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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    background-color: #f5f5f5;
    color: #333;
    line-height: 1.6;
}

.app {
    min-height: 100vh;
    background-color: #fff;
    display: flex;
    flex-direction: column;
}

.header {
    background-color: #fff;
    padding: 15px 20px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
}

.header-title {
    font-size: 24px;
    font-weight: 600;
    color: #FF6B35;
}

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

.user-points {
    display: flex;
    align-items: center;
    gap: 5px;
    color: #FF6B35;
    font-weight: 500;
}

.icon-coin::before {
    content: '💰';
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    overflow: hidden;
    display: block;
}

.user-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.btn-login {
    padding: 8px 20px;
    background-color: #FF6B35;
    color: #fff;
    border-radius: 20px;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
}

.btn-login:hover {
    background-color: #e55a2b;
}

/* 顶部导航栏 */
.nav-bar {
    background-color: #FF6B35;
    padding: 0 20px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 70px;
    z-index: 90;
}

.nav-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: flex-start;
    align-items: center;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    color: #fff;
    font-size: 16px;
    font-weight: 500;
    padding: 15px 20px;
    transition: all 0.3s;
}

.nav-item:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.nav-item.active {
    background-color: rgba(255, 255, 255, 0.2);
    border-bottom: 3px solid #fff;
}

.nav-item i {
    font-size: 20px;
}

.icon-ksh::before {
    content: '📦';
}

.icon-dy::before {
    content: '🎵';
}

.icon-ai-video::before {
    content: '🎬';
}

.icon-ai-tool::before {
    content: '✨';
}

.icon-profile::before {
    content: '👤';
}

.main-content {
    flex: 1;
    padding: 20px;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.flash-message {
    padding: 12px 20px;
    margin: 15px 0;
    border-radius: 8px;
    font-size: 14px;
}

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

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

.flash-info {
    background-color: #d1ecf1;
    color: #0c5460;
    border: 1px solid #bee5eb;
}

.flash-warning {
    background-color: #fff3cd;
    color: #856404;
    border: 1px solid #ffeaa7;
}

.btn {
    display: inline-block;
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    text-align: center;
    transition: all 0.3s;
}

.btn-primary {
    background-color: #FF6B35;
    color: #fff;
}

.btn-primary:hover {
    background-color: #e55a2b;
}

.btn-secondary {
    background-color: #6c757d;
    color: #fff;
}

.btn-secondary:hover {
    background-color: #5a6268;
}

.btn-success {
    background-color: #28a745;
    color: #fff;
}

.btn-success:hover {
    background-color: #218838;
}

.btn-danger {
    background-color: #dc3545;
    color: #fff;
}

.btn-danger:hover {
    background-color: #c82333;
}

.btn-outline {
    background-color: transparent;
    border: 1px solid #FF6B35;
    color: #FF6B35;
}

.btn-outline:hover {
    background-color: #FF6B35;
    color: #fff;
}

.btn-block {
    display: block;
    width: 100%;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 12px;
}

.btn-lg {
    padding: 14px 28px;
    font-size: 16px;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.card {
    background-color: #fff;
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.card-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 15px;
    color: #333;
}

.card-body {
    font-size: 14px;
    color: #666;
}

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

.form-label {
    display: block;
    margin-bottom: 8px;
    font-size: 14px;
    font-weight: 500;
    color: #333;
}

.form-control {
    width: 100%;
    padding: 10px 15px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 14px;
    transition: border-color 0.3s;
}

.form-control:focus {
    outline: none;
    border-color: #FF6B35;
}

.form-control:disabled {
    background-color: #f5f5f5;
    cursor: not-allowed;
}

.form-text {
    font-size: 12px;
    color: #999;
    margin-top: 5px;
}

.loading {
    text-align: center;
    padding: 40px;
    color: #999;
}

.loading::after {
    content: '加载中...';
}

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

.empty::before {
    content: '📭';
    display: block;
    font-size: 48px;
    margin-bottom: 15px;
}

.badge {
    display: inline-block;
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
}

.badge-primary {
    background-color: #FF6B35;
    color: #fff;
}

.badge-success {
    background-color: #28a745;
    color: #fff;
}

.badge-warning {
    background-color: #ffc107;
    color: #333;
}

.badge-danger {
    background-color: #dc3545;
    color: #fff;
}

.badge-info {
    background-color: #17a2b8;
    color: #fff;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .header {
        padding: 12px 15px;
    }
    
    .header-title {
        font-size: 20px;
    }
    
    .header-content {
        padding: 0 10px;
    }
    
    .nav-bar {
        padding: 0 10px;
        top: 60px;
    }
    
    .nav-item {
        padding: 12px 10px;
        font-size: 14px;
    }
    
    .nav-item i {
        font-size: 16px;
    }
    
    .main-content {
        padding: 15px;
    }
    
    .card {
        padding: 15px;
        margin-bottom: 15px;
    }
}

/* 桌面端增强样式 */
@media (min-width: 1024px) {
    .main-content {
        padding: 30px 20px;
    }
    
    .card {
        padding: 25px;
        margin-bottom: 25px;
    }
    
    .card-title {
        font-size: 20px;
    }
    
    .nav-item {
        padding: 15px 25px;
    }
}