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

:root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #2a2a2a;
    --text-primary: #ffffff;
    --text-secondary: #b3b3b3;
    --text-muted: #666666;
    --accent-primary: #1db954;
    --accent-secondary: #1ed760;
    --accent-danger: #e22134;
    --border-color: #333333;
    --border-light: #404040;
    --shadow: rgba(0, 0, 0, 0.3);
    --transition: all 0.2s ease;
    --border-radius: 8px;
    --max-width: 1200px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Layout */
#app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1rem;
}

/* Navigation */
.navbar {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo {
    width: 32px;
    height: 32px;
    border-radius: 4px;
}

.logo-text {
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--accent-primary);
}

.user-menu {
    position: relative;
}

.login-btn {
    background-color: var(--accent-primary);
    color: var(--text-primary);
    border: none;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.login-btn:hover {
    background-color: var(--accent-secondary);
}

.user-dropdown {
    position: relative;
}

.user-avatar {
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    transition: var(--transition);
}

.user-avatar:hover {
    background-color: var(--bg-tertiary);
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    min-width: 150px;
    box-shadow: 0 4px 12px var(--shadow);
    z-index: 1000;
}

.dropdown-menu a {
    display: block;
    padding: 0.75rem 1rem;
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition);
}

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

/* Main Content */
main {
    flex: 1;
    padding: 2rem 0;
}

.page-header {
    text-align: center;
    margin-bottom: 3rem;
}

.page-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.page-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* Sections */
.section {
    margin-bottom: 4rem;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.section-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.section-subtitle {
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

/* Search */
.search-container {
    max-width: 600px;
    margin: 0 auto 3rem;
    position: relative;
}

.search-input {
    width: 100%;
    padding: 1rem 1rem 1rem 3rem;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    font-size: 1rem;
    transition: var(--transition);
}

.search-input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px rgba(29, 185, 84, 0.2);
}

.search-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    pointer-events: none;
}

/* Charts Grid */
.charts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.chart-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    transition: var(--transition);
}

.chart-card:hover {
    border-color: var(--border-light);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px var(--shadow);
}

.chart-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.chart-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--accent-primary);
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
}

.chart-title:hover {
    color: var(--accent-secondary);
}

.view-all-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    transition: var(--transition);
}

.view-all-link:hover {
    color: var(--accent-primary);
}

/* Song Lists */
.song-list {
    list-style: none;
}

.song-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
}

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

.song-item:hover {
    background-color: rgba(255, 255, 255, 0.02);
    border-radius: 4px;
    margin: 0 -0.5rem;
    padding-left: 0.5rem;
    padding-right: 0.5rem;
}

.song-position {
    font-weight: 700;
    color: var(--text-secondary);
    min-width: 2rem;
    text-align: center;
}

.song-info {
    flex: 1;
    min-width: 0;
}

.song-title {
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    cursor: pointer;
    transition: var(--transition);
}

.song-title:hover {
    color: var(--accent-primary);
}

.song-artist {
    color: var(--text-secondary);
    font-size: 0.875rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.song-stats {
    display: flex;
    align-items: center;
    gap: 1rem;
    color: var(--text-muted);
    font-size: 0.875rem;
}

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

.action-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.25rem;
    border-radius: 4px;
    transition: var(--transition);
}

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

.action-btn.liked {
    color: var(--accent-danger);
}

/* Chart Page Layout */
.chart-page-layout {
    display: grid;
    grid-template-columns: 280px 1fr 280px;
    gap: 1.5rem;
    align-items: start;
    margin-top: 2rem;
}

.chart-sidebar {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    max-height: 80vh;
    overflow-y: auto;
}

.chart-sidebar-left {
    order: 1;
}

.chart-sidebar-right {
    order: 3;
}

.chart-main {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    order: 2;
    min-height: 600px;
}

.chart-rankings {
    margin-top: 1rem;
}

.chart-controls {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1rem;
}

.tier-btn {
    padding: 0.5rem 1rem;
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
}

