:root{
  --ink: #16233F;
  --ink-soft: #2B3A5C;
  --parchment: #F3EEE1;
  --parchment-deep: #E9E2CE;
  --brass: #A9803D;
  --brass-light: #C8A567;
  --red: #7A2E2E;
  --text: #1B1B1F;
  --text-soft: #4A4A52;
  --serif: 'Fraunces', serif;
  --sans: 'Inter', sans-serif;
  --mono: 'IBM Plex Mono', monospace;
  --radius: 4px;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--parchment);
  color:var(--text);
  font-family:var(--sans);
  line-height:1.55;
}

.masthead{
  background:var(--ink);
  color:var(--parchment);
  padding:22px 24px 20px;
  border-bottom:3px solid var(--brass);
}
.masthead-inner{max-width:760px;margin:0 auto;}
.mark{display:flex;align-items:baseline;gap:10px;}
.mark-seal{
  font-family:var(--serif);
  font-size:1.6rem;
  color:var(--brass-light);
  line-height:1;
}
.mark-text{font-family:var(--serif);font-size:1.3rem;font-weight:600;letter-spacing:0.01em;}
.mark-accent{color:var(--brass-light);}
.masthead-tagline{
  margin:6px 0 0;
  font-size:0.82rem;
  color:#C7CEDD;
  text-transform:uppercase;
  letter-spacing:0.08em;
}
.tool-nav{margin-top:10px;}
.tool-nav a{
  color:#C7CEDD;
  font-size:0.8rem;
  text-decoration:none;
  border-bottom:1px solid transparent;
}
.tool-nav a:hover{border-bottom-color:var(--brass-light);}

main{max-width:760px;margin:0 auto;padding:0 24px;}

.hero{padding:48px 0 28px;}
.eyebrow{
  font-family:var(--mono);
  font-size:0.72rem;
  text-transform:uppercase;
  letter-spacing:0.09em;
  color:var(--brass);
  margin:0 0 14px;
}
.hero h1, main h1{
  font-family:var(--serif);
  font-size:clamp(1.9rem,4.5vw,2.7rem);
  font-weight:600;
  line-height:1.15;
  margin:0 0 16px;
  color:var(--ink);
}
.hero-sub{font-size:1.05rem;color:var(--text-soft);max-width:52ch;margin:0;}

.dossier{margin:0 0 40px;}
.dossier-body{
  background:#fff;
  border:1px solid var(--ink);
  border-radius:var(--radius);
  padding:32px;
}
@media (max-width:560px){.dossier-body{padding:22px 18px;}}

.field{margin-bottom:20px;}
.field label{
  display:block;
  font-size:0.85rem;
  font-weight:600;
  color:var(--ink-soft);
  margin-bottom:7px;
}
input[type="email"], input[type="text"]{
  width:100%;
  font-family:var(--mono);
  font-size:1rem;
  padding:11px 12px;
  border:1.5px solid #CFC9B8;
  border-radius:var(--radius);
  background:var(--parchment);
  color:var(--text);
}
input:focus{outline:2px solid var(--brass);outline-offset:1px;border-color:var(--brass);}

.submit-btn{
  width:100%;
  background:var(--ink);
  color:var(--parchment);
  border:none;
  padding:15px;
  font-family:var(--sans);
  font-weight:700;
  font-size:1rem;
  border-radius:var(--radius);
  cursor:pointer;
  transition:background 0.15s ease;
}
.submit-btn:hover{background:var(--ink-soft);}

.result-note{font-size:0.88rem;color:var(--text-soft);margin:0;}

.explainer{padding:36px 0;border-top:1px solid #DDD5BE;}
.explainer h2{
  font-family:var(--serif);
  font-size:1.5rem;
  color:var(--ink);
  margin:0 0 16px;
}
.formula-cards{display:flex;gap:16px;margin:20px 0;}
@media (max-width:520px){.formula-cards{flex-direction:column;}}
.formula-card{
  flex:1;
  background:#fff;
  border:1px solid #DDD5BE;
  border-left:3px solid var(--brass);
  padding:16px 18px;
  border-radius:var(--radius);
}
.formula-tag{
  display:block;
  font-family:var(--mono);
  font-size:0.72rem;
  text-transform:uppercase;
  letter-spacing:0.06em;
  color:var(--brass);
  margin-bottom:8px;
}
.formula-card p{margin:0;font-size:0.95rem;}

.site-footer{
  background:var(--ink);
  color:#C7CEDD;
  padding:28px 24px;
  margin-top:20px;
}
.disclaimer{max-width:760px;margin:0 auto 10px;font-size:0.82rem;line-height:1.6;}
.footer-meta{max-width:760px;margin:0 auto;font-family:var(--mono);font-size:0.74rem;color:#8A93AA;}