:root{
    --red:#ff0000;
    --ink:#121212;
    --inv:#121212;
    --paper:#ffffff;
    --mist:#f3f3f3;
    --line:#121212;
    --ease:cubic-bezier(0.22,1,0.36,1);
    --zh:"PingFang SC","Noto Sans CJK SC","Source Han Sans SC","Microsoft YaHei","Heiti SC",sans-serif;
    --en:"Helvetica Neue","Arial Black","Arial Narrow",Arial,sans-serif;
    --navh:64px;
  }
  *{margin:0;padding:0;box-sizing:border-box;border-radius:0!important;}
  html{scroll-behavior:smooth;}
  body{
    font-family:var(--zh);
    color:var(--ink);
    background:var(--paper);
    -webkit-font-smoothing:antialiased;
    overflow-x:hidden;
  }
  section{scroll-margin-top:var(--navh);}
  ::selection{background:var(--red);color:#fff;}

  /* ---------- announcement + nav ---------- */
  .announce{
    width:100%;background:var(--paper);color:var(--ink);
    border-bottom:1px solid var(--line);
    font-size:12px;letter-spacing:.35em;text-transform:uppercase;
    font-family:var(--en);
    padding:10px 24px;text-align:center;
  }
  .announce b{color:var(--red);font-weight:700;}
  .nav{
    position:sticky;top:0;z-index:100;
    background:var(--paper);border-bottom:1px solid var(--line);
    height:var(--navh);display:flex;align-items:center;justify-content:space-between;
    padding:0 4vw;
  }
  .nav .logo{font-weight:900;font-size:20px;letter-spacing:.06em;display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);}
  .nav .logo i{display:inline-block;width:12px;height:12px;background:var(--red);}
  .nav .links{display:flex;align-items:center;gap:34px;}
  .nav .links a{
    color:var(--ink);text-decoration:none;font-size:14px;letter-spacing:.08em;position:relative;padding:4px 0;
  }
  .nav .links a::after{content:"";position:absolute;left:0;bottom:0;height:2px;width:0;background:var(--red);transition:width .3s var(--ease);}
  .nav .links a:hover::after{width:100%;}
  .nav .cta-btn{
    background:var(--red);color:#fff;text-decoration:none;font-size:14px;letter-spacing:.1em;
    padding:10px 22px;
  }
  .nav .cta-btn:hover{background:var(--inv);}
  .nav .links a.cta-btn{color:#fff;}
  .nav .login-btn{
    border:1.5px solid var(--ink);color:var(--ink);text-decoration:none;
    font-size:13px;letter-spacing:.14em;font-weight:700;padding:9px 20px;
    transition:all .25s var(--ease);white-space:nowrap;
  }
  .nav .login-btn:hover{background:var(--ink);color:var(--paper);}
  .mobile-menu .mg-login{
    display:block;margin:10px 6vw 0;padding:14px 18px;text-align:center;
    background:var(--red);color:#fff;text-decoration:none;
    font-size:15px;font-weight:700;letter-spacing:.2em;
  }
  @media(max-width:900px){.nav .links .drop-group{display:none;}.nav .links a:not(.cta-btn):not(.login-btn){display:none;}}
  /* dropdown */
  .nav .drop-group{position:relative;}
  .nav .drop-group .dg-t::before{content:"▾ ";font-size:10px;color:var(--red);}
  .nav .drop{
    display:none;position:absolute;top:100%;left:50%;transform:translateX(-50%);
    background:var(--paper);border:1px solid var(--ink);min-width:160px;padding:6px 0;
  }
  .nav .drop-group:hover .drop,.nav .drop-group:focus-within .drop{display:block;}
  .nav .drop a{display:block;padding:11px 20px;font-size:13px;letter-spacing:.06em;white-space:nowrap;}
  .nav .drop a::after{display:none;}
  .nav .drop a:hover{background:var(--inv);color:#fff;}
  .nav .drop-group.act > .dg-t{color:var(--red);font-weight:700;}
  .nav-burger{display:none;background:none;border:1.5px solid var(--ink);width:38px;height:38px;cursor:pointer;position:relative;}
  .nav-burger span{position:absolute;left:8px;right:8px;height:2px;background:var(--ink);}
  .nav-burger span:nth-child(1){top:12px;}
  .nav-burger span:nth-child(2){top:17px;}
  .nav-burger span:nth-child(3){top:22px;}
  @media(max-width:900px){.nav-burger{display:block;}}
  .mobile-menu{
    display:none;position:fixed;top:calc(var(--navh) + 37px);left:0;right:0;z-index:99;
    background:var(--paper);border-bottom:1px solid var(--line);
  }
  .mobile-menu.open{display:block;}
  .mobile-menu a{display:block;padding:16px 6vw;color:var(--ink);text-decoration:none;font-size:16px;border-top:1px solid #e5e5e5;}
  .mobile-menu a.hot{color:var(--red);font-weight:700;}
  .mobile-menu .mg-t{
    display:flex;justify-content:space-between;align-items:center;width:100%;
    padding:16px 6vw;background:none;border:none;border-top:1px solid #e5e5e5;
    font-size:16px;color:var(--ink);cursor:pointer;font-family:inherit;
  }
  .mobile-menu .mg-t i{font-style:normal;color:var(--red);transition:transform .3s var(--ease);}
  .mobile-menu .mg-l{display:none;}
  .mobile-menu .mg.open .mg-l{display:block;}
  .mobile-menu .mg.open .mg-t i{transform:rotate(45deg);}
  .mobile-menu .mg-l a{padding:12px 6vw 12px calc(6vw + 20px);font-size:14px;color:#444;}

  /* ---------- shared ---------- */
  .sec-label{
    font-family:var(--en);font-size:11px;letter-spacing:.4em;text-transform:uppercase;
    display:flex;align-items:center;gap:10px;margin-bottom:22px;
  }
  .sec-label::before{content:"";display:block;width:28px;height:2px;background:var(--red);}
  h2.sec-title{font-size:clamp(32px,4.4vw,60px);font-weight:900;line-height:1.15;}
  h2.sec-title em{font-style:normal;color:var(--red);}

