:root{--accent: #0f766e;--accent-hover: #115e59;--accent-soft: #effaf8;--accent-border: #a7ddd6;--on-accent: #ffffff;--bg: #ffffff;--bg-subtle: #f6f8f9;--surface: #ffffff;--border: #e2e7eb;--border-strong: #c7d0d7;--text: #111827;--text-muted: #4b5563;--error: #b42318;--error-soft: #fef3f2;--notice: #7a4a07;--notice-soft: #fffaeb;--celebrate-soft: #fdf6e3;--celebrate-border: #f1d99b;--radius: 16px;--radius-sm: 10px;--shadow: 0 1px 2px rgba(16, 24, 40, .05), 0 10px 30px rgba(16, 24, 40, .07);--focus: 0 0 0 3px #ffffff, 0 0 0 5px var(--accent);--font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;color-scheme:light}*,*:before,*:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%;scroll-padding-top:72px}@media(prefers-reduced-motion:no-preference){html{scroll-behavior:smooth}}body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font);font-size:1rem;line-height:1.6;-webkit-font-smoothing:antialiased;overflow-wrap:break-word}img,svg{display:block;max-width:100%}a{color:var(--accent);text-underline-offset:2px}a:hover{color:var(--accent-hover)}:focus-visible{outline:none;box-shadow:var(--focus);border-radius:6px}h1,h2,h3{line-height:1.25;letter-spacing:-.01em;margin:0}code{font-family:var(--mono);font-size:.9em;background:var(--bg-subtle);border:1px solid var(--border);border-radius:6px;padding:.05em .35em}.small{font-size:.875rem}.muted{color:var(--text-muted)}.skip-link{position:absolute;left:16px;top:-48px;z-index:100;background:var(--text);color:#fff;padding:8px 14px;border-radius:8px;text-decoration:none}.skip-link:focus{top:12px;color:#fff}.container{width:100%;max-width:1160px;margin:0 auto;padding:0 16px}.container.narrow{max-width:780px}.site-header{position:sticky;top:0;z-index:10;background:var(--bg);border-bottom:1px solid var(--border)}.header-inner{display:flex;align-items:center;justify-content:space-between;gap:12px;height:60px}.brand{display:inline-flex;align-items:center;gap:8px;color:var(--text);font-weight:700;font-size:1.1rem;text-decoration:none}.brand:hover{color:var(--text)}.nav-links,.nav-mobile-links{list-style:none;margin:0;padding:0}.nav-links{display:flex;gap:4px}.nav-links a,.nav-mobile-links a{display:block;padding:8px 12px;border-radius:8px;color:var(--text-muted);text-decoration:none;font-weight:500;font-size:.95rem}.nav-links a:hover,.nav-mobile-links a:hover{color:var(--text);background:var(--bg-subtle)}.nav-links a[aria-current=page],.nav-mobile-links a[aria-current=page]{color:var(--accent);background:var(--accent-soft)}.nav-mobile{display:none;position:relative}.nav-mobile summary{display:inline-flex;align-items:center;gap:6px;min-height:44px;padding:0 12px;border:1px solid var(--border);border-radius:10px;cursor:pointer;list-style:none;font-weight:500;font-size:.95rem}.nav-mobile summary::-webkit-details-marker{display:none}.nav-mobile[open] summary{background:var(--bg-subtle)}.nav-mobile nav{position:absolute;right:0;top:calc(100% + 8px);min-width:220px;background:var(--surface);border:1px solid var(--border);border-radius:12px;box-shadow:var(--shadow);padding:6px}.nav-mobile-links a{padding:12px 14px;font-size:1rem}@media(max-width:720px){.nav-desktop{display:none}.nav-mobile{display:block}}.hero{background:linear-gradient(var(--bg-subtle),var(--bg));padding:36px 0 28px;border-bottom:1px solid var(--border)}.hero-copy{text-align:center;max-width:760px;margin:0 auto}.hero-copy h1{font-size:clamp(1.9rem,5.5vw,2.8rem);font-weight:800;letter-spacing:-.02em}.subtitle{margin:12px 0 0;font-size:clamp(1.1rem,2.6vw,1.3rem);font-weight:500}.lead{margin:10px auto 0;color:var(--text-muted);max-width:620px}.field{display:grid;gap:6px}.field label{font-weight:600}.field input,.field select,.field textarea{width:100%;min-height:52px;padding:10px 14px;font:inherit;font-size:1.05rem;color:var(--text);background:var(--surface);border:1px solid var(--border-strong);border-radius:var(--radius-sm);-webkit-appearance:none;appearance:none}.field input::-webkit-date-and-time-value{text-align:left}.field select{min-height:48px;font-size:1rem;padding-right:36px;background-image:linear-gradient(45deg,transparent 50%,var(--text-muted) 50%),linear-gradient(135deg,var(--text-muted) 50%,transparent 