:root{
  --bg:#f6f8fb;
  --surface:#ffffff;
  --surface-2:#eef4fb;
  --ink:#142033;
  --muted:#5a6678;
  --line:#d9e2ee;
  --navy:#10243f;
  --blue:#1f6fb2;
  --teal:#148f91;
  --amber:#d8901f;
  --green:#207a4a;
  --red:#b24235;
  --shadow:0 18px 50px rgba(16,36,63,.10);
  --radius:22px;
  --max:1500px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;background:var(--bg);color:var(--ink);line-height:1.65;font-size:17px;overflow-x:hidden}
a{color:var(--blue);text-decoration-thickness:.08em;text-underline-offset:.18em}
a:hover{color:#164f83}
img,svg,video{max-width:100%;height:auto}
.wrap{width:min(var(--max),calc(100% - 40px));margin-inline:auto}
.skip-link{position:absolute;left:-999px;top:auto;width:1px;height:1px;overflow:hidden}
.skip-link:focus{left:20px;top:20px;width:auto;height:auto;padding:10px 14px;background:#fff;border:2px solid var(--blue);z-index:99;border-radius:10px}
.site-header{background:rgba(255,255,255,.95);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20;backdrop-filter:blur(10px)}
.topbar{display:flex;align-items:center;justify-content:space-between;gap:18px;padding:14px 0;flex-wrap:wrap}
.brand,.footer-brand{display:flex;align-items:center;gap:12px;color:var(--ink);text-decoration:none;min-width:0}
.brand strong{display:block;font-size:1.1rem;line-height:1.15}
.brand small{display:block;color:var(--muted);font-size:.82rem;line-height:1.25;margin-top:2px}
.site-nav{display:flex;align-items:center;gap:8px;flex-wrap:wrap;justify-content:flex-end}
.site-nav a{display:inline-flex;align-items:center;min-height:40px;padding:8px 12px;border-radius:999px;text-decoration:none;color:var(--ink);font-weight:700;font-size:.95rem}
.site-nav a:hover,.site-nav a[aria-current="page"]{background:var(--surface-2);color:var(--navy)}
.hero{background:linear-gradient(135deg,#10243f 0%,#1b4f7d 56%,#148f91 100%);color:#fff;padding:72px 0 58px;position:relative;overflow:hidden}
.hero:after{content:"";position:absolute;inset:auto -120px -220px auto;width:520px;height:520px;border-radius:50%;background:rgba(255,255,255,.12)}
.hero-grid{display:grid;grid-template-columns:minmax(0,1.07fr) minmax(320px,.93fr);gap:38px;align-items:center;position:relative;z-index:1}
.eyebrow{display:inline-flex;gap:8px;align-items:center;padding:7px 11px;border-radius:999px;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.25);font-weight:800;font-size:.9rem;letter-spacing:.01em}
h1{font-size:clamp(2.15rem,5vw,4.55rem);line-height:1.03;margin:.55em 0 .25em;letter-spacing:-.045em}
.hero p.lead{font-size:clamp(1.08rem,2.3vw,1.42rem);max-width:760px;color:#e8f2ff;margin:0 0 24px}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:24px}
.button{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:12px 18px;border-radius:999px;font-weight:800;text-decoration:none;border:1px solid transparent;cursor:pointer;font-size:1rem}
.button.primary{background:#fff;color:var(--navy)}
.button.secondary{background:rgba(255,255,255,.1);color:#fff;border-color:rgba(255,255,255,.35)}
.button.tertiary{background:var(--navy);color:#fff}
.button.light{background:#fff;color:var(--navy);border-color:var(--line)}
.tool-card-hero{background:rgba(255,255,255,.97);color:var(--ink);border-radius:28px;padding:26px;box-shadow:var(--shadow)}
.tool-card-hero h2{margin-top:0;font-size:1.55rem;line-height:1.2}
.check-list{list-style:none;margin:18px 0 0;padding:0;display:grid;gap:9px}
.check-list li{display:flex;gap:10px;align-items:flex-start}
.check-list li:before{content:"✓";display:inline-grid;place-items:center;width:24px;height:24px;border-radius:50%;background:#e4f7ef;color:var(--green);font-weight:900;flex:0 0 auto;margin-top:2px}
.section{padding:56px 0}
.section.tight{padding:36px 0}
.section-title{max-width:920px;margin-bottom:26px}
.section-title h2{font-size:clamp(1.75rem,3.2vw,2.6rem);line-height:1.1;margin:.2em 0;letter-spacing:-.03em}
.section-title p{color:var(--muted);font-size:1.08rem;margin:.35em 0 0}
.card-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
.card-grid.two{grid-template-columns:repeat(2,minmax(0,1fr))}
.card,.callout,.guide-card,.result-card,.form-panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px;min-width:0}
.card h3,.guide-card h3{margin-top:0;font-size:1.28rem;line-height:1.25}
.card p,.guide-card p{color:var(--muted)}
.kicker{font-size:.85rem;font-weight:900;text-transform:uppercase;letter-spacing:.08em;color:var(--teal);margin-bottom:7px}
