/* =========================================================
   BMICalculatorsFemale.co.uk
   Clinical-instrument design system.
   Colour discipline: the page is ink + paper + one pine accent.
   The only saturated colour is the WHO band scale, because a BMI
   result IS a scale reading — that scale is the page's data colour.
   ========================================================= */

:root{
  /* --- neutrals: warm-black with a green bias, never pure grey --- */
  --ink:#14201b;
  --ink-2:#2b3931;
  --body:#415047;
  --muted:#6b7a71;
  --faint:#8b978f;

  --paper:#ffffff;
  --ground:#edf0eb;
  --ground-2:#e4e9e1;
  --rule:#d4dbd2;
  --rule-2:#bdc7ba;

  /* --- single accent --- */
  --accent:#1c5d46;
  --accent-2:#123f2f;
  --accent-soft:#dce9e1;
  --accent-ink:#0e3325;

  /* --- WHO band scale: diverging around "healthy".
         Cool arm = underweight; neutral sage midpoint = healthy;
         warm arm = overweight → obese III, ONE hue stepping light→dark.
         Validated (dataviz ordinal checks) in both modes.
         -on = text colour that clears contrast on that fill. --- */
  --b-under:#4993cd;  --b-under-on:#14201b;  --b-under-bg:#e1f1ff;
  --b-normal:#9eb0a1; --b-normal-on:#14201b; --b-normal-bg:#ebf3ec;
  --b-over:#f19b81;   --b-over-on:#14201b;   --b-over-bg:#ffe8e0;
  --b-ob1:#d97354;    --b-ob1-on:#14201b;    --b-ob1-bg:#ffdfd5;
  --b-ob2:#b94f2e;    --b-ob2-on:#ffffff;    --b-ob2-bg:#ffdbcf;
  --b-ob3:#903517;    --b-ob3-on:#ffffff;    --b-ob3-bg:#fee1d7;
  --shadow:0 1px 2px rgba(20,32,27,.05),0 8px 24px -12px rgba(20,32,27,.18);
  --shadow-lg:0 2px 4px rgba(20,32,27,.05),0 24px 48px -20px rgba(20,32,27,.28);

  /* --- "night" surfaces (footer, dark bands): stay dark in BOTH themes,
         so their text tokens never flip with --ink --- */
  --night:#15221c;
  --night-rule:#2e3d35;
  --on-night:#c9d3cc;
  --on-night-muted:#8c9a91;
  --on-night-faint:#6f7d74;
  --on-night-accent:#8ce0bd;

  --display:"Bricolage Grotesque","Helvetica Neue",Arial,sans-serif;
  --sans:"Public Sans",system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --gutter:clamp(1.1rem,3.5vw,2.6rem);
  --maxw:1240px;
}

@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --ink:#e9efe9;
    --ink-2:#cdd8ce;
    --body:#aebbb1;
    --muted:#8b9a90;
    --faint:#6f7d74;

    --paper:#141b17;
    --ground:#0c110e;
    --ground-2:#1a231d;
    --rule:#28332b;
    --rule-2:#3a4840;

    --accent:#5ccfa1;
    --accent-2:#8ce0bd;
    --accent-soft:#152e25;
    --accent-ink:#c9f0de;

    /* dark: warm arm flips so the most severe step is the brightest */
    --b-under:#5399d1;  --b-under-on:#14201b;  --b-under-bg:#152839;
    --b-normal:#57685a; --b-normal-on:#e9efe9; --b-normal-bg:#202621;
    --b-over:#89442f;   --b-over-on:#ffffff;   --b-over-bg:#351d16;
    --b-ob1:#b65b3f;    --b-ob1-on:#ffffff;    --b-ob1-bg:#391e16;
    --b-ob2:#de7858;    --b-ob2-on:#14201b;    --b-ob2-bg:#3e1f16;
    --b-ob3:#faa084;    --b-ob3-on:#14201b;    --b-ob3-bg:#391e16;
    --shadow:0 1px 2px rgba(0,0,0,.4),0 8px 24px -12px rgba(0,0,0,.6);
    --shadow-lg:0 2px 4px rgba(0,0,0,.4),0 24px 48px -20px rgba(0,0,0,.7);
    --night:#18261f;
    --night-rule:#2f3f36;
  }
}

/* Explicit dark choice wins over a light OS setting */
:root[data-theme="dark"]{
  --ink:#e9efe9;
  --ink-2:#cdd8ce;
  --body:#aebbb1;
  --muted:#8b9a90;
  --faint:#6f7d74;

  --paper:#141b17;
  --ground:#0c110e;
  --ground-2:#1a231d;
  --rule:#28332b;
  --rule-2:#3a4840;

  --accent:#5ccfa1;
  --accent-2:#8ce0bd;
  --accent-soft:#152e25;
  --accent-ink:#c9f0de;

  /* dark: warm arm flips so the most severe step is the brightest */
  --b-under:#5399d1;  --b-under-on:#14201b;  --b-under-bg:#152839;
  --b-normal:#57685a; --b-normal-on:#e9efe9; --b-normal-bg:#202621;
  --b-over:#89442f;   --b-over-on:#ffffff;   --b-over-bg:#351d16;
  --b-ob1:#b65b3f;    --b-ob1-on:#ffffff;    --b-ob1-bg:#391e16;
  --b-ob2:#de7858;    --b-ob2-on:#14201b;    --b-ob2-bg:#3e1f16;
  --b-ob3:#faa084;    --b-ob3-on:#14201b;    --b-ob3-bg:#391e16;
  --shadow:0 1px 2px rgba(0,0,0,.4),0 8px 24px -12px rgba(0,0,0,.6);
  --shadow-lg:0 2px 4px rgba(0,0,0,.4),0 24px 48px -20px rgba(0,0,0,.7);
  --night:#18261f;
  --night-rule:#2f3f36;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:76px}

body{
  margin:0;background:var(--ground);color:var(--body);
  font-family:var(--sans);font-size:16.5px;line-height:1.68;
  font-feature-settings:"kern" 1;-webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}

h1,h2,h3,h4{
  font-family:var(--display);color:var(--ink);margin:0;
  font-weight:700;line-height:1.08;letter-spacing:-.025em;text-wrap:balance;
}
h1{font-size:clamp(2.5rem,1.5rem + 4.2vw,4.6rem);font-weight:800;letter-spacing:-.035em}
h2{font-size:clamp(1.75rem,1.25rem + 2.1vw,2.7rem)}
h3{font-size:1.15rem;letter-spacing:-.015em}
h4{font-size:.95rem}
p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}

a{color:var(--accent);text-decoration:none;text-underline-offset:3px}
a:hover{text-decoration:underline}

