/* ==========================================================================
   AgeCalculator.ai — Design System
   Concept: "The Ledger" — a precise, almanac-style instrument for measuring
   time. Ink-navy paper, brass instrumentation, tabular ledger digits.
   ========================================================================== */

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

:root{
  /* Palette */
  --ink-900:#0E1A2E;
  --ink-800:#13223C;
  --ink-700:#1B2C4A;
  --ink-600:#243A5E;
  --parchment:#EDE7D6;
  --parchment-dim:#C9C2AC;
  --brass:#C9A24B;
  --brass-bright:#E0BC6C;
  --teal:#3E8E7E;
  --coral:#D9695F;
  --hair:rgba(237,231,214,0.14);
  --hair-strong:rgba(237,231,214,0.28);

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

  --radius-s:6px;
  --radius-m:10px;
  --radius-l:16px;
  --container:1120px;
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--ink-900);
  color:var(--parchment);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  background-image:
    radial-gradient(circle at 1px 1px, rgba(237,231,214,0.05) 1px, transparent 0);
  background-size:26px 26px;
}

a{color:var(--brass-bright);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;display:block}

:focus-visible{
  outline:2px solid var(--brass-bright);
  outline-offset:3px;
}

.container{
  max-width:var(--container);
  margin:0 auto;
  padding:0 24px;
}

h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:600;
  color:var(--parchment);
  line-height:1.15;
  margin:0 0 .5em;
}
h1{font-size:clamp(2rem,4.5vw,3.1rem);font-weight:700;letter-spacing:-.01em}
h2{font-size:clamp(1.4rem,3vw,2rem)}
h3{font-size:1.2rem}
p{margin:0 0 1em;color:var(--parchment-dim)}

.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--brass-bright);
  margin-bottom:14px;
}
.eyebrow::before{
  content:'';
  width:22px;height:1px;
  background:var(--brass-bright);
  display:inline-block;
}

/* ---------------- Header ---------------- */
.site-header{
  border-bottom:1px solid var(--hair);
  position:sticky; top:0; z-index:40;
  background:rgba(14,26,46,.92);
  backdrop-filter:blur(8px);
}
.site-header .row{
  display:flex;align-items:center;justify-content:space-between;
  height:72px;
}
.brand{
  display:flex;align-items:center;gap:10px;
  font-family:var(--font-display);
  font-size:1.25rem;font-weight:700;color:var(--parchment);
}
.brand .mark{
  width:34px;height:34px;border-radius:8px;
  background:linear-gradient(155deg,var(--brass) 0%, var(--brass-bright) 100%);
  display:flex;align-items:center;justify-content:center;
  color:var(--ink-900);font-family:var(--font-mono);font-weight:600;font-size:.85rem;
}
.brand:hover{text-decoration:none}
.brand .dot{color:var(--brass-bright)}

nav.main-nav{display:flex;gap:26px;align-items:center}
nav.main-nav a{
  font-size:.92rem;color:var(--parchment-dim);font-weight:500;
}
nav.main-nav a:hover{color:var(--parchment);text-decoration:none}

.nav-toggle{display:none;background:none;border:1px solid var(--hair-strong);color:var(--parchment);border-radius:var(--radius-s);padding:8px 10px;font-size:1rem}

/* ---------------- Hero ---------------- */
.hero{
  padding:64px 0 40px;
  border-bottom:1px solid var(--hair);
}
.hero .lede{max-width:660px;font-size:1.08rem}
.breadcrumbs{
  font-family:var(--font-mono);font-size:.76rem;color:var(--parchment-dim);
  margin-bottom:22px;letter-spacing:.02em;
}
.breadcrumbs a{color:var(--parchment-dim)}
.breadcrumbs a:hover{color:var(--brass-bright)}
.breadcrumbs .sep{margin:0 6px;opacity:.5}

