/* 官网样式：桌面长页 / 手机按 4 个底部导航切割 */
html{scroll-behavior:smooth}
.wrap{max-width:1080px;margin:0 auto;padding:0 24px}
.sec{padding:64px 0;scroll-margin-top:64px}
.sec.band{background:var(--band)}
.sec.navy{background:var(--navy);color:#fff}
.eyebrow{font-size:10.5px;letter-spacing:1.4px;color:var(--blue);font-weight:700}
.h2{font-size:26px;font-weight:700;line-height:1.35;margin-top:9px}
.h2sub{font-size:13px;color:var(--muted);margin-top:9px;line-height:1.85;max-width:680px}
.center{text-align:center}
.center .h2sub{margin-left:auto;margin-right:auto}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:30px}
.grid4{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:30px}
.card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:20px}
.card .ic{width:36px;height:36px;border-radius:10px;background:var(--blue-l);color:var(--blue);
  display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:700}
.card h3{font-size:15px;margin-top:14px}
.card p{font-size:12.5px;color:var(--muted);margin-top:8px;line-height:1.85}
.card .mini{font-size:10.5px;color:var(--blue);margin-top:11px;font-weight:600}

.nav{position:sticky;top:0;z-index:20;height:64px;background:rgba(255,255,255,.96);
  backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.nav .wrap{height:64px;display:flex;align-items:center;gap:24px}
.brand{display:flex;align-items:center;gap:9px;flex-shrink:0;text-decoration:none}
.brand .lg{width:30px;height:30px;border-radius:9px;background:var(--blue);color:#fff;
  display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:700}
.brand .bn{font-size:15px;font-weight:700}
.brand .bs{font-size:9.5px;color:var(--muted);margin-top:-2px}
.navlinks{display:flex;gap:20px;margin-left:12px}
.navlinks a{font-size:12.5px;color:var(--muted)}
.navlinks a:hover{color:var(--blue)}
.nav .cta{margin-left:auto}
/* 邀请链接落地提示：关着开关时用中性黄说明「暂不可用」，不假装生效 */
.invite-bar{background:#FFF4E5;color:#8a5b12;font-size:11.5px;text-align:center;
  padding:8px 14px;line-height:1.6}
.invite-bar.ok{background:#EAF2FE;color:#12467c}
.invite-bar[hidden]{display:none}
.btn{display:inline-flex;align-items:center;justify-content:center;background:var(--blue);color:#fff;
  border:none;border-radius:10px;padding:10px 17px;font-size:12.5px;font-weight:600;cursor:pointer;font-family:inherit}
.btn.ghost{background:#fff;color:var(--blue);border:1px solid var(--line)}
.burger{display:none;margin-left:auto;width:34px;height:34px;border:1px solid var(--line);
  border-radius:9px;background:#fff;cursor:pointer;align-items:center;justify-content:center}
.burger svg{width:18px;height:18px}
.mobilemenu{display:none;position:absolute;top:64px;left:0;right:0;background:#fff;
  border-bottom:1px solid var(--line);padding:8px 24px 16px;box-shadow:0 12px 24px rgba(8,26,46,.08)}
.mobilemenu.on{display:block}
.mobilemenu a{display:block;padding:10px 0;font-size:13px;border-bottom:1px solid var(--band)}
.mobilemenu .btn{width:100%;margin-top:10px}

.hero{background:var(--navy);color:#fff;position:relative;overflow:hidden}
.hero .wrap{position:relative;padding-top:68px;padding-bottom:68px;
  display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center}
.badge{display:inline-flex;align-items:center;gap:7px;font-size:11px;color:#cfe2ff;
  border:1px solid rgba(207,226,255,.32);border-radius:20px;padding:5px 13px}
.badge i{width:6px;height:6px;border-radius:50%;background:#7fb2ff}
.hero h1{font-size:37px;line-height:1.3;font-weight:700;margin-top:20px;letter-spacing:-.8px}
.hero h1 em{font-style:normal;color:#8fc0ff}
.hero .lead{font-size:13.5px;color:#c3d5ea;line-height:1.95;margin-top:16px;max-width:500px}
.hero .acts{display:flex;gap:10px;margin-top:24px}
.hero .btn.light{background:#fff;color:var(--navy)}
/* 两个 CTA 原来都是白底，分不出主次；次按钮改成透明描边 */
.hero .btn.ghost{background:rgba(255,255,255,.08);color:#fff;
  border-color:rgba(255,255,255,.42)}
.hero .btn.ghost:hover{background:rgba(255,255,255,.16)}
.goldline{width:38px;height:2px;background:var(--gold);border-radius:2px;margin-top:26px}
.hero .foot{display:flex;gap:22px;margin-top:16px;flex-wrap:wrap}
.hero .foot div{font-size:11px;color:#a9c2dd}
.hero .foot b{color:#fff}
/* 头部右侧：真实界面截图，简洁描边，不再用纯 CSS 假手机模型 */
.heroshot{width:310px;margin:0 auto;background:#fff;border-radius:14px;overflow:hidden;
  box-shadow:0 18px 44px rgba(0,0,0,.24)}
.heroshot img{display:block;width:100%;height:auto}
.heroshot .hscap{font-size:10px;color:var(--muted);text-align:center;padding:8px;background:#fff}

