:root{
  --bg:#f5f5f7;--paper:#fff;--ink:#1d1d1f;--muted:#6e6e73;--faint:#86868b;
  --line:rgba(0,0,0,.08);--blue:#0071e3;--blue-d:#0062c4;--soft:#eef4fd;
  --sun:#ffc23a;--sun-soft:#fff6e0;--navy:#1f2f55;--ok:#248a3d;--bad:#d70015;
  --r:22px;--r-s:14px;
  --shadow:0 0 0 .5px rgba(0,0,0,.04),0 2px 8px rgba(0,0,0,.04),0 16px 40px rgba(0,0,0,.06);
  --font:-apple-system,BlinkMacSystemFont,"SF Pro Display","PingFang SC","Helvetica Neue","Microsoft YaHei","Noto Sans SC",sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font);background:var(--bg);color:var(--ink);line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.wrap{max-width:1120px;margin:0 auto;padding:0 24px}

/* 顶部 */
header{position:sticky;top:0;z-index:20;background:rgba(251,251,253,.8);backdrop-filter:saturate(180%) blur(20px);-webkit-backdrop-filter:saturate(180%) blur(20px);border-bottom:1px solid var(--line)}
header .wrap{display:flex;align-items:center;height:60px;gap:28px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:17px}
.brand img{width:34px;height:34px;border-radius:50%}
header nav{display:flex;gap:24px;font-size:14px;color:var(--muted);margin-left:auto}
header nav a:hover{color:var(--ink)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;height:44px;padding:0 22px;border-radius:999px;font-size:15px;font-weight:600;border:0;cursor:pointer;transition:background .15s,transform .15s}
.btn.main{background:var(--blue);color:#fff}
.btn.main:hover{background:var(--blue-d)}
.btn.sub{background:rgba(0,113,227,.09);color:var(--blue)}
.btn.sub:hover{background:rgba(0,113,227,.15)}
.btn.sm{height:36px;padding:0 16px;font-size:14px}
.btn:focus-visible{outline:3px solid rgba(0,113,227,.4);outline-offset:2px}

/* 首屏 */
.hero{padding:72px 0 40px}
.hero .wrap{display:grid;grid-template-columns:1.15fr .85fr;gap:40px;align-items:center}
.tag{display:inline-block;background:var(--sun-soft);color:#7a5300;font-size:13px;font-weight:600;padding:5px 12px;border-radius:999px;margin-bottom:18px}
h1{font-size:56px;line-height:1.12;letter-spacing:-.02em;font-weight:800;text-wrap:balance}
h1 em{font-style:normal;color:var(--blue)}
.lead{font-size:20px;color:var(--muted);margin:20px 0 32px;max-width:34em;text-wrap:pretty}
.cta{display:flex;gap:12px;flex-wrap:wrap}
.note{font-size:13px;color:var(--faint);margin-top:14px}
.hero-art{position:relative;justify-self:center;display:flex;flex-direction:column;align-items:center;gap:14px}
.hero-art .bubble{align-self:flex-start;background:#fff;box-shadow:var(--shadow);border-radius:18px 18px 18px 4px;padding:12px 16px;font-size:15px;max-width:230px}
.hero-art .bubble b{color:var(--blue)}
.hero-art img{width:300px;filter:drop-shadow(0 24px 40px rgba(31,47,85,.18))}

/* 区块 */
section{padding:88px 0}
.kicker{color:var(--blue);font-weight:700;font-size:14px;letter-spacing:.04em;margin-bottom:10px}
h2{font-size:40px;line-height:1.2;letter-spacing:-.015em;font-weight:800;text-wrap:balance}
.sub-lead{font-size:18px;color:var(--muted);margin-top:14px;max-width:40em}

/* 痛点 */
.pains{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:40px}
.pain{background:var(--paper);border-radius:var(--r);padding:26px;box-shadow:var(--shadow)}
.pain .q{font-size:19px;font-weight:700;margin-bottom:8px}
.pain p{color:var(--muted);font-size:15px}

