.check-pattern-tool{--ink:#153e49;--muted:#436772;--blue:#0D6EFD;--teal:#e7f8f4;--surface:#eefaf7;--surface-deep:#d9efea;--border:#b1d8d0;box-sizing:border-box;width:100%;max-width:1200px;margin:22px auto;padding:clamp(14px,2.5vw,27px);background:var(--teal);border:1px solid var(--border);border-radius:18px;color:var(--ink);font:400 16px/1.55 system-ui,-apple-system,"Segoe UI",sans-serif}
.check-pattern-tool *,.check-pattern-tool *::before,.check-pattern-tool *::after{box-sizing:border-box}
.check-pattern-tool [hidden]{display:none!important}
.check-pattern-tool h2,.check-pattern-tool h3{color:#153d49;line-height:1.3;margin:0 0 12px}
.check-pattern-tool h2{font-size:clamp(1.7rem,3.1vw,2.45rem)}
.check-pattern-tool h3{font-size:clamp(1.13rem,2vw,1.4rem)}
.check-pattern-tool p{margin:0 0 14px}
.check-pattern-tool header{margin-bottom:18px}
.check-pattern-tool .intro,.check-pattern-tool .help,.check-pattern-tool .details{color:var(--muted)}
.check-pattern-tool nav{background:var(--surface-deep);padding:12px 14px;border-radius:10px;margin-bottom:20px}
.check-pattern-tool nav a{display:inline-block;margin:3px 15px 3px 0;color:#0756bd;font-weight:650;text-decoration:underline;text-underline-offset:3px}
.check-pattern-tool .generator,.check-pattern-tool .result,.check-pattern-tool .guide,.check-pattern-tool .tips{padding:clamp(15px,2.5vw,27px);background:var(--surface);border:1px solid var(--border);border-radius:15px;margin-bottom:19px}
.check-pattern-tool .field-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.check-pattern-tool .field{min-width:0}
.check-pattern-tool label{display:block;font-weight:650;margin-bottom:6px}
.check-pattern-tool select,.check-pattern-tool input[type=number],.check-pattern-tool input[type=search]{display:block;width:100%;height:46px;border:1px solid #91c2b9;border-radius:8px;padding:8px 11px;background:#e6f7f3;color:var(--ink);font:inherit}
.check-pattern-tool input[type=color]{display:block;width:100%;height:46px;padding:3px;border:1px solid #91c2b9;border-radius:8px;background:#e6f7f3;cursor:pointer}
.check-pattern-tool .colour-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
.check-pattern-tool .colour-title{margin:24px 0 12px}
.check-pattern-tool .help{font-size:.85rem;margin:5px 0 0}
.check-pattern-tool .actions{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;max-width:830px;margin:25px auto 0}
.check-pattern-tool button{min-width:0;min-height:46px;padding:10px 12px;border-radius:9px;border:1px solid #0D6EFD;font:650 1rem/1.25 system-ui,-apple-system,"Segoe UI",sans-serif;cursor:pointer}
.check-pattern-tool .generate-btn,.check-pattern-tool .download-btn{background:#0D6EFD;color:#edf9f6}
.check-pattern-tool .refresh-btn{background:#d0ece6;border-color:#7aaca3;color:var(--ink)}
.check-pattern-tool button:disabled{background:#bddbd5;border-color:#a9c9c2;color:#496b70;cursor:not-allowed;opacity:.78}
.check-pattern-tool button:not(:disabled):hover{filter:brightness(.94)}
.check-pattern-tool :is(button,input,select,a):focus-visible{outline:3px solid #0D6EFD;outline-offset:3px}
.check-pattern-tool .status{min-height:1.4em;text-align:center;margin:12px 0 0;color:var(--muted);font-size:.93rem}
.check-pattern-tool .preview-layout{display:grid;grid-template-columns:minmax(0,1.55fr) minmax(240px,1fr);gap:22px;align-items:start}
.check-pattern-tool .preview{margin:0}
.check-pattern-tool .preview canvas{display:block;width:100%;height:auto;background:#dbefe9;border:1px solid #91bdb6;border-radius:10px}
.check-pattern-tool figcaption{color:var(--muted);font-size:.9rem;margin-top:7px}
.check-pattern-tool .table-wrap{overflow-x:auto;width:100%}
.check-pattern-tool table{width:100%;border-collapse:collapse;text-align:left;font-size:.93rem}
.check-pattern-tool th,.check-pattern-tool td{padding:9px;border-bottom:1px solid var(--border);vertical-align:middle}
.check-pattern-tool th{font-weight:650;color:#26505a}
.check-pattern-tool .reference-table{margin-top:21px}
.check-pattern-tool .reference-table input[type=color]{display:inline-block;width:44px;height:30px;padding:1px;vertical-align:middle;cursor:default}
.check-pattern-tool .reference-table input[type=color]:disabled{opacity:1}
.check-pattern-tool .details{font-size:.9rem;margin-top:14px}
.check-pattern-tool footer{border-top:1px solid var(--border);padding-top:17px;font-size:.89rem;color:var(--muted)}
.check-pattern-tool footer p{margin:0 0 8px}
@media(max-width:790px){.check-pattern-tool .field-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.check-pattern-tool .colour-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.check-pattern-tool .preview-layout{grid-template-columns:1fr}}
@media(max-width:500px){.check-pattern-tool{margin:10px auto}.check-pattern-tool .field-grid{grid-template-columns:1fr}.check-pattern-tool .actions{grid-template-columns:repeat(2,minmax(0,1fr));gap:9px}.check-pattern-tool button{font-size:.88rem;padding:9px 4px}.check-pattern-tool nav a{font-size:.92rem;margin-right:8px}}
.check-pattern-tool .question{font-size:1rem;margin:16px 0 4px;color:#244e5c}
.check-pattern-tool .guide .table-wrap{margin:14px 0 20px}
.check-pattern-tool .guide tbody tr:nth-child(even){background:#e0f3ef}