/* the shared look for every tool (Q-7 contrast, Q-8 no web fonts, legible at 320 px; the slot fixed-size and below the result) */
:root{--bg:#ffffff;--fg:#1a1a1a;--muted:#555;--line:#d8d8d8;--accent:#0b5cad;--accent-fg:#fff;--panel:#f4f6f8;--err-bg:#fff2f0;--err:#8a1c0f;--mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace}
@media (prefers-color-scheme:dark){:root{--bg:#121417;--fg:#ecedee;--muted:#b3b7bd;--line:#3a3f46;--accent:#7fb4f0;--accent-fg:#0b1a2b;--panel:#1b1f24;--err-bg:#3a1a14;--err:#ffb4a6}}
*{box-sizing:border-box}
[hidden]{display:none!important}
html{font-size:100%}
body{margin:0;background:var(--bg);color:var(--fg);font:1rem/1.55 system-ui,-apple-system,"Segoe UI",Roboto,Ubuntu,sans-serif}
a{color:var(--accent)}
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid var(--accent);outline-offset:2px}
.wrap{max-width:44rem;margin:0 auto;padding:0 16px}
header.site{border-bottom:1px solid var(--line)}
header.site .wrap{display:flex;gap:1rem;align-items:baseline;justify-content:space-between;padding:.6rem 16px}
header.site a{text-decoration:none;color:var(--fg);font-weight:600}
header.site nav a{font-weight:400;color:var(--accent);margin-left:1rem}
main{padding:1rem 0 2rem}
h1{font-size:1.6rem;line-height:1.25;margin:.5rem 0 .25rem}
.purpose{color:var(--muted);margin:0 0 1rem}
form.tool{display:grid;gap:.6rem;background:var(--panel);padding:1rem;border-radius:.5rem}
form.tool label{font-weight:600}
form.tool .hint{color:var(--muted);font-weight:400;font-size:.9rem}
form.tool input[type=text],form.tool input[type=number],form.tool select,form.tool textarea{width:100%;font:inherit;padding:.55rem .6rem;border:1px solid var(--line);border-radius:.35rem;background:var(--bg);color:var(--fg)}
form.tool textarea{min-height:12rem;font-family:var(--mono);font-size:.9rem}
form.tool .row{display:grid;gap:.6rem;grid-template-columns:repeat(auto-fit,minmax(10rem,1fr))}
form.tool .actions{display:flex;flex-wrap:wrap;gap:.5rem;align-items:center}
button{font:inherit;padding:.55rem 1rem;border-radius:.35rem;border:1px solid var(--accent);background:var(--accent);color:var(--accent-fg);cursor:pointer}
button.quiet{background:transparent;color:var(--accent)}
.examples{display:flex;flex-wrap:wrap;gap:.4rem;align-items:center;color:var(--muted);font-size:.9rem}
.examples button{padding:.2rem .5rem;font-size:.9rem;font-family:var(--mono)}
.error{background:var(--err-bg);color:var(--err);border-left:4px solid var(--err);padding:.6rem .8rem;margin:.8rem 0;border-radius:.25rem}
.result{margin:1rem 0;padding:1rem;border:1px solid var(--line);border-radius:.5rem}
.result-head{margin:0 0 .6rem;font-size:1.25rem;word-break:break-all}
.result dl{display:grid;grid-template-columns:minmax(8rem,12rem) 1fr;gap:.3rem .8rem;margin:0}
.result dt{color:var(--muted)}
.result dd{margin:0;word-break:break-all}
.mono{font-family:var(--mono);font-size:.95rem}
.notes{margin:.8rem 0 0;padding-left:1.2rem;color:var(--muted);font-size:.93rem}
.split{margin:.6rem 0}
.split-list{columns:2;column-gap:1.2rem;padding-left:1.2rem;margin:.3rem 0}
table.result-table{width:100%;border-collapse:collapse;font-size:.93rem}
table.result-table th,table.result-table td{text-align:left;padding:.35rem .4rem;border-bottom:1px solid var(--line);vertical-align:top}
.ok{color:#1f6b2a}.warn{color:#8a5a00}.bad{color:var(--err)}
@media (prefers-color-scheme:dark){.ok{color:#8fd49a}.warn{color:#f3c56b}}
/* the one ad slot (WT-D-5): fixed height reserved so the page never shifts, labelled, at least 150 px from any control, empty until W-9 */
.ad-slot{position:relative;min-height:280px;margin:2.5rem 0;display:flex;align-items:center;justify-content:center;border:1px dashed var(--line);border-radius:.5rem;color:var(--muted);font-size:.8rem}
.ad-slot:empty{display:none}
.ad-slot::before{content:attr(data-label);position:absolute;top:-1.3rem;left:0;font-size:.75rem;letter-spacing:.04em;text-transform:uppercase}
section.explain h2{font-size:1.2rem;margin:1.6rem 0 .4rem}
section.explain p{margin:.5rem 0}
.method{color:var(--muted);font-size:.85rem;border-top:1px solid var(--line);margin-top:1.5rem;padding-top:.6rem}
details.selftest{margin:1rem 0}
details.selftest pre{white-space:pre-wrap;font-size:.85rem;background:var(--panel);padding:.6rem;border-radius:.35rem}
footer.site{border-top:1px solid var(--line);color:var(--muted);font-size:.9rem}
footer.site .wrap{padding:1rem 16px;display:flex;flex-wrap:wrap;gap:.4rem 1.2rem}
@media (max-width:480px){.result dl{grid-template-columns:1fr}.result dt{margin-top:.4rem}.split-list{columns:1}header.site .wrap{flex-direction:column;gap:.2rem}}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}