/* ================= saylo 官网落地页样式 ================= */
:root{
  --primary:#FF5C8A;
  --primary-deep:#E94E78;
  --accent:#8E7BFF;
  --grad:linear-gradient(135deg,#FF5C8A 0%,#9B7BFF 100%);
  --dark:#2B2433;
  --text:#4B4357;
  --muted:#948A9F;
  --border:#F2E3EE;
  --bg:#FFF9FC;
  --bg-soft:#FFF0F6;
  --card:#FFFFFF;
  --radius:16px;
  --shadow:0 10px 30px rgba(255,92,138,.12);
  --shadow-hover:0 18px 44px rgba(255,92,138,.20);
  --nav-h:68px;
  --wrap:1200px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  background:var(--bg);color:var(--text);
  line-height:1.75;font-size:15px;-webkit-font-smoothing:antialiased;
}
img{display:block;max-width:100%}
a{text-decoration:none;color:inherit}
ul{list-style:none}
button{font-family:inherit;cursor:pointer;border:none;background:none}
section{scroll-margin-top:calc(var(--nav-h) + 12px)}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px}
.sec{padding:88px 0}
.sec-alt{background:var(--bg-soft)}
.sec-head{text-align:center;max-width:720px;margin:0 auto 48px}
.sec-head h2{font-size:32px;color:var(--dark);line-height:1.35;font-weight:800}
.sec-head p{color:var(--muted);margin-top:12px;font-size:16px}
.sec-head.left{text-align:left;margin:0 0 28px}
.sec-head.left h2{font-size:30px}
.card{
  background:var(--card);border:1px solid var(--border);border-radius:var(--radius);
  box-shadow:var(--shadow);transition:transform .3s ease,box-shadow .3s ease;
}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}
.ver{
  display:inline-block;background:var(--grad);color:#fff;font-size:.5em;vertical-align:middle;
  padding:3px 12px;border-radius:999px;margin-left:6px;letter-spacing:.5px;
}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  background:var(--grad);color:#fff;font-weight:700;font-size:16px;
  padding:14px 34px;border-radius:999px;box-shadow:0 10px 26px rgba(255,92,138,.35);
  transition:transform .25s ease,box-shadow .25s ease,filter .25s ease;
}
.btn:hover{transform:translateY(-3px);box-shadow:0 14px 34px rgba(255,92,138,.45);filter:brightness(1.05)}

/* ================= 顶部导航 ================= */
.nav{
  position:fixed;top:0;left:0;right:0;height:var(--nav-h);z-index:100;
  background:rgba(255,249,252,.92);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid var(--border);transition:box-shadow .3s ease;
}
.nav.scrolled{box-shadow:0 6px 24px rgba(255,92,138,.1)}
.nav-in{height:var(--nav-h);display:flex;align-items:center;justify-content:space-between;gap:24px}
.logo{
  font-size:26px;font-weight:800;color:var(--dark);letter-spacing:.5px;line-height:1;
  background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;
}
.menu{display:flex;align-items:center;gap:26px}
.menu a{font-size:14.5px;color:var(--text);font-weight:500;position:relative;transition:color .25s ease;white-space:nowrap}
.menu a::after{content:"";position:absolute;left:50%;bottom:-6px;width:0;height:2px;background:var(--grad);border-radius:2px;transform:translateX(-50%);transition:width .3s ease}
.menu a:hover,.menu a.active{color:var(--primary)}
.menu a:hover::after,.menu a.active::after{width:100%}
.nav-btn{padding:10px 22px;font-size:14px;box-shadow:none}
.nav-btn:hover{box-shadow:0 10px 22px rgba(255,92,138,.4)}

/* ================= 首屏 Hero ================= */
.hero{
  position:relative;padding:calc(var(--nav-h) + 64px) 0 70px;overflow:hidden;background:linear-gradient(180deg,#FFF1F6 0%,#FFF9FC 100%);
}
.hero-bg{position:absolute;inset:0;pointer-events:none;background:radial-gradient(circle at 18% 20%,rgba(255,92,138,.14),transparent 42%),radial-gradient(circle at 84% 30%,rgba(142,123,255,.16),transparent 45%);}
.hero-in{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
.hero-h1{font-size:46px;color:var(--dark);font-weight:900;line-height:1.2}
.hero-desc{color:var(--text);font-size:16.5px;margin:20px 0 28px;max-width:560px}
.hero-cta{display:flex;align-items:center;gap:18px;flex-wrap:wrap}
.hero-btn{font-size:17px;padding:16px 38px}
.hero-note{color:var(--muted);font-size:14px}
.hero-trust{display:flex;gap:22px;flex-wrap:wrap;margin-top:26px}
.hero-trust span{color:var(--text);font-size:13.5px;display:inline-flex;align-items:center;gap:6px}
.hero-trust span::before{content:"✔";color:var(--primary);font-weight:700}

