/* caterpillar.fit — green, calm, mobile-first */
:root{
  --green:#16a34a; --green-dark:#15803d; --green-deep:#0f3d22;
  --leaf:#bbf7d0; --mint:#f0fdf4;
  --bg:#f6f8f4; --card:#ffffff;
  --ink:#1f2937; --muted:#5b6472; --line:#e3e8df;
  --red:#b91c1c; --amber:#b45309; --blue:#1d4ed8;
  --radius:16px;
  --shadow:0 1px 2px rgba(16,24,40,.05), 0 10px 28px -14px rgba(22,163,74,.25);
}
*{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 Neue",Arial,sans-serif;color:var(--ink);background:var(--bg);line-height:1.65;font-size:16px}
.wrap{max-width:880px;margin:0 auto;padding:0 20px}
a{color:var(--green-dark)}
h1{font-size:1.9rem;line-height:1.25;margin:.2em 0 .4em;letter-spacing:-.02em}
h2{font-size:1.3rem;margin:2.2em 0 .6em;letter-spacing:-.01em}
h3{font-size:1.05rem;margin:1.4em 0 .4em}
p{margin:.6em 0}
.lead{font-size:1.08rem;color:var(--muted);max-width:44em}
section{margin:1.6em 0}

/* header */
.site-header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:58px}
.logo{display:flex;align-items:center;gap:8px;font-weight:800;font-size:1.12rem;color:var(--ink);text-decoration:none;letter-spacing:-.02em}
.logo svg{display:block}
.logo .tld{color:var(--green)}
.site-header nav{display:flex;gap:18px}
.site-header nav a{color:var(--muted);text-decoration:none;font-weight:600;font-size:.95rem}
.site-header nav a:hover{color:var(--green-dark)}

/* hero (home) */
.hero{background:linear-gradient(180deg,#eef7ec 0%,var(--bg) 100%);padding:56px 0 30px;text-align:center;border-bottom:1px solid var(--line)}
.hero h1{font-size:2.3rem;max-width:17ch;margin:0 auto .5em}
.hero .lead{margin:0 auto 1.4em}
.hero .metaphor{display:flex;justify-content:center;gap:10px;flex-wrap:wrap;margin-top:26px;padding:0}
.metaphor span{background:var(--card);border:1px solid var(--line);border-radius:999px;padding:7px 16px;font-size:.92rem;font-weight:600;color:var(--muted);box-shadow:var(--shadow)}
.metaphor b{color:var(--green-dark)}

/* tool cards */
.tools-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:14px;margin:1.2em 0}
.tool-card{display:block;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px;text-decoration:none;color:var(--ink);box-shadow:var(--shadow);transition:transform .12s ease,border-color .12s ease}
.tool-card:hover{transform:translateY(-2px);border-color:var(--green)}
.tool-card .ico{display:inline-flex;align-items:center;justify-content:center;width:42px;height:42px;border-radius:12px;background:var(--mint);font-size:1.3rem;margin-bottom:10px}
.tool-card b{display:block;font-size:1.02rem;margin-bottom:3px}
.tool-card span{font-size:.88rem;color:var(--muted);line-height:1.45;display:block}

/* calculator card */
.calc-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px;margin:1.4em 0}
.field{margin:14px 0}
.field>label,.field .lbl{display:block;font-weight:600;font-size:.92rem;margin-bottom:6px}
.row{display:flex;gap:12px;flex-wrap:wrap}
.row .field{flex:1;min-width:130px}
input[type=number],select{width:100%;padding:11px 12px;border:1.5px solid var(--line);border-radius:10px;font-size:1rem;background:#fff;color:var(--ink);font-family:inherit}
input[type=number]:focus,select:focus{outline:none;border-color:var(--green);box-shadow:0 0 0 3px rgba(22,163,74,.15)}
.pills{display:flex;gap:8px;flex-wrap:wrap}
.pills label{cursor:pointer}
.pills input{position:absolute;opacity:0;pointer-events:none}
.pills .pill{display:inline-block;padding:8px 16px;border:1.5px solid var(--line);border-radius:999px;font-size:.92rem;font-weight:600;color:var(--muted);background:#fff;transition:all .1s}
.pills input:checked+.pill{background:var(--green-dark);border-color:var(--green-dark);color:#fff}
.hint{font-size:.83rem;color:var(--muted);margin-top:5px}
.btn{display:block;width:100%;margin-top:18px;padding:14px;border:none;border-radius:12px;background:var(--green-dark);color:#fff;font-size:1.05rem;font-weight:700;cursor:pointer;font-family:inherit}
.btn:hover{background:var(--green)}
.error{display:none;background:#fef2f2;border:1px solid #fecaca;color:var(--red);border-radius:10px;padding:10px 14px;margin-top:14px;font-size:.92rem}

