/* ===== tofai 官网落地页样式 ===== */
:root{
  --primary:#FF5C8A;
  --primary-dark:#E63E70;
  --primary-light:#FFE9F1;
  --dark:#2A2140;
  --text:#4A4160;
  --text-light:#8A81A3;
  --border:#F2E6EE;
  --bg:#FFFCFE;
  --card:#FFFFFF;
  --shadow:0 10px 28px rgba(255,92,138,.12);
  --radius:18px;
  --maxw:1200px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:"PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  color:var(--text);
  background:var(--bg);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
a{text-decoration:none;color:inherit}
img{max-width:100%;display:block}
section{scroll-margin-top:72px}
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.sec-head{text-align:center;margin-bottom:48px}
.sec-head h2{font-size:34px;color:var(--dark);margin-bottom:10px;letter-spacing:1px}
.sec-head p{color:var(--text-light);font-size:16px}
.sec-head.left{text-align:left;margin-bottom:20px}

/* ===== 顶部导航 ===== */
.nav{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(255,252,254,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--border);transition:box-shadow .3s}
.nav.scrolled{box-shadow:0 6px 20px rgba(42,33,64,.08)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{font-size:24px;font-weight:800;color:var(--primary);letter-spacing:1px;line-height:1}
.nav-menu{display:flex;gap:26px}
.nav-menu a{font-size:15px;color:var(--text);transition:color .25s}
.nav-menu a:hover{color:var(--primary)}
.nav-btn{
  display:inline-block;padding:8px 20px;font-size:14px;font-weight:600;color:#fff;
  background:linear-gradient(135deg,var(--primary),var(--primary-dark));
  border-radius:999px;line-height:1;transition:transform .25s,box-shadow .25s;
}
.nav-btn:hover{transform:translateY(-2px);box-shadow:0 8px 18px rgba(255,92,138,.4)}

/* ===== 首屏 Hero ===== */
.hero{padding:120px 0 70px;background:linear-gradient(180deg,#FFF1F6 0%,var(--bg) 100%)}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
.hero h1{font-size:46px;color:var(--dark);font-weight:800;margin-bottom:22px;letter-spacing:1px}
.hero-desc{font-size:17px;color:var(--text);max-width:560px;margin-bottom:28px}
.hero-persona h3{font-size:17px;color:var(--dark);margin-bottom:16px;font-weight:700}
.persona-strip{display:grid;grid-template-columns:repeat(6,1fr);gap:12px;margin-bottom:32px}
.ps-card{display:flex;flex-direction:column;align-items:center;gap:8px}
.ps-card img{width:100%;aspect-ratio:1;border-radius:16px;object-fit:cover;border:3px solid #fff;box-shadow:0 6px 16px rgba(42,33,64,.10);transition:transform .3s}
.ps-card:hover img{transform:translateY(-4px)}
.ps-card span{font-size:13px;color:var(--text);font-weight:600}
.btn-main{
  display:inline-block;padding:16px 42px;font-size:18px;font-weight:700;color:#fff;text-align:center;
  background:linear-gradient(135deg,var(--primary),var(--primary-dark));
  border-radius:999px;box-shadow:0 12px 26px rgba(255,92,138,.38);
  transition:transform .25s,box-shadow .25s;
}
.btn-main:hover{transform:translateY(-3px);box-shadow:0 16px 34px rgba(255,92,138,.5)}

/* 聊天窗口 */
.hero-chat{justify-self:center;width:100%;max-width:400px}
.chat-window{background:#fff;border-radius:24px;box-shadow:0 24px 60px rgba(42,33,64,.14);border:1px solid var(--border);overflow:hidden}
.chat-head{display:flex;align-items:center;gap:12px;padding:14px 18px;background:linear-gradient(135deg,var(--primary),var(--primary-dark))}
.chat-head img{width:42px;height:42px;border-radius:50%;object-fit:cover;border:2px solid #fff}
.chat-user strong{display:block;color:#fff;font-size:15px}
.chat-user span{font-size:12px;color:rgba(255,255,255,.85)}
.chat-body{padding:18px 16px;background:#F6F3FA;min-height:340px;display:flex;flex-direction:column;gap:14px}
.msg{display:flex;align-items:flex-start;gap:8px;max-width:82%}
.msg.partner{align-self:flex-start}
.msg.mine{align-self:flex-end;flex-direction:row-reverse}
.msg .avatar{width:34px;height:34px;border-radius:50%;overflow:hidden;flex-shrink:0}
.msg .avatar img{width:100%;height:100%;object-fit:cover}
.msg .bubble{padding:10px 14px;font-size:14px;line-height:1.6;word-break:break-word}
.msg.partner .bubble{background:#fff;color:var(--text);border-radius:14px 14px 14px 4px;box-shadow:0 2px 8px rgba(42,33,64,.06)}
.msg.mine .bubble{background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff;border-radius:14px 14px 4px 14px}
.chat-foot{display:flex;align-items:center;gap:10px;padding:12px 16px;background:#fff;border-top:1px solid var(--border)}
.chat-foot .chat-plus{color:var(--text-light);font-size:22px;font-weight:300}
.chat-foot input{flex:1;border:none;outline:none;background:#F3F0F6;border-radius:999px;padding:9px 16px;font-size:14px;color:var(--text);font-family:inherit}
.chat-foot .chat-voice{color:var(--primary);font-size:18px}

