:root{--bg:#f8fafc;--surface:#fff;--text:#0f172a;--muted:#475569;--border:#e2e8f0;--brand:#4f46e5;--brand-dark:#4338ca;--radius:14px;--shadow:0 10px 30px rgba(15,23,42,.08);--max:1100px;--header:64px}
*,*::before,*::after{box-sizing:border-box}
[hidden]{display:none!important}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important;animation:none!important}}
[id]{scroll-margin-top:calc(var(--header) + 16px)}
body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.7;font-size:17px}
a{color:var(--brand)}a:hover{color:var(--brand-dark)}
a:focus-visible{outline:3px solid #c7d2fe;outline-offset:2px;border-radius:4px}
img,svg{max-width:100%;height:auto}
h1,h2,h3{line-height:1.25}
.container{width:min(100% - 32px,var(--max));margin-inline:auto}
.skip{position:absolute;left:-999px;top:8px}
.skip:focus{left:16px;background:#fff;padding:8px 12px;z-index:100;border-radius:6px}
.center{text-align:center}

/* Header */
.site-header{background:var(--surface);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:50}
.header-inner{display:flex;align-items:center;justify-content:space-between;min-height:var(--header);gap:16px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;color:var(--text);text-decoration:none}
.nav ul{display:flex;gap:18px;list-style:none;margin:0;padding:0}
.nav a{display:inline-block;padding:8px 2px;color:var(--muted);text-decoration:none;font-weight:500;font-size:15px}
.nav a:hover,.nav a[aria-current=page]{color:var(--brand)}
.nav a[aria-current=page]{font-weight:700}
.nav-toggle{display:none;background:none;border:1px solid var(--border);border-radius:8px;font-size:20px;min-width:44px;min-height:44px;cursor:pointer}
@media(max-width:900px){
  .nav-toggle{display:block}
  .nav{display:none;position:absolute;top:var(--header);left:0;right:0;background:var(--surface);border-bottom:1px solid var(--border);padding:8px 16px 12px}
  .nav.open{display:block}
  .nav ul{flex-direction:column;gap:2px}
  .nav a{display:block;padding:10px 0}
}

/* Hero */
.hero{background:linear-gradient(180deg,#eef2ff 0%,var(--bg) 100%);padding:44px 0 18px;text-align:center}
.hero h1{font-size:clamp(2rem,5vw,3.2rem);margin:0 0 14px}
.lead{max-width:780px;margin:0 auto 14px;color:var(--muted);font-size:1.1rem}
.honest{max-width:780px;margin:0 auto 16px;background:#fffbeb;border:1px solid #fde68a;border-radius:10px;padding:10px 14px;font-size:15px;text-align:left;color:var(--text)}
.badges{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;list-style:none;padding:0;margin:0}
.badges li{background:#fff;border:1px solid var(--border);border-radius:999px;padding:4px 14px;font-size:14px;color:var(--muted)}
@media(max-width:640px){
  .hero{padding:24px 0 8px}
  .lead{font-size:1rem;margin-bottom:10px}
  .badges{display:none}
}

/* Tool */
.tool{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px;margin:16px auto 48px}
.tool h2{margin-top:0}
.lbl{display:block;font-weight:600;margin:12px 0 6px}
textarea,select,input{font:inherit;font-size:16px;color:var(--text)}
textarea{width:100%;padding:12px;border:1px solid var(--border);border-radius:10px;resize:vertical;background:#fff;unicode-bidi:plaintext}
textarea:focus,select:focus,input:focus,button:focus-visible,summary:focus-visible{outline:3px solid #c7d2fe;outline-offset:2px}
#output{background:#f8fafc}
.counts{color:var(--muted);font-size:14px;margin:6px 0 12px}
.options{border:1px solid var(--border);border-radius:10px;padding:12px 16px;margin:0 0 16px;display:grid;gap:8px}
.options legend{font-weight:600;padding:0 6px}
.options label{font-size:15px}
select{padding:6px 8px;border:1px solid var(--border);border-radius:8px;font-size:16px;margin-left:6px;background:#fff}
.actions{display:flex;flex-wrap:wrap;gap:10px;margin:10px 0}
.btn{display:inline-block;padding:10px 18px;min-height:44px;border:0;border-radius:8px;background:var(--brand);color:#fff;font:inherit;font-size:15px;font-weight:600;cursor:pointer;text-decoration:none}
.btn:hover{background:var(--brand-dark);color:#fff}
.btn-secondary{background:#0f172a}.btn-secondary:hover{background:#1e293b}
.btn-ghost{background:#fff;color:var(--text);border:1px solid var(--border)}.btn-ghost:hover{background:#f1f5f9;color:var(--text)}
.btn[disabled]{opacity:.6;cursor:wait}
.status{min-height:1.5em;font-weight:600;color:#15803d;margin:4px 0}
.warn{color:#b91c1c}
.note{background:#fffbeb;border:1px solid #fde68a;border-radius:10px;padding:12px 16px;font-size:15px;margin:18px 0 0}
.report{margin-top:18px;border:1px solid var(--border);border-radius:10px;padding:14px 16px;background:#f8fafc}
.report p{margin:.3em 0}
.table-wrap{overflow-x:auto}
table{border-collapse:collapse;width:100%;margin-top:10px;font-size:14px}
th,td{border:1px solid var(--border);padding:6px 10px;text-align:left;vertical-align:top}
th{background:#f1f5f9}
.legend{display:flex;flex-wrap:wrap;gap:14px;list-style:none;padding:0;margin:0 0 10px;font-size:14px}
.viz{border:1px solid var(--border);border-radius:10px;padding:12px;white-space:pre-wrap;word-break:break-word;line-height:2;background:#fff;max-height:340px;overflow:auto;font-size:15px;unicode-bidi:plaintext}
.vis{color:#64748b}
mark{border-radius:4px;padding:1px 5px;font:600 11px/1 ui-monospace,Menlo,Consolas,monospace;color:#0f172a}
mark.kept{outline:2px dashed #64748b;outline-offset:1px}
.c-zw{background:#fde68a}.c-sp{background:#bfdbfe}.c-bidi{background:#e9d5ff}.c-other{background:#fecaca}.c-ctrl{background:#fed7aa}

