/* CSS Variables for Theming */
:root {
    /* Color Variables */
    --color-primary: #667eea;
    --color-primary-dark: #764ba2;
    --color-secondary: #28a745;
    --color-accent: #ffd700;
    --color-accent-dark: #e6c200;
    --color-text-primary: #333;
    --color-text-secondary: #6c757d;
    --color-text-dark: #2d3748;
    --color-text-light: #495057;
    --color-background: #f8f9fa;
    --color-surface: #ffffff;
    --color-border: #e9ecef;
    --color-border-focus: var(--color-primary);
    --color-hover-bg: rgba(255, 255, 255, 0.2);
    --color-hover-border: rgba(255, 255, 255, 0.3);
    --color-modal-backdrop: rgba(0, 0, 0, 0.8);
    --color-shadow: rgba(0, 0, 0, 0.1);
    --color-shadow-hover: rgba(0, 0, 0, 0.15);
    
    /* Spacing Variables */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;
    
    /* Typography */
    --font-size-base: 1rem;
    --font-size-sm: 0.9rem;
    --font-size-lg: 1.1rem;
    --font-size-xl: 1.3rem;
    --font-size-xxl: 1.5rem;
    --font-size-hero: 2rem;
    
    /* Border Radius */
    --border-radius-sm: 0.5rem;
    --border-radius-md: 0.75rem;
    --border-radius-lg: 1rem;
    --border-radius-xl: 1.5rem;
    --border-radius-pill: 25px;
    --border-radius-circle: 50%;
    
    /* Shadows */
    --shadow-sm: 0 2px 10px var(--color-shadow);
    --shadow-md: 0 4px 15px var(--color-shadow);
    --shadow-lg: 0 8px 25px var(--color-shadow-hover);
    --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.3);
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    --gradient-accent: linear-gradient(135deg, #fff9e6 0%, var(--color-surface) 100%);
}

/* CSS 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;
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-background);
    font-size: var(--font-size-base);
}

/* Header */
.header {
    background: var(--gradient-primary);
    color: var(--color-surface);
    padding: var(--spacing-md) var(--spacing-xl);
    box-shadow: var(--shadow-sm);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header h1 {
    font-size: var(--font-size-hero);
    font-weight: 700;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.header-controls {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

.bookmark-toggle-btn {
    background: var(--color-hover-bg);
    color: var(--color-surface);
    border: 2px solid var(--color-hover-border);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-pill);
    cursor: pointer;
    font-size: var(--font-size-sm);
    font-weight: 500;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.bookmark-toggle-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-2px);
}

.export-bookmarks-btn {
    background: var(--color-accent);
    color: var(--color-surface);
    border: 2px solid var(--color-accent);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-pill);
    cursor: pointer;
    font-size: var(--font-size-sm);
    font-weight: 500;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.export-bookmarks-btn:hover {
    background: var(--color-accent-dark);
    border-color: var(--color-accent-dark);
    transform: translateY(-2px);
}

.import-bookmarks-btn {
    background: var(--color-secondary);
    color: var(--color-surface);
    border: 2px solid var(--color-secondary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-pill);
    cursor: pointer;
    font-size: var(--font-size-sm);
    font-weight: 500;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.import-bookmarks-btn:hover {
    background: #218838;
    border-color: #218838;
    transform: translateY(-2px);
}

.export-icon, .import-icon {
    font-size: 1rem;
}

/* Main Content */
.main {
    max-width: 87.5rem; /* 1400px */
    margin: 0 auto;
    padding: var(--spacing-xl);
}

/* Search */
.search-container {
    margin-bottom: var(--spacing-xl);
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    align-items: center;
    flex-wrap: wrap;
}

.search-input-wrapper {
    position: relative;
    flex: 1;
    max-width: 25rem; /* 400px */
    min-width: 15.625rem; /* 250px */
}

.search-input {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-xxl) var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-lg);
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius-pill);
    background: var(--color-surface);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.search-input:focus {
    outline: none;
    border-color: var(--color-border-focus);
    box-shadow: 0 4px 20px rgba(102, 126, 234, 0.2);
}

.clear-search-btn {
    position: absolute;
    right: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    cursor: pointer;
    padding: 0;
    border-radius: var(--border-radius-circle);
    width: var(--spacing-xl);
    height: var(--spacing-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
    line-height: 1;
}

.clear-search-btn span {
    display: block;
    line-height: 1;
    font-weight: normal;
}

.clear-search-btn:hover {
    background: var(--color-background);
    color: var(--color-text-light);
    transform: translateY(-50%) scale(1.1);
}

.clear-search-btn:active {
    transform: translateY(-50%) scale(0.95);
}

.sort-select,
.random-btn {
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-lg);
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius-pill);
    background: var(--color-surface);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    cursor: pointer;
    font-weight: 500;
}

.sort-select {
    min-width: 10rem; /* 160px */
    color: var(--color-text-light);
}

