/* Date of Birth Calculator - shared stylesheet
   Mobile-first, no external font/CSS requests, fast paint. */

:root{
  --blue-600:#2454ff;
  --blue-700:#1a3fd6;
  --blue-50:#eef2ff;
  --ink-900:#12141c;
  --ink-700:#3a3f4c;
  --ink-500:#666c7a;
  --line:#e4e7ee;
  --bg:#ffffff;
  --bg-soft:#f6f8fc;
  --green-600:#0e9f6e;
  --amber-600:#c2760c;
  --radius:14px;
  --radius-sm:8px;
  --shadow:0 2px 10px rgba(18,20,28,.06), 0 1px 2px rgba(18,20,28,.04);
  --maxw:1120px;
  font-size:16px;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  color:var(--ink-900);
  background:var(--bg);
  line-height:1.55;
}
img{max-width:100%;display:block}
a{color:var(--blue-600);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3,h4{line-height:1.2;margin:0 0 .5em;font-weight:800;letter-spacing:-.01em}
h1{font-size:clamp(1.7rem,4vw,2.5rem)}
h2{font-size:clamp(1.3rem,3vw,1.7rem);margin-top:2em}
h3{font-size:1.15rem;margin-top:1.4em}
p{margin:0 0 1em}
ul,ol{margin:0 0 1em;padding-left:1.3em}
li{margin-bottom:.35em}
.container{max-width:var(--maxw);margin:0 auto;padding:0 18px}

/* Skip link */
.skip-link{position:absolute;left:-999px;top:0;background:var(--blue-600);color:#fff;padding:10px 16px;border-radius:0 0 8px 0;z-index:200}
.skip-link:focus{left:0}

/* Header */
.site-header{border-bottom:1px solid var(--line);position:sticky;top:0;background:rgba(255,255,255,.97);backdrop-filter:blur(6px);z-index:100}
.site-header .container{display:flex;align-items:center;justify-content:space-between;min-height:64px;padding-top:10px;padding-bottom:10px;flex-wrap:wrap;gap:8px 14px}
.brand{display:flex;align-items:center;gap:9px;font-weight:800;font-size:1.05rem;color:var(--ink-900)}
.brand:hover{text-decoration:none}
.brand-mark{width:32px;height:32px;border-radius:9px;background:linear-gradient(135deg,var(--blue-600),#5b7dff);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:800;font-size:.95rem;flex:none}
.main-nav{display:none}
.main-nav ul{display:flex;flex-wrap:wrap;gap:8px 16px;list-style:none;margin:0;padding:0}
.main-nav a{color:var(--ink-700);font-weight:600;font-size:.88rem;white-space:nowrap}
.main-nav a:hover{color:var(--blue-600);text-decoration:none}
.nav-toggle{display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;border-radius:8px;border:1px solid var(--line);background:#fff;flex:none}
.nav-toggle svg{width:20px;height:20px}
.mobile-nav{display:none;border-top:1px solid var(--line);background:#fff}
.mobile-nav.open{display:block}
.mobile-nav ul{list-style:none;margin:0;padding:10px 0}
.mobile-nav a{display:block;padding:10px 18px;color:var(--ink-700);font-weight:600}

@media (min-width:900px){
  .main-nav{display:block}
  .nav-toggle{display:none}
}

/* Language switcher - desktop: dropdown built from <details>/<summary>, no JS needed */
details.lang-switch{display:none;position:relative;margin-left:4px}
@media (min-width:900px){
  .site-header .container details.lang-switch{display:block}
}
details.lang-switch summary{
  list-style:none;cursor:pointer;display:flex;align-items:center;gap:5px;
  padding:7px 10px;border:1.5px solid var(--line);border-radius:8px;
  font-size:.82rem;font-weight:700;color:var(--ink-700);background:#fff;white-space:nowrap;
}
details.lang-switch summary::-webkit-details-marker{display:none}
details.lang-switch summary::marker{content:""}
details.lang-switch summary:hover{border-color:var(--blue-600);color:var(--blue-600)}
details.lang-switch[open] summary{border-color:var(--blue-600);color:var(--blue-600);background:var(--blue-50)}
.lang-caret{font-size:.7em;line-height:1}
details.lang-switch[open] .lang-caret{transform:rotate(180deg)}
.lang-menu{
  position:absolute;top:calc(100% + 6px);right:0;background:#fff;border:1px solid var(--line);
  border-radius:10px;box-shadow:var(--shadow);padding:6px;display:flex;flex-direction:column;
  min-width:150px;z-index:150;
}
.lang-menu a{padding:8px 10px;border-radius:6px;color:var(--ink-700);font-weight:600;font-size:.9rem;white-space:nowrap}
.lang-menu a:hover{background:var(--bg-soft);color:var(--blue-600);text-decoration:none}
.lang-menu a.current{background:var(--blue-50);color:var(--blue-600)}
[dir="rtl"] .lang-menu{right:auto;left:0}

