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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    background: white;
    min-height: 100vh;
    padding: 20px;
    color: #333;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: white;
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    overflow: hidden;
}

.header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 30px;
    text-align: center;
}

.header-avatar {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid rgba(255, 255, 255, 0.3);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
    margin-bottom: 20px;
    display: block;
    margin-left: auto;
    margin-right: auto;
}

.header h1 {
    font-size: 2.5em;
    font-weight: 300;
    margin-bottom: 10px;
}

.header p {
    opacity: 0.9;
    font-size: 1.1em;
}

.content {
    padding: 40px;
}

.section {
    margin-bottom: 40px;
}

.section-title {
    font-size: 1.8em;
    font-weight: 400;
    margin-bottom: 20px;
    color: #333;
    border-bottom: 2px solid #667eea;
    padding-bottom: 10px;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #555;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 1em;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #667eea;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 1em;
    cursor: pointer;
    transition: all 0.3s;
    font-weight: 500;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: #4CAF50;
    color: white;
}

.btn-secondary:hover {
    background: #45a049;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(76, 175, 80, 0.4);
}

.btn-danger {
    background: #f44336;
    color: white;
}

.btn-danger:hover {
    background: #da190b;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(244, 67, 54, 0.4);
}

.btn-small {
    padding: 8px 16px;
    font-size: 0.9em;
}

.song-list {
    display: grid;
    gap: 15px;
}

/* 可滚动容器 */
.scrollable-container {
    max-height: 400px;
    overflow-y: auto;
    border: 2px solid #e0e0e0;
    border-radius: 12px;
    padding: 15px;
    background: #f8f9fa;
}

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

.scrollable-container::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 4px;
}

.scrollable-container::-webkit-scrollbar-thumb {
    background: #667eea;
    border-radius: 4px;
}

.scrollable-container::-webkit-scrollbar-thumb:hover {
    background: #5568d3;
}

/* 搜索框 */
.search-box {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    align-items: center;
}

.search-input {
    flex: 1;
    padding: 12px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 1em;
    transition: border-color 0.3s;
}

.search-input:focus {
    outline: none;
    border-color: #667eea;
}

.song-item {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 12px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.3s;
    border: 2px solid transparent;
}

.song-item:hover {
    background: #e9ecef;
    border-color: #667eea;
    transform: translateX(5px);
}

.song-info {
    flex: 1;
}

.song-title {
    font-size: 1.2em;
    font-weight: 500;
    color: #333;
    margin-bottom: 5px;
}

.song-artist {
    color: #666;
    font-size: 0.95em;
}

.song-duration {
    color: #999;
    font-size: 0.85em;
    margin-top: 5px;
}

.song-actions {
    display: flex;
    gap: 10px;
}

.request-list {
    display: grid;
    gap: 15px;
}

.request-item {
    background: #fff3cd;
    padding: 20px;
    border-radius: 12px;
    border-left: 4px solid #ffc107;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.3s;
}

.request-item:hover {
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transform: translateY(-2px);
}

.request-info {
    flex: 1;
}

.request-title {
    font-size: 1.1em;
    font-weight: 500;
    color: #333;
    margin-bottom: 5px;
}

.request-meta {
    color: #666;
    font-size: 0.9em;
}

.request-time {
    color: #999;
    font-size: 0.85em;
    margin-top: 5px;
}

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: #999;
}

.empty-state-icon {
    font-size: 4em;
    margin-bottom: 20px;
    opacity: 0.5;
}

.message {
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 20px;
    display: none;
}

.message.success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.message.error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.message.show {
    display: block;
}

/* 悬浮 Toast 通知 */
.toast {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 16px 24px;
    border-radius: 12px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
    font-size: 1em;
    font-weight: 500;
    z-index: 10000;
    opacity: 0;
    transform: translateX(400px);
    transition: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    max-width: 400px;
    word-wrap: break-word;
}

.toast.show {
    opacity: 1;
    transform: translateX(0);
}

.toast-success {
    background: linear-gradient(135deg, #4CAF50 0%, #45a049 100%);
    color: white;
}

.toast-error {
    background: linear-gradient(135deg, #f44336 0%, #da190b 100%);
    color: white;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

/* 登录模态框 */
.login-modal {
    display: none;
    position: fixed;
    z-index: 10000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    justify-content: center;
    align-items: center;
}

.login-modal-content {
    background-color: white;
    padding: 40px;
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    max-width: 400px;
    width: 90%;
}

.login-modal-content h2 {
    margin-bottom: 20px;
    text-align: center;
    color: #333;
}

@media (max-width: 768px) {
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .song-item,
    .request-item {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .song-actions {
        width: 100%;
        margin-top: 15px;
    }
    
    .btn {
        width: 100%;
    }
    
    .toast {
        right: 10px;
        left: 10px;
        max-width: calc(100% - 20px);
        transform: translateY(-100px);
    }
    
    .toast.show {
        transform: translateY(0);
    }
}