:root{
  --ink:#0d1722;
  --muted:#667483;
  --line:#dce3e9;
  --paper:#f6f8fa;
  --card:#ffffff;
  --accent:#2f5bea;
  --accent-dark:#2148c7;
  --success:#1f7a52;
  --max:1180px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  color:var(--ink);
  background:var(--paper);
  line-height:1.5
}
a{color:inherit;text-decoration:none}
.shell{max-width:var(--max);margin:0 auto;padding:0 28px}
.topbar{
  background:rgba(246,248,250,.96);
  border-bottom:1px solid var(--line);
  position:sticky;top:0;z-index:20
}
.nav{height:74px;display:flex;align-items:center;justify-content:space-between}
.brand{display:flex;align-items:center;gap:12px;font-weight:760;font-size:22px;letter-spacing:-.03em}
.mark{width:28px;height:28px;border:2px solid var(--ink);border-radius:7px;position:relative;background:white}
.mark:before,.mark:after{content:"";position:absolute;top:5px;bottom:5px;width:3px;border-radius:3px;background:var(--ink)}
.mark:before{left:7px}.mark:after{right:7px}
.navlinks{display:flex;align-items:center;gap:26px;color:#526171;font-size:14px}
.navcta{padding:11px 16px;border-radius:9px;background:var(--ink);color:#fff;font-weight:650}
.hero{padding:86px 0 72px}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:64px;align-items:center}
.eyebrow{font-size:12px;font-weight:760;letter-spacing:.1em;text-transform:uppercase;color:#4a5b6b}
h1{font-size:64px;line-height:1.02;letter-spacing:-.055em;margin:14px 0 24px}
.lead{font-size:20px;color:#526171;max-width:670px;margin:0 0 30px}
.primary{
  display:inline-block;border:0;border-radius:10px;background:var(--accent);color:#fff;
  padding:15px 22px;font-weight:700
}
.primary:hover{background:var(--accent-dark)}
.micro{font-size:13px;color:#768391;margin-top:13px}
.summary-card{background:#fff;border:1px solid var(--line);border-radius:22px;padding:26px;box-shadow:0 20px 60px rgba(13,23,34,.08)}
.summary-top{display:flex;align-items:start;justify-content:space-between;gap:20px}
.score{font-size:48px;letter-spacing:-.05em;font-weight:820}
.score small{font-size:16px;color:#74818d}
.rows{margin-top:20px}
.row{display:grid;grid-template-columns:18px 1fr auto;gap:12px;padding:15px 0;border-top:1px solid #edf1f4}
.dot{width:10px;height:10px;border-radius:50%;background:#9aa6b1;margin-top:6px}
.dot.on{background:var(--success)}
.row strong{font-size:14px}
.row span{font-size:12px;color:#75828d}
.section{padding:72px 0;background:#fff;border-top:1px solid var(--line)}
.section h2{font-size:42px;line-height:1.08;letter-spacing:-.045em;margin:0 0 14px}
.section p{color:#5e6e7d;font-size:18px;max-width:720px}
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:34px}
.step{border:1px solid var(--line);border-radius:14px;padding:24px}
.step b{font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:#6b7986}
.step h3{font-size:19px;margin:12px 0 8px}
.step p{font-size:14px;margin:0}
.footer{padding:38px 0 54px;color:#788591;font-size:13px}
.footer-inner{border-top:1px solid var(--line);padding-top:22px;display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}
@media(max-width:900px){
  .hero-grid{grid-template-columns:1fr;gap:38px}
  h1{font-size:48px}
  .steps{grid-template-columns:1fr}
  .navlinks a:not(.navcta){display:none}
}
@media(max-width:600px){
  .shell{padding:0 18px}
  .hero{padding:54px 0 56px}
  h1{font-size:40px}
  .lead{font-size:18px}