.statbar{display:grid;grid-template-columns:repeat(4,1fr);background:#fff;border-bottom:1px solid var(--line)}
.statbar div{padding:20px 22px;border-right:1px solid var(--line);text-align:center}
.statbar div:last-child{border-right:none}
.statbar b{display:block;font-size:18px;color:var(--navy)}
.statbar span{display:block;font-size:10.5px;color:var(--muted);margin-top:3px}
.engines{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:30px}
.engine{background:#fff;border:1px solid var(--line);border-top:3px solid var(--blue);border-radius:14px;padding:22px}
.engine.b{border-top-color:var(--navy2)}
.engine .en{font-size:10px;color:var(--blue);font-weight:700;letter-spacing:1px}
.engine h3{font-size:17px;margin-top:7px}
.engine p{font-size:12px;color:var(--muted);margin-top:8px;line-height:1.8}
.engine li{font-size:11.5px;padding:6px 0;border-bottom:1px dashed var(--line);list-style:none}
.engine li:last-child{border:none}
.join{background:var(--navy);color:#fff;border-radius:14px;padding:16px 20px;margin-top:16px}
.join .jt{font-size:13px;font-weight:700}
.join .jd{font-size:11.5px;color:#b9cbe0;margin-top:4px;line-height:1.7}
.flow{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:30px}
.step{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px}
.step .no{font-size:10px;color:var(--blue);font-weight:700;letter-spacing:1px}
.step h3{font-size:13.5px;margin-top:8px}
.step p{font-size:11.5px;color:var(--muted);margin-top:6px;line-height:1.75}
.feat{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:30px}
.feat .f{background:#fff;border:1px solid var(--line);border-radius:12px;padding:15px}
.feat .ft{font-size:12px;font-weight:700}
.feat .fd{font-size:11px;color:var(--muted);margin-top:6px;line-height:1.7}
.feat .fp{font-size:9.5px;color:var(--blue);margin-top:8px;font-weight:600}
.ends{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:30px}
.end{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px}
.end .k{font-size:10px;color:var(--blue);font-weight:700}
.end h3{font-size:14px;margin-top:5px}
.end p{font-size:11.5px;color:var(--muted);margin-top:8px;line-height:1.8}
.rules{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin-top:30px}
.rule{display:flex;gap:11px;padding:15px;border-radius:12px;
  border:1px solid rgba(255,255,255,.16);background:rgba(255,255,255,.05)}
.rule .ri{width:28px;height:28px;border-radius:9px;background:rgba(143,192,255,.16);
  color:#8fc0ff;display:flex;align-items:center;justify-content:center;flex-shrink:0;font-size:13px}
.rule .rt{font-size:12.5px;font-weight:600;color:#fff}
.rule .rd{font-size:11px;color:#a9c2dd;margin-top:4px;line-height:1.7}
.cycle{display:inline-flex;border:1px solid var(--line);border-radius:20px;padding:3px;background:#fff;margin-top:18px}
.cycle span{font-size:11.5px;padding:6px 15px;border-radius:16px;color:var(--muted);cursor:pointer}
.cycle span.on{background:var(--blue);color:#fff;font-weight:600}
.plans{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:28px}
.plan{background:#fff;border:1px solid var(--line);border-radius:14px;padding:22px;display:flex;flex-direction:column}
.plan.hot{border-color:var(--blue);box-shadow:0 10px 28px rgba(22,104,220,.12)}
.plan .pn{font-size:14px;font-weight:700}
.plan .pd{font-size:11px;color:var(--muted);margin-top:4px}
.plan .price{font-size:27px;font-weight:700;color:var(--navy);margin-top:16px}
.plan .price small{font-size:12px;color:var(--muted);font-weight:400}
.plan .save{font-size:10.5px;color:var(--blue);margin-top:4px;height:14px}
.plan ul{list-style:none;margin-top:12px;flex:1}
.plan li{font-size:11.5px;padding:6px 0;border-bottom:1px dashed var(--line)}
.plan li:last-child{border:none}
.plan .btn{width:100%;margin-top:16px}
.plannote{font-size:11px;color:var(--muted);text-align:center;margin-top:16px;line-height:1.8}
.faq{max-width:740px;margin:26px auto 0}
.faq details{border:1px solid var(--line);border-radius:12px;background:#fff;margin-bottom:10px;padding:0 17px}
.faq summary{font-size:13px;font-weight:600;padding:15px 0;cursor:pointer;list-style:none;
  display:flex;justify-content:space-between}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:17px;color:var(--blue);font-weight:400}
.faq details[open] summary::after{content:"−"}
.faq .ans{font-size:12px;color:var(--muted);line-height:1.9;padding:0 0 15px}
.cta-band{background:linear-gradient(120deg,var(--navy),var(--navy2));color:#fff;border-radius:16px;
  padding:34px 38px;display:flex;align-items:center;gap:22px}
.cta-band h3{font-size:21px}
.cta-band p{font-size:12.5px;color:#b9cbe0;margin-top:8px;line-height:1.8}
.cta-band .btn{margin-left:auto;flex-shrink:0;background:#fff;color:var(--navy)}
footer{background:#061424;color:#8fa8c4;padding:32px 0;font-size:11.5px}
footer .fb{font-size:13px;color:#fff;font-weight:700}
footer .copy{border-top:1px solid rgba(255,255,255,.1);margin-top:20px;padding-top:16px;font-size:10.5px;color:#6f879f}