::selection{background:var(--accent);color:var(--paper)}
:where(a,button,input,select,summary):focus-visible{
  outline:2px solid var(--accent);outline-offset:3px;border-radius:2px;
}

.skip-link{position:absolute;left:-9999px;top:0;z-index:200;background:var(--accent);color:#fff;padding:.7rem 1.1rem}
.skip-link:focus{left:0}

/* =========================================================
   Grid — 12 columns, content sits on different tracks by section
   ========================================================= */
.shell{width:min(var(--maxw),100% - (var(--gutter) * 2));margin-inline:auto}
.grid{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:0 clamp(1rem,2.4vw,2.2rem)}

/* Mono label that sits in the left rail — the page's structural device */
.rail{grid-column:1/3;position:relative}
.rail-label{
  font-family:var(--mono);font-size:.68rem;font-weight:500;letter-spacing:.14em;
  text-transform:uppercase;color:var(--faint);
  display:block;padding-top:.55rem;border-top:1px solid var(--rule-2);
}
.rail-label span{display:block;color:var(--accent);font-weight:600}

.col-main{grid-column:3/13}
.col-text{grid-column:3/10}
.col-wide{grid-column:1/13}
.col-right{grid-column:5/13}

.section{padding-block:clamp(2rem,1.5rem + 1.8vw,3.2rem);position:relative}
.section + .section{border-top:1px solid var(--rule)}

.band{background:var(--paper)}
.band-ink{background:var(--night);color:var(--on-night)}
.band-ink h2,.band-ink h3{color:#fff}
.band-ink .rail-label{color:var(--on-night-faint);border-color:var(--night-rule)}
.band-ink .rail-label span{color:var(--on-night-accent)}

.lede{font-size:clamp(1.02rem,.98rem + .3vw,1.18rem);color:var(--body);max-width:62ch}
.measure{max-width:66ch}
.measure > p + p{margin-top:1.05em}
.stack{display:flex;flex-direction:column}

/* =========================================================
   Header
   ========================================================= */
.site-header{
  position:sticky;top:0;z-index:100;background:var(--paper);
  border-bottom:1px solid var(--rule);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:1rem;min-height:64px}

.brand{display:inline-flex;align-items:center;gap:.62rem;color:var(--ink)}
.brand:hover{text-decoration:none}
.brand-mark{
  width:30px;height:30px;flex:none;display:grid;place-items:center;
  background:var(--accent);color:#fff;border-radius:3px;
}
.brand-mark svg{width:17px;height:17px}
.brand-text{font-family:var(--display);font-size:1.05rem;font-weight:700;letter-spacing:-.03em;color:var(--ink)}
.brand-text b{font-weight:700;color:var(--accent)}

.site-nav{display:flex;align-items:center;gap:1.5rem}
.site-nav a{
  font-family:var(--mono);font-size:.76rem;font-weight:500;letter-spacing:.04em;
  color:var(--muted);padding-block:.3rem;border-bottom:1.5px solid transparent;
}
.site-nav a:hover{color:var(--ink);text-decoration:none;border-bottom-color:var(--rule-2)}
.site-nav a.is-current{color:var(--ink);border-bottom-color:var(--accent)}
.site-nav .nav-cta{
  font-family:var(--sans);font-size:.85rem;font-weight:600;letter-spacing:0;
  background:var(--accent);color:#fff;padding:.5rem 1rem;border:0;border-radius:3px;
}
.site-nav .nav-cta:hover{background:var(--accent-2);color:#fff;border-bottom-color:transparent}

.nav-toggle{
  display:none;width:40px;height:40px;padding:0;border:1px solid var(--rule);
  background:var(--paper);border-radius:3px;cursor:pointer;place-items:center;gap:4px;
}
.nav-toggle span{display:block;width:17px;height:1.5px;background:var(--ink);transition:.2s}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(5.5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-5.5px) rotate(-45deg)}

/* =========================================================
   Buttons
   ========================================================= */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5rem;
  font-family:var(--sans);font-size:.95rem;font-weight:600;line-height:1;
  padding:.92rem 1.4rem;border:1px solid transparent;border-radius:3px;
  cursor:pointer;transition:background .15s ease,color .15s ease,border-color .15s ease;
}
.btn:hover{text-decoration:none}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:var(--accent-2);color:#fff}
.btn-quiet{background:transparent;color:var(--muted);border-color:var(--rule-2)}
.btn-quiet:hover{color:var(--ink);border-color:var(--ink);background:transparent}
.btn-invert{background:#fff;color:var(--ink)}
.btn-invert:hover{background:var(--on-night-accent);color:var(--night)}
.btn-block{width:100%}

/* =========================================================
   Hero — asymmetric: headline left, spec rail right,
   calculator breaks out of the text column beneath
   ========================================================= */
.hero{background:var(--paper);padding-block:clamp(1.8rem,1.3rem + 1.8vw,3rem) 0}
.hero-head{grid-column:1/9}
.hero-meta{grid-column:10/13;align-self:end;padding-bottom:.4rem}

.eyebrow{
  font-family:var(--mono);font-size:.72rem;font-weight:500;letter-spacing:.15em;
  text-transform:uppercase;color:var(--accent);
  display:inline-flex;align-items:center;gap:.55rem;margin-bottom:1.1rem;
}
.eyebrow::before{content:"";width:22px;height:1.5px;background:var(--accent)}

.hero h1{margin-bottom:1.1rem}
.hero h1 em{font-style:normal;color:var(--accent);letter-spacing:-.04em}

.hero-lede{grid-column:1/8;margin-top:1.4rem}
.hero-lede p{font-size:clamp(1.02rem,.98rem + .35vw,1.2rem);color:var(--body)}

/* Spec list, right rail — reads like an instrument's datasheet */
.spec{display:flex;flex-direction:column;gap:.55rem}
.spec div{display:flex;justify-content:space-between;gap:.9rem;padding-bottom:.5rem;border-bottom:1px solid var(--rule)}
.spec dt{font-family:var(--mono);font-size:.68rem;letter-spacing:.1em;text-transform:uppercase;color:var(--faint)}
.spec dd{margin:0;font-family:var(--mono);font-size:.8rem;font-weight:600;color:var(--ink);font-variant-numeric:tabular-nums}