  .section h2{font-size:34px}
}


/* Task 5: interactive checkup */
.app-shell{max-width:860px;margin:0 auto;padding:48px 28px 72px}
.app-top{display:flex;justify-content:space-between;align-items:center;gap:16px;margin-bottom:22px}
.progress-track{height:6px;background:#e7ecf0;border-radius:999px;overflow:hidden}
.progress-bar{height:100%;width:0;background:var(--accent);transition:width .25s ease}
.panel{margin-top:26px;background:#fff;border:1px solid var(--line);border-radius:20px;padding:32px;box-shadow:0 16px 40px rgba(13,23,34,.06)}
.panel h1,.panel h2{font-size:38px;line-height:1.08;letter-spacing:-.045em;margin:0 0 12px}
.panel-copy{font-size:17px;color:#61707e;margin:0 0 28px}
.choice-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.choice{
  border:1px solid #d7e0e7;background:#fff;border-radius:14px;padding:20px;text-align:left;cursor:pointer;
  transition:border-color .15s ease,box-shadow .15s ease,transform .15s ease
}
.choice:hover{border-color:#9fb1c0;box-shadow:0 8px 20px rgba(13,23,34,.06);transform:translateY(-1px)}
.choice.selected{border-color:var(--accent);box-shadow:0 0 0 3px rgba(47,91,234,.10)}
.choice-title{display:block;font-size:17px;font-weight:760;margin-bottom:4px}
.choice-sub{display:block;font-size:13px;color:#74818d}
.action-row{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-top:28px}
.text-button{background:none;border:0;padding:10px 0;color:#5d6b78;font-weight:650;cursor:pointer}
button.primary{cursor:pointer}
button.primary:disabled{opacity:.45;cursor:not-allowed}
.demo-note{
  margin:18px 0 0;padding:12px 14px;border:1px solid #e0d7b8;background:#fffaf0;border-radius:10px;
  color:#6f5b24;font-size:13px
}
.question-meta{font-size:12px;font-weight:760;text-transform:uppercase;letter-spacing:.08em;color:#6b7986;margin-bottom:10px}
.answer-stack{display:grid;gap:10px;margin-top:24px}
.answer{
  width:100%;border:1px solid #d8e0e6;background:white;border-radius:12px;padding:16px 18px;
  text-align:left;display:flex;align-items:center;justify-content:space-between;cursor:pointer;font-weight:690
}
.answer:hover{border-color:#9fb1c0}
.answer.selected{border-color:var(--accent);background:#f7f9ff}
.summary-list{display:grid;gap:12px;margin-top:22px}
.summary-item{
  border:1px solid var(--line);border-radius:14px;padding:18px;display:grid;
  grid-template-columns:1fr auto;gap:14px;align-items:start
}
.summary-item h3{font-size:16px;margin:0 0 5px}
.summary-item p{margin:0;color:#6a7783;font-size:14px}
.pill{font-size:11px;font-weight:800;border-radius:999px;padding:6px 9px;white-space:nowrap}
.pill.active{background:#eef8f3;color:#1c6b49}
.pill.review{background:#fff4e9;color:#9a5915}
.pill.missing{background:#fbeeee;color:#9b3f3f}
.results-hero{display:grid;grid-template-columns:180px 1fr;gap:24px;align-items:center}
.score-box{background:#f7f9fb;border:1px solid var(--line);border-radius:16px;padding:22px;text-align:center}
.score-box strong{font-size:54px;letter-spacing:-.06em;display:block}
.score-box span{font-size:13px;color:#74818d}
.results-copy h1{font-size:36px;line-height:1.05;letter-spacing:-.045em;margin:0 0 10px}
.results-copy p{margin:0;color:#657482}
.setup-card{border:1px solid var(--line);border-radius:16px;padding:22px;margin-top:18px}
.setup-card h2{font-size:21px;margin:0 0 6px}
.setup-card .meta{font-size:13px;color:#74818d;margin-bottom:16px}
