/* ============================================
   XOMusic - 主样式表
   深色主题 + 毛玻璃效果 + 现代化UI
   ============================================ */

/* --- CSS Variables --- */
:root {
    --primary: #1DB954;
    --primary-hover: #1ed760;
    --primary-dim: rgba(29, 185, 84, 0.15);
    --bg: #0f0f0f;
    --bg-card: #1a1a1a;
    --bg-surface: #252525;
    --bg-hover: #2a2a2a;
    --bg-input: #1e1e1e;
    --border: #333;
    --text: #fff;
    --text-secondary: #aaa;
    --text-muted: #666;
    --danger: #e74c3c;
    --warning: #f39c12;
    --info: #3498db;
    --radius: 12px;
    --radius-sm: 8px;
    --radius-lg: 16px;
    --shadow: 0 4px 20px rgba(0,0,0,0.3);
    --transition: 0.2s ease;
    --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    --max-width: 1200px;
    --nav-height: 64px;
    --player-height: 80px;
}

/* --- Reset & Base --- */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html { font-size: 16px; scroll-behavior: smooth; }

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    padding-bottom: var(--player-height);
}

a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary-hover); }

img { max-width: 100%; height: auto; }

ul, ol { list-style: none; }

input, textarea, select, button {
    font-family: inherit;
    font-size: inherit;
}

/* --- Scrollbar --- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: #444; border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: #555; }

/* --- Container --- */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* ============================================
   Navigation
   ============================================ */
.nav {
    position: sticky;
    top: 0;
    z-index: 1000;
    height: var(--nav-height);
    background: rgba(15, 15, 15, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255,255,255,0.06);
    display: flex;
    align-items: center;
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 700;
    color: var(--text);
}

.nav-brand .logo-icon {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--primary), #1ed760);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-links a {
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 14px;
    transition: all var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--text);
    background: var(--bg-surface);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.nav-actions .btn {
    padding: 8px 20px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    transition: all var(--transition);
}

.nav-actions .btn-outline {
    border: 1px solid var(--border);
    color: var(--text);
    background: transparent;
}
.nav-actions .btn-outline:hover { border-color: var(--primary); color: var(--primary); }

.nav-actions .btn-primary {
    background: var(--primary);
    color: #000;
    border: none;
}
.nav-actions .btn-primary:hover { background: var(--primary-hover); }

/* --- User Dropdown --- */
.nav-user-dropdown {
    position: relative;
}

.nav-user {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    transition: background var(--transition);
    user-select: none;
}
.nav-user:hover { background: var(--bg-surface); }
.nav-user img { width: 32px; height: 32px; border-radius: 50%; object-fit: cover; }
.nav-user .name { font-size: 14px; color: var(--text); }
.nav-user .arrow {
    font-size: 10px;
    color: var(--text-muted);
    transition: transform var(--transition);
}
.nav-user-dropdown:hover .arrow { transform: rotate(180deg); }

.dropdown-menu {
    position: absolute;
    top: calc(100% + 6px);
    right: 0;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 8px;
    min-width: 180px;
    box-shadow: 0 8px 30px rgba(0,0,0,0.5);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-6px);
    transition: all 0.2s ease;
    z-index: 1100;
}

.nav-user-dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 14px;
    transition: all var(--transition);
    text-decoration: none;
}

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

.dropdown-menu a.danger {
    color: var(--danger);
}
.dropdown-menu a.danger:hover {
    background: rgba(231, 76, 60, 0.1);
}

.dropdown-divider {
    height: 1px;
    background: var(--border);
    margin: 4px 0;
}

/* --- Announcement Bar --- */
.announcement-bar {
    background: rgba(29, 185, 84, 0.1);
    border-bottom: 1px solid rgba(29, 185, 84, 0.2);
    overflow: hidden;
    height: 36px;
    display: flex;
    align-items: center;
}

.announcement-bar.urgent {
    background: rgba(231, 76, 60, 0.1);
    border-color: rgba(231, 76, 60, 0.3);
}

.announcement-bar.update {
    background: rgba(52, 152, 219, 0.1);
    border-color: rgba(52, 152, 219, 0.2);
}