/* =========================================================
   Calculator — the instrument. Two panes: input | readout
   ========================================================= */
.calc{
  grid-column:1/13;margin-top:clamp(1.8rem,1.2rem + 2vw,3rem);
  border:1px solid var(--rule-2);background:var(--paper);
  box-shadow:var(--shadow-lg);position:relative;
}
.calc-grid{display:grid;grid-template-columns:1.05fr .95fr}
.calc-input{padding:clamp(1.2rem,1rem + 1vw,1.9rem);border-right:1px solid var(--rule)}
.calc-out{padding:clamp(1.2rem,1rem + 1vw,1.9rem);background:var(--ground-2);display:flex;flex-direction:column}

.calc-head{display:flex;align-items:center;justify-content:space-between;gap:1rem;margin-bottom:1.3rem}
.calc-head h2{font-size:1.12rem;letter-spacing:-.01em}

.unit-switch{display:inline-flex;border:1px solid var(--rule-2);border-radius:3px;overflow:hidden}
.unit-btn{
  border:0;background:var(--paper);color:var(--muted);cursor:pointer;
  font-family:var(--mono);font-size:.72rem;font-weight:500;letter-spacing:.06em;
  text-transform:uppercase;padding:.5rem .8rem;transition:.15s;
}
.unit-btn + .unit-btn{border-left:1px solid var(--rule-2)}
.unit-btn:hover{color:var(--ink)}
.unit-btn.is-active{background:var(--ink);color:var(--paper)}

.field-row{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
.field label,.conv-field label{
  display:block;font-family:var(--mono);font-size:.68rem;font-weight:500;
  letter-spacing:.11em;text-transform:uppercase;color:var(--muted);margin-bottom:.45rem;
}
.input-wrap{position:relative;display:flex;align-items:center}
.input-duo{display:grid;grid-template-columns:1fr 1fr;gap:.5rem}
.input-wrap input{
  width:100%;font-family:var(--mono);font-size:1.15rem;font-weight:500;
  color:var(--ink);background:var(--paper);
  padding:.78rem 3rem .78rem .8rem;
  border:1px solid var(--rule-2);border-radius:2px;
  transition:border-color .15s,box-shadow .15s;
}
.input-wrap input::placeholder{color:var(--faint);font-weight:400}
.input-wrap input:focus{outline:none;border-color:var(--accent);box-shadow:inset 0 0 0 1px var(--accent)}
.input-wrap input.is-invalid{border-color:var(--b-ob2)}
.input-wrap .suffix{
  position:absolute;right:.75rem;font-family:var(--mono);font-size:.74rem;
  color:var(--faint);pointer-events:none;letter-spacing:.04em;
}
.input-wrap input::-webkit-outer-spin-button,.input-wrap input::-webkit-inner-spin-button{-webkit-appearance:none;margin:0}
.input-wrap input[type=number]{-moz-appearance:textfield}
.is-hidden{display:none}

.calc-error{
  margin-top:.9rem;font-size:.86rem;font-weight:500;color:var(--b-ob2);
  padding-left:.75rem;border-left:2px solid var(--b-ob2);
}
.calc-actions{display:flex;gap:.6rem;margin-top:1.3rem}
.calc-actions .btn-primary{flex:1}

.calc-fine{
  margin-top:1rem;font-size:.78rem;color:var(--faint);line-height:1.55;
}

/* --- readout pane --- */
.out-label{
  font-family:var(--mono);font-size:.68rem;font-weight:500;letter-spacing:.13em;
  text-transform:uppercase;color:var(--muted);margin-bottom:.9rem;
}
.out-empty{
  flex:1;display:flex;flex-direction:column;justify-content:center;
  font-size:.9rem;color:var(--faint);border:1px dashed var(--rule-2);padding:1.4rem;text-align:center;
}
.out-empty strong{display:block;font-family:var(--mono);font-size:.8rem;color:var(--muted);margin-bottom:.35rem;letter-spacing:.06em}

.readout{display:flex;align-items:baseline;gap:.6rem;flex-wrap:wrap}
.readout-num{
  font-family:var(--mono);font-size:clamp(3rem,2rem + 4vw,4.4rem);font-weight:600;
  line-height:.92;color:var(--ink);letter-spacing:-.045em;font-variant-numeric:tabular-nums;
}
.readout-unit{font-family:var(--mono);font-size:.85rem;color:var(--muted)}

.verdict{
  display:inline-flex;align-items:center;gap:.5rem;margin-top:.9rem;
  font-family:var(--mono);font-size:.76rem;font-weight:600;letter-spacing:.08em;
  text-transform:uppercase;padding:.4rem .7rem;border-radius:2px;
}
/* Filled chip: band colour as the fill, its -on token as the text,
   so the label is never set in a low-contrast band colour. */
.verdict[data-cat="under"]{background:var(--b-under);color:var(--b-under-on)}
.verdict[data-cat="normal"]{background:var(--b-normal);color:var(--b-normal-on)}
.verdict[data-cat="over"]{background:var(--b-over);color:var(--b-over-on)}
.verdict[data-cat="ob1"]{background:var(--b-ob1);color:var(--b-ob1-on)}
.verdict[data-cat="ob2"]{background:var(--b-ob2);color:var(--b-ob2-on)}
.verdict[data-cat="ob3"]{background:var(--b-ob3);color:var(--b-ob3-on)}

/* Scale: the reading placed on the WHO band */
.scale{margin-top:1.5rem}
.scale-track{position:relative;display:flex;height:8px}
.scale-track .seg{height:100%}
.seg-under{flex:3.5;background:var(--b-under)}
.seg-normal{flex:6.5;background:var(--b-normal)}
.seg-over{flex:5;background:var(--b-over)}
.seg-ob1{flex:5;background:var(--b-ob1)}
.seg-ob2{flex:5;background:var(--b-ob2)}
.seg-ob3{flex:3;background:var(--b-ob3)}
.marker{
  position:absolute;top:-5px;bottom:-5px;left:0;width:2px;background:var(--ink);
  transform:translateX(-1px);transition:left .45s cubic-bezier(.4,0,.2,1);
}
.marker::after{
  content:"";position:absolute;top:-4px;left:50%;transform:translateX(-50%);
  border-left:4px solid transparent;border-right:4px solid transparent;border-top:5px solid var(--ink);
}
.scale-ticks{
  display:flex;justify-content:space-between;margin-top:.4rem;
  font-family:var(--mono);font-size:.66rem;color:var(--faint);font-variant-numeric:tabular-nums;
}

