@font-face{font-family:"Sora";font-style:normal;font-weight:400 800;font-display:swap;src:url(/assets/fonts/sora-latin.woff2) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
:root{
  --paper:#EDF1EF; --paper2:#F6F8F7; --ink:#0E2F36; --ink2:#3F5A5F; --mute:#7C9095;
  --line:#CBD6D3; --engr:#2A6B74; --rust:#A34A24; --amber:#F4E3C1;
  --foil:linear-gradient(180deg,#b9dcd3 0%,#e7d2ef 28%,#f4e1b6 52%,#bfe1f1 76%,#d6e9cf 100%);
  /* engine-turned lattice: interlocking circles */
  --lattice:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 14 14'%3E%3Cg fill='none' stroke='%232A6B74' stroke-width='.55' stroke-opacity='.55'%3E%3Ccircle cx='0' cy='0' r='7'/%3E%3Ccircle cx='14' cy='0' r='7'/%3E%3Ccircle cx='0' cy='14' r='7'/%3E%3Ccircle cx='14' cy='14' r='7'/%3E%3Ccircle cx='7' cy='7' r='7'/%3E%3C/g%3E%3C/svg%3E");
  --lattice-f:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='10' viewBox='0 0 10 10'%3E%3Cg fill='none' stroke='%232A6B74' stroke-width='.45' stroke-opacity='.32'%3E%3Ccircle cx='0' cy='0' r='5'/%3E%3Ccircle cx='10' cy='0' r='5'/%3E%3Ccircle cx='0' cy='10' r='5'/%3E%3Ccircle cx='10' cy='10' r='5'/%3E%3Ccircle cx='5' cy='5' r='5'/%3E%3C/g%3E%3C/svg%3E");
  --hair:repeating-linear-gradient(0deg,rgba(42,107,116,.075) 0 1px,transparent 1px 3px);
  --fade-r:linear-gradient(90deg,#000 70%,transparent);
  --fade-l:linear-gradient(270deg,#000 70%,transparent);
  --cjk:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",sans-serif;
}
*{box-sizing:border-box}
html,body{margin:0}
body{background:var(--paper);color:var(--ink);font:16px/1.7 var(--cjk);-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
.lat{font-family:Sora,var(--cjk)}
.nw{white-space:nowrap}
.sr{position:absolute!important;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.mo{display:none}

/* ---------- top bar ---------- */
.top{border-bottom:1px solid var(--line)}
.top-in{display:flex;align-items:center;gap:36px;max-width:1440px;margin:0 auto;padding:11px 32px 10px}
.brand{display:flex;align-items:center;gap:10px;font-family:Sora,sans-serif;font-weight:800;letter-spacing:.32em;font-size:17px;line-height:1}
.brand svg{width:28px;height:28px;flex:none}
.nav{display:flex;gap:26px;font-size:15px;color:var(--ink2)}
.nav a{padding:4px 0;border-bottom:1.5px solid transparent;white-space:nowrap}
.nav a.on{color:var(--ink);border-color:var(--ink)}
.nav a:hover{color:var(--ink)}
.find{margin-left:auto;display:flex;align-items:center;gap:8px;border:1px solid var(--line);background:var(--paper2);border-radius:999px;padding:0 14px;width:230px;height:36px;color:var(--mute)}
.find input{border:0;background:none;outline:0;font:14px/1 var(--cjk);color:var(--ink);width:100%;min-width:0}
.find input::placeholder{color:var(--ink2)}
.find:focus-within{border-color:var(--engr)}

/* ---------- the certificate board ---------- */
.hero{max-width:1440px;margin:0 auto;padding:16px 32px 0}
.board{position:relative;display:grid;grid-template-columns:minmax(0,.88fr) minmax(0,.98fr) minmax(0,1.56fr);grid-template-rows:auto auto;gap:10px;padding:14px;
  border:1.5px solid var(--ink);
  background:var(--lattice),#E3EAE7;
  box-shadow:inset 0 0 0 3px var(--paper),inset 0 0 0 4px var(--engr),0 28px 50px -34px rgba(14,47,54,.45),0 2px 5px rgba(14,47,54,.06)}
.cell{position:relative;min-width:0;display:flex;flex-direction:column;background:var(--paper2);
  border:1px solid rgba(14,47,54,.55);
  box-shadow:inset 0 0 0 3px var(--paper2),inset 0 0 0 4px rgba(42,107,116,.38)}
.c-intro{grid-area:1/1}
.c-code{grid-area:1/2}
.c-map{grid-area:1/3}
.c-read{grid-area:2/1/3/3}
.c-sos{grid-area:2/3}

/* medallions: corners and gutter junctions */
.med{position:absolute;z-index:3;width:24px;height:24px;border-radius:50%;background:var(--paper2);color:var(--engr);
  box-shadow:0 0 0 1px var(--ink),0 0 0 3px var(--paper2),0 0 0 3.7px var(--engr)}
.med svg{width:100%;height:100%;display:block}
.med.k1{left:-5px;top:-5px}.med.k2{right:-5px;top:-5px}.med.k3{left:-5px;bottom:-5px}.med.k4{right:-5px;bottom:-5px}
.med.j1,.med.j2{position:relative;align-self:start;justify-self:start;margin:-17px 0 0 -17px}
.med.j1{grid-area:2/2}.med.j2{grid-area:2/3}

/* engraved caption band on each cell */
.band{position:relative;display:flex;align-items:center;gap:10px;height:32px;margin:5px 5px 0;padding:0 10px;flex:none;
  background:var(--hair),#E8EEEB;border-bottom:1px solid rgba(42,107,116,.5)}
.band::after{content:"";position:absolute;left:0;right:0;bottom:-4px;border-bottom:.8px solid rgba(42,107,116,.4)}
.band .no{flex:none;width:22px;height:22px;padding:1px;border-radius:50%;color:var(--engr);border:1px solid currentColor;
  box-shadow:0 0 0 2px #E8EEEB,0 0 0 2.6px rgba(42,107,116,.5);background:#EEF3F1}
.band .no svg{display:block;width:100%;height:100%}
/* microprint: drawn by CSS, so the words never enter the page text */
.mk,.micro{display:flex;height:8px;overflow:hidden;white-space:nowrap;font:600 6.5px/8px Sora,sans-serif;letter-spacing:.3em;color:var(--engr)}
.mk::before,.micro::before{content:var(--mk,"");flex:none}
.k-reg{--mk:"REGISTRATION GUIDE · READ FIRST · DUIUO · REGISTRATION GUIDE · READ FIRST · DUIUO · REGISTRATION GUIDE · READ FIRST · DUIUO · REGISTRATION GUIDE · READ FIRST · DUIUO"}
.k-sos{--mk:"DISPUTE · APPEAL · FROZEN CARD · DISPUTE · APPEAL · FROZEN CARD · DISPUTE · APPEAL · FROZEN CARD · DISPUTE · APPEAL · FROZEN CARD · DISPUTE · APPEAL · FROZEN CARD"}
.k-rail{--mk:"RMB · USDT · C2C · DUIUO · RMB · USDT · C2C · DUIUO · RMB · USDT · C2C · DUIUO · RMB · USDT · C2C · DUIUO · RMB · USDT · C2C · DUIUO · RMB · USDT · C2C · DUIUO · RMB · USDT · C2C · DUIUO · RMB · USDT · C2C · DUIUO · RMB · USDT · C2C · DUIUO · RMB · USDT · C2C · DUIUO"}
.k-map{--mk:"C2C · ESCROW · RMB ⇄ USDT · C2C · ESCROW · RMB ⇄ USDT · C2C · ESCROW · RMB ⇄ USDT · C2C · ESCROW · RMB ⇄ USDT · C2C · ESCROW · RMB ⇄ USDT"}
.k-ref{--mk:"DUIUO · REFERRAL CODE · DUIUO · REFERRAL CODE · DUIUO · REFERRAL CODE · DUIUO · REFERRAL CODE · DUIUO · REFERRAL CODE · DUIUO · REFERRAL CODE"}
.k-enter{--mk:"ENTER AT SIGN-UP ONLY · DUIUO · ENTER AT SIGN-UP ONLY · DUIUO · ENTER AT SIGN-UP ONLY · DUIUO · ENTER AT SIGN-UP ONLY · DUIUO"}
.band .mk{flex:1;min-width:0;opacity:.62;-webkit-mask-image:var(--fade-r);mask-image:var(--fade-r)}
.band .mk.r{justify-content:flex-end;-webkit-mask-image:var(--fade-l);mask-image:var(--fade-l)}
.band .bt{flex:none;margin:0;font-size:13px;line-height:1;letter-spacing:.16em;font-weight:600;color:var(--ink)}
/* narrow cells: no microprint, a double engraved rule either side of the title */
.band.plain .bt{flex:1;min-width:0;display:flex;align-items:center;gap:12px;white-space:nowrap}
.band.plain .bt::before,.band.plain .bt::after{content:"";flex:1;min-width:8px;height:3.8px;border-top:1px solid rgba(42,107,116,.5);border-bottom:.8px solid rgba(42,107,116,.5)}
.band.alarm .bt{color:var(--rust)}
.band.alarm .no{color:var(--rust);box-shadow:0 0 0 2px #E8EEEB,0 0 0 2.6px rgba(181,83,42,.5)}
.bd{position:relative;flex:1;display:flex;flex-direction:column;min-height:0}

