/* ============================================================
   Zyrone.tech — Chronological Age Tools
   Design system: clinical precision. Ink slate + paper +
   assessment-teal. Display: Bricolage Grotesque. Body: Public
   Sans. Data: IBM Plex Mono (clinician notation is the
   signature element).
   ============================================================ */

:root{
  --ink:#16262e;
  --ink-soft:#3d5561;
  --paper:#f7f9f9;
  --card:#ffffff;
  --teal:#0e7c66;
  --teal-deep:#0a5c4c;
  --tint:#e7f2ef;
  --line:#dce5e4;
  --amber:#b26a1f;
  --amber-tint:#faf3e8;
  --radius:14px;
  --shadow:0 1px 2px rgba(22,38,46,.06),0 8px 24px rgba(22,38,46,.07);
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{animation:none!important;transition:none!important}}

body{
  font-family:'Public Sans',system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
  background:var(--paper);
  color:var(--ink);
  line-height:1.65;
  font-size:16.5px;
  -webkit-font-smoothing:antialiased;
}

h1,h2,h3{font-family:'Bricolage Grotesque','Public Sans',sans-serif;line-height:1.15;letter-spacing:-.01em}
h1{font-size:clamp(1.9rem,4.5vw,2.9rem);font-weight:800}
h2{font-size:clamp(1.35rem,3vw,1.75rem);font-weight:700;margin:2.4rem 0 .9rem}
h3{font-size:1.12rem;font-weight:700;margin:1.6rem 0 .5rem}
p{margin:.75rem 0}
a{color:var(--teal-deep)}
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid var(--teal);outline-offset:2px;border-radius:4px}

.wrap{max-width:960px;margin:0 auto;padding:0 20px}
.narrow{max-width:760px}

/* ---------- Header ---------- */
.site-head{background:var(--card);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50}
.site-head .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:64px}
.brand{display:flex;align-items:baseline;gap:8px;text-decoration:none;color:var(--ink);font-family:'Bricolage Grotesque',sans-serif;font-weight:800;font-size:1.25rem}
.brand .dot{color:var(--teal)}
.brand small{font-family:'IBM Plex Mono',monospace;font-weight:500;font-size:.66rem;color:var(--ink-soft);letter-spacing:.08em;text-transform:uppercase}
nav.main{display:flex;gap:4px;flex-wrap:wrap}
nav.main a{text-decoration:none;color:var(--ink-soft);font-size:.9rem;font-weight:600;padding:8px 12px;border-radius:8px}
nav.main a:hover{background:var(--tint);color:var(--teal-deep)}
nav.main a[aria-current="page"]{background:var(--ink);color:#fff}

/* ---------- Hero ---------- */
.hero{padding:56px 0 8px}
.eyebrow{font-family:'IBM Plex Mono',monospace;font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;color:var(--teal-deep);background:var(--tint);display:inline-block;padding:5px 12px;border-radius:999px;margin-bottom:14px}
.hero p.lede{color:var(--ink-soft);max-width:640px;margin-top:12px;font-size:1.05rem}

/* ---------- Calculator card ---------- */
.calc{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:28px;margin:28px 0}
.calc .grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}
@media (max-width:640px){.calc .grid{grid-template-columns:1fr}}
.field label{display:block;font-weight:700;font-size:.86rem;margin-bottom:6px}
.field .hint{font-weight:400;color:var(--ink-soft);font-size:.8rem;display:block;margin-top:2px}
.field input,.field select{width:100%;padding:12px 14px;border:1.5px solid var(--line);border-radius:10px;font:inherit;font-size:1rem;background:#fff;color:var(--ink)}
.field input:focus,.field select:focus{border-color:var(--teal)}
.ga-row{display:flex;gap:10px}
.ga-row .field{flex:1}
.btn{display:inline-block;background:var(--teal);color:#fff;border:none;border-radius:10px;padding:14px 28px;font:inherit;font-weight:700;font-size:1rem;cursor:pointer;margin-top:18px;transition:background .15s}
.btn:hover{background:var(--teal-deep)}
.btn.ghost{background:transparent;color:var(--ink-soft);border:1.5px solid var(--line);margin-left:10px}
.btn.ghost:hover{background:var(--paper);color:var(--ink)}
.error{color:#a3352c;background:#fbeeec;border:1px solid #eccfcb;border-radius:10px;padding:10px 14px;margin-top:16px;font-size:.92rem;display:none}

