:root {
    --primary: #3b82f6;
    --primary-dark: #2563eb;
    --secondary: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --dark: #1e293b;
    --darker: #0f172a;
    --light: #f1f5f9;
    --gray: #64748b;
    --border: #334155;
    --card-bg: #1e293b;
    --body-bg: #0f172a;
    --text: #e2e8f0;
    --text-muted: #94a3b8;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--body-bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color 0.3s;
}

a:hover {
    color: var(--primary-dark);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

.header {
    background: linear-gradient(135deg, var(--darker) 0%, var(--dark) 100%);
    border-bottom: 1px solid var(--border);
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo {
    font-size: 24px;
    font-weight: bold;
    background: linear-gradient(135deg, var(--primary) 0%, #8b5cf6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
    list-style: none;
}

.nav-menu li a {
    color: var(--text-muted);
    text-decoration: none;
    padding: 6px 12px;
    border-radius: 6px;
    transition: all 0.3s;
    font-size: 13px;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--text);
    background: rgba(59, 130, 246, 0.2);
}

.mobile-menu-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary) 0%, #8b5cf6 100%);
    border: none;
    color: white;
    font-size: 20px;
    cursor: pointer;
    padding: 12px 16px;
    border-radius: 10px;
    transition: all 0.3s;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
}

.mobile-menu-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.5);
}

.mobile-menu-btn i {
    display: block;
    width: 20px;
    height: 2px;
    background: white;
    position: relative;
}

.mobile-menu-btn i::before,
.mobile-menu-btn i::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 2px;
    background: white;
    left: 0;
}

.mobile-menu-btn i::before {
    top: -6px;
}

.mobile-menu-btn i::after {
    top: 6px;
}

.sidebar {
    position: fixed;
    left: -280px;
    top: 0;
    width: 280px;
    height: 100vh;
    background: var(--dark);
    border-right: 1px solid var(--border);
    z-index: 200;
    transition: left 0.3s;
    overflow-y: auto;
}

.sidebar.open {
    left: 0;
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.sidebar-close {
    background: none;
    border: none;
    color: var(--text);
    font-size: 24px;
    cursor: pointer;
}

.sidebar-menu {
    list-style: none;
    padding: 15px 0;
}

.sidebar-menu li {
    padding: 0;
}

.sidebar-menu a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 20px;
    color: var(--text);
    text-decoration: none;
    transition: all 0.3s;
    border-radius: 8px;
    margin: 4px 8px;
    font-size: 15px;
    font-weight: 500;
}

.sidebar-menu a:hover {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.2) 0%, rgba(139, 92, 246, 0.2) 100%);
    color: var(--primary);
    transform: translateX(5px);
}

.sidebar-menu a.active {
    background: linear-gradient(135deg, var(--primary) 0%, #8b5cf6 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.4);
}

.sidebar-menu i {
    width: 20px;
    text-align: center;
}

.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 150;
    display: none;
}

.overlay.show {
    display: block;
}

.card {
    background: var(--card-bg);
    border-radius: 12px;
    border: 1px solid var(--border);
    overflow: hidden;
}

.card-header {
    padding: 15px 20px;
    border-bottom: 1px solid var(--border);
    font-weight: 600;
}

.card-body {
    padding: 20px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border: none;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, #8b5cf6 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
}

.btn-primary:hover {
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.5);
}

.btn-secondary {
    background: linear-gradient(135deg, var(--secondary) 0%, #64748b 100%);
    color: white;
}

.btn-success {
    background: linear-gradient(135deg, var(--secondary) 0%, #059669 100%);
    color: white;
}

.btn-danger {
    background: linear-gradient(135deg, var(--danger) 0%, #dc2626 100%);
    color: white;
}

.btn-warning {
    background: linear-gradient(135deg, var(--warning) 0%, #d97706 100%);
    color: white;
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--border);
    color: var(--text);
}

.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: rgba(59, 130, 246, 0.1);
}

.btn-sm {
    padding: 8px 16px;
    font-size: 13px;
}

.btn-lg {
    padding: 16px 32px;
    font-size: 16px;
}

.btn-block {
    width: 100%;
}

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

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

.form-control {
    width: 100%;
    padding: 12px 15px;
    background: var(--darker);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text);
    font-size: 14px;
    transition: border-color 0.3s;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
}

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

select.form-control {
    cursor: pointer;
}

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

.alert {
    padding: 15px 20px;
    border-radius: 8px;
    margin-bottom: 20px;
}

.alert-success {
    background: rgba(16, 185, 129, 0.2);
    border: 1px solid var(--secondary);
    color: var(--secondary);
}

.alert-danger {
    background: rgba(239, 68, 68, 0.2);
    border: 1px solid var(--danger);
    color: var(--danger);
}

.alert-warning {
    background: rgba(245, 158, 11, 0.2);
    border: 1px solid var(--warning);
    color: var(--warning);
}

.badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
}

.badge-primary {
    background: rgba(59, 130, 246, 0.2);
    color: var(--primary);
}

.badge-success {
    background: rgba(16, 185, 129, 0.2);
    color: var(--secondary);
}

.badge-danger {
    background: rgba(239, 68, 68, 0.2);
    color: var(--danger);
}

.badge-warning {
    background: rgba(245, 158, 11, 0.2);
    color: var(--warning);
}

.table {
    width: 100%;
    border-collapse: collapse;
}

.table th,
.table td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.table th {
    background: var(--darker);
    font-weight: 600;
    color: var(--text-muted);
}

.table tr:hover {
    background: rgba(59, 130, 246, 0.05);
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.product-card {
    background: var(--card-bg);
    border-radius: 12px;
    border: 1px solid var(--border);
    overflow: hidden;
    transition: transform 0.3s, box-shadow 0.3s;
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.product-image {
    width: 100%;
    height: 180px;
    object-fit: cover;
    background: var(--darker);
}

.product-info {
    padding: 15px;
}

.product-name {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text);
}

.product-desc {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 12px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.product-price {
    font-size: 20px;
    font-weight: bold;
    color: var(--primary);
    margin-bottom: 12px;
}

.product-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 12px;
    color: var(--text-muted);
}

.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    z-index: 300;
    display: none;
    align-items: center;
    justify-content: center;
}

.modal.show {
    display: flex;
}

.modal-content {
    background: var(--dark);
    border-radius: 12px;
    border: 1px solid var(--border);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-header {
    padding: 20px;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-title {
    font-size: 18px;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 24px;
    cursor: pointer;
}

.modal-body {
    padding: 20px;
}

.modal-footer {
    padding: 15px 20px;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

.tabs {
    display: flex;
    border-bottom: 1px solid var(--border);
    margin-bottom: 20px;
}

.tab {
    padding: 12px 24px;
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s;
    position: relative;
}

.tab.active {
    color: var(--primary);
}

.tab.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--primary);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 15px;
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary) 0%, #8b5cf6 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
}

.user-name {
    font-weight: 500;
}

.user-role {
    font-size: 12px;
    color: var(--text-muted);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: linear-gradient(135deg, var(--card-bg) 0%, var(--darker) 100%);
    border-radius: 12px;
    padding: 20px;
    border: 1px solid var(--border);
}

.stat-value {
    font-size: 28px;
    font-weight: bold;
    margin-bottom: 5px;
}

.stat-label {
    font-size: 14px;
    color: var(--text-muted);
}

.pagination {
    display: flex;
    justify-content: center;
    gap: 5px;
    margin-top: 20px;
}

.pagination a,
.pagination span {
    padding: 8px 12px;
    border-radius: 6px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    color: var(--text);
}

.pagination a:hover {
    background: var(--primary);
    border-color: var(--primary);
}

.pagination .active {
    background: var(--primary);
    border-color: var(--primary);
}

.hero {
    background: linear-gradient(135deg, var(--darker) 0%, var(--dark) 50%, var(--darker) 100%);
    padding: 60px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 50%, rgba(59, 130, 246, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 70% 50%, rgba(139, 92, 246, 0.1) 0%, transparent 50%);
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: 36px;
    margin-bottom: 15px;
    background: linear-gradient(135deg, var(--text) 0%, var(--primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: 18px;
    color: var(--text-muted);
    margin-bottom: 30px;
}

.search-box {
    max-width: 500px;
    margin: 0 auto;
    display: flex;
    gap: 10px;
}

.search-box input {
    flex: 1;
}

.announcement-bar {
    background: linear-gradient(90deg, var(--primary) 0%, #8b5cf6 100%);
    padding: 12px;
    text-align: center;
    color: white;
}

.announcement-bar a {
    color: white;
    text-decoration: underline;
}

.footer {
    background: var(--darker);
    border-top: 1px solid var(--border);
    padding: 30px 0;
    margin-top: 50px;
    text-align: center;
    color: var(--text-muted);
}

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

.empty-state i {
    font-size: 48px;
    margin-bottom: 15px;
    opacity: 0.5;
}

.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--border);
    border-radius: 50%;
    border-top-color: var(--primary);
    animation: spin 1s linear infinite;
}

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

.music-player {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: var(--card-bg);
    border-radius: 12px;
    padding: 15px;
    border: 1px solid var(--border);
    z-index: 100;
    display: flex;
    align-items: center;
    gap: 10px;
}

.music-player audio {
    height: 30px;
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .hero h1 {
        font-size: 28px;
    }
    
    .hero p {
        font-size: 16px;
    }
    
    .stats-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .product-grid {
        grid-template-columns: 1fr;
    }
    
