:root{
  --red:#F13C3B; --red-dark:#C91D34; --red-bright:#FF6250; --red-bg:#FFE7E3;
  --gold:#FFC45F; --gold-bg:#FFF6E1;
  --ink:#542D36; --ink-sub:#7A4A55; --ink-weak:#A8828C;
  --line:#F2E0DC; --bg:#FFF8F0; --card:#FFF;
  --r:16px; --shadow:0 8px 30px rgba(201,29,52,.08);
}
*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%}
body{
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  background:var(--bg);color:var(--ink);font-size:16px;line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img,svg{display:block;max-width:100%}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}

/* nav */
.nav{position:sticky;top:0;z-index:50;background:rgba(255,248,240,.86);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.nav-in{display:flex;align-items:center;height:64px;gap:12px}
.logo{display:flex;align-items:center;gap:9px;font-weight:800;font-size:18px;color:var(--red)}
.logo-mark{width:32px;height:32px;border-radius:10px;background:linear-gradient(135deg,var(--red-bright),var(--red-dark));display:grid;place-items:center;color:#fff;font-size:15px;font-weight:800}
.nav-links{display:flex;gap:26px;margin-left:auto;font-size:15px;color:var(--ink-sub)}
.nav-links a:hover{color:var(--red)}
.nav-cta{padding:8px 18px;border-radius:999px;background:var(--red);color:#fff;font-weight:700;font-size:14px}
.nav-cta:hover{background:var(--red-dark)}

/* hero */
.hero{padding:72px 0 40px;text-align:center}
.hero h1{font-size:44px;line-height:1.25;font-weight:800;letter-spacing:-.5px}
.hero h1 em{font-style:normal;color:var(--red)}
.hero p.sub{margin-top:16px;font-size:18px;color:var(--ink-sub);max-width:620px;margin-left:auto;margin-right:auto}
.cta-row{display:flex;gap:14px;justify-content:center;margin-top:32px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:8px;padding:15px 34px;border-radius:999px;font-weight:800;font-size:17px;transition:.18s}
.btn-primary{background:var(--red);color:#fff;box-shadow:0 8px 24px rgba(241,60,59,.28)}
.btn-primary:hover{background:var(--red-dark);transform:translateY(-2px)}
.btn-ghost{border:1.5px solid var(--red);color:var(--red);background:transparent}
.btn-ghost:hover{background:var(--red-bg)}
.hero-note{margin-top:14px;font-size:13px;color:var(--ink-weak)}

/* stats */
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;max-width:760px;margin:48px auto 0}
.stat{background:var(--card);border-radius:var(--r);padding:22px 16px;text-align:center;box-shadow:0 2px 8px rgba(201,29,52,.06)}
.stat b{display:block;font-size:34px;font-weight:800;color:var(--red);font-variant-numeric:tabular-nums;line-height:1.1}
.stat span{font-size:14px;color:var(--ink-weak)}

/* section */
.sec{padding:72px 0}
.sec-head{text-align:center;margin-bottom:44px}
.sec-head h2{font-size:32px;font-weight:800}
.sec-head p{margin-top:10px;color:var(--ink-sub);font-size:16px}

/* cards */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.card{background:var(--card);border-radius:var(--r);padding:28px 24px;box-shadow:0 2px 8px rgba(201,29,52,.06);border:1px solid #FDEFEC}
.card .ico{width:48px;height:48px;border-radius:14px;display:grid;place-items:center;font-size:20px;font-weight:800;margin-bottom:16px}
.ico-r{background:var(--red-bg);color:var(--red)}
.ico-g{background:var(--gold-bg);color:#B4771A}
.ico-o{background:#FCE7D2;color:#9A5A18}
.card h3{font-size:19px;font-weight:800;margin-bottom:8px}
.card p{font-size:15px;color:var(--ink-sub);line-height:1.7}

/* steps */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;counter-reset:s}
.step{background:var(--card);border-radius:var(--r);padding:24px 20px;position:relative;box-shadow:0 2px 8px rgba(201,29,52,.06)}
.step:before{counter-increment:s;content:counter(s);position:absolute;top:-14px;left:20px;width:32px;height:32px;border-radius:50%;background:var(--red);color:#fff;display:grid;place-items:center;font-weight:800;font-size:15px;box-shadow:0 4px 12px rgba(241,60,59,.3)}
.step h4{font-size:17px;font-weight:800;margin:10px 0 6px}
.step p{font-size:14px;color:var(--ink-sub)}

