:root{
  --paper:#FFFDF6; --card:#FFFFFF; --ink:#16283D; --ink-soft:#5A6B80;
  --dino:#14539A; --dino-bright:#4EA8E8; --sun:#FFC845; --mint:#2FA97A;
  --rule:#DCE4EE; --field:#FFFFFF; --shade:rgba(20,83,154,.10);
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --paper:#0F1826; --card:#182437; --ink:#E9F1FA; --ink-soft:#95A7BD;
    --dino:#5FB0F0; --dino-bright:#7CC4FA; --sun:#FFD470; --mint:#4FCB9A;
    --rule:#2A3B54; --field:#0F1826; --shade:rgba(0,0,0,.35);
  }
}
:root[data-theme="dark"]{
  --paper:#0F1826; --card:#182437; --ink:#E9F1FA; --ink-soft:#95A7BD;
  --dino:#5FB0F0; --dino-bright:#7CC4FA; --sun:#FFD470; --mint:#4FCB9A;
  --rule:#2A3B54; --field:#0F1826; --shade:rgba(0,0,0,.35);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{background:var(--paper);color:var(--ink);
  font-family:Nunito,"Segoe UI",system-ui,-apple-system,sans-serif;
  font-size:17px;line-height:1.5;-webkit-font-smoothing:antialiased}
h1,h2,.brandname,.bigbtn{font-family:Fredoka,Nunito,system-ui,sans-serif;font-weight:600}
.wrap{max-width:1000px;margin:0 auto;padding:20px 20px 64px}
.narrow{max-width:520px}

.mast{display:flex;align-items:center;gap:14px;padding:8px 0 18px}
.mast svg{width:52px;height:52px;flex:none}
.brandname{font-size:24px;letter-spacing:.2px;line-height:1.1}
.practice{font-size:14px;color:var(--ink-soft);line-height:1.3}

.steps{display:flex;gap:8px;margin-bottom:26px}
.steps div{flex:1;height:5px;border-radius:99px;background:var(--rule)}
.steps div.on{background:var(--dino)}
.stepno{font-size:13.5px;font-weight:700;color:var(--ink-soft);margin-bottom:6px}

h1{font-size:27px;margin:0 0 5px;line-height:1.2}
.sub{margin:0 0 22px;color:var(--ink-soft);font-size:15.5px;max-width:56ch}
.panel{display:none}
.panel.on{display:block}
.pane{background:var(--card);border:1px solid var(--rule);border-radius:14px;
  padding:22px;box-shadow:0 6px 18px var(--shade);margin-bottom:18px}

label{display:block;font-size:13.5px;font-weight:700;color:var(--ink-soft);margin:0 0 5px}
input,select{width:100%;font-family:inherit;font-size:17px;color:var(--ink);
  background:var(--field);border:1.5px solid var(--rule);border-radius:9px;padding:13px;
  transition:border-color .15s ease, box-shadow .15s ease}
select{appearance:none}
input:focus-visible,select:focus-visible{outline:none;border-color:var(--dino-bright);
  box-shadow:0 0 0 3px color-mix(in srgb,var(--dino-bright) 35%,transparent)}
button:focus-visible{outline:2px solid var(--dino-bright);outline-offset:3px}
input.bad,select.bad{border-color:#D9534F}
.err{display:none;font-size:13px;color:#D9534F;margin-top:5px;font-weight:600}
.err.on{display:block}
.row{display:grid;gap:12px;grid-template-columns:1fr 1fr;margin-bottom:12px}
.row.one{grid-template-columns:1fr}
.row.city{grid-template-columns:1fr 88px 108px}
@media(max-width:560px){.row,.row.city{grid-template-columns:1fr}}
.fieldnote{font-size:13px;color:var(--ink-soft);margin-top:5px}

