/* 前台头部样式 - 简洁现代设计 */

.frontend-header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 1px 20px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 24px;
    height: 64px;
}

.site-logo {
    font-size: 26px;
    font-weight: 700;
    text-decoration: none;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    transition: all 0.3s ease;
    letter-spacing: -0.5px;
}

.site-logo:hover {
    transform: scale(1.02);
}

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

.nav-item {
    color: #64748b;
    text-decoration: none;
    padding: 10px 20px;
    border-radius: 12px;
    transition: all 0.3s ease;
    font-weight: 500;
    font-size: 15px;
    position: relative;
    letter-spacing: 0.3px;
}

.nav-item:hover {
    color: #667eea;
    background: rgba(102, 126, 234, 0.08);
    transform: translateY(-1px);
}

.nav-item.active {
    color: #667eea;
    background: rgba(102, 126, 234, 0.12);
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.15);
}

/* 特殊按钮样式 - 管理按钮 */
.nav-item.btn-admin {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    font-weight: 600;
    margin-left: 8px;
    box-shadow: 0 2px 12px rgba(102, 126, 234, 0.3);
}

.nav-item.btn-admin:hover {
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(102, 126, 234, 0.4);
    background: linear-gradient(135deg, #5a67d8 0%, #6b46c1 100%);
}

/* 滚动时的效果 */
.frontend-header.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 2px 24px rgba(0, 0, 0, 0.12);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .header-container {
        padding: 0 20px;
        height: 56px;
    }
    
    .site-logo {
        font-size: 22px;
    }
    
    .main-nav {
        gap: 4px;
    }
    
    .nav-item {
        padding: 8px 16px;
        font-size: 14px;
    }
    
    .nav-item.btn-admin {
        margin-left: 4px;
    }
}

@media (max-width: 480px) {
    .header-container {
        padding: 0 16px;
        height: 52px;
    }
    
    .site-logo {
        font-size: 20px;
    }
    
    .main-nav {
        gap: 2px;
    }
    
    .nav-item {
        padding: 6px 12px;
        font-size: 13px;
    }
    
    .nav-item.btn-admin {
        padding: 6px 12px;
    }
}