/* ① intro */
.c-intro{overflow:hidden}
.c-intro .bd{padding:30px 24px 22px}
h1{position:relative;font-size:clamp(28px,2.4vw,34px);line-height:1.34;margin:0 0 18px;font-weight:800;letter-spacing:.01em}
h1 em{font-style:normal;padding-bottom:5px;background:url(/assets/img/rope.svg) left bottom/380px 9px repeat-x}
.lede{position:relative;font-size:16px;line-height:1.8;color:var(--ink2);margin:0 0 24px;text-wrap:pretty}
.rope{display:block;width:100%;height:18px;margin:auto 0 0;flex:none;object-fit:cover;object-position:left center;opacity:.6}
.creed{position:relative;margin:auto 0 0;padding:22px 0 0}
.creed p{margin:0;padding:12px 0 0;font-size:13.5px;line-height:1.75;color:var(--ink2);text-wrap:pretty}
.creed p:first-child{padding-top:0}
.creed p+p{margin-top:12px;border-top:1px dotted #aebfbb}
.creed b{display:block;font-size:13px;letter-spacing:.18em;color:var(--engr);font-weight:600;margin-bottom:2px}

/* ② code ticket */
.c-code .bd{padding:18px}
.note{position:relative;flex:1;display:flex;flex-direction:column;border-radius:10px;background:var(--paper2);overflow:hidden;border:1px solid #c5d2cf;
  box-shadow:0 1px 0 rgba(14,47,54,.12)}
.note::before{content:"";position:absolute;inset:5px;z-index:1;pointer-events:none;border:1px solid rgba(42,107,116,.3);border-radius:6px}
.note .rose{position:absolute;z-index:0;width:250px;height:250px;right:-35px;top:12px;opacity:.6}
.note::after{content:"";position:absolute;inset:0;z-index:0;pointer-events:none;
  background:linear-gradient(90deg,rgba(246,248,247,.95) 0%,rgba(246,248,247,.86) 40%,rgba(246,248,247,.25) 66%,rgba(246,248,247,0) 80%)}
.note .foil{position:absolute;z-index:1;top:0;bottom:0;right:18px;width:10px;background:var(--foil);opacity:.9;box-shadow:0 0 0 1px rgba(255,255,255,.6) inset}
.note .micro{position:absolute;z-index:1;left:16px;right:34px;opacity:.65;-webkit-mask-image:var(--fade-r);mask-image:var(--fade-r)}
.note .micro.t{top:10px}.note .micro.b{bottom:9px}
.note .inner{position:relative;z-index:2;flex:1;display:flex;flex-direction:column;align-items:flex-start;padding:38px 44px 28px 24px}
.lab{font:600 13px/1.4 Sora,var(--cjk);color:var(--engr);letter-spacing:.14em}
.code{margin:12px 0 20px;line-height:1;white-space:nowrap}
.code strong{font-family:Sora,sans-serif;font-weight:700;font-size:clamp(30px,2.75vw,40px);letter-spacing:.1em;color:var(--ink);text-shadow:0 1px 0 #fff,0 -1px 0 rgba(14,47,54,.18);-webkit-user-select:all;user-select:all}
.copy{appearance:none;border:0;cursor:pointer;display:inline-flex;align-items:center;gap:8px;background:var(--ink);color:#fff;font:600 15px/1 var(--cjk);padding:0 20px;height:44px;border-radius:9px;white-space:nowrap;
  box-shadow:inset 0 0 0 3px var(--ink),inset 0 0 0 4px rgba(159,198,201,.45)}
.copy:hover{background:#163f48;box-shadow:inset 0 0 0 3px #163f48,inset 0 0 0 4px rgba(159,198,201,.55)}
.copy:focus-visible{outline:2px solid var(--engr);outline-offset:3px}
.copy.done{background:var(--engr);box-shadow:inset 0 0 0 3px var(--engr),inset 0 0 0 4px rgba(255,255,255,.4)}
.copy.fail{text-wrap:balance;max-width:100%;height:auto;min-height:44px;padding:9px 16px;white-space:normal;line-height:1.45;text-align:left;background:var(--rust);box-shadow:inset 0 0 0 3px var(--rust),inset 0 0 0 4px rgba(255,255,255,.4)}
.copy svg{width:15px;height:15px;flex:none}
.benefit{font-size:16px;line-height:1.6;margin:20px 0 8px;color:var(--ink)}
.benefit b{color:var(--rust);font-weight:700}
.benefit b .lat{font-weight:700}
.fine{font-size:13px;line-height:1.65;color:var(--ink2);margin:0 0 14px;max-width:22em;text-wrap:pretty;
  background:rgba(246,248,247,.9);box-shadow:0 0 6px 6px rgba(246,248,247,.9);border-radius:2px}
.wv{flex:none;align-self:stretch;height:52px;overflow:hidden;margin:auto -14px 0 -18px;order:3}
.wv svg,.wv img{display:block;width:100%;height:52px;opacity:.42;object-fit:cover;object-position:left center}
.how{align-self:stretch;margin-top:26px;padding-top:0}
.how-h{display:flex;align-items:center;gap:10px;margin:0 0 9px;font:600 13px/1.4 Sora,var(--cjk);letter-spacing:.14em;color:var(--engr)}
.how-h::after{content:"";flex:1;height:3.8px;border-top:1px solid rgba(42,107,116,.4);border-bottom:.8px solid rgba(42,107,116,.4)}
.howto{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:8px;font-size:13.5px;line-height:1.55;color:var(--ink2)}
.howto li{display:flex;align-items:flex-start;gap:10px}
.howto li i{flex:none;width:22px;height:22px;margin-top:-1px;border-radius:50%;background:var(--paper2);border:1px solid var(--engr);
  box-shadow:0 0 0 2px var(--paper2),0 0 0 2.6px rgba(42,107,116,.45);font:700 13px/20px Sora,sans-serif;font-style:normal;text-align:center;color:var(--engr)}
.howto li span{padding-top:1px}
.howto-m{display:none}

/* ③ C2C map */
.c-map .bd{padding:16px 22px 12px}
.map-h{display:flex;align-items:center;justify-content:space-between;gap:10px 14px;flex-wrap:wrap}
.map-h h2{font-size:18px;line-height:1.4;margin:0;font-weight:800;letter-spacing:.01em}
.tg{display:inline-flex;flex:none;border:1px solid var(--ink);border-radius:999px;padding:2px;background:var(--paper)}
.tg button{appearance:none;border:0;background:none;cursor:pointer;font:600 14px/1 var(--cjk);color:var(--ink2);padding:0 15px;height:30px;border-radius:999px}
.tg button[aria-pressed="true"]{background:var(--ink);color:#fff}
.tg button:focus-visible{outline:2px solid var(--engr);outline-offset:2px}
.panes{display:grid;margin-top:14px}
.pane{grid-area:1/1;--lw:184px}
.pane[hidden]{display:block;visibility:hidden}
.pane-h{display:none;align-items:center;gap:10px;margin:14px 0 6px;font-size:15px;font-weight:800}
.pane-h::after{content:"";flex:1;border-top:1px solid var(--line)}