.callout{border-left:6px solid var(--amber)}
.callout.info{border-left-color:var(--blue)}
.callout.good{border-left-color:var(--green)}
.callout.warn{border-left-color:var(--amber)}
.callout.danger{border-left-color:var(--red)}
.ad-wrap{margin:30px auto;padding:14px;border:1px solid var(--line);background:#fff;border-radius:18px;min-height:90px;display:block;overflow:hidden;max-width:100%}
.ad-wrap:before{content:"Advertisement";display:block;color:var(--muted);font-size:.78rem;text-align:center;margin-bottom:8px}
.article-layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:28px;align-items:start}
.article-main{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:clamp(22px,4vw,42px);box-shadow:var(--shadow);min-width:0}
.article-main h1{font-size:clamp(2rem,4vw,3.25rem);color:var(--ink)}
.article-main h2{font-size:clamp(1.45rem,2.4vw,2rem);line-height:1.2;margin-top:1.6em}
.article-main h3{font-size:1.22rem;margin-top:1.4em}
.article-meta{display:flex;flex-wrap:wrap;gap:10px;color:var(--muted);font-size:.95rem;margin:14px 0 24px}
.sidebar{position:sticky;top:92px;display:grid;gap:18px}
.sidebar .card{box-shadow:none}
.breadcrumbs{font-size:.92rem;margin-bottom:14px;color:var(--muted)}
.breadcrumbs a{color:var(--muted)}
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:16px;background:#fff;margin:20px 0}
table{width:100%;border-collapse:collapse;min-width:680px}
th,td{padding:13px 14px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
th{background:#f1f6fc;color:var(--navy);font-weight:900}
tr:last-child td{border-bottom:0}
.flow{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;margin:22px 0}
.flow-step{padding:18px;border:1px solid var(--line);background:#fff;border-radius:18px;position:relative}
.flow-step strong{display:block;color:var(--navy);font-size:1.06rem}
.flow-step span{display:inline-grid;place-items:center;width:30px;height:30px;border-radius:50%;background:var(--navy);color:#fff;font-weight:900;margin-bottom:8px}
.badge-row{display:flex;flex-wrap:wrap;gap:9px;margin:12px 0}
.badge{display:inline-flex;align-items:center;gap:6px;border:1px solid var(--line);background:#fff;border-radius:999px;padding:6px 10px;font-weight:800;color:var(--navy);font-size:.88rem}
.badge.free{background:#e4f7ef;color:var(--green)}
.badge.safe{background:#eef4fb;color:var(--blue)}
form.checker-form{display:grid;gap:16px}

.checkbox-row{display:flex;align-items:flex-start;gap:10px;font-weight:700;color:var(--ink);background:#f8fbff;border:1px solid var(--line);border-radius:14px;padding:12px 14px}
.checkbox-row input{margin-top:6px;flex:0 0 auto}
small{color:var(--muted)}
.field-row{display:grid;grid-template-columns:minmax(0,1fr) 220px;gap:14px}
label{font-weight:900;color:var(--navy)}
input[type="url"],select,input[type="text"]{width:100%;min-height:50px;padding:12px 14px;border:1px solid #bfcbd9;border-radius:14px;font:inherit;background:#fff;color:var(--ink)}
.help-text{color:var(--muted);font-size:.94rem;margin:.25em 0 0}
.results-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;margin-top:24px}
.result-card{box-shadow:none}
.result-card h2,.result-card h3{margin-top:0}
.status{display:inline-flex;align-items:center;gap:7px;border-radius:999px;padding:5px 10px;font-weight:900;font-size:.86rem;margin-bottom:8px}
.status.pass{background:#e4f7ef;color:var(--green)}
.status.warn{background:#fff5df;color:#915e05}
.status.issue{background:#ffecea;color:var(--red)}
.status.neutral{background:#eef4fb;color:var(--blue)}
.metric-list{display:grid;gap:9px;margin:0;padding:0;list-style:none}
.metric-list li{display:flex;justify-content:space-between;gap:12px;border-bottom:1px dashed var(--line);padding-bottom:8px;align-items:flex-start}
.metric-list li:last-child{border-bottom:0;padding-bottom:0}
.metric-list strong{color:var(--navy)}
pre.code-box{white-space:pre-wrap;word-break:break-word;background:#0e1b2e;color:#eaf2ff;border-radius:16px;padding:16px;overflow:auto;font-size:.92rem}
.error-box{background:#fff0ed;border:1px solid #f2b9ae;color:#7c271e;border-radius:18px;padding:18px}
.notice{background:#fff8e8;border:1px solid #ecd19a;border-radius:18px;padding:18px;color:#4d3813}
.footer-grid{display:grid;grid-template-columns:1.1fr .75fr .75fr;gap:28px;padding:38px 0;border-top:1px solid rgba(255,255,255,.15)}
.site-footer{background:#0e1b2e;color:#dce8f6;margin-top:50px}