.announcement-bar .marquee {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 0 20px;
    white-space: nowrap;
    animation: marquee 20s linear infinite;
}

.announcement-bar .tag {
    font-size: 11px;
    padding: 2px 8px;
    border-radius: 4px;
    font-weight: 600;
    text-transform: uppercase;
}

.announcement-bar .tag.normal { background: rgba(29, 185, 84, 0.3); color: var(--primary); }
.announcement-bar .tag.urgent { background: rgba(231, 76, 60, 0.3); color: var(--danger); }
.announcement-bar .tag.update { background: rgba(52, 152, 219, 0.3); color: var(--info); }

.announcement-bar .text { font-size: 13px; color: var(--text-secondary); }

.announcement-bar .close-btn {
    margin-left: auto;
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 16px;
    padding: 4px 8px;
}

@keyframes marquee {
    0% { transform: translateX(0); }
    100% { transform: translateX(-100%); }
}

/* ============================================
   Main Content
   ============================================ */
.main-content {
    min-height: calc(100vh - var(--nav-height) - var(--player-height));
    padding: 30px 0;
}

/* ============================================
   Cards
   ============================================ */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: all var(--transition);
}

.card:hover {
    border-color: rgba(255,255,255,0.1);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.card-cover {
    position: relative;
    aspect-ratio: 1;
    overflow: hidden;
}

.card-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.card:hover .card-cover img { transform: scale(1.05); }

.card-cover .play-btn {
    position: absolute;
    bottom: 10px;
    right: 10px;
    width: 40px;
    height: 40px;
    background: var(--primary);
    border: none;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    cursor: pointer;
    opacity: 0;
    transform: translateY(10px);
    transition: all var(--transition);
    box-shadow: 0 4px 12px rgba(0,0,0,0.4);
}

.card:hover .card-cover .play-btn { opacity: 1; transform: translateY(0); }
.card-cover .play-btn:hover { background: var(--primary-hover); transform: translateY(0) scale(1.1); }

.card-body { padding: 14px; }

.card-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 4px;
}

.card-subtitle {
    font-size: 12px;
    color: var(--text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.card-tag {
    display: inline-block;
    font-size: 11px;
    padding: 2px 8px;
    background: var(--primary-dim);
    color: var(--primary);
    border-radius: 4px;
    margin-top: 8px;
}

/* --- Song Grid --- */
.song-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 20px;
}

@media (max-width: 768px) {
    .song-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
}

/* --- Platform Grid --- */
.platform-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 16px;
}

.platform-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px 16px;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition);
}

.platform-card:hover {
    border-color: var(--primary);
    background: var(--bg-surface);
}

.platform-card .platform-icon {
    font-size: 36px;
    margin-bottom: 12px;
}

.platform-card .platform-name {
    font-size: 14px;
    font-weight: 600;
    color: var(--text);
}

.platform-card .platform-count {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 4px;
}

/* ============================================
   Section Header
   ============================================ */
.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
}

.section-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--text);
}

.section-more {
    font-size: 13px;
    color: var(--text-muted);
    transition: color var(--transition);
}
.section-more:hover { color: var(--primary); }

/* ============================================
   Search
   ============================================ */
.search-bar {
    display: flex;
    gap: 10px;
    max-width: 600px;
    margin: 0 auto 30px;
}

.search-bar input {
    flex: 1;
    padding: 14px 20px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 50px;
    color: var(--text);
    font-size: 15px;
    outline: none;
    transition: border-color var(--transition);
}

.search-bar input:focus { border-color: var(--primary); }

.search-bar input::placeholder { color: var(--text-muted); }

.search-bar button {
    padding: 14px 28px;
    background: var(--primary);
    border: none;
    border-radius: 50px;
    color: #000;
    font-weight: 600;
    font-size: 15px;
    cursor: pointer;
    transition: background var(--transition);
}
.search-bar button:hover { background: var(--primary-hover); }

/* ============================================
   Player
   ============================================ */
.player-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 1001;
    height: var(--player-height);
    background: rgba(15, 15, 15, 0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-top: 1px solid rgba(255,255,255,0.06);
    display: flex;
    align-items: center;
    padding: 0 20px;
}

