/* ===== talai 官网落地页样式 ===== */
:root{
  --primary:#FF5C8A;
  --primary-deep:#F03D74;
  --primary-soft:#FFE4EE;
  --deep:#2A1A3D;
  --text:#3E2C50;
  --muted:#6F5E7C;
  --bg:#FFF9FB;
  --bg-soft:#FFF0F6;
  --card:#FFFFFF;
  --border:#F4D8E5;
  --green:#2EC57E;
  --radius:18px;
  --shadow:0 10px 30px rgba(240,61,116,.08);
  --shadow-hover:0 18px 42px rgba(240,61,116,.16);
  --font:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:72px}
body{font-family:var(--font);color:var(--text);background:var(--bg);line-height:1.7;-webkit-font-smoothing:antialiased}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer;border:none;background:none}
ul{list-style:none}
.container{max-width:1200px;margin:0 auto;padding:0 24px}

/* 按钮 */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;border-radius:999px;padding:12px 30px;font-size:16px;font-weight:600;transition:transform .25s,box-shadow .25s;box-shadow:0 8px 20px rgba(240,61,116,.25);white-space:nowrap}
.btn:hover{transform:translateY(-3px);box-shadow:0 14px 30px rgba(240,61,116,.35)}
.btn-lg{padding:15px 42px;font-size:17px}

/* 卡片通用 */
.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);transition:transform .25s,box-shadow .25s}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}

/* ===== 1. 导航 ===== */
.nav{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(255,255,255,.92);backdrop-filter:blur(10px);transition:box-shadow .25s}
.nav.scrolled{box-shadow:0 4px 20px rgba(42,26,61,.08)}
.nav-inner{display:flex;align-items:center;gap:28px;height:64px}
.nav-logo{font-size:24px;font-weight:800;background:linear-gradient(90deg,var(--primary),var(--primary-deep));-webkit-background-clip:text;background-clip:text;color:transparent;letter-spacing:.5px}
.nav-menu{display:flex;align-items:center;gap:26px;margin-left:auto}
.nav-menu a{font-size:15px;color:var(--text);position:relative;transition:color .2s}
.nav-menu a:hover{color:var(--primary)}
.nav-menu a::after{content:"";position:absolute;left:0;bottom:-4px;width:0;height:2px;border-radius:2px;background:var(--primary);transition:width .25s}
.nav-menu a:hover::after{width:100%}
.nav-download{padding:8px 18px;font-size:13px;box-shadow:0 4px 12px rgba(240,61,116,.22)}

/* ===== 2. Hero ===== */
.hero{background:linear-gradient(180deg,var(--bg-soft),var(--bg));padding:120px 0 60px}
.hero-wrap{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
.hero-intro h1{font-size:44px;line-height:1.3;color:var(--deep);font-weight:800}
.hero-intro .ver{font-size:20px;font-weight:700;color:var(--primary);background:var(--primary-soft);border-radius:999px;padding:4px 14px;vertical-align:middle;margin-left:6px}
.hero-desc{font-size:17px;color:var(--muted);margin:20px 0 30px;max-width:520px}

/* 聊天窗口 */
.chat{background:var(--card);border:1px solid var(--border);border-radius:22px;box-shadow:0 20px 50px rgba(240,61,116,.16);overflow:hidden;max-width:420px;width:100%;margin:0 auto}
.chat-head{display:flex;align-items:center;gap:12px;padding:14px 18px;background:linear-gradient(90deg,var(--primary),var(--primary-deep))}
.chat-head img{width:44px;height:44px;border-radius:50%;border:2px solid #fff;object-fit:cover}
.chat-user{line-height:1.35}
.chat-name{color:#fff;font-weight:700;font-size:15px}
.chat-status{color:rgba(255,255,255,.92);font-size:12px;display:flex;align-items:center;gap:5px}
.chat-status .dot{width:7px;height:7px;border-radius:50%;background:var(--green);box-shadow:0 0 0 3px rgba(46,197,126,.35);display:inline-block}
.chat-body{height:330px;overflow-y:auto;padding:18px;background:var(--bg);display:flex;flex-direction:column;gap:12px}
.msg{max-width:80%;padding:10px 14px;border-radius:16px;font-size:14px;line-height:1.6;animation:msgIn .3s ease}
@keyframes msgIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.msg.ai{align-self:flex-start;background:var(--card);border:1px solid var(--border);border-bottom-left-radius:4px}
.msg.user{align-self:flex-end;background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;border-bottom-right-radius:4px}
.chat-input{display:flex;align-items:center;gap:10px;padding:12px 14px;border-top:1px solid var(--border);background:var(--card)}
.chat-input input{flex:1;height:44px;border:1px solid var(--border);border-radius:999px;padding:0 16px;font-size:16px;color:var(--muted);background:var(--bg);outline:none;cursor:default}
.chat-input button{width:44px;height:44px;border-radius:50%;flex-shrink:0;display:flex;align-items:center;justify-content:center;background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;transition:transform .2s}
.chat-input button:hover{transform:scale(1.06)}
.chat-input button.disabled{background:#D8CBDD;cursor:not-allowed;transform:none}