.out-facts{margin-top:1.4rem;display:flex;flex-direction:column;gap:.5rem}
.out-facts div{display:flex;justify-content:space-between;gap:1rem;padding-bottom:.45rem;border-bottom:1px solid var(--rule)}
.out-facts dt{font-size:.82rem;color:var(--muted)}
.out-facts dd{margin:0;font-family:var(--mono);font-size:.82rem;font-weight:600;color:var(--ink);text-align:right;font-variant-numeric:tabular-nums}
.out-msg{margin-top:1rem;font-size:.88rem;color:var(--body);line-height:1.6}

/* =========================================================
   Unit converter — a drawer under the instrument
   ========================================================= */
.conv{border-top:1px solid var(--rule-2);background:var(--paper)}
.conv summary{
  list-style:none;cursor:pointer;display:flex;align-items:center;gap:.7rem;
  padding:.8rem clamp(1.2rem,1rem + 1vw,1.9rem);position:relative;
}
.conv summary::-webkit-details-marker{display:none}
.conv summary strong{font-size:.9rem;color:var(--ink);font-weight:600}
.conv summary em{font-style:normal;font-size:.82rem;color:var(--faint)}
.conv-chev{
  margin-left:auto;font-family:var(--mono);font-size:.7rem;letter-spacing:.08em;
  text-transform:uppercase;color:var(--accent);flex:none;
}
.conv[open] .conv-chev span::after{content:"close"}
.conv:not([open]) .conv-chev span::after{content:"open"}
.conv[open] summary{border-bottom:1px solid var(--rule)}

.conv-body{padding:1.1rem clamp(1.2rem,1rem + 1vw,1.9rem) 1.4rem;background:var(--ground-2)}
.conv-tabs{display:flex;flex-wrap:wrap;gap:0;margin-bottom:1.1rem;border-bottom:1px solid var(--rule-2)}
.conv-tab{
  border:0;background:none;cursor:pointer;color:var(--muted);
  font-family:var(--mono);font-size:.72rem;font-weight:500;letter-spacing:.08em;
  text-transform:uppercase;padding:.55rem .85rem;margin-bottom:-1px;
  border-bottom:2px solid transparent;transition:.15s;
}
.conv-tab:hover{color:var(--ink)}
.conv-tab.is-active{color:var(--ink);border-bottom-color:var(--accent)}

.conv-row{display:grid;grid-template-columns:1fr auto 1fr;gap:.7rem;align-items:end}
.conv-field{display:flex;flex-direction:column;gap:.4rem;min-width:0}
.conv-field input,.conv-field select{
  width:100%;font-family:var(--mono);font-size:.92rem;color:var(--ink);
  background:var(--paper);border:1px solid var(--rule-2);border-radius:2px;
  padding:.62rem .7rem;transition:border-color .15s;
}
.conv-field input{font-weight:600;font-variant-numeric:tabular-nums}
.conv-field select{cursor:pointer;font-size:.82rem}
.conv-field input:focus,.conv-field select:focus{outline:none;border-color:var(--accent)}
#convResult{background:var(--ground);color:var(--accent);cursor:text}
.conv-field input::-webkit-outer-spin-button,.conv-field input::-webkit-inner-spin-button{-webkit-appearance:none;margin:0}
.conv-field input[type=number]{-moz-appearance:textfield}

.conv-swap{
  align-self:end;margin-bottom:.05rem;width:36px;height:36px;flex:none;cursor:pointer;
  border:1px solid var(--rule-2);background:var(--paper);border-radius:2px;
  display:grid;place-items:center;color:var(--muted);transition:.15s;
}
.conv-swap:hover{background:var(--ink);border-color:var(--ink);color:var(--paper)}
.conv-swap svg{width:16px;height:16px}
.conv-note{
  margin-top:.9rem;font-family:var(--mono);font-size:.78rem;color:var(--muted);
  font-variant-numeric:tabular-nums;overflow-wrap:anywhere;
  padding-left:.7rem;border-left:2px solid var(--accent);
}

/* =========================================================
   Category bands — the WHO scale as a reference strip
   ========================================================= */
.bands{margin-top:1.8rem;display:grid;grid-template-columns:3.5fr 6.5fr 5fr 5fr 5fr 3fr;gap:1px;background:var(--rule)}
.bands div{background:var(--paper);padding:.85rem .8rem;border-top:3px solid}
.bands dt{font-family:var(--mono);font-size:.68rem;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin-bottom:.25rem}
.bands dd{margin:0;font-family:var(--mono);font-size:.92rem;font-weight:600;color:var(--ink);font-variant-numeric:tabular-nums}
.bands .k-under{border-top-color:var(--b-under)}
.bands .k-normal{border-top-color:var(--b-normal)}
.bands .k-over{border-top-color:var(--b-over)}
.bands .k-ob1{border-top-color:var(--b-ob1)}
.bands .k-ob2{border-top-color:var(--b-ob2)}
.bands .k-ob3{border-top-color:var(--b-ob3)}

/* =========================================================
   Steps — a real sequence, so it gets real numbers on a rule
   ========================================================= */
.steps{margin-top:1.5rem;display:grid;grid-template-columns:repeat(3,1fr);gap:0;border-top:1px solid var(--rule-2)}
.steps li{padding:1.4rem 1.6rem 0 0}
.steps li + li{border-left:1px solid var(--rule);padding-left:1.6rem}
.step-n{
  font-family:var(--mono);font-size:.72rem;font-weight:600;letter-spacing:.1em;
  color:var(--accent);display:block;margin-bottom:.7rem;
}
.steps h3{font-size:1.02rem;margin-bottom:.4rem}
.steps p{font-size:.92rem;color:var(--muted)}
.steps-note{
  margin-top:1.4rem;font-size:.88rem;color:var(--muted);
  padding-left:.85rem;border-left:2px solid var(--rule-2);
}

/* =========================================================
   Feature row — rules, not cards
   ========================================================= */
.features{margin-top:1.5rem;display:grid;grid-template-columns:repeat(3,1fr);gap:0}
.features li{padding:1.5rem 1.6rem 1.5rem 0;border-top:1px solid var(--night-rule)}
.features li + li{border-left:1px solid var(--night-rule);padding-left:1.6rem}
.features h3{font-size:1.05rem;margin-bottom:.35rem}
.features p{color:var(--on-night-muted);font-size:.92rem}
.feat-n{font-family:var(--mono);font-size:.68rem;letter-spacing:.12em;color:var(--on-night-accent);display:block;margin-bottom:.8rem}