.lh{display:grid;grid-template-columns:minmax(0,1fr) var(--lw);align-items:stretch;border-top:1.5px solid var(--ink);border-bottom:1px solid var(--ink)}
.lh-t{display:flex;align-items:center;flex-wrap:wrap;gap:2px 0;padding:6px 10px 6px 0;font-size:13px;line-height:1.5;color:var(--ink2)}
.lh-t .lg{display:inline-flex;align-items:center;gap:5px;margin-right:12px;color:var(--ink)}
.lh-t .lg .ck{position:relative;left:auto;top:auto;margin:0;width:26px;height:26px}
.lh-t .lg .ck b{font-size:13px}
.lh-t .arcmini{display:block;flex:none;width:24px;height:12px;color:var(--ink2);margin:0 1px 0 0;overflow:visible}
.lh-l{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));text-align:center}
.lh-l b{font-weight:700}
.lh-l span{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:5px 2px;font-size:14px;font-weight:700;line-height:1.3;color:var(--ink)}
.lh-l span+span{border-left:1px solid var(--line)}
.lh-l span small{font-size:13px;font-weight:400;color:var(--ink2);margin-top:1px}
.lh-l span.esc{background:var(--lattice-f),rgba(42,107,116,.07)}
.lh-l span.esc small{background:var(--paper2);padding:0 4px;border-radius:2px}

.steps{list-style:none;margin:0;padding:0}
.st{position:relative;display:grid;grid-template-columns:minmax(0,1fr) var(--lw)}
.st+.st{border-top:1px dotted #aebfbb}
.st>.tx{grid-area:1/1}
.st>.ln{grid-area:1/2}
.st::before{content:"";position:absolute;z-index:1;left:16px;top:0;bottom:0;border-left:1px solid rgba(42,107,116,.55)}
.st:first-child::before{top:22px}
.st:last-child::before{bottom:auto;height:22px}
.tx{position:relative;padding:10px 10px 9px 40px;font-size:13.5px;line-height:1.6;color:var(--ink2);text-wrap:pretty}
.tx .n{position:absolute;z-index:2;left:3px;top:9px;width:27px;height:27px;border-radius:50%;background:var(--paper2);border:1px solid var(--engr);
  box-shadow:0 0 0 2px var(--paper2),0 0 0 2.6px rgba(42,107,116,.45);font:700 13px/25px Sora,sans-serif;text-align:center;color:var(--engr)}
.tx b.t{color:var(--ink);font-weight:700;font-size:14.5px;margin-right:6px}
.st.risk .tx{background:linear-gradient(90deg,rgba(244,227,193,.95),rgba(244,227,193,.6))}
.st.risk .tx .n{border-color:var(--rust);color:var(--rust);box-shadow:0 0 0 2px #F4E3C1,0 0 0 2.6px rgba(181,83,42,.55);background:#FBF3E3}
.rk{display:block;margin-top:5px;color:var(--ink)}
.rk .tag{display:inline-block;font-size:13px;line-height:1;padding:4px 7px 3px;margin-right:7px;border:1px solid var(--rust);border-radius:2px;background:var(--rust);color:#fff;font-weight:700;letter-spacing:.04em;vertical-align:1px}
.fork{display:block;position:relative;margin:6px 0 1px;padding:3px 10px 4px;border:1px dashed rgba(14,47,54,.42);border-radius:3px;background:rgba(246,248,247,.92);font-size:13px;line-height:1.6;color:var(--ink)}
.fork::before{content:"";position:absolute;left:-24px;top:14px;width:23px;border-top:1px dashed var(--ink2)}
.fork::after{content:"";position:absolute;left:-27px;top:11px;width:7px;height:7px;border-radius:50%;background:var(--ink2);box-shadow:0 0 0 2px var(--paper2)}
.fork .bk{display:inline-block;font-size:13px;line-height:1;padding:3px 5px;margin-right:7px;border-radius:2px;background:var(--ink);color:#fff;vertical-align:1px}
.fork b{font-weight:700}
.fork a{color:var(--engr);border-bottom:1px solid rgba(42,107,116,.45)}
.fork a:hover{color:var(--ink)}

/* lanes */
.ln{position:relative;min-height:56px;
  background:linear-gradient(var(--line),var(--line)) 33.333% 0/1px 100% no-repeat,linear-gradient(var(--line),var(--line)) 66.667% 0/1px 100% no-repeat}
.ln::before{content:"";position:absolute;top:0;bottom:0;left:33.333%;width:33.333%;background:var(--lattice-f),rgba(42,107,116,.07)}
.ln::after{content:"";position:absolute;top:0;bottom:0;left:0;right:0;pointer-events:none;
  background:linear-gradient(rgba(42,107,116,.2),rgba(42,107,116,.2)) 16.667% 0/1px 100% no-repeat,linear-gradient(rgba(42,107,116,.2),rgba(42,107,116,.2)) 50% 0/1px 100% no-repeat,linear-gradient(rgba(42,107,116,.2),rgba(42,107,116,.2)) 83.333% 0/1px 100% no-repeat}
.ln.tall{min-height:76px}
.ln.tall2{min-height:92px}
.st.risk .ln{background-color:rgba(244,227,193,.55)}
.st.risk .ln::before{background:var(--lattice-f),rgba(244,227,193,.55)}
.ck,.gh{position:absolute;top:21px;left:calc((var(--l) * 2 - 1) * 100% / 6);width:30px;height:30px;margin-left:-15px;z-index:2}
.ck{display:grid;place-items:center}
.ck svg{position:absolute;inset:0;width:100%;height:100%}
.ck b{position:relative;font:700 13px/1 Sora,var(--cjk)}
.ck.y b{color:var(--rust)}
.ck.u b{color:var(--engr)}
.ck.pend svg{opacity:.5}
.ck.pend::before{content:"";position:absolute;inset:-4px;border:1.2px dashed var(--rust);border-radius:50%}
.cap{position:absolute;top:34px;left:50%;transform:translateX(-50%);font:600 13px/1.25 var(--cjk);white-space:nowrap;text-align:center;padding:1px 4px;background:var(--paper2);border-radius:2px}
.ck.y .cap,.gh.y .cap{color:var(--rust)}
.ck.u .cap{color:var(--engr);font-family:Sora,var(--cjk)}
.st.risk .cap{background:#FBF1DE}
.ck .lk{position:absolute;right:-7px;bottom:-5px;width:17px;height:17px;border-radius:50%;background:var(--ink);display:grid;place-items:center;box-shadow:0 0 0 1.5px var(--paper2)}
.ck .lk svg{position:static;width:10px;height:10px}
.ck .ok{position:absolute;right:-7px;bottom:-5px;width:17px;height:17px;border-radius:50%;background:var(--engr);display:grid;place-items:center;box-shadow:0 0 0 1.5px var(--paper2)}
.ck .ok svg{position:static;width:12px;height:12px}
.ck.y .cap.ck-ok{color:var(--ink)}
.gh{border:1.2px dashed currentColor;border-radius:50%;background:rgba(246,248,247,.6)}
.gh.y{color:rgba(181,83,42,.65)}.gh.u{color:rgba(42,107,116,.65)}
.gh.y .cap{color:var(--rust)}
.arc{position:absolute;top:3px;height:12px;border:2px dashed currentColor;border-bottom:0;border-radius:50% 50% 0 0/100% 100% 0 0;z-index:3}
.arc.y{color:var(--rust)}.arc.u{color:var(--engr)}
.arc::after{content:"";position:absolute;bottom:-7px;border:5px solid transparent;border-top:7px solid currentColor;border-bottom:0}
.arc.tr::after{right:-6.5px}.arc.tl::after{left:-6.5px}
.arc.pend{opacity:.5}
.a12{left:16.667%;width:33.333%}
.a13{left:16.667%;width:66.667%;top:1px;height:15px}
.a23{left:50%;width:33.333%}
.src{margin:auto 0 0;padding-top:10px;text-align:right;font-size:13px;line-height:1.4;color:var(--ink2)}
.src i{font-style:normal;display:inline-block;width:18px;border-top:1px solid var(--ink2);vertical-align:4px;margin-right:7px}

/* ④ read strip */
.read{position:relative;flex:1;display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:24px;align-items:center;margin:9px 5px 5px;padding:10px 26px 10px 22px;
  background:var(--ink);color:#E8F0EE;overflow:hidden;
  box-shadow:inset 0 0 0 4px var(--ink),inset 0 0 0 5px rgba(159,198,201,.32)}
.read img.rg{position:absolute;right:-30px;top:50%;width:330px;height:330px;margin-top:-165px;opacity:.5;pointer-events:none}
.read::after{content:"";position:absolute;inset:0;pointer-events:none;background:linear-gradient(90deg,var(--ink) 0%,var(--ink) 55%,rgba(14,47,54,.35) 100%)}
.read>span{position:relative;z-index:1}
.read .tag{font-size:13px;letter-spacing:.14em;color:#9FC6C9;writing-mode:vertical-rl;border-left:1px solid #2f5a61;padding-left:12px;line-height:1.2}
.read b{display:block;font-size:20px;line-height:1.45;color:#fff;font-weight:700;text-wrap:balance}
.howto li>span{text-wrap:balance}
.fld input::placeholder{font-weight:400;color:#9AABAE}
.read small{display:block;font-size:14px;line-height:1.6;color:#A9C2C3;margin-top:3px}
.read .go{display:grid;place-items:center;width:46px;height:46px;border-radius:50%;border:1px solid rgba(244,227,193,.7);box-shadow:0 0 0 3px var(--ink),0 0 0 3.8px rgba(244,227,193,.3);font:400 22px/1 Sora,sans-serif;color:var(--amber);transition:transform .2s}
.read:hover .go{transform:translateX(3px)}
.read:hover b{text-decoration:underline;text-underline-offset:4px;text-decoration-thickness:1px}

