/* ==========================================================================
   EquineWeight — design system
   Light, editorial, mobile-first. Built for AdSense-friendly "looks legit" pages.
   ========================================================================== */

:root{
  --bg:#f6f6f3;
  --card:#ffffff;
  --ink:#1b1f23;
  --ink-2:#4a5560;
  --ink-3:#7a8590;
  --line:#e3e5e2;
  --line-strong:#cdd2cd;
  --brand:#1d5c46;
  --brand-dark:#123c2d;
  --brand-soft:#e8f2ed;
  --accent:#9a5410;
  --accent-soft:#fdf3e7;
  --ok:#166534;
  --ok-soft:#eaf7ee;
  --warn:#9a3412;
  --warn-soft:#fdf1ec;
  --radius:14px;
  --radius-sm:9px;
  --shadow:0 1px 2px rgba(16,24,40,.05), 0 6px 18px -8px rgba(16,24,40,.12);
  --maxw:1120px;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans",sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:84px}
body{
  margin:0;background:var(--bg);color:var(--ink);font-family:var(--font);
  font-size:17px;line-height:1.7;
}
img{max-width:100%;height:auto;display:block}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3,h4{line-height:1.28;margin:0 0 .5em;font-weight:700;letter-spacing:-.01em}
h1{font-size:2rem}
h2{font-size:1.4rem;margin-top:2em}
h3{font-size:1.12rem;margin-top:1.6em}
p{margin:0 0 1em}
ul,ol{margin:0 0 1em;padding-left:1.35em}
li{margin:.35em 0}
hr{border:0;border-top:1px solid var(--line);margin:2rem 0}
small{font-size:.85rem}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px}
.skip{position:absolute;left:-9999px}
.skip:focus{left:12px;top:12px;background:#fff;padding:10px 14px;border-radius:8px;z-index:99;box-shadow:var(--shadow)}

/* visible keyboard focus everywhere (matches input focus style) */
a:focus-visible,button:focus-visible,summary:focus-visible,[tabindex]:focus-visible{
  outline:2px solid var(--brand);outline-offset:2px;border-radius:4px;
}
.btn:focus-visible{outline:2px solid var(--brand-dark);outline-offset:2px}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important}
}

/* ---------- header ---------- */
.site-header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:40}
.hdr{display:flex;align-items:center;gap:16px;min-height:64px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.12rem;color:var(--ink)}
.brand:hover{text-decoration:none}
.brand svg{width:30px;height:30px;flex:none}
.brand .bt{display:flex;flex-direction:column;line-height:1.15}
.brand .bt em{font-style:normal;font-weight:500;font-size:.7rem;color:var(--ink-3);letter-spacing:.02em}
.nav{margin-left:auto;display:flex;align-items:center;gap:4px;flex-wrap:wrap}
.nav a{
  color:var(--ink-2);font-size:.9rem;font-weight:600;padding:8px 10px;border-radius:8px;
}
.nav a:hover{background:var(--brand-soft);color:var(--brand-dark);text-decoration:none}
.nav a.cta{background:var(--brand);color:#fff}
.nav a.cta:hover{background:var(--brand-dark);color:#fff}
.menu-btn{display:none;margin-left:auto;background:#fff;border:1px solid var(--line-strong);border-radius:9px;padding:8px 10px;cursor:pointer}
.menu-btn span{display:block;width:18px;height:2px;background:var(--ink);margin:3px 0;border-radius:2px}
@media (max-width:880px){
  .nav{display:none;position:absolute;left:0;right:0;top:100%;background:#fff;border-bottom:1px solid var(--line);
       flex-direction:column;align-items:stretch;padding:10px 16px 18px;gap:2px;box-shadow:var(--shadow)}
  .nav.open{display:flex}
  .nav a{padding:11px 8px;font-size:.95rem}
  .menu-btn{display:block}
}

/* ---------- breadcrumb ---------- */
.crumbs{font-size:.82rem;color:var(--ink-3);padding:14px 0 0}
.crumbs ol{list-style:none;display:flex;flex-wrap:wrap;gap:6px;margin:0;padding:0}
.crumbs li:not(:last-child)::after{content:"/";margin-left:6px;color:var(--line-strong)}

/* ---------- hero ---------- */
.hero{background:linear-gradient(180deg,#fff 0%,#f2f5f1 100%);border-bottom:1px solid var(--line);padding:34px 0 30px}
.hero h1{margin-bottom:.35em}
.hero .lede{font-size:1.06rem;color:var(--ink-2);max-width:62ch;margin-bottom:0}
.hero .meta-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px}
.chip{font-size:.76rem;font-weight:600;letter-spacing:.01em;padding:5px 11px;border-radius:999px;background:var(--brand-soft);color:var(--brand-dark);border:1px solid #d3e5dc}
.chip.alt{background:var(--accent-soft);color:var(--accent);border-color:#f0dcc3}