  /* ---------- hero ---------- */
  .hero{
    min-height:calc(100vh - var(--navh) - 38px);
    display:flex;flex-direction:column;justify-content:center;position:relative;
    padding:72px 6vw 56px;background:var(--paper);overflow:hidden;
  }
  .hero h1{
    font-size:clamp(46px,7.4vw,116px);font-weight:900;line-height:1.06;letter-spacing:.01em;
    max-width:12em;
  }
  .hero h1 .red{color:var(--red);}
  .hero-sub{margin-top:30px;font-size:16px;line-height:2;max-width:36em;color:#333;}
  .hero-ctas{margin-top:40px;display:flex;flex-wrap:wrap;gap:16px;}
  .btn{
    display:inline-block;text-decoration:none;font-size:15px;letter-spacing:.12em;
    padding:16px 34px;border:1.5px solid var(--ink);color:var(--ink);transition:all .3s var(--ease);
  }
  .btn:hover{background:var(--inv);color:#fff;}
  .btn.primary{background:var(--red);border-color:var(--red);color:#fff;}
  .btn.primary:hover{background:var(--inv);border-color:var(--ink);}
  .hero-trust{
    margin-top:56px;display:flex;flex-wrap:wrap;gap:0;border-top:1px solid var(--line);
  }
  .hero-trust .t{
    flex:1 1 200px;padding:20px 24px 4px 0;font-size:13px;letter-spacing:.06em;color:#444;
  }
  .hero-trust .t b{display:block;color:var(--ink);font-size:15px;margin-bottom:6px;}
  .hero-bgword{
    position:absolute;right:-1vw;top:-2vw;font-weight:900;
    font-size:clamp(120px,22vw,340px);line-height:1;color:var(--mist);
    pointer-events:none;user-select:none;font-family:var(--zh);
  }

  /* ---------- pain points ---------- */
  .pain{border-top:1px solid var(--line);background:var(--mist);}
  .pain-inner{max-width:1400px;margin:0 auto;padding:96px 6vw;}
  .pain-grid{display:grid;grid-template-columns:repeat(4,1fr);border:1px solid var(--line);margin-top:52px;background:var(--paper);}
  @media(max-width:1000px){.pain-grid{grid-template-columns:repeat(2,1fr);}}
  @media(max-width:560px){.pain-grid{grid-template-columns:1fr;}}
  .pain-item{padding:38px 30px 44px;border-right:1px solid var(--line);border-bottom:1px solid var(--line);position:relative;}
  .pain-item .no{font-family:var(--en);font-size:11px;letter-spacing:.3em;color:var(--red);margin-bottom:18px;}
  .pain-item h3{font-size:22px;font-weight:900;margin-bottom:14px;}
  .pain-item p{font-size:14px;line-height:1.95;color:#444;}
  .pain-hook{
    margin-top:40px;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:20px;
    background:var(--inv);color:#fff;padding:30px 34px;
  }
  .pain-hook .l{font-size:18px;font-weight:700;line-height:1.7;}
  .pain-hook .l small{display:block;font-weight:400;font-size:13px;opacity:.7;margin-top:6px;}
  .pain-hook .btn{border-color:#fff;color:#fff;}
  .pain-hook .btn:hover{background:#fff;color:var(--inv);}

  /* ---------- what we are (split) ---------- */
  .split{display:flex;flex-direction:column;border-top:1px solid var(--line);position:relative;}
  @media(min-width:900px){.split{flex-direction:row;min-height:80vh;}}
  .split-half{
    flex:1 1 50%;position:relative;display:flex;flex-direction:column;justify-content:center;
    padding:80px 6vw;
  }
  .split-new{background:var(--paper);}
  .split-old{background:var(--red);color:#fff;}
  .split-half h3{font-size:clamp(34px,4.4vw,62px);font-weight:900;line-height:1.12;margin-bottom:24px;}
  .split-new h3 .red{color:var(--red);}
  .split-half p{font-size:15px;line-height:2;max-width:32em;}
  .split-old p{color:rgba(255,255,255,.92);}
  .split .vs{
    position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);z-index:5;
    background:var(--inv);color:#fff;font-family:var(--en);font-size:10px;letter-spacing:.3em;padding:9px 12px;
  }
  @media(max-width:899px){.split .vs{display:none;}}
  .cards3{display:grid;grid-template-columns:repeat(3,1fr);border:1px solid var(--line);margin-top:0;background:var(--paper);}
  @media(max-width:820px){.cards3{grid-template-columns:1fr;}}
  .cards2{grid-template-columns:1fr 1fr;}
  @media(max-width:820px){.cards2{grid-template-columns:1fr;}}
  @media(min-width:821px){.cards2 .c:first-child{border-right:1px solid var(--line);}}
  @media(max-width:820px){.cards2 .c:first-child{border-right:none;border-bottom:1px solid var(--line);}}
  .hero-valuejump{margin-top:34px;font-size:14px;color:#888;}
  .hero-valuejump a{color:var(--red);text-decoration:none;font-weight:700;border-bottom:1.5px solid var(--red);padding-bottom:2px;}
  .cards4{grid-template-columns:repeat(4,1fr);}
  @media(max-width:1080px){.cards4{grid-template-columns:repeat(2,1fr);}}
  @media(max-width:640px){.cards4{grid-template-columns:1fr;}}
  @media(min-width:1081px){.cards4 .c:nth-child(4){border-right:none;}}
  @media(max-width:1080px) and (min-width:641px){.cards4 .c:nth-child(2){border-right:none;}}
  .faq-sec{background:var(--mist);}
  .faq-inner{max-width:1000px;margin:0 auto;padding:96px 6vw;}