/* Sections */
.features{margin-bottom:48px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:16px}
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px}
a.card{display:block;text-decoration:none;color:var(--text)}
a.card:hover{border-color:var(--brand);color:var(--text)}
.card h3{margin:0 0 6px;font-size:1.05rem}
.card p{margin:0;color:var(--muted);font-size:15px}
.more-tools{margin-bottom:48px}
.article{max-width:820px;margin:0 auto 48px}
.article h2{margin-top:2.2em;font-size:1.6rem}
.article h3{margin-top:1.6em;font-size:1.2rem}
.article li{margin-bottom:.5em}
.meta{color:var(--muted);font-size:14px;margin:0 0 16px}
.toc{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:16px 24px;margin-bottom:24px}
.toc-title{font-weight:700;margin:0 0 6px}
.toc ol{margin:0;padding-left:20px;columns:2;column-gap:32px}
@media(max-width:640px){.toc ol{columns:1}}
pre{background:#0f172a;color:#e2e8f0;padding:14px 16px;border-radius:10px;overflow-x:auto;font:14px/1.55 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;margin:12px 0}
code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;background:#f1f5f9;padding:1px 5px;border-radius:4px;font-size:.92em}
pre code{background:none;padding:0;font-size:inherit}
.faq{max-width:820px;margin:0 auto 48px}
.faq details{background:var(--surface);border:1px solid var(--border);border-radius:10px;margin:0 0 10px;padding:0 18px}
.faq summary{cursor:pointer;padding:14px 0;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";float:right;font-size:1.4rem;line-height:1;color:var(--brand)}
.faq details[open] summary::after{content:"\2212"}
.faq summary h3{display:inline;font-size:1rem;margin:0}
.faq details p{margin:0 0 16px;color:var(--muted)}
.conclusion{max-width:820px;margin:0 auto 64px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:24px 28px}
.conclusion h2{margin-top:0}

/* Inner pages */
.page{max-width:820px;margin:40px auto 64px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:32px}
@media(max-width:640px){.page{padding:20px;margin:20px auto 40px}}
.page h1{margin-top:0}
.page h2{margin-top:1.8em;font-size:1.3rem}
.crumbs{font-size:14px;color:var(--muted);margin:0 0 16px}
.contact-form{display:grid;gap:12px;margin-top:16px}
.contact-form input,.contact-form textarea{width:100%;padding:10px;border:1px solid var(--border);border-radius:8px}
.hp{position:absolute;left:-9999px}
.fine{font-size:14px;color:var(--muted)}

/* Footer */
.site-footer{background:#0f172a;color:#cbd5e1;padding:40px 0 20px;font-size:15px}
.site-footer a{color:#e2e8f0}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.4fr;gap:32px}
@media(max-width:900px){.footer-grid{grid-template-columns:1fr 1fr}}
@media(max-width:560px){.footer-grid{grid-template-columns:1fr}}
.foot-title{font-weight:700;color:#fff;margin:0 0 8px}
.site-footer ul{list-style:none;margin:0;padding:0}
.site-footer li{margin-bottom:6px}
.footer-bottom{border-top:1px solid #1e293b;margin-top:28px;padding-top:16px;font-size:13px;color:#94a3b8}
.footer-bottom p{margin:.3em 0}