.setup-steps{margin:0;padding-left:20px;color:#526171}
.setup-steps li{margin:9px 0}
.source-line{margin-top:16px;padding-top:14px;border-top:1px solid #edf1f4;font-size:12px;color:#7a8792}
.hidden{display:none!important}
@media(max-width:700px){
  .app-shell{padding:30px 18px 56px}
  .panel{padding:24px 18px}
  .panel h1,.panel h2{font-size:31px}
  .choice-grid{grid-template-columns:1fr}
  .results-hero{grid-template-columns:1fr}
  .score-box{text-align:left}
}

.source-line a{color:var(--accent);text-decoration:underline;text-underline-offset:2px}


/* Task 8 polish: result actions and sharing */
.results-actions{margin-top:36px}
.results-action-row{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  flex-wrap:wrap;
}
.button-orange,
.secondary-button,
.text-link-button{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:46px;
  border-radius:10px;
  padding:12px 18px;
  font:inherit;
  font-weight:720;
  cursor:pointer;
  text-decoration:none;
}
.button-orange{
  background:#e87521;
  color:#fff;
  border:1px solid #e87521;
  box-shadow:0 7px 18px rgba(232,117,33,.18);
}
.button-orange:hover{background:#cf651a;border-color:#cf651a}
.secondary-button{
  background:#fff;
  color:var(--ink);
  border:1px solid #cfd8df;
}
.secondary-button:hover{border-color:#9eacb8;background:#fbfcfd}
.text-link-button{
  background:transparent;
  color:#586876;
  border:0;
  padding-left:8px;
  padding-right:8px;
}
.text-link-button:hover{color:var(--ink)}
.share-panel{
  margin-top:28px;
  padding:24px;
  border:1px solid var(--line);
  border-radius:16px;
  background:#fff;
}
.share-panel-subtle{background:#f8fafb}
.share-panel h2{
  font-size:23px;
  line-height:1.15;
  letter-spacing:-.025em;
  margin:7px 0 8px;
}
.share-panel p{
  margin:0;
  max-width:720px;
  color:#697783;
  font-size:15px;
}
.share-actions{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin-top:18px;
}
.share-note{
  min-height:20px;
  margin-top:10px;
  color:#61707e;
  font-size:12px;
}
@media(max-width:600px){
  .results-action-row,
  .share-actions{
    align-items:stretch;
    flex-direction:column;
  }
  .button-orange,
  .secondary-button,
  .text-link-button{
    width:100%;
  }
}


/* About section */
.about-section{background:#fff}
.about-intro{
  display:grid;
  grid-template-columns:1.05fr .95fr;
  gap:56px;
  align-items:end;
}
.about-intro h2{margin-top:12px}
.about-intro > p{margin:0 0 5px}
.stat-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:16px;
  margin-top:38px;
}
.stat-card{
  border:1px solid var(--line);
  border-radius:16px;
  padding:24px;
  background:#f8fafb;
}
.stat-card strong{
  display:block;
  font-size:38px;
  line-height:1;
  letter-spacing:-.045em;
  margin-bottom:12px;
}
.stat-card span{
  display:block;
  min-height:62px;
  color:#61707e;
  font-size:14px;
}
.stat-card a{
  display:inline-block;
  margin-top:14px;
  color:var(--accent);
  font-size:12px;
  font-weight:720;
}
.about-grid{
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:18px;
  margin-top:22px;
}
.about-card{
  border:1px solid var(--line);
  border-radius:16px;
  padding:26px;
}
.about-card h3{
  font-size:22px;
  line-height:1.15;
  letter-spacing:-.025em;
  margin:8px 0 10px;
}
.about-card p{font-size:15px;margin:0}
.source-library{
  margin-top:32px;
  padding-top:32px;
  border-top:1px solid var(--line);
}