/* 聊天窗口 */
.chat{
  max-width:400px;margin-left:auto;background:#251E32;border:1px solid rgba(255,255,255,.14);border-radius:22px;
  box-shadow:0 26px 60px rgba(43,36,51,.38);overflow:hidden;
}
.chat-head{display:flex;align-items:center;gap:12px;padding:14px 18px;background:linear-gradient(135deg,#3A2E5C,#5A3D6E);border-bottom:1px solid rgba(255,255,255,.12)}
.chat-avatar{width:44px;height:44px;border-radius:50%;object-fit:cover;border:2px solid rgba(255,255,255,.85);box-shadow:0 4px 12px rgba(0,0,0,.35)}
.chat-info{flex:1;line-height:1.35}
.chat-info strong{display:block;font-size:15px;color:#fff}
.chat-status{font-size:12px;color:#8EF0B0;display:flex;align-items:center;gap:5px}
.chat-status i{width:8px;height:8px;border-radius:50%;background:#3DDC84;display:inline-block;animation:pulse 1.6s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.35}}
.chat-tools{display:flex;gap:5px}
.chat-tools b{width:5px;height:5px;border-radius:50%;background:rgba(255,255,255,.55)}
.chat-body{padding:16px 14px 10px;background:linear-gradient(180deg,#2A2238,#251E32);min-height:360px}
.chat-date{text-align:center;font-size:11.5px;color:rgba(255,255,255,.5);margin-bottom:14px}
.msg{display:flex;align-items:flex-end;gap:8px;margin-bottom:14px}
.msg-ai{justify-content:flex-start}
.msg-me{justify-content:flex-end}
.msg-avatar{width:30px;height:30px;border-radius:50%;object-fit:cover;flex-shrink:0;border:1px solid rgba(255,255,255,.25)}
.bubble{
  max-width:76%;padding:10px 14px;font-size:14px;line-height:1.6;border-radius:14px;
}
.msg-ai .bubble{background:rgba(255,255,255,.14);color:#F4F0FA;border-bottom-left-radius:4px}
.msg-me .bubble{background:var(--grad);color:#fff;border-bottom-right-radius:4px}
.msg-tag{font-size:10.5px;color:rgba(255,255,255,.5);flex-shrink:0}
.chat-input{display:flex;align-items:center;gap:10px;padding:12px 14px;border-top:1px solid rgba(255,255,255,.1);background:#211A2C}
.ci-plus{width:26px;height:26px;border-radius:8px;background:rgba(255,255,255,.12);color:#FF9DB8;display:flex;align-items:center;justify-content:center;font-size:16px;font-weight:700}
.chat-input input{flex:1;border:none;background:rgba(255,255,255,.12);border-radius:999px;padding:9px 16px;font-size:13.5px;color:#fff;outline:none;transition:box-shadow .25s}
.chat-input input::placeholder{color:rgba(255,255,255,.45)}
.chat-input input:focus{box-shadow:0 0 0 2px rgba(255,92,138,.65)}
.chat-input button{background:var(--grad);color:#fff;font-size:13px;padding:9px 18px;border-radius:999px;font-weight:600}

/* 人设条 */
.persona-strip{margin-top:64px}
.persona-tit{text-align:center;font-size:22px;color:var(--dark);font-weight:800;margin-bottom:28px}
.persona-list{display:grid;grid-template-columns:repeat(6,1fr);gap:20px}
.persona{text-align:center;transition:transform .3s ease}
.persona img{width:100%;aspect-ratio:3/4;object-fit:cover;border-radius:16px;border:3px solid #fff;box-shadow:0 10px 24px rgba(255,92,138,.18);transition:transform .3s ease,box-shadow .3s ease}
.persona:hover{transform:translateY(-8px)}
.persona:hover img{box-shadow:0 16px 36px rgba(255,92,138,.3)}
.persona span{display:block;margin-top:12px;font-size:15px;font-weight:700;color:var(--dark)}
.persona-custom span{color:var(--accent)}

