/* Scoped: the tool can also appear in a guide without affecting its host. */
.letter-guide {
  --lt-ink:#071033; --lt-blue:#234bce; --lt-muted:#465471; --lt-line:#dbe3f0;
  color:var(--lt-ink); width:min(100%,70rem); margin-inline:auto;
  padding:clamp(1rem,3.5vw,3rem); box-sizing:border-box; font-family:Inter,system-ui,sans-serif;
  overflow-wrap:anywhere; line-height:1.55;
}
.letter-guide *, .letter-guide *::before, .letter-guide *::after {box-sizing:border-box;}
.letter-guide [hidden] {display:none!important;}
.letter-guide .lt-intro {display:block;position:static;background:transparent;margin:0 0 1.5rem;padding:0;border:0;box-shadow:none;color:inherit;}
.letter-guide .lt-kicker {color:var(--lt-blue);font-size:.78rem;letter-spacing:.075em;text-transform:uppercase;font-weight:750;margin:0 0 .65rem;}
.letter-guide .lt-kicker span {margin-inline:.35rem;color:var(--lt-muted);}
.letter-guide .lt-intro :is(h1,h2,h3) {font-family:"League Spartan",Inter,system-ui,sans-serif;font-weight:750;font-size:clamp(2.1rem,5vw,3.9rem);letter-spacing:-.043em;line-height:1.01;margin:.3rem 0 .85rem;color:var(--lt-ink);text-align:left;text-wrap:balance;}
.letter-guide .lt-lead {max-width:51rem;color:var(--lt-muted);font-size:clamp(1rem,2vw,1.16rem);margin:0;}
.letter-guide .lt-private {font-size:.91rem;color:var(--lt-muted);margin:.85rem 0 0;}
.letter-guide .lt-controls {background:#eef3ff;border:1px solid #ccdafd;border-radius:1.1rem;padding:clamp(.9rem,2.2vw,1.45rem);margin:0 0 1rem;}
.letter-guide .lt-controls label {display:block;font-size:1rem;line-height:1.4;font-weight:720;color:var(--lt-ink);}
.letter-guide .lt-controls select {display:block;border:1px solid #8b9bbf;background:#fff;color:var(--lt-ink);border-radius:.65rem;min-height:3rem;margin-top:.65rem;padding:.5rem .7rem;width:100%;max-width:44rem;font:inherit;font-weight:550;text-overflow:ellipsis;}
.letter-guide :is(a,select,summary):focus-visible {outline:3px solid #2251ff;outline-offset:3px;}
.letter-guide .lt-sr {position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;}
.letter-guide .lt-cases {display:grid;gap:.65rem;}
.letter-guide .lt-case {min-width:0;margin:0;padding:0;border:1px solid var(--lt-line);border-radius:1rem;background:white;box-shadow:0 3px 12px #07103306;}
.letter-guide .lt-case[open] {border-color:#b7c9f2;}
.letter-guide summary {display:flex;align-items:center;justify-content:space-between;gap:.75rem;min-height:3.2rem;list-style:none;padding:.9rem clamp(.9rem,2.5vw,1.5rem);margin:0;border-radius:.95rem;color:var(--lt-ink);cursor:pointer;background:none;}
.letter-guide summary::-webkit-details-marker {display:none;}
.letter-guide summary::after {content:"";flex:none;width:.55rem;height:.55rem;border:solid var(--lt-blue);border-width:0 2px 2px 0;transform:rotate(45deg);margin-right:.35rem;}
.letter-guide details[open]>summary::after {transform:rotate(225deg);}
.letter-guide .lt-recognise,.letter-guide .lt-case-title {display:block;}
.letter-guide .lt-recognise {font-weight:650;font-size:.86rem;color:var(--lt-blue);line-height:1.45;}
.letter-guide .lt-case-title {font-family:"League Spartan",Inter,system-ui,sans-serif;font-size:clamp(1.18rem,2.4vw,1.55rem);line-height:1.2;font-weight:730;margin-top:.22rem;}
.letter-guide .lt-body {padding:0 clamp(.9rem,2.5vw,1.5rem) 1.25rem;color:var(--lt-ink);}