    .table {
        display: block;
        overflow-x: auto;
    }
    
    .modal-content {
        width: 95%;
    }
    
    .sidebar {
        width: 100%;
        height: auto;
        position: relative;
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .card {
        padding: 15px;
    }
    
    .btn {
        padding: 10px 16px;
        font-size: 14px;
    }
    
    .form-control {
        font-size: 16px;
    }
    
    .music-player {
        bottom: 10px;
        right: 10px;
        left: 10px;
        min-width: auto;
    }
    
    .music-player .music-info {
        flex-direction: row;
    }
    
    .music-player .music-controls {
        gap: 10px;
    }
    
    .music-player .music-btn.play-btn {
        width: 40px;
        height: 40px;
    }
}

@media (max-width: 480px) {
    body {
        font-size: 14px;
    }
    
    .hero h1 {
        font-size: 24px;
    }
    
    .hero p {
        font-size: 14px;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .card-header {
        font-size: 16px;
    }
    
    .table th, .table td {
        padding: 10px 8px;
        font-size: 12px;
    }
    
    .btn-sm {
        padding: 6px 12px;
        font-size: 12px;
    }
    
    .music-player {
        padding: 10px;
    }
    
    .music-player .music-title {
        font-size: 12px;
        max-width: 120px;
    }
    
    .music-player .music-mode {
        font-size: 10px;
    }
}

.chat-container {
    background: var(--card-bg);
    border-radius: 12px;
    border: 1px solid var(--border);
    height: 500px;
    display: flex;
    flex-direction: column;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 15px;
}

.chat-message {
    margin-bottom: 15px;
}

.chat-message-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 5px;
}

.chat-message-user {
    font-weight: 500;
}

.chat-message-time {
    font-size: 11px;
    color: var(--text-muted);
}

.chat-message-content {
    background: var(--darker);
    padding: 10px 15px;
    border-radius: 8px;
    display: inline-block;
    max-width: 80%;
}

.chat-input {
    padding: 15px;
    border-top: 1px solid var(--border);
    display: flex;
    gap: 10px;
}

.chat-input input {
    flex: 1;
}

.rating {
    display: flex;
    gap: 5px;
}

.rating i {
    color: var(--warning);
    cursor: pointer;
}

.rating i.empty {
    color: var(--border);
}

/* 音乐播放器样式 */
.music-player {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: var(--dark);
    border-radius: 16px;
    padding: 15px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
    border: 1px solid var(--border);
    z-index: 1000;
    min-width: 280px;
    transition: all 0.3s ease;
}

.music-player.collapsed {
    min-width: auto;
    padding: 10px;
}

.music-player.collapsed .music-info,
.music-player.collapsed .music-progress,
.music-player.collapsed .music-controls {
    display: none;
}

.music-player-toggle {
    position: absolute;
    top: -10px;
    right: -10px;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background: var(--primary);
    border: none;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
}

.music-info {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.music-cover {
    width: 50px;
    height: 50px;
    border-radius: 8px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
}

.music-details {
    flex: 1;
}

.music-title {
    font-weight: 600;
    font-size: 14px;
    margin-bottom: 4px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 180px;
}

.music-mode {
    font-size: 12px;
    color: var(--text-muted);
}

.music-progress {
    margin-bottom: 12px;
}

.progress-bar {
    width: 100%;
    height: 4px;
    background: var(--border);
    border-radius: 2px;
    cursor: pointer;
    position: relative;
}

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

.progress-time {
    display: flex;
    justify-content: space-between;
    font-size: 11px;
    color: var(--text-muted);
    margin-top: 5px;
}

.music-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
}

.music-btn {
    background: none;
    border: none;
    color: var(--text);
    cursor: pointer;
    font-size: 18px;
    padding: 8px;
    border-radius: 50%;
    transition: all 0.2s;
}

.music-btn:hover {
    background: var(--darker);
    color: var(--primary);
}

.music-btn.play-btn {
    width: 45px;
    height: 45px;
    background: var(--primary);
    color: white;
    font-size: 20px;
}

.music-btn.play-btn:hover {
    background: var(--accent);
    color: white;
    transform: scale(1.05);
}

.music-volume {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 10px;
}

.volume-slider {
    flex: 1;
    height: 4px;
    background: var(--border);
    border-radius: 2px;
    -webkit-appearance: none;
    appearance: none;
    cursor: pointer;
}

.volume-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 12px;
    height: 12px;
    background: var(--primary);
    border-radius: 50%;
    cursor: pointer;
}

/* 音乐列表 */
.music-list {
    max-height: 300px;
    overflow-y: auto;
}

.music-list-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.2s;
}

.music-list-item:hover {
    background: var(--darker);
}

.music-list-item.active {
    background: rgba(0, 212, 255, 0.1);
    border-left: 3px solid var(--primary);
}

.music-list-item .name {
    flex: 1;
    font-size: 14px;
}

.music-list-item .duration {
    font-size: 12px;
    color: var(--text-muted);
}