/* Ironstrike brand tokens (copied from ironstrike-ai/index.html). Zero dependencies. */
:root{--bg:#0a0a0b;--panel:#141416;--steel-line:#38393e;--text:#eae8e4;--dim:#9a9a9f;--ember:#f5821f;--ember-bright:#ff9e42}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--text);font:16px/1.5 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;min-height:100vh;display:flex;flex-direction:column}
.wrap{width:100%;max-width:760px;margin:0 auto;padding:24px 16px}
main.wrap{flex:1}
h1{font-size:2rem;line-height:1.15;margin:0 0 8px}
p{margin:0 0 12px}
a{color:var(--ember-bright)}
.lede{color:var(--dim)}
button,.btn{min-height:44px;min-width:44px;padding:10px 20px;font:inherit;font-weight:600;color:#0a0a0b;background:var(--ember);border:0;border-radius:8px;cursor:pointer}
button:focus-visible,a:focus-visible{outline:3px solid var(--ember-bright);outline-offset:2px}
.is-footer{border-top:1px solid var(--steel-line);color:var(--dim);font-size:.875rem;padding:16px;max-width:760px;margin:0 auto;width:100%}
.is-footer p{margin:0 0 8px}
.is-footer a{padding:14px 6px;margin:-14px -6px}
@media (min-width:820px){.wrap{padding:40px 24px}h1{font-size:2.6rem}}
@media (min-width:1440px){.wrap{max-width:1100px}}
/* decfrac */
h2{font-size:1.15rem;margin:0 0 12px}
.grid{display:grid;gap:16px;margin-top:16px}
.card{background:var(--panel);border:1px solid var(--steel-line);border-radius:10px;padding:16px;min-width:0}
label{display:block;font-weight:600;margin-bottom:6px}
input[type=text]{width:100%;min-height:48px;padding:10px 12px;font:inherit;font-size:1.125rem;color:var(--text);background:var(--bg);border:1px solid var(--steel-line);border-radius:8px}
input[type=text]:focus-visible{outline:3px solid var(--ember-bright);outline-offset:1px}
.pair{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0}
.chip{min-height:44px;padding:8px 14px;color:var(--text);background:transparent;border:1px solid var(--steel-line);font-weight:500}
.msg{min-height:1.5em;color:var(--dim);margin:8px 0}
.msg.bad{color:var(--ember-bright)}
.out p{overflow-wrap:anywhere}
.big{font-size:1.9rem;font-weight:700;line-height:1.2;color:var(--ember-bright);margin:4px 0 8px}
.note{color:var(--dim)}
summary{min-height:44px;display:flex;align-items:center;cursor:pointer;color:var(--ember-bright);font-weight:600}
ol{margin:0 0 8px;padding-left:20px;overflow-wrap:anywhere}
li{margin-bottom:8px}
.facts{margin-top:24px;max-width:640px}
.facts p{color:var(--dim)}
@media (min-width:820px){.grid{grid-template-columns:1fr 1fr;align-items:start;gap:24px}.card{padding:24px}}