/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Light theme variables */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --accent-primary: #007bff;
    --accent-secondary: #6c757d;
    --accent-success: #28a745;
    --accent-danger: #dc3545;
    --accent-warning: #ffc107;
    --border-color: #dee2e6;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 20px rgba(0, 0, 0, 0.15);
}

[data-theme="dark"] {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-tertiary: #3d3d3d;
    --text-primary: #ffffff;
    --text-secondary: #adb5bd;
    --border-color: #495057;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 4px 20px rgba(0, 0, 0, 0.4);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Header styles */
.header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
}

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

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

.logo i {
    font-size: 2rem;
}

.nav {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.search-container {
    position: relative;
}

.search-input {
    padding: 0.5rem 2.5rem 0.5rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 25px;
    background: var(--bg-primary);
    color: var(--text-primary);
    width: 250px;
    transition: all 0.3s ease;
}

.search-input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.1);
}

.search-icon {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
}

.nav-buttons {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.btn {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

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

.btn-primary:hover {
    background: #0056b3;
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

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

.btn-icon {
    padding: 0.5rem;
    background: transparent;
    color: var(--text-secondary);
}

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

.auth-buttons {
    display: flex;
    gap: 0.5rem;
}

.user-menu {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--accent-primary);
}

.user-dropdown {
    position: relative;
}

.dropdown-content {
    position: absolute;
    top: 100%;
    right: 0;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 0.5rem;
    min-width: 150px;
    box-shadow: var(--shadow-lg);
    display: none;
    z-index: 1000;
}

.user-dropdown:hover .dropdown-content {
    display: block;
}

.dropdown-content a {
    display: block;
    padding: 0.5rem;
    color: var(--text-primary);
    text-decoration: none;
    border-radius: 4px;
}

.dropdown-content a:hover {
    background: var(--bg-tertiary);
}

/* Main content */
.main {
    min-height: calc(100vh - 200px);
    padding: 2rem 0;
}

/* Gallery section */
.gallery-section {
    padding: 2rem 0;
}

.filters {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.filter-select {
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-width: 150px;
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.gallery-item {
    background: var(--bg-secondary);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    cursor: pointer;
}

.gallery-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.gallery-image {
    width: 100%;
    height: 250px;
    object-fit: cover;
}

.gallery-info {
    padding: 1rem;
}

.gallery-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.gallery-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.gallery-actions {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.load-more {
    text-align: center;
    margin-top: 2rem;
}

.loading {
    text-align: center;
    padding: 2rem;
    color: var(--text-secondary);
    font-style: italic;
}

/* Modal styles */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 2000;
    backdrop-filter: blur(5px);
}

.modal-content {
    background: var(--bg-primary);
    border-radius: 12px;
    padding: 2rem;
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    position: relative;
}

.close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
}

.close:hover {
    color: var(--text-primary);
}

.auth-tabs {
    display: flex;
    gap: 0;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.tab-btn {
    padding: 0.75rem 1.5rem;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    border-bottom: 2px solid transparent;
}

.tab-btn.active {
    color: var(--accent-primary);
    border-bottom-color: var(--accent-primary);
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.auth-form input {
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 1rem;
}

.auth-form input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.1);
}

/* Upload form styles */
.upload-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.file-dropzone {
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.file-dropzone:hover {
    border-color: var(--accent-primary);
    background: var(--bg-tertiary);
}

.file-dropzone i {
    font-size: 3rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.image-preview {
    margin-top: 1rem;
}

.image-preview img {
    max-width: 100%;
    max-height: 200px;
    border-radius: 8px;
}

/* Image modal styles */
.image-modal .modal-content {
    max-width: 900px;
    padding: 0;
}

.image-detail {
    display: grid;
    grid-template-columns: 1fr 1fr;
    min-height: 500px;
}

.image-detail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.image-info {
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.image-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    gap: 1rem;
}

.image-actions {
    display: flex;
    gap: 0.5rem;
}

.image-meta {
    display: flex;
    gap: 1rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

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

.stars {
    display: flex;
    gap: 0.25rem;
}

.stars i {
    color: var(--accent-warning);
    cursor: pointer;
    transition: color 0.2s ease;
}

.stars i:hover {
    color: #ffd700;
}

.comments-section {
    margin-top: 1rem;
}

.comments-list {
    max-height: 200px;
    overflow-y: auto;
    margin-bottom: 1rem;
}

.comment {
    padding: 0.75rem;
    background: var(--bg-secondary);
    border-radius: 6px;
    margin-bottom: 0.5rem;
}

.comment-form {
    display: flex;
    gap: 0.5rem;
}

.comment-form textarea {
    flex: 1;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    resize: vertical;
    min-height: 60px;
    background: var(--bg-primary);
    color: var(--text-primary);
}

/* Footer */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
    text-align: center;
    color: var(--text-secondary);
}

/* Utility classes */
.hidden {
    display: none !important;
}

.visible {
    display: block !important;
}

/* Responsive design */
@media (max-width: 768px) {
    .container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav {
        width: 100%;
        justify-content: space-between;
    }
    
    .search-input {
        width: 200px;
    }
    
    .gallery-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
        gap: 1rem;
    }
    
    .image-detail {
        grid-template-columns: 1fr;
    }
    
    .modal-content {
        margin: 1rem;
        width: calc(100% - 2rem);
    }
    
    .filters {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .search-input {
        width: 150px;
    }
    
    .gallery-grid {
        grid-template-columns: 1fr;
    }
    
    .auth-buttons {
        flex-direction: column;
    }
    
    .image-header {
        flex-direction: column;
    }
}

/* Animation classes */
.fade-in {
    animation: fadeIn 0.3s ease-in;
}

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

.slide-in {
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from {
        transform: translateX(-100%);
    }
    to {
        transform: translateX(0);
    }
}

/* Loading animation */
.loading-spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border-color);
    border-top: 4px solid var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 2rem auto;
}

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

/* Error states */
.error {
    color: var(--accent-danger);
    font-size: 0.9rem;
    margin-top: 0.25rem;
}

.input-error {
    border-color: var(--accent-danger) !important;
}

.input-error:focus {
    box-shadow: 0 0 0 3px rgba(220, 53, 69, 0.1) !important;
}

/* Success states */
.success {
    color: var(--accent-success);
    font-size: 0.9rem;
    margin-top: 0.25rem;
}

/* Focus styles for accessibility */
.btn:focus,
input:focus,
textarea:focus,
select:focus {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000000;
        --shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}