  /* ---------- generic inner sections (subpages) ---------- */
  .about{background:var(--paper);}
  .about-inner{max-width:1400px;margin:0 auto;padding:96px 6vw;}
  .sec-desc{margin-top:22px;font-size:15px;line-height:2;color:#444;max-width:46em;}
  .about-inner .cards3{margin-top:52px;}
  .about-inner .chain-row{margin-top:52px;}
  .cards3 .c{padding:40px 34px 48px;border-right:1px solid var(--line);}
  .cards3 .c:last-child{border-right:none;}
  @media(max-width:820px){.cards3 .c{border-right:none;border-bottom:1px solid var(--line);}}
  .cards3 .c .k{font-family:var(--en);font-size:10px;letter-spacing:.35em;color:var(--red);margin-bottom:16px;}
  .cards3 .c h4{font-size:22px;font-weight:900;margin-bottom:14px;}
  .cards3 .c p{font-size:14px;line-height:1.95;color:#444;}
  .chain-row{
    display:flex;flex-wrap:wrap;align-items:center;gap:12px;padding:36px 6vw;border-top:1px solid var(--line);
    font-size:14px;letter-spacing:.06em;background:var(--paper);
  }
  .chain-row .node{border:1.5px solid var(--ink);padding:9px 16px;}
  .chain-row .node.hot{background:var(--red);border-color:var(--red);color:#fff;}
  .chain-row .arrow{font-family:var(--en);color:var(--red);font-size:18px;}
  .chain-row .lab{font-family:var(--en);font-size:10px;letter-spacing:.35em;color:#888;margin-right:10px;}

  /* ---------- comparison rows ---------- */
  .compare-head{padding:96px 6vw 64px;background:var(--paper);border-top:1px solid var(--line);}
  .row{display:flex;flex-direction:column;min-height:74vh;border-bottom:1px solid var(--line);position:relative;}
  @media(min-width:768px){.row{flex-direction:row;}}
  .cell{flex:1 1 50%;padding:72px 6vw;display:flex;flex-direction:column;justify-content:center;position:relative;}
  .cell-old{background:var(--mist);}
  .cell-new{background:var(--paper);}
  .cell-new.hot{background:var(--red);color:#fff;}
  .row.flip .cell-old{order:2;}
  @media(max-width:767px){.cell{padding:56px 8vw;}}
  .cell .no{font-family:var(--en);font-size:11px;letter-spacing:.4em;text-transform:uppercase;opacity:.6;margin-bottom:22px;}
  .cell h3{font-size:clamp(30px,4.2vw,58px);font-weight:900;line-height:1.12;margin-bottom:24px;}
  .cell.hot h3{color:#fff;}
  .cell p{font-size:15px;line-height:2;max-width:32em;}
  .cell .stamp{
    position:absolute;top:30px;right:6vw;
    font-family:var(--en);font-size:10px;letter-spacing:.35em;text-transform:uppercase;
    border:1.5px solid currentColor;padding:6px 10px;
  }
  .cell-old .stamp{opacity:.5;}
  .cell-new.hot .stamp{color:#fff;}
  .hotline{color:var(--red);font-weight:700;}
  .cell.hot .hotline{color:#fff;}
  .vs{
    position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);z-index:4;
    background:var(--inv);color:#fff;font-family:var(--en);
    font-size:10px;letter-spacing:.3em;padding:9px 12px;
  }
  @media(max-width:767px){.vs{display:none;}}

  /* ---------- rotating interlude ---------- */
  .interlude{
    background:var(--red);color:#fff;min-height:86vh;
    display:flex;align-items:center;justify-content:center;position:relative;overflow:hidden;
  }
  .orbit{position:relative;width:min(72vw,460px);height:min(72vw,460px);}
  .orbit svg{width:100%;height:100%;display:block;animation:spin 26s linear infinite;}
  @keyframes spin{to{transform:rotate(360deg);}}
  .orbit-core{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;}
  .orbit-core .big{font-size:clamp(88px,16vw,160px);font-weight:900;line-height:1;}
  .orbit-core .cap{margin-top:14px;font-size:14px;letter-spacing:.5em;text-indent:.5em;}
  .interlude-side{position:absolute;font-family:var(--en);font-size:10px;letter-spacing:.4em;text-transform:uppercase;opacity:.85;}
  .interlude-side.a{top:32px;left:32px;}
  .interlude-side.b{bottom:32px;right:32px;}

