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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

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

/* Header Styles */
.header {
    text-align: center;
    margin-bottom: 40px;
    color: white;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-bottom: 10px;
}

.logo i {
    font-size: 2.5rem;
    color: #ffd700;
}

.logo h1 {
    font-size: 2.5rem;
    font-weight: 700;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
    font-weight: 300;
}

/* Search Section */
.search-section {
    background: white;
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    margin-bottom: 30px;
}

.search-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 25px;
    border-bottom: 2px solid #f0f0f0;
}

.tab-btn {
    background: none;
    border: none;
    padding: 12px 20px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    color: #666;
    border-bottom: 3px solid transparent;
    transition: all 0.3s ease;
    border-radius: 8px 8px 0 0;
}

.tab-btn:hover {
    background: #f8f9fa;
    color: #333;
}

.tab-btn.active {
    color: #667eea;
    border-bottom-color: #667eea;
    background: #f8f9fa;
}

.search-input-group {
    display: flex;
    gap: 15px;
    margin-bottom: 20px;
}

#searchInput {
    flex: 1;
    padding: 15px 20px;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    font-size: 1.1rem;
    transition: border-color 0.3s ease;
}

#searchInput:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.search-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 15px 30px;
    border-radius: 10px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}

.search-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

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

.filter-section {
    display: flex;
    gap: 30px;
    flex-wrap: wrap;
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.filter-group label {
    font-weight: 600;
    color: #555;
    font-size: 0.9rem;
}

.filter-group select {
    padding: 10px 15px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 1rem;
    background: white;
    cursor: pointer;
    transition: border-color 0.3s ease;
}

.filter-group select:focus {
    outline: none;
    border-color: #667eea;
}

/* Results Section */
.results-section {
    background: white;
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    margin-bottom: 30px;
}

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 2px solid #f0f0f0;
}

.results-count {
    font-size: 1.1rem;
    font-weight: 600;
    color: #667eea;
}

.view-options {
    display: flex;
    gap: 5px;
}

.view-btn {
    background: #f8f9fa;
    border: 2px solid #e0e0e0;
    padding: 10px 15px;
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.3s ease;
    color: #666;
}

.view-btn:hover {
    background: #e9ecef;
    border-color: #667eea;
}

.view-btn.active {
    background: #667eea;
    border-color: #667eea;
    color: white;
}

/* Loading Spinner */
.loading-spinner {
    text-align: center;
    padding: 40px;
    color: #667eea;
}

.loading-spinner i {
    font-size: 2rem;
    margin-bottom: 15px;
    display: block;
}

.loading-spinner span {
    font-size: 1.1rem;
    font-weight: 500;
}

/* No Results */
.no-results {
    text-align: center;
    padding: 60px 20px;
    color: #666;
}

.no-results i {
    font-size: 4rem;
    color: #ddd;
    margin-bottom: 20px;
    display: block;
}

.no-results h3 {
    font-size: 1.5rem;
    margin-bottom: 10px;
    color: #555;
}

.no-results p {
    font-size: 1.1rem;
    opacity: 0.8;
}

/* Results Container */
.results-container {
    min-height: 200px;
}

/* Song Item Styles */
.song-item {
    background: #f8f9fa;
    border: 1px solid #e9ecef;
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 15px;
    transition: all 0.3s ease;
    cursor: pointer;
}

.song-item:hover {
    background: #e9ecef;
    border-color: #667eea;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.song-item.grid-view {
    display: inline-block;
    width: calc(33.333% - 10px);
    margin-right: 15px;
    vertical-align: top;
}

.song-item.grid-view:nth-child(3n) {
    margin-right: 0;
}

.song-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 10px;
}

.song-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: #333;
    margin-bottom: 5px;
    line-height: 1.3;
}

.song-code {
    background: #667eea;
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
    white-space: nowrap;
}

.song-author {
    color: #666;
    font-size: 1rem;
    margin-bottom: 8px;
    font-weight: 500;
}

.song-intro {
    color: #777;
    font-size: 0.95rem;
    line-height: 1.4;
    margin-bottom: 10px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.song-meta {
    display: flex;
    gap: 15px;
    font-size: 0.9rem;
    color: #888;
}

.song-meta span {
    display: flex;
    align-items: center;
    gap: 5px;
}

.song-meta i {
    color: #667eea;
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    margin-top: 30px;
    padding-top: 20px;
    border-top: 2px solid #f0f0f0;
}

.page-btn {
    background: #f8f9fa;
    border: 2px solid #e0e0e0;
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    color: #666;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}

.page-btn:hover:not(:disabled) {
    background: #667eea;
    border-color: #667eea;
    color: white;
}

.page-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.page-numbers {
    display: flex;
    gap: 5px;
}

.page-number {
    background: #f8f9fa;
    border: 2px solid #e0e0e0;
    padding: 10px 15px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    color: #666;
    transition: all 0.3s ease;
    min-width: 45px;
    text-align: center;
}

.page-number:hover {
    background: #667eea;
    border-color: #667eea;
    color: white;
}

.page-number.active {
    background: #667eea;
    border-color: #667eea;
    color: white;
}

/* Footer */
.footer {
    text-align: center;
    color: white;
    opacity: 0.8;
    font-size: 0.9rem;
    margin-top: 40px;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    .logo h1 {
        font-size: 2rem;
    }
    
    .search-section {
        padding: 20px;
    }
    
    .search-input-group {
        flex-direction: column;
    }
    
    .filter-section {
        flex-direction: column;
        gap: 15px;
    }
    
    .results-header {
        flex-direction: column;
        gap: 15px;
        align-items: stretch;
    }
    
    .song-item.grid-view {
        width: 100%;
        margin-right: 0;
    }
    
    .song-header {
        flex-direction: column;
        gap: 10px;
        align-items: flex-start;
    }
    
    .pagination {
        flex-wrap: wrap;
    }
    
    .page-numbers {
        order: -1;
        width: 100%;
        justify-content: center;
        margin-bottom: 10px;
    }
}

@media (max-width: 480px) {
    .logo {
        flex-direction: column;
        gap: 10px;
    }
    
    .logo h1 {
        font-size: 1.8rem;
    }
    
    .search-tabs {
        flex-wrap: wrap;
    }
    
    .tab-btn {
        flex: 1;
        min-width: calc(50% - 5px);
    }
    
    .song-meta {
        flex-direction: column;
        gap: 8px;
    }
}

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

.song-item {
    animation: fadeIn 0.3s ease;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: #667eea;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #5a6fd8;
}