/* ⑤ sos */
.c-sos ul{list-style:none;margin:0;padding:4px 20px 4px}
.c-sos li+li{border-top:1px dotted #aebfbb}
.c-sos a{display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:0 14px;padding:4px 2px;font-size:15px;line-height:1.6;color:var(--ink)}
.c-sos a .h{font-size:13px;line-height:1.6;color:var(--ink2);text-align:right}
.c-sos a i{font:400 16px/1 Sora,sans-serif;font-style:normal;color:var(--engr);transition:transform .2s}
.c-sos a:hover>span:first-child{color:var(--engr)}
.sos-edge{display:block;margin:0 20px 10px;padding:8px 2px 0;border-top:1px dotted #aebfbb;font-size:13.5px;line-height:1.7;color:var(--ink2)}
.c-sos a:hover i{transform:translateX(3px)}

/* ---------- below the fold: stages ---------- */
.stages{max-width:1440px;margin:0 auto;padding:56px 32px 30px}
.st-head{display:flex;align-items:center;gap:16px;margin:0 0 16px}
.st-head h2{font-size:20px;margin:0;font-weight:800;letter-spacing:.02em;white-space:nowrap}
.st-head .mk{flex:1;min-width:0;opacity:.6;-webkit-mask-image:var(--fade-r);mask-image:var(--fade-r)}
.st-head .all{font-size:14px;color:var(--ink2);white-space:nowrap}
.st-head .all:hover{color:var(--ink)}
.rail{display:grid;grid-template-columns:1.3fr 1.05fr 1.55fr 1.3fr 1.1fr 1.55fr 1.05fr;border-top:2px solid var(--ink);position:relative}
.rail::before{content:"";position:absolute;left:0;right:0;top:3px;border-top:.8px solid var(--engr);opacity:.6}
.sg{padding:18px 16px 6px 0;border-right:1px solid var(--line);margin-right:16px;min-width:0}
.sg:last-child{border-right:0;margin-right:0}
.sg .n{display:grid;place-items:center;width:28px;height:28px;border-radius:50%;border:1px solid var(--engr);background:var(--paper2);box-shadow:0 0 0 2px var(--paper),0 0 0 2.6px rgba(42,107,116,.4);font:700 12px/1 Sora,sans-serif;color:var(--engr)}
.sg.warn .n{border-color:var(--rust);color:var(--rust)}
.sg .gl{margin:-6px 0 12px;font-size:13px;line-height:1.6;color:var(--ink2);text-wrap:pretty}
.sg>b{display:block;font-size:17px;margin:10px 0 12px}
.sg.warn>b{color:var(--rust)}
.sg a{display:block;margin:0 0 13px;font-size:14px;line-height:1.6;color:var(--ink)}
.sg a{text-wrap:balance}
.sg a small{display:block;font-size:13px;line-height:1.6;color:var(--ink2);margin-top:2px;text-wrap:pretty}
.sg a:hover>span{text-decoration:underline;text-underline-offset:3px}
.tools{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin-top:22px}
.tool{position:relative;display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:18px;align-items:center;padding:16px 22px 16px 18px;background:var(--paper2);
  border:1px solid rgba(14,47,54,.5);box-shadow:inset 0 0 0 3px var(--paper2),inset 0 0 0 4px rgba(42,107,116,.32)}
.tool::after{content:"";position:absolute;top:10px;bottom:10px;right:78px;border-left:1px dashed rgba(42,107,116,.5)}
.tool .ic{width:46px;height:46px;color:var(--engr)}
.tool small{display:block;font-size:13px;letter-spacing:.16em;color:var(--engr);font-weight:600}
.tool b{display:block;font-size:17px;line-height:1.4}
.tool em{display:block;font-style:normal;font-size:13.5px;line-height:1.6;color:var(--ink2);margin-top:2px}
.tool i{font:400 20px/1 Sora,sans-serif;font-style:normal;color:var(--engr);width:40px;text-align:center}
.tool:hover b{text-decoration:underline;text-underline-offset:3px}
.foot{max-width:1440px;margin:0 auto;padding:0 32px 40px}
.foot-in{display:flex;align-items:center;gap:22px;padding-top:16px;border-top:1px solid var(--line);font-size:13px;color:var(--ink2)}
.foot-in .brand{font-size:13px;color:var(--ink)}
.foot-in .brand svg{width:20px;height:20px}
.foot-in nav{display:flex;gap:18px;margin-left:auto}
.foot-in nav a:hover{color:var(--ink)}

/* ---------- 761–1279: two-column board ---------- */
@media (max-width:1439px){
  .c-intro .bd{padding:28px 18px 20px}
  h1{letter-spacing:0}
  .note .rose{width:210px;height:210px;right:-55px;top:30px}
}

/* ---------- short laptop viewports (e.g. 1536×864 / 1536×730 at 125%) ---------- */
@media (min-width:1280px) and (max-height:880px){
  .hero{padding-top:6px}
  .board{padding:12px;gap:8px}
}
@media (min-width:1280px) and (max-height:800px){
  .board{grid-template-rows:auto minmax(0,1fr) auto}
  .c-intro{grid-area:1/1}
  .c-read{grid-area:2/1}
  .c-code{grid-area:1/2/3/3}
  .c-map{grid-area:1/3/3/4}
  .c-sos{grid-area:3/1/4/4}
  .med.j1{grid-area:3/2}.med.j2{grid-area:3/3}
  .c-intro .bd{padding:22px 20px 18px}
  h1{font-size:clamp(26px,2.05vw,31px);margin-bottom:12px}
  .lede{font-size:15px;line-height:1.75}
  .c-intro .rope,.c-intro .creed{display:none}
  .c-read .band .mk{display:none}
  .c-read .band .bt{flex:1;min-width:0;display:flex;align-items:center;gap:12px;white-space:nowrap}
  .c-read .band .bt::before,.c-read .band .bt::after{content:"";flex:1;min-width:8px;height:3.8px;border-top:1px solid rgba(42,107,116,.5);border-bottom:.8px solid rgba(42,107,116,.5)}
  .read{grid-template-columns:minmax(0,1fr) auto;gap:6px 14px;padding:14px 18px 14px 18px;align-content:center}
  .read .tag{grid-column:1/-1;writing-mode:horizontal-tb;border-left:0;padding:0}
  .read b{font-size:17px}
  .read small{font-size:13px}
  .read .go{width:40px;height:40px;font-size:19px}
  .c-sos ul{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:0 28px;padding:6px 20px 2px}
  .c-sos li+li{border-top:0}
  .c-sos a{grid-template-columns:minmax(0,1fr) auto;padding:6px 2px}
  .c-sos a .h{grid-area:2/1;text-align:left}
  .c-sos a i{grid-area:1/2/3/3}
  .sos-edge{display:block;margin:0 20px 10px;padding:8px 2px 0;border-top:1px dotted #aebfbb;font-size:13.5px;line-height:1.7;color:var(--ink2)}
  .sos-edge b{font-size:13px;letter-spacing:.18em;color:var(--engr);font-weight:600;margin-right:12px}
}
@media (max-width:1279px){
  .hero{padding:11px 24px 0}
  .pane[hidden]{display:none}
  .top-in{padding-left:24px;padding-right:24px}
  .board{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
  .c-intro{grid-area:1/1}.c-code{grid-area:1/2}.c-read{grid-area:2/1}.c-sos{grid-area:2/2}.c-map{grid-area:3/1/4/3}
  .med.j1,.med.j2{display:none}
  .c-sos a{grid-template-columns:minmax(0,1fr) auto}
  .c-sos a .h{grid-area:2/1;text-align:left}
  .c-sos a i{grid-area:1/2/3/3}
  .read{gap:18px;padding:12px 20px 12px 18px}
  .read b{font-size:18px}
  .stages{padding-left:24px;padding-right:24px}
  .rail{grid-template-columns:repeat(4,minmax(0,1fr))}
  .sg:nth-child(4n){border-right:0;margin-right:0}
  .sg:nth-child(n+5){border-top:1px solid var(--line)}
  .foot{padding-left:24px;padding-right:24px}
}

