:root{
  --bg:#fbfaff; --ink:#1b1730; --violet:#6a4cff; --pink:#ff8fb1;
  --muted:#5f5a76; --dim:#928da8; --line:#e6e2f2;
}
*{box-sizing:border-box}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:"Nunito",system-ui,sans-serif;font-size:16px;line-height:1.9;
}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}
.wrap{width:min(1080px,calc(100% - 48px));margin:0 auto}

/* 顶部对称 */
header{padding:18px 0}
header .wrap{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:16px}
header .left{display:flex;gap:18px;font-size:12.5px;color:var(--muted)}
header .brand{display:flex;align-items:center;gap:8px;font-weight:800;font-size:17px;letter-spacing:.02em;justify-self:center}
header .brand img{width:26px;height:26px;border-radius:8px}
header .right{display:flex;justify-content:flex-end}
.btn{background:var(--violet);color:#fff;font-weight:800;font-size:12.5px;padding:10px 20px;border-radius:999px}
.btn.soft{background:#fff;color:var(--violet);border:1px solid var(--line)}

/* 首屏 */
.hero{padding:34px 0 10px;text-align:center}
.kick{display:inline-block;font-size:10px;letter-spacing:.24em;color:var(--violet);background:#f0ecff;border-radius:999px;padding:5px 14px;margin:0 0 16px}
h1{font-size:clamp(30px,4vw,46px);line-height:1.4;margin:0 auto 14px;max-width:760px;font-weight:800;letter-spacing:-.01em}
.lead{color:var(--muted);font-size:14.4px;max-width:600px;margin:0 auto 20px}
.banner{margin:28px 0 0;border-radius:24px;overflow:hidden;border:1px solid var(--line);background:#fff;box-shadow:0 18px 40px rgba(80,60,160,.10)}
.banner img{width:100%}

/* 伙伴 */
.strip{padding:16px 0 4px}
.strip .wrap{display:flex;align-items:center;justify-content:center;gap:34px;flex-wrap:wrap}
.strip .lb{font-size:9px;letter-spacing:.26em;color:var(--dim)}
.strip img{height:36px;width:auto;object-fit:contain}

/* 段落 */
section{padding:34px 0 8px}
.head{text-align:center;margin-bottom:20px}
.head .n{font-size:10px;letter-spacing:.2em;color:var(--violet)}
.head h2{font-size:23px;margin:6px 0 4px;font-weight:800}
.head p{color:var(--dim);font-size:12.5px;margin:0}
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.steps div{background:#fff;border:1px solid var(--line);border-radius:20px;padding:18px;text-align:center}
.steps i{display:inline-flex;width:34px;height:34px;border-radius:50%;background:#f0ecff;color:var(--violet);align-items:center;justify-content:center;font-style:normal;font-weight:800;font-size:12px}
.steps b{display:block;font-size:15.5px;margin:8px 0 4px}
.steps p{margin:0;color:var(--muted);font-size:12.8px}

/* 功能气泡 */
.bubbles{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.bub{background:#fff;border:1px solid var(--line);border-radius:18px;padding:16px 18px;position:relative}
.bub b{display:block;font-size:14.6px;margin-bottom:4px}
.bub p{margin:0;color:var(--muted);font-size:12.9px}
.bub:nth-child(2n){border-bottom-right-radius:6px}
.bub:nth-child(2n+1){border-bottom-left-radius:6px}

/* 对话示例 */
.chat{max-width:620px;margin:0 auto;display:grid;gap:10px}
.chat div{max-width:80%;padding:11px 16px;border-radius:18px;font-size:13.6px}
.chat .l{background:#fff;border:1px solid var(--line);border-bottom-left-radius:6px}
.chat .r{background:var(--violet);color:#fff;margin-left:auto;border-bottom-right-radius:6px}
.chat small{display:block;font-size:9.5px;letter-spacing:.14em;opacity:.65;margin-bottom:3px}

/* 安全卡 */
.safety{background:#fff;border:1px solid var(--line);border-radius:22px;padding:24px 26px;max-width:760px;margin:0 auto;color:var(--muted);font-size:13.6px}
.safety b{display:block;color:var(--ink);font-size:15.5px;margin-bottom:6px}

/* 子页 */
.pagehead{padding:36px 0 20px;text-align:center}
.pagehead .lb{font-size:10px;letter-spacing:.24em;color:var(--violet);margin:0 0 10px}
.pagehead h1{font-size:clamp(30px,3.8vw,42px);margin:0 0 10px}
.pagehead p{color:var(--muted);font-size:13.6px;max-width:600px;margin:0 auto}
.cards{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:18px}
.card i{font-style:normal;font-size:10px;letter-spacing:.16em;color:var(--violet)}
.card b{display:block;font-size:15.5px;margin:5px 0 4px}
.card p{margin:0;color:var(--muted);font-size:12.9px}
ol.flow{counter-reset:f;list-style:none;padding:0;margin:0;display:grid;gap:10px}
ol.flow li{counter-increment:f;background:#fff;border:1px solid var(--line);border-radius:16px;padding:16px 18px;display:grid;grid-template-columns:38px 1fr;gap:12px}
ol.flow li:before{content:counter(f);font-weight:800;color:var(--violet);font-size:20px;line-height:1.1}
ol.flow b{display:block;font-size:15px;margin-bottom:2px}
ol.flow p{margin:0;color:var(--muted);font-size:13px}
details{background:#fff;border:1px solid var(--line);border-radius:14px;padding:13px 17px;margin-bottom:8px}
summary{cursor:pointer;list-style:none;font-size:14.4px;font-weight:700;display:flex;justify-content:space-between;gap:12px}
summary:after{content:"+";color:var(--violet)}
details[open] summary:after{content:"-"}
details p{margin:8px 0 0;color:var(--muted);font-size:13.2px}
.prose{max-width:720px;margin:0 auto}
.prose h2{font-size:20px;margin:26px 0 6px}
.prose p{color:var(--muted);font-size:13.8px;margin:0 0 12px}

footer{margin-top:44px;background:#fff;border-top:1px solid var(--line);padding:24px 0 30px}
footer .wrap{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;color:var(--dim);font-size:11.5px}
footer b{color:var(--ink);font-size:15px}

@media(max-width:900px){
  .wrap{width:calc(100% - 34px)}
  header .wrap{grid-template-columns:1fr auto}
  header .left{display:none}
  header .right{justify-self:end}
  .steps,.bubbles,.cards{grid-template-columns:1fr}
}