  /* ---------- ability ---------- */
  .ability{border-top:1px solid var(--line);background:var(--paper);}
  .ability-inner{max-width:1400px;margin:0 auto;padding:96px 6vw 0;}
  .screen-banner{
    background:var(--red);color:#fff;border:1px solid var(--line);border-bottom:none;
    margin-top:52px;display:flex;flex-wrap:wrap;align-items:center;gap:34px;padding:46px 44px;
  }
  .screen-banner .word{font-size:clamp(52px,6vw,88px);font-weight:900;line-height:1;letter-spacing:.04em;}
  .screen-banner .tx{flex:1;min-width:260px;}
  .screen-banner .tx .k{font-family:var(--en);font-size:10px;letter-spacing:.35em;opacity:.85;margin-bottom:12px;}
  .screen-banner .tx h4{font-size:22px;font-weight:900;margin-bottom:12px;}
  .screen-banner .tx p{font-size:14px;line-height:2;color:rgba(255,255,255,.92);max-width:34em;}
  .five{display:grid;grid-template-columns:repeat(5,1fr);border:1px solid var(--line);background:var(--paper);}
  @media(max-width:1000px){.five{grid-template-columns:repeat(2,1fr);}}
  @media(max-width:560px){.five{grid-template-columns:1fr;}}
  .five .f{padding:34px 26px 42px;border-right:1px solid var(--line);position:relative;}
  .five .f:last-child{border-right:none;}
  @media(max-width:1000px){.five .f{border-bottom:1px solid var(--line);}.five .f:nth-child(odd){border-right:1px solid var(--line);}}
  .five .f .ic{font-weight:900;font-size:26px;margin-bottom:16px;color:var(--red);}
  .five .f h4{font-size:18px;font-weight:900;margin-bottom:12px;}
  .five .f p{font-size:13px;line-height:1.9;color:#555;}
  .duo{display:grid;grid-template-columns:1fr 1fr;border:1px solid var(--line);border-top:none;background:var(--paper);}
  @media(max-width:820px){.duo{grid-template-columns:1fr;}}
  .duo .d{padding:48px 40px 56px;}
  .duo .d:first-child{border-right:1px solid var(--line);}
  @media(max-width:820px){.duo .d:first-child{border-right:none;border-bottom:1px solid var(--line);}}
  .duo .d .k{font-family:var(--en);font-size:10px;letter-spacing:.35em;color:var(--red);margin-bottom:16px;}
  .duo .d h4{font-size:26px;font-weight:900;margin-bottom:22px;}
  .duo .d ul{list-style:none;}
  .duo .d li{
    font-size:14px;line-height:1.6;padding:13px 0 13px 22px;border-top:1px solid #e5e5e5;position:relative;color:#333;
  }
  .duo .d li::before{content:"";position:absolute;left:0;top:22px;width:8px;height:8px;background:var(--red);}
  .ai-flow{border:1px solid var(--line);border-top:none;background:var(--mist);padding:56px 40px 64px;margin-bottom:96px;}
  .ai-flow h4{font-size:24px;font-weight:900;margin-bottom:8px;}
  .ai-flow .sub{font-size:13px;color:#666;margin-bottom:34px;}
  .ai-steps{display:flex;flex-wrap:wrap;align-items:stretch;gap:0;}
  .ai-step{
    flex:1 1 220px;background:var(--paper);border:1px solid var(--line);padding:28px 26px 34px;margin-right:-1px;position:relative;
  }
  .ai-step .n{font-family:var(--en);font-size:11px;letter-spacing:.3em;color:var(--red);margin-bottom:14px;}
  .ai-step h5{font-size:18px;font-weight:900;margin-bottom:12px;}
  .ai-step p{font-size:13px;line-height:1.9;color:#444;}
  .ai-note{margin-top:28px;font-size:14px;font-weight:700;}
  .ai-note span{color:var(--red);}

  /* ---------- case ---------- */
  .case{background:var(--inv);color:#fff;border-top:1px solid var(--line);}
  .case-inner{max-width:1400px;margin:0 auto;padding:96px 6vw;}
  .case .sec-label{color:#fff;}
  .case h2.sec-title{color:#fff;}
  .case-grid{display:grid;grid-template-columns:1.2fr 1fr;gap:0;margin-top:56px;border:1px solid #3a3a3a;}
  @media(max-width:900px){.case-grid{grid-template-columns:1fr;}}
  .case-main{padding:52px 44px 60px;border-right:1px solid #3a3a3a;}
  @media(max-width:900px){.case-main{border-right:none;border-bottom:1px solid #3a3a3a;}}
  .case-main .big{font-size:clamp(40px,5vw,72px);font-weight:900;line-height:1.12;margin-bottom:26px;}
  .case-main .big em{font-style:normal;color:var(--red);}
  .case-main p{font-size:15px;line-height:2;color:#cfcfcf;max-width:30em;}
  .case-side{display:flex;flex-direction:column;}
  .case-side .it{padding:34px 40px;border-bottom:1px solid #3a3a3a;flex:1;display:flex;flex-direction:column;justify-content:center;}
  .case-side .it:last-child{border-bottom:none;}
  .case-side .it .k{font-family:var(--en);font-size:10px;letter-spacing:.35em;color:var(--red);margin-bottom:12px;}
  .case-side .it h5{font-size:19px;font-weight:900;margin-bottom:10px;}
  .case-side .it p{font-size:13px;line-height:1.9;color:#bdbdbd;}

  /* ---------- steps ---------- */
  .steps{background:var(--paper);border-top:1px solid var(--line);}
  .steps-inner{max-width:1400px;margin:0 auto;padding:96px 6vw;}
  .steps-row{display:flex;flex-wrap:wrap;margin-top:56px;border:1px solid var(--line);}
  .step{flex:1 1 220px;padding:40px 30px 48px;border-right:1px solid var(--line);position:relative;background:var(--paper);}
  .step:last-child{border-right:none;background:var(--red);color:#fff;}
  @media(max-width:900px){.step{border-right:none;border-bottom:1px solid var(--line);}}
  .step .n{font-size:44px;font-weight:900;color:var(--mist);line-height:1;margin-bottom:20px;}
  .step:last-child .n{color:rgba(255,255,255,.4);}
  .step h4{font-size:20px;font-weight:900;margin-bottom:14px;}
  .step p{font-size:13px;line-height:1.9;color:#555;}
  .step:last-child p{color:rgba(255,255,255,.92);}
  .step .dur{margin-top:18px;font-family:var(--en);font-size:10px;letter-spacing:.3em;color:var(--red);}
  .step:last-child .dur{color:#fff;}

  /* ---------- reveal motion ---------- */
  .rv{transition:opacity .9s var(--ease),transform .9s var(--ease);}
  .js-rv .rv{opacity:0;transform:translateY(34px);}
  .js-rv .rv.on{opacity:1;transform:none;}
  .rv.on{opacity:1;transform:none;}
  .no-js .rv{opacity:1;transform:none;}
  .rv-d1{transition-delay:.08s;}
  .rv-d2{transition-delay:.16s;}
  .rv-d3{transition-delay:.24s;}
  @media(prefers-reduced-motion:reduce){
    .rv{opacity:1;transform:none;transition:none;}
    .orbit svg{animation:none;}
    html{scroll-behavior:auto;}
  }

