*{margin:0;padding:0;box-sizing:border-box;font-family:"Microsoft YaHei",system-ui,sans-serif;}
body{background:#fff;color:#222;min-width:1200px;}
ul{list-style:none;}
a{text-decoration:none;color:inherit;}
button{border:0;background:none;cursor:pointer;font-family:inherit;}
.container{width:1200px;margin:0 auto;}
/* ===== 独立头部（可整体替换） ===== */
.page-header{width:100%;border-bottom:1px solid #f1f1f1;height:64px;}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:100%;padding:0 20px;}
.nav-logo{display:flex;align-items:center;gap:8px;font-weight:bold;font-size:18px;}
.nav-logo-icon{width:28px;height:28px;background:#28b973;border-radius:6px;}
.nav-menu{display:flex;gap:36px;font-size:15px;color:#444;}
.nav-right{display:flex;gap:20px;align-items:center;}
.btn-black{background:#111;color:#fff;padding:7px 18px;border-radius:20px;font-size:14px;}
.btn-text{font-size:15px;}
/* ===== Hero首屏 ===== */
.hero-section{padding:50px 0 70px;text-align:center;}
.hero-title{font-size:58px;font-weight:bold;margin-bottom:14px;}
.hero-title .loop-text{color:#28b973;}
.hero-desc{width:720px;margin:0 auto 30px;font-size:16px;color:#666;line-height:1.6;}
.hero-buttons{display:flex;gap:16px;justify-content:center;margin-bottom:40px;}
.btn-green{background:#28b973;color:#fff;padding:11px 28px;border-radius:8px;font-size:16px;}
.btn-outline{border:1px solid #28b973;color:#28b973;padding:11px 28px;border-radius:8px;font-size:16px;}
/* ===== 工作台左右分栏【修复：左侧菜单去掉滚动条，全部完整显示】 ===== */
.mock-work-wrap{
    width:980px;background:#fff;border-radius:14px;
    box-shadow:0 8px 30px rgba(0,0,0,0.08);margin:0 auto;
    display:flex;overflow:hidden;border:1px solid #d8d9db;
}
.mock-left-menu{
    width:230px;background:#f3f4f5;padding:16px 0;
    display:flex;flex-direction:column;
    overflow:visible;
}
.mock-menu-main{
    padding:9px 16px;margin:2px 8px;border-radius:6px;
    font-size:14px;cursor:pointer;display:flex;align-items:center;gap:10px;
}
.mock-menu-main.active{background:#e1e3e6;}
.mock-menu-main:hover{background:#e1e3e6;}
/* 分组标题：任务、工作空间 强制靠左 */
.mock-group-title{
    font-size:12px;color:#666;margin:20px 12px 6px 12px;text-align:left;
}
.mock-task-item{
    padding:7px 16px 7px 32px;margin:1px 8px;font-size:13.5px;
    display:flex;align-items:center;gap:8px;border-radius:6px;cursor:pointer;
}
.mock-task-item:hover{background:#e1e3e6;}
.mock-space-item{
    padding:7px 16px 7px 32px;margin:1px 8px;font-size:13.5px;
    display:flex;align-items:center;border-radius:6px;cursor:pointer;
}
.mock-space-item:hover{background:#e1e3e6;}
.arrow-right{margin-left:auto;color:#999;font-size:14px;}
.mock-right-preview{flex:1;background:#fff;position:relative;min-height:540px;}
.mock-preview-img{
    width:100%;height:100%;
    background-size:contain;
    background-repeat:no-repeat;
    background-position:center;
    background-color:#ffffff;
    opacity:1;transition:opacity 0.35s ease;
}
/*禁止点击的项：去掉小手hover效果*/
.mock-menu-main:not([data-id="report"]):not([data-id="topic"]):not([data-id="sample"]):not([data-id="ref"]):not([data-id="ppt"]){
    cursor:default;
}
.mock-menu-main:not([data-id="report"]):not([data-id="topic"]):not([data-id="sample"]):not([data-id="ref"]):not([data-id="ppt"]):hover{
    background:transparent;
}
.mock-task-item,.mock-space-item{
    cursor:default;
}