.player-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    gap: 20px;
}

.player-info {
    display: flex;
    align-items: center;
    gap: 12px;
    min-width: 200px;
    max-width: 280px;
}

.player-info .cover {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
    object-fit: cover;
    background: var(--bg-surface);
}

.player-info .meta { min-width: 0; }
.player-info .title { font-size: 14px; font-weight: 600; color: var(--text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.player-info .artist { font-size: 12px; color: var(--text-muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.player-controls {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
}

.player-buttons {
    display: flex;
    align-items: center;
    gap: 20px;
}

.player-buttons button {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 18px;
    cursor: pointer;
    transition: all var(--transition);
    padding: 4px;
}

.player-buttons button:hover { color: var(--text); }
.player-buttons .btn-play {
    width: 38px;
    height: 38px;
    background: var(--text);
    border-radius: 50%;
    color: #000;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
}
.player-buttons .btn-play:hover { background: var(--primary); }

.player-progress {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    max-width: 500px;
}

.progress-bar {
    flex: 1;
    height: 4px;
    background: #333;
    border-radius: 2px;
    cursor: pointer;
    position: relative;
}

.progress-bar .fill {
    height: 100%;
    background: var(--primary);
    border-radius: 2px;
    width: 0%;
    transition: width 0.1s linear;
}

.progress-bar .thumb {
    position: absolute;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 12px;
    height: 12px;
    background: var(--primary);
    border-radius: 50%;
    opacity: 0;
    transition: opacity var(--transition);
}

.progress-bar:hover .thumb { opacity: 1; }

.player-time { font-size: 11px; color: var(--text-muted); min-width: 40px; }

.player-extra {
    display: flex;
    align-items: center;
    gap: 16px;
}

.player-extra button {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 18px;
    cursor: pointer;
    transition: color var(--transition);
}
.player-extra button:hover { color: var(--text); }

.volume-slider {
    width: 80px;
    height: 4px;
    background: #333;
    border-radius: 2px;
    cursor: pointer;
}

.volume-slider .fill {
    height: 100%;
    background: var(--text-secondary);
    border-radius: 2px;
    width: 70%;
}

/* ============================================
   Auth Pages
   ============================================ */
.auth-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: calc(100vh - var(--nav-height) - var(--player-height));
    padding: 40px 20px;
}

.auth-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 40px;
    width: 100%;
    max-width: 420px;
}

.auth-card h2 {
    text-align: center;
    margin-bottom: 8px;
    font-size: 24px;
}

.auth-card .subtitle {
    text-align: center;
    color: var(--text-muted);
    margin-bottom: 30px;
    font-size: 14px;
}

.form-group { margin-bottom: 20px; }

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
}

.form-control {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-size: 15px;
    transition: border-color var(--transition);
    outline: none;
}
.form-control:focus { border-color: var(--primary); }
.form-control::placeholder { color: var(--text-muted); }

textarea.form-control { resize: vertical; min-height: 100px; }

.form-hint { font-size: 12px; color: var(--text-muted); margin-top: 6px; }

.form-check { display: flex; align-items: center; gap: 8px; margin-bottom: 20px; }
.form-check input[type="checkbox"] { accent-color: var(--primary); }
.form-check label { font-size: 14px; color: var(--text-secondary); }

.btn {
    display: inline-block;
    padding: 12px 28px;
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    border: none;
    text-align: center;
}

.btn-block { display: block; width: 100%; }
.btn-primary { background: var(--primary); color: #000; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-outline { border: 1px solid var(--border); color: var(--text); background: transparent; }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: #c0392b; }
.btn-sm { padding: 6px 14px; font-size: 13px; }
.btn-xs { padding: 3px 10px; font-size: 12px; }

.form-footer {
    text-align: center;
    margin-top: 20px;
    font-size: 14px;
    color: var(--text-muted);
}

.form-footer a { color: var(--primary); font-weight: 500; }

/* ============================================
   Alerts
   ============================================ */
.alert {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    margin-bottom: 20px;
    font-size: 14px;
}

