:root{
  /* ===== Design system — premium light, accent HUE 155 (Excel green) ===== */
  --ink:oklch(24% .02 160);
  --muted:oklch(52% .03 160);
  --paper:oklch(97% .01 160);
  --surface:oklch(100% .002 160);
  --line:oklch(90% .02 160);
  --accent:oklch(54% .14 155);
  --accent-dark:oklch(43% .11 155);
  --accent-soft:oklch(94% .05 155);
  /* Aliases consumed by shared pSEO subpage inline styles / markup */
  --heading:var(--ink);
  --primary:var(--accent-dark);
  --border:var(--line);
  --radius:16px;
  --shadow:0 1px 2px oklch(24% .04 160 / .04),0 12px 30px oklch(24% .04 160 / .06);
  font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  color:var(--ink);
  font-synthesis:none;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{background:var(--paper);font-size:16px;line-height:1.55;color:var(--ink);overflow-x:hidden;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
button,input,select,textarea{font:inherit}
button{cursor:pointer}
a{color:inherit}
code{font-family:"Fira Code",ui-monospace,"SF Mono",Menlo,Consolas,monospace}
h1,h2,h3{text-wrap:balance}
img{max-width:100%;display:block}

/* ---------- Header ---------- */
.site-header{min-height:74px;display:flex;align-items:center;gap:32px;padding:0 clamp(16px,5vw,72px);border-bottom:1px solid var(--line);background:oklch(100% .002 160 / .82);backdrop-filter:saturate(1.4) blur(10px);position:sticky;top:0;z-index:20}
.logo,.brand{font-size:18px;font-weight:850;letter-spacing:-.04em;text-decoration:none;color:var(--ink)}
.logo span,.brand span{color:var(--accent)}
.site-header nav{display:flex;gap:24px;margin-left:auto;font-size:14px;color:var(--muted)}
.site-header nav a{text-decoration:none;transition:color .18s}
.site-header nav a:hover{color:var(--accent-dark)}

/* ---------- Layout / hero ---------- */
.page-wrapper{max-width:1200px;margin:auto;padding:0 clamp(16px,5vw,72px) 80px}
.hero{padding:64px 0 40px;max-width:880px}
.hero-badge{display:inline-flex;align-items:center;gap:8px;text-transform:uppercase;letter-spacing:.1em;font-size:11px;font-weight:850;color:var(--accent-dark);background:var(--accent-soft);padding:7px 14px;border-radius:999px}
.page-title{font-size:clamp(40px,6.5vw,76px);line-height:1;letter-spacing:-.055em;margin:18px 0 18px}
.page-sub{max-width:680px;color:var(--muted);font-size:18px;line-height:1.6}

/* ---------- Tool layout ---------- */
.tool-layout{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.1fr);gap:24px;align-items:start}
.input-panel,.output-panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:clamp(18px,2.4vw,26px);box-shadow:var(--shadow)}
.panel-header{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-bottom:14px}
.panel-header h3{font-size:15px;font-weight:750;letter-spacing:-.01em}
.panel-header.mt-4{margin-top:26px}
.header-actions{display:flex;align-items:center;gap:10px;flex-wrap:wrap}

/* ---------- Controls ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;font-weight:650;border-radius:11px;border:1px solid var(--line);background:var(--surface);color:var(--ink);padding:11px 16px;min-height:44px;transition:transform .18s cubic-bezier(.16,1,.3,1),background .18s,border-color .18s,box-shadow .18s}
.btn:hover{transform:translateY(-2px)}
.btn.btn-sm{padding:8px 13px;min-height:38px;font-size:13.5px}
.btn.primary-btn{background:var(--accent);border-color:transparent;color:oklch(99% 0 0)}
.btn.primary-btn:hover{background:var(--accent-dark);box-shadow:0 8px 20px oklch(54% .14 155 / .28)}
.btn.ghost-btn{background:var(--accent-soft);border-color:transparent;color:var(--accent-dark)}
.btn.ghost-btn:hover{background:oklch(90% .06 155)}
.copy-btn.is-copied{background:var(--accent-dark)!important;border-color:transparent;color:oklch(99% 0 0)}
.styled-input,.styled-select-small,.data-editor,.code-editor{width:100%;font-size:16px;color:var(--ink);background:var(--paper);border:1px solid var(--line);border-radius:11px;padding:11px 13px;transition:border-color .18s,box-shadow .18s}
.styled-select-small{width:auto;min-height:38px;padding:8px 12px;font-size:13.5px}
.styled-input:focus,.styled-select-small:focus,.data-editor:focus,.code-editor:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
.data-editor{min-height:190px;resize:vertical;font-family:"Fira Code",ui-monospace,Menlo,Consolas,monospace;font-size:14px;line-height:1.6}
.settings-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.setting-item{display:flex;flex-direction:column;gap:6px}
.setting-item.full-width{grid-column:1/-1}
.setting-item label{font-size:13px;font-weight:600;color:var(--muted)}
.checkbox-item{flex-direction:row;align-items:center;gap:10px}
.checkbox-item input[type=checkbox]{width:18px;height:18px;accent-color:var(--accent);flex:none}
.checkbox-item label{color:var(--ink);font-weight:550}
/* ---------- Tabs ---------- */
.tabs{display:flex;gap:4px;flex-wrap:wrap;padding:4px;background:var(--paper);border:1px solid var(--line);border-radius:13px;margin-bottom:16px}
.tab-btn{flex:1 1 auto;min-height:40px;padding:9px 12px;font-size:13.5px;font-weight:650;color:var(--muted);background:transparent;border:none;border-radius:9px;display:inline-flex;align-items:center;justify-content:center;gap:6px;transition:background .18s,color .18s}
.tab-btn:hover{color:var(--ink)}
.tab-btn.active{background:var(--surface);color:var(--accent-dark);box-shadow:0 1px 3px oklch(24% .04 160 / .1)}
.badge-pro{font-size:9.5px;font-weight:800;letter-spacing:.05em;color:var(--accent-dark);background:var(--accent-soft);padding:2px 6px;border-radius:6px}
.tab-content{display:none;animation:fade .25s cubic-bezier(.16,1,.3,1)}
.tab-content.active{display:block}
@keyframes fade{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}

