/* =========================================================
   SEOWebChecker — Whiteboard Online Editor
   Design tokens: Ink & Paper
   ========================================================= */
:root{
  --paper:#F9F8F4;
  --paper-2:#F0EEE6;
  --ink:#1C2333;
  --ink-soft:#4A5169;
  --line:#DAD6C8;
  --brand:#2451B8;
  --brand-2:#173B8C;
  --marker:#FFC93C;
  --marker-ink:#7A5300;
  --danger:#C1432B;
  --success:#1F7A4D;
  --surface:#FFFFFF;
  --shadow: 0 1px 2px rgba(28,35,51,.06), 0 8px 24px rgba(28,35,51,.06);
  --radius: 10px;
  --font-display:'Outfit', system-ui, sans-serif;
  --font-body:'Inter', system-ui, sans-serif;
  --header-h: 68px;
}
[data-theme="dark"]{
  --paper:#14161F;
  --paper-2:#1B1E2A;
  --ink:#EDEEF3;
  --ink-soft:#A6ACC2;
  --line:#2B2F41;
  --brand:#6C93E8;
  --brand-2:#8FB0F5;
  --surface:#1B1E2A;
  --shadow: 0 1px 2px rgba(0,0,0,.3), 0 12px 28px rgba(0,0,0,.35);
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-body);
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
  transition:background .25s ease,color .25s ease;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
h1,h2,h3,h4{font-family:var(--font-display);margin:0 0 .5em;line-height:1.15;letter-spacing:-.01em;}
p{margin:0 0 1em;}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px;}
:focus-visible{outline:3px solid var(--brand);outline-offset:2px;}
.skip-link{position:absolute;left:-9999px;top:0;background:var(--brand);color:#fff;padding:10px 16px;z-index:2000;border-radius:0 0 8px 0;}
.skip-link:focus{left:0;}
button{font-family:inherit;cursor:pointer;}

/* ---------- Top utility strip ---------- */
.top-strip{
  background:var(--brand-2);
  color:#fff;
  font-size:12.5px;
  text-align:center;
  padding:6px 12px;
}
.top-strip a{text-decoration:underline;text-underline-offset:2px;}

/* ---------- Header ---------- */
.site-header{
  position:sticky;top:0;z-index:900;
  background:var(--surface);
  border-bottom:1px solid var(--line);
  height:var(--header-h);
}
.header-inner{
  height:var(--header-h);
  display:flex;align-items:center;justify-content:space-between;gap:16px;
}
.brand{display:flex;align-items:center;gap:9px;font-family:var(--font-display);font-weight:700;font-size:19px;white-space:nowrap;}
.brand-mark{
  width:34px;height:34px;border-radius:8px;
  background:linear-gradient(135deg,var(--brand),var(--marker));
  display:flex;align-items:center;justify-content:center;color:#fff;font-size:17px;flex:none;
}
nav.primary-nav{display:none;}
.nav-list{list-style:none;display:flex;gap:4px;margin:0;padding:0;align-items:center;}
.nav-list>li{position:relative;}
.nav-link{display:flex;align-items:center;gap:5px;padding:10px 12px;border-radius:8px;font-size:14.5px;font-weight:500;color:var(--ink-soft);}
.nav-link:hover,.nav-link:focus-visible{color:var(--brand);background:var(--paper-2);}
.caret{width:9px;height:9px;border-right:2px solid currentColor;border-bottom:2px solid currentColor;transform:rotate(45deg);transition:transform .18s ease;margin-top:-3px;}
.has-dropdown:hover .caret,.has-dropdown:focus-within .caret{transform:rotate(225deg);margin-top:3px;}

.dropdown{
  position:absolute;
  top:100%;
  left:0;
  min-width:560px;
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:12px;
  box-shadow:var(--shadow);
  padding:14px;
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:2px;
  opacity:0;
  visibility:hidden;
  transform:translateY(4px);
  transition:opacity .16s ease,transform .16s ease,visibility .16s;
  z-index:950;
}
.has-dropdown:hover .dropdown,.has-dropdown:focus-within .dropdown{
  opacity:1;visibility:visible;transform:translateY(0);
}
.dropdown a{
  padding:9px 10px;border-radius:7px;font-size:13.5px;color:var(--ink-soft);display:block;
}
.dropdown a:hover,.dropdown a:focus-visible{background:var(--paper-2);color:var(--brand);}