/* 人设挑选 */
.hero-personas{margin-top:56px;text-align:center}
.hero-personas-title{font-size:18px;font-weight:700;color:var(--deep);margin-bottom:24px}
.persona-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:20px}
.persona{display:flex;flex-direction:column;align-items:center;gap:12px}
.persona img{width:120px;height:120px;border-radius:50%;object-fit:cover;border:3px solid #fff;box-shadow:var(--shadow);transition:transform .25s,box-shadow .25s}
.persona:hover img{transform:translateY(-6px);box-shadow:var(--shadow-hover)}
.persona p{font-size:14px;color:var(--text);font-weight:600}

/* ===== 3. 三步上手 ===== */
.steps-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.step-card{padding:36px 30px;text-align:center}
.step-num{width:56px;height:56px;margin:0 auto 18px;border-radius:16px;background:var(--primary-soft);color:var(--primary-deep);font-size:22px;font-weight:800;display:flex;align-items:center;justify-content:center}
.step-card h3{font-size:20px;color:var(--deep);margin-bottom:10px}
.step-card p{color:var(--muted);font-size:15px}

/* ===== 通用区块 ===== */
.section{padding:90px 0}
.section.alt{background:var(--bg-soft)}
.sec-title{font-size:34px;font-weight:800;color:var(--deep);text-align:center;line-height:1.4}
.sec-sub{text-align:center;color:var(--muted);font-size:16px;margin:12px 0 44px}

/* ===== 4. 产品介绍 / 9. 人设定制 ===== */
.split{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.split.reverse .split-media{order:2}
.split-media img{border-radius:var(--radius);box-shadow:var(--shadow);width:100%;height:auto}
.split-text h2{font-size:32px;font-weight:800;color:var(--deep);line-height:1.4;margin-bottom:16px}
.split-text .lead{color:var(--muted);font-size:16px;margin-bottom:22px}
.check-list li{position:relative;padding:8px 0 8px 32px;font-size:16px;color:var(--text)}
.check-list li::before{content:"✔";position:absolute;left:0;top:8px;width:22px;height:22px;border-radius:50%;background:var(--primary-soft);color:var(--primary-deep);font-size:12px;display:flex;align-items:center;justify-content:center;font-weight:700}

/* ===== 5. 四大核心功能 ===== */
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.feature{padding:32px 26px}
.feature-icon{width:52px;height:52px;border-radius:14px;background:var(--primary-soft);color:var(--primary-deep);display:flex;align-items:center;justify-content:center;margin-bottom:18px}
.feature h3{font-size:19px;color:var(--deep);margin-bottom:10px}
.feature .pain{font-size:13px;color:var(--primary-deep);background:var(--bg-soft);border-radius:8px;padding:6px 10px;margin-bottom:12px;display:inline-block}
.feature p{font-size:14.5px;color:var(--muted)}

/* ===== 6. 优势对比 ===== */
.table-wrap{overflow-x:auto;border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);background:var(--card)}
.compare{width:100%;border-collapse:collapse;font-size:15px}
.compare th{background:var(--deep);color:#fff;padding:16px 20px;text-align:left;font-weight:600;white-space:nowrap}
.compare td{padding:15px 20px;border-top:1px solid var(--border);color:var(--muted);white-space:nowrap}
.compare tbody tr:hover td{background:var(--bg-soft)}
.compare td:first-child{font-weight:600;color:var(--text)}
.compare .hl{color:var(--primary-deep);font-weight:700}
.table-hint{display:none;text-align:center;color:var(--muted);font-size:13px;margin-top:12px}