/* ---------- Preview + code ---------- */
.table-preview-wrapper{min-height:220px;max-height:440px;overflow:auto;border:1px solid var(--line);border-radius:12px;padding:16px;background:var(--paper)}
.preview-container-inner{width:100%;overflow-x:auto;-webkit-overflow-scrolling:touch}
.seo-table-preview{width:100%;border-collapse:collapse;font-size:14px}
.seo-table-preview caption{caption-side:top;text-align:left;font-weight:700;margin-bottom:.6em;color:var(--ink)}
.seo-table-preview th,.seo-table-preview td{padding:10px 14px;text-align:left;border-bottom:1px solid var(--line)}
.seo-table-preview thead th{background:var(--accent-soft);font-weight:700;color:var(--accent-dark);border-bottom:2px solid oklch(85% .06 155)}
.seo-table-preview tbody tr:hover{background:var(--accent-soft)}
.code-action-bar{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-bottom:12px}
.code-editor{min-height:300px;resize:vertical;font-family:"Fira Code",ui-monospace,Menlo,Consolas,monospace;font-size:13px;line-height:1.6;white-space:pre;color:oklch(30% .02 160)}
.schema-editor{color:var(--accent-dark)}
.schema-highlight{font-size:13px;font-weight:600;color:var(--accent-dark);background:var(--accent-soft);padding:5px 10px;border-radius:8px}
.muted{color:var(--muted)}
.text-center{text-align:center}
.text-sm{font-size:13px}
code{background:var(--accent-soft);color:var(--accent-dark);padding:2px 6px;border-radius:6px;font-size:.9em}
/* ---------- SEO content ---------- */
.dt-container{max-width:900px;margin-inline:auto}
.dt-mb-16{margin-bottom:16px}
.seo-section{max-width:820px;margin:72px auto 0;display:flex;flex-direction:column;gap:14px}
.seo-section h2{font-size:clamp(24px,3.2vw,32px);letter-spacing:-.03em;margin-top:26px}
.seo-section h2:first-child{margin-top:0}
.seo-section p{color:var(--muted);font-size:16.5px;line-height:1.7}
.seo-section strong{color:var(--ink)}
.step-list{display:flex;flex-direction:column;gap:10px;padding-left:22px;color:var(--muted);font-size:16px;line-height:1.6}
.step-list li{padding-left:4px}

/* ---------- FAQ ---------- */
.faq-section{margin-top:64px}
.faq-heading,.related-heading{font-size:clamp(24px,3.2vw,32px);letter-spacing:-.03em;margin-bottom:20px}
.faq-list{display:flex;flex-direction:column;gap:12px}
.faq-item{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:4px 18px;transition:border-color .18s,box-shadow .18s}
.faq-item:hover{border-color:oklch(84% .04 155)}
.faq-item summary{cursor:pointer;font-weight:650;padding:14px 0;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:12px}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";font-size:22px;font-weight:400;color:var(--accent);transition:transform .2s}
.faq-item[open] summary::after{transform:rotate(45deg)}
.faq-item p{color:var(--muted);line-height:1.7;padding:0 0 16px}

/* ---------- Related + footer ---------- */
.related-section{margin-top:60px}
.related-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:14px}
.related-card{display:block;background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:18px 20px;font-weight:650;text-decoration:none;color:var(--ink);transition:transform .18s cubic-bezier(.16,1,.3,1),border-color .18s,box-shadow .18s}
.related-card:hover{transform:translateY(-3px);border-color:var(--accent);box-shadow:var(--shadow)}
.site-footer{margin-top:72px;padding-top:28px;border-top:1px solid var(--line);color:var(--muted);font-size:14px;display:flex;flex-direction:column;gap:6px}
.site-footer a{color:var(--accent-dark);text-decoration:none}
.site-footer a:hover{text-decoration:underline}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px}
/* ---------- Responsive ---------- */
@media(max-width:900px){
  .tool-layout{grid-template-columns:1fr}
  .hero{padding:44px 0 30px}
  .site-header nav{display:none}
}
@media(max-width:560px){
  .settings-grid{grid-template-columns:1fr}
  .page-wrapper{padding-bottom:56px}
  .tab-btn{flex:1 1 40%}
  .code-editor{min-height:240px}
  .styled-input,.data-editor,.code-editor{font-size:16px}
}

/* ---------- Motion preference ---------- */
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important;scroll-behavior:auto!important}
}