/* =========================================================
   Comparison — formula as the typographic centrepiece
   ========================================================= */
.compare{margin-top:1.5rem;display:grid;grid-template-columns:1fr auto 1fr;gap:clamp(1.2rem,3vw,3rem);align-items:center}
.compare-col h3{font-size:.95rem;margin-bottom:.9rem;font-family:var(--mono);font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.compare-col li{position:relative;padding-left:1.1rem;font-size:.94rem;margin-bottom:.65rem}
.compare-col li::before{content:"";position:absolute;left:0;top:.72em;width:5px;height:1.5px;background:var(--rule-2)}
.compare-col li:last-child{margin-bottom:0}

.formula{text-align:center;padding-inline:clamp(.5rem,2vw,1.5rem)}
.formula-top,.formula-bot{
  font-family:var(--display);font-size:clamp(1.05rem,.9rem + .7vw,1.5rem);
  font-weight:700;color:var(--ink);letter-spacing:-.02em;
}
.formula-bar{height:2px;background:var(--ink);margin:.35rem 0}
.formula-cap{
  display:block;margin-top:.8rem;font-family:var(--mono);font-size:.66rem;
  letter-spacing:.1em;text-transform:uppercase;color:var(--faint);line-height:1.7;
}

.callout{
  margin-top:1.5rem;padding:1.2rem 1.4rem;background:var(--accent-soft);
  border-left:3px solid var(--accent);color:var(--ink-2);font-size:.96rem;
}

/* =========================================================
   Chart + table
   ========================================================= */
.chart{margin-top:1.8rem}
.chart-track{display:flex;height:30px;font-family:var(--mono)}
.chart-track div{display:grid;place-items:center;font-size:.7rem;font-weight:600}
.chart-scale{display:flex;margin-top:.4rem;font-family:var(--mono);font-size:.68rem;color:var(--faint);font-variant-numeric:tabular-nums}
.chart-scale span{position:relative;padding-top:.35rem;border-top:1px solid var(--rule-2)}
.chart-scale span::before{content:"";position:absolute;left:0;top:0;width:1px;height:5px;background:var(--rule-2)}

.table-wrap{margin-top:1.8rem;overflow-x:auto}
.bmi-table{width:100%;border-collapse:collapse;min-width:540px;font-size:.93rem}
.bmi-table caption{
  text-align:left;padding-bottom:.8rem;font-family:var(--mono);font-size:.68rem;
  letter-spacing:.11em;text-transform:uppercase;color:var(--faint);
}
.bmi-table th,.bmi-table td{padding:.8rem 1rem;text-align:left;border-bottom:1px solid var(--rule)}
.bmi-table thead th{
  font-family:var(--mono);font-size:.66rem;letter-spacing:.11em;text-transform:uppercase;
  color:var(--muted);font-weight:500;border-bottom:1px solid var(--rule-2);padding-bottom:.6rem;
}
.bmi-table tbody th{font-weight:600;color:var(--ink)}
.bmi-table tbody th span{display:inline-block;width:3px;height:13px;margin-right:.6rem;vertical-align:-2px}
.bmi-table td:nth-child(2){font-family:var(--mono);font-variant-numeric:tabular-nums;color:var(--ink)}
.bmi-table td:last-child{color:var(--muted)}
.bmi-table tbody tr:last-child th,.bmi-table tbody tr:last-child td{border-bottom:0}
.k-under-bg{background:var(--b-under);color:var(--b-under-on)}.k-normal-bg{background:var(--b-normal);color:var(--b-normal-on)}.k-over-bg{background:var(--b-over);color:var(--b-over-on)}
.k-ob1-bg{background:var(--b-ob1);color:var(--b-ob1-on)}.k-ob2-bg{background:var(--b-ob2);color:var(--b-ob2-on)}.k-ob3-bg{background:var(--b-ob3);color:var(--b-ob3-on)}

/* =========================================================
   Risks — offset columns, severity stripe
   ========================================================= */
.risks{margin-top:1.5rem;display:grid;grid-template-columns:1fr 1fr;gap:clamp(1.4rem,3vw,3rem)}
.risk{border-top:3px solid;padding-top:1.2rem}
.risk-high{border-top-color:var(--b-ob2)}
.risk-low{border-top-color:var(--b-under)}
.risk-low{margin-top:clamp(0rem,3vw,2.6rem)}
.risk h3{font-size:1.3rem;margin-bottom:.15rem}
.risk-src{font-family:var(--mono);font-size:.68rem;letter-spacing:.1em;text-transform:uppercase;color:var(--faint);margin-bottom:.9rem}
.risk > p{font-size:.94rem;margin-bottom:1rem}
.risk-list{columns:2;column-gap:1.4rem;margin-bottom:1.1rem}
.risk-list li{
  break-inside:avoid;font-size:.9rem;padding:.32rem 0;border-bottom:1px solid var(--rule);
  color:var(--ink-2);
}
.risk-note{font-size:.87rem;color:var(--muted);padding-left:.85rem;border-left:2px solid var(--rule-2)}

/* =========================================================
   Habits — plain rules
   ========================================================= */
.habits{margin-top:1.8rem;display:grid;grid-template-columns:repeat(4,1fr);gap:0}
.habits li{padding:1.1rem 1.2rem 0 0;border-top:1px solid var(--rule-2)}
.habits li + li{border-left:1px solid var(--rule);padding-left:1.2rem}
.habits h3{font-size:.98rem;margin-bottom:.3rem}
.habits p{font-size:.88rem;color:var(--muted)}

/* =========================================================
   Exclusions — a real alert band
   ========================================================= */
.band-warn{background:var(--b-ob3-bg);border-block:1px solid var(--b-ob3)}
.band-warn .rail-label{color:var(--b-ob3);border-color:var(--b-ob3)}
.band-warn .rail-label span{color:var(--b-ob3)}
.excl{margin-top:1.4rem;display:flex;flex-wrap:wrap;gap:.5rem}
.excl li{
  font-family:var(--mono);font-size:.8rem;font-weight:500;color:var(--b-ob3);
  border:1px solid var(--b-ob3);padding:.45rem .8rem;background:transparent;
}

