/* ===== feelin 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;
  --gold:#FFB83D;
  --radius:18px;
  --shadow:0 10px 30px rgba(240,61,116,.08);
  --shadow-hover:0 18px 42px rgba(240,61,116,.16);
  --grad:linear-gradient(90deg,var(--primary),var(--primary-deep));
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:80px}
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;background:var(--bg);color:var(--text);font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}
ul{list-style:none}
button{font-family:inherit}
a:focus-visible,button:focus-visible{outline:2px solid var(--primary);outline-offset:2px}
.wrap{max-width:1180px;margin:0 auto;padding:0 24px}

/* 通用卡片与按钮 */
.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)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:var(--grad);color:#fff;border:0;border-radius:999px;font-weight:600;cursor:pointer;transition:transform .25s,box-shadow .25s}
.btn:hover{transform:translateY(-2px);box-shadow:0 14px 30px rgba(240,61,116,.35)}
.btn-lg{padding:16px 38px;font-size:17px}
.btn-sm{padding:9px 20px;font-size:14px;min-height:40px}

/* 区块标题 */
.sec-head{text-align:center;margin-bottom:48px}
.sec-tag{display:inline-block;padding:6px 16px;background:var(--primary-soft);color:var(--primary-deep);font-size:13px;font-weight:600;border-radius:999px;margin-bottom:14px}
.sec-head h2{font-size:34px;color:var(--deep);font-weight:800;line-height:1.3}
.sec-head p{color:var(--muted);margin-top:12px;font-size:15px}

/* 1 导航 */
.nav{position:fixed;top:0;left:0;right:0;z-index:100;height:68px;background:rgba(255,249,251,.92);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid transparent;transition:box-shadow .25s,border-color .25s}
.nav.scrolled{border-color:var(--border);box-shadow:0 6px 24px rgba(240,61,116,.08)}
.nav-inner{max-width:1180px;margin:0 auto;padding:0 24px;height:68px;display:flex;align-items:center;justify-content:space-between;gap:20px}
.logo{display:inline-flex;align-items:center;gap:8px;font-size:26px;font-weight:800;color:var(--deep);line-height:1;flex-shrink:0}
.logo svg{width:24px;height:24px}
.nav-menu{display:flex;align-items:center;gap:2px}
.nav-menu a{padding:8px 11px;font-size:14px;color:var(--text);border-radius:10px;transition:color .2s,background .2s;white-space:nowrap}
.nav-menu a:hover{color:var(--primary-deep);background:var(--primary-soft)}

/* 2 Hero */
.hero{background:linear-gradient(160deg,#FFE4EE 0%,#FFF9FB 55%,#FFF0F6 100%);padding:148px 0 76px;overflow:hidden}
.hero-grid{display:grid;grid-template-columns:1.02fr .98fr;gap:56px;align-items:center}
.hero h1{font-size:50px;font-weight:800;color:var(--deep);line-height:1.18}
.hero h1 .hl{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.ver-pill{display:inline-block;vertical-align:middle;margin-left:10px;padding:6px 16px;background:var(--primary-soft);border:1px solid var(--border);color:var(--primary-deep);font-size:15px;font-weight:700;border-radius:999px}
.hero-desc{margin:22px 0 0;font-size:17px;color:var(--muted);line-height:1.9;max-width:520px}
.hero-left .btn-lg{margin-top:30px}
.hero-tip{width:100%;margin-top:14px;font-size:14px;color:var(--muted)}