/* ===== 三步上手 ===== */
.steps{padding:90px 0}
.steps-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.step-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:36px 30px;transition:transform .3s,box-shadow .3s}
.step-card:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.step-num{font-size:40px;font-weight:800;color:var(--primary-light);line-height:1;margin-bottom:16px}
.step-card h3{font-size:20px;color:var(--dark);margin-bottom:10px}
.step-card p{font-size:15px;color:var(--text-light)}

/* ===== 产品介绍 ===== */
.intro{padding:90px 0;background:#FFF7FA}
.intro-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:56px;align-items:center}
.intro-p{font-size:16px;color:var(--text);margin-bottom:16px}
.intro-list{list-style:none;margin-top:20px}
.intro-list li{font-size:15px;color:var(--dark);padding:10px 0 10px 30px;position:relative;font-weight:600}
.intro-list li::before{content:"✓";position:absolute;left:0;top:10px;color:var(--primary);font-weight:800}
.intro-img img{border-radius:26px;box-shadow:0 24px 60px rgba(255,92,138,.18);width:100%}

/* ===== 四大核心陪伴功能 ===== */
.features{padding:90px 0}
.feat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.feat-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:30px 26px;transition:transform .3s,box-shadow .3s}
.feat-card:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.feat-icon{width:58px;height:58px;border-radius:16px;background:var(--primary-light);display:flex;align-items:center;justify-content:center;font-size:28px;margin-bottom:18px}
.feat-card h3{font-size:19px;color:var(--dark);margin-bottom:10px}
.feat-pain{font-size:13px;color:var(--primary);font-weight:600;margin-bottom:10px}
.feat-card>p:last-child{font-size:14px;color:var(--text-light)}

/* ===== 优势对比 ===== */
.compare{padding:90px 0;background:#FFF7FA}
.cmp-table-wrap{background:#fff;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;box-shadow:0 10px 30px rgba(42,33,64,.06)}
.cmp-table{width:100%;border-collapse:collapse;text-align:center}
.cmp-table th,.cmp-table td{padding:16px 14px;font-size:15px;border-bottom:1px solid var(--border)}
.cmp-table thead th{background:var(--dark);color:#fff;font-weight:600}
.cmp-table thead th.col-tofai{background:linear-gradient(135deg,var(--primary),var(--primary-dark))}
.cmp-table tbody tr:last-child td{border-bottom:none}
.cmp-table tbody tr{transition:background .25s}
.cmp-table tbody tr:hover{background:#FFF6FA}
.cmp-table td{color:var(--text-light)}
.cmp-table td.col-tofai{color:var(--primary-dark);font-weight:700}

/* ===== 使用场景 ===== */
.scenes{padding:90px 0}
.scene-list{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin-bottom:48px}
.scene-item{display:flex;align-items:center;gap:12px;background:var(--card);border:1px solid var(--border);border-radius:14px;padding:16px 20px;font-size:15px;color:var(--text);transition:transform .3s,box-shadow .3s}
.scene-item:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.scene-item span{color:var(--primary);font-weight:800}
.scene-vs{display:grid;grid-template-columns:1fr auto 1fr;gap:20px;align-items:stretch}
.vs-side{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:30px;text-align:center}
.vs-side h4{font-size:18px;color:var(--dark);margin-bottom:12px}
.vs-side p{font-size:14px;color:var(--text-light);line-height:2}
.vs-side.good{border-color:var(--primary);background:linear-gradient(180deg,#FFF2F7,#fff)}
.vs-side.good h4{color:var(--primary)}
.vs-mid{align-self:center;font-size:22px;font-weight:800;color:var(--primary);background:var(--primary-light);width:56px;height:56px;border-radius:50%;display:flex;align-items:center;justify-content:center}

/* ===== 数据模块 ===== */
.data{padding:90px 0;background:linear-gradient(135deg,#FF5C8A,#E63E70)}
.data .sec-head h2{color:#fff}
.data .sec-head p{color:rgba(255,255,255,.85)}
.data-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.data-card{background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.3);border-radius:var(--radius);padding:36px 20px;text-align:center;backdrop-filter:blur(4px)}
.data-num{font-size:42px;font-weight:800;color:#fff;margin-bottom:8px}
.data-card p{font-size:15px;color:rgba(255,255,255,.9)}