.sort-select:focus,
.sort-select:hover {
    outline: none;
    border-color: var(--color-border-focus);
}

.sort-select:focus {
    box-shadow: 0 4px 20px rgba(102, 126, 234, 0.2);
}

.controls-group {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
    flex-wrap: wrap;
}

.random-btn {
    border-color: var(--color-secondary);
    color: var(--color-secondary);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    white-space: nowrap;
}

.random-btn:hover {
    background: var(--color-secondary);
    color: var(--color-surface);
    box-shadow: 0 4px 20px rgba(40, 167, 69, 0.3);
    transform: translateY(-2px);
}

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

/* Songs Grid */
.songs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(18.75rem, 1fr)); /* 300px */
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xxl);
}

.song-card {
    background: var(--color-surface);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    cursor: pointer;
    overflow: hidden;
    position: relative;
    border: 2px solid transparent;
}

.song-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary);
}

.song-card.bookmarked {
    border-color: var(--color-accent);
    background: var(--gradient-accent);
}

.song-card-content {
    padding: var(--spacing-lg);
    position: relative;
}

.song-id {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
}

.song-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-text-dark);
    margin-bottom: var(--spacing-md);
    line-height: 1.4;
    min-height: 3.6rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.view-btn {
    background: var(--gradient-primary);
    color: var(--color-surface);
    border: none;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius-md);
    cursor: pointer;
    font-size: var(--font-size-base);
    font-weight: 500;
    transition: all var(--transition-normal);
}

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

.bookmark-btn {
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-circle);
    cursor: pointer;
    font-size: 1.2rem;
    transition: all var(--transition-normal);
    width: 2.5rem; /* 40px */
    height: 2.5rem; /* 40px */
    display: flex;
    align-items: center;
    justify-content: center;
}

.bookmark-btn:hover {
    border-color: var(--color-accent);
    background: #fff9e6;
    transform: scale(1.1);
}

.bookmark-btn.bookmarked {
    border-color: var(--color-accent);
    background: var(--color-accent);
    color: var(--color-surface);
}

.bookmark-icon {
    font-size: 1.2rem;
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.page-btn {
    background: var(--gradient-primary);
    color: var(--color-surface);
    border: none;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius-md);
    cursor: pointer;
    font-size: var(--font-size-base);
    font-weight: 500;
    transition: all var(--transition-normal);
}

.page-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.page-btn:disabled {
    background: var(--color-border);
    color: var(--color-text-secondary);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.page-info {
    font-size: var(--font-size-lg);
    font-weight: 500;
    color: var(--color-text-light);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.page-input {
    width: 3.75rem; /* 60px */
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-base);
    font-weight: 500;
    text-align: center;
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius-md);
    background: var(--color-surface);
    color: var(--color-text-light);
    transition: all var(--transition-normal);
}

.page-input:focus,
.page-input:hover {
    outline: none;
    border-color: var(--color-border-focus);
}

.page-input:focus {
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: var(--color-modal-backdrop);
    backdrop-filter: blur(5px);
    overflow-y: auto;
    padding: var(--spacing-xl) 0 4rem 0;
}

.modal.active {
    display: block;
}

.modal-content {
    background: var(--color-surface);
    border-radius: var(--border-radius-xl);
    max-width: 95vw;
    width: auto;
    height: auto;
    box-shadow: var(--shadow-xl);
    overflow: visible;
    display: flex;
    flex-direction: column;
    max-height: none;
    margin: var(--spacing-xl) auto;
    position: relative;
    animation: modalContentFadeIn var(--transition-normal);
}

.modal-header {
    padding: var(--spacing-lg) var(--spacing-xl);
    background: var(--gradient-primary);
    color: var(--color-surface);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    font-size: var(--font-size-xxl);
    font-weight: 600;
}

.modal-controls {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

.close-btn {
    background: none;
    border: none;
    color: var(--color-surface);
    font-size: var(--spacing-xl);
    cursor: pointer;
    width: 2.5rem; /* 40px */
    height: 2.5rem; /* 40px */
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--border-radius-circle);
    transition: all var(--transition-normal);
}

.close-btn:hover {
    background: var(--color-hover-bg);
    transform: scale(1.1);
}

.modal-body {
    padding: var(--spacing-xl) var(--spacing-xl) 4rem var(--spacing-xl);
    overflow: hidden; /* Prevent body overflow, let svg-container handle scrolling */
    flex: 1;
}

.svg-container {
    display: flex;
    justify-content: center; /* Center on desktop */
    align-items: flex-start;
    min-height: 12.5rem; /* 200px */
    overflow: auto;
    width: 100%;
    /* Add subtle scrollbar styling */
    scrollbar-width: thin;
    scrollbar-color: var(--color-border) transparent;
    /* Ensure touch scrolling works on mobile */
    -webkit-overflow-scrolling: touch;
}