.alert-error {
    background: rgba(231, 76, 60, 0.1);
    border: 1px solid rgba(231, 76, 60, 0.3);
    color: var(--danger);
}

.alert-success {
    background: rgba(29, 185, 84, 0.1);
    border: 1px solid rgba(29, 185, 84, 0.3);
    color: var(--primary);
}

.alert-info {
    background: rgba(52, 152, 219, 0.1);
    border: 1px solid rgba(52, 152, 219, 0.3);
    color: var(--info);
}

/* ============================================
   Modal (Player Detail)
   ============================================ */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.7);
    backdrop-filter: blur(8px);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 40px;
    width: 90%;
    max-width: 500px;
    text-align: center;
}

.modal-content .cover-img {
    width: 200px;
    height: 200px;
    border-radius: var(--radius);
    object-fit: cover;
    margin-bottom: 20px;
    box-shadow: var(--shadow);
}

.modal-content .song-title { font-size: 20px; font-weight: 700; margin-bottom: 6px; }
.modal-content .song-artist { color: var(--text-muted); font-size: 15px; }

/* ============================================
   Admin Panel
   ============================================ */
.admin-layout {
    display: flex;
    min-height: calc(100vh - var(--nav-height) - var(--player-height));
}

.admin-sidebar {
    width: 240px;
    background: var(--bg-card);
    border-right: 1px solid var(--border);
    padding: 20px 0;
    flex-shrink: 0;
}

.admin-sidebar .menu-title {
    padding: 8px 20px 16px;
    font-size: 12px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.admin-sidebar a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 20px;
    color: var(--text-secondary);
    font-size: 14px;
    transition: all var(--transition);
    border-left: 3px solid transparent;
}

.admin-sidebar a:hover,
.admin-sidebar a.active {
    color: var(--text);
    background: var(--bg-surface);
    border-left-color: var(--primary);
}

.admin-content {
    flex: 1;
    padding: 30px;
    overflow-x: auto;
}

/* --- Stats Cards --- */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
}

.stat-card .stat-icon {
    font-size: 28px;
    margin-bottom: 12px;
}

.stat-card .stat-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--text);
}

.stat-card .stat-label {
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 4px;
}

/* --- Data Table --- */
.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th {
    text-align: left;
    padding: 12px 16px;
    font-size: 12px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 1px solid var(--border);
}

.data-table td {
    padding: 12px 16px;
    font-size: 14px;
    border-bottom: 1px solid rgba(255,255,255,0.05);
    color: var(--text-secondary);
}

.data-table tr:hover td {
    background: rgba(255,255,255,0.02);
}

.data-table .actions { display: flex; gap: 8px; }

/* --- Admin Card --- */
.admin-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    margin-bottom: 20px;
}

.admin-card .card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
}

.admin-card .card-header h3 {
    font-size: 18px;
    font-weight: 600;
}

/* --- Pagination --- */
.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    margin-top: 30px;
}

.pagination a, .pagination span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    transition: all var(--transition);
}

.pagination a {
    background: var(--bg-surface);
    color: var(--text-secondary);
}

.pagination a:hover { background: var(--primary); color: #000; }
.pagination span.active { background: var(--primary); color: #000; font-weight: 600; }
.pagination span.disabled { color: var(--text-muted); }

/* --- Empty State --- */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}

.empty-state .empty-icon { font-size: 48px; margin-bottom: 16px; }
.empty-state .empty-text { font-size: 16px; }

/* --- Loading --- */
.loading {
    text-align: center;
    padding: 40px;
    color: var(--text-muted);
}

.spinner {
    width: 36px;
    height: 36px;
    border: 3px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto 12px;
}

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

/* --- Utility --- */
.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }
.hidden { display: none !important; }

/* --- Responsive --- */
@media (max-width: 768px) {
    .admin-layout { flex-direction: column; }
    .admin-sidebar { width: 100%; padding: 0; }
    .admin-sidebar a { padding: 10px 16px; font-size: 13px; }
    .admin-content { padding: 20px 16px; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .player-extra { display: none; }
    .player-info { min-width: 120px; max-width: 180px; }
    .nav-links { display: none; }
}