/* ===== 人设定制 ===== */
.persona{padding:90px 0;background:#FFF7FA}
.persona-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.pa-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;text-align:center;padding-bottom:24px;transition:transform .3s,box-shadow .3s}
.pa-card:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.pa-card img{width:100%;aspect-ratio:1/1.05;object-fit:cover}
.pa-card h3{font-size:19px;color:var(--dark);margin:16px 0 6px}
.pa-card p{font-size:14px;color:var(--text-light);padding:0 18px}
.pa-card.custom{border-color:var(--primary);background:linear-gradient(180deg,#FFF2F7,#fff)}
.persona-tip{margin-top:34px;text-align:center;font-size:15px;color:var(--text);background:#fff;border:1px solid var(--border);border-radius:14px;padding:20px 28px;line-height:1.9}

/* ===== 用户评价 ===== */
.reviews{padding:90px 0}
.review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.review-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:26px;transition:transform .3s,box-shadow .3s}
.review-card:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.rv-head{display:flex;align-items:center;gap:14px;margin-bottom:14px}
.rv-avatar{width:48px;height:48px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff;font-size:20px;font-weight:700;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.rv-info strong{display:block;font-size:16px;color:var(--dark)}
.rv-stars{color:#FFB800;font-size:14px;letter-spacing:2px}
.review-card>p{font-size:14px;color:var(--text-light)}

/* ===== 隐私安全 ===== */
.privacy{padding:90px 0;background:#FFF7FA}
.priv-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.priv-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:30px 24px;text-align:center;transition:transform .3s,box-shadow .3s}
.priv-card:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.priv-icon{font-size:34px;margin-bottom:14px}
.priv-card h3{font-size:17px;color:var(--dark);margin-bottom:10px}
.priv-card p{font-size:14px;color:var(--text-light)}

/* ===== 版本更新 ===== */
.version{padding:90px 0}
.ver-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:34px 36px;max-width:820px;margin:0 auto;box-shadow:0 10px 30px rgba(42,33,64,.06)}
.ver-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:22px;border-bottom:1px solid var(--border);padding-bottom:18px}
.ver-head h3{font-size:22px;color:var(--dark)}
.ver-date{font-size:14px;color:var(--text-light);margin-top:4px}
.ver-tag{background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff;font-size:13px;padding:5px 14px;border-radius:999px;font-weight:600}
.ver-log{list-style:none}
.ver-log li{font-size:15px;color:var(--text);padding:10px 0 10px 26px;position:relative;border-bottom:1px dashed var(--border)}
.ver-log li:last-child{border-bottom:none}
.ver-log li::before{content:"•";position:absolute;left:6px;color:var(--primary);font-size:20px;font-weight:800}

/* ===== FAQ ===== */
.faq{padding:90px 0;background:#FFF7FA}
.faq-list{max-width:820px;margin:0 auto}
.faq-item{background:var(--card);border:1px solid var(--border);border-radius:14px;margin-bottom:14px;overflow:hidden;transition:box-shadow .3s}
.faq-item.active{box-shadow:var(--shadow)}
.faq-q{width:100%;display:flex;justify-content:space-between;align-items:center;gap:14px;background:none;border:none;cursor:pointer;padding:20px 24px;font-size:16px;font-weight:600;color:var(--dark);font-family:inherit;text-align:left}
.faq-arrow{width:10px;height:10px;border-right:2px solid var(--text-light);border-bottom:2px solid var(--text-light);transform:rotate(45deg);transition:transform .3s;flex-shrink:0}
.faq-item.active .faq-arrow{transform:rotate(225deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .35s ease}
.faq-inner{padding:0 24px 22px;font-size:15px;color:var(--text-light)}

/* ===== 下载区域 ===== */
.download{padding:100px 0;background:linear-gradient(180deg,#FFF1F6 0%,var(--bg) 100%);text-align:center}
.dl-title{font-size:40px;color:var(--dark);font-weight:800;margin-bottom:12px}
.dl-meta{font-size:15px;color:var(--text-light);margin-bottom:36px}
.dl-btns{display:flex;justify-content:center;gap:22px;margin-bottom:28px}
.dl-btn{display:inline-block;padding:16px 44px;font-size:17px;font-weight:700;color:#fff;border-radius:999px;transition:transform .25s,box-shadow .25s}
.dl-btn.android{background:linear-gradient(135deg,var(--primary),var(--primary-dark));box-shadow:0 12px 26px rgba(255,92,138,.35)}
.dl-btn.ios{background:linear-gradient(135deg,#3A2F5C,#2A2140);box-shadow:0 12px 26px rgba(42,33,64,.25)}
.dl-btn:hover{transform:translateY(-3px)}
.dl-btn.android:hover{box-shadow:0 16px 34px rgba(255,92,138,.45)}
.dl-btn.ios:hover{box-shadow:0 16px 34px rgba(42,33,64,.35)}
.dl-tip{font-size:15px;color:var(--text)}