/* 聊天窗口 */
.chat{background:#fff;border:1px solid var(--border);border-radius:22px;box-shadow:0 20px 50px rgba(240,61,116,.16);overflow:hidden}
.chat-head{background:linear-gradient(120deg,#3A2457,#2A1A3D);padding:16px 18px;display:flex;align-items:center;gap:12px}
.chat-head img{width:48px;height:48px;border-radius:50%;border:2px solid rgba(255,255,255,.35);object-fit:cover}
.chat-head-info{min-width:0}
.chat-name{color:#fff;font-weight:700;font-size:16px}
.chat-status{display:flex;align-items:center;gap:6px;color:rgba(255,255,255,.75);font-size:12px;margin-top:2px}
.chat-status .dot{width:7px;height:7px;border-radius:50%;background:var(--green);box-shadow:0 0 0 3px rgba(46,197,126,.28)}
.chat-body{height:342px;overflow-y:auto;background:#FFF5F8;padding:18px 16px;display:flex;flex-direction:column;gap:12px}
.chat-body::-webkit-scrollbar{width:5px}
.chat-body::-webkit-scrollbar-thumb{background:var(--border);border-radius:4px}
.msg{max-width:80%;padding:11px 15px;font-size:14px;line-height:1.65;border-radius:16px;word-break:break-word;animation:msgIn .3s ease}
@keyframes msgIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.msg.ai{background:#fff;border:1px solid var(--border);border-top-left-radius:5px;align-self:flex-start;color:var(--text)}
.msg.user{background:var(--grad);color:#fff;border-top-right-radius:5px;align-self:flex-end}
.chat-input{display:flex;align-items:center;gap:10px;padding:12px 14px;background:#fff;border-top:1px solid var(--border)}
.chat-input input{flex:1;height:44px;border:1px solid var(--border);border-radius:999px;padding:0 18px;font-size:14px;color:var(--muted);background:var(--bg);outline:none;cursor:default}
.chat-input button{height:44px;min-width:80px;border:0;border-radius:999px;background:var(--grad);color:#fff;font-size:15px;font-weight:600;cursor:pointer;transition:transform .25s,box-shadow .25s}
.chat-input button:hover{transform:translateY(-2px);box-shadow:0 8px 20px rgba(240,61,116,.35)}
.chat-input button.disabled{background:#DCCCD8;cursor:not-allowed;transform:none;box-shadow:none}

/* 多款人设 */
.hero-personas{margin-top:64px}
.hero-personas h3{text-align:center;font-size:22px;font-weight:800;color:var(--deep);margin-bottom:26px}
.persona-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:18px}
.persona-card{padding:14px 10px 16px;text-align:center}
.persona-card img{width:100%;aspect-ratio:1;object-fit:cover;border-radius:14px;margin-bottom:10px}
.persona-card p{font-size:14px;font-weight:600;color:var(--text)}
.persona-card .badge{display:inline-block;margin-top:6px;padding:2px 10px;background:var(--grad);color:#fff;font-size:11px;font-weight:600;border-radius:999px}

/* 3 三步上手 */
.steps{padding:88px 0;background:var(--bg)}
.step-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.step-card{padding:38px 30px;text-align:center}
.step-num{width:58px;height:58px;margin:0 auto 20px;border-radius:50%;background:var(--grad);color:#fff;font-size:20px;font-weight:800;display:flex;align-items:center;justify-content:center;box-shadow:0 10px 22px rgba(240,61,116,.28)}
.step-card h3{font-size:19px;color:var(--deep);font-weight:700}
.step-card p{margin-top:10px;font-size:14.5px;color:var(--muted);line-height:1.75}

/* 4 产品介绍 */
.intro{padding:88px 0;background:var(--bg-soft)}
.intro-grid{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}
.intro-img{border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden;height:auto}
.intro h2{font-size:32px;color:var(--deep);font-weight:800;line-height:1.3}
.intro .lead{margin:16px 0 22px;font-size:15px;color:var(--muted);line-height:1.85}
.check-item{display:flex;align-items:flex-start;gap:14px;padding:15px 0;border-bottom:1px dashed var(--border)}
.check-item:last-child{border-bottom:0}
.check-ic{flex-shrink:0;width:26px;height:26px;border-radius:50%;background:var(--grad);display:flex;align-items:center;justify-content:center;margin-top:2px}
.check-ic::before{content:"✓";font-size:14px;font-weight:700;color:#fff;line-height:1}
.check-item b{display:block;font-size:15.5px;color:var(--deep)}
.check-item span{font-size:14px;color:var(--muted);line-height:1.7}