.source-library-head{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:40px;
  align-items:end;
}
.source-library-head h3{
  font-size:26px;
  letter-spacing:-.03em;
  margin:7px 0 0;
}
.source-library-head p{
  font-size:14px;
  margin:0;
}
.source-links{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:12px;
  margin-top:22px;
}
.source-card{
  border:1px solid var(--line);
  border-radius:12px;
  padding:18px;
  background:#fff;
  transition:border-color .15s ease, transform .15s ease, box-shadow .15s ease;
}
.source-card:hover{
  transform:translateY(-1px);
  border-color:#aebbc5;
  box-shadow:0 7px 18px rgba(13,23,34,.05);
}
.source-card strong{display:block;font-size:15px;margin-bottom:4px}
.source-card span{display:block;color:#6c7985;font-size:13px}
.independence-note{
  margin-top:26px;
  padding:16px 18px;
  border-radius:12px;
  background:#f6f8fa;
  color:#697783;
  font-size:13px;
}

/* Rich site footer */
.site-footer{
  background:#0d1722;
  color:#d9e0e6;
  padding:54px 0 24px;
}
.footer-grid{
  display:grid;
  grid-template-columns:1.45fr .9fr 1fr 1fr .8fr;
  gap:42px;
}
.site-footer .brand{color:#fff}
.footer-mark{
  background:transparent;
  border-color:#fff;
}
.footer-mark:before,.footer-mark:after{background:#fff}
.footer-brand p{
  max-width:330px;
  color:#9faeba;
  font-size:14px;
  margin:18px 0 20px;
}
.footer-cta{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:42px;
  padding:10px 15px;
  border-radius:9px;
  background:#fff;
  color:#0d1722;
  font-size:13px;
  font-weight:760;
}
.footer-column{
  display:flex;
  flex-direction:column;
  gap:10px;
}
.footer-column strong{
  color:#fff;
  font-size:13px;
  margin-bottom:4px;
}
.footer-column a{
  color:#9faeba;
  font-size:13px;
}
.footer-column a:hover{color:#fff}
.footer-bottom{
  margin-top:42px;
  padding-top:20px;
  border-top:1px solid rgba(255,255,255,.12);
  display:flex;
  justify-content:space-between;
  gap:18px;
  flex-wrap:wrap;
  color:#8393a0;
  font-size:12px;
}
@media(max-width:900px){
  .about-intro,
  .source-library-head{grid-template-columns:1fr}
  .stat-grid{grid-template-columns:1fr}
  .about-grid{grid-template-columns:1fr}
  .source-links{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:600px){
  .source-links{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column}
}


/* Contact page */
.contact-page{padding:70px 0 82px}
.contact-layout{
  display:grid;
  grid-template-columns:.95fr 1.05fr;
  gap:64px;
  align-items:start;
}
.contact-intro h1{
  font-size:50px;
  line-height:1.03;
  letter-spacing:-.05em;
  margin:14px 0 22px;
}
.contact-intro > p{
  font-size:18px;
  color:#5e6e7d;
  max-width:600px;
}
.contact-reasons{
  display:grid;
  gap:18px;
  margin-top:32px;
}
.contact-reasons div{
  padding-top:18px;
  border-top:1px solid var(--line);
}
.contact-reasons strong{
  display:block;
  font-size:15px;
  margin-bottom:4px;
}
.contact-reasons span{
  color:#71808c;
  font-size:14px;
}
.contact-card{
  background:#fff;
  border:1px solid var(--line);
  border-radius:20px;
  padding:30px;
  box-shadow:0 18px 45px rgba(13,23,34,.06);
}
.form-field{
  display:grid;
  gap:7px;
  margin-bottom:18px;
}
.form-field label{
  font-size:13px;
  font-weight:740;
  color:#2d3944;
}
.form-field input,
.form-field select,
.form-field textarea{
  width:100%;
  border:1px solid #cfd8df;
  border-radius:10px;