/* ===== 页脚 ===== */
.footer{background:var(--dark);padding:30px 0;text-align:center}
.footer-copy{font-size:14px;color:rgba(255,255,255,.75)}
.footer-copy a{color:#fff;font-weight:600}
.footer-copy a:hover{color:var(--primary)}

/* ===== 返回顶部 ===== */
.to-top{position:fixed;right:24px;bottom:32px;z-index:99;width:48px;height:48px;border:none;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff;font-size:20px;cursor:pointer;opacity:0;visibility:hidden;transform:translateY(12px);transition:opacity .3s,transform .3s,visibility .3s;box-shadow:0 10px 22px rgba(255,92,138,.4)}
.to-top.show{opacity:1;visibility:visible;transform:translateY(0)}
.to-top:hover{transform:translateY(-3px)}

/* ===== 平板适配 ===== */
@media (max-width:1024px){
  .hero-grid{grid-template-columns:1fr;gap:44px}
  .hero-text{text-align:center}
  .hero-desc{margin:0 auto 28px}
  .feat-grid{grid-template-columns:repeat(2,1fr)}
  .review-grid{grid-template-columns:repeat(2,1fr)}
  .priv-grid{grid-template-columns:repeat(2,1fr)}
  .data-grid{grid-template-columns:repeat(2,1fr)}
  .intro-grid{grid-template-columns:1fr;gap:40px}
  .intro-img{max-width:420px;margin:0 auto}
  .nav-menu{gap:16px}
  .nav-menu a{font-size:14px}
}

/* ===== 手机适配 ===== */
@media (max-width:768px){
  .container{padding:0 20px}
  .sec-head{margin-bottom:34px}
  .sec-head h2{font-size:26px}
  .nav-menu{display:none}
  .nav-btn{font-size:13px;padding:7px 16px}
  .hero{padding:100px 0 50px}
  .hero h1{font-size:30px}
  .hero-desc{font-size:15px}
  .persona-strip{grid-template-columns:repeat(3,1fr)}
  .ps-card span{font-size:12px}
  .btn-main{width:100%;font-size:16px;padding:15px 20px}
  .steps-grid,.feat-grid,.persona-grid,.review-grid,.priv-grid,.data-grid{grid-template-columns:1fr}
  .steps{padding:60px 0}
  .intro,.features,.compare,.scenes,.persona,.reviews,.privacy,.version,.faq,.download{padding:60px 0}
  .scene-list{grid-template-columns:1fr}
  .scene-vs{grid-template-columns:1fr;gap:16px}
  .vs-mid{width:44px;height:44px;font-size:18px;margin:0 auto}
  .cmp-table thead{display:none}
  .cmp-table,.cmp-table tbody,.cmp-table tr,.cmp-table td{display:block;width:100%}
  .cmp-table tbody tr{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:0 14px 12px;margin-bottom:14px;box-shadow:0 4px 14px rgba(42,33,64,.05)}
  .cmp-table tbody tr:last-child{margin-bottom:0}
  .cmp-table tbody td{border:none;padding:9px 6px;text-align:left;display:flex;align-items:center;gap:10px;font-size:14px}
  .cmp-table tbody td:first-child{display:block;font-size:16px;color:var(--dark);font-weight:700;border-bottom:1px dashed var(--border);padding:14px 6px 10px;margin-bottom:2px}
  .cmp-table td[data-label]::before{content:attr(data-label);flex-shrink:0;font-size:12px;font-weight:600;line-height:1;color:var(--text-light);background:var(--border);border-radius:999px;padding:5px 11px}
  .cmp-table td.col-tofai::before{background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff}
  .data-card{padding:26px 16px}
  .data-num{font-size:32px}
  .ver-card{padding:24px 20px}
  .ver-head{flex-direction:column;align-items:flex-start;gap:10px}
  .faq-q{font-size:15px;padding:18px 18px}
  .faq-inner{padding:0 18px 20px}
  .dl-title{font-size:28px}
  .dl-meta{font-size:12px;white-space:nowrap;overflow:hidden}
  .dl-btns{flex-direction:column;gap:16px;padding:0 20px}
  .dl-btn{width:100%;text-align:center;padding:15px 20px;font-size:16px}
  .to-top{right:16px;bottom:24px;width:44px;height:44px}
}