/* ================= 三步上手 ================= */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.step{padding:36px 30px}
.step-num{
  font-size:54px;font-weight:900;line-height:1;
  background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;opacity:.85;
}
.step h3{font-size:20px;color:var(--dark);margin:14px 0 10px;font-weight:800}
.step p{color:var(--muted);font-size:14.5px}

/* ================= 产品介绍 ================= */
.intro-in{display:grid;grid-template-columns:.9fr 1.1fr;gap:60px;align-items:center}
.intro-visual{position:relative}
.intro-visual img{border-radius:22px;box-shadow:0 24px 60px rgba(255,92,138,.2)}
.intro-badge{
  position:absolute;left:-18px;bottom:34px;background:#fff;border:1px solid var(--border);
  padding:10px 18px;border-radius:999px;font-size:14px;font-weight:700;color:var(--primary);box-shadow:var(--shadow);
}
.intro-points{margin-top:6px}
.intro-points li{
  position:relative;padding:13px 0 13px 30px;border-bottom:1px dashed var(--border);
  color:var(--muted);font-size:14.5px;
}
.intro-points li:last-child{border-bottom:none}
.intro-points li::before{content:"";position:absolute;left:4px;top:19px;width:9px;height:9px;border-radius:3px;background:var(--grad)}
.intro-points b{display:block;color:var(--dark);font-size:16.5px;font-weight:800;margin-bottom:2px}

/* ================= 核心功能 ================= */
.feat-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:28px}
.feat{padding:34px 30px}
.feat-icon{
  width:58px;height:58px;border-radius:16px;display:flex;align-items:center;justify-content:center;
  font-size:28px;background:var(--bg-soft);border:1px solid var(--border);margin-bottom:18px;
}
.feat h3{font-size:21px;color:var(--dark);font-weight:800;margin-bottom:10px}
.feat>p{color:var(--text);font-size:14.5px}
.feat-solve{
  display:block;margin-top:16px;padding:13px 16px;background:var(--bg-soft);border-radius:12px;
  font-size:13.5px;color:var(--text);
}
.feat-solve b{color:var(--primary-deep)}

/* ================= 优势对比 ================= */
.cmp{overflow:hidden}
.cmp-row{display:grid;grid-template-columns:1fr 1.3fr 1.3fr;align-items:center;padding:17px 26px;font-size:14.5px;border-bottom:1px solid var(--border)}
.cmp-row:last-child{border-bottom:none}
.cmp-head{background:linear-gradient(135deg,#FFE9F1,#F1ECFF);font-weight:800;color:var(--dark);font-size:15px}
.cmp-dim{color:var(--dark);font-weight:700}
.cmp-good{color:var(--primary-deep);font-weight:600}

/* ================= 使用场景 ================= */
.scene-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;max-width:900px;margin:0 auto}
.scene{display:flex;align-items:center;gap:16px;background:var(--card);border:1px solid var(--border);border-radius:14px;padding:20px 24px;transition:transform .3s ease,box-shadow .3s ease}
.scene:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.sc-ic{width:46px;height:46px;flex-shrink:0;border-radius:12px;background:var(--bg-soft);display:flex;align-items:center;justify-content:center;font-size:22px}
.scene p{color:var(--text);font-size:15px}
.scene-vs{display:flex;align-items:center;justify-content:center;gap:22px;margin-top:44px;flex-wrap:wrap}
.scene-vs span{font-size:17px;font-weight:800;padding:12px 28px;border-radius:999px}
.vs-bad{background:#F3E7F4;color:#A08AA6}
.vs-good{background:var(--grad);color:#fff;box-shadow:0 12px 30px rgba(255,92,138,.35)}
.scene-vs i{color:var(--primary);font-style:normal;font-size:22px;font-weight:900}

/* ================= 数据模块 ================= */
.data-sec{background:linear-gradient(135deg,#2B2433 0%,#3A2F52 100%);}
.data-sec .sec-head h2{color:#fff}
.data-sec .sec-head p{color:rgba(255,255,255,.65)}
.data-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.data{
  text-align:center;padding:34px 20px;background:rgba(255,255,255,.07);
  border:1px solid rgba(255,255,255,.14);box-shadow:none;
}
.data:hover{background:rgba(255,255,255,.12);box-shadow:0 18px 40px rgba(0,0,0,.3)}
.data b{display:block;font-size:38px;font-weight:900;background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;line-height:1.2}
.data span{display:block;color:rgba(255,255,255,.75);font-size:14.5px;margin-top:8px}

