/* Enhanced Mobile-First CSS for Music Streaming App */

/* CSS Variables for consistent theming */
:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --light-bg: #f8f9fa;
    --white: #ffffff;
    --dark: #333333;
    --border-color: #e9ecef;
    --shadow: 0 2px 10px rgba(0,0,0,0.1);
    --shadow-hover: 0 4px 20px rgba(0,0,0,0.15);
    --transition: all 0.3s ease;
    --border-radius: 8px;
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

body {
    font-family: var(--font-family);
    font-size: 14px;
    line-height: 1.5;
    color: var(--dark);
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
    padding-bottom: 70px;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 10px;
}

/* Header/Navigation Styles */
.current-path {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--white);
    padding: 15px;
    font-weight: 600;
    font-size: 16px;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
    text-align: center;
    text-shadow: 1px 1px 2px rgba(0,0,0,0.3);
}

.breadcrumb {
    background: var(--white);
    padding: 12px 15px;
    font-size: 13px;
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.breadcrumb a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
    font-weight: 500;
}

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

.breadcrumb span {
    color: var(--secondary-color);
    margin: 0 5px;
}

/* Navigation Section */
.nav-section {
    background: var(--white);
    padding: 12px 15px;
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.nav-section a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    padding: 8px 12px;
    border-radius: var(--border-radius);
    transition: var(--transition);
    display: inline-block;
}

.nav-section a:hover {
    background: var(--light-bg);
    color: var(--dark);
}

/* Content Cards */
.bg {
    background: var(--white);
    margin-bottom: 8px;
    padding: 15px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
    border-left: 4px solid transparent;
}

.bg:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
    border-left-color: var(--primary-color);
}

/* Table Layouts */
.bg table {
    width: 100%;
    border-collapse: collapse;
}

.bg td {
    vertical-align: top;
    padding: 5px;
}

/* Image Styles */
.img {
    border-radius: var(--border-radius);
    object-fit: cover;
    transition: var(--transition);
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.img:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

/* Folder Info Display */
.folder-info {
    background: var(--white);
    margin: 15px 0;
    padding: 20px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.folder-info h3 {
    color: var(--dark);
    margin-bottom: 10px;
    font-size: 18px;
}

.folder-info p {
    margin-bottom: 8px;
    font-size: 14px;
    line-height: 1.4;
}

.folder-info a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.folder-info a:hover {
    text-decoration: underline;
}

/* Audio Player Button */
.sm2_button {
    display: inline-block;
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--success-color), #20c997);
    border-radius: 50%;
    text-align: center;
    line-height: 32px;
    color: var(--white);
    text-decoration: none;
    margin-right: 10px;
    transition: var(--transition);
    box-shadow: 0 2px 8px rgba(40, 167, 69, 0.3);
    position: relative;
    overflow: hidden;
}

.sm2_button:before {
    content: "▶";
    font-size: 12px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.sm2_button:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 15px rgba(40, 167, 69, 0.4);
}

/* Links */
a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

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

/* Singers Info */
.singers-info {
    margin-top: 8px;
    padding-top: 8px;
    border-top: 1px solid var(--border-color);
}

.singers-info small {
    color: var(--secondary-color);
    font-size: 12px;
    line-height: 1.3;
}

.singers-info a {
    color: var(--primary-color);
    font-weight: 500;
}

/* Download Page Styles */
.info {
    background: var(--light-bg);
    padding: 15px;
    border-radius: var(--border-radius);
    margin: 15px 0;
    border-left: 4px solid var(--primary-color);
}

.download-options {
    background: var(--white);
    padding: 20px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    margin: 20px 0;
}

.download-options h3 {
    color: var(--dark);
    margin-bottom: 15px;
    font-size: 16px;
}

.download-options a {
    display: block;
    margin: 8px 0;
    padding: 12px 15px;
    background: linear-gradient(135deg, var(--primary-color), #0056b3);
    color: var(--white);
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    text-align: center;
    box-shadow: 0 2px 8px rgba(0, 123, 255, 0.3);
}

.download-options a:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 123, 255, 0.4);
    color: var(--white);
}

/* ZIP Download Buttons */
.zip-btn {
    display: inline-block;
    margin: 3px 5px 3px 0;
    padding: 6px 12px;
    background: linear-gradient(135deg, var(--success-color), #20c997);
    color: var(--white);
    font-size: 12px;
    border-radius: 15px;
    text-decoration: none;
    transition: var(--transition);
    font-weight: 500;
    box-shadow: 0 2px 8px rgba(40, 167, 69, 0.2);
}