.find-m{display:none}
@media (max-width:980px){
  .top-in{gap:26px}
  .nav{gap:20px}
  .find{display:none}
  .find-m{display:inline-grid;place-items:center;width:44px;height:44px;margin:-10px -10px -10px auto;color:var(--ink)}
}

/* ---------- phone ---------- */
@media (max-width:760px){
  .dk{display:none}
  .mo{display:inline}
  .top-in{flex-wrap:wrap;gap:6px 18px;padding:12px 16px 4px}
  .brand{font-size:15px}
  .brand svg{width:26px;height:26px}
  .find{display:none}
  .nav{order:3;width:100%;overflow-x:auto;gap:14px;font-size:14px;white-space:nowrap;padding-bottom:2px;scrollbar-width:none}
  .nav::-webkit-scrollbar{display:none}
  .nav.more{-webkit-mask-image:linear-gradient(90deg,#000 calc(100% - 44px),transparent);mask-image:linear-gradient(90deg,#000 calc(100% - 44px),transparent)}
  .hero{padding:16px 16px 0}
  .board{display:flex;flex-direction:column;gap:14px;padding:0;border:0;background:none;box-shadow:none}
  .med{display:none}
  .c-intro,.c-intro>.bd{display:contents}
  .c-intro>.band,.c-intro .rope{display:none}
  .c-intro h1{order:1;font-size:26px;line-height:1.32;margin:0}
  .c-intro .lede{order:2;font-size:14.5px;line-height:1.65;margin:-6px 0 0}
  .c-code{order:3}.c-read{order:4}.howto-m{order:5}.c-sos{order:6}.c-map{order:7}.c-intro .creed{order:8}
  .c-intro .creed{margin:0;padding:2px 2px 0;font-size:13px;line-height:1.7}
  .c-intro .creed .cr2{display:none}
  .howto-m{display:flex;flex-wrap:wrap;align-items:center;gap:4px 14px;list-style:none;margin:-4px 0 0;padding:0 4px;font-size:13px;line-height:1.6;color:var(--ink2)}
  .howto-m li{display:flex;align-items:center;gap:6px}
  .howto-m .hm-h{flex-basis:100%;font-weight:600;letter-spacing:.12em;color:var(--engr)}
  .howto-m i{flex:none;width:19px;height:19px;border-radius:50%;border:1px solid var(--engr);font:700 13px/17px Sora,sans-serif;font-style:normal;text-align:center;color:var(--engr)}
  .band{height:30px;gap:8px}
  .band .mk{display:none}
  .band .bt{flex:1;min-width:0;display:flex;align-items:center;gap:10px;white-space:nowrap}
  .band .bt::before,.band .bt::after{content:"";flex:1;min-width:8px;height:3.8px;border-top:1px solid rgba(42,107,116,.5);border-bottom:.8px solid rgba(42,107,116,.5)}
  .band.alarm .bt::before,.band.alarm .bt::after{border-color:rgba(181,83,42,.45)}
  .band .no{width:20px;height:20px}
  .band .bt{font-size:13px;letter-spacing:.12em}
  .c-code .bd{padding:10px}
  .note .rose{width:220px;height:220px;right:-30px;top:2px}
  .note .inner{padding:24px 34px 24px 18px}
  .note .foil{right:14px;width:7px}
  .code{margin:6px 0 12px}
  .code strong{font-size:32px;letter-spacing:.11em}
  .copy{height:44px;padding:0 18px}
  .benefit{font-size:15px;margin:12px 0 4px}
  .fine{max-width:none}
  .wv,.how{display:none}
  .read{grid-template-columns:minmax(0,1fr) auto;gap:6px 14px;padding:14px 16px 15px;margin:8px 5px 5px}
  .read .tag{grid-column:1/-1;writing-mode:horizontal-tb;border-left:0;padding:0;font-size:13px}
  .read b{font-size:16.5px;text-wrap:balance}
  .read small{display:none}
  .read .go{width:40px;height:40px;font-size:19px}
  .read img.rg{right:-120px}
  /* map: narrow lane strip floats right of each step, text flows under; lane header sticks */
  .c-map .bd{padding:14px 12px 12px}
  .map-h h2{font-size:16.5px}
  .panes{margin-top:10px}
  .map-h{gap:8px}
  .pane{--lw:126px}
  .pane[hidden]{display:none}
  .lh{position:sticky;top:0;z-index:5;background:var(--paper2);box-shadow:0 6px 6px -6px rgba(14,47,54,.35)}
  .lh-t{padding:5px 6px 5px 0;gap:0;font-size:13px;line-height:1.4}
  .lh-t .lg{margin-right:10px;gap:4px}
  .lh-t .lg .ck{width:24px;height:24px}
  .lh-t .lg .ck b{font-size:13px}
  .lh-l span{padding:4px 0;font-size:13.5px;line-height:1.25}
  .lh-l span small{display:none}
  .lh-l span:first-child{border-left:1px solid var(--line)}
  .st{display:flow-root}
  .st>.ln{float:right;width:var(--lw);margin:5px 0 5px 8px;min-height:40px}
  .ln.tall{min-height:58px}
  .tx{padding:7px 0 5px 38px;line-height:1.55}
  .fork{margin:5px 0 0;padding:2px 8px 3px}
  .rk{margin-top:4px}
  .tx b.t{font-size:14px}
  .fork{clear:right}
  .ck,.gh{top:11px;width:26px;height:26px;margin-left:-13px}
  .ck b{font-size:13px}
  .ck .lk{width:15px;height:15px;right:-6px;bottom:-4px}
  .ck .lk svg{width:9px;height:9px}
  .cap{top:29px}
  .cap.l{box-sizing:content-box;width:2.2em;padding:1px 2px;white-space:normal;text-align:center}
  .cap.pc,.cap.ck-ok{padding:1px 0}
  .ln.tall2{min-height:92px}
  .arc{top:1px;height:9px;border-width:1.6px}
  .a13{top:0;height:11px}
  .arc::after{bottom:-6px;border-width:4px;border-top-width:6px}
  .arc.tr::after{right:-5px}.arc.tl::after{left:-5px}
  .src{text-align:left}
  .c-sos ul{padding:4px 14px 6px}
  .c-sos a{padding:6px 2px}
  .stages{padding:40px 16px 24px}
  .st-head h2{font-size:18px}
  .st-head .mk{display:none}
  .st-head{justify-content:space-between}
  .rail{grid-template-columns:minmax(0,1fr)}
  .sg,.sg:nth-child(4n){border-right:0;margin:0;padding:14px 0 6px;border-bottom:1px solid var(--line)}
  .sg:nth-child(n+5){border-top:0}
  .sg>b{margin:4px 0 10px}
  .tools{grid-template-columns:minmax(0,1fr);gap:12px}
  .tool{padding:14px;gap:14px}
  .tool::after{display:none}
  .tool i{width:auto}
  .tool .ic{width:38px;height:38px}
  .foot{padding:0 16px 32px}
  .foot-in{flex-wrap:wrap;gap:10px 18px}
  .foot-in nav{margin-left:0;flex-wrap:wrap}
}
@media (max-width:374px){
  .nav{gap:10px}
}

/* ======================= inner pages ======================= */
.wrap{max-width:1240px;margin:0 auto;padding:0 32px}
.skip{position:absolute;left:-999px;top:0;z-index:20;background:var(--ink);color:#fff;padding:8px 14px}
.skip:focus{left:12px;top:8px}
.crumbs{list-style:none;display:flex;flex-wrap:wrap;gap:0 8px;margin:22px 0 0;padding:0;font-size:13px;color:var(--ink2)}
.crumbs li+li::before{content:"/";margin-right:8px;color:var(--mute)}
.crumbs a:hover{color:var(--ink);text-decoration:underline;text-underline-offset:3px}