/* 5 核心功能 */
.features{padding:88px 0;background:var(--bg)}
.feature-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.feature-card{padding:32px 26px}
.feature-ic{width:52px;height:52px;border-radius:14px;background:var(--primary-soft);display:flex;align-items:center;justify-content:center;margin-bottom:18px}
.feature-ic svg{width:26px;height:26px;stroke:var(--primary-deep)}
.feature-card h3{font-size:19px;color:var(--deep);font-weight:700}
.pain{display:inline-block;margin:10px 0 8px;padding:4px 12px;background:var(--bg-soft);border:1px solid var(--border);color:var(--primary-deep);font-size:13px;font-weight:600;border-radius:999px}
.feature-card .desc{font-size:14px;color:var(--muted);line-height:1.75}

/* 6 优势对比 */
.compare{padding:88px 0;background:var(--bg-soft)}
.table-box{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);background:#fff;border:1px solid var(--border)}
.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch}
.compare-tab{width:100%;min-width:640px;border-collapse:collapse;table-layout:fixed}
.compare-tab col.dim{width:21%}
.compare-tab col.feat{width:30%}
.compare-tab col.rest{width:25%}
.compare-tab thead th{padding:17px 12px;background:var(--deep);color:#fff;font-size:15px;font-weight:700}
.compare-tab thead th.feat{background:var(--grad)}
.compare-tab tbody td{padding:15px 12px;font-size:14px;text-align:center;border-top:1px solid var(--border);color:var(--muted);vertical-align:middle}
.compare-tab tbody td:first-child{text-align:left;font-weight:600;color:var(--deep);background:var(--bg)}
.compare-tab tbody td.feat{background:#FFF6F9;color:var(--primary-deep);font-weight:600}
.table-hint{display:none;text-align:center;font-size:13px;color:var(--muted);margin-top:12px}

/* 7 使用场景 */
.scenarios{padding:88px 0;background:var(--bg)}
.scene-list{display:flex;flex-wrap:wrap;justify-content:center;gap:14px}
.scene-chip{display:inline-flex;align-items:center;gap:8px;padding:12px 22px;background:var(--card);border:1px solid var(--border);border-radius:999px;font-size:14.5px;color:var(--text);box-shadow:var(--shadow);transition:transform .25s,box-shadow .25s}
.scene-chip:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover)}
.scene-chip::before{content:"✓";font-size:13px;font-weight:700;color:var(--primary-deep);line-height:1}
.vs-title{text-align:center;margin:56px 0 26px;font-size:24px;font-weight:800;color:var(--deep)}
.vs-title em{font-style:normal;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;padding:0 6px}
.vs-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.vs-card{padding:32px 30px}
.vs-card.alone{background:#FBF6FA;border-color:#E8DDE9}
.vs-card.together{background:linear-gradient(160deg,#FFF0F6,#FFE4EE);border-color:var(--primary-soft)}
.vs-card h3{display:flex;align-items:center;gap:10px;font-size:18px;font-weight:700;color:var(--deep);margin-bottom:18px}
.vs-card h3 .tag{width:30px;height:30px;border-radius:50%;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.vs-card.alone h3 .tag{background:#E9E0EB;color:#8E7B93}
.vs-card.together h3 .tag{background:var(--grad);color:#fff}
.vs-card h3 .tag::before{content:"✓";font-size:14px;font-weight:700;line-height:1}
.vs-card.alone h3 .tag::before{content:"✕";color:#8E7B93}
.vs-card.together h3 .tag::before{content:"✓";color:#fff}
.vs-card ul li{display:flex;gap:10px;align-items:flex-start;padding:9px 0;font-size:14.5px;color:var(--text);line-height:1.65}
.vs-card ul li::before{content:"✓";font-size:15px;font-weight:700;line-height:1;flex-shrink:0;margin-top:1px}
.vs-card.alone ul li::before{content:"✕";color:#B9A8BD}
.vs-card.together ul li::before{content:"✓";color:var(--primary-deep)}