/* ---------- cooperation ---------- */
  .coop{background:var(--mist);border-top:1px solid var(--line);}
  .coop-inner{max-width:1400px;margin:0 auto;padding:96px 6vw;}
  .modes{display:grid;grid-template-columns:repeat(3,1fr);border:1px solid var(--line);margin-top:52px;background:var(--paper);}
  @media(max-width:900px){.modes{grid-template-columns:1fr;}}
  .mode{padding:44px 36px 52px;border-right:1px solid var(--line);position:relative;}
  .mode:last-child{border-right:none;background:var(--inv);color:#fff;}
  @media(max-width:900px){.mode{border-right:none;border-bottom:1px solid var(--line);}}
  .mode .k{font-family:var(--en);font-size:10px;letter-spacing:.35em;color:var(--red);margin-bottom:16px;}
  .mode h4{font-size:24px;font-weight:900;margin-bottom:16px;}
  .mode p{font-size:14px;line-height:1.95;color:#444;}
  .mode:last-child p{color:#cfcfcf;}
  .mode ul{list-style:none;margin-top:18px;}
  .mode li{font-size:13px;padding:10px 0 10px 20px;border-top:1px solid #e5e5e5;position:relative;color:#333;}
  .mode:last-child li{border-top-color:#3a3a3a;color:#cfcfcf;}
  .mode li::before{content:"";position:absolute;left:0;top:18px;width:7px;height:7px;background:var(--red);}
  .faq{margin-top:64px;}
  .faq h3{font-size:26px;font-weight:900;margin-bottom:28px;}
  .faq-item{border-top:1px solid var(--line);background:var(--paper);}
  .faq-q{
    width:100%;background:none;border:none;cursor:pointer;text-align:left;
    display:flex;justify-content:space-between;align-items:center;gap:20px;
    padding:24px 28px;font-family:var(--zh);font-size:17px;font-weight:700;color:var(--ink);
  }
  .faq-q .pm{font-family:var(--en);font-size:22px;color:var(--red);flex:none;transition:transform .3s var(--ease);}
  .faq-item.open .faq-q .pm{transform:rotate(45deg);}
  .faq-a{max-height:0;overflow:hidden;transition:max-height .5s var(--ease);}
  .faq-a p{padding:0 28px 26px;font-size:14px;line-height:2;color:#444;max-width:52em;}
  .faq-item.open .faq-a{max-height:220px;}

  /* ---------- contact CTA ---------- */
  .contact{background:var(--red);color:#fff;border-top:1px solid var(--line);position:relative;overflow:hidden;}
  .contact-inner{max-width:1400px;margin:0 auto;padding:110px 6vw 90px;position:relative;}
  .contact h2{font-size:clamp(38px,6vw,92px);font-weight:900;line-height:1.12;max-width:14em;}
  .contact .lead{margin-top:26px;font-size:16px;line-height:2;color:rgba(255,255,255,.92);max-width:34em;}
  .contact .hero-ctas{margin-top:44px;}
  .contact .btn{border-color:#fff;color:#fff;}
  .contact .btn:hover{background:#fff;color:var(--red);}
  .contact .btn.primary{background:var(--inv);border-color:var(--ink);color:#fff;}
  .contact .btn.primary:hover{background:#fff;border-color:#fff;color:var(--red);}
  .contact .hint{margin-top:30px;font-size:13px;color:rgba(255,255,255,.8);letter-spacing:.05em;}
  .contact .bgword{
    position:absolute;right:-2vw;bottom:-6vw;font-weight:900;
    font-size:clamp(140px,24vw,360px);line-height:1;color:rgba(255,255,255,.14);
    pointer-events:none;user-select:none;
  }

  /* ---------- footer ---------- */
  footer.site{background:var(--inv);color:#fff;border-top:1px solid #000;}
  .foot-grid{
    max-width:1400px;margin:0 auto;padding:64px 6vw 40px;
    display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;
  }
  @media(max-width:820px){.foot-grid{grid-template-columns:1fr;}}
  .foot-grid .fw .logo{font-weight:900;font-size:24px;display:flex;align-items:center;gap:10px;margin-bottom:16px;}
  .foot-grid .fw .logo i{display:inline-block;width:12px;height:12px;background:var(--red);}
  .foot-grid .fw p{font-size:13px;line-height:2;color:#999;max-width:26em;}
  .foot-grid .fw h6{font-family:var(--en);font-size:10px;letter-spacing:.35em;color:#777;margin-bottom:18px;}
  .foot-grid .fw a{display:block;color:#ccc;text-decoration:none;font-size:14px;padding:7px 0;}
  .foot-grid .fw a:hover{color:#fff;}
  .foot-bottom{
    max-width:1400px;margin:0 auto;padding:22px 6vw 30px;border-top:1px solid #2c2c2c;
    display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;
    font-family:var(--en);font-size:10px;letter-spacing:.3em;text-transform:uppercase;color:#666;
  }

  /* ---------- subpage head ---------- */
  .page-head{padding:80px 6vw 76px;border-bottom:1px solid var(--line);background:var(--paper);position:relative;overflow:hidden;}
  .page-head h1{font-size:clamp(40px,5.6vw,86px);font-weight:900;line-height:1.1;max-width:14em;}
  .page-head h1 em{font-style:normal;color:var(--red);}
  .page-head .lead{margin-top:26px;font-size:16px;line-height:2;color:#333;max-width:36em;}
  .crumb{
    position:sticky;top:var(--navh);z-index:95;
    background:var(--paper);border-bottom:1px solid var(--line);
    padding:11px 6vw;font-size:13px;letter-spacing:.12em;
    display:flex;gap:10px;align-items:center;
  }
  .crumb::before{content:"";width:10px;height:10px;background:var(--red);flex:none;}
  .crumb a{color:#666;text-decoration:none;}
  .crumb a:hover{color:var(--red);}
  .crumb span{color:#8a8a8a;}
  .crumb b{color:var(--ink);font-weight:700;}