.bigbtn{width:100%;border:0;border-radius:12px;cursor:pointer;background:var(--dino);
  color:#fff;font-size:19px;padding:17px 18px;
  box-shadow:0 6px 0 color-mix(in srgb,var(--dino) 62%,#000);
  transition:transform .08s ease, box-shadow .08s ease}
.bigbtn:hover{filter:brightness(1.06)}
.bigbtn:active{transform:translateY(4px);box-shadow:0 2px 0 color-mix(in srgb,var(--dino) 62%,#000)}
.bigbtn[disabled]{opacity:.45;cursor:not-allowed;box-shadow:none;transform:none}
.ghost{background:none;border:0;color:var(--dino);font-family:inherit;font-size:15px;
  font-weight:700;cursor:pointer;padding:10px 0;text-decoration:none;display:inline-block}
.ghost:hover{text-decoration:underline}
.billnote{text-align:center;font-size:13.5px;color:var(--ink-soft);margin-top:11px}

.gwrap{border:1.5px solid var(--rule);border-radius:9px;background:var(--field);padding:2px}
.gwrap:focus-within{border-color:var(--dino-bright);
  box-shadow:0 0 0 3px color-mix(in srgb,var(--dino-bright) 35%,transparent)}
.gwrap input{border:0;box-shadow:none!important}
.gwrap input.bad{border:1.5px solid #D9534F;border-radius:8px}
.glogo{display:flex;align-items:center;gap:6px;justify-content:flex-end;
  font-size:11.5px;color:var(--ink-soft);margin-top:6px}
.manual{margin-top:16px}
.manual.hidden{display:none}

/* practice code field */
.codefield{display:flex;gap:10px;align-items:flex-start}
.codefield input{font-family:Fredoka,monospace;font-size:24px;letter-spacing:3px;
  text-transform:uppercase;font-weight:600;max-width:220px;text-align:center}
.codestate{font-size:14px;font-weight:700;padding-top:16px}
.codestate.free{color:var(--mint)}
.codestate.taken{color:#D9534F}

.doc{border:1.5px solid var(--rule);border-radius:12px;padding:16px;margin-bottom:12px;position:relative}
.doc .drop{position:absolute;top:10px;right:12px;background:none;border:0;color:var(--ink-soft);
  font-size:20px;line-height:1;cursor:pointer;padding:4px 8px;border-radius:6px}
.doc .drop:hover{color:#D9534F}
.doclabel{font-family:Fredoka,sans-serif;font-size:16px;margin-bottom:12px;color:var(--ink-soft)}

.agree{display:flex;gap:11px;align-items:flex-start;margin-top:18px;
  background:color-mix(in srgb,var(--mint) 9%,var(--card));
  border:1.5px solid color-mix(in srgb,var(--mint) 40%,transparent);
  border-radius:10px;padding:14px 16px}
.agree input{width:22px;height:22px;flex:none;margin-top:1px;accent-color:var(--mint)}
.agree label{font-size:15px;font-weight:600;color:var(--ink);margin:0;cursor:pointer}
.terms{font-size:14.5px;color:var(--ink-soft);margin:18px 0 0;line-height:1.65}
.terms b{color:var(--ink);font-weight:700}