/* Language switcher - mobile: flat list inside the slide-out menu, already collapsed once */
.mobile-nav .lang-switch{display:flex;flex-wrap:wrap;gap:6px;padding:10px 18px 16px;border-top:1px solid var(--line);margin-top:6px}
.mobile-nav .lang-switch a{padding:5px 10px;border-radius:6px;background:var(--bg-soft);color:var(--ink-500);font-size:.82rem;font-weight:700}
.mobile-nav .lang-switch a.current{background:var(--blue-50);color:var(--blue-600)}

/* Hero / tool card */
.hero{padding:36px 0 8px}
.eyebrow{display:inline-block;font-size:.78rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:var(--blue-600);background:var(--blue-50);padding:4px 10px;border-radius:999px;margin-bottom:14px}
.lede{color:var(--ink-500);font-size:1.05rem;max-width:62ch}

.tool-card{background:var(--bg-soft);border:1px solid var(--line);border-radius:var(--radius);padding:22px;margin:22px 0 30px;box-shadow:var(--shadow)}
.tool-grid{display:grid;gap:14px;grid-template-columns:1fr}
@media (min-width:640px){.tool-grid.cols-2{grid-template-columns:1fr 1fr}
  .tool-grid.cols-3{grid-template-columns:1fr 1fr 1fr}}

.field{display:flex;flex-direction:column;gap:6px}
.field label{font-weight:700;font-size:.88rem;color:var(--ink-700)}
.field input,.field select{
  font-size:1rem;padding:11px 12px;border-radius:var(--radius-sm);border:1.5px solid var(--line);
  background:#fff;color:var(--ink-900);width:100%;font-family:inherit;
}
.field input:focus,.field select:focus{outline:none;border-color:var(--blue-600);box-shadow:0 0 0 3px var(--blue-50)}
.field small{color:var(--ink-500);font-size:.8rem}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  background:var(--blue-600);color:#fff;font-weight:700;font-size:1rem;
  padding:13px 22px;border-radius:10px;border:none;cursor:pointer;width:100%;
  transition:background .15s ease, transform .05s ease;
}
.btn:hover{background:var(--blue-700);text-decoration:none;color:#fff}
.btn:active{transform:translateY(1px)}
.btn-secondary{background:#fff;color:var(--blue-600);border:1.5px solid var(--blue-600)}
.btn-secondary:hover{background:var(--blue-50);color:var(--blue-600)}
.btn-row{display:flex;gap:10px;flex-wrap:wrap}
.btn-row .btn{width:auto;flex:1 1 160px}

.results{margin-top:18px;display:none}
.results.show{display:block;animation:fadein .25s ease}
@keyframes fadein{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}

.result-hero{
  background:linear-gradient(135deg,var(--blue-600),#5b7dff);color:#fff;border-radius:var(--radius);
  padding:22px;text-align:center;margin-bottom:14px;
}
.result-hero .big-num{font-size:clamp(2.2rem,7vw,3.2rem);font-weight:800;line-height:1}
.result-hero .big-label{opacity:.9;font-weight:600;margin-top:4px}

.stat-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
@media (min-width:640px){.stat-grid{grid-template-columns:repeat(4,1fr)}}
.stat{background:#fff;border:1px solid var(--line);border-radius:var(--radius-sm);padding:14px;text-align:center}
.stat .num{font-size:1.5rem;font-weight:800;color:var(--blue-600)}
.stat .lbl{font-size:.78rem;color:var(--ink-500);font-weight:600;margin-top:2px}

.error-msg{color:#b3261e;font-weight:600;font-size:.9rem;margin-top:8px;display:none}
.error-msg.show{display:block}

