/* ==========================================================================
   AI Checkers — shared design system
   Identity: a text-diagnostics / verification-stamp aesthetic.
   Deep slate background, amber signal accent, teal "verified" accent,
   coral used sparingly for AI-flagged states.
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,400;9..144,500;9..144,600;9..144,700&family=IBM+Plex+Sans:wght@400;500;600;700&family=IBM+Plex+Mono:wght@400;500;600&display=swap');

:root{
  --bg:#12161a;
  --bg-raise:#171d22;
  --card:#1c2329;
  --card-border:#28313a;
  --ink:#eef1f2;
  --muted:#8b96a1;
  --muted-dim:#5f6a74;
  --amber:#e8a33d;
  --amber-deep:#c98526;
  --teal:#4fb0a5;
  --teal-deep:#377c74;
  --coral:#e2654f;

  --font-display:'Fraunces', Georgia, serif;
  --font-body:'IBM Plex Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono:'IBM Plex Mono', 'Courier New', monospace;

  --radius:10px;
  --radius-lg:18px;
  --max:1120px;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
img,svg{max-width:100%;display:block;}
a{color:inherit;}
.container{max-width:var(--max);margin:0 auto;padding:0 24px;}

h1,h2,h3{
  font-family:var(--font-display);
  font-weight:600;
  line-height:1.15;
  margin:0 0 0.5em;
  letter-spacing:-0.01em;
}
h1{font-size:clamp(34px,5.4vw,58px);font-weight:700;}
h2{font-size:clamp(26px,3.6vw,38px);}
h3{font-size:20px;}
p{margin:0 0 1em;color:var(--ink);}
.lede{font-size:18px;color:var(--muted);max-width:640px;}

.eyebrow{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:0.16em;
  text-transform:uppercase;
  color:var(--teal);
  margin-bottom:12px;
  display:inline-block;
}

/* ---------- nav ---------- */
.site-nav{
  border-bottom:1px solid var(--card-border);
  background:rgba(18,22,26,0.9);
  backdrop-filter:blur(8px);
  position:sticky;
  top:0;
  z-index:50;
}
.site-nav .container{
  display:flex;
  align-items:center;
  justify-content:space-between;
  height:68px;
}
.brand{
  display:flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-display);
  font-weight:700;
  font-size:19px;
  text-decoration:none;
  color:var(--ink);
}
.brand .mark{width:26px;height:26px;flex-shrink:0;}
.nav-links{display:flex;gap:28px;align-items:center;}
.nav-links a{
  font-size:14.5px;
  text-decoration:none;
  color:var(--muted);
  transition:color .15s ease;
}
.nav-links a:hover{color:var(--ink);}
.nav-cta{
  font-family:var(--font-mono);
  font-size:13px;
  background:var(--amber);
  color:#1a1305;
  padding:9px 18px;
  border-radius:999px;
  text-decoration:none;
  font-weight:600;
  letter-spacing:0.02em;
}
.nav-toggle{display:none;}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:14px;
  font-weight:600;
  letter-spacing:0.02em;
  padding:13px 26px;
  border-radius:999px;
  border:none;
  cursor:pointer;
  text-decoration:none;
  transition:transform .12s ease, background .15s ease;
}
.btn:hover{transform:translateY(-1px);}
.btn-primary{background:var(--amber);color:#1a1305;}
.btn-primary:hover{background:#f0ae4c;}
.btn-ghost{background:transparent;color:var(--ink);border:1px solid var(--card-border);}
.btn-ghost:hover{border-color:var(--muted);}
.btn:disabled{opacity:0.4;cursor:not-allowed;transform:none;}

/* ---------- sections ---------- */
section{padding:88px 0;}
.section-tight{padding:64px 0;}
.section-head{max-width:640px;margin-bottom:48px;}
.alt-bg{background:var(--bg-raise);}

/* ---------- hero ---------- */
.hero{padding:56px 0 80px;position:relative;overflow:hidden;}
.hero-grid{
  display:grid;
  grid-template-columns:1.05fr 1fr;
  gap:56px;
  align-items:start;
}
.hero-copy .lede{margin-bottom:28px;}
.hero-actions{display:flex;gap:14px;align-items:center;flex-wrap:wrap;margin-bottom:36px;}
.hero-trust{
  display:flex;
  gap:22px;
  flex-wrap:wrap;
  font-family:var(--font-mono);
  font-size:12.5px;
  color:var(--muted-dim);
}
.hero-trust span{display:flex;align-items:center;gap:6px;}
.hero-trust .dot{width:6px;height:6px;border-radius:50%;background:var(--teal);}