50%);background-position:calc(100% - 18px) 50%,calc(100% - 13px) 50%;background-size:5px 5px;background-repeat:no-repeat}.field textarea{min-height:84px;resize:vertical;font-size:1rem}.field input[type=range]{min-height:32px;padding:0;border:0;-webkit-appearance:auto;appearance:auto;accent-color:var(--accent)}.field input:focus-visible,.field select:focus-visible,.field textarea:focus-visible{border-color:var(--accent);box-shadow:0 0 0 3px #0f766e40}.field input[aria-invalid=true]{border-color:var(--error)}.field-hint{margin:0;font-size:.875rem;color:var(--text-muted)}.field-error{display:flex;align-items:flex-start;gap:8px;margin:0;padding:10px 12px;border-radius:var(--radius-sm);background:var(--error-soft);color:var(--error);font-size:.925rem;font-weight:500}.field-error svg{flex:none;margin-top:2px}.field-pair{display:grid;gap:16px}@media(min-width:560px){.field-pair{grid-template-columns:1fr 1fr;align-items:start}}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:10px 18px;border-radius:var(--radius-sm);border:1px solid transparent;font:inherit;font-weight:600;text-decoration:none;cursor:pointer}.btn-primary{background:var(--accent);color:var(--on-accent);font-size:1.05rem}.btn-primary:hover{background:var(--accent-hover);color:var(--on-accent)}.btn-secondary{background:var(--surface);color:var(--text);border-color:var(--border-strong)}.btn-secondary:hover{background:var(--bg-subtle)}.btn-ghost{background:transparent;color:var(--accent)}.btn-ghost:hover{background:var(--accent-soft)}.btn-block{width:100%}.privacy-note{display:flex;gap:8px;margin:0;font-size:.875rem;color:var(--text-muted)}.privacy-note svg{flex:none;width:16px;height:16px;margin-top:3px;color:var(--accent)}.table-wrap{overflow-x:auto}.data-table{width:100%;border-collapse:collapse;text-align:left;font-variant-numeric:tabular-nums;font-size:.95rem}.data-table th,.data-table td{padding:10px 12px;border-bottom:1px solid var(--border)}.data-table thead th{font-size:.8rem;text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted)}.tool-container{margin-top:28px}.tool{max-width:980px;margin:0 auto;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:8px 20px;text-align:left}#tool:focus{outline:none}.tool-step{display:grid;align-content:start;gap:14px;padding:20px 0;border-bottom:1px solid var(--border);min-width:0}.step-title{display:flex;align-items:center;gap:10px;font-size:1.15rem}.step-num{display:inline-grid;place-items:center;flex:none;width:28px;height:28px;border-radius:50%;background:var(--accent);color:var(--on-accent);font-size:.9rem}.spec-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px 14px;margin:0;padding:0;border:0;min-width:0}.spec-grid .field:first-of-type,.spec-grid .check-field{grid-column:1 / -1}.spec-grid .field input,.spec-grid .field select{min-height:46px}@media(min-width:720px){.spec-grid{grid-template-columns:1.4fr repeat(5,minmax(0,1fr))}.spec-grid .field:first-of-type{grid-column:auto}.spec-grid .field label{font-size:.875rem}}.check-field{display:flex;align-items:flex-start;gap:10px;font-size:.95rem;cursor:pointer}.check-field input{flex:none;width:20px;height:20px;margin:2px 0 0;accent-color:var(--accent)}.spec-summary{margin:0;padding:12px 14px;border-radius:var(--radius-sm);background:var(--accent-soft);border:1px solid var(--accent-border);font-size:.95rem}.paste-rules{border:1px dashed var(--border-strong);border-radius:var(--radius-sm)}.paste-rules summary{padding:12px 14px;cursor:pointer;font-weight:600;color:var(--accent)}.paste-body{display:grid;gap:12px;padding:0 14px 14px}.paste-body .btn{justify-self:start}.parse-report ul{margin:4px 0 8px;padding-left:20px}.parse-report p{margin:0 0 6px}.notice{margin:0;padding:10px 12px;border-radius:var(--radius-sm);background:var(--notice-soft);color:var(--notice)}.drop{display:grid;justify-items:center;gap:4px;padding:28px 16px;border:2px dashed var(--accent-border);border-radius:var(--radius);background:var(--accent-soft);color:var(--accent);text-align:center;cursor:pointer}.drop:hover,.drop-over{border-color:var(--accent)}.drop:focus-within{box-shadow:var(--focus)}.drop-compact{grid-template-columns:auto 1fr;justify-items:start;align-items:center;column-gap:10px;padding:12px 