  background:#fff;
  color:var(--ink);
  font:inherit;
  padding:12px 13px;
  outline:none;
}
.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus{
  border-color:var(--accent);
  box-shadow:0 0 0 3px rgba(47,91,234,.10);
}
.form-field textarea{resize:vertical;min-height:150px}
.contact-submit{width:100%}
.contact-submit:disabled{opacity:.55;cursor:wait}
.form-status{
  min-height:22px;
  margin:12px 0 0;
  font-size:13px;
}
.form-status.success{color:#1f7a52}
.form-status.error{color:#a04444}
.honeypot-field{
  position:absolute;
  overflow:hidden;
  clip:rect(0 0 0 0);
  height:1px;
  width:1px;
  margin:-1px;
  padding:0;
  border:0;
}
.contact-footer{padding-top:26px}
@media(max-width:850px){
  .contact-layout{grid-template-columns:1fr;gap:34px}
  .contact-intro h1{font-size:40px}
}
@media(max-width:600px){
  .contact-page{padding:46px 0 60px}
  .contact-card{padding:22px 18px}
  .contact-intro h1{font-size:36px}
}


/* Task 9 QA hardening */
.score-explainer{
  margin-top:18px;
  padding:13px 15px;
  border:1px solid var(--line);
  border-radius:11px;
  background:#f8fafb;
  color:#687684;
  font-size:13px;
}
.choice:focus-visible,
.answer:focus-visible,
.primary:focus-visible,
.secondary-button:focus-visible,
.button-orange:focus-visible,
.text-button:focus-visible,
.text-link-button:focus-visible,
.footer-cta:focus-visible{
  outline:3px solid rgba(47,91,234,.28);
  outline-offset:3px;
}
@media print{
  .topbar,
  .results-actions,
  .site-footer,
  .contact-footer{
    display:none!important;
  }
  body{
    background:#fff!important;
  }
  .app-shell{
    max-width:none;
    padding:0!important;
  }
  .panel{
    border:0!important;
    box-shadow:none!important;
    padding:0!important;
    margin:0!important;
  }
  .setup-card,
  .summary-item,
  .score-box,
  .score-explainer{
    break-inside:avoid;
    box-shadow:none!important;
  }
  a{
    color:inherit!important;
    text-decoration:none!important;
  }
}


/* Task 10: legal/trust pages */
.legal-page{padding:68px 0 86px;background:#fff}
.legal-shell{max-width:820px}
.legal-page h1{
  font-size:48px;
  line-height:1.05;
  letter-spacing:-.045em;
  margin:13px 0 8px;
}
.legal-date{color:#7b8792!important;font-size:13px!important;margin:0 0 34px!important}
.legal-page h2{
  font-size:23px;
  line-height:1.2;
  letter-spacing:-.025em;
  margin:34px 0 10px;
}
.legal-page p{
  max-width:none;
  font-size:16px;
  line-height:1.72;
  color:#556472;
  margin:0 0 16px;
}
.legal-page a{color:var(--accent);text-decoration:underline;text-underline-offset:2px}
.legal-footer a{color:inherit}
@media(max-width:600px){
  .legal-page{padding:48px 0 62px}
  .legal-page h1{font-size:38px}
}

.contact-privacy-note{font-size:12px!important;line-height:1.55;color:#7a8792!important;margin:12px 0 0!important}
.contact-privacy-note a{color:var(--accent);text-decoration:underline;text-underline-offset:2px}


/* Task 11: SEO guide system */
.guide-hero{
  padding:58px 0 52px;
  background:#f6f8fa;
  border-bottom:1px solid var(--line);
}
.guide-shell{max-width:900px}
.breadcrumbs{
  display:flex;
  gap:8px;
  align-items:center;
  flex-wrap:wrap;
  font-size:12px;
  color:#7a8792;
  margin-bottom:28px;
}
.breadcrumbs a:hover{color:var(--ink)}
.guide-hero h1{
  font-size:50px;
  line-height:1.04;
  letter-spacing:-.05em;
  margin:12px 0 18px;
}
.guide-hero p{
  font-size:18px;