/* ---------------- Calculator Card ---------------- */
.calc-shell{padding:0 0 56px}
.calc-card{
  background:var(--ink-700);
  border:1px solid var(--hair-strong);
  border-radius:var(--radius-l);
  padding:32px;
  position:relative;
  overflow:hidden;
  box-shadow:0 30px 60px -20px rgba(0,0,0,.5);
}
.calc-card::before{
  content:'';
  position:absolute; inset:0 0 auto 0; height:4px;
  background:linear-gradient(90deg,var(--brass) 0%, var(--teal) 100%);
}
.calc-card .ruler{
  display:flex; gap:3px; margin-bottom:22px; opacity:.55;
}
.calc-card .ruler span{width:1px;height:10px;background:var(--parchment-dim)}
.calc-card .ruler span:nth-child(5n){height:16px;background:var(--brass-bright)}

.field-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(200px,1fr));
  gap:18px;
  margin-bottom:22px;
}
.field label{
  display:block;font-family:var(--font-mono);font-size:.72rem;
  letter-spacing:.08em;text-transform:uppercase;color:var(--brass-bright);
  margin-bottom:8px;
}
.field input, .field select{
  width:100%;
  background:var(--ink-800);
  border:1px solid var(--hair-strong);
  color:var(--parchment);
  font-family:var(--font-body);
  font-size:1rem;
  padding:13px 14px;
  border-radius:var(--radius-s);
}
.field input::placeholder{color:var(--parchment-dim)}
.field input:focus, .field select:focus{border-color:var(--brass-bright)}
.field small{display:block;margin-top:6px;color:var(--parchment-dim);font-size:.78rem}

.field-inline{display:flex;gap:10px}
.field-inline .field{flex:1}

.btn{
  appearance:none;border:none;cursor:pointer;
  font-family:var(--font-body);font-weight:600;font-size:.98rem;
  padding:14px 28px;border-radius:var(--radius-s);
  background:var(--brass-bright);
  color:var(--ink-900);
  transition:transform .15s ease, background .15s ease;
}
.btn:hover{background:var(--brass);transform:translateY(-1px)}
.btn.secondary{
  background:transparent;border:1px solid var(--hair-strong);color:var(--parchment);
}
.btn.secondary:hover{border-color:var(--brass-bright);color:var(--brass-bright);background:transparent}
.btn-row{display:flex;gap:12px;flex-wrap:wrap;align-items:center}

/* ---------------- Results (the "ledger") ---------------- */
.result-panel{
  margin-top:28px;
  padding-top:26px;
  border-top:1px dashed var(--hair-strong);
  display:none;
}
.result-panel.is-visible{display:block; animation:reveal .35s ease}
@keyframes reveal{from{opacity:0; transform:translateY(6px)} to{opacity:1; transform:translateY(0)}}

.result-headline{
  font-family:var(--font-mono);
  font-size:.78rem;letter-spacing:.1em;text-transform:uppercase;
  color:var(--teal);margin-bottom:16px;
}

.digit-row{
  display:flex;flex-wrap:wrap;gap:14px;margin-bottom:22px;
}
.digit-card{
  background:var(--ink-800);
  border:1px solid var(--hair-strong);
  border-radius:var(--radius-m);
  padding:18px 22px;
  min-width:112px;
  text-align:center;
}
.digit-card .num{
  font-family:var(--font-mono);font-size:2rem;font-weight:600;color:var(--brass-bright);
  font-variant-numeric:tabular-nums;
}
.digit-card .unit{
  font-size:.74rem;letter-spacing:.08em;text-transform:uppercase;color:var(--parchment-dim);
  margin-top:4px;
}

.stat-grid{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));
  gap:1px; background:var(--hair-strong);
  border:1px solid var(--hair-strong); border-radius:var(--radius-m); overflow:hidden;
  margin-bottom:22px;
}
.stat-grid .stat{background:var(--ink-800);padding:16px 18px}
.stat-grid .stat .num{font-family:var(--font-mono);font-size:1.3rem;color:var(--parchment);font-variant-numeric:tabular-nums}
.stat-grid .stat .label{font-size:.76rem;color:var(--parchment-dim);margin-top:2px}

.result-note{
  font-size:.92rem;color:var(--parchment-dim);
  background:rgba(62,142,126,0.1);
  border:1px solid rgba(62,142,126,0.3);
  border-radius:var(--radius-s);
  padding:12px 16px;
}
.result-note.warn{background:rgba(217,105,95,0.1); border-color:rgba(217,105,95,0.35)}