/* engraved eyebrow, shared by article / list / tool heads */
.eyebrow{display:flex;align-items:center;gap:10px;margin:0 0 12px;font:600 13px/1.4 Sora,var(--cjk);letter-spacing:.14em;color:var(--engr)}
.eyebrow .no{flex:none;width:24px;height:24px;border-radius:50%;border:1px solid currentColor;padding:1px;box-shadow:0 0 0 2px var(--paper),0 0 0 2.6px rgba(42,107,116,.45)}
.eyebrow .no svg{display:block;width:100%;height:100%}
.eyebrow::after{content:"";flex:1;max-width:220px;height:3.8px;border-top:1px solid rgba(42,107,116,.45);border-bottom:.8px solid rgba(42,107,116,.45)}
.eyebrow.alarm{color:var(--rust)}

.ahead{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,.86fr);gap:40px;align-items:end;padding:26px 0 30px;border-bottom:1.5px solid var(--ink);position:relative}
.ahead::after{content:"";position:absolute;left:0;right:0;bottom:-5px;border-bottom:.8px solid var(--engr);opacity:.6}
.ahead.solo{grid-template-columns:minmax(0,1fr)}
.ahead h1{font-size:clamp(28px,3vw,40px);line-height:1.3;margin:0 0 14px;font-weight:800;letter-spacing:.01em;text-wrap:balance}
.dek{font-size:17px;line-height:1.8;color:var(--ink2);margin:0 0 16px;max-width:40em;text-wrap:pretty}
.byline{display:flex;flex-wrap:wrap;gap:4px 18px;margin:0;font-size:13.5px;color:var(--ink2)}
.byline b{color:var(--ink);font-weight:600}
.byline a{border-bottom:1px solid rgba(42,107,116,.45)}
.cover{margin:0;position:relative;padding:8px;background:var(--paper2);border:1px solid rgba(14,47,54,.55);box-shadow:inset 0 0 0 3px var(--paper2),inset 0 0 0 4px rgba(42,107,116,.38)}
.cover img{display:block;width:100%;height:auto;aspect-ratio:1200/630;object-fit:cover}
.cover figcaption{font-size:13px;color:var(--ink2);padding:8px 2px 0}

.abody{display:grid;grid-template-columns:minmax(0,1fr) 272px;gap:56px;align-items:start;padding:34px 0 20px}
.abody.wide{grid-template-columns:minmax(0,1fr)}
.toc{position:sticky;top:18px;order:2;font-size:14px}
.toc details{background:var(--paper2);border:1px solid rgba(14,47,54,.5);box-shadow:inset 0 0 0 3px var(--paper2),inset 0 0 0 4px rgba(42,107,116,.32);padding:14px 16px 10px}
.toc summary{list-style:none;cursor:pointer;display:flex;align-items:center;gap:8px;font:600 13px/1.4 Sora,var(--cjk);letter-spacing:.16em;color:var(--engr)}
.toc summary::-webkit-details-marker{display:none}
.toc summary::before{content:"▸";font-size:12px;letter-spacing:0;transition:transform .2s}
.toc details[open]>summary::before{transform:rotate(90deg)}
.toc summary::after{content:"";flex:1;height:3.8px;border-top:1px solid rgba(42,107,116,.45);border-bottom:.8px solid rgba(42,107,116,.45)}
.toc nav ol{margin:10px 0 0;padding:0 0 0 20px;color:var(--engr)}
.toc nav li{margin:6px 0;line-height:1.55}
.toc nav li::marker{font:600 12.5px Sora,sans-serif}
.toc nav a{color:var(--ink2)}
.toc nav a:hover{color:var(--ink);text-decoration:underline;text-underline-offset:3px}

/* prose */
.prose{min-width:0;max-width:740px;font-size:17px;line-height:1.85;color:var(--ink)}
.prose>*:first-child{margin-top:0}
.prose p{margin:0 0 1.1em;text-wrap:pretty}
.prose h2{position:relative;font-size:24px;line-height:1.45;margin:2.1em 0 .8em;padding-top:16px;font-weight:800;letter-spacing:.01em;scroll-margin-top:16px}
.prose h2::before{content:"";position:absolute;left:0;top:0;width:64px;height:3.8px;border-top:1px solid var(--engr);border-bottom:.8px solid var(--engr)}
.prose h3{font-size:19px;line-height:1.5;margin:1.7em 0 .6em;font-weight:700;scroll-margin-top:16px}
.prose a{color:var(--engr);border-bottom:1px solid rgba(42,107,116,.4)}
.prose a:hover{color:var(--ink);border-color:var(--ink)}
.prose strong{font-weight:700}
.prose ul,.prose ol{margin:0 0 1.2em;padding-left:1.4em}
.prose li{margin:.35em 0}
.prose li::marker{color:var(--engr)}
.prose ol>li::marker{font:600 .9em Sora,sans-serif}
.prose blockquote{margin:1.4em 0;padding:4px 0 4px 18px;border-left:3px double var(--engr);color:var(--ink2)}
.prose hr{border:0;height:18px;margin:2em 0;background:url(/assets/img/rope.svg) left center/760px 18px repeat-x;opacity:.7}
.prose code{font-family:Sora,var(--cjk);font-size:.92em;background:rgba(42,107,116,.08);padding:1px 5px;border-radius:3px}
.prose em{font-style:normal;background:linear-gradient(transparent 62%,var(--amber) 62%)}
.tbl{overflow-x:auto;margin:1.3em 0 1.6em;border:1px solid rgba(14,47,54,.5);box-shadow:inset 0 0 0 3px var(--paper2),inset 0 0 0 4px rgba(42,107,116,.3);background:var(--paper2)}
.tbl table{width:100%;border-collapse:collapse;font-size:15px;line-height:1.65}
.tbl th{text-align:left;font-weight:700;padding:10px 14px;background:var(--hair),#E8EEEB;border-bottom:1px solid rgba(42,107,116,.5);white-space:nowrap}
.tbl td{padding:10px 14px;border-top:1px dotted #aebfbb;vertical-align:top;min-width:6em}
.tbl tr:first-child td{border-top:0}

/* blocks */
.nt{position:relative;margin:1.4em 0;padding:14px 18px 4px 18px;background:var(--paper2);border:1px solid rgba(14,47,54,.42);box-shadow:inset 0 0 0 3px var(--paper2),inset 0 0 0 4px rgba(42,107,116,.28);font-size:16px;line-height:1.8}
.nt>b{display:block;font-size:14px;letter-spacing:.12em;color:var(--engr);margin-bottom:4px}
.nt.warn{background:#FBF4E6;box-shadow:inset 0 0 0 3px #FBF4E6,inset 0 0 0 4px rgba(181,83,42,.35);border-color:rgba(181,83,42,.55)}
.nt.warn>b{color:var(--rust)}
.nt.stop{background:#F8ECE6;box-shadow:inset 0 0 0 3px #F8ECE6,inset 0 0 0 4px rgba(181,83,42,.5);border-color:var(--rust)}
.nt.stop>b{color:var(--rust)}
.nt.ok>b{color:var(--engr)}
.basis{position:relative;margin:1.2em 0 1.6em;padding:12px 16px 2px 16px;border:1px dashed rgba(42,107,116,.6);background:rgba(246,248,247,.7);font-size:15px;line-height:1.8;color:var(--ink2)}
.basis::before{content:"依据 · " attr(data-checked) " 核对";position:absolute;top:-10px;left:12px;padding:0 6px;background:var(--paper);font:600 12.5px/18px Sora,var(--cjk);letter-spacing:.1em;color:var(--engr)}
.basis-line{font-size:14.5px;color:var(--ink2);border-top:1px dotted #aebfbb;padding-top:8px}
.basis-line .lab{font-weight:600;color:var(--engr);margin-right:8px;letter-spacing:.08em}
.shot{max-width:418px;margin:1.5em 0;padding:8px;background:var(--paper2);border:1px solid rgba(14,47,54,.5);box-shadow:inset 0 0 0 3px var(--paper2),inset 0 0 0 4px rgba(42,107,116,.3)}
.shot img{display:block;width:100%;height:auto}
.shot figcaption{font-size:13.5px;line-height:1.6;color:var(--ink2);padding:8px 2px 0}
.steps-l{counter-reset:s;list-style:none;padding:0!important;margin:1.2em 0 1.5em}
.steps-l>li{counter-increment:s;position:relative;padding:2px 0 10px 46px;margin:0!important}
.steps-l>li::before{content:counter(s);position:absolute;left:0;top:2px;width:28px;height:28px;border-radius:50%;border:1px solid var(--engr);box-shadow:0 0 0 2px var(--paper),0 0 0 2.6px rgba(42,107,116,.45);font:700 13px/26px Sora,sans-serif;text-align:center;color:var(--engr)}
.steps-l>li::after{content:"";position:absolute;left:14px;top:34px;bottom:2px;border-left:1px solid rgba(42,107,116,.4)}
.steps-l>li:last-child::after{display:none}