.svg-container::-webkit-scrollbar {
    height: 8px;
    width: 8px;
}

.svg-container::-webkit-scrollbar-track {
    background: transparent;
}

.svg-container::-webkit-scrollbar-thumb {
    background-color: var(--color-border);
    border-radius: var(--border-radius-sm);
}

.svg-container::-webkit-scrollbar-thumb:hover {
    background-color: var(--color-text-secondary);
}

.svg-container svg {
    /* Allow horizontal scrolling when needed but fit to container when possible */
    max-width: 100%;
    width: auto;
    border-radius: var(--border-radius-md);
    box-shadow: 0 4px 20px var(--color-shadow);
    display: block;
    height: auto;
    /* Ensure SVG doesn't shrink below its natural size */
    min-width: fit-content;
    flex-shrink: 0;
}

/* Animations */
@keyframes modalContentFadeIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes fadeOut {
    to {
        opacity: 0;
        transform: scale(0.8);
    }
}

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

.show-block {
    display: block !important;
}

.show-flex {
    display: flex !important;
}

/* Message Classes */
.empty-state-message {
    grid-column: 1/-1;
    text-align: center;
    padding: var(--spacing-xxl);
    color: var(--color-text-secondary);
}

.loading-message {
    text-align: center;
    padding: var(--spacing-xl);
}

.error-message {
    text-align: center;
    padding: var(--spacing-xl);
    color: #dc3545;
}

.error-message-grid {
    grid-column: 1/-1;
    text-align: center;
    padding: var(--spacing-xxl);
    color: #dc3545;
}

.fade-out-animation {
    animation: fadeOut 0.3s ease forwards;
}

/* Responsive Design */
@media (max-width: 48rem) { /* 768px */
    .header {
        flex-direction: column;
        text-align: center;
        padding: var(--spacing-md);
    }
    
    .header h1 {
        font-size: 1.7rem;
    }
    
    .main {
        padding: var(--spacing-md);
    }
    
    .search-container {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .search-input-wrapper,
    .search-input {
        width: 100%;
        max-width: none;
        min-width: auto;
    }
    
    .controls-group {
        width: 100%;
        justify-content: center;
    }
    
    .sort-select,
    .random-btn {
        flex: 1;
        min-width: 7.5rem; /* 120px */
        max-width: none;
        text-align: center;
    }
    
    .songs-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .pagination {
        flex-direction: column;
        gap: var(--spacing-md);
        align-items: center;
    }
    
    .page-info {
        order: -1;
        font-size: var(--font-size-base);
    }
    
    .page-input {
        width: 3.125rem; /* 50px */
    }
    
    .modal {
        padding: var(--spacing-md) 0 var(--spacing-xxl) 0;
    }
    
    .modal-content {
        margin: var(--spacing-md) auto;
        max-width: calc(100vw - var(--spacing-md));
        max-height: none;
    }
    
    .modal-header {
        padding: var(--spacing-md);
    }
    
    .modal-body {
        padding: var(--spacing-md) var(--spacing-md) var(--spacing-xxl) var(--spacing-md);
        overflow: hidden; /* Prevent body overflow, let svg-container handle scrolling */
    }
    
    .svg-container {
        /* Override desktop centering for mobile scrolling */
        justify-content: flex-start;
        width: 100%;
        max-height: 70vh; /* Limit height to prevent modal from being too tall */
        overflow: auto;
        /* Better touch scrolling on mobile */
        -webkit-overflow-scrolling: touch;
    }
    
    .svg-container svg {
        /* Force SVG to maintain its original size and allow horizontal scrolling */
        max-width: none;
        width: auto;
        min-width: auto;
        height: auto;
        /* Ensure the SVG can be larger than the container */
        flex-shrink: 0;
    }
}

@media (max-width: 30rem) { /* 480px */
    .song-card-content {
        padding: var(--spacing-md);
    }
    
    .song-title {
        font-size: var(--font-size-lg);
    }
    
    .card-actions {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .view-btn {
        width: 100%;
    }
    
    /* Additional mobile optimizations for very small screens */
    .modal-content {
        margin: var(--spacing-xs) auto;
        max-width: calc(100vw - var(--spacing-xs));
        border-radius: var(--border-radius-md);
    }
    
    .modal-header {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .modal-header h2 {
        font-size: var(--font-size-xl);
        line-height: 1.3;
    }
    
    .modal-body {
        padding: var(--spacing-sm) var(--spacing-sm) var(--spacing-xl) var(--spacing-sm);
    }
    
    .svg-container {
        max-height: 60vh; /* Smaller height on very small screens */
        min-height: 10rem;
    }
}

/* Footer Styles */
.footer {
    background-color: var(--color-background);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-xl) var(--spacing-md);
    margin-top: var(--spacing-xxl);
    text-align: center;
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

.footer p {
    margin: var(--spacing-sm) 0;
    line-height: 1.5;
}

.footer a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

.footer a:hover {
    color: var(--color-primary-dark);
    text-decoration: underline;
}