/* envelope */
.cols{display:grid;grid-template-columns:1fr;gap:22px}
@media(min-width:900px){
  .cols{grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);gap:34px;align-items:start}
  .envcol{position:sticky;top:24px;order:2}.formcol{order:1}
}
.envelope{position:relative;background:var(--card);border:1px solid var(--rule);border-radius:6px;
  box-shadow:0 10px 24px var(--shade);padding:20px 22px 26px;min-height:210px;
  transition:transform .45s ease, opacity .45s ease}
.envelope::after{content:"";position:absolute;left:0;right:0;bottom:0;height:6px;
  background:repeating-linear-gradient(135deg,var(--dino) 0 9px,var(--sun) 9px 18px);
  border-radius:0 0 5px 5px;opacity:.85}
.envelope.sealed{transform:translateY(-14px) rotate(-1.5deg);opacity:0}
.envtop{display:flex;justify-content:space-between;align-items:flex-start;gap:16px}
.ret{font-size:12.5px;color:var(--ink-soft);line-height:1.35;max-width:58%}
.stamp{width:56px;height:64px;flex:none;border-radius:3px;background:var(--paper);
  border:2px dashed var(--rule);display:flex;align-items:center;justify-content:center}
.stamp svg{width:40px;height:40px}
.addr{margin-top:34px;padding-left:6px;font-size:18px;line-height:1.55}
.addr .who{font-size:22px;font-weight:700}
.addr .ln{display:block}
.blank{display:block;height:12px;width:60%;margin:11px 0;border-radius:99px;background:var(--rule);opacity:.55}
.blank.w1{width:46%}.blank.w2{width:66%}.blank.w3{width:38%}
.hint{margin-top:14px;font-size:13.5px;color:var(--ink-soft)}

fieldset{border:0;padding:0;margin:0 0 24px}
legend{font-family:Fredoka,sans-serif;font-weight:500;font-size:19px;padding:0;margin-bottom:3px}
.legsub{font-size:13.5px;color:var(--ink-soft);margin-bottom:12px}
.warn{display:none;gap:10px;align-items:flex-start;
  background:color-mix(in srgb,var(--sun) 22%,var(--card));border:1.5px solid var(--sun);
  border-radius:10px;padding:12px 14px;margin-bottom:16px;font-size:14.5px}
.warn.on{display:flex}

.done{display:none;text-align:center;padding:18px 4px}
.done.on{display:block}
.done svg{width:76px;height:76px}
.done h2{font-size:25px;margin:14px 0 6px}
.done p{margin:0 auto 22px;color:var(--ink-soft);max-width:36ch}
.again{border:1.5px solid var(--dino);background:transparent;color:var(--dino);
  font-family:Fredoka,sans-serif;font-size:17px;font-weight:500;padding:13px 26px;
  border-radius:11px;cursor:pointer}
.again:hover{background:color-mix(in srgb,var(--dino) 10%,transparent)}

.today{margin-top:34px;border-top:1px solid var(--rule);padding-top:18px}
.today h2{font-size:16px;margin:0 0 10px;font-family:Nunito;font-weight:700;color:var(--ink-soft)}
.today ul{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:8px}
.today li{font-size:14px;background:color-mix(in srgb,var(--mint) 15%,var(--card));
  border:1px solid color-mix(in srgb,var(--mint) 45%,transparent);color:var(--ink);
  padding:5px 12px;border-radius:99px}
.today .none{color:var(--ink-soft);font-size:14.5px}

/* the big code entry on send.html */
.codeentry{text-align:center;padding:28px 0 8px}
.codeentry input{font-family:Fredoka,monospace;font-size:38px;letter-spacing:8px;
  text-transform:uppercase;font-weight:600;text-align:center;max-width:340px;
  margin:0 auto;padding:18px 13px}
.codeentry .bigbtn{max-width:340px;margin:16px auto 0}
.codeentry .err{text-align:center}

/* the code on the welcome screen */
.codebadge{font-family:Fredoka,monospace;font-size:44px;letter-spacing:8px;font-weight:600;
  color:var(--dino);background:color-mix(in srgb,var(--dino) 9%,var(--card));
  border:2px dashed color-mix(in srgb,var(--dino) 40%,transparent);border-radius:14px;
  padding:18px 10px;text-align:center;margin:8px 0 18px}

.demobar{background:color-mix(in srgb,var(--sun) 30%,var(--card));
  border-bottom:1px solid var(--sun);font-size:13.5px;padding:9px 20px;text-align:center;color:var(--ink)}
.demobar button{background:none;border:0;color:var(--dino);font-weight:700;
  cursor:pointer;font-family:inherit;font-size:13.5px;text-decoration:underline}

@media(prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}