/* 流程 */
.flow{display:grid;grid-template-columns:repeat(4,1fr);gap:0;margin-top:48px;counter-reset:s;position:relative}
.step{padding:0 20px 0 0;position:relative}
.step .n{display:flex;align-items:center;justify-content:center;width:40px;height:40px;border-radius:50%;background:var(--navy);color:#fff;font-weight:700;margin-bottom:16px;position:relative;z-index:1}
.step:not(:last-child)::after{content:"";position:absolute;top:20px;left:44px;right:4px;height:2px;background:repeating-linear-gradient(90deg,#c7cfdf 0 6px,transparent 6px 12px)}
.step h3{font-size:19px;margin-bottom:6px}
.step p{color:var(--muted);font-size:15px}

/* 产品图 */
.shot{margin-top:44px;border-radius:var(--r);overflow:hidden;box-shadow:0 0 0 1px rgba(0,0,0,.06),0 30px 80px rgba(31,47,85,.16);background:#fff}
.shot .bar{display:flex;gap:7px;padding:12px 16px;background:#ececf0;border-bottom:1px solid var(--line)}
.shot .bar i{width:11px;height:11px;border-radius:50%;background:#ff5f57}
.shot .bar i:nth-child(2){background:#febc2e}.shot .bar i:nth-child(3){background:#28c840}
.shot img{width:100%}

/* 功能：左右交替 */
.feat{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center;padding:56px 0;border-top:1px solid var(--line)}
.feat:first-of-type{border-top:0}
.feat.rev .txt{order:2}
.feat h3{font-size:30px;line-height:1.25;letter-spacing:-.01em;margin-bottom:14px;text-wrap:balance}
.feat .txt>p{color:var(--muted);font-size:17px}
.feat ul{list-style:none;margin-top:18px;display:grid;gap:10px}
.feat li{padding-left:28px;position:relative;font-size:15px}
.feat li::before{content:"";position:absolute;left:0;top:5px;width:16px;height:16px;border-radius:50%;background:var(--soft) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M4.5 8.2l2.3 2.3 4.7-4.9' fill='none' stroke='%230071e3' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/16px no-repeat}
.card{background:var(--paper);border-radius:var(--r);box-shadow:var(--shadow);padding:24px;position:relative}
.card .ip{position:absolute;right:-10px;bottom:-14px;width:96px}

/* 模拟界面元素（不用真实账号数据） */
.mock-title{font-size:13px;color:var(--faint);margin-bottom:6px}
.score{display:flex;align-items:baseline;gap:8px}
.score b{font-size:48px;font-weight:800;letter-spacing:-.02em}
.score span{color:var(--muted)}
.dims{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:16px}
.dim{background:var(--bg);border-radius:var(--r-s);padding:12px}
.dim .k{font-size:13px;color:var(--muted)}
.dim .v{font-size:22px;font-weight:700}
.dim .bar2{height:5px;border-radius:3px;background:#e3e3e8;margin-top:6px;overflow:hidden}
.dim .bar2 i{display:block;height:100%;background:var(--blue);border-radius:3px}
.dim.bad .v{color:var(--bad)}.dim.bad .bar2 i{background:var(--bad)}
.say{display:grid;gap:10px}
.say .row{border-radius:var(--r-s);padding:12px 14px;font-size:14px}
.say .old{background:#fff1f0;color:#7a1d16}
.say .new{background:#eef8f1;color:#17532a}
.say .row b{display:block;font-size:12px;opacity:.75;margin-bottom:2px}
.chat{display:grid;gap:12px}
.msg{max-width:88%;padding:12px 15px;border-radius:18px;font-size:14px}
.msg.me{justify-self:end;background:var(--blue);color:#fff;border-bottom-right-radius:5px}
.msg.ai{background:var(--bg);border-bottom-left-radius:5px}
.msg.ai ol{padding-left:18px;margin-top:6px}
.funnel{display:grid;gap:8px}
.funnel .f{display:grid;grid-template-columns:96px 1fr 60px;align-items:center;gap:10px;font-size:14px}
.funnel .f .t{height:22px;border-radius:6px;background:var(--soft);position:relative;overflow:hidden}
.funnel .f .t i{position:absolute;inset:0 auto 0 0;background:#9cc3f2;border-radius:6px}
.funnel .f.weak .t i{background:#ff8a80}
.funnel .f.weak{font-weight:700;color:var(--bad)}
.live{display:flex;align-items:center;gap:10px;font-size:14px;margin-bottom:12px}
.dot{width:9px;height:9px;border-radius:50%;background:#ff3b30;box-shadow:0 0 0 4px rgba(255,59,48,.15)}
.rooms{display:grid;gap:8px}
.room{display:flex;justify-content:space-between;background:var(--bg);border-radius:var(--r-s);padding:11px 14px;font-size:14px}
.room em{font-style:normal;color:var(--muted)}