/* calc */
.calc{background:linear-gradient(135deg,#FFF1EE,#FFF8F0);border-radius:24px;padding:44px 32px;border:1px solid #FBDDD6}
.calc-in{display:grid;grid-template-columns:1fr 1fr;gap:32px;align-items:center}
.calc h3{font-size:26px;font-weight:800;margin-bottom:12px}
.calc p{color:var(--ink-sub);font-size:15px}
.calc-list{margin-top:18px;display:grid;gap:10px}
.calc-list div{display:flex;justify-content:space-between;background:#fff;border-radius:12px;padding:12px 16px;font-size:15px}
.calc-list b{color:var(--red);font-weight:800}
.calc-big{text-align:center}
.calc-big b{display:block;font-size:56px;font-weight:800;color:var(--red);line-height:1;font-variant-numeric:tabular-nums}
.calc-big span{font-size:14px;color:var(--ink-weak);display:block;margin-top:10px}

/* faq */
.faq{max-width:800px;margin:0 auto;display:grid;gap:12px}
details{background:var(--card);border-radius:14px;padding:0 22px;border:1px solid #FDEFEC}
details[open]{border-color:#FBDDD6}
summary{cursor:pointer;list-style:none;padding:20px 0;font-weight:700;font-size:16px;display:flex;justify-content:space-between;align-items:center}
summary::-webkit-details-marker{display:none}
summary:after{content:"+";color:var(--red);font-size:22px;font-weight:400}
details[open] summary:after{content:"−"}
details p{padding:0 0 20px;color:var(--ink-sub);font-size:15px}

/* footer */
footer{margin-top:40px;background:#fff;border-top:1px solid var(--line);padding:48px 0 32px}
.foot-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr;gap:32px}
.foot-grid h5{font-size:14px;font-weight:800;margin-bottom:12px;color:var(--ink)}
.foot-grid a,.foot-grid p{display:block;font-size:14px;color:var(--ink-weak);margin-bottom:8px;line-height:1.6}
.foot-grid a:hover{color:var(--red)}
.copy{margin-top:36px;padding-top:22px;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;font-size:13px;color:var(--ink-weak)}

/* doc pages */
.doc{padding:56px 0 80px}
.doc-in{max-width:820px;margin:0 auto;background:var(--card);border-radius:20px;padding:52px 56px;box-shadow:var(--shadow)}
.doc h1{font-size:32px;font-weight:800;margin-bottom:8px}
.doc .meta{color:var(--ink-weak);font-size:13px;padding-bottom:24px;border-bottom:1px solid var(--line);margin-bottom:32px}
.doc h2{font-size:20px;font-weight:800;margin:36px 0 12px;padding-left:12px;border-left:4px solid var(--red);border-radius:2px}
.doc h3{font-size:16px;font-weight:700;margin:22px 0 8px}
.doc p{color:var(--ink-sub);font-size:15px;margin-bottom:12px}
.doc ul,.doc ol{margin:0 0 14px 22px;color:var(--ink-sub);font-size:15px}
.doc li{margin-bottom:7px}
.doc strong{color:var(--ink)}
.doc .tip{background:var(--gold-bg);border-radius:12px;padding:14px 18px;font-size:14px;color:#7A5210;margin:18px 0}
.doc table{width:100%;border-collapse:collapse;margin:14px 0;font-size:14px}
.doc th,.doc td{border:1px solid var(--line);padding:10px 12px;text-align:left;color:var(--ink-sub)}
.doc th{background:#FFF6F3;color:var(--ink);font-weight:700}
.back{display:inline-flex;align-items:center;gap:6px;color:var(--red);font-size:14px;font-weight:700;margin-bottom:24px}

@media(max-width:900px){
  .cards,.steps{grid-template-columns:repeat(2,1fr)}
  .calc-in{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:640px){
  .hero{padding:44px 0 24px}
  .hero h1{font-size:30px}
  .hero p.sub{font-size:16px}
  .stats{grid-template-columns:repeat(3,1fr);gap:8px}
  .stat{padding:16px 8px}
  .stat b{font-size:24px}
  .stat span{font-size:12px}
  .cards,.steps{grid-template-columns:1fr}
  .sec{padding:48px 0}
  .sec-head h2{font-size:24px}
  .nav-links{display:none}
  .doc-in{padding:28px 22px;border-radius:16px}
  .doc h1{font-size:24px}
  .foot-grid{grid-template-columns:1fr}
}