/* ---------- Result: the report line (signature) ---------- */
.result{display:none;margin-top:26px;border-top:2px solid var(--ink);padding-top:22px}
.result.show{display:block;animation:rise .35s ease}
@keyframes rise{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.notation{font-family:'IBM Plex Mono',monospace;font-size:clamp(2.6rem,8vw,4.2rem);font-weight:600;color:var(--teal-deep);line-height:1;letter-spacing:-.02em}
.notation .sep{color:var(--ink);opacity:.35}
.notation-label{font-family:'IBM Plex Mono',monospace;font-size:.72rem;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-soft);margin-top:8px}
.readout{font-size:1.15rem;font-weight:700;margin-top:18px}
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;margin-top:18px}
.stat{background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:12px 14px}
.stat b{display:block;font-family:'IBM Plex Mono',monospace;font-size:1.15rem;color:var(--ink)}
.stat span{font-size:.78rem;color:var(--ink-soft);letter-spacing:.02em}
.note{background:var(--amber-tint);border:1px solid #ecd9bd;color:#6b4a17;border-radius:10px;padding:12px 16px;font-size:.9rem;margin-top:18px}

/* ---------- Content / article ---------- */
article.content{padding:8px 0 24px}
article.content ul,article.content ol{margin:.75rem 0 .75rem 1.4rem}
article.content li{margin:.35rem 0}
.steps{counter-reset:s;list-style:none;margin-left:0!important}
.steps li{counter-increment:s;position:relative;padding-left:44px;margin:.9rem 0!important}
.steps li::before{content:counter(s);position:absolute;left:0;top:2px;width:28px;height:28px;border-radius:50%;background:var(--ink);color:#fff;font-family:'IBM Plex Mono',monospace;font-size:.85rem;display:flex;align-items:center;justify-content:center}
table{width:100%;border-collapse:collapse;margin:1rem 0;background:var(--card);border:1px solid var(--line);border-radius:10px;overflow:hidden;font-size:.94rem}
th,td{padding:10px 14px;text-align:left;border-bottom:1px solid var(--line)}
th{background:var(--tint);font-size:.82rem;letter-spacing:.04em;text-transform:uppercase}
tr:last-child td{border-bottom:none}

/* ---------- FAQ ---------- */
details{background:var(--card);border:1px solid var(--line);border-radius:10px;margin:10px 0;padding:0}
summary{cursor:pointer;font-weight:700;padding:16px 18px;list-style:none;display:flex;justify-content:space-between;gap:12px}
summary::after{content:"+";font-family:'IBM Plex Mono',monospace;color:var(--teal);font-size:1.2rem;flex-shrink:0}
details[open] summary::after{content:"–"}
details .a{padding:0 18px 16px;color:var(--ink-soft)}

/* ---------- Tool cross-links ---------- */
.tools-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px;margin:1.2rem 0}
.tool-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px;text-decoration:none;color:var(--ink);display:block;transition:border-color .15s,transform .15s}
.tool-card:hover{border-color:var(--teal);transform:translateY(-2px)}
.tool-card b{font-family:'Bricolage Grotesque',sans-serif;font-size:1.05rem}
.tool-card span{display:block;color:var(--ink-soft);font-size:.88rem;margin-top:6px}
.tool-card .go{color:var(--teal-deep);font-weight:700;font-size:.85rem;margin-top:10px;display:inline-block}

/* ---------- Footer ---------- */
.site-foot{background:var(--ink);color:#cfdce1;margin-top:64px;padding:44px 0 28px;font-size:.9rem}
.site-foot .cols{display:grid;grid-template-columns:2fr 1fr 1fr;gap:32px}
@media (max-width:640px){.site-foot .cols{grid-template-columns:1fr}}
.site-foot h4{font-family:'Bricolage Grotesque',sans-serif;color:#fff;font-size:1rem;margin-bottom:10px}
.site-foot a{color:#9fc3b8;text-decoration:none;display:block;padding:3px 0}
.site-foot a:hover{color:#fff}
.site-foot .legal{border-top:1px solid rgba(255,255,255,.14);margin-top:32px;padding-top:18px;font-size:.8rem;color:#8aa0a9;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}

/* ---------- Utility pages ---------- */
.page-pad{padding:48px 0}