/* ===== 7. 使用场景 ===== */
.scene-list{display:grid;grid-template-columns:repeat(2,1fr);gap:16px 40px;max-width:980px;margin:0 auto 48px}
.scene-list li{display:flex;align-items:center;gap:12px;font-size:16px;color:var(--text);padding:14px 18px;background:var(--card);border:1px solid var(--border);border-radius:14px;box-shadow:var(--shadow)}
.scene-list .tick{width:24px;height:24px;border-radius:50%;background:var(--primary-soft);color:var(--primary-deep);font-size:13px;display:flex;align-items:center;justify-content:center;flex-shrink:0;font-weight:700}
.vs{display:grid;grid-template-columns:1fr auto 1fr;gap:24px;align-items:stretch;max-width:980px;margin:0 auto}
.vs-card{padding:32px 30px}
.vs-alone h3{color:var(--muted);font-size:19px;margin-bottom:12px}
.vs-with h3{color:var(--primary-deep);font-size:19px;margin-bottom:12px}
.vs-with{border-color:var(--primary);box-shadow:0 10px 30px rgba(240,61,116,.14)}
.vs-card p{color:var(--muted);font-size:15px}
.vs-mid{align-self:center;width:52px;height:52px;border-radius:50%;background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;font-weight:800;display:flex;align-items:center;justify-content:center;font-size:14px}

/* ===== 8. 数据 ===== */
.stats{background:linear-gradient(135deg,var(--deep),#45275F);padding:80px 0}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;text-align:center}
.stat-num{font-size:46px;font-weight:800;color:#fff;line-height:1.2}
.stat p:last-child{color:rgba(255,255,255,.75);font-size:15px;margin-top:6px}

/* ===== 10. 用户评价 ===== */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.review{padding:28px 26px}
.review-head{display:flex;align-items:center;gap:14px;margin-bottom:14px}
.avatar{width:48px;height:48px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--primary-deep));color:#fff;font-size:19px;font-weight:700;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.review-name{font-weight:700;color:var(--deep);font-size:15px}
.stars{color:#FFB800;font-size:14px;letter-spacing:2px}
.review-text{font-size:14.5px;color:var(--muted)}

/* ===== 11. 隐私安全 ===== */
.privacy{padding:32px 26px;text-align:left}
.privacy-icon{width:50px;height:50px;border-radius:14px;background:var(--primary-soft);color:var(--primary-deep);display:flex;align-items:center;justify-content:center;margin-bottom:16px}
.privacy h3{font-size:18px;color:var(--deep);margin-bottom:10px}
.privacy p{font-size:14.5px;color:var(--muted)}

/* ===== 12. 版本更新 ===== */
.version{display:grid;grid-template-columns:280px 1fr;gap:36px;padding:38px 36px;max-width:980px;margin:0 auto}
.version-info{text-align:center;border-right:1px solid var(--border);display:flex;flex-direction:column;justify-content:center;gap:10px}
.version-no{font-size:36px;font-weight:800;color:var(--primary-deep)}
.version-date{font-size:14px;color:var(--muted)}
.version-log{display:flex;flex-direction:column;gap:14px}
.version-log li{display:flex;align-items:flex-start;gap:12px;font-size:15px;color:var(--text)}
.tag-new,.tag-opt,.tag-fix{flex-shrink:0;font-size:12px;padding:2px 10px;border-radius:999px;font-weight:600;margin-top:2px}
.tag-new{background:var(--primary-soft);color:var(--primary-deep)}
.tag-opt{background:#EAF6FF;color:#2E8BD6}
.tag-fix{background:#EAFBF2;color:var(--green)}

/* ===== 13. FAQ ===== */
.faq{max-width:820px;margin:0 auto;display:flex;flex-direction:column;gap:16px}
.faq-item{overflow:hidden}
.faq-q{width:100%;display:flex;justify-content:space-between;align-items:center;gap:16px;padding:20px 26px;font-size:16.5px;font-weight:600;color:var(--deep);text-align:left;background:var(--card);border-radius:var(--radius)}
.faq-arrow{width:28px;height:28px;border-radius:50%;background:var(--primary-soft);position:relative;flex-shrink:0;transition:transform .3s}
.faq-arrow::before,.faq-arrow::after{content:"";position:absolute;background:var(--primary-deep);border-radius:2px}
.faq-arrow::before{width:12px;height:2px;top:13px;left:8px}
.faq-arrow::after{width:2px;height:12px;top:8px;left:13px}
.faq-item.open .faq-arrow{transform:rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .35s ease}
.faq-a p{padding:0 26px 22px;color:var(--muted);font-size:15px}

