*{box-sizing:border-box}
body{margin:0}
button,input,select,textarea{font:inherit}
button{cursor:pointer}
button:disabled{opacity:.45;cursor:not-allowed}
h1{font-size:clamp(28px,3vw,44px);line-height:1.13;letter-spacing:-1.6px;font-weight:650;margin:14px 0}
h2{font-size:18px;font-weight:600;margin:0 0 10px}
p{margin:8px 0;color:var(--muted)}
input:not([type=checkbox]):not([type=color]),select,textarea{width:100%;padding:10px 12px;min-width:0}
textarea{font:13px/1.6 ui-monospace,Consolas,monospace;resize:vertical}
input[aria-invalid=true]{border-color:var(--danger)!important;outline-color:var(--danger)}
input[type=color]{width:46px;height:42px;padding:3px;border:1px solid var(--line);border-radius:9px;background:var(--bg);cursor:pointer;flex:none}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.muted{color:var(--muted)}.small{font-size:12px}
.intro{max-width:760px;margin-bottom:22px}
.intro p:not(.eyebrow){font-size:15px}
.note{font-size:12px;margin-top:28px}
.status{min-height:1.4em;font-size:13px;margin:0 0 14px}
.status:empty{display:none}
.status.error{color:var(--danger)}
.panel{border:1px solid var(--line);border-radius:14px;padding:23px;background:var(--panel);margin:0 0 18px;min-width:0}
.panel-head{display:flex;justify-content:space-between;align-items:baseline;gap:12px}
.row{display:flex;gap:9px;align-items:center;flex-wrap:wrap}
.toolbar{padding:4px 0 16px;margin-bottom:16px;border-bottom:1px solid var(--line)}
.field{display:grid;gap:7px;margin:12px 0;color:var(--muted);font-size:13px;flex:1;min-width:160px}
.field.narrow{max-width:360px}
.colour-field{display:grid;gap:7px;margin:0 0 14px;font-size:13px;color:var(--muted)}
.colour-field label{color:var(--text);font-weight:600}
.colour-row{display:flex;gap:8px;align-items:center}
.colour-field select,.panel>select{margin:-4px 0 16px}
.hint{font-size:11px}
.checkbox{display:flex;align-items:center;gap:10px;font-size:13px}
.checkbox input{width:18px;height:18px;accent-color:#467bef}

/* Home */
.strip{display:flex;height:56px;border-radius:10px;overflow:hidden;border:1px solid var(--line)}
.strip span{flex:1}
.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:15px}
.feature{display:flex;flex-direction:column;align-items:flex-start;gap:4px;padding:23px;text-align:left;border-radius:14px;min-height:140px;background:var(--panel)}
.feature-icon{color:var(--accent);margin-bottom:8px}
.feature strong{font-size:16px}
.feature span:last-child{font-size:12px;color:var(--muted)}

/* Contrast */
.contrast-layout{display:grid;grid-template-columns:minmax(260px,340px) minmax(0,1fr);gap:18px;align-items:start}
.ratio-row{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:12px}
.ratio{display:block;font:650 clamp(34px,4vw,52px)/1.1 Inter,system-ui,sans-serif;letter-spacing:-1.5px}
.grade{font-size:12px;font-weight:700;letter-spacing:1px;text-transform:uppercase;border-radius:20px;padding:6px 12px;border:1px solid var(--line);white-space:nowrap}
.grade.small{font-size:10px;padding:2px 7px;letter-spacing:.5px}
.grade[data-grade=aaa],.grade[data-grade=aa]{color:#40cfaa;border-color:#2f8f78}
.grade[data-grade=aa-large]{color:#ffc46b;border-color:#8c6a2f}
.grade[data-grade=fail]{color:var(--danger);border-color:color-mix(in srgb,var(--danger) 55%,var(--line))}
:root[data-theme=light] .grade[data-grade=aaa],:root[data-theme=light] .grade[data-grade=aa]{color:#0b6b52;border-color:#2f8f78}
:root[data-theme=light] .grade[data-grade=aa-large]{color:#7a4b00;border-color:#b98b3a}
.checks{list-style:none;padding:0;margin:0 0 18px;display:grid;gap:6px}
.checks li{display:grid;grid-template-columns:22px 1fr auto auto;gap:10px;align-items:center;padding:9px 12px;border-radius:9px;background:var(--bg);font-size:13px}
.checks .need{color:var(--muted);font-size:12px}
.checks .pass .mark,.checks .pass b{color:#40cfaa}
.checks .fail .mark,.checks .fail b{color:var(--danger)}
:root[data-theme=light] .checks .pass .mark,:root[data-theme=light] .checks .pass b{color:#0b6b52}
.sample{border:1px solid var(--line);border-radius:12px;padding:22px;margin-bottom:18px}
.sample p{color:inherit;margin:0 0 10px}
.sample-normal{font-size:16px}
.sample-large{font-size:24px;font-weight:700;letter-spacing:-.3px}
.sample-ui{display:flex;gap:14px;align-items:center;flex-wrap:wrap}
.sample-button{border:2px solid;border-radius:8px;padding:7px 14px;font-weight:600}
.sample-small{font-size:12px}
.fixes h2{margin-top:6px}
.fix-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:8px}
.fix{font-family:ui-monospace,Consolas,monospace;font-size:12px}