  line-height:1.65;
  color:#5e6e7d;
  max-width:780px;
  margin:0 0 24px;
}
.guide-content{padding:54px 0 80px;background:#fff}
.guide-answer{
  border:1px solid var(--line);
  border-radius:16px;
  padding:24px;
  background:#f8fafb;
}
.guide-answer p{
  margin:8px 0 0;
  font-size:17px;
  line-height:1.65;
  color:#394753;
}
.guide-context{
  margin-top:15px!important;
  font-size:14px!important;
  color:#687684!important;
  font-weight:400!important;
}
.guide-section{margin-top:52px}
.guide-section > h2,
.guide-cta h2{
  font-size:31px;
  line-height:1.12;
  letter-spacing:-.035em;
  margin:8px 0 10px;
}
.guide-section > p,
.guide-cta p{
  color:#647381;
  font-size:15px;
  max-width:760px;
  margin:0 0 24px;
}
.guide-protections{display:grid;gap:18px;margin-top:22px}
.guide-protection{
  border:1px solid var(--line);
  border-radius:16px;
  padding:26px;
  background:#fff;
}
.guide-protection-head{
  display:flex;
  justify-content:space-between;
  align-items:start;
  gap:20px;
}
.guide-protection h2{
  font-size:22px;
  line-height:1.15;
  letter-spacing:-.025em;
  margin:7px 0 0;
}
.guide-protection > p{
  font-size:15px;
  line-height:1.65;
  color:#62717e;
  margin:16px 0;
}
.guide-protection h3{
  font-size:14px;
  margin:22px 0 8px;
}
.guide-time{
  flex:none;
  padding:5px 8px;
  border-radius:999px;
  background:#eef2f5;
  color:#687684;
  font-size:11px;
  font-weight:760;
}
.guide-warning{
  padding:12px 14px;
  border-left:3px solid #d08a43;
  background:#fff9f2;
  color:#6d583e;
  font-size:13px;
  line-height:1.55;
}
.guide-steps{
  margin:0;
  padding-left:21px;
  color:#4f5e6b;
  font-size:14px;
  line-height:1.6;
}
.guide-steps li{margin:8px 0}
.guide-source{
  margin-top:18px;
  padding-top:14px;
  border-top:1px solid #edf1f4;
  font-size:12px;
  color:#7a8792;
}
.guide-source a{
  color:var(--accent);
  font-weight:680;
}
.guide-cta{
  margin-top:52px;
  padding:28px;
  border-radius:18px;
  background:#0d1722;
  color:#fff;
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:28px;
}
.guide-cta .question-meta{color:#9eb0bf}
.guide-cta h2{color:#fff;margin-bottom:8px}
.guide-cta p{color:#aebbc6;margin:0}
.related-guides{
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:12px;
  margin-top:20px;
}
.related-guide,
.guide-index-card{
  display:block;
  border:1px solid var(--line);
  border-radius:13px;
  padding:18px;
  background:#fff;
}
.related-guide:hover,
.guide-index-card:hover{
  border-color:#aebbc5;
  box-shadow:0 7px 18px rgba(13,23,34,.05);
}
.related-guide strong,
.guide-index-card strong{
  display:block;
  font-size:15px;
  margin-bottom:6px;
}
.related-guide span,
.guide-index-card span{
  display:block;
  color:#6b7986;
  font-size:13px;
  line-height:1.5;
}
.guide-index-group{margin-top:44px}
.guide-index-group:first-child{margin-top:0}
.guide-index-group h2{
  font-size:26px;
  letter-spacing:-.03em;
  margin:0 0 16px;
}
.guide-index-grid{
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:12px;
}
@media(max-width:720px){
  .guide-hero{padding:42px 0 40px}
  .guide-hero h1{font-size:39px}
  .guide-protection{padding:22px 18px}
  .guide-protection-head{display:block}
  .guide-time{display:inline-block;margin-top:10px}
  .guide-cta{display:block}
  .guide-cta .primary{margin-top:18px}
  .related-guides,
  .guide-index-grid{grid-template-columns:1fr}
}