/* 8 数据 */
.data{padding:88px 0;background:linear-gradient(150deg,#241636,#2A1A3D)}
.data .sec-head h2{color:#fff}
.data .sec-head p{color:rgba(255,255,255,.65)}
.data-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.data-card{text-align:center;padding:40px 16px;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);border-radius:var(--radius);transition:transform .25s}
.data-card:hover{transform:translateY(-6px)}
.data-num{font-size:46px;font-weight:800;line-height:1.1;background:linear-gradient(90deg,#FFB3C9,#FF5C8A);-webkit-background-clip:text;background-clip:text;color:transparent}
.data-label{margin-top:10px;color:rgba(255,255,255,.72);font-size:14.5px}

/* 9 人设定制 */
.persona-sec{padding:88px 0;background:var(--bg-soft)}
.persona-grid2{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}
.persona-img{border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden;height:auto}
.persona-sec h2{font-size:32px;color:var(--deep);font-weight:800;line-height:1.35}
.persona-sec .lead{margin:16px 0 22px;font-size:15px;color:var(--muted);line-height:1.85}
.persona-tags{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:28px}
.persona-tags span{padding:7px 18px;background:var(--card);border:1px solid var(--border);border-radius:999px;font-size:13.5px;color:var(--text);font-weight:600}

/* 10 用户评价 */
.reviews{padding:88px 0;background:var(--bg)}
.review-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.review-card{padding:26px 24px}
.review-top{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.review-ava{width:44px;height:44px;border-radius:50%;background:var(--primary-soft);color:var(--primary-deep);font-size:18px;font-weight:700;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.review-name{font-size:15px;font-weight:600;color:var(--deep)}
.stars{color:var(--gold);font-size:12px;letter-spacing:2px;margin-top:3px}
.review-text{font-size:14px;color:var(--muted);line-height:1.75}

/* 11 隐私安全 */
.privacy{padding:88px 0;background:var(--bg-soft)}
.privacy-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.privacy-card{padding:32px 26px}
.privacy-ic{width:52px;height:52px;border-radius:14px;background:var(--primary-soft);display:flex;align-items:center;justify-content:center;margin-bottom:18px}
.privacy-ic svg{width:26px;height:26px;stroke:var(--primary-deep)}
.privacy-card h3{font-size:17.5px;color:var(--deep);font-weight:700}
.privacy-card p{margin-top:10px;font-size:14px;color:var(--muted);line-height:1.75}

/* 12 版本更新 */
.update{padding:88px 0;background:var(--bg)}
.update-box{max-width:760px;margin:0 auto;padding:42px 46px}
.update-top{display:flex;align-items:center;flex-wrap:wrap;gap:14px;margin-bottom:6px}
.version-badge{font-size:24px;font-weight:800;color:#fff;background:var(--grad);padding:8px 24px;border-radius:999px;box-shadow:0 10px 22px rgba(240,61,116,.28)}
.update-date{font-size:14px;color:var(--muted)}
.update-list{margin-top:20px}
.update-list li{display:flex;gap:12px;padding:12px 0;border-bottom:1px dashed var(--border);font-size:14.5px;color:var(--text);line-height:1.7}
.update-list li:last-child{border-bottom:0}
.update-list li::before{content:"";flex-shrink:0;width:8px;height:8px;border-radius:50%;background:var(--grad);margin-top:8px}