/* stamp signature graphic */
.stamp{
  position:absolute;
  width:118px;
  height:118px;
  right:6%;
  top:24px;
  transform:rotate(-9deg);
  opacity:0.9;
}

/* ---------- tool widget (hero + embed) ---------- */
.tool-panel{
  background:var(--card);
  border:1px solid var(--card-border);
  border-radius:var(--radius-lg);
  padding:22px;
  box-shadow:0 20px 60px rgba(0,0,0,0.35);
}
.tool-panel .panel-label{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:0.14em;
  text-transform:uppercase;
  color:var(--muted-dim);
  margin-bottom:10px;
}
.tool-panel textarea{
  width:100%;
  min-height:180px;
  background:#0e1216;
  color:var(--ink);
  border:1px solid var(--card-border);
  border-radius:8px;
  padding:16px;
  font-family:var(--font-body);
  font-size:14.5px;
  line-height:1.6;
  resize:vertical;
}
.tool-panel textarea:focus{outline:2px solid var(--teal);outline-offset:1px;}
.tool-row{
  display:flex;
  justify-content:space-between;
  align-items:center;
  margin-top:12px;
  gap:10px;
  flex-wrap:wrap;
}
.tool-count{font-family:var(--font-mono);font-size:12px;color:var(--muted-dim);}
.sample-link{background:none;border:none;color:var(--muted);text-decoration:underline;font-size:12.5px;cursor:pointer;padding:0;font-family:var(--font-body);}
.sample-link:hover{color:var(--ink);}

#toolResults{display:none;margin-top:22px;padding-top:22px;border-top:1px solid var(--card-border);}
.verdict-row{display:flex;align-items:flex-end;gap:18px;flex-wrap:wrap;margin-bottom:16px;}
.verdict-score{font-family:var(--font-mono);font-weight:700;font-size:44px;line-height:1;}
.verdict-label{font-size:11.5px;letter-spacing:0.12em;text-transform:uppercase;color:var(--muted-dim);margin-bottom:6px;}
.verdict-tag{font-family:var(--font-mono);font-size:12.5px;padding:5px 12px;border-radius:999px;}
.tag-human{background:rgba(79,176,165,0.16);color:var(--teal);border:1px solid var(--teal-deep);}
.tag-mixed{background:rgba(232,163,61,0.16);color:var(--amber);border:1px solid var(--amber-deep);}
.tag-ai{background:rgba(226,101,79,0.16);color:var(--coral);border:1px solid var(--coral);}
svg#toolPulse{width:100%;height:70px;display:block;margin-bottom:16px;}
.marked-label{font-family:var(--font-mono);font-size:10.5px;letter-spacing:0.1em;text-transform:uppercase;color:var(--muted-dim);margin-bottom:8px;}
.marked-text{font-size:14.5px;line-height:1.8;color:#d7dde0;}
.marked-text mark{background:rgba(226,101,79,0.22);color:inherit;padding:0 1px;border-radius:2px;}

.tool-disclaimer{
  display:flex;gap:10px;align-items:flex-start;
  background:rgba(232,163,61,0.08);
  border:1px solid rgba(232,163,61,0.3);
  border-radius:8px;
  padding:12px 14px;
  margin-top:16px;
  font-size:12.5px;
  line-height:1.5;
  color:#d9cbb0;
}
.tool-disclaimer strong{color:var(--amber);}

/* ---------- content sections with graphic ---------- */
.split{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:56px;
  align-items:center;
}
.split.reverse .split-art{order:2;}
.split.reverse .split-copy{order:1;}
.split-art{background:var(--card);border:1px solid var(--card-border);border-radius:var(--radius-lg);padding:28px;}
.split-copy ul{padding-left:20px;margin:0 0 1em;color:var(--muted);}
.split-copy li{margin-bottom:8px;}

/* steps */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:28px;}
.step{background:var(--card);border:1px solid var(--card-border);border-radius:var(--radius);padding:26px;}
.step .step-num{font-family:var(--font-mono);font-size:13px;color:var(--teal);margin-bottom:14px;}
.step svg{width:44px;height:44px;margin-bottom:16px;}

/* use-case grid */
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;}
.usecase{background:var(--card);border:1px solid var(--card-border);border-radius:var(--radius);padding:22px;}
.usecase svg{width:36px;height:36px;margin-bottom:14px;color:var(--amber);}
.usecase h3{font-size:16.5px;margin-bottom:6px;}
.usecase p{font-size:14px;color:var(--muted);margin:0;}