/* ================= 人设定制 ================= */
.custom-in{display:grid;grid-template-columns:1.1fr .9fr;gap:60px;align-items:center}
.custom-visual{position:relative}
.custom-visual img{border-radius:22px;box-shadow:0 24px 60px rgba(255,92,138,.2)}

/* ================= 用户评价 ================= */
.rev-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.rev{padding:28px 26px}
.rev-top{display:flex;align-items:center;gap:14px;margin-bottom:14px}
.rev-avatar{
  width:48px;height:48px;border-radius:50%;flex-shrink:0;color:#fff;font-size:20px;font-weight:800;
  display:flex;align-items:center;justify-content:center;background:var(--grad);
}
.rev-meta b{display:block;color:var(--dark);font-size:15.5px}
.stars{color:#FFB84D;letter-spacing:2px;font-size:14px}
.rev-text{color:var(--text);font-size:14.5px}

/* ================= 隐私安全 ================= */
.privacy-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.privacy{padding:32px 26px;text-align:center}
.pr-ic{width:56px;height:56px;margin:0 auto 16px;border-radius:16px;background:var(--bg-soft);border:1px solid var(--border);display:flex;align-items:center;justify-content:center;font-size:26px}
.privacy h3{font-size:18px;color:var(--dark);font-weight:800;margin-bottom:8px}
.privacy p{color:var(--muted);font-size:13.8px}

/* ================= 版本更新 ================= */
.update{padding:36px 36px;max-width:820px;margin:0 auto}
.upd-head{display:flex;align-items:center;gap:16px;flex-wrap:wrap;margin-bottom:20px}
.upd-ver{background:var(--grad);color:#fff;font-size:20px;font-weight:800;padding:6px 20px;border-radius:999px}
.upd-time{color:var(--muted);font-size:14px}
.upd-list li{position:relative;padding:12px 0 12px 26px;color:var(--text);font-size:15px;border-bottom:1px dashed var(--border)}
.upd-list li:last-child{border-bottom:none}
.upd-list li::before{content:"";position:absolute;left:2px;top:20px;width:8px;height:8px;border-radius:50%;background:var(--primary)}

/* ================= FAQ ================= */
.faq{max-width:820px;margin:0 auto}
.faq-item{margin-bottom:16px;overflow:hidden}
.faq-item.open{box-shadow:var(--shadow-hover)}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:20px 26px;font-size:16.5px;font-weight:700;color:var(--dark);text-align:left;
}
.faq-arrow{
  width:30px;height:30px;flex-shrink:0;border-radius:50%;background:var(--bg-soft);color:var(--primary);
  display:flex;align-items:center;justify-content:center;font-size:20px;font-weight:700;transition:transform .3s ease,background .3s ease;
}
.faq-item.open .faq-arrow{transform:rotate(45deg);background:var(--grad);color:#fff}
.faq-a{max-height:0;overflow:hidden;transition:max-height .35s ease}
.faq-a-in{padding:0 26px 22px;color:var(--muted);font-size:14.5px}

/* ================= 下载区域 ================= */
.download{padding:96px 0;background:linear-gradient(180deg,#FFF0F6 0%,#FFF9FC 100%);}
.down-box{max-width:760px;margin:0 auto;text-align:center;padding:56px 40px}
.down-h1{font-size:40px;color:var(--dark);font-weight:900}
.down-meta{color:var(--muted);font-size:14px;margin:16px 0 32px;letter-spacing:.3px}
.down-btns{display:flex;justify-content:center;gap:22px;flex-wrap:wrap}
.down-btn{flex-direction:column;padding:16px 40px;line-height:1.3;gap:2px;min-width:220px}
.down-btn b{font-size:17px}
.down-btn span{font-size:13px;font-weight:500;opacity:.9}
.down-tip{color:var(--text);font-size:14.5px;margin-top:26px}

/* ================= 页脚 ================= */
.footer{background:#2B2433;color:rgba(255,255,255,.7);padding:36px 0;text-align:center}
.footer-link{
  font-size:22px;font-weight:800;color:#fff;background:var(--grad);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;
}
.footer-copy{font-size:13px;margin-top:8px;color:rgba(255,255,255,.5)}

/* ================= 返回顶部 ================= */
.back-top{
  position:fixed;right:26px;bottom:30px;z-index:99;width:48px;height:48px;border-radius:50%;
  background:var(--grad);color:#fff;font-size:22px;font-weight:700;display:flex;align-items:center;justify-content:center;
  box-shadow:0 10px 26px rgba(255,92,138,.4);opacity:0;visibility:hidden;transform:translateY(16px);
  transition:opacity .3s ease,transform .3s ease,visibility .3s ease;
}
.back-top.show{opacity:1;visibility:visible;transform:translateY(0)}