/* ---------- layout ---------- */
.layout{display:grid;grid-template-columns:minmax(0,1fr);gap:34px;padding:30px 0 60px}
@media (min-width:1000px){
  .layout.has-rail{grid-template-columns:minmax(0,1fr) 300px}
}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
.pad{padding:26px}
@media (max-width:620px){.pad{padding:18px}}

/* ---------- tool ---------- */
.tool{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}
.tool-head{padding:16px 22px;border-bottom:1px solid var(--line);background:#fbfcfb;display:flex;align-items:center;gap:10px}
.tool-head h2{margin:0;font-size:1rem;letter-spacing:.02em;text-transform:uppercase;color:var(--ink-2)}
.tool-head .dot{width:8px;height:8px;border-radius:50%;background:var(--brand);flex:none}
.tool-body{padding:22px}
@media (max-width:620px){.tool-body{padding:16px}}
.field-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:16px}
.field{display:flex;flex-direction:column;gap:6px;min-width:0}
.field label{font-size:.86rem;font-weight:700;color:var(--ink)}
.field .hint{font-size:.76rem;color:var(--ink-3);line-height:1.45}
.field .unit{font-size:.76rem;color:var(--ink-3);font-weight:600}
.field-label{font-size:.86rem;font-weight:700;color:var(--ink);display:block}
input[type=number],input[type=text],input[type=date],select,textarea{
  width:100%;padding:11px 12px;border:1px solid var(--line-strong);border-radius:var(--radius-sm);
  font:inherit;font-size:1rem;background:#fff;color:var(--ink);
}
input:focus,select:focus,textarea:focus{outline:2px solid #b9d6c9;outline-offset:1px;border-color:var(--brand)}
.seg{display:flex;flex-wrap:wrap;gap:6px}
.seg label{
  display:inline-flex;align-items:center;gap:7px;font-size:.86rem;font-weight:600;color:var(--ink-2);
  border:1px solid var(--line-strong);border-radius:999px;padding:7px 13px;cursor:pointer;background:#fff;
}
.seg label:hover{border-color:var(--brand)}
.seg input{accent-color:var(--brand);margin:0}
.seg label:has(input:checked){background:var(--brand-soft);border-color:var(--brand);color:var(--brand-dark)}
.btn{
  appearance:none;border:0;border-radius:var(--radius-sm);background:var(--brand);color:#fff;
  font:inherit;font-weight:700;padding:12px 20px;cursor:pointer;
}
.btn:hover{background:var(--brand-dark)}
.btn.ghost{background:#fff;color:var(--brand-dark);border:1px solid var(--line-strong)}
.btn.ghost:hover{background:var(--brand-soft)}
.tool-actions{margin-top:18px;display:flex;flex-wrap:wrap;gap:10px;align-items:center}

/* results */
.result{margin-top:20px;border:1px solid #cfe6da;background:var(--ok-soft);border-radius:var(--radius-sm);padding:18px}
.result.empty{background:#fafbfa;border-color:var(--line);color:var(--ink-3)}
.result h3{margin:0 0 10px;font-size:.8rem;letter-spacing:.1em;text-transform:uppercase;color:var(--ok)}
.result .big{font-size:2.15rem;font-weight:800;color:var(--brand-dark);line-height:1.1;letter-spacing:-.02em}
.result .big small{font-size:1rem;font-weight:600;color:var(--ink-2)}
.kv{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:12px;margin-top:14px}
.kv div{background:#fff;border:1px solid var(--line);border-radius:var(--radius-sm);padding:11px 13px}
.kv dt{font-size:.74rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--ink-3);margin:0}
.kv dd{margin:3px 0 0;font-weight:700;font-size:1.02rem;color:var(--ink)}
.err{color:var(--warn);background:var(--warn-soft);border:1px solid #f2d6c6;border-radius:var(--radius-sm);padding:11px 14px;margin-top:14px;font-size:.92rem}
.note{font-size:.84rem;color:var(--ink-3);margin-top:12px}

/* ---------- ads ---------- */
.ad-slot{margin:26px 0;text-align:center}
.ad-slot .ad-label{font-size:.66rem;letter-spacing:.16em;text-transform:uppercase;color:#9aa2a8;margin-bottom:6px}
.ad-ph{
  border:1px dashed var(--line-strong);background:
    repeating-linear-gradient(45deg,#fbfbfa,#fbfbfa 10px,#f5f5f3 10px,#f5f5f3 20px);
  border-radius:var(--radius-sm);color:#8c949a;font-size:.82rem;
  display:flex;align-items:center;justify-content:center;min-height:90px;padding:14px;
}
.ad-ph.tall{min-height:250px}
.rail{display:flex;flex-direction:column;gap:22px}
@media (max-width:999px){.rail{display:none}}
.rail .sticky{position:sticky;top:84px}

