:root{
  --ink: #0F1B2B;
  --panel: #16283F;
  --panel-2: #1D3350;
  --paper: #EDE6D6;
  --brass: #C9A227;
  --brass-bright: #E0BC4A;
  --sage: #5B9279;
  --text: #EAE6DA;
  --text-dim: #9FB0C4;
  --line: rgba(234,230,218,0.14);
}
*{box-sizing:border-box;}
html,body{margin:0;padding:0;}
body{
  background: var(--ink);
  color: var(--text);
  font-family: 'Inter', sans-serif;
  -webkit-font-smoothing: antialiased;
  min-height:100vh;
}
a{ color: var(--brass-bright); }
.wrap{
  max-width: 880px;
  margin: 0 auto;
  padding: 32px 20px 64px;
}
/* ---- shared header ---- */
header.site-header{
  display:flex;
  justify-content:space-between;
  align-items:center;
  margin-bottom: 32px;
  gap: 12px;
  flex-wrap: wrap;
  max-width: 880px;
  margin-left:auto;
  margin-right:auto;
  padding: 24px 20px 0;
}
.brand{
  font-family:'Fraunces', serif;
  font-size: 19px;
  font-weight: 500;
  letter-spacing: 0.01em;
  color: var(--text);
  text-decoration:none;
}
.brand .dot{ color: var(--brass); }
nav.site-nav{
  display:flex;
  gap:18px;
  align-items:center;
  flex-wrap: wrap;
}
nav.site-nav a{
  color: var(--text-dim);
  text-decoration:none;
  font-size: 14px;
}
nav.site-nav a:hover{ color: var(--text); }
.lang-switch{
  display:flex;
  gap:6px;
}
.lang-switch a{
  border:1px solid var(--line);
  border-radius:6px;
  padding:4px 9px;
  font-size:12.5px;
  color: var(--text-dim);
  text-decoration:none;
}
.lang-switch a.current{
  background: var(--brass);
  color:#1a1406;
  border-color: var(--brass);
}
select{
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 7px 10px;
  font-family: 'Inter', sans-serif;
  font-size: 13px;
  cursor: pointer;
}
select:focus-visible, input:focus-visible, button:focus-visible, .toggle button:focus-visible, a:focus-visible{
  outline: 2px solid var(--brass-bright);
  outline-offset: 2px;
}
h1.hero{
  font-family: 'Fraunces', serif;
  font-weight: 400;
  font-size: clamp(30px, 5vw, 44px);
  line-height: 1.15;
  margin: 0 0 10px;
  max-width: 620px;
}
p.sub{
  color: var(--text-dim);
  font-size: 16px;
  max-width: 520px;
  margin: 0 0 36px;
  line-height: 1.5;
}
.card{
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 28px;
}
.mode-toggle{
  display:inline-flex;
  background: var(--ink);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 3px;
  margin-bottom: 28px;
}
.mode-toggle button{
  border: none;
  background: transparent;
  color: var(--text-dim);
  font-family: 'Inter', sans-serif;
  font-size: 13px;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: 999px;
  cursor: pointer;
  transition: background .2s, color .2s;
}
.mode-toggle button.active{
  background: var(--brass);
  color: #1a1406;
}
.grid{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px 24px;
}
@media (max-width: 560px){ .grid{ grid-template-columns: 1fr; } }
.field{ display:flex; flex-direction: column; gap: 6px; }
.field label{
  font-size: 12.5px;
  color: var(--text-dim);
  display:flex;
  justify-content: space-between;
}
.field label .val{ color: var(--brass-bright); font-family: 'IBM Plex Mono', monospace; }
.field input[type="number"]{
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--line);
  color: var(--text);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 20px;
  padding: 6px 2px;
  width: 100%;
  transition: border-color .15s;
}
.field input[type="number"]:focus{ border-bottom-color: var(--brass-bright); }
.field input[type="range"]{ width: 100%; accent-color: var(--brass); }
.divider{ border: none; border-top: 1px solid var(--line); margin: 28px 0; }
.result{ text-align: center; padding: 8px 0 4px; }
.result .label{
  font-size: 13px;
  color: var(--text-dim);
  letter-spacing: 0.03em;
  text-transform: uppercase;
  margin-bottom: 10px;
}
.result .figure{
  font-family: 'IBM Plex Mono', monospace;
  font-weight: 600;
  font-size: clamp(32px, 6vw, 54px);
  color: var(--brass-bright);
  line-height: 1.1;
}
.result .figure .unit{
  font-size: 0.4em;
  color: var(--text-dim);
  font-family: 'Inter', sans-serif;
  margin-left: 6px;
}
.result .sub{
  color: var(--text-dim);
  font-size: 14px;
  margin-top: 10px;
  max-width: 440px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.5;
}
.runway{ margin-top: 32px; }
.runway .ages{
  display:flex;
  justify-content: space-between;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 13px;
  color: var(--text-dim);
  margin-bottom: 8px;
}
.runway .track{
  position: relative;
  height: 34px;
  background: repeating-linear-gradient(
    90deg,
    transparent, transparent calc(100%/30 - 1px),
    var(--line) calc(100%/30 - 1px), var(--line) calc(100%/30)
  );
  border-radius: 4px;
  border: 1px solid var(--line);
  overflow: hidden;
}
.runway .fill{
  position:absolute; top:0; left:0; bottom:0;
  width: 0%;
  background: linear-gradient(90deg, var(--sage), var(--brass));
  transition: width 1s cubic-bezier(.16,1,.3,1);
}
.runway .marker{
  position:absolute; top: 50%; left: 0%;
  transform: translate(-50%,-50%);
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--ink);
  transition: left 1s cubic-bezier(.16,1,.3,1);
}
.runway .caption{ font-size: 12px; color: var(--text-dim); margin-top: 8px; text-align: center; }