/* 安心 */
.trust{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:40px}
.trust .t{background:var(--paper);border-radius:var(--r);padding:26px;box-shadow:var(--shadow)}
.trust h3{font-size:18px;margin-bottom:6px}
.trust p{color:var(--muted);font-size:15px}

/* 价格（待定） */
.price{margin-top:40px;background:var(--navy);color:#fff;border-radius:28px;padding:48px;display:grid;grid-template-columns:1.3fr 1fr;gap:32px;align-items:center;position:relative;overflow:hidden}
.price h2{color:#fff}
.price p{color:rgba(255,255,255,.75);margin-top:12px;font-size:17px}
.price ul{list-style:none;display:grid;gap:10px;font-size:15px}
.price li::before{content:"✓";color:var(--sun);font-weight:700;margin-right:10px}
.price .cta{margin-top:26px}
.price .btn.sub{background:transparent;color:#fff;box-shadow:inset 0 0 0 1.5px rgba(255,255,255,.55)}
.price .btn.sub:hover{background:rgba(255,255,255,.1)}
.price .btn.main{background:var(--sun);color:#2b1d00}
.price .btn.main:hover{background:#ffcf5c}

/* 常见问题 */
.faq{margin-top:32px;display:grid;grid-template-columns:1fr 1fr;gap:10px;align-items:start}
details{background:var(--paper);border-radius:var(--r-s);box-shadow:var(--shadow);padding:0 22px}
summary{cursor:pointer;list-style:none;padding:18px 0;font-weight:600;font-size:16px;display:flex;justify-content:space-between;gap:16px}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";color:var(--blue);font-size:22px;line-height:1}
details[open] summary::after{content:"−"}
details p{color:var(--muted);padding-bottom:18px;font-size:15px}

/* 底部 */
.end{text-align:left;padding:72px 0}
.end{padding-top:40px}.end .box{display:flex;align-items:center;gap:32px;background:var(--paper);border-radius:28px;padding:40px 48px;box-shadow:var(--shadow)}
.end img{width:120px}
.end h2{font-size:32px}
.end .cta{margin-top:18px}
footer{padding:28px 0 40px;color:var(--muted);font-size:13px;border-top:1px solid var(--line)}
footer .wrap{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}

@media (max-width:900px){
  header nav{display:none}
  .hero .wrap,.feat,.price{grid-template-columns:1fr}
  .feat.rev .txt{order:0}
  h1{font-size:40px}h2{font-size:30px}
  .hero-art .bubble{left:0}
  .pains,.trust,.faq{grid-template-columns:1fr}
  .flow{grid-template-columns:1fr 1fr;gap:28px}
  .step::after{display:none}
  .end .box{flex-direction:column;align-items:flex-start;padding:32px}
  section{padding:64px 0}
}
@media (max-width:520px){
  .flow{grid-template-columns:1fr}
  .dims{grid-template-columns:1fr 1fr}
  .price{padding:32px 24px}
  .hero-art img{width:220px}
}
@media (prefers-reduced-motion:no-preference){
  .reveal{opacity:0;transform:translateY(16px);transition:opacity .6s ease,transform .6s ease}
  .reveal.in{opacity:1;transform:none}
}