.mock-task-item:hover,.mock-space-item:hover{
    background:transparent;
}
/* ===== FreeDetect打通腾讯生态【彻底修复圆心偏移问题】 ===== */
.circle-section{padding:80px 0;text-align:center;position:relative;}
.circle-title{font-size:46px;font-weight:bold;margin-bottom:12px;}
.circle-sub{font-size:16px;color:#777;margin-bottom:16px;max-width:900px;margin-left:auto;margin-right:auto;line-height:1.7;}
.circle-desc{font-size:15px;color:#808080;margin-bottom:70px;max-width:880px;margin-left:auto;margin-right:auto;line-height:1.8;}
.circle-wrap{width:720px;height:720px;margin:0 auto;position:relative;}
/* 外圈淡虚线圆环背景 */
.circle-bg-dash{
    position:absolute;left:50%;top:50%;width:640px;height:640px;
    transform:translate(-50%,-50%);
    border:1px dashed #dcf3e8;border-radius:50%;
}
.circle-bg-inner{
    position:absolute;left:50%;top:50%;width:440px;height:440px;
    transform:translate(-50%,-50%);
    background:#e8f7ef24;border-radius:50%;
}
.circle-center{
    position:absolute;width:190px;height:190px;left:50%;top:50%;
    transform:translate(-50%,-50%);z-index:3;
    /* cover改成 contain */
    background:url("../images/lunbo.png") center/contain no-repeat;
    background-color: transparent;
    border-radius:50%;
}

/* 【关键修复】旋转容器定位到circle-wrap正中心，原点在圆心 */
.circle-rotate-container{
    position:absolute;
    left:50%;
    top:50%;
    width:0;
    height:0;
}
.circle-tag{
    position:absolute;
    left:0;
    top:0;
}
.circle-tag-inner{
    background:#ffffff;
    box-shadow:0 6px 18px rgba(0,0,0,0.09);
    padding:14px 22px;
    border-radius:999px;
    display:flex;align-items:center;gap:12px;
    white-space:nowrap;
    font-size:25px;
    transform:translate(-50%, -50%);
}
.tag-icon{
    width:44px;height:44px;border-radius:50%;
    flex-shrink:0;overflow:hidden;
}
.tag-icon img{width:100%;height:100%;object-fit:cover;}
/* ===== 降AI引擎板块 ===== */
.ai-reduce-section{padding:60px 0;background:#f8fafc;}
.ai-title{text-align:center;font-size:46px;font-weight:bold;margin-bottom:12px;}
.ai-sub{text-align:center;color:#666;font-size:15px;margin-bottom:40px;}
.ai-content{display:flex;gap:30px;align-items:center;}
.ai-left{width:420px;}
.ai-left h3{font-size:22px;margin-bottom:14px;}
.ai-left p{color:#666;font-size:15px;margin-bottom:20px;line-height:1.6;}
.ai-list>div{display:flex;gap:10px;margin-bottom:12px;font-size:15px;color:#444;}
.ai-right{flex:1;height:440px;background:#fff;border-radius:14px;box-shadow:0 4px 18px rgba(0,0,0,0.06);
background-image:url("../images/jiangai.webp");
background-size:cover;background-position:center;
}
/* ===== 用户评价 4列网格 ===== */
.review-section{padding:70px 0;}
.review-title{text-align:center;font-size:44px;font-weight:bold;margin-bottom:10px;}
.review-sub{text-align:center;color:#666;font-size:15px;margin-bottom:45px;}
.review-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;}
.review-card{
    background:#fff;border-radius:16px;padding:24px 22px;
    box-shadow:0 2px 12px rgba(0,0,0,0.05);border:1px solid #f0f2f5;height:100%;
}
.review-header{display:flex;align-items:center;gap:12px;margin-bottom:16px;}
.review-avatar{width:44px;height:44px;border-radius:50%;background:#e9ecef;overflow:hidden;}
.review-avatar img{width:100%;height:100%;object-fit:cover;}
.review-name{font-weight:600;font-size:16px;color:#222;}
.review-text{font-size:14.5px;color:#495057;line-height:1.75;}
