:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --background-color: #ecf0f1;
    --danger-color: #e74c3c;
    --success-color: #2ecc71;
    --text-dark: #2c3e50;
    --text-light: #7f8c8d;
    --border-color: #bdc3c7;
    --shadow: 0 2px 10px rgba(0,0,0,0.1);
    --border-radius: 8px;
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--background-color);
    background-image: 
        radial-gradient(circle at 25px 25px, rgba(255,255,255,0.2) 2%, transparent 0%), 
        radial-gradient(circle at 75px 75px, rgba(255,255,255,0.1) 1%, transparent 0%);
    background-size: 100px 100px;
    color: var(--text-dark);
    line-height: 1.6;
    padding-bottom: 80px;
    min-height: 100vh;
}

.app-header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 20px;
    text-align: center;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.app-header h1 {
    font-size: 1.8rem;
    margin-bottom: 5px;
    font-weight: 600;
}

.app-header p {
    opacity: 0.9;
    font-size: 0.9rem;
}

.app-main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

.content-section {
    display: none;
    animation: fadeIn 0.3s ease;
}

.content-section.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.upload-area {
    margin-bottom: 30px;
}

.upload-zone {
    border: 3px dashed var(--secondary-color);
    border-radius: var(--border-radius);
    padding: 40px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    background: white;
    box-shadow: var(--shadow);
}

.upload-zone:hover {
    border-color: var(--primary-color);
    background-color: #f8f9fa;
}

.upload-zone.dragover {
    border-color: var(--success-color);
    background-color: rgba(46, 204, 113, 0.1);
}

.upload-icon {
    font-size: 3rem;
    color: var(--secondary-color);
    margin-bottom: 15px;
}

.images-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
}

.image-card {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: var(--transition);
    cursor: pointer;
}

.image-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.15);
}

.image-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.image-info {
    padding: 15px;
}

.image-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
    margin-bottom: 10px;
}

.tag {
    background: var(--secondary-color);
    color: white;
    padding: 3px 8px;
    border-radius: 12px;
    font-size: 0.8rem;
}

.color-palette {
    display: flex;
    gap: 5px;
    margin-top: 10px;
}

.color-swatch {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    border: 2px solid white;
    box-shadow: 0 1px 3px rgba(0,0,0,0.3);
    cursor: pointer;
    position: relative;
}

.color-swatch:hover::after {
    content: attr(data-color);
    position: absolute;
    bottom: -25px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--text-dark);
    color: white;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.7rem;
    white-space: nowrap;
    z-index: 10;
}

.btn-primary, .btn-secondary, .btn-danger {
    padding: 12px 24px;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    font-size: 0.9rem;
}

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

.btn-primary:hover {
    background: #2980b9;
    transform: translateY(-2px);
}

.btn-secondary {
    background: var(--background-color);
    color: var(--text-dark);
    border: 2px solid var(--border-color);
}

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

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

.btn-danger:hover {
    background: #c0392b;
}

.moodboard-header, .trends-header, .patterns-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    flex-wrap: wrap;
    gap: 15px;
}

.moodboard-header h2, .trends-header h2, .patterns-header h2 {
    color: var(--primary-color);
    font-size: 1.5rem;
}

.moodboards-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.moodboard-card {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: var(--transition);
}

.moodboard-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.15);
}

.moodboard-preview {
    height: 200px;
    background: #f8f9fa;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2px;
    padding: 10px;
}

.moodboard-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 4px;
}

.moodboard-info {
    padding: 15px;
}

.moodboard-info h3 {
    margin-bottom: 10px;
    color: var(--primary-color);
}

.moodboard-actions {
    display: flex;
    gap: 10px;
    justify-content: flex-end;
    margin-top: 15px;
}

.moodboard-editor {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    padding: 20px;
    margin-bottom: 30px;
}

.editor-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 15px;
}

.editor-header input {
    flex: 1;
    padding: 12px;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1.1rem;
    min-width: 200px;
}

.editor-header input:focus {
    outline: none;
    border-color: var(--secondary-color);
}

.editor-actions {
    display: flex;
    gap: 10px;
}

.editor-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 20px;
    min-height: 400px;
}

.available-images {
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 15px;
    background: #f8f9fa;
    overflow-y: auto;
    max-height: 400px;
}

.available-images h4 {
    margin-bottom: 15px;
    color: var(--primary-color);
}

.available-images .images-grid {
    grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    gap: 10px;
}

.available-images .image-card {
    cursor: grab;
}

.available-images .image-card:active {
    cursor: grabbing;
}

.available-images .image-card img {
    height: 80px;
}

.available-images .image-info {
    display: none;
}

.moodboard-canvas {
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 20px;
    background: white;
    min-height: 400px;
    position: relative;
    background-image: 
        linear-gradient(rgba(0,0,0,0.1) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0,0,0,0.1) 1px, transparent 1px);
    background-size: 20px 20px;
}