.header-actions{display:flex;align-items:center;gap:10px;}
.theme-toggle{
  width:40px;height:40px;border-radius:10px;border:1px solid var(--line);background:var(--paper-2);
  display:flex;align-items:center;justify-content:center;color:var(--ink);flex:none;
}
.theme-toggle svg{width:18px;height:18px;}
.cta-btn{
  background:var(--brand);color:#fff;padding:10px 18px;border-radius:9px;font-weight:600;font-size:14px;border:none;white-space:nowrap;
}
.cta-btn:hover{background:var(--brand-2);}
.menu-toggle{
  display:flex;width:40px;height:40px;border-radius:10px;border:1px solid var(--line);background:var(--paper-2);
  align-items:center;justify-content:center;
}
.menu-toggle span,.menu-toggle::before,.menu-toggle::after{content:"";display:block;width:18px;height:2px;background:var(--ink);position:relative;}
.menu-toggle{flex-direction:column;gap:4px;}

/* mobile nav */
.mobile-nav{
  position:fixed;inset:0 0 0 auto;width:min(340px,86vw);height:100vh;
  background:var(--surface);border-left:1px solid var(--line);
  transform:translateX(100%);transition:transform .28s ease;
  z-index:1100;overflow-y:auto;padding:18px;
}
.mobile-nav.open{transform:translateX(0);}
.mobile-nav-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px;}
.mobile-nav-close{width:36px;height:36px;border-radius:8px;border:1px solid var(--line);background:var(--paper-2);}
.mobile-nav details{border-bottom:1px solid var(--line);padding:8px 0;}
.mobile-nav summary{font-weight:600;padding:8px 4px;list-style:none;display:flex;justify-content:space-between;cursor:pointer;}
.mobile-nav summary::-webkit-details-marker{display:none;}
.mobile-nav .sub-links{display:flex;flex-direction:column;gap:2px;padding:4px 4px 10px;}
.mobile-nav .sub-links a{padding:8px;border-radius:7px;font-size:14px;color:var(--ink-soft);}
.mobile-nav .sub-links a:hover{background:var(--paper-2);}
.scrim{position:fixed;inset:0;background:rgba(0,0,0,.4);opacity:0;visibility:hidden;transition:opacity .25s ease;z-index:1050;}
.scrim.open{opacity:1;visibility:visible;}

/* ---------- Breadcrumb ---------- */
.breadcrumb{padding:14px 0;border-bottom:1px solid var(--line);background:var(--paper-2);}
.breadcrumb ol{list-style:none;display:flex;flex-wrap:wrap;gap:6px;margin:0;padding:0;font-size:13px;color:var(--ink-soft);}
.breadcrumb a{color:var(--brand);}
.breadcrumb li:not(:last-child)::after{content:"›";margin-left:6px;color:var(--ink-soft);}

/* ---------- Hero ---------- */
.hero{padding:44px 0 30px;position:relative;}
.hero-grid{display:grid;gap:34px;}
.eyebrow{
  display:inline-flex;align-items:center;gap:6px;font-size:12.5px;font-weight:700;color:var(--brand);
  background:var(--paper-2);border:1px solid var(--line);padding:6px 12px;border-radius:999px;margin-bottom:14px;
  text-transform:uppercase;letter-spacing:.06em;
}
.hero h1{font-size:clamp(28px,5.4vw,44px);}
.hero h1 .accent{color:var(--brand);}
.hero p.lead{font-size:16.5px;color:var(--ink-soft);max-width:60ch;}
.hero-cta-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:18px;}
.btn{
  display:inline-flex;align-items:center;gap:8px;padding:12px 20px;border-radius:10px;font-weight:600;font-size:14.5px;border:1px solid transparent;
}
.btn-primary{background:var(--brand);color:#fff;}
.btn-primary:hover{background:var(--brand-2);}
.btn-outline{background:transparent;border-color:var(--line);color:var(--ink);}
.btn-outline:hover{border-color:var(--brand);color:var(--brand);}
.trust-row{display:flex;flex-wrap:wrap;gap:18px;margin-top:22px;font-size:12.5px;color:var(--ink-soft);}
.trust-row span{display:flex;align-items:center;gap:6px;}
.dot{width:6px;height:6px;border-radius:50%;background:var(--success);}