.letter-guide .lt-explain {max-width:60rem;margin:.1rem 0 1rem;}
.letter-guide .lt-sheet {border:1px solid var(--lt-line);border-radius:.9rem;background:#fafbfe;padding:clamp(.85rem,2.5vw,1.45rem);margin:1rem 0;}
.letter-guide .lt-sheet figcaption {font-weight:720;color:var(--lt-ink);font-size:.97rem;}
.letter-guide .lt-sheet figcaption small {display:block;font-weight:480;color:var(--lt-muted);margin-top:.3rem;}
.letter-guide .lt-token {display:inline-block;background:var(--lt-ink);color:white;font:700 .68rem/1.4 Inter,system-ui,sans-serif;letter-spacing:.08em;border-radius:.3rem;padding:.15rem .4rem;margin-right:.3rem;vertical-align:.08em;}
.letter-guide .lt-sheet dl {margin:1rem 0 0;}
.letter-guide .lt-annotation {display:grid;grid-template-columns:minmax(9rem,.62fr) minmax(0,1.9fr);gap:.7rem .9rem;padding:.85rem 0;border-top:1px solid var(--lt-line);}
.letter-guide .lt-annotation:last-child {padding-bottom:0;}
.letter-guide .lt-annotation dt {font-weight:690;font-size:.92rem;color:var(--lt-ink);}
.letter-guide .lt-number {color:var(--lt-blue);font:700 .75rem/1.5 Inter,system-ui,sans-serif;margin-right:.28rem;}
.letter-guide .lt-annotation dd {margin:0;min-width:0;}
.letter-guide .lt-annotation mark {color:#112d75;background:#e4ecff;padding:.12em .22em;font-weight:680;box-decoration-break:clone;-webkit-box-decoration-break:clone;}
.letter-guide .lt-annotation dd>span {display:block;margin-top:.38rem;color:var(--lt-muted);font-size:.94rem;}
.letter-guide .lt-sub {font-size:1.18rem;line-height:1.3;color:var(--lt-ink);margin:1.15rem 0 .6rem;}
.letter-guide .lt-steps {list-style:decimal;padding-inline-start:1.5rem;margin:.5rem 0 1rem;}
.letter-guide .lt-steps li {margin:.38rem 0;padding-left:.15rem;}
.letter-guide .lt-steps li::marker {color:var(--lt-blue);font-weight:700;}
.letter-guide .lt-source {font-size:.91rem;color:var(--lt-muted);}
.letter-guide a {color:#173cae;text-decoration:underline;text-underline-offset:.15em;}
.letter-guide .lt-help {display:flex;flex-wrap:wrap;align-items:center;gap:.8rem 1rem;border-top:1px solid var(--lt-line);padding-top:1rem;margin-top:1rem;}
.letter-guide .lt-help p {flex:1 1 20rem;margin:0;font-size:.93rem;color:var(--lt-muted);}
.letter-guide .lt-help strong {color:var(--lt-ink);}
.letter-guide .lt-help>div {display:flex;flex-wrap:wrap;gap:.45rem;}
.letter-guide a.lt-cta,.letter-guide a.lt-second {display:inline-flex;justify-content:center;align-items:center;padding:.62rem 1.05rem;min-height:2.8rem;text-align:center;font-size:.94rem;font-weight:680;line-height:1.38;border-radius:2rem;text-decoration:none;background:var(--lt-ink);color:#fff;}
.letter-guide a.lt-second {background:#ecf2ff;color:#153786;}
.letter-guide .lt-further {display:flex;flex-wrap:wrap;gap:.45rem 1.3rem;border-top:1px solid var(--lt-line);padding:1rem 0 0;margin:1.5rem 0 0;background:none;color:inherit;}
.letter-guide .lt-further p {flex-basis:100%;font-size:.95rem;font-weight:700;margin:0;}
.letter-guide .lt-further a {display:inline-block;padding-block:.4rem;}
@media(max-width:640px) {
  .letter-guide .lt-annotation {grid-template-columns:minmax(0,1fr);gap:.34rem;}
  .letter-guide .lt-help {align-items:flex-start;}
  .letter-guide .lt-further {display:grid;}
  .letter-guide {padding-inline:clamp(.65rem,3.5vw,1rem);}
}