/* ================= 平板适配 ================= */
@media (max-width:1024px){
  .menu{gap:18px}
  .menu a{font-size:13.5px}
  .hero-in{grid-template-columns:1fr;gap:40px}
  .chat{margin:0 auto}
  .persona-list{grid-template-columns:repeat(3,1fr)}
  .feat-grid{grid-template-columns:1fr}
  .privacy-grid{grid-template-columns:repeat(2,1fr)}
  .rev-grid{grid-template-columns:repeat(2,1fr)}
  .intro-in,.custom-in{grid-template-columns:1fr;gap:40px}
  .intro-visual img,.custom-visual img{max-width:480px;margin:0 auto}
}

/* ================= 手机适配 ================= */
@media (max-width:640px){
  .wrap{padding:0 20px}
  .sec{padding:64px 0}
  .sec-head{margin-bottom:34px}
  .sec-head h2{font-size:24px}
  .sec-head.left h2{font-size:22px}
  .sec-head p{font-size:14.5px}
  /* 导航：仅显示下载按钮 */
  .menu{display:none}
  .nav-btn{padding:9px 18px;font-size:13.5px}
  .hero{padding:calc(var(--nav-h) + 40px) 0 50px}
  .hero-h1{font-size:30px}
  .hero-desc{font-size:15px;margin:16px 0 22px}
  .hero-cta{flex-direction:column;align-items:stretch}
  .hero-btn{width:100%;font-size:16px;padding:15px 20px}
  .hero-note{text-align:center;font-size:13px}
  .hero-trust{justify-content:flex-start;gap:14px}
  .hero-trust span{font-size:12.5px}
  .chat{max-width:100%;border-radius:18px}
  .chat-body{min-height:300px}
  .persona-strip{margin-top:44px}
  .persona-tit{font-size:19px}
  .persona-list{grid-template-columns:repeat(3,1fr);gap:14px}
  .persona span{font-size:13px;margin-top:8px}
  .steps{grid-template-columns:1fr;gap:20px}
  .step{padding:28px 24px}
  .step-num{font-size:42px}
  .feat{padding:28px 22px}
  .feat h3{font-size:19px}
  /* 产品介绍/人设定制：图片适配容器宽度，修复移动端溢出 */
  .intro-in,.custom-in{overflow:hidden}
  .intro-visual,.custom-visual{min-width:0}
  .intro-visual img,.custom-visual img{width:100%;max-width:100%;margin:0}
  .intro-badge{left:12px;bottom:16px;padding:7px 14px;font-size:12.5px}
  /* 优势对比：改纵向卡片，保留两列表头防止歧义 */
  .cmp-row{grid-template-columns:1fr 1fr;padding:14px 18px;font-size:13.5px}
  .cmp-row .cmp-dim{grid-column:1/-1;margin-bottom:6px}
  .cmp-head{display:grid;grid-template-columns:1fr 1fr;padding:12px 18px;font-size:13px}
  .cmp-head span:first-child{display:none}
  .cmp-good{font-size:13.5px}
  .scene-grid{grid-template-columns:1fr;gap:14px}
  .scene{padding:16px 18px}
  .scene p{font-size:14px}
  .scene-vs{gap:14px;margin-top:34px}
  .scene-vs span{font-size:14.5px;padding:10px 18px}
  .data-grid{grid-template-columns:repeat(2,1fr);gap:16px}
  .data b{font-size:30px}
  .data span{font-size:13px}
  .rev-grid{grid-template-columns:1fr;gap:18px}
  .rev{padding:24px 22px}
  .privacy-grid{grid-template-columns:1fr;gap:16px}
  .update{padding:26px 20px}
  .upd-ver{font-size:17px}
  .upd-list li{font-size:14px}
  .faq-q{padding:17px 20px;font-size:15.5px}
  .faq-a-in{padding:0 20px 18px;font-size:14px}
  .download{padding:64px 0}
  .down-box{padding:40px 22px}
  .down-h1{font-size:28px}
  .down-meta{font-size:12px;white-space:nowrap;margin:14px 0 26px}
  .down-btns{flex-direction:column;gap:16px}
  .down-btn{width:100%;min-width:0}
  .down-tip{font-size:13.5px;margin-top:22px}
  .back-top{right:16px;bottom:22px;width:44px;height:44px}
}