/* ---------- Whiteboard workspace (signature element) ---------- */
.workspace{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:16px;
  box-shadow:var(--shadow);
  overflow:hidden;
}
.toolbar{
  display:flex;flex-wrap:wrap;gap:6px;align-items:center;
  padding:10px 12px;border-bottom:1px solid var(--line);background:var(--paper-2);
}
.tool-group{display:flex;gap:4px;align-items:center;padding:2px 8px;border-right:1px solid var(--line);}
.tool-group:last-child{border-right:none;}
.tool-btn{
  width:36px;height:36px;border-radius:8px;border:1px solid transparent;background:transparent;
  display:flex;align-items:center;justify-content:center;color:var(--ink-soft);
}
.tool-btn svg{width:17px;height:17px;}
.tool-btn:hover{background:var(--surface);color:var(--brand);}
.tool-btn.active{background:var(--brand);color:#fff;}
.tool-btn:disabled{opacity:.35;cursor:not-allowed;}
input[type="color"].color-swatch{
  width:34px;height:34px;border-radius:8px;border:1px solid var(--line);padding:2px;background:var(--surface);
}
input[type="range"].size-range{width:88px;accent-color:var(--brand);}
select.bg-select{
  border:1px solid var(--line);border-radius:8px;padding:8px 10px;background:var(--surface);color:var(--ink);font-size:13px;
}
.canvas-wrap{position:relative;background:repeating-linear-gradient(0deg,transparent,transparent 27px,var(--line) 28px);}
[data-theme="dark"] .canvas-wrap{background:repeating-linear-gradient(0deg,transparent,transparent 27px, #262a3a 28px);}
#board{width:100%;height:520px;display:block;touch-action:none;background:#fff;cursor:crosshair;}
.canvas-hint{position:absolute;bottom:10px;left:12px;font-size:11.5px;color:var(--ink-soft);background:var(--surface);padding:4px 9px;border-radius:999px;border:1px solid var(--line);opacity:.85;}

.workspace-footer{display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between;align-items:center;padding:12px;border-top:1px solid var(--line);background:var(--paper-2);}
.status-msg{font-size:13px;color:var(--ink-soft);min-height:18px;}
.status-msg.error{color:var(--danger);}
.status-msg.success{color:var(--success);}
.export-row{display:flex;flex-wrap:wrap;gap:8px;}

/* ---------- Result / share / feedback ---------- */
.result-section{padding:40px 0;scroll-margin-top:90px;}
.result-card{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:20px;box-shadow:var(--shadow);}
.result-preview{border:1px dashed var(--line);border-radius:10px;padding:12px;text-align:center;background:var(--paper-2);}
.result-preview img{margin:0 auto;border-radius:8px;max-height:420px;}
.action-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px;}
.action-row .btn svg{width:16px;height:16px;}

.post-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:20px;}
.share-panel,.feedback-panel{flex:1 1 260px;background:var(--paper-2);border:1px solid var(--line);border-radius:12px;padding:16px;}
.share-icons{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px;}
.share-icons button{width:38px;height:38px;border-radius:9px;border:1px solid var(--line);background:var(--surface);display:flex;align-items:center;justify-content:center;}
.feedback-panel textarea{width:100%;border:1px solid var(--line);border-radius:8px;padding:10px;font-family:inherit;resize:vertical;min-height:64px;background:var(--surface);color:var(--ink);}
.feedback-stars{display:flex;gap:4px;margin:8px 0;}
.feedback-stars button{background:none;border:none;font-size:20px;color:var(--line);}
.feedback-stars button.active,.feedback-stars button:hover{color:var(--marker);}

/* ---------- Sections generic ---------- */
section{padding:56px 0;}
.section-head{max-width:680px;margin:0 auto 34px;text-align:center;}
.section-head h2{font-size:clamp(24px,3.6vw,32px);}
.section-head p{color:var(--ink-soft);font-size:15.5px;}

/* Features */
.features-grid{display:grid;gap:16px;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));}
.feature-card{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:20px;transition:transform .18s ease,box-shadow .18s ease;}
.feature-card:hover{transform:translateY(-3px);box-shadow:var(--shadow);}
.feature-icon{width:42px;height:42px;border-radius:10px;background:var(--paper-2);display:flex;align-items:center;justify-content:center;margin-bottom:12px;color:var(--brand);}
.feature-card h3{font-size:16.5px;}
.feature-card p{font-size:14px;color:var(--ink-soft);margin-bottom:0;}

/* How it works */
.steps{display:grid;gap:16px;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));counter-reset:step;}
.step{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:20px;position:relative;}
.step-num{font-family:var(--font-display);font-weight:800;font-size:26px;color:var(--brand);margin-bottom:8px;}
.step h3{font-size:15.5px;}
.step p{font-size:13.5px;color:var(--ink-soft);margin-bottom:0;}