/* ---------- prose ---------- */
.prose h2{margin-top:1.9em}
.prose h3{margin-top:1.5em}
.prose .card{padding:0}
.formula{
  font-family:var(--mono);font-size:.95rem;background:#f4f6f4;border:1px solid var(--line);
  border-left:4px solid var(--brand);border-radius:0 var(--radius-sm) var(--radius-sm) 0;
  padding:14px 16px;margin:1.1em 0;overflow-x:auto;white-space:pre-wrap;line-height:1.6;
}
.callout{border-radius:var(--radius-sm);padding:15px 18px;margin:1.2em 0;font-size:.95rem}
.callout.tip{background:var(--brand-soft);border:1px solid #d3e5dc}
.callout.warn{background:var(--warn-soft);border:1px solid #f2d6c6}
.callout.info{background:var(--accent-soft);border:1px solid #f0dcc3}
.callout p:last-child{margin-bottom:0}
.callout strong{color:inherit}
blockquote{margin:1.3em 0;padding:2px 0 2px 18px;border-left:3px solid var(--line-strong);color:var(--ink-2)}
table{width:100%;border-collapse:collapse;margin:1.2em 0;font-size:.93rem}
th,td{border:1px solid var(--line);padding:9px 12px;text-align:left;vertical-align:top}
th{background:#f3f5f3;font-weight:700;white-space:nowrap}
tbody tr:nth-child(even) td{background:#fbfcfb}
.table-scroll{overflow-x:auto}
details{background:#fff;border:1px solid var(--line);border-radius:var(--radius-sm);padding:14px 18px;margin:10px 0}
details[open]{box-shadow:0 1px 2px rgba(16,24,40,.04)}
summary{cursor:pointer;font-weight:700;font-size:1rem}
details p:last-child{margin-bottom:0}
details p{margin-top:10px;color:var(--ink-2)}

/* link lists / hub */
.hub{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px;margin:1.2em 0 0;padding:0;list-style:none}
.hub li{margin:0}
.hub a{display:block;height:100%;background:#fff;border:1px solid var(--line);border-radius:var(--radius-sm);padding:15px 16px}
.hub a:hover{border-color:var(--brand);box-shadow:var(--shadow);text-decoration:none}
.hub b{display:block;color:var(--ink);font-size:1rem;margin-bottom:4px}
.hub span{display:block;color:var(--ink-3);font-size:.85rem;line-height:1.5}
.pill-row{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 1.2em;padding:0;list-style:none}
.pill-row a{font-size:.87rem;font-weight:600;background:#fff;border:1px solid var(--line);border-radius:999px;padding:7px 13px;color:var(--ink-2)}
.pill-row a:hover{border-color:var(--brand);color:var(--brand-dark);text-decoration:none}

/* sources */
.sources{font-size:.85rem;color:var(--ink-3)}
.sources li{margin:.5em 0}
.updated{font-size:.8rem;color:var(--ink-3);margin-top:18px;padding-top:14px;border-top:1px dashed var(--line)}

/* footer */
.site-footer{background:#14332a;color:#c8d8d1;margin-top:40px;padding:44px 0 30px;font-size:.9rem}
.site-footer h2,.site-footer h3{color:#fff;font-size:.85rem;letter-spacing:.1em;text-transform:uppercase;margin:0 0 12px}
.foot-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:26px}
.site-footer ul{list-style:none;margin:0;padding:0}
.site-footer li{margin:.4em 0}
.site-footer a{color:#c8d8d1}
.site-footer a:hover{color:#fff}
.foot-bottom{border-top:1px solid rgba(255,255,255,.14);margin-top:30px;padding-top:20px;display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;font-size:.82rem;color:#93a8a0}

/* misc */
.center{text-align:center}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
.bcs-row{display:grid;grid-template-columns:56px 1fr;gap:12px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:var(--radius-sm);padding:11px 14px;margin:8px 0}
.bcs-row .sc{font-weight:800;color:var(--brand);font-size:1.05rem}
.bcs-row .lbl b{display:block;font-size:.96rem}
.bcs-row .lbl span{font-size:.84rem;color:var(--ink-3)}
@media print{.site-header,.nav,.ad-slot,.rail,.site-footer,.menu-btn{display:none!important}}