  /* nav active */
  .nav .links a.act{color:var(--red);font-weight:700;}
  .nav .links a.act::after{width:100%;}

  /* six teaser (home) */
  .teaser{border-top:1px solid var(--line);background:var(--paper);}
  .teaser-inner{max-width:1400px;margin:0 auto;padding:96px 6vw;}
  .teaser-grid{display:grid;grid-template-columns:repeat(3,1fr);border:1px solid var(--line);margin-top:52px;}
  @media(max-width:900px){.teaser-grid{grid-template-columns:1fr;}}
  .teaser-grid a{
    display:block;padding:38px 32px 46px;border-right:1px solid var(--line);border-bottom:1px solid var(--line);
    color:var(--ink);text-decoration:none;transition:background .3s var(--ease),color .3s var(--ease);
  }
  .teaser-grid a:hover{background:var(--red);color:#fff;}
  .teaser-grid a .no{font-family:var(--en);font-size:11px;letter-spacing:.35em;opacity:.6;margin-bottom:16px;}
  .teaser-grid a h3{font-size:24px;font-weight:900;line-height:1.3;margin-bottom:12px;}
  .teaser-grid a p{font-size:13px;line-height:1.9;opacity:.75;}
  .teaser-more{margin-top:34px;}

  /* ---------- tips (对比页) ---------- */
  .tips{background:var(--paper);}
  .tips-inner{max-width:1400px;margin:0 auto;padding:96px 6vw;}
  .tips-grid{display:grid;grid-template-columns:1fr 1fr;border:1px solid var(--line);margin-top:52px;}
  @media(max-width:820px){.tips-grid{grid-template-columns:1fr;}}
  .tip{padding:48px 40px 56px;}
  .tip:first-child{border-right:1px solid var(--line);}
  @media(max-width:820px){.tip:first-child{border-right:none;border-bottom:1px solid var(--line);}}
  .tip .no{font-family:var(--en);font-size:11px;letter-spacing:.4em;color:var(--red);margin-bottom:20px;}
  .tip h3{font-size:clamp(22px,2.4vw,32px);font-weight:900;margin-bottom:18px;line-height:1.3;}
  .tip p{font-size:15px;line-height:2;color:#444;}

  /* ---------- print: value one-pager ---------- */
  @media print{
    .announce,.nav,.mobile-menu,.crumb,.contact,footer.site,.hero-bgword{display:none!important;}
    .page-head{padding:0 0 18px;}
    .page-head h1{font-size:26px;}
    .page-head .lead{font-size:12px;margin-top:8px;}
    .sec-label{font-size:9px;margin-bottom:8px;}
    .sec-title{font-size:19px;margin-bottom:14px;}
    .about-inner,.tips-inner,.steps-inner{padding:16px 0;}
    .cards3,.tips-grid{break-inside:avoid;}
    .cards3 .c,.tips-grid .tip,.step{padding:12px 14px;}
    .cards3 .c h4,.tip h3,.step h4{font-size:13px;margin-bottom:6px;}
    .cards3 .c p,.tip p,.step p{font-size:10.5px;line-height:1.65;}
    .cards3 .c .k,.tip .no,.step .dur{font-size:8px;margin-bottom:6px;}
    .step .n{font-size:22px;}
    .steps-row{break-inside:avoid;}
    section{break-inside:avoid-page;}
    body{font-size:11px;}
    .rv{opacity:1!important;transform:none!important;}
    .about-inner,.tips-inner,.steps-inner{padding:12px 0;}
    .about-inner .cards3,.about-inner .chain-row,.tips-inner .tips-grid,.steps-inner .steps-row{margin-top:22px;}
    section{margin-bottom:0!important;}
    body>:last-child{margin-bottom:0!important;}
    @page{size:A4;margin:12mm;}
  }

/* print compress pass 2 (final wins) */
@media print{
  .page-head{padding:0 0 10px;}
  .page-head h1{font-size:20px;}
  .page-head .lead{font-size:10px;margin-top:4px;line-height:1.55;}
  .sec-label{font-size:7.5px;margin-bottom:4px;}
  .sec-title{font-size:14px;margin-bottom:8px;}
  .about-inner,.tips-inner,.steps-inner{padding:6px 0;}
  .cards3 .c,.tips-grid .tip,.step{padding:7px 10px;}
  .cards3 .c h4,.tip h3,.step h4{font-size:10.5px;margin-bottom:3px;}
  .cards3 .c p,.tip p,.step p{font-size:9px;line-height:1.45;}
  .cards3 .c .k,.tip .no,.step .dur{font-size:7px;margin-bottom:3px;}
  .step .n{font-size:15px;}
  body{font-size:9.5px;}
  .about-inner .cards3,.about-inner .chain-row,.tips-inner .tips-grid,.steps-inner .steps-row{margin-top:10px;}
  .steps-inner .steps-note{margin-top:8px;font-size:9px;}
  @page{size:A4;margin:10mm;}
}

/* 定位段：园界是什么 */
.mist{background:var(--mist);}
.canon-quote{margin-top:52px;border-left:4px solid var(--red);padding:4px 0 4px 22px;font-size:19px;line-height:1.9;font-weight:700;max-width:42em;color:var(--ink);}
.canon-quote em{color:var(--red);font-style:normal;}
@media (max-width:1080px){.canon-quote{font-size:16px;margin-top:38px;}}
@media (max-width:640px){.canon-quote{font-size:14px;padding-left:14px;margin-top:28px;}}

