:root{--bg:#fff;--surface:#f6f7f9;--surface-2:#eceef2;--text:#16191d;--text-muted:#4a5058;--accent:#0f5fb8;--accent-contrast:#fff;--danger:#b3261e;--success:#1a6b34;--warning:#8a5300;--border:#c9ced6;--border-strong:#6f747d;--focus:#0b57d0;--code-bg:#f2f3f6;--shadow:0 1px 2px #00000014, 0 4px 12px #0000000f;--step--1:.875rem;--step-0:1rem;--step-1:1.125rem;--step-2:1.375rem;--step-3:1.75rem;--step-4:2.25rem;--radius:.5rem;--space:1rem;--duration:.18s}:root[data-theme=dark]{--bg:#12151a;--surface:#1b1f26;--surface-2:#242a33;--text:#e8eaee;--text-muted:#a7aeb9;--accent:#7fb6f5;--accent-contrast:#0d1117;--danger:#ff9b93;--success:#7fd8a0;--warning:#f0c26a;--border:#333a45;--border-strong:#7c8593;--focus:#ffd166;--code-bg:#171b21;--shadow:0 1px 2px #00000080, 0 4px 16px #0006}*,:before,:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;font-size:var(--step-0);margin:0;line-height:1.6}h1,h2,h3,h4{text-wrap:balance;margin:0 0 .5em;line-height:1.25}h1{font-size:var(--step-4)}h2{font-size:var(--step-3)}h3{font-size:var(--step-2)}h4{font-size:var(--step-1)}p,ul,ol,dl{max-width:72ch}a{color:var(--accent);text-underline-offset:.15em}a:hover{text-decoration-thickness:.15em}img,svg{max-width:100%}code,pre,kbd,samp{font-family:ui-monospace,SFMono-Regular,Cascadia Mono,Consolas,Liberation Mono,monospace;font-size:.9em}kbd{background:var(--surface-2);border:1px solid var(--border-strong);white-space:nowrap;border-bottom-width:2px;border-radius:.25rem;padding:.05em .4em;font-size:.85em}:focus-visible{outline:3px solid var(--focus);outline-offset:2px;border-radius:2px}:focus:not(:focus-visible){outline:none}.sr-only,.sr-only-focusable:not(:focus):not(:focus-within){clip-path:inset(50%);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;position:absolute!important}.stack>*+*{margin-block-start:var(--space)}.skip-link{z-index:100;background:var(--accent);color:var(--accent-contrast);border-radius:var(--radius);padding:.6rem 1rem;font-weight:600;text-decoration:none;position:absolute;inset-block-start:.5rem;inset-inline-start:.5rem}.app-shell{grid-template-columns:minmax(16rem,22rem) minmax(0,1fr);gap:clamp(1rem,3vw,2.5rem);max-width:90rem;margin-inline:auto;padding:clamp(1rem,3vw,2rem);display:grid}.site-sidebar-cell{min-width:0}.site-sidebar{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);align-self:start;max-height:calc(100vh - 2rem);padding:1rem;position:sticky;top:1rem;overflow-y:auto}.site-header{border-bottom:1px solid var(--border);flex-wrap:wrap;grid-column:1/-1;justify-content:space-between;align-items:flex-end;gap:1rem;padding-block-end:1rem;display:flex}.site-header h1{font-size:var(--step-3);margin:0}.site-tagline{color:var(--text-muted);font-size:var(--step--1);margin:.25rem 0 0}.site-footer{border-top:1px solid var(--border);color:var(--text-muted);font-size:var(--step--1);grid-column:1/-1;padding-block-start:1rem}@media (width<=900px){.app-shell{grid-template-columns:minmax(0,1fr)}.site-sidebar{max-height:none;position:static}}.nav-list{margin:0;padding:0;list-style:none}.nav-list li+li{margin-block-start:.15rem}.nav-link{border-radius:var(--radius);color:var(--text);font-size:var(--step--1);border-inline-start:3px solid #0000;padding:.4rem .6rem;text-decoration:none;display:block}.nav-link:hover{background:var(--surface-2);text-decoration:underline}.nav-link[aria-current]{background:var(--surface-2);border-inline-start-color:var(--accent);font-weight:700}.sidebar-heading{font-size:var(--step--1);text-transform:uppercase;letter-spacing:.06em;color:var(--text-muted);margin:1.25rem 0 .5rem}input[type=text],input[type=search],input[type=email],input[type=number],input[type=password],select,textarea{font:inherit;color:var(--text);background:var(--bg);border:1px solid var(--border-strong);border-radius:var(--radius);width:100%;max-width:28rem;padding:.45rem .6rem}input[aria-invalid=true],textarea[aria-invalid=true],select[aria-invalid=true]{border-width:2px;border-color:var(--danger)}label{margin-block-end:.35rem;margin-inline-end:.6rem;font-weight:600;display:inline-block}.field{margin-block-end:1rem}.hint{color:var(--text-muted);font-size:var(--step--1);margin-block-end:.3rem;display:block}.field-error{color:var(--danger);font-size:var(--step--1);margin-block-start:.3rem;font-weight:600;display:block}fieldset{border:1px solid var(--border);border-radius:var(--radius);min-width:0;margin:0 0 1rem;padding:.75rem 1rem 1rem}legend{padding-inline:.35rem;font-weight:700}.btn{font:inherit;color:var(--text);background:var(--surface-2);border:1px solid var(--border-strong);border-radius:var(--radius);cursor:pointer;align-items:center;gap:.4rem;min-height:2.75rem;padding:.45rem .9rem;font-weight:600;display:inline-flex}.btn:hover{background:var(--border)}.btn-primary{background:var(--accent);color:var(--accent-contrast);border-color:var(--accent)}.btn-primary:hover{filter:brightness(1.08)}.btn-small{min-height:2.25rem;font-size:var(--step--1);padding:.3rem .6rem}.btn-icon{justify-content:center;min-width:2.75rem}.btn:disabled{opacity:.6;cursor:not-allowed}.pattern-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);margin-block-end:2.5rem;padding:clamp(1rem,2.5vw,1.75rem);scroll-margin-top:1.5rem}.pattern-card>h3{margin-block-start:0}.pattern-problem{color:var(--text-muted)}.pattern-section-heading{font-size:var(--step-0);text-transform:uppercase;letter-spacing:.06em;color:var(--text-muted);border-block-end:1px solid var(--border);margin:1.5rem 0 .5rem;padding-block-end:.25rem}.demo-stage{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);padding:1rem;overflow-x:auto}.demo-stage[data-variant=broken]{border-style:dashed;border-width:2px;border-color:var(--danger)}.variant-switch{border:1px solid var(--border);border-radius:var(--radius);flex-wrap:wrap;align-items:center;gap:1rem;margin-block-end:.75rem;padding:.5rem .75rem;display:flex}.variant-switch legend{font-size:var(--step--1);text-transform:uppercase;letter-spacing:.06em;color:var(--text-muted)}.variant-option{align-items:center;gap:.35rem;margin:0;font-weight:600;display:inline-flex}.variant-option input{width:auto;min-width:1rem;accent-color:var(--accent)}.broken-banner{background:var(--surface-2);border-inline-start:4px solid var(--danger);border-radius:var(--radius);font-size:var(--step--1);align-items:flex-start;gap:.5rem;max-width:none;margin-block-start:.75rem;padding:.6rem .9rem;display:flex}.note{background:var(--surface-2);border-inline-start:4px solid var(--accent);border-radius:var(--radius);font-size:var(--step--1);max-width:none;padding:.6rem .9rem}.note-warning{border-inline-start-color:var(--warning)}.criteria-list{max-width:none;margin:0;padding:0;list-style:none}.criteria-list li{border:1px solid var(--border);border-radius:var(--radius);background:var(--bg);margin-block-end:.5rem;padding:.6rem .8rem}.criterion-head{flex-wrap:wrap;align-items:baseline;gap:.5rem;display:flex}.criterion-number{font-variant-numeric:tabular-nums;font-weight:700}.badge{letter-spacing:.04em;border:1px solid var(--border-strong);white-space:nowrap;border-radius:999px;padding:.05rem .5rem;font-size:.75rem;font-weight:700;display:inline-block}.badge-level-A,.badge-level-AA{background:var(--surface-2)}.badge-level-AAA{background:0 0;font-style:italic}.criterion-why{color:var(--text-muted);font-size:var(--step--1);max-width:none;margin:.35rem 0 0}.code-block{background:var(--code-bg);border:1px solid var(--border);border-radius:var(--radius);position:relative}.code-block-toolbar{border-block-end:1px solid var(--border);font-size:var(--step--1);color:var(--text-muted);justify-content:space-between;align-items:center;gap:.5rem;padding:.35rem .5rem .35rem .75rem;display:flex}.code-block pre{max-height:32rem;margin:0;padding:.85rem;overflow:auto}.table-scroll{overflow-x:auto}table.data-table{border-collapse:collapse;width:100%;min-width:24rem}table.data-table caption{text-align:start;padding-block-end:.4rem;font-weight:700}table.data-table th,table.data-table td{border:1px solid var(--border);text-align:start;vertical-align:top;padding:.4rem .6rem}table.data-table thead th{background:var(--surface-2)}.search-field{margin-block-end:.5rem}.search-status{font-size:var(--step--1);color:var(--text-muted);min-height:1.5em}.checklist-group{border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);margin-block-end:1.25rem;padding:1rem}.checklist-item{border-block-end:1px dotted var(--border);grid-template-columns:auto minmax(0,1fr);align-items:start;gap:.6rem;padding:.4rem 0;display:grid}.checklist-item:last-child{border-block-end:none}.checklist-item input[type=checkbox]{width:1.15rem;height:1.15rem;accent-color:var(--accent);margin-block-start:.35rem}.checklist-item label{margin:0;font-weight:500}.checklist-meta{font-size:var(--step--1);color:var(--text-muted);display:block}.progress-line{font-weight:700}@media print{.site-sidebar,.site-header .header-tools,.skip-link,.no-print{display:none!important}.app-shell{max-width:none;padding:0;display:block}body{color:#000;background:#fff;font-size:11pt}.checklist-group{break-inside:avoid;background:0 0;border-color:#666}a:after{content:" (" attr(href) ")";word-break:break-all;font-size:9pt}}@media (prefers-reduced-motion:reduce){:root{--duration:0s}*,:before,:after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}}