/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
    line-height: 1.6;
}

.app-container {
    max-width: 1200px;
    margin: 0 auto;
    background: #fff;
    min-height: 100vh;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
}

/* Header Styles */
.header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1rem;
    position: relative;
    overflow: hidden;
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="25" cy="25" r="1" fill="white" opacity="0.1"/><circle cx="75" cy="75" r="1" fill="white" opacity="0.1"/><circle cx="50" cy="10" r="0.5" fill="white" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    opacity: 0.3;
}

.header-content {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0;
}

.header-left {
    display: flex;
    flex-direction: column;
}

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

.app-title {
    font-size: 1.4rem;
    font-weight: 700;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    margin: 0;
}

.app-subtitle {
    font-size: 0.8rem;
    opacity: 0.9;
    margin: 0;
}

.header-icon-btn {
    width: 40px;
    height: 40px;
    border: none;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    color: white;
    cursor: pointer;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.header-icon-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.1);
}

.header-icon-btn.active {
    background: rgba(255, 255, 255, 0.4);
    transform: scale(1.05);
}

.search-container {
    position: relative;
    width: 100%;
    max-width: 500px;
    display: flex;
    gap: 0.4rem;
    align-items: center;
    margin-top: 0.75rem;
}

.search-input {
    flex: 1;
    padding: 0.6rem 0.8rem;
    border: none;
    border-radius: 20px;
    font-size: 0.9rem;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

.search-input:focus {
    outline: none;
    background: white;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    transform: translateY(-2px);
}

.search-close-btn {
    padding: 0.6rem 0.8rem;
    border: none;
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.2);
    color: white;
    cursor: pointer;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    font-size: 0.9rem;
}

.search-close-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
}

/* Navigation Styles */
.nav-tabs {
    display: flex;
    background: #f8f9fa;
    border-bottom: 1px solid #e9ecef;
    padding: 0.5rem 1rem;
    gap: 0.25rem;
    flex-wrap: wrap;
    justify-content: center;
}

.nav-tab {
    padding: 0.5rem 0.75rem;
    border: none;
    background: transparent;
    color: #6c757d;
    cursor: pointer;
    border-radius: 15px;
    font-weight: 500;
    font-size: 0.85rem;
    white-space: nowrap;
    transition: all 0.3s ease;
    position: relative;
    min-width: fit-content;
}

.nav-tab:hover {
    background: rgba(102, 126, 234, 0.1);
    color: #667eea;
    transform: translateY(-1px);
}

.nav-tab.active {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.3);
    transform: translateY(-1px);
}

/* Main Content */
.main-content {
    padding: 1.5rem;
}


/* Articles Grid */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.25rem;
    margin-bottom: 2rem;
}

.article-card {
    background: white;
    border-radius: 12px;
    padding: 1.25rem;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
    transition: all 0.3s ease;
    cursor: pointer;
    border: 1px solid #f0f0f0;
    position: relative;
    overflow: hidden;
    height: fit-content;
}

.article-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.article-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.12);
}

.article-card:hover::before {
    transform: scaleX(1);
}

.article-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.75rem;
    gap: 0.75rem;
}

.article-title {
    font-size: 1.05rem;
    font-weight: 600;
    color: #333;
    margin-bottom: 0.5rem;
    line-height: 1.4;
    flex: 1;
}

.category-badge {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 0.2rem 0.6rem;
    border-radius: 10px;
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    white-space: nowrap;
}

.post-id {
    background: #e9ecef;
    color: #6c757d;
    padding: 0.2rem 0.5rem;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 500;
    white-space: nowrap;
}

.article-preview {
    color: #6c757d;
    font-size: 0.9rem;
    line-height: 1.5;
    margin-bottom: 0.75rem;
    display: -webkit-box;
    -webkit-line-clamp: 4;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
    color: #6c757d;
    margin-top: auto;
}

.read-time {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

/* Enhanced Article Footer */
.article-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 0.75rem;
    padding-top: 0.75rem;
    border-top: 1px solid #f0f0f0;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.article-stats {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.difficulty-badge {
    padding: 0.2rem 0.5rem;
    border-radius: 12px;
    font-size: 0.7rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.difficulty-beginner {
    background: #d4edda;
    color: #155724;
}

.difficulty-intermediate {
    background: #fff3cd;
    color: #856404;
}

.difficulty-advanced {
    background: #f8d7da;
    color: #721c24;
}

.language-badge {
    font-size: 0.8rem;
}

.article-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem;
    align-items: center;
}

.tag {
    background: #e9ecef;
    color: #495057;
    padding: 0.2rem 0.4rem;
    border-radius: 8px;
    font-size: 0.7rem;
    font-weight: 500;
}

.tag-more {
    background: #6c757d;
    color: white;
    padding: 0.2rem 0.4rem;
    border-radius: 8px;
    font-size: 0.7rem;
    font-weight: 500;
}

/* Modal Metadata */
.modal-metadata {
    background: #f8f9fa;
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 1rem;
    border: 1px solid #e9ecef;
}

.modal-meta-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.meta-item {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.meta-label {
    font-size: 0.75rem;
    color: #6c757d;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.meta-value {
    font-size: 0.9rem;
    color: #333;
    font-weight: 600;
}