/* ---------------- Content sections ---------------- */
.section{padding:52px 0;border-top:1px solid var(--hair)}
.section.tight{padding:36px 0}
.two-col{display:grid;grid-template-columns:1.1fr .9fr;gap:48px}
@media (max-width:860px){.two-col{grid-template-columns:1fr}}

.step-list{list-style:none;margin:0;padding:0;counter-reset:step}
.step-list li{
  counter-increment:step;
  display:grid;grid-template-columns:44px 1fr;gap:16px;
  padding:18px 0;border-top:1px solid var(--hair);
}
.step-list li:first-child{border-top:none}
.step-list li::before{
  content:counter(step,decimal-leading-zero);
  font-family:var(--font-mono);color:var(--brass-bright);font-size:.9rem;
}

.card-grid{
  display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));
  gap:16px;
}
.mini-card{
  background:var(--ink-700);border:1px solid var(--hair-strong);
  border-radius:var(--radius-m);padding:20px;
}
.mini-card h3{font-size:1rem;margin-bottom:6px}
.mini-card p{font-size:.9rem;margin:0}
.mini-card a{color:var(--parchment)}
.mini-card a:hover{color:var(--brass-bright)}

.faq{border-top:1px solid var(--hair)}
.faq-item{border-bottom:1px solid var(--hair)}
.faq-item summary{
  cursor:pointer;padding:18px 0;font-weight:600;color:var(--parchment);
  list-style:none;display:flex;justify-content:space-between;align-items:center;gap:16px;
  font-family:var(--font-display);
}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:'+';font-family:var(--font-mono);color:var(--brass-bright);font-size:1.3rem}
.faq-item[open] summary::after{content:'\2212'}
.faq-item p{padding-bottom:18px;margin:0}

.related-grid{
  display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));
  gap:12px;
}
.related-grid a{
  display:block;padding:14px 16px;background:var(--ink-700);
  border:1px solid var(--hair-strong);border-radius:var(--radius-s);
  font-size:.9rem;color:var(--parchment);
}
.related-grid a:hover{border-color:var(--brass-bright);color:var(--brass-bright);text-decoration:none}

.category-band{
  background:var(--ink-800);border-top:1px solid var(--hair);border-bottom:1px solid var(--hair);
  padding:48px 0;
}
.category-band h2{margin-bottom:28px}
.category-cols{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:28px}
.category-cols h4{font-family:var(--font-mono);font-size:.8rem;letter-spacing:.06em;text-transform:uppercase;color:var(--brass-bright);margin-bottom:12px}
.category-cols ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:8px}
.category-cols a{color:var(--parchment-dim);font-size:.92rem}
.category-cols a:hover{color:var(--brass-bright)}

/* ---------------- Footer ---------------- */
.site-footer{
  border-top:1px solid var(--hair);
  padding:48px 0 32px;
  background:var(--ink-800);
}
.footer-grid{display:grid;grid-template-columns:1.4fr repeat(3,1fr);gap:32px;margin-bottom:36px}
@media (max-width:760px){.footer-grid{grid-template-columns:1fr 1fr}}
.footer-grid h4{font-family:var(--font-mono);font-size:.76rem;letter-spacing:.08em;text-transform:uppercase;color:var(--brass-bright);margin-bottom:14px}
.footer-grid ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:8px}
.footer-grid a{color:var(--parchment-dim);font-size:.88rem}
.footer-grid a:hover{color:var(--brass-bright)}
.footer-bottom{
  display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px;
  padding-top:24px;border-top:1px solid var(--hair);
  font-size:.82rem;color:var(--parchment-dim);
}

/* ---------------- Utility ---------------- */
.pill{
  display:inline-block;font-family:var(--font-mono);font-size:.7rem;
  letter-spacing:.06em;text-transform:uppercase;color:var(--ink-900);
  background:var(--teal);padding:4px 10px;border-radius:999px;
}

@media (max-width:760px){
  nav.main-nav{
    position:fixed;inset:72px 0 0 0;background:var(--ink-900);
    flex-direction:column;align-items:flex-start;padding:28px 24px;
    gap:20px; transform:translateX(100%); transition:transform .25s ease;
    border-top:1px solid var(--hair);
  }
  nav.main-nav.is-open{transform:translateX(0)}
  .nav-toggle{display:block}
  .two-col{gap:32px}
  .calc-card{padding:22px}
}