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

:root {
    --primary: #4f46e5;
    --primary-dark: #4338ca;
    --secondary: #10b981;
    --danger: #ef4444;
    --danger-dark: #dc2626;
    --background: #f9fafb;
    --surface: #ffffff;
    --text: #1f2937;
    --text-light: #6b7280;
    --border: #e5e7eb;
    --shadow: 0 10px 15px -3px rgba(0,0,0,0.1);
}

body {
    font-family: 'Inter', sans-serif;
    background: var(--background);
    color: var(--text);
    line-height: 1.6;
}

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

/* Header */
.header {
    text-align: center;
    padding: 40px 0;
}

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

.header i {
    margin-right: 10px;
}

.subtitle {
    color: var(--text-light);
    font-size: 1.1rem;
}

/* Upload Section */
.upload-section {
    background: var(--surface);
    border-radius: 15px;
    padding: 30px;
    margin-bottom: 40px;
    box-shadow: var(--shadow);
}

.upload-section h2 {
    margin-bottom: 20px;
    color: var(--text);
}

.upload-area {
    border: 2px dashed var(--border);
    border-radius: 10px;
    padding: 40px;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.3s, background 0.3s;
}

.upload-area:hover,
.upload-area.drag-over {
    border-color: var(--primary);
    background: rgba(79, 70, 229, 0.05);
}

.upload-icon {
    font-size: 48px;
    color: var(--primary);
    margin-bottom: 15px;
}

.file-info {
    margin-top: 15px;
    color: var(--text-light);
    font-size: 0.9rem;
}

/* Buttons */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.3s, transform 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn:hover {
    transform: translateY(-2px);
}

.btn:active {
    transform: translateY(0);
}

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

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

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

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

/* Preview Grid */
.preview-container {
    margin-top: 20px;
}

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

.preview-item {
    position: relative;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.preview-item img {
    width: 100%;
    height: 150px;
    object-fit: cover;
}

.preview-item .preview-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(0,0,0,0.7);
    color: white;
    padding: 8px;
    font-size: 0.8rem;
    text-align: center;
}

.preview-item .remove-preview {
    position: absolute;
    top: 5px;
    right: 5px;
    background: var(--danger);
    color: white;
    width: 25px;
    height: 25px;
    border-radius: 50%;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
}

/* Gallery Section */
.gallery-section {
    background: var(--surface);
    border-radius: 15px;
    padding: 30px;
    box-shadow: var(--shadow);
}

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

.gallery-controls {
    display: flex;
    align-items: center;
    gap: 15px;
}

#imageCount {
    color: var(--text-light);
    font-size: 0.9rem;
}

/* Search Box */
.search-box {
    position: relative;
    margin-bottom: 25px;
}

.search-box input {
    width: 100%;
    padding: 12px 20px 12px 45px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.search-box i {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-light);
}

/* Image Grid */
.image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
}

.image-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    overflow: hidden;
    transition: transform 0.3s, box-shadow 0.3s;
    cursor: pointer;
    position: relative;
}

.image-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow);
}

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

.image-info {
    padding: 15px;
}

.image-info h3 {
    font-size: 0.95rem;
    margin-bottom: 5px;
    color: var(--text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.image-info p {
    font-size: 0.8rem;
    color: var(--text-light);
}

.image-card .download-btn {
    position: absolute;
    bottom: 80px;
    right: 10px;
    background: var(--primary);
    color: white;
    width: 35px;
    height: 35px;
    border-radius: 50%;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s;
}

.image-card:hover .download-btn {
    opacity: 1;
}

/* Empty Gallery */
.empty-gallery {
    grid-column: 1 / -1;
    text-align: center;
    padding: 60px 20px;
    color: var(--text-light);
}

.empty-gallery i {
    font-size: 48px;
    margin-bottom: 15px;
}

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

.modal-content {
    position: relative;
    background: var(--surface);
    margin: 30px auto;
    padding: 20px;
    width: 90%;
    max-width: 900px;
    border-radius: 15px;
    animation: modalSlide 0.3s ease;
}

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

.close-modal {
    position: absolute;
    top: 15px;
    right: 20px;
    font-size: 28px;
    font-weight: bold;
    color: var(--text-light);
    cursor: pointer;
    transition: color 0.3s;
}

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

.modal-body {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.modal-body img {
    width: 100%;
    max-height: 500px;
    object-fit: contain;
    border-radius: 8px;
}

.modal-info {
    padding: 20px;
}

.modal-info h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: var(--text);
}

.modal-info p {
    margin-bottom: 10px;
    color: var(--text);
}

.modal-actions {
    margin-top: 30px;
    display: flex;
    gap: 15px;
}

/* Responsive */
@media (max-width: 768px) {
    .header h1 {
        font-size: 2rem;
    }
    
    .upload-area {
        padding: 20px;
    }
    
    .modal-body {
        grid-template-columns: 1fr;
    }
    
    .gallery-header {
        flex-direction: column;
        align-items: stretch;
    }
    
    .modal-actions {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 10px;
    }
    
    .preview-grid {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    }
    
    .image-grid {
        grid-template-columns: 1fr;
    }
}

/* Loading State */
.loading {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255,255,255,0.9);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 2000;
}

.loading-spinner {
    border: 4px solid var(--border);
    border-top: 4px solid var(--primary);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
    margin-bottom: 15px;
}

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