/* code card inside the register guide (same ticket as home) */
.cc{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,1fr);gap:22px;margin:1.6em 0;padding:12px;background:var(--lattice),#E3EAE7;border:1.5px solid var(--ink);box-shadow:inset 0 0 0 3px var(--paper),inset 0 0 0 4px var(--engr)}
.cc .note{min-height:250px}
.cc .side{align-self:start;padding:16px 18px 10px;font-size:15.5px;line-height:1.75;background:var(--paper2);border:1px solid rgba(14,47,54,.5);box-shadow:inset 0 0 0 3px var(--paper2),inset 0 0 0 4px rgba(42,107,116,.3)}
.cc .side .howto{margin:4px 0 8px}
.lhead .intro a{color:var(--engr);border-bottom:1px solid rgba(42,107,116,.4)}
.cc .side p{margin:0 0 10px}
.cc .go{grid-column:1/-1;display:flex;flex-wrap:wrap;align-items:center;gap:8px 18px;padding:14px 18px;background:var(--paper2);border:1px solid rgba(14,47,54,.5);box-shadow:inset 0 0 0 3px var(--paper2),inset 0 0 0 4px rgba(42,107,116,.3)}
.cc .go .fine{flex:1 1 240px;margin:0}
.btn{appearance:none;border:0;cursor:pointer;display:inline-flex;align-items:center;gap:8px;background:var(--ink);color:#fff!important;font:600 15px/1 var(--cjk);padding:0 18px;height:44px;border-radius:9px;border-bottom:0!important;white-space:nowrap;box-shadow:inset 0 0 0 3px var(--ink),inset 0 0 0 4px rgba(159,198,201,.45)}
.btn.ghost{background:var(--paper2);color:var(--ink)!important;box-shadow:inset 0 0 0 1px var(--ink),inset 0 0 0 3px var(--paper2),inset 0 0 0 4px rgba(42,107,116,.35)}
.btn.done{background:var(--engr);color:#fff!important}
.cc .fine{background:none;box-shadow:none;max-width:none}

/* faq */
.faq{margin:2.4em 0 0;border-top:1.5px solid var(--ink)}
.faq h2{margin-top:1.2em}
.faq details{border-bottom:1px dotted #aebfbb;padding:12px 0}
.faq summary{cursor:pointer;font-weight:700;font-size:17px;line-height:1.6;list-style:none;display:flex;gap:10px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::before{content:"问";flex:none;width:24px;height:24px;margin-top:2px;border-radius:50%;border:1px solid var(--engr);font:600 13px/22px var(--cjk);text-align:center;color:var(--engr)}
.faq details p{margin:8px 0 2px 34px;color:var(--ink2);font-size:16px}

/* after the article */
.after{margin:2.6em 0 0;display:grid;gap:18px}
.tagline{display:flex;flex-wrap:wrap;align-items:center;gap:8px 10px;font-size:14px}
.tagline .k{font:600 13px Sora,var(--cjk);letter-spacing:.14em;color:var(--engr);margin-right:4px}
.tagline a,.tagline span.t{padding:3px 10px;border:1px solid rgba(42,107,116,.45);border-radius:999px;color:var(--ink);background:var(--paper2)}
.tagline span.t{color:var(--ink2);border-style:dashed}
.tagline a:hover{border-color:var(--ink)}
.stuck{padding:14px 18px;border:1px dashed rgba(14,47,54,.42);font-size:15px;line-height:1.75;color:var(--ink2);background:rgba(246,248,247,.7)}
.stuck b{color:var(--ink)}
.stuck a{color:var(--engr);border-bottom:1px solid rgba(42,107,116,.4)}
.byme{display:grid;grid-template-columns:auto minmax(0,1fr);gap:16px;align-items:start;padding:16px 18px;background:var(--paper2);border:1px solid rgba(14,47,54,.5);box-shadow:inset 0 0 0 3px var(--paper2),inset 0 0 0 4px rgba(42,107,116,.3)}
.byme .av{width:48px;height:48px;border-radius:50%;display:grid;place-items:center;font-size:20px;font-weight:700;color:var(--ink);background:var(--paper);box-shadow:0 0 0 1px var(--ink),0 0 0 3px var(--paper2),0 0 0 3.7px var(--engr)}
.byme b{display:block;font-size:16px}
.byme p{margin:4px 0 0;font-size:14.5px;line-height:1.75;color:var(--ink2)}
.byme a{color:var(--engr);border-bottom:1px solid rgba(42,107,116,.4)}
.pn{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.pn a{display:block;padding:12px 16px;border-top:1.5px solid var(--ink);font-size:15.5px;line-height:1.6}
.pn a small{display:block;font:600 12.5px Sora,var(--cjk);letter-spacing:.14em;color:var(--engr);margin-bottom:2px}
.pn a.nx{text-align:right}
.pn a:hover b{text-decoration:underline;text-underline-offset:3px}
.rel h2{font-size:17px;margin:0 0 6px}
.rel ul{list-style:none;margin:0;padding:0}
.rel li{border-top:1px dotted #aebfbb}
.rel a{display:block;padding:9px 2px;font-size:15.5px;line-height:1.6}
.rel a:hover{color:var(--engr)}

/* list / term / taxonomy */
.lhead{padding:24px 0 26px;border-bottom:1.5px solid var(--ink);position:relative;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:40px;align-items:end}
.lhead::after{content:"";position:absolute;left:0;right:0;bottom:-5px;border-bottom:.8px solid var(--engr);opacity:.6}
.lhead h1{font-size:clamp(28px,3vw,38px);line-height:1.3;margin:0;font-weight:800}
.lhead .cnt{font:600 13px Sora,var(--cjk);letter-spacing:.1em;color:var(--ink2);margin-top:8px}
.lhead .intro{font-size:16px;line-height:1.85;color:var(--ink2)}
.lhead .intro p{margin:0 0 .8em}
.grp{display:grid;grid-template-columns:200px minmax(0,1fr);gap:28px;padding:26px 0;border-bottom:1px solid var(--line)}
.grp h2{margin:0;font-size:20px;line-height:1.4}
.grp h2 span{display:block;font:700 13px Sora,sans-serif;color:var(--engr);letter-spacing:.08em;margin-bottom:4px}
.grp h2.warn{color:var(--rust)}
.grp .gl{font-size:14px;line-height:1.7;color:var(--ink2);margin:8px 0 0}
.items{list-style:none;margin:0;padding:0}
.items li+li{border-top:1px dotted #aebfbb}
.items a{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:4px 20px;align-items:baseline;padding:12px 2px}
.items a b{font-size:17px;line-height:1.55}
.items a i{grid-column:1;font-style:normal;font-size:14.5px;line-height:1.7;color:var(--ink2)}
.items a time{grid-row:1;grid-column:2;font:400 13px Sora,sans-serif;color:var(--mute)}
.items a:hover b{color:var(--engr)}
.pager{display:flex;justify-content:space-between;align-items:center;padding:20px 0 40px;font-size:15px}
.pager a{color:var(--engr);border-bottom:1px solid rgba(42,107,116,.4)}
.tlist{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;padding:26px 0 50px}
.tlist a{display:block;padding:16px 18px;background:var(--paper2);border:1px solid rgba(14,47,54,.5);box-shadow:inset 0 0 0 3px var(--paper2),inset 0 0 0 4px rgba(42,107,116,.3)}
.tlist a b{display:block;font-size:18px;margin-bottom:4px}
.tlist a i{display:block;font-style:normal;font-size:14.5px;line-height:1.7;color:var(--ink2)}
.tlist a:hover b{color:var(--engr)}

/* plain pages */
.pg-plain{max-width:760px;padding:30px 0 60px}

/* search */
.sbox{display:flex;gap:10px;margin:24px 0 10px;max-width:640px}
.sbox input{flex:1;min-width:0;height:46px;padding:0 14px;border:1px solid rgba(14,47,54,.5);background:var(--paper2);font:16px var(--cjk);color:var(--ink);border-radius:8px}
.sbox input:focus{outline:2px solid var(--engr);outline-offset:1px}
.hint{font-size:14px;color:var(--ink2);min-height:1.6em}
.hits{list-style:none;margin:10px 0 40px;padding:0;max-width:760px}
.hits li+li{border-top:1px dotted #aebfbb}
.hits a{display:block;padding:12px 2px}
.hits a b{display:block;font-size:17px}
.hits a i{display:block;font-style:normal;font-size:14.5px;color:var(--ink2);line-height:1.7}
.hits a small{font:600 12.5px Sora,var(--cjk);letter-spacing:.1em;color:var(--engr)}
.miss{font-size:15px;color:var(--ink2);margin:0 0 50px}
.miss a{color:var(--engr);border-bottom:1px solid rgba(42,107,116,.4)}