/* ===== FAQ常见问题（修复bug3：点击展开） ===== */
.faq-section{padding:60px 0;background:#f7f9fb;}
.faq-title{text-align:center;font-size:44px;font-weight:bold;margin-bottom:40px;}
.faq-two-col{display:grid;grid-template-columns:1fr 1fr;gap:24px;}
.faq-item{background:#fff;border-radius:12px;border:1px solid #e4e7ec;overflow:hidden;margin-bottom:14px;}
.faq-question{
    padding:18px 22px;display:flex;justify-content:space-between;align-items:center;
    font-size:16px;color:#222;cursor:pointer;user-select:none;
}
.faq-question:hover{background:#f9fafb;}
.faq-question .arrow{
    width:10px;height:10px;border-right:2px solid #666;border-bottom:2px solid #666;
    transform:rotate(45deg);transition:transform 0.35s ease;flex-shrink:0;margin-left:10px;
}
.faq-item.open .faq-question .arrow{transform:rotate(-135deg);}
.faq-answer{
    max-height:0;overflow:hidden;font-size:15px;color:#52525b;line-height:1.75;
    padding:0 22px;transition:max-height 0.4s ease;
}
.faq-item.open .faq-answer{max-height:500px;padding:0 22px 20px 22px;}
/* ===== 底部CTA banner ===== */
.bottom-banner{padding:70px 0;background:#fff;}
.banner-inner{display:flex;align-items:center;justify-content:space-between;}
.banner-text h2{font-size:44px;font-weight:bold;margin-bottom:14px;}
.banner-text p{color:#666;font-size:15px;margin-bottom:24px;max-width:480px;}
.banner-img-box{width:520px;height:350px;background:#e1e8f000;border-radius:12px;
background-image:url("../images/weibu.webp");
background-size:cover;background-position:center;
}
/* ===== 独立页脚（可整体替换） ===== */
.page-footer{width:100%;background:#f7f8fa;padding:50px 0 30px;}
.footer-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:30px;}
.footer-col h4{font-size:15px;margin-bottom:16px;}
.footer-col li{font-size:14px;color:#666;margin-bottom:10px;}
/* ===== FreeDetect AI写作辅助工具与其他AI论文写作工具的对比 ===== */
.compare-section {
    padding: 70px 0;
    background: #f8fafc;
}
.compare-title {
    text-align: center;
    font-size: 44px;
    font-weight: bold;
    margin-bottom: 10px;
}
.compare-sub {
    text-align: center;
    color: #666;
    font-size: 15px;
    margin-bottom: 45px;
}
.compare-table-wrap {
    background: #ffffff;
    border-radius: 16px;
    box-shadow: 0 2px 14px rgba(0,0,0,0.06);
    overflow: hidden;
    border: 1px solid #e4e7ec;
}
.compare-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14.5px;
}
.compare-table thead tr {
    background: #28b973;
    color: #ffffff;
}
.compare-table th {
    padding: 18px 14px;
    text-align: left;
    font-weight: 600;
    border: 1px solid #28b973;
}
.compare-table td {
    padding: 16px 14px;
    border: 1px solid #eee;
}
.compare-table tbody tr td:first-child {
    background: #f9fafb;
    font-weight: 600;
}
.compare-seo-text {
    margin-top: 36px;
    background: #ffffff;
    padding: 26px 30px;
    border-radius: 14px;
    border: 1px solid #e4e7ec;
}
.compare-seo-text h4 {
    font-size: 18px;
    margin-bottom: 14px;
    color: #222;
}
.compare-seo-text p {
    font-size: 15px;
    line-height: 1.7;
    color: #555;
}
/* 简单适配移动端，表格横向滚动 */
@media(max-width:768px){
    .compare-title{
        font-size:26px;
    }
    .compare-table-wrap{
        overflow-x:auto;
    }
    .compare-table{
        min-width:900px;
    }
    .compare-section{
        padding:40px 0;
    }
}