16px;text-align:left}.drop-compact .drop-hint{grid-column:2}.drop-text{font-weight:600;overflow-wrap:anywhere}.drop-hint{font-size:.85rem;color:var(--text-muted)}.tool-work{display:grid;border-bottom:1px solid var(--border)}.tool-work .tool-step{border-bottom:0}@media(min-width:760px){.tool-work{grid-template-columns:1fr 1fr;gap:32px}}.frame{display:grid;place-items:center;padding:16px;border-radius:var(--radius-sm);background:repeating-conic-gradient(#eef1f3 0% 25%,#f8f9fa 0% 50%) 50% / 20px 20px}.preview{width:auto;max-width:100%;max-height:340px;height:auto;min-height:120px;background:#fff;box-shadow:0 1px 4px #10182840;cursor:grab;touch-action:none}.preview:active{cursor:grabbing}.center{text-align:center;margin:0}.button-row{display:flex;flex-wrap:wrap;gap:4px}.button-row .btn{min-height:40px;padding:6px 12px;font-size:.95rem}.result-file{display:flex;align-items:center;gap:16px;margin-bottom:12px}.result-file img{flex:none;max-width:120px;max-height:140px;width:auto;height:auto;border:1px solid var(--border)}.result-size{margin:0;font-size:1.6rem;font-weight:800;font-variant-numeric:tabular-nums}.result-file .muted{margin:0}.checks{list-style:none;margin:0 0 14px;padding:0;display:grid;gap:6px;font-size:.925rem}.check{display:flex;gap:8px;align-items:flex-start}.check-icon{flex:none;display:inline-grid;place-items:center;width:22px;height:22px;border-radius:50%}.check-pass .check-icon{background:var(--accent-soft);color:var(--accent)}.check-warn .check-icon{background:var(--notice-soft);color:var(--notice)}.check-fail .check-icon{background:var(--error-soft);color:var(--error)}.ok-line{margin:10px 0 0;color:var(--accent-hover);font-weight:600}.is-busy{opacity:.6;cursor:progress}.spec-bytes{display:block;margin-top:4px;font-size:.85rem;color:var(--text-muted)}.checker{display:grid;align-content:start;gap:12px;padding:20px 0}.checker h3{font-size:1.05rem}.checker>p{margin:0}.check-report{display:grid;gap:8px}.check-report .btn{justify-self:start}.check-file-name{margin:0;overflow-wrap:anywhere}.visually-hidden{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}.prose{padding:40px 0 56px}.prose h1{font-size:clamp(1.8rem,5vw,2.4rem);margin-bottom:16px}.prose h2{font-size:1.5rem;margin:40px 0 12px}.prose section:first-child h2{margin-top:0}.prose h3{font-size:1.1rem;margin:24px 0 6px}.prose p,.prose li{color:#1f2937}.prose p{margin:0 0 14px}.prose ul,.prose ol{padding-left:1.3em;margin:0 0 14px}.prose li{margin-bottom:6px}.steps li::marker{font-weight:700;color:var(--accent)}.faq{margin-top:48px;padding-top:8px;border-top:1px solid var(--border)}.faq-item{padding:4px 0 8px;border-bottom:1px solid var(--border)}.faq-item h3{margin-top:18px}.info-page{padding-top:20px}.info-page .prose{padding-top:12px}.effective{color:var(--text-muted);font-size:.925rem}.contact-email{font-size:1.2rem;font-weight:600}.breadcrumbs ol{display:flex;flex-wrap:wrap;gap:6px;list-style:none;margin:0 0 12px;padding:0;font-size:.875rem;color:var(--text-muted)}.breadcrumbs li+li:before{content:"/";margin-right:6px;color:var(--border-strong)}.ad-slot{margin:32px 0;padding:8px 0;border-top:1px solid var(--border);border-bottom:1px solid var(--border);min-height:120px}.ad-slot:has(ins[data-ad-status=unfilled]){display:none}.ad-label{display:block;font-size:.7rem;text-transform:uppercase;letter-spacing:.08em;color:var(--text-muted);margin-bottom:4px}.site-footer{background:var(--bg-subtle);border-top:1px solid var(--border);padding:36px 0 28px;font-size:.925rem}.footer-inner{display:grid;gap:20px}.footer-brand{margin:0;font-weight:700;font-size:1.05rem}.footer-text{margin:4px 0 0;color:var(--text-muted)}.footer-links{display:flex;flex-wrap:wrap;gap:4px 18px;list-style:none;margin:0;padding:0}.footer-links a{display:inline-block;padding:6px 0;color:var(--text);text-decoration:none}.footer-links a:hover{color:var(--accent);text-decoration:underline}.footer-heading{margin:0 0 4px;font-weight:600;font-size:.85rem;text-transform:uppercase;letter-spacing:.04em;color:var(--text-muted)}.related-links{columns:2 220px;column-gap:24px}.related-links li{break-inside:avoid}.hero .breadcrumbs{margin-bottom:8px}.footer-copy{margin:0;color:var(--text-muted);font-size:.85rem}