.modal-tags {
    margin-bottom: 1rem;
}

.tags-container {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.key-points {
    margin-top: 1rem;
}

.key-points ul {
    margin: 0.5rem 0 0 1rem;
    padding: 0;
}

.key-points li {
    margin-bottom: 0.25rem;
    color: #495057;
    font-size: 0.9rem;
}

/* Error Message */
.error-message {
    text-align: center;
    padding: 3rem 1rem;
    color: #dc3545;
    grid-column: 1 / -1;
}

.error-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.7;
}

.error-message h3 {
    margin-bottom: 0.5rem;
    color: #dc3545;
}

/* No Results */
.no-results {
    text-align: center;
    padding: 3rem 1rem;
    color: #6c757d;
}

.no-results-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.no-results h3 {
    margin-bottom: 0.5rem;
    color: #333;
}

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

/* About Modal Styles */
.about-content {
    max-height: 70vh;
    overflow-y: auto;
}

.about-section {
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid #e9ecef;
}

.about-section:last-child {
    border-bottom: none;
    margin-bottom: 0;
}

.about-section h3 {
    color: #667eea;
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.about-section p {
    color: #6c757d;
    line-height: 1.6;
    margin: 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-top: 0.5rem;
}

.stat-item {
    text-align: center;
    padding: 0.75rem;
    background: #f8f9fa;
    border-radius: 8px;
    border: 1px solid #e9ecef;
}

.stat-number {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: #667eea;
    margin-bottom: 0.25rem;
}

.stat-label {
    font-size: 0.8rem;
    color: #6c757d;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.tech-info {
    background: #f8f9fa;
    padding: 1rem;
    border-radius: 8px;
    border: 1px solid #e9ecef;
}

.tech-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
    border-bottom: 1px solid #e9ecef;
}

.tech-item:last-child {
    border-bottom: none;
}

.tech-label {
    font-weight: 600;
    color: #495057;
}

.tech-value {
    color: #667eea;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
}

.connect-links {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.connect-link {
    display: inline-flex;
    align-items: center;
    padding: 0.5rem 1rem;
    background: #667eea;
    color: white;
    text-decoration: none;
    border-radius: 20px;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.connect-link:hover {
    background: #5a6fd8;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.modal.show {
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s ease;
}

.modal-content {
    background: white;
    border-radius: 20px;
    max-width: 90vw;
    max-height: 90vh;
    width: 600px;
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    animation: slideUp 0.3s ease;
}

.modal-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    font-size: 1.3rem;
    font-weight: 600;
    margin: 0;
}

.close-btn {
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    transition: background 0.3s ease;
}

.close-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

.modal-body {
    padding: 1.5rem;
    max-height: 60vh;
    overflow-y: auto;
}

.article-meta {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.article-content {
    white-space: pre-wrap;
    line-height: 1.6;
    color: #333;
}

.modal-footer {
    padding: 1.5rem;
    border-top: 1px solid #e9ecef;
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
}

.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: #f8f9fa;
    color: #6c757d;
    border: 1px solid #e9ecef;
}

.btn-secondary:hover {
    background: #e9ecef;
    color: #495057;
}

/* Loading Spinner */
.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 3rem;
    color: #6c757d;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 1rem;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .header {
        padding: 0.75rem;
    }
    
    .app-title {
        font-size: 1.2rem;
    }
    
    .app-subtitle {
        font-size: 0.75rem;
    }
    
    .nav-tabs {
        padding: 0.5rem;
        gap: 0.25rem;
    }
    
    .nav-tab {
        padding: 0.4rem 0.6rem;
        font-size: 0.8rem;
    }
    
    .articles-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    
    
    .main-content {
        padding: 1rem;
    }
    
    .modal-content {
        width: 95vw;
        max-height: 95vh;
    }
    
    .modal-footer {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .header {
        padding: 0.6rem;
    }
    
    .app-title {
        font-size: 1.1rem;
    }
    
    .search-container {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .search-input {
        width: 100%;
    }
    
    .search-btn, .sort-btn {
        width: 100%;
        justify-content: center;
    }
    
    .main-content {
        padding: 0.75rem;
    }
    
    .article-card {
        padding: 1rem;
    }
    
    .nav-tabs {
        flex-wrap: wrap;
        justify-content: flex-start;
    }
    
    .article-footer {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
    }
    
    .article-stats {
        justify-content: flex-start;
    }
    
    .modal-meta-grid {
        grid-template-columns: 1fr;
    }
    
    .tags-container {
        justify-content: flex-start;
    }
}

/* Telegram Mini App Specific Styles */
.tg-viewport {
    height: 100vh;
    overflow: hidden;
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    body {
        background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    }
    
    .app-container {
        background: #1a1a2e;
        color: #e0e0e0;
    }
    
    .article-card {
        background: #2d2d44;
        border-color: #3d3d5c;
        color: #e0e0e0;
    }
    
    .article-title {
        color: #e0e0e0;
    }
    
    .nav-tabs {
        background: #2d2d44;
        border-color: #3d3d5c;
    }
    
}