/* ---- articles / legal pages ---- */
main.prose{
  max-width: 680px;
  margin: 0 auto;
  padding: 8px 20px 64px;
  line-height: 1.7;
  font-size: 16.5px;
}
main.prose h1{
  font-family:'Fraunces', serif;
  font-weight: 400;
  font-size: clamp(28px, 4.5vw, 38px);
  line-height:1.2;
  margin-bottom: 6px;
}
main.prose .meta{
  color: var(--text-dim);
  font-size: 13px;
  margin-bottom: 32px;
}
main.prose h2{
  font-family:'Fraunces', serif;
  font-weight:500;
  font-size: 24px;
  margin-top: 40px;
  margin-bottom: 12px;
  color: var(--paper);
}
main.prose p{ color: var(--text); margin-bottom: 18px; }
main.prose ul, main.prose ol{ color: var(--text); margin-bottom: 18px; padding-left: 22px; }
main.prose li{ margin-bottom: 8px; }
main.prose .callout{
  background: var(--panel);
  border-left: 3px solid var(--brass);
  border-radius: 6px;
  padding: 16px 20px;
  margin: 24px 0;
  font-size: 15px;
  color: var(--text-dim);
}
main.prose .cta{
  display:inline-block;
  margin-top: 20px;
  background: var(--brass);
  color: #1a1406;
  text-decoration:none;
  font-weight: 600;
  padding: 10px 18px;
  border-radius: 8px;
  font-size: 14px;
}
main.prose .related{
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}
main.prose .related h3{
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: .04em;
  color: var(--text-dim);
  margin-bottom: 12px;
}
main.prose .related a{ display:block; margin-bottom: 8px; font-size: 15px; }

footer.site-footer{
  margin-top: 40px;
  color: var(--text-dim);
  font-size: 12px;
  line-height: 1.8;
  text-align: center;
  max-width: 680px;
  margin-left:auto;
  margin-right:auto;
  padding: 0 20px 40px;
}
footer.site-footer a{ color: var(--text-dim); margin: 0 6px; }

@media (prefers-reduced-motion: reduce){
  .runway .fill, .runway .marker{ transition: none; }
}