.excl a{color:inherit;text-decoration:underline;text-underline-offset:3px}
.excl a:hover{text-decoration-thickness:2px}
.callout a,.measure a,.lede a,.faq-a a{text-decoration:underline;text-decoration-color:var(--rule-2)}
.callout a:hover,.measure a:hover,.lede a:hover,.faq-a a:hover{text-decoration-color:var(--accent)}

/* =========================================================
   Closing CTA
   ========================================================= */
.cta-grid{align-items:end}
.cta-copy{grid-column:1/9}
.cta-act{grid-column:10/13;align-self:end}
.cta-copy p{color:var(--on-night-muted);margin-top:1rem;max-width:60ch}

/* =========================================================
   FAQ
   ========================================================= */
.faq{margin-top:1.4rem;border-top:1px solid var(--rule-2)}
.faq-item{border-bottom:1px solid var(--rule)}
.faq-item summary{
  list-style:none;cursor:pointer;padding:1.05rem 2.4rem 1.05rem 0;position:relative;
  font-size:1.02rem;font-weight:600;color:var(--ink);font-family:var(--display);letter-spacing:-.01em;
}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{
  content:"+";position:absolute;right:.4rem;top:50%;transform:translateY(-50%);
  font-family:var(--mono);font-size:1.1rem;color:var(--accent);font-weight:400;
}
.faq-item[open] summary::after{content:"–"}
.faq-item .faq-a{padding:0 3rem 1.15rem 0;font-size:.95rem;color:var(--body);max-width:72ch}

/* =========================================================
   Guides list (homepage) — ruled grid, whole cell is the link
   ========================================================= */
/* 1px gaps over a rule-coloured ground draw the dividers, so a
   spanning (featured) cell never breaks the border pattern. */
.guides{
  margin-top:1.5rem;display:grid;grid-template-columns:repeat(3,1fr);gap:1px;
  background:var(--rule);border:1px solid var(--rule);
}
.guides li{background:var(--guides-bg,var(--ground))}
.related{--guides-bg:var(--paper)}
.guides a{display:flex;flex-direction:column;height:100%;padding:1.3rem 1.3rem 1.4rem;color:inherit;transition:background .15s}
.guides a:hover{text-decoration:none;background:var(--guides-hover,var(--paper))}
.related .guides{--guides-hover:var(--ground)}
.guide-featured{grid-column:span 2}
.guide-featured a{padding:1.6rem 1.6rem 1.7rem;background:var(--paper)}
.guide-featured h3{font-size:clamp(1.35rem,1.1rem + .9vw,1.7rem)}
.guide-featured p{font-size:.95rem;max-width:48ch}
.guide-featured .guide-tag::before{content:"Most searched · "}
.guides a:hover h3{color:var(--accent)}
.guide-tag{font-family:var(--mono);font-size:.66rem;letter-spacing:.12em;text-transform:uppercase;color:var(--accent);margin-bottom:.6rem}
.guides h3{font-size:1.05rem;margin-bottom:.4rem;transition:color .15s}
.guides p{font-size:.88rem;color:var(--muted);flex:1}
.guide-go{margin-top:.9rem;font-family:var(--mono);font-size:.7rem;letter-spacing:.06em;color:var(--ink)}
.guide-go::after{content:" →";color:var(--accent)}

/* =========================================================
   Article pages
   ========================================================= */
.article-hero{background:var(--paper);padding-block:clamp(1.6rem,1.2rem + 1.4vw,2.6rem) clamp(1.5rem,1.1rem + 1.2vw,2.2rem);border-bottom:1px solid var(--rule)}
.crumbs{grid-column:1/13;display:flex;flex-wrap:wrap;gap:.4rem;font-family:var(--mono);font-size:.7rem;letter-spacing:.05em;color:var(--faint);margin-bottom:1.6rem}
.crumbs a{color:var(--muted)}
.crumbs li + li::before{content:"/";margin-right:.4rem;color:var(--rule-2)}
.article-hero .hero-col{grid-column:1/10}
.article-hero h1{font-size:clamp(2.1rem,1.4rem + 2.9vw,3.5rem)}
.standfirst{margin-top:1.1rem;font-size:clamp(1.05rem,1rem + .35vw,1.22rem);color:var(--body);max-width:60ch}
.article-meta{margin-top:1.5rem;display:flex;flex-wrap:wrap;gap:.3rem 1.4rem;font-family:var(--mono);font-size:.7rem;letter-spacing:.05em;color:var(--faint)}
.article-meta b{color:var(--ink);font-weight:600}

.article-body{padding-block:clamp(1.8rem,1.4rem + 1.6vw,3rem)}
.toc{grid-column:1/4;align-self:start;position:sticky;top:88px}
.toc-label{font-family:var(--mono);font-size:.66rem;letter-spacing:.14em;text-transform:uppercase;color:var(--faint);padding-top:.55rem;border-top:1px solid var(--rule-2);display:block;margin-bottom:.8rem}
.toc ol{display:flex;flex-direction:column;gap:.15rem;border-left:1px solid var(--rule)}
.toc a{display:block;font-size:.86rem;line-height:1.4;color:var(--muted);padding:.35rem 0 .35rem .85rem;margin-left:-1px;border-left:2px solid transparent}
.toc a:hover{color:var(--ink);text-decoration:none}
.toc a.is-current{color:var(--ink);border-left-color:var(--accent)}
.toc-cta{margin-top:1.6rem}

.prose{grid-column:4/11;min-width:0;color:var(--body);font-size:1.02rem;line-height:1.75}
.prose > * + *{margin-top:1.1em}
.prose h2{font-size:clamp(1.45rem,1.2rem + 1vw,1.9rem);margin-top:1.9em;scroll-margin-top:88px}
.prose h3{font-size:1.14rem;margin-top:1.9em}
.prose h2 + *,.prose h3 + *{margin-top:.7em}
.prose > :first-child{margin-top:0}
.prose strong{color:var(--ink);font-weight:600}
.prose a{text-decoration:underline;text-decoration-color:var(--rule-2)}
.prose a:hover{text-decoration-color:var(--accent)}
.prose ul li,.prose ol li{position:relative;padding-left:1.35rem}
.prose ul li + li,.prose ol li + li{margin-top:.45em}
.prose ul li::before{content:"";position:absolute;left:.15rem;top:.78em;width:6px;height:1.5px;background:var(--accent)}
.prose ol{counter-reset:li}
.prose ol li{counter-increment:li}
.prose ol li::before{content:counter(li);position:absolute;left:0;top:.08em;font-family:var(--mono);font-size:.8rem;font-weight:600;color:var(--accent)}