/* Reference tools list before FAQ */
.ref-tools{background:var(--paper-2);border-radius:16px;padding:28px;}
.ref-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:6px;list-style:none;margin:0;padding:0;}
.ref-list a{font-size:13.5px;color:var(--brand);padding:7px 8px;border-radius:7px;display:block;}
.ref-list a:hover{background:var(--surface);}

/* Article */
.article-block{max-width:820px;margin:0 auto;}
.article-block h2{font-size:24px;}
.article-block p{color:var(--ink-soft);font-size:15px;}

/* FAQ */
.faq-list{max-width:820px;margin:0 auto;}
.faq-item{border-bottom:1px solid var(--line);}
.faq-q{width:100%;text-align:left;background:none;border:none;padding:16px 4px;display:flex;justify-content:space-between;align-items:center;font-weight:600;font-size:15px;color:var(--ink);}
.faq-q .plus{width:20px;height:20px;position:relative;flex:none;}
.faq-q .plus::before,.faq-q .plus::after{content:"";position:absolute;background:var(--brand);top:50%;left:50%;transform:translate(-50%,-50%);}
.faq-q .plus::before{width:14px;height:2px;}
.faq-q .plus::after{width:2px;height:14px;transition:transform .2s ease;}
.faq-item[open] .plus::after{transform:translate(-50%,-50%) rotate(90deg);opacity:0;}
.faq-a{padding:0 4px 16px;color:var(--ink-soft);font-size:14.5px;}

/* CTA */
.cta-section{background:linear-gradient(135deg,var(--brand),var(--brand-2));border-radius:20px;margin:0 auto;max-width:1200px;padding:44px 30px;text-align:center;color:#fff;}
.cta-section h2{color:#fff;}
.cta-section p{color:rgba(255,255,255,.85);max-width:560px;margin:0 auto 20px;}
.cta-row{display:flex;flex-wrap:wrap;gap:12px;justify-content:center;}
.cta-row .btn-outline{border-color:rgba(255,255,255,.5);color:#fff;}
.cta-row .btn-outline:hover{background:rgba(255,255,255,.12);}
.cta-row .btn-white{background:#fff;color:var(--brand-2);}
.cta-row .btn-white:hover{background:var(--marker);color:var(--marker-ink);}

/* Footer */
.site-footer{background:var(--paper-2);border-top:1px solid var(--line);padding:44px 0 0;margin-top:60px;font-size:13.5px;}
.footer-grid{display:grid;gap:24px;grid-template-columns:1.4fr repeat(4,1fr);}
.footer-col h4{font-size:13px;text-transform:uppercase;letter-spacing:.05em;color:var(--ink-soft);margin-bottom:12px;}
.footer-col a{display:block;color:var(--ink-soft);padding:5px 0;}
.footer-col a:hover{color:var(--brand);}
.footer-bottom{border-top:1px solid var(--line);margin-top:30px;padding:18px 0;display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;color:var(--ink-soft);}
.disclaimer{font-size:12px;color:var(--ink-soft);max-width:1200px;margin:0 auto;padding:0 20px 24px;}

/* Cookie banner */
.cookie-banner{
  position:fixed;left:16px;right:16px;bottom:16px;max-width:640px;margin:0 auto;
  background:var(--surface);border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow);
  padding:16px 18px;display:flex;flex-wrap:wrap;gap:12px;align-items:center;justify-content:space-between;
  z-index:1200;transform:translateY(140%);transition:transform .35s ease;
}
.cookie-banner.show{transform:translateY(0);}
.cookie-banner p{margin:0;font-size:13px;color:var(--ink-soft);flex:1 1 260px;}
.cookie-actions{display:flex;gap:8px;}
.cookie-actions button{padding:9px 16px;border-radius:8px;font-size:13px;font-weight:600;border:1px solid var(--line);background:var(--paper-2);}
.cookie-actions .accept{background:var(--brand);color:#fff;border-color:var(--brand);}

.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;}

@media (min-width:900px){
  nav.primary-nav{display:block;}
  .menu-toggle,.mobile-nav,.scrim{display:none;}
  .hero-grid{grid-template-columns:1fr;}
}
@media (max-width:899px){
  .footer-grid{grid-template-columns:1fr 1fr;}
}
@media (max-width:520px){
  .footer-grid{grid-template-columns:1fr;}
  #board{height:380px;}
  .dropdown{min-width:0;left:0;right:0;grid-template-columns:1fr;}
}
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.001ms !important;transition-duration:.001ms !important;}
}