/* unit visibility */
.calc-form:not(.unit-imperial) .only-imperial{display:none}
.calc-form.unit-imperial .only-metric{display:none}
.calc-form.unit-imperial .h-pair{display:flex}
/* sex-dependent fields (body-fat hip for women) */
.calc-form:not(.sex-female) .only-female{display:none}
.calc-form.sex-female .only-female{display:block}
/* preset distance chips (pace) */
.chips{display:flex;gap:8px;flex-wrap:wrap;margin:2px 0 4px}
.chip{border:1.5px solid var(--line);background:#fff;color:var(--muted);border-radius:999px;padding:6px 14px;font-size:.86rem;font-weight:600;cursor:pointer;font-family:inherit}
.chip:hover{border-color:var(--green);color:var(--green-dark)}

/* results */
.result{display:none;margin-top:20px;border-top:1px dashed var(--line);padding-top:18px}
.result.show{display:block}
.result-main{display:flex;align-items:center;gap:16px;flex-wrap:wrap}
.result-big{font-size:2.6rem;font-weight:800;letter-spacing:-.03em;color:var(--green-deep);line-height:1}
.result-big small{font-size:1.05rem;font-weight:600;color:var(--muted);letter-spacing:0}
.badge{display:inline-block;padding:5px 13px;border-radius:999px;font-size:.85rem;font-weight:700}
.badge.ok{background:#dcfce7;color:#166534}
.badge.warn{background:#fef3c7;color:#92400e}
.badge.bad{background:#fee2e2;color:#991b1b}
.badge.info{background:#dbeafe;color:#1e40af}
.result-rows{margin-top:14px}
.rrow{display:flex;justify-content:space-between;gap:12px;padding:9px 0;border-bottom:1px solid var(--line);font-size:.98rem}
.rrow:last-child{border-bottom:none}
.rrow .k{color:var(--muted)}
.rrow .v{font-weight:700;text-align:right}

/* tables */
.tbl-wrap{overflow-x:auto;margin:1em 0}
table{border-collapse:collapse;width:100%;font-size:.94rem;background:var(--card)}
th,td{border:1px solid var(--line);padding:9px 12px;text-align:left}
th{background:var(--mint);font-weight:700}
tbody tr:nth-child(even){background:#fafcf8}

/* formula box */
.formula{background:var(--mint);border:1px solid #d3ead7;border-radius:12px;padding:14px 18px;font-size:1rem;margin:1em 0;overflow-x:auto}
.formula code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.95rem;color:var(--green-deep)}

/* steps + prose */
ol.steps{padding-left:1.3em}
ol.steps li{margin:.45em 0}
.note{background:#fffbeb;border:1px solid #fde68a;border-radius:12px;padding:12px 16px;font-size:.92rem;color:#78350f;margin:1em 0}

/* faq */
.faq details{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:14px 18px;margin:10px 0;box-shadow:var(--shadow)}
.faq summary{font-weight:700;cursor:pointer;font-size:.98rem}
.faq details p{color:var(--muted);font-size:.95rem;margin:.6em 0 0}

/* related */
.related-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:12px;margin:1em 0}

/* footer */
.site-footer{background:var(--green-deep);color:#d9f2e0;margin-top:60px;padding:38px 0 30px;font-size:.92rem}
.site-footer a{color:#eafff0;text-decoration:none}
.site-footer a:hover{text-decoration:underline}
.footer-brand{font-weight:700;font-size:1.05rem;margin-bottom:14px}
.footer-links{list-style:none;padding:0;margin:0 0 16px;display:flex;flex-wrap:wrap;gap:6px 18px}
.footer-links a{opacity:.92}
.footer-note{opacity:.75;margin:.4em 0;font-size:.85rem}
.site-footer .wrap p{margin:.3em 0}

.noscript{background:#fef3c7;border-radius:10px;padding:10px 14px;font-size:.9rem;margin:0 0 10px}

@media (max-width:560px){
  h1{font-size:1.55rem}
  .hero h1{font-size:1.7rem}
  .result-big{font-size:2.1rem}
  .header-inner{height:52px}
  .logo{font-size:1.02rem}
}