/* Quick answer box at the top of each guide */
.answer{background:var(--paper);border:1px solid var(--rule-2);border-left:3px solid var(--accent);padding:1.1rem 1.3rem}
.answer-label{display:block;font-family:var(--mono);font-size:.66rem;letter-spacing:.13em;text-transform:uppercase;color:var(--accent);margin-bottom:.4rem}
.answer p{font-size:.98rem;color:var(--ink-2)}

.formula-line{
  font-family:var(--mono);font-size:.95rem;color:var(--ink);background:var(--paper);
  border:1px solid var(--rule);padding:.9rem 1.1rem;overflow-x:auto;white-space:nowrap;
}
.worked{background:var(--ground-2);padding:1.1rem 1.3rem;border-left:2px solid var(--rule-2)}
.worked-label{display:block;font-family:var(--mono);font-size:.66rem;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin-bottom:.5rem}
.worked p{font-family:var(--mono);font-size:.86rem;line-height:1.8;color:var(--ink-2)}

.note{background:var(--b-over-bg);border-left:3px solid var(--b-over);padding:1rem 1.2rem;font-size:.94rem;color:var(--ink-2)}

.data-table-wrap{overflow-x:auto;border:1px solid var(--rule);background:var(--paper)}
.data-table{width:100%;border-collapse:collapse;font-size:.88rem;min-width:520px}
.data-table caption{text-align:left;padding:.8rem 1rem;font-family:var(--mono);font-size:.66rem;letter-spacing:.11em;text-transform:uppercase;color:var(--faint);border-bottom:1px solid var(--rule)}
.data-table th,.data-table td{padding:.6rem 1rem;text-align:left;border-bottom:1px solid var(--rule)}
.data-table thead th{font-family:var(--mono);font-size:.66rem;letter-spacing:.1em;text-transform:uppercase;font-weight:500;color:var(--muted);background:var(--ground-2)}
.data-table td{font-family:var(--mono);font-variant-numeric:tabular-nums;color:var(--ink)}
.data-table tbody th{font-family:var(--mono);font-weight:600;color:var(--ink);white-space:nowrap}
.data-table tbody tr:nth-child(even){background:var(--ground)}
.data-table tbody tr:last-child th,.data-table tbody tr:last-child td{border-bottom:0}
/* Band columns: text stays ink; a swatch carries the band colour */
.data-table .col-h::before,.data-table .col-o::before,.data-table .col-ob::before{content:"";display:inline-block;width:8px;height:8px;margin-right:.5rem;vertical-align:1px}
.data-table .col-h::before{background:var(--b-normal)}
.data-table .col-o::before{background:var(--b-over)}
.data-table .col-ob::before{background:var(--b-ob2)}

/* =========================================================
   BMI grid — height × weight, each cell is a BMI value
   coloured by its WHO band (diverging scale, see tokens)
   ========================================================= */
.legend{display:flex;flex-wrap:wrap;gap:.45rem 1.1rem;font-family:var(--mono);font-size:.72rem;color:var(--body)}
.legend span{display:inline-flex;align-items:center;gap:.45rem}
.legend i{width:12px;height:12px;flex:none;display:inline-block}
.legend .l-normal{background:var(--b-normal-bg);box-shadow:inset 0 0 0 1px var(--b-normal)}

.bmi-grid-wrap{position:relative;overflow-x:auto;border:1px solid var(--rule);background:var(--paper)}
.bmi-grid{border-collapse:separate;border-spacing:2px;font-family:var(--mono);font-size:.74rem;font-variant-numeric:tabular-nums;margin:0 auto}
.bmi-grid caption{caption-side:top;text-align:left;padding:.8rem .6rem .5rem;font-size:.66rem;letter-spacing:.11em;text-transform:uppercase;color:var(--faint)}
.bmi-grid thead th{font-weight:500;color:var(--muted);padding:.45rem .2rem;min-width:2.9rem;text-align:center;white-space:nowrap}
.bmi-grid thead th:first-child{text-align:left;padding-left:.6rem}
.bmi-grid tbody th{
  position:sticky;left:0;z-index:1;background:var(--paper);
  text-align:left;font-weight:600;color:var(--ink);padding:.45rem .7rem .45rem .6rem;white-space:nowrap;
}
.bmi-grid td{text-align:center;padding:.45rem .2rem;cursor:default;transition:box-shadow .1s}
.bmi-grid td:hover{box-shadow:inset 0 0 0 2px var(--ink)}
.g-under{background:var(--b-under);color:var(--b-under-on)}
.g-normal{background:var(--b-normal-bg);color:var(--ink)}
.g-over{background:var(--b-over);color:var(--b-over-on)}
.g-ob1{background:var(--b-ob1);color:var(--b-ob1-on)}
.g-ob2{background:var(--b-ob2);color:var(--b-ob2-on)}
.g-ob3{background:var(--b-ob3);color:var(--b-ob3-on)}

.grid-tip{
  position:fixed;z-index:120;pointer-events:none;
  background:var(--night);color:var(--on-night);border-radius:2px;
  padding:.55rem .7rem;font-family:var(--mono);font-size:.74rem;line-height:1.5;
  box-shadow:var(--shadow-lg);white-space:nowrap;
}
.grid-tip b{color:#fff;font-weight:600}
.grid-tip i{display:inline-block;width:8px;height:8px;margin-right:.4rem;vertical-align:0}
.grid-note{font-size:.84rem;color:var(--muted)}

/* Chart pages: the article takes the full right-hand track so the
   16-column grid fits on desktop; running text keeps a readable measure. */
.prose-wide{grid-column:4/13}
.prose-wide > :not(.bmi-grid-wrap):not(.data-table-wrap):not(.legend):not(.inline-cta){max-width:68ch}

.inline-cta{
  display:flex;align-items:center;justify-content:space-between;gap:1rem;flex-wrap:wrap;
  background:var(--night);color:var(--on-night);padding:1.2rem 1.4rem;
}
.inline-cta p{font-size:.95rem;color:var(--on-night)}
.inline-cta strong{color:#fff}
.inline-cta .btn{flex:none}

.sources{font-size:.86rem;color:var(--muted);border-top:1px solid var(--rule);padding-top:1.2rem}
.prose .sources h2{font-size:.72rem;font-family:var(--mono);letter-spacing:.13em;text-transform:uppercase;color:var(--faint);margin:0 0 .6rem}
.sources li + li{margin-top:.3em}