.zip-btn:hover {
    background: linear-gradient(135deg, #20c997, var(--success-color));
    color: var(--white);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(40, 167, 69, 0.3);
}

.zip-create-btn {
    display: inline-block;
    margin: 5px 0;
    padding: 5px 12px;
    background: var(--secondary-color);
    color: var(--white);
    font-size: 11px;
    border-radius: 12px;
    text-decoration: none;
    transition: var(--transition);
}

.zip-create-btn:hover {
    background: #5a6268;
    color: var(--white);
    transform: translateY(-1px);
}

.zip-main-btn {
    display: inline-block;
    padding: 12px 20px;
    background: linear-gradient(135deg, var(--primary-color), #0056b3);
    color: var(--white);
    font-size: 14px;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    box-shadow: 0 2px 10px rgba(0, 123, 255, 0.3);
}

.zip-main-btn:hover {
    background: linear-gradient(135deg, #0056b3, var(--primary-color));
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 123, 255, 0.4);
}

/* Pagination */
.pagination-nav {
    text-align: center;
    padding: 20px 0;
    margin: 20px 0;
}

.pagination-btn {
    display: inline-block;
    padding: 10px 15px;
    margin: 0 3px;
    background: var(--white);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
    font-weight: 500;
    min-width: 45px;
    text-align: center;
}

.pagination-btn:hover {
    background: var(--primary-color);
    color: var(--white);
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.pagination-btn.active {
    background: var(--primary-color);
    color: var(--white);
    border-color: var(--primary-color);
    box-shadow: var(--shadow);
}

.pagination-btn.disabled {
    color: var(--secondary-color);
    background: var(--light-bg);
    border-color: var(--border-color);
    cursor: not-allowed;
}

.pagination-btn.disabled:hover {
    transform: none;
    box-shadow: none;
}

/* Sort Form */
form {
    background: var(--white);
    padding: 15px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    margin: 15px 0;
    text-align: center;
}

select {
    padding: 8px 15px;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    background: var(--white);
    font-size: 14px;
    cursor: pointer;
    transition: var(--transition);
    min-width: 150px;
}

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

/* No Files Message */
.no-files {
    text-align: center;
    padding: 40px 20px;
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    color: var(--secondary-color);
    font-size: 16px;
}

/* Footer */
.footer {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(135deg, #2c3e50, #34495e);
    color: var(--white);
    padding: 15px;
    text-align: center;
    border-top: 1px solid var(--border-color);
    box-shadow: 0 -2px 10px rgba(0,0,0,0.1);
    z-index: 99;
}

.footer a {
    color: #3498db;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}

.footer a:hover {
    color: var(--white);
    text-shadow: 0 0 8px #3498db;
}

/* Responsive Design */
@media (min-width: 768px) {
    .container {
        padding: 0 20px;
    }
    
    .bg {
        padding: 20px;
    }
    
    .current-path {
        font-size: 18px;
        padding: 20px;
    }
    
    .folder-info {
        padding: 25px;
    }
    
    .download-options {
        padding: 25px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 5px;
    }
    
    .bg {
        padding: 12px;
        margin-bottom: 5px;
    }
    
    .current-path {
        font-size: 14px;
        padding: 12px 10px;
    }
    
    .breadcrumb {
        padding: 10px;
        font-size: 12px;
    }
    
    .pagination-btn {
        padding: 8px 12px;
        margin: 0 2px;
        font-size: 13px;
    }
    
    .zip-main-btn {
        width: 100%;
        text-align: center;
    }
    
    .download-options a {
        padding: 15px;
        font-size: 14px;
    }
}

/* Performance Optimizations */
.bg,
.pagination-btn,
.sm2_button,
.zip-btn,
.download-options a {
    will-change: transform;
    backface-visibility: hidden;
}

/* Loading States */
.loading {
    opacity: 0.6;
    pointer-events: none;
    position: relative;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid var(--primary-color);
    border-radius: 50%;
    border-top-color: transparent;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

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

/* Focus styles for keyboard navigation */
a:focus,
select:focus,
.pagination-btn:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --shadow: 0 2px 4px rgba(0,0,0,0.3);
        --border-color: #000;
    }
}

/* Dark mode support (if needed) */
@media (prefers-color-scheme: dark) {
    :root {
        --dark: #ffffff;
        --white: #1a1a1a;
        --light-bg: #2d2d2d;
        --border-color: #404040;
    }
    
    body {
        background: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 100%);
    }
}