/* ===== 14. 下载区域 ===== */
.download{background:linear-gradient(135deg,var(--primary),var(--primary-deep));padding:90px 0;text-align:center}
.download h1{font-size:40px;font-weight:800;color:#fff}
.download h1 .ver{font-size:19px;background:rgba(255,255,255,.22);color:#fff;border-radius:999px;padding:4px 14px;vertical-align:middle;margin-left:6px}
.download-meta{color:rgba(255,255,255,.9);font-size:14px;margin:14px 0 34px}
.download-btns{display:flex;justify-content:center;gap:20px}
.download .btn{background:#fff;color:var(--primary-deep);box-shadow:0 10px 26px rgba(42,26,61,.22)}
.download .btn:hover{box-shadow:0 16px 34px rgba(42,26,61,.3)}
.download-tip{color:rgba(255,255,255,.95);font-size:15px;margin-top:26px}

/* ===== 15. 页脚 ===== */
.footer{background:var(--deep);color:rgba(255,255,255,.7);text-align:center;padding:26px 0;font-size:14px}
.footer a{color:#fff;font-weight:600}

/* ===== 16. 返回顶部 ===== */
.to-top{position:fixed;right:26px;bottom:30px;width:48px;height:48px;border-radius:50%;background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;display:flex;align-items:center;justify-content:center;box-shadow:0 10px 24px rgba(240,61,116,.35);opacity:0;visibility:hidden;transform:translateY(14px);transition:opacity .3s,transform .3s,visibility .3s;z-index:90}
.to-top.show{opacity:1;visibility:visible;transform:none}
.to-top:hover{transform:translateY(-3px)}

/* ===== 响应式 ===== */
@media (max-width:1100px){
  .persona-grid{grid-template-columns:repeat(3,1fr)}
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .grid-3{grid-template-columns:repeat(2,1fr)}
  .hero-intro h1{font-size:38px}
  .sec-title{font-size:30px}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:900px){
  .nav-menu{display:none}
  .nav-inner{justify-content:space-between}
  .hero{padding:100px 0 50px}
  .hero-wrap{grid-template-columns:1fr;gap:44px}
  .hero-intro{text-align:center}
  .hero-desc{margin-left:auto;margin-right:auto}
  .split{grid-template-columns:1fr;gap:36px}
  .split.reverse .split-media{order:0}
  .split-text{text-align:center}
  .check-list{text-align:left;max-width:480px;margin:0 auto 8px}
  .steps-grid{grid-template-columns:1fr;gap:18px}
  .scene-list{grid-template-columns:1fr;gap:12px}
  .vs{grid-template-columns:1fr;gap:16px}
  .vs-mid{margin:0 auto}
  .version{grid-template-columns:1fr;gap:26px;padding:32px 26px}
  .version-info{border-right:none;border-bottom:1px solid var(--border);padding-bottom:22px}
}
@media (max-width:768px){
  .container{padding:0 20px}
  .section{padding:64px 0}
  .nav-inner{height:60px}
  .nav-logo{font-size:22px;display:inline-flex;align-items:center;min-height:44px;padding:4px 0}
  .nav-download{padding:13px 16px;font-size:12.5px;min-height:44px}
  .hero-intro h1{font-size:30px}
  .hero-intro .ver{font-size:15px}
  .hero-desc{font-size:15px}
  .chat{max-width:100%}
  .chat-body{height:280px}
  .sec-title{font-size:26px}
  .compare{min-width:640px}
  .table-hint{display:block}
  .download-btns{flex-direction:column;gap:14px}
  .download .btn{width:100%;padding:14px 20px;font-size:15px}
  .download-meta{font-size:12.5px;margin:12px 0 26px}
  .download-tip{font-size:13.5px}
  .to-top{right:16px;bottom:22px;width:44px;height:44px}
}
@media (max-width:640px){
  .persona-grid{grid-template-columns:repeat(2,1fr);gap:18px}
  .grid-4,.grid-3{grid-template-columns:1fr}
  .persona img{width:104px;height:104px}
  .stat-num{font-size:36px}
  .btn-lg{padding:14px 28px;font-size:16px;width:100%}
  .download h1{font-size:29px}
  .download h1 .ver{font-size:14px}
}