;
    color: var(--gray);
    font-weight: 500;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-link:hover {
    color: var(--primary-color);
}

.anycoder-link {
    background: var(--primary-color);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    transition: var(--transition);
}

.anycoder-link:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

/* Main Layout */
.main {
    padding: 2rem 0;
    min-height: calc(100vh - 80px);
}

.editor-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 2rem;
    height: calc(100vh - 120px);
}

/* Toolbar */
.toolbar {
    background: white;
    border-radius: 1rem;
    padding: 1.5rem;
    box-shadow: var(--shadow-lg);
    overflow-y: auto;
}

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

.tool-section h3 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--gray);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 1rem;
}

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

.tool-btn {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    border: 2px solid var(--light-gray);
    background: white;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
}

.tool-btn:hover {
    border-color: var(--primary-color);
    background: var(--light-gray);
}

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

.tool-btn i {
    font-size: 1.2rem;
    width: 20px;
}

/* Slider Controls */
.slider-control {
    margin-bottom: 1rem;
}

.slider-control label {
    display: flex;
    justify-content: space-between;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.slider-control input[type="range"] {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: var(--light-gray);
    outline: none;
    -webkit-appearance: none;
}

.slider-control input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    transition: var(--transition);
}

.slider-control input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

/* Action Buttons */
.action-buttons {
    display: grid;
    gap: 0.75rem;
}

.btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    border: none;
    border-radius: 0.5rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.btn-secondary {
    background: var(--light-gray);
    color: var(--dark);
}

.btn-secondary:hover {
    background: #e5e7eb;
}

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

.btn-success:hover {
    background: #059669;
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

/* Mode Selector */
.mode-selector {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.radio-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem;
    border-radius: 0.375rem;
    cursor: pointer;
    transition: var(--transition);
}

.radio-label:hover {
    background: var(--light-gray);
}

.radio-label input[type="radio"] {
    accent-color: var(--primary-color);
}

/* Canvas Container */
.canvas-container {
    background: white;
    border-radius: 1rem;
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.canvas-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--light-gray);
}

.canvas-info {
    font-size: 0.875rem;
    color: var(--gray);
}

.canvas-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.zoom-btn {
    padding: 0.5rem;
    border: 1px solid var(--light-gray);
    background: white;
    border-radius: 0.375rem;
    cursor: pointer;
    transition: var(--transition);
}

.zoom-btn:hover {
    background: var(--light-gray);
}

#zoomLevel {
    font-size: 0.875rem;
    color: var(--gray);
    margin-left: 0.5rem;
}

.canvas-wrapper {
    flex: 1;
    position: relative;
    overflow: auto;
    background: repeating-conic-gradient(#f0f0f0 0% 25%, white 0% 50%) 50% / 20px 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.upload-prompt {
    text-align: center;
    padding: 3rem;
}

.upload-content i {
    font-size: 4rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.upload-content h2 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--dark);
}

.upload-content p {
    color: var(--gray);
    margin-bottom: 1.5rem;
}

canvas {
    position: absolute;
    cursor: crosshair;
    box-shadow: var(--shadow-lg);
}

#maskCanvas {
    pointer-events: none;
}

.canvas-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--light-gray);
}

.progress-bar {
    height: 6px;
    background: var(--light-gray);
    border-radius: 3px;
    overflow: hidden;
    position: relative;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 3px;
    width: 0%;
    transition: width 0.3s ease;
}

#progressText {
    position: absolute;
    right: 10px;
    top: -25px;
    font-size: 0.875rem;
    color: var(--gray);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: white;
    border-radius: 1rem;
    max-width: 600px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    border-bottom: 1px solid var(--light-gray);
}

.modal-header h2 {
    font-size: 1.5rem;
    color: var(--dark);
}

.close-btn {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--gray);
    transition: var(--transition);
}

.close-btn:hover {
    color: var(--dark);
}

.modal-body {
    padding: 1.5rem;
}

.tutorial-step {
    margin-bottom: 1.5rem;
}

.tutorial-step h3 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.tutorial-step p {
    color: var(--gray);
    line-height: 1.6;
}

.modal-body ul {
    margin-left: 1.5rem;
    color: var(--gray);
}

.modal-body li {
    margin-bottom: 0.5rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .editor-layout {
        grid-template-columns: 1fr;
        height: auto;
    }

    .toolbar {
        order: 2;
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: 1rem;
    }

    .canvas-container {
        order: 1;
        min-height: 500px;
    }

    .nav {
        gap: 1rem;
    }

    .nav-link span {
        display: none;
    }
}

/* Loading Animation */
@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.loading {
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--dark);
    color: white;
    padding: 1rem 1.5rem;
    border-radius: 0.5rem;
    box-shadow: var(--shadow-lg);
    transform: translateX(400px);
    transition: transform 0.3s ease;
    z-index: 2000;
}

.toast.show {
    transform: translateX(0);
}

.toast.success {
    background: var(--success-color);
}

.toast.error {
    background: var(--danger-color);
}

/* Drag and Drop */
.drag-over {
    background: rgba(99, 102, 241, 0.1);
    border: 2px dashed var(--primary-color);
}

/* Cursor Styles */
.cursor-brush {
    cursor: crosshair;
}

.cursor-eraser {
    cursor: grab;
}

.cursor-pan {
    cursor: move;
}