.tier-btn.active {
    background-color: var(--accent-primary);
    color: var(--text-primary);
    border-color: var(--accent-primary);
}

.tier-btn:hover:not(.active) {
    border-color: var(--border-light);
    color: var(--text-primary);
}

/* Categories */
.category-section {
    margin-bottom: 3rem;
}

.category-title {
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: 2rem;
    color: var(--text-primary);
}

.category-charts {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
    font-size: 0.875rem;
}

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

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

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

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

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

.btn-danger:hover {
    background-color: #cc1e2d;
}

/* Modals */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    backdrop-filter: blur(5px);
}

.modal-content {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    max-width: 500px;
    width: 90%;
    max-height: 90%;
    overflow-y: auto;
    box-shadow: 0 20px 60px var(--shadow);
}

.modal-header {
    padding: 1.5rem 1.5rem 1rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 1.5rem;
    padding: 0;
    line-height: 1;
}

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

.modal-body {
    padding: 1.5rem;
}

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 0.75rem;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    font-size: 0.875rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px rgba(29, 185, 84, 0.2);
}

.help-text {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

.error-message {
    color: var(--accent-danger);
    font-size: 0.75rem;
    margin-top: 0.25rem;
}

/* Checkboxes */
.checkboxes {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    font-weight: 400;
}

.checkbox-label input[type="checkbox"] {
    display: none;
}

.checkmark {
    width: 18px;
    height: 18px;
    border: 2px solid var(--border-color);
    border-radius: 3px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.checkbox-label input[type="checkbox"]:checked + .checkmark {
    background-color: var(--accent-primary);
    border-color: var(--accent-primary);
}

.checkbox-label input[type="checkbox"]:checked + .checkmark::after {
    content: "✓";
    color: white;
    font-size: 12px;
    font-weight: bold;
}

/* Login Options */
.login-options {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.login-option {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.login-option:hover {
    border-color: var(--border-light);
    background-color: var(--bg-tertiary);
}

.login-option.google:hover {
    border-color: #4285F4;
}

.login-option.apple:hover {
    border-color: #000;
}

/* Ad Modal */
.ad-content {
    max-width: 600px;
}

.ad-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.ad-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.ad-countdown {
    font-size: 0.875rem;
    color: var(--accent-primary);
}

.ad-body {
    padding: 2rem;
    text-align: center;
}

.ad-placeholder {
    background-color: var(--bg-primary);
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius);
    padding: 3rem 2rem;
    color: var(--text-muted);
}

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

.footer-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1rem;
}

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

.footer-copyright {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.footer-links {
    display: flex;
    gap: 2rem;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--accent-primary);
}

/* Loading */
.loading {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 2000;
}

.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;
}

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

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

.text-center {
    text-align: center;
}

.text-muted {
    color: var(--text-muted);
}

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }

/* Responsive Design */
@media (max-width: 1024px) {
    .chart-page-layout {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .chart-sidebar {
        order: 2;
    }
    
    .chart-main {
        order: 1;
    }
}

@media (max-width: 768px) {
    .nav-container {
        padding: 0 0.5rem;
    }
    
    .logo-text {
        display: none;
    }
    
    .page-title {
        font-size: 2rem;
    }
    
    .charts-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .category-charts {
        grid-template-columns: 1fr;
    }
    
    .chart-controls {
        flex-wrap: wrap;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .footer-links {
        gap: 1rem;
    }
    
    .modal-content {
        width: 95%;
        margin: 1rem;
    }
    
    .song-stats {
        display: none;
    }
    
    .song-item {
        gap: 0.5rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 0.5rem;
    }
    
    main {
        padding: 1rem 0;
    }
    
    .section {
        margin-bottom: 2rem;
    }
    
    .search-container {
        margin-bottom: 2rem;
    }
    
    .song-position {
        display: none;
    }
}