/* tools */
.tool-ui{margin:28px 0 10px;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:0;border:1.5px solid var(--ink);box-shadow:inset 0 0 0 3px var(--paper),inset 0 0 0 4px var(--engr);background:var(--paper2)}
.tool-ui .in{padding:24px 26px;border-right:1px solid rgba(42,107,116,.4)}
.tool-ui .out{padding:24px 26px;background:var(--ink);color:#E8F0EE;position:relative;overflow:hidden}
.tool-ui .out::before{content:"";position:absolute;right:-90px;top:-80px;width:340px;height:340px;background:url(/assets/img/rose-dark.svg) center/contain no-repeat;opacity:.35;pointer-events:none}
.tool-ui .out>*{position:relative}
.fld{display:block;margin:0 0 16px}
.fld[hidden]{display:none}
.fld>span{display:block;font-size:14.5px;font-weight:600;margin-bottom:6px}
.fld>small{display:block;font-size:13px;color:var(--ink2);margin-top:5px;line-height:1.6}
.fld input,.fld select{width:100%;height:46px;padding:0 12px;border:1px solid rgba(14,47,54,.5);border-radius:8px;background:#fff;font:600 17px Sora,var(--cjk);color:var(--ink)}
.fld input:focus,.fld select:focus{outline:2px solid var(--engr);outline-offset:1px}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chips label{display:inline-flex;align-items:center;gap:6px;padding:8px 12px;border:1px solid rgba(14,47,54,.45);border-radius:999px;cursor:pointer;font-size:14.5px;background:#fff}
.chips input{accent-color:var(--engr)}
.chips label:has(input:checked){border-color:var(--ink);background:var(--amber)}
.big{font:700 44px/1.1 Sora,var(--cjk);color:#fff;margin:6px 0 4px}
.big small{font-size:18px;font-weight:600;color:#9FC6C9;margin-left:6px}
.out .lab2{font:600 13px Sora,var(--cjk);letter-spacing:.14em;color:#9FC6C9}
.out dl{display:grid;grid-template-columns:auto 1fr;gap:6px 16px;margin:16px 0 0;font-size:15px}
.out dt{color:#A9C2C3}
.out dd{margin:0;text-align:right;font-family:Sora,var(--cjk);font-weight:600}
.out .say{margin:16px 0 0;padding-top:12px;border-top:1px dashed rgba(159,198,201,.4);font-size:15px;line-height:1.75;color:#DCE8E6}
.out .say b{color:var(--amber)}
.out .say a{color:var(--amber);border-bottom:1px solid rgba(244,227,193,.5)}
.out ol{margin:10px 0 0;padding-left:1.3em;font-size:15px;line-height:1.75}
.guide{max-width:760px}

/* footer */
.ft{margin-top:40px;border-top:1.5px solid var(--ink);position:relative;background:var(--paper2)}
.ft::before{content:"";position:absolute;left:0;right:0;top:3px;border-top:.8px solid var(--engr);opacity:.6}
.ft-in{max-width:1440px;margin:0 auto;padding:32px 32px 26px;display:grid;grid-template-columns:minmax(0,1.5fr) repeat(3,minmax(0,.6fr));gap:32px}
.ft-in p{margin:10px 0 0;font-size:14px;line-height:1.85;color:var(--ink2);max-width:36em}
.ft-in p a{color:var(--engr);border-bottom:1px solid rgba(42,107,116,.4)}
.ft-in .fh{margin:0 0 10px;font-size:14px;font-weight:700;line-height:1.7;letter-spacing:.12em;color:var(--engr);max-width:none}
.ft-in ul{list-style:none;margin:0;padding:0;font-size:14.5px;line-height:2}
.ft-in ul a:hover{color:var(--engr)}
.ft-low{max-width:1440px;margin:0 auto;padding:14px 32px 26px;display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px 20px;font-size:13px;color:var(--ink2);border-top:1px solid var(--line)}
.ft-low a{color:var(--engr)}

@media (max-width:1100px){
  .abody{grid-template-columns:minmax(0,1fr)}
  .toc{position:static;order:0}
}
@media (max-width:760px){
  .wrap{padding:0 16px}
  .ahead{grid-template-columns:minmax(0,1fr);gap:10px;padding:18px 0 22px}
  .ahead .cover{display:none}
  .toc details{padding:10px 14px 8px}
  .ahead h1{font-size:26px}
  .dek{font-size:15.5px;line-height:1.75}
  .abody{padding:22px 0 10px;gap:20px}
  .prose{font-size:16px;line-height:1.85}
  .prose h2{font-size:21px}
  .prose h3{font-size:17.5px}
  .cc{grid-template-columns:minmax(0,1fr);gap:8px}
  .pn{grid-template-columns:minmax(0,1fr)}
  .pn a.nx{text-align:left}
  .lhead{grid-template-columns:minmax(0,1fr);gap:12px;padding:18px 0 20px}
  .grp{grid-template-columns:minmax(0,1fr);gap:8px;padding:18px 0}
  .items a{grid-template-columns:minmax(0,1fr)}
  .items a time{grid-row:auto;grid-column:1}
  .tlist{grid-template-columns:minmax(0,1fr)}
  .tool-ui{grid-template-columns:minmax(0,1fr)}
  .tool-ui .in{border-right:0;border-bottom:1px solid rgba(42,107,116,.4);padding:18px 16px}
  .tool-ui .out{padding:18px 16px}
  .big{font-size:36px}
  .ft-in{grid-template-columns:repeat(2,minmax(0,1fr));padding:24px 16px 18px;gap:20px}
  .ft-in>div:first-child{grid-column:1/-1}
  .ft-low{padding:12px 16px 22px}
  .crumbs{margin-top:14px}
}

.home-tags{margin-top:22px}
.tool .ic{display:block}
/* phone: each table row becomes a card, header text shown before each cell */
@media (max-width:760px){
  .tbl{overflow:visible}
  .tbl table,.tbl tbody,.tbl tr,.tbl td{display:block;width:auto}
  .tbl thead{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
  .tbl tr{padding:10px 14px 12px;border-top:1px solid rgba(42,107,116,.45)}
  .tbl tr:first-child{border-top:0}
  .tbl td{border:0;padding:2px 0;min-width:0}
  .tbl td:first-child{font-weight:700;color:var(--ink);padding-bottom:4px}
  .tbl td[data-th]:not(:first-child)::before{content:attr(data-th) "：";color:var(--ink2);font-size:13.5px}
}
/* tools: radio / checkbox lists */
fieldset.fld{border:0;padding:0;min-width:0}
fieldset.fld>legend{padding:0;margin-bottom:8px}
fieldset.fld>legend>span{display:block;font-size:14.5px;font-weight:600}
.chips.col{flex-direction:column;align-items:stretch;gap:6px}
.chips.col label{border-radius:10px;align-items:flex-start;line-height:1.55;padding:9px 12px}
.chips.col input{margin-top:4px;flex:none}
.big.fz-big{font-size:28px;line-height:1.3}
.out dl dd[style]{font-family:inherit;font-weight:400;line-height:1.7}
@media (max-width:760px){.big.fz-big{font-size:24px}}
.fld .chips input{width:16px;height:16px;padding:0;border:0;border-radius:0;background:none;flex:none}
/* phone: tap targets at least 44px tall */
@media (max-width:760px){
  .ft ul a,.toc ol a,.nav a{display:inline-flex;align-items:center;min-height:44px}
  .tagline a,.tagline span.t{display:inline-flex;align-items:center;min-height:44px;padding:0 14px}
  .faq summary{min-height:44px;align-items:center}
  .c-map .tg button{min-height:44px}
  .crumbs a,.byline a,.ft-low a,.stuck a{padding:14px 0}
  .crumbs{position:relative;z-index:1}
  .stuck a{position:relative}
  .byline a,.stuck a{border-bottom:0;text-decoration:underline;text-decoration-color:rgba(42,107,116,.45);text-underline-offset:3px}
  .brand{display:inline-flex;align-items:center;min-height:44px;margin:-9px 0}
  .st-head .all{display:inline-flex;align-items:center;min-height:44px}
  .toc summary{min-height:44px}
  .chips.col label{min-height:44px}
  .pn a small{font-size:13px}
}