.moodboard-canvas.dragover {
    border-color: var(--success-color);
    background-color: rgba(46, 204, 113, 0.05);
}

.moodboard-image {
    position: absolute;
    cursor: move;
    border-radius: 4px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.2);
    transition: transform 0.2s ease;
}

.moodboard-image:hover {
    transform: scale(1.05);
    z-index: 10;
}

.moodboard-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 4px;
    pointer-events: none;
}

.trends-results, .patterns-results {
    display: grid;
    gap: 20px;
}

.trend-card, .pattern-card {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    padding: 20px;
}

.trend-card h3, .pattern-card h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
}

.trend-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
    margin-bottom: 20px;
}

.stat-item {
    text-align: center;
    padding: 15px;
    background: #f8f9fa;
    border-radius: var(--border-radius);
}

.stat-value {
    font-size: 2rem;
    font-weight: bold;
    color: var(--secondary-color);
}

.stat-label {
    color: var(--text-light);
    font-size: 0.9rem;
}

.color-trends {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 15px;
}

.color-trend {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    background: #f8f9fa;
    border-radius: 20px;
}

.pattern-examples {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 15px;
    margin-top: 15px;
}

.pattern-example {
    text-align: center;
}

.pattern-example img {
    width: 100%;
    height: 100px;
    object-fit: cover;
    border-radius: var(--border-radius);
    margin-bottom: 8px;
}

.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    margin-bottom: 15px;
    overflow: hidden;
}

.faq-question {
    width: 100%;
    padding: 20px;
    border: none;
    background: none;
    text-align: left;
    cursor: pointer;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
}

.faq-question:hover {
    background: #f8f9fa;
}

.faq-icon {
    font-size: 1.2rem;
    transition: transform 0.3s ease;
}

.faq-question[aria-expanded="true"] .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    padding: 0 20px;
    max-height: 0;
    overflow: hidden;
    transition: all 0.3s ease;
    background: #f8f9fa;
}

.faq-answer:not([hidden]) {
    padding: 20px;
    max-height: 200px;
}

.faq-answer p {
    color: var(--text-dark);
    line-height: 1.6;
}

.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: white;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-around;
    padding: 10px 0;
    z-index: 1000;
    box-shadow: 0 -2px 10px rgba(0,0,0,0.1);
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    color: var(--text-light);
    transition: var(--transition);
    padding: 5px 10px;
    border-radius: var(--border-radius);
    min-width: 60px;
}

.nav-item:hover {
    color: var(--secondary-color);
    background: rgba(52, 152, 219, 0.1);
}

.nav-item.active {
    color: var(--secondary-color);
    background: rgba(52, 152, 219, 0.1);
}

.nav-item i {
    font-size: 1.2rem;
    margin-bottom: 3px;
}

.nav-item span {
    font-size: 0.7rem;
    font-weight: 500;
}

footer {
    background: var(--primary-color);
    color: white;
    text-align: center;
    padding: 20px;
    margin-top: 40px;
    font-size: 0.9rem;
}

.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid var(--secondary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-light);
}

.empty-state i {
    font-size: 4rem;
    margin-bottom: 20px;
    opacity: 0.5;
}

.empty-state h3 {
    margin-bottom: 10px;
    color: var(--text-dark);
}

@media (max-width: 768px) {
    .app-header h1 {
        font-size: 1.5rem;
    }
    
    .app-main {
        padding: 15px;
    }
    
    .images-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: 15px;
    }
    
    .image-card img {
        height: 120px;
    }
    
    .moodboard-header, .trends-header, .patterns-header {
        flex-direction: column;
        align-items: stretch;
        text-align: center;
    }
    
    .moodboards-container {
        grid-template-columns: 1fr;
    }
    
    .editor-content {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .available-images {
        max-height: 200px;
    }
    
    .trend-stats {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
        gap: 10px;
    }
    
    .stat-value {
        font-size: 1.5rem;
    }
    
    .upload-zone {
        padding: 30px 20px;
    }
    
    .upload-icon {
        font-size: 2rem;
    }
    
    .btn-primary, .btn-secondary, .btn-danger {
        padding: 10px 20px;
        font-size: 0.85rem;
    }
    
    .editor-header {
        flex-direction: column;
    }
    
    .editor-header input {
        min-width: 100%;
    }
    
    .nav-item span {
        font-size: 0.65rem;
    }
}

@media (max-width: 480px) {
    .images-grid {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
        gap: 10px;
    }
    
    .image-card img {
        height: 100px;
    }
    
    .image-info {
        padding: 10px;
    }
    
    .color-palette {
        gap: 3px;
    }
    
    .color-swatch {
        width: 25px;
        height: 25px;
    }
    
    .upload-zone {
        padding: 20px 15px;
    }
    
    .faq-question {
        padding: 15px;
        font-size: 1rem;
    }
    
    .faq-answer:not([hidden]) {
        padding: 15px;
    }
}