/* Share row - shown under a result once it's computed */
.share-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px;padding-top:16px;border-top:1px solid var(--line)}
.share-row[hidden]{display:none}
.share-label-lead{width:100%;font-size:.8rem;font-weight:700;color:var(--ink-500);margin-bottom:2px}
.share-btn{
  display:inline-flex;align-items:center;gap:6px;padding:9px 14px;border-radius:8px;
  border:1.5px solid var(--line);background:#fff;font-weight:700;font-size:.85rem;
  color:var(--ink-700);cursor:pointer;font-family:inherit;
}
.share-btn:hover{border-color:var(--blue-600);color:var(--blue-600)}
.share-btn svg{width:16px;height:16px;flex:none}
.share-btn.wa:hover{border-color:#25D366;color:#1a9c4c}
.share-btn.fb:hover{border-color:#1877F2;color:#1877F2}
.share-btn.x:hover{border-color:var(--ink-900);color:var(--ink-900)}

/* Related tools strip */
.related-tools{display:grid;gap:12px;grid-template-columns:1fr}
@media (min-width:640px){.related-tools{grid-template-columns:1fr 1fr}}
@media (min-width:960px){.related-tools{grid-template-columns:1fr 1fr 1fr}}
.tool-link{
  display:block;border:1px solid var(--line);border-radius:var(--radius-sm);padding:16px;background:#fff;
  transition:border-color .15s ease, box-shadow .15s ease;
}
.tool-link:hover{border-color:var(--blue-600);box-shadow:var(--shadow);text-decoration:none}
.tool-link strong{display:block;color:var(--ink-900);font-size:.98rem;margin-bottom:4px}
.tool-link span{color:var(--ink-500);font-size:.85rem}

/* Content sections */
.content-block{max-width:74ch}
.content-block h2:first-child{margin-top:0}

.faq-item{border-bottom:1px solid var(--line);padding:16px 0}
.faq-item:last-child{border-bottom:none}
.faq-item h3{margin:0 0 6px}

table.data-table{width:100%;border-collapse:collapse;margin:1em 0;font-size:.92rem}
table.data-table th,table.data-table td{text-align:left;padding:9px 10px;border-bottom:1px solid var(--line)}
table.data-table th{font-weight:700;color:var(--ink-700);background:var(--bg-soft)}

.callout{background:var(--blue-50);border-left:4px solid var(--blue-600);border-radius:0 8px 8px 0;padding:14px 16px;margin:1.2em 0}
.callout.warn{background:#fff6e6;border-color:var(--amber-600)}

/* Year grid for born-in hub */
.year-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
@media (min-width:520px){.year-grid{grid-template-columns:repeat(5,1fr)}}
@media (min-width:768px){.year-grid{grid-template-columns:repeat(8,1fr)}}
.year-chip{display:block;text-align:center;padding:10px 4px;border:1px solid var(--line);border-radius:8px;background:#fff;font-weight:700;color:var(--ink-900);font-size:.92rem}
.year-chip:hover{border-color:var(--blue-600);color:var(--blue-600);text-decoration:none}

.year-nav{display:flex;justify-content:space-between;gap:10px;margin:22px 0;flex-wrap:wrap}
.year-nav a{font-weight:700}

/* Breadcrumb */
.breadcrumb{font-size:.85rem;color:var(--ink-500);margin:14px 0}
.breadcrumb a{color:var(--ink-500)}
.breadcrumb a:hover{color:var(--blue-600)}

/* Footer */
.site-footer{margin-top:60px;border-top:1px solid var(--line);background:var(--bg-soft);padding:40px 0 24px}
.footer-grid{display:grid;gap:26px;grid-template-columns:1fr}
@media (min-width:720px){.footer-grid{grid-template-columns:2fr 1fr 1fr 1fr}}
.footer-grid h4{font-size:.85rem;text-transform:uppercase;letter-spacing:.04em;color:var(--ink-700);margin-bottom:10px}
.footer-grid ul{list-style:none;padding:0;margin:0}
.footer-grid li{margin-bottom:8px}
.footer-grid a{color:var(--ink-500);font-size:.92rem}
.footer-grid a:hover{color:var(--blue-600)}
.footer-bottom{margin-top:30px;padding-top:20px;border-top:1px solid var(--line);display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between;color:var(--ink-500);font-size:.85rem}
.footer-brand-note{color:var(--ink-500);font-size:.9rem;max-width:40ch}

.section{padding:10px 0}
.section-tight{padding:6px 0}

main{display:block}
.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}