/* ─────────────────────────────────────────────────────────────
   Tools site — shared design system.
   Own identity, deliberately separable from the MashxLabz academy
   brand (this site migrates to its own domain later).
   Light/dark via prefers-color-scheme; tokens only, no hardcoded
   colors below the token block.
   ───────────────────────────────────────────────────────────── */
:root{
  --bg:#F7F8F6; --surface:#FFFFFF; --panel:#EEF2EE; --ink:#171A1C; --muted:#5C6660;
  --line:#E2E5E0; --accent:#0E7C66; --accent-ink:#0A5C4C; --accent-soft:#DCEBE6;
  --warn:#8A5A18; --radius:14px;
}
@media (prefers-color-scheme: dark){
  :root{
    --bg:#121514; --surface:#1A1E1C; --panel:#202623; --ink:#ECEFEA; --muted:#9AA49E;
    --line:#2B322E; --accent:#34B39A; --accent-ink:#5ECDB6; --accent-soft:#1E3630;
    --warn:#D3A45E;
  }
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:'Manrope',system-ui,sans-serif;line-height:1.6;-webkit-font-smoothing:antialiased}
.mono{font-family:'JetBrains Mono',ui-monospace,monospace}
a{color:var(--accent-ink)}
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
@media (prefers-reduced-motion: reduce){*{animation:none!important;transition:none!important}}

/* header / footer */
.site-head{display:flex;align-items:center;justify-content:space-between;gap:16px;max-width:960px;margin:0 auto;padding:18px 20px}
.wordmark{font-weight:800;font-size:18px;letter-spacing:-.01em;color:var(--ink);text-decoration:none}
.wordmark b{color:var(--accent)}
.site-head nav a{font-size:14px;color:var(--muted);text-decoration:none;margin-left:16px}
.site-head nav a:hover{color:var(--ink)}
.site-foot{max-width:960px;margin:64px auto 0;padding:24px 20px 48px;border-top:1px solid var(--line);font-size:13.5px;color:var(--muted)}
.site-foot .cols{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:18px}
.site-foot h4{font-size:12px;text-transform:uppercase;letter-spacing:.1em;margin:0 0 8px;color:var(--muted)}
.site-foot ul{list-style:none;margin:0;padding:0}
.site-foot li{margin:5px 0}
.site-foot a{color:var(--muted)}
.site-foot a:hover{color:var(--ink)}
.credit{margin-top:22px;font-size:12.5px}

/* page scaffold */
main{max-width:960px;margin:0 auto;padding:8px 20px 40px}
h1{font-size:clamp(26px,4.5vw,38px);line-height:1.15;letter-spacing:-.015em;margin:18px 0 6px;text-wrap:balance;font-weight:800}
.sub{color:var(--muted);max-width:64ch;margin:0 0 24px;font-size:16.5px}
h2{font-size:clamp(20px,3vw,26px);margin:44px 0 10px;letter-spacing:-.01em;font-weight:800}
h3{font-size:17px;margin:26px 0 8px;font-weight:700}
p{max-width:70ch}
.content p,.content li{color:var(--ink)}
.content .note{color:var(--muted);font-size:14px}

/* the calculator panel */
.calc{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:0;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:0 1px 2px rgba(0,0,0,.04)}
.calc-in{padding:24px}
.calc-out{padding:24px;background:var(--panel);display:flex;flex-direction:column;gap:14px}
@media (max-width:720px){.calc{grid-template-columns:1fr}}
.field{margin-bottom:14px}
.field label{display:block;font-size:13px;font-weight:700;margin-bottom:5px}
.field .hint{font-weight:400;color:var(--muted)}
.field input,.field select{width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:8px;background:var(--bg);color:var(--ink);font:inherit;font-variant-numeric:tabular-nums}
.field-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
@media (max-width:460px){.field-row{grid-template-columns:1fr}}
.seg{display:flex;border:1px solid var(--line);border-radius:8px;overflow:hidden}
.seg button{flex:1;padding:9px 6px;border:0;background:var(--bg);color:var(--muted);font:inherit;font-size:13.5px;font-weight:700;cursor:pointer}
.seg button[aria-pressed="true"]{background:var(--accent);color:#fff}

/* results */
.result-big{font-family:'JetBrains Mono',ui-monospace,monospace;font-size:clamp(26px,4vw,36px);font-weight:700;letter-spacing:-.01em}
.result-big .lbl,.result .lbl{display:block;font-family:'Manrope',system-ui,sans-serif;font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.09em;color:var(--muted);margin-bottom:2px}
.result{font-family:'JetBrains Mono',ui-monospace,monospace;font-size:19px;font-weight:600}
.result-note{font-size:13px;color:var(--muted)}
.good{color:var(--accent-ink)}

/* content + FAQ + tables */
.content{margin-top:8px}
.formula{background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:14px 18px;font-family:'JetBrains Mono',ui-monospace,monospace;font-size:14.5px;overflow-x:auto;margin:14px 0}
details.faq{border:1px solid var(--line);border-radius:10px;background:var(--surface);margin:10px 0;padding:0 16px}
details.faq summary{cursor:pointer;font-weight:700;padding:13px 0;list-style-position:inside}
details.faq p{margin:0 0 14px}
.tbl-wrap{overflow-x:auto;margin:14px 0}
table{border-collapse:collapse;width:100%;min-width:480px;font-size:14.5px;background:var(--surface)}
th{font-size:12px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);text-align:left;padding:9px 12px;border-bottom:2px solid var(--line)}
td{padding:9px 12px;border-bottom:1px solid var(--line);font-variant-numeric:tabular-nums}
.verified{margin-top:34px;padding:12px 16px;border:1px solid var(--line);border-radius:10px;font-size:13.5px;color:var(--muted);background:var(--surface)}
.verified b{color:var(--ink)}

/* related tools strip */
.related{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px;margin-top:14px}
.related a{display:block;background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:14px 16px;text-decoration:none;color:var(--ink);font-weight:700;font-size:14.5px}
.related a span{display:block;font-weight:400;color:var(--muted);font-size:13px;margin-top:3px}
.related a:hover{border-color:var(--accent)}