: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 */
.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;
}

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

/* Hero */
.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{
  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 */
.dossier{margin:0 0 56px;}
.dossier-tabs{display:flex;gap:2px;}
.tab{
  font-family:var(--sans);
  font-weight:600;
  font-size:0.92rem;
  padding:13px 22px;
  border:1px solid var(--ink);
  border-bottom:none;
  background:var(--parchment-deep);
  color:var(--ink-soft);
  border-radius:var(--radius) var(--radius) 0 0;
  cursor:pointer;
  opacity:0.6;
  transition:opacity 0.15s ease;
}
.tab.active{
  background:#fff;
  opacity:1;
  color:var(--ink);
}
.dossier-body{
  background:#fff;
  border:1px solid var(--ink);
  border-radius:0 var(--radius) var(--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;
}
.field-row{display:flex;gap:16px;}
.field-row .field{flex:1;}
@media (max-width:480px){.field-row{flex-direction:column;gap:0;}}

input[type="number"],input[type="date"]{
  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);}

.input-suffix{position:relative;}
.input-suffix input{padding-right:34px;}
.input-suffix span{
  position:absolute;right:12px;top:50%;transform:translateY(-50%);
  font-family:var(--mono);color:var(--text-soft);
}

.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 */
.result{
  margin-top:28px;
  padding-top:28px;
  border-top:1px dashed #CFC9B8;
  display:flex;
  gap:22px;
  align-items:flex-start;
}
@media (max-width:480px){.result{flex-direction:column;align-items:center;text-align:center;}}

.stamp{flex-shrink:0;width:104px;animation:stamp-in 0.35s ease-out;}
.stamp svg{width:100%;height:auto;}
.stamp circle{fill:none;stroke:var(--red);stroke-width:2.5;}
.stamp text{font-family:var(--mono);font-size:11px;fill:var(--red);font-weight:600;}
.stamp-sub{font-size:8px;letter-spacing:0.05em;}
@keyframes stamp-in{
  0%{transform:scale(2.2) rotate(-18deg);opacity:0;}
  60%{transform:scale(0.94) rotate(-8deg);opacity:1;}
  100%{transform:scale(1) rotate(-8deg);opacity:1;}
}
.stamp svg{transform:rotate(-8deg);}

.result-label{
  font-family:var(--mono);
  font-size:0.78rem;
  text-transform:uppercase;
  letter-spacing:0.06em;
  color:var(--text-soft);
  margin:0 0 4px;
}
.result-amount{
  font-family:var(--serif);
  font-size:2.6rem;
  font-weight:600;
  color:var(--ink);
  margin:0 0 14px;
}
.result-detail{
  font-family:var(--mono);
  font-size:0.85rem;
  color:var(--text-soft);
  margin:0 0 12px;
  display:grid;
  grid-template-columns:auto 1fr;
  gap:4px 14px;
}
.result-detail dt{color:var(--ink-soft);}
.result-note{font-size:0.88rem;color:var(--text-soft);margin:0;}

/* Explainer sections */
.explainer{padding:36px 0;border-top:1px solid #DDD5BE;}
.explainer.alt{background:var(--parchment-deep);margin:0 -24px;padding:36px 24px;}
.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;}

.compare-grid{display:flex;gap:24px;margin-top:20px;}
@media (max-width:560px){.compare-grid{flex-direction:column;}}
.compare-col{flex:1;}
.compare-col h3{
  font-family:var(--sans);
  font-size:1rem;
  color:var(--ink);
  border-bottom:2px solid var(--brass);
  padding-bottom:8px;
  margin:0 0 12px;
}
.compare-col ul{margin:0;padding-left:18px;}
.compare-col li{margin-bottom:8px;font-size:0.93rem;}

/* FAQ */
.faq{padding:36px 0 48px;border-top:1px solid #DDD5BE;}
.faq h2{font-family:var(--serif);font-size:1.5rem;color:var(--ink);margin:0 0 18px;}
.faq details{
  border-bottom:1px solid #DDD5BE;
  padding:14px 0;
}
.faq summary{
  cursor:pointer;
  font-weight:600;
  color:var(--ink-soft);
  list-style:none;
  position:relative;
  padding-right:24px;
}
.faq summary::-webkit-details-marker{display:none;}
.faq summary::after{
  content:'+';
  position:absolute;right:0;top:0;
  font-family:var(--serif);
  font-size:1.2rem;
  color:var(--brass);
}
.faq details[open] summary::after{content:'–';}
.faq details p{margin:10px 0 0;color:var(--text-soft);font-size:0.94rem;}

/* Footer */
.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;}

@media (prefers-reduced-motion: reduce){
  .stamp{animation:none;}
}