.site-footer a{color:#fff}
.site-footer h2{font-size:1rem;margin:0 0 10px;color:#fff}
.site-footer p{color:#bdcbe0}
.footer-links{display:grid;gap:8px}
.footer-bottom{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;border-top:1px solid rgba(255,255,255,.12);padding:18px 0;color:#bdcbe0}
.footer-bottom p{margin:0}
@media (max-width:1080px){
  .hero-grid,.article-layout{grid-template-columns:1fr}
  .sidebar{position:static}
  .card-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .flow{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:720px){
  body{font-size:16px}
  .wrap{width:min(100% - 24px,var(--max))}
  .topbar{align-items:flex-start}
  .brand{width:100%}
  .site-nav{justify-content:flex-start;width:100%;overflow-x:auto;flex-wrap:nowrap;padding-bottom:3px}
  .site-nav a{white-space:nowrap}
  .hero{padding:48px 0 40px}
  .card-grid,.card-grid.two,.results-grid,.field-row,.footer-grid,.flow{grid-template-columns:1fr}
  .article-main{padding:22px}
  .button{width:100%}
}
@media print{
  .site-header,.site-footer,.ad-wrap,.sidebar,.hero-actions{display:none!important}
  body{background:#fff;color:#000}
  .article-main,.card,.callout{box-shadow:none;border:1px solid #999}
}


/* v3 utility additions */
.tool-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
.tool-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px;min-width:0;display:flex;flex-direction:column;gap:10px}
.tool-card h3{margin:0;font-size:1.25rem;line-height:1.25}.tool-card p{margin:.15rem 0;color:var(--muted)}.tool-card .button{margin-top:auto;align-self:flex-start}
.tool-card.featured{border-color:#9cc6e8;background:linear-gradient(180deg,#fff,#f5fbff)}
textarea{width:100%;min-height:130px;padding:12px 14px;border:1px solid #bfcbd9;border-radius:14px;font:inherit;background:#fff;color:var(--ink);resize:vertical}
input[type="number"]{width:100%;min-height:50px;padding:12px 14px;border:1px solid #bfcbd9;border-radius:14px;font:inherit;background:#fff;color:var(--ink)}
.tool-output{margin-top:22px}.summary-row{display:flex;flex-wrap:wrap;gap:10px;margin:14px 0}.summary-pill{display:inline-flex;align-items:center;gap:8px;border:1px solid var(--line);background:#fff;border-radius:999px;padding:8px 12px;font-weight:800;color:var(--navy)}
.result-table{min-width:760px}.mini-table{min-width:520px}.code-actions{display:flex;flex-wrap:wrap;gap:10px;margin:12px 0}.code-box.light{background:#f8fbff;color:var(--ink);border:1px solid var(--line)}
.checklist-section{border:1px solid var(--line);border-radius:18px;background:#fff;padding:18px;margin:16px 0}.checklist-section h3{margin-top:0}.check-item{display:flex;gap:10px;align-items:flex-start;margin:10px 0}.check-item input{margin-top:7px;flex:0 0 auto}.check-item span{display:block}.muted-small{color:var(--muted);font-size:.92rem}.pill-list{display:flex;gap:8px;flex-wrap:wrap}.warn-text{color:#915e05;font-weight:800}.issue-text{color:var(--red);font-weight:800}.pass-text{color:var(--green);font-weight:800}
.preview-card{border:1px solid var(--line);background:#fff;border-radius:16px;padding:16px;max-width:720px}.preview-url{color:#188038;font-size:.92rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.preview-title{color:#1a0dab;font-size:1.18rem;line-height:1.25;margin:4px 0}.preview-desc{color:#4d5156;font-size:.96rem;line-height:1.45}.builder-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.field-stack{display:grid;gap:8px;margin:12px 0}.inline-fields{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.copy-note{font-size:.92rem;color:var(--muted)}
@media (max-width:1080px){.tool-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.builder-grid{grid-template-columns:1fr}}
@media (max-width:720px){.tool-grid,.inline-fields{grid-template-columns:1fr}.tool-card .button{width:100%}}
/* v4 sitemap-quality report helpers */
.filter-bar{display:flex;flex-wrap:wrap;gap:8px;margin:14px 0 16px}
.filter-bar button{border:1px solid var(--line);background:#fff;border-radius:999px;padding:8px 12px;font-weight:800;color:var(--navy);cursor:pointer}
.filter-bar button:hover,.filter-bar button:focus{border-color:var(--blue);box-shadow:0 0 0 3px rgba(37,99,235,.12)}
@media print{.site-header,.site-footer,.checker-form,.code-actions,.filter-bar,.ad-wrap{display:none!important}.article-layout{display:block}.article-main{max-width:none}.result-table{font-size:11px}.table-wrap{overflow:visible}}