/* Palette */
.controls{display:grid;grid-template-columns:minmax(220px,1fr) minmax(200px,1fr);gap:0 20px;align-items:end}
.controls .colour-field,.controls .field{margin:0 0 14px}
.controls .row{grid-column:1/-1}
.swatches{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:16px;margin-top:12px}
.swatch{border:1px solid var(--line);border-radius:14px;background:var(--panel);overflow:hidden;min-width:0}
.swatch.locked{border-color:var(--focus);box-shadow:0 0 0 1px var(--focus)}
.chip{height:96px;border-bottom:1px solid var(--line)}
.swatch-body{padding:14px;display:grid;gap:9px}
.formats{font:11px/1.6 ui-monospace,Consolas,monospace;margin:0;overflow-wrap:anywhere}
.swatch-actions{display:flex;flex-wrap:wrap;gap:6px}
.swatch-actions button{padding:6px 9px;font-size:12px}
.swatch-actions button[aria-pressed=true]{background:var(--raised);border-color:var(--focus);color:var(--text)}

/* Grid */
.grid-wrap{overflow:auto;border:1px solid var(--line);border-radius:14px;background:var(--panel)}
.grid-table{border-collapse:collapse;min-width:100%}
.grid-table th,.grid-table td{padding:10px;border-bottom:1px solid var(--line);border-right:1px solid var(--line);text-align:center;font-size:12px;vertical-align:top}
.grid-table th{font-weight:600;white-space:nowrap;color:var(--text)}
.grid-table th small{display:block;color:var(--muted);font-family:ui-monospace,Consolas,monospace;font-weight:400}
.grid-table thead th{position:sticky;top:0;background:var(--panel)}
.grid-table tbody th{text-align:left;position:sticky;left:0;background:var(--panel)}
.dot{display:inline-block;width:12px;height:12px;border-radius:50%;border:1px solid var(--line);margin-right:6px;vertical-align:-1px}
.cell{width:70px;height:48px;border-radius:8px;display:grid;place-items:center;margin:0 auto 6px;border:1px solid var(--line)}
.aa{font-size:20px;font-weight:700}
.cell-ratio{display:block;font-family:ui-monospace,Consolas,monospace;margin-bottom:4px}
.same,.hidden-cell{color:var(--muted);background:var(--bg)}

/* Vision */
.vision-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;margin-top:8px}
.vision-grid .strip{margin-bottom:6px}
.vision-list{list-style:none;padding:0;margin:14px 0 0;display:grid;gap:4px;font:12px/1.7 ui-monospace,Consolas,monospace;color:var(--muted)}
.vision-pair{border:1px solid var(--line);border-radius:12px;padding:20px;margin-bottom:12px;display:grid;gap:4px}
.vision-pair strong{font-size:18px}

/* Export */
.fields{align-items:flex-start}
.svg-preview{margin:6px 0 14px}
.svg-preview img{max-width:100%;max-height:260px;border-radius:10px;border:1px solid var(--line);display:block}
.panel textarea{margin-bottom:14px}

/* Saved */
.saved-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px}
.saved-card{border:1px solid var(--line);border-radius:14px;background:var(--panel);padding:16px;display:grid;gap:12px;min-width:0}
.saved-body{display:grid;gap:2px;overflow-wrap:anywhere}
.saved-card .row button{padding:6px 10px;font-size:12px}
.empty{grid-column:1/-1;border:1px dashed var(--line);border-radius:14px;padding:40px 20px;text-align:center;display:grid;gap:6px}

/* Dialog */
dialog{max-width:min(640px,92vw);width:640px;padding:26px;max-height:90vh}
dialog::backdrop{background:#000a}
dialog h2{font-size:22px}
dialog label{display:block;margin-bottom:8px;font-size:13px}
.dialog-actions{display:flex;gap:10px;justify-content:flex-end;margin-top:22px;flex-wrap:wrap}
[hidden]{display:none!important}

@media(max-width:1000px){.feature-grid{grid-template-columns:repeat(2,1fr)}.contrast-layout{grid-template-columns:1fr}}
@media(max-width:680px){.feature-grid{grid-template-columns:1fr;gap:10px}.feature{min-height:0;padding:16px}.panel{padding:17px}.controls{grid-template-columns:1fr}.vision-grid{grid-template-columns:1fr}.checks li{grid-template-columns:22px 1fr auto}.checks .need{display:none}.swatches{grid-template-columns:1fr}h1{letter-spacing:-1px}}
@media(prefers-reduced-motion:reduce){*{transition:none!important}}