.mask{position:fixed;inset:0;background:rgba(6,20,36,.62);z-index:40;display:none;
  align-items:center;justify-content:center;padding:20px}
.mask.on{display:flex}
.modal{background:#fff;border-radius:16px;width:100%;max-width:410px;padding:24px}
.modal .mh{display:flex;align-items:center}
.modal h3{font-size:17px}
.modal .x{margin-left:auto;width:28px;height:28px;border-radius:8px;border:1px solid var(--line);
  background:#fff;cursor:pointer;color:var(--muted);font-size:16px}
.modal .ms{font-size:11.5px;color:var(--muted);margin-top:6px;line-height:1.7}
.modal .fld{margin-top:12px}
.modal .fld label{display:block;font-size:11px;color:var(--muted);margin-bottom:5px}
.modal .fld input,.modal .fld select{width:100%;height:38px;border:1px solid var(--line);
  border-radius:9px;padding:0 10px;font-size:12.5px;outline:none;font-family:inherit;background:#fff}
.toast{position:fixed;bottom:76px;left:50%;transform:translateX(-50%);z-index:50;
  background:rgba(10,20,30,.94);color:#fff;font-size:12px;padding:10px 18px;border-radius:20px;display:none}

/* 手机：底部 4 导航切割，桌面隐藏 */
.site-tabbar{display:none}
@media(max-width:860px){
  .wrap{padding:0 16px}
  .sec{padding:40px 0}
  .h2{font-size:21px}
  .navlinks,.nav .cta{display:none}
  .burger{display:flex}
  .hero .wrap{grid-template-columns:1fr;gap:30px;padding-top:44px;padding-bottom:44px}
  .hero h1{font-size:28px}
  .heroshot{width:250px}
  .grid3,.grid4,.feat,.flow,.ends,.engines,.plans,.rules{grid-template-columns:1fr 1fr}
  .statbar{grid-template-columns:1fr 1fr}
  .statbar div:nth-child(2){border-right:none}
  .statbar div:nth-child(-n+2){border-bottom:1px solid var(--line)}
  .cta-band{flex-direction:column;align-items:flex-start;padding:26px 22px}
  .cta-band .btn{margin-left:0}
  body{padding-bottom:58px}
  .site-tabbar{display:flex;position:fixed;bottom:0;left:0;right:0;height:58px;background:#fff;
    border-top:1px solid var(--line);z-index:25}
  .site-tabbar a{flex:1;display:flex;align-items:center;justify-content:center;
    font-size:11px;color:var(--muted);cursor:pointer;border-right:1px solid var(--band)}
  .site-tabbar a:last-child{border-right:none}
  .site-tabbar a.on{color:var(--blue);font-weight:700;box-shadow:inset 0 -3px 0 var(--blue)}
  .nav{position:sticky}
}
@media(max-width:560px){
  .grid3,.grid4,.feat,.flow,.ends,.engines,.plans,.rules{grid-template-columns:1fr}
  .hero h1{font-size:25px}
  .hero .acts{flex-direction:column;align-items:flex-start}
  .hero .acts .btn{width:100%}
}
@media(min-width:861px){ .site-tabbar{display:none} }