/* ============ 主题切换 ============ */
:root{--accent:#ff0000;}
body[data-theme="gold"]{--red:#a86e08;--accent:#a86e08;}
body[data-theme="blue"]{--red:#1d4ed8;--accent:#1d4ed8;}
body[data-theme="green"]{--red:#0f8a5f;--accent:#0f8a5f;}
body[data-theme="cyan"]{--red:#0e7490;--accent:#0e7490;}
body[data-theme="violet"]{--red:#6d28d9;--accent:#6d28d9;}
body[data-theme="magenta"]{--red:#a21caf;--accent:#a21caf;}
/* 曜石黑：变量覆盖式深色主题 */
body[data-theme="blackgold"]{
  --paper:#0d0c0a;--mist:#161411;--ink:#f2ede0;--line:#2c2a24;--red:#d9a821;
  background:#0d0c0a;color:#f2ede0;
}
body[data-theme="redblack"]{
  --paper:#0c0a0a;--mist:#161111;--ink:#f2ecec;--line:#2a2323;--red:#e01313;
  background:#0c0a0a;color:#f2ecec;
}
body[data-theme="blueblack"]{
  --paper:#080b10;--mist:#0e131b;--ink:#ecf1f7;--line:#202936;--red:#2b7fff;
  background:#080b10;color:#ecf1f7;
}
body[data-theme="greenblack"]{
  --paper:#0a0c0a;--mist:#111611;--ink:#ecf2ec;--line:#232a23;--red:#17b26a;
  background:#0a0c0a;color:#ecf2ec;
}
body[data-theme="violetblack"]{
  --paper:#0c0a0e;--mist:#141118;--ink:#f1ecf4;--line:#272030;--red:#a855f7;
  background:#0c0a0e;color:#f1ecf4;
}
body[data-theme="blackgold"],body[data-theme="redblack"],body[data-theme="blueblack"],body[data-theme="greenblack"],body[data-theme="violetblack"] *{border-color:#3a3a3a!important;}
body.dk .canon-quote{border-left-color:var(--red)!important;}
body.dk .sec-desc,body.dk .cards3 .c p,body.dk .tip p,
body.dk .pain-item p,body.dk .ai-step p,body.dk .step p,
body.dk .mode p,body.dk .faq-a p,body.dk .mobile-menu .mg-l a,
body.dk .page-head .lead,body.dk .lead{color:#c9c9c9!important;}
body.dk .hero-valuejump,body.dk .chain-row .lab,
body.dk .ai-flow .sub,body.dk .crumb a,
body.dk .foot-bottom span{color:#8a8a8a!important;}
body.dk .five .f p,body.dk .crumb span{color:#999!important;}
body.dk .foot-grid .fw p{color:#a8a8a8!important;}
body.dk .foot-grid .fw h6{color:#999!important;}
body.dk .foot-grid .fw a{color:#d8d8d8!important;}
body.dk .case-main p,body.dk .mode:last-child p,
body.dk .mode:last-child li{color:#d5d5d5!important;}
body.dk .case-side .it p{color:#a8a8a8!important;}
body.dk .duo .d li{color:#d5d5d5!important;}
body.dk .imgfig figcaption{color:#8a8a8a!important;}
body.dk .hero-sub{color:#c9c9c9!important;}
body.dk .hero-trust .t{color:#999!important;}
body.dk .step .n{color:rgba(255,255,255,.16)!important;}
body.dk .hero-bgword{color:rgba(255,255,255,.05)!important;}
body.dk .mode li{color:#d5d5d5!important;}


/* 浅色系主题：深面板（--inv）上的 accent 小标签/强调字掺白提亮，保证对深底对比度 */
body:not(.dk) .case .k,body:not(.dk) .case .sec-title em,body:not(.dk) .case-side .it .k,
body:not(.dk) .mode:last-child .k,body:not(.dk) .pain-hook em{
  color:color-mix(in srgb,var(--red) 60%,#fff)!important;
}

/* 红黑：亮红底上的正文恢复纯白（body.dk sweep 的 #c9c9c9 在红底上对比不足） */
body[data-theme="redblack"] .step:last-child,
body[data-theme="redblack"] .step:last-child p,
body[data-theme="redblack"] .step:last-child .lead,
body[data-theme="redblack"] .contact .lead,
body[data-theme="redblack"] .contact .hint,
body[data-theme="redblack"] .contact p,
body[data-theme="redblack"] .contact h2,
body[data-theme="redblack"] .contact h3,
body[data-theme="redblack"] .contact h4,
body[data-theme="redblack"] .interlude,
body[data-theme="redblack"] .interlude *,
body[data-theme="redblack"] .screen-banner,
body[data-theme="redblack"] .screen-banner *,
body[data-theme="redblack"] .split-old,
body[data-theme="redblack"] .split-old p{color:#fff!important;}