/* 13 FAQ */
.faq{padding:88px 0;background:var(--bg-soft)}
.faq-list{max-width:820px;margin:0 auto;display:flex;flex-direction:column;gap:14px}
.faq-item{overflow:hidden}
.faq-q{width:100%;display:flex;justify-content:space-between;align-items:center;gap:16px;padding:20px 26px;background:none;border:0;cursor:pointer;font-size:16px;font-weight:600;color:var(--deep);text-align:left;min-height:60px}
.faq-q:hover{color:var(--primary-deep)}
.faq-q .arrow{flex-shrink:0;width:26px;height:26px;border-radius:50%;background:var(--primary-soft);display:flex;align-items:center;justify-content:center;color:var(--primary-deep);transition:transform .3s}
.faq-q .arrow::before{content:"+";font-size:16px;font-weight:600;line-height:1}
.faq-item.open .faq-q .arrow{transform:rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .35s ease}
.faq-a p{padding:0 26px 24px;font-size:14.5px;color:var(--muted);line-height:1.85}

/* 14 下载区 */
.download{padding:88px 0;background:linear-gradient(160deg,#FFE4EE,#FFF0F6)}
.download-box{max-width:700px;margin:0 auto;text-align:center}
.download h1{font-size:40px;font-weight:800;color:var(--deep);line-height:1.3}
.meta-line{margin:16px 0 34px;font-size:14px;color:var(--muted)}
.meta-line b{color:var(--text);font-weight:600}
.dl-group{display:flex;gap:16px;justify-content:center}
.btn-dl{display:inline-flex;align-items:center;justify-content:center;gap:10px;padding:16px 34px;font-size:16.5px;min-height:52px}
.btn-dl svg{width:20px;height:20px;stroke:#fff;fill:none}
.dl-tip{margin-top:24px;font-size:14px;color:var(--muted)}

/* 15 页脚 */
.footer{background:var(--deep);padding:36px 0}
.footer p{text-align:center;color:rgba(255,255,255,.65);font-size:14px}
.footer a{color:#FFB3C9}
.footer a:hover{color:#fff}

/* 16 返回顶部 */
.backtop{position:fixed;right:26px;bottom:30px;width:46px;height:46px;border-radius:50%;background:var(--grad);color:#fff;border:0;font-size:20px;cursor:pointer;opacity:0;visibility:hidden;transform:translateY(12px);transition:opacity .3s,transform .3s,visibility .3s;box-shadow:0 10px 24px rgba(240,61,116,.32);z-index:99}
.backtop.show{opacity:1;visibility:visible;transform:none}
.backtop:hover{transform:translateY(-3px)}

/* 响应式 */
@media (max-width:1100px){
  .persona-grid{grid-template-columns:repeat(3,1fr)}
  .feature-grid,.privacy-grid,.data-grid{grid-template-columns:repeat(2,1fr)}
  .review-grid{grid-template-columns:repeat(2,1fr)}
  .hero h1{font-size:44px}
}
@media (max-width:900px){
  .nav-menu{display:none}
  .hero{padding:120px 0 64px}
  .hero-grid{grid-template-columns:1fr;gap:44px}
  .hero-desc{margin-left:auto;margin-right:auto}
  .hero-left{text-align:center}
  .intro-grid,.persona-grid2{grid-template-columns:1fr;gap:40px}
  .vs-grid{grid-template-columns:1fr}
  .sec-head h2{font-size:30px}
}
@media (max-width:768px){
  .wrap{padding:0 20px}
  .nav-inner{padding:0 20px}
  .table-hint{display:block}
  .dl-group{flex-direction:column}
  .btn-dl{width:100%}
  .meta-line{font-size:12.5px;white-space:nowrap}
  .logo{min-height:44px}
  .btn-sm{min-height:44px}
  .update-box{padding:32px 24px}
  .vs-card{padding:26px 22px}
}
@media (max-width:640px){
  .feature-grid,.review-grid,.privacy-grid{grid-template-columns:1fr}
  .chat-body{height:286px}
  .hero h1{font-size:32px}
  .sec-head h2{font-size:26px}
  .download h1{font-size:27px}
  .data-num{font-size:38px}
  .step-grid{grid-template-columns:1fr}
  .vs-title{font-size:20px}
  .version-badge{font-size:20px}
  .backtop{right:16px;bottom:20px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .card,.btn,.chat-input button,.scene-chip,.backtop{transition:none}
}