/* gauge */
.gauge-wrap{display:flex;flex-direction:column;align-items:center;text-align:center;}
.gauge-legend{display:flex;gap:18px;margin-top:14px;flex-wrap:wrap;justify-content:center;font-family:var(--font-mono);font-size:12px;color:var(--muted);}
.gauge-legend span{display:flex;align-items:center;gap:6px;}
.gauge-legend i{width:9px;height:9px;border-radius:50%;display:inline-block;}

/* signal list */
.signal-list{display:grid;gap:14px;margin-top:20px;}
.signal-item{display:flex;gap:14px;align-items:flex-start;background:var(--card);border:1px solid var(--card-border);border-radius:var(--radius);padding:16px 18px;}
.signal-item svg{width:26px;height:26px;flex-shrink:0;color:var(--teal);}
.signal-item h3{font-size:15.5px;margin-bottom:3px;}
.signal-item p{font-size:14px;color:var(--muted);margin:0;}

/* FAQ */
.faq-item{border-bottom:1px solid var(--card-border);padding:20px 0;}
.faq-item summary{
  cursor:pointer;
  font-family:var(--font-display);
  font-size:17px;
  font-weight:600;
  list-style:none;
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:16px;
}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary .plus{font-family:var(--font-mono);color:var(--teal);font-size:20px;transition:transform .15s ease;}
.faq-item[open] summary .plus{transform:rotate(45deg);}
.faq-item p{color:var(--muted);margin-top:12px;margin-bottom:0;}

/* final CTA */
.cta-band{
  background:linear-gradient(135deg,#1a2128,#12161a);
  border:1px solid var(--card-border);
  border-radius:var(--radius-lg);
  padding:56px;
  text-align:center;
}
.cta-band h2{margin-bottom:14px;}
.cta-band .lede{margin:0 auto 28px;}

/* ---------- footer ---------- */
footer.site-footer{border-top:1px solid var(--card-border);padding:48px 0 32px;background:var(--bg-raise);}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:32px;margin-bottom:32px;}
.footer-brand p{color:var(--muted);font-size:14px;max-width:320px;}
.footer-col h4{font-family:var(--font-mono);font-size:12px;letter-spacing:0.12em;text-transform:uppercase;color:var(--muted-dim);margin-bottom:14px;}
.footer-col a{display:block;color:var(--muted);text-decoration:none;font-size:14.5px;margin-bottom:10px;}
.footer-col a:hover{color:var(--ink);}
.footer-bottom{border-top:1px solid var(--card-border);padding-top:20px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;font-size:13px;color:var(--muted-dim);}

/* ---------- simple pages (about/contact/privacy/disclaimer) ---------- */
.page-hero{padding:64px 0 32px;}
.page-hero .eyebrow{margin-bottom:16px;}
.prose{max-width:760px;}
.prose h2{margin-top:1.6em;}
.prose p, .prose li{color:var(--muted);font-size:16px;}
.prose strong{color:var(--ink);}
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;}
.contact-card{background:var(--card);border:1px solid var(--card-border);border-radius:var(--radius);padding:28px;}
.contact-card h3{margin-bottom:6px;}
.contact-card a{color:var(--teal);text-decoration:none;}
.form-field{margin-bottom:16px;}
.form-field label{display:block;font-size:13px;color:var(--muted);margin-bottom:6px;font-family:var(--font-mono);}
.form-field input,.form-field textarea{
  width:100%;background:#0e1216;border:1px solid var(--card-border);border-radius:8px;
  padding:12px 14px;color:var(--ink);font-family:var(--font-body);font-size:14.5px;
}
.form-field textarea{min-height:120px;resize:vertical;}

/* ---------- responsive ---------- */
@media (max-width:880px){
  .nav-links{display:none;}
  .hero-grid{grid-template-columns:1fr;}
  .split{grid-template-columns:1fr;}
  .split.reverse .split-art{order:1;}
  .split.reverse .split-copy{order:2;}
  .steps{grid-template-columns:1fr;}
  .grid-4{grid-template-columns:1fr 1fr;}
  .footer-grid{grid-template-columns:1fr;}
  .contact-grid{grid-template-columns:1fr;}
  .stamp{display:none;}
  .cta-band{padding:36px 22px;}
}

@media (prefers-reduced-motion: reduce){
  *{scroll-behavior:auto !important; transition:none !important;}
}