/* 浮动开关 */
.theme-dd{position:relative;user-select:none;}
.theme-dd-btn{
  display:flex;align-items:center;gap:8px;background:none;border:1.5px solid var(--ink);
  color:var(--ink);font-family:var(--zh);font-size:13px;letter-spacing:.1em;font-weight:700;
  padding:9px 14px;cursor:pointer;white-space:nowrap;transition:all .25s var(--ease);
}
.theme-dd-btn::after{content:"";width:7px;height:7px;border-right:1.5px solid currentColor;border-bottom:1.5px solid currentColor;transform:rotate(45deg);margin-top:-3px;transition:transform .25s var(--ease);}
.theme-dd.open .theme-dd-btn{background:var(--ink);color:var(--paper);}
.theme-dd.open .theme-dd-btn::after{transform:rotate(225deg);margin-top:2px;}
.theme-dd-list{
  display:none;position:absolute;right:0;top:calc(100% + 6px);z-index:300;min-width:150px;
  background:var(--paper);border:1.5px solid var(--ink);box-shadow:6px 6px 0 rgba(0,0,0,.15);
  max-height:60vh;overflow-y:auto;
}
.theme-dd.open .theme-dd-list{display:block;}
.theme-dd-list button{
  display:flex;align-items:center;gap:10px;width:100%;text-align:left;background:none;border:none;
  border-top:1px solid var(--line);padding:11px 16px;font-family:var(--zh);font-size:13px;
  letter-spacing:.1em;color:var(--ink);cursor:pointer;transition:background .2s var(--ease);
}
.theme-dd-list button:first-child{border-top:none;}
.theme-dd-list button:hover{background:var(--mist);}
.theme-dd-list button i{width:11px;height:11px;border:1.5px solid var(--ink);flex:none;}
.theme-dd-list button.on{font-weight:900;}
.theme-dd-list button.on i{background:var(--red);border-color:var(--red);}
.theme-dd-list button[data-set="red"] i{background:#ff0000;}
.theme-dd-list button[data-set="gold"] i{background:#c98a12;}
.theme-dd-list button[data-set="blue"] i{background:#1d4ed8;}
.theme-dd-list button[data-set="green"] i{background:#0f8a5f;}
.theme-dd-list button[data-set="cyan"] i{background:#0e7490;}
.theme-dd-list button[data-set="violet"] i{background:#6d28d9;}
.theme-dd-list button[data-set="magenta"] i{background:#a21caf;}
.theme-dd-list button[data-set="blackgold"] i{background:linear-gradient(135deg,#d9a821 50%,#121212 50%);}
.theme-dd-list button[data-set="redblack"] i{background:linear-gradient(135deg,#e01313 50%,#121212 50%);}
.theme-dd-list button[data-set="blueblack"] i{background:linear-gradient(135deg,#2b7fff 50%,#121212 50%);}
.theme-dd-list button[data-set="greenblack"] i{background:linear-gradient(135deg,#17b26a 50%,#121212 50%);}
.theme-dd-list button[data-set="violetblack"] i{background:linear-gradient(135deg,#a855f7 50%,#121212 50%);}
@media(max-width:900px){.nav .theme-dd{display:none;}}
.theme-dd-mobile{display:none;margin:0 6vw 18px;}
@media(max-width:900px){.theme-dd-mobile{display:block;}}
.theme-dd-mobile .theme-dd-btn{width:100%;justify-content:space-between;padding:13px 16px;}
.theme-dd-mobile .theme-dd-list{left:0;right:0;position:static;margin-top:6px;box-shadow:4px 4px 0 rgba(0,0,0,.12);}
@media print{.theme-dd{display:none!important;}}

/* 配图 */
.imgband{position:relative;border-top:1px solid var(--line);border-bottom:1px solid var(--line);overflow:hidden;}
.imgband img{display:block;width:100%;height:clamp(280px,48vh,520px);object-fit:cover;}
.imgband .tag{position:absolute;left:6vw;bottom:16px;background:var(--red);color:#fff;font-size:12px;letter-spacing:.14em;padding:7px 16px;font-weight:700;}
.imgfig{margin-top:56px;border:1px solid var(--line);}
.imgfig img{display:block;width:100%;height:auto;}
.imgfig figcaption{display:flex;align-items:center;gap:10px;padding:13px 18px;font-size:13px;letter-spacing:.08em;color:#666;border-top:1px solid var(--line);background:var(--paper);}
.imgfig figcaption::before{content:"";width:9px;height:9px;background:var(--red);flex:none;}
@media (max-width:640px){.imgband img{height:240px;}.imgfig{margin-top:32px;}}


/* 深色主题：hero 区深色底上的浅字补漏 */

/* 深字主题：亮彩底（金/蓝/绿/紫）上一律用深字，保证对比度（白字对比度仅2.2-3.0） */
body[data-theme="gold"] .cta-btn,
body[data-theme="gold"] .btn.primary,
body[data-theme="gold"] .split-old,
body[data-theme="gold"] .chain-row .node.hot,
body[data-theme="gold"] .cell-new.hot,
body[data-theme="gold"] .cell.hot h3,
body[data-theme="gold"] .interlude,
body[data-theme="gold"] .screen-banner,
body[data-theme="gold"] .step:last-child,
body[data-theme="gold"] .contact,
body[data-theme="gold"] .teaser-grid a:hover,
body[data-theme="gold"] .imgband .tag,
body[data-theme="gold"] .pain-hook .btn:hover,
body[data-theme="blackgold"] .cta-btn,
body[data-theme="blackgold"] .btn.primary,
body[data-theme="blackgold"] .split-old,
body[data-theme="blackgold"] .chain-row .node.hot,
body[data-theme="blackgold"] .cell-new.hot,
body[data-theme="blackgold"] .cell.hot h3,
body[data-theme="blackgold"] .interlude,
body[data-theme="blackgold"] .screen-banner,
body[data-theme="blackgold"] .step:last-child,
body[data-theme="blackgold"] .contact,
body[data-theme="blackgold"] .teaser-grid a:hover,
body[data-theme="blackgold"] .imgband .tag,
body[data-theme="blackgold"] .pain-hook .btn:hover,
body[data-theme="blueblack"] .cta-btn,
body[data-theme="blueblack"] .btn.primary,
body[data-theme="blueblack"] .split-old,
body[data-theme="blueblack"] .chain-row .node.hot,
body[data-theme="blueblack"] .cell-new.hot,
body[data-theme="blueblack"] .cell.hot h3,
body[data-theme="blueblack"] .interlude,
body[data-theme="blueblack"] .screen-banner,
body[data-theme="blueblack"] .step:last-child,
body[data-theme="blueblack"] .contact,
body[data-theme="blueblack"] .teaser-grid a:hover,
body[data-theme="blueblack"] .imgband .tag,
body[data-theme="blueblack"] .pain-hook .btn:hover,
body[data-theme="greenblack"] .cta-btn,
body[data-theme="greenblack"] .btn.primary,
body[data-theme="greenblack"] .split-old,
body[data-theme="greenblack"] .chain-row .node.hot,
body[data-theme="greenblack"] .cell-new.hot,
body[data-theme="greenblack"] .cell.hot h3,
body[data-theme="greenblack"] .interlude,
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