.related{padding-block:clamp(1.8rem,1.4rem + 1.4vw,2.8rem);background:var(--paper);border-top:1px solid var(--rule)}

/* =========================================================
   Footer
   ========================================================= */
.site-footer{background:var(--night);color:var(--on-night-muted);padding-block:2.2rem 1.1rem;font-size:.9rem}
.footer-grid{gap:2rem clamp(1rem,2.4vw,2.2rem)}
/* 4 + 2 + 2 + 4 = 12 columns */
.footer-brand{grid-column:1/5}
.footer-brand .brand-text{color:#fff}
.footer-brand .brand-text b{color:var(--on-night-accent)}
.footer-brand p{margin-top:.9rem;color:var(--on-night-faint);max-width:32ch;font-size:.87rem}
.footer-col{grid-column:span 2;display:flex;flex-direction:column;gap:.5rem}
.footer-col-wide{grid-column:span 6}
.footer-links{columns:2;column-gap:1.8rem}
.footer-links a{display:block;margin-bottom:.5rem;break-inside:avoid}
.footer-col a[aria-current],.footer-legal a[aria-current]{color:var(--on-night-accent)}
.footer-legal{display:flex;flex-wrap:wrap;justify-content:center;gap:.3rem 1.1rem}
.footer-legal a{color:var(--on-night-muted)}
.privacy-settings{
  background:none;border:0;padding:0;cursor:pointer;
  font:inherit;letter-spacing:inherit;color:var(--on-night-muted);
  text-decoration:underline;text-underline-offset:3px;text-decoration-color:var(--night-rule);
}
.privacy-settings:hover{color:var(--on-night-accent)}
.footer-legal a:hover{color:var(--on-night-accent)}
.chart-more{margin-top:1.2rem;font-size:.92rem;color:var(--muted)}
.chart-more a{font-weight:600}
.chart-more a::after{content:' →'}
.footer-col h4{
  color:#fff;font-family:var(--mono);font-size:.66rem;letter-spacing:.13em;
  text-transform:uppercase;margin-bottom:.35rem;font-weight:500;
}
.footer-col a{color:var(--on-night-muted);font-size:.89rem}
.footer-col a:hover{color:var(--on-night-accent)}
.footer-col p{color:var(--on-night-faint);font-size:.85rem;line-height:1.6}
/* Copyright centred, back-to-top sits beside it on the same line */
.footer-bottom{
  display:flex;justify-content:center;align-items:center;gap:.4rem 1.4rem;flex-wrap:wrap;
  text-align:center;margin-top:2.2rem;padding-top:1.1rem;border-top:1px solid var(--night-rule);
  font-family:var(--mono);font-size:.72rem;letter-spacing:.04em;color:var(--on-night-faint);
}
.footer-bottom a{color:var(--on-night-accent)}

/* =========================================================
   Sticky mobile bar
   ========================================================= */
.mobile-bar{
  position:fixed;left:0;right:0;bottom:0;z-index:90;display:none;
  padding:.65rem var(--gutter) calc(.65rem + env(safe-area-inset-bottom));
  background:var(--paper);border-top:1px solid var(--rule-2);
  transform:translateY(110%);transition:transform .25s ease;
}
.mobile-bar.is-shown{transform:none}

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width:1080px){
  .rail{grid-column:1/13;margin-bottom:1rem}
  .rail-label{display:flex;gap:.6rem;align-items:baseline}
  .col-main,.col-text,.col-right{grid-column:1/13}
  .hero-head,.hero-lede{grid-column:1/13}
  .hero-meta{grid-column:1/13;align-self:start;padding-top:1.4rem;padding-bottom:0}
  .spec{display:grid;grid-template-columns:repeat(4,1fr);gap:.5rem 1.4rem}
  .cta-copy,.cta-act{grid-column:1/13}
  .cta-act{margin-top:1.4rem}
  .footer-brand{grid-column:1/13}
  .footer-col{grid-column:span 4}
  .footer-col-wide{grid-column:span 8}

  /* Articles: contents list moves above the text, no longer sticky */
  .article-hero .hero-col{grid-column:1/13}
  .toc{grid-column:1/13;position:static;margin-bottom:2rem}
  .toc ol{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:0 1rem;border-left:0}
  .toc a{border-left:0;padding-left:0;border-bottom:1px solid var(--rule)}
  .toc-cta{display:none}
  .prose{grid-column:1/13;max-width:72ch}
  .prose-wide{max-width:none}
}

@media (max-width:900px){
  .calc-grid{grid-template-columns:1fr}
  .calc-input{border-right:0;border-bottom:1px solid var(--rule)}
  .bands{grid-template-columns:repeat(3,1fr)}
  .steps,.features,.habits{grid-template-columns:1fr 1fr}
  .steps li,.features li,.habits li{padding-right:1.2rem}
  .steps li:nth-child(odd),.features li:nth-child(odd),.habits li:nth-child(odd){border-left:0;padding-left:0}
  .steps li:nth-child(n+3),.habits li:nth-child(n+3){border-top:1px solid var(--rule);margin-top:1.2rem}
  .risks{grid-template-columns:1fr}
  .risk-low{margin-top:0}
  .guides{grid-template-columns:1fr 1fr}

  .compare{grid-template-columns:1fr;gap:1.6rem}
  .formula{padding-block:1.2rem;border-block:1px solid var(--rule)}
}

@media (max-width:820px){
  .nav-toggle{display:grid}
  .site-nav{
    display:none;position:absolute;top:100%;left:0;right:0;
    flex-direction:column;align-items:stretch;gap:0;
    background:var(--paper);border-bottom:1px solid var(--rule-2);
    padding:.4rem var(--gutter) 1rem;box-shadow:var(--shadow);
    max-height:calc(100dvh - 64px);overflow-y:auto;
  }
  .site-nav.is-open{display:flex}
  .site-nav a{padding:.85rem 0;border-bottom:1px solid var(--rule);font-size:.85rem}
  .site-nav a:hover{border-bottom-color:var(--rule)}
  .site-nav .nav-cta{margin-top:.9rem;text-align:center;border-bottom:0;padding:.8rem 1rem}
}

@media (max-width:680px){
  .mobile-bar{display:block}
  body{padding-bottom:70px}
  html{scroll-padding-top:70px}
  .chart-track div{font-size:0}
  .chart-track div::after{content:attr(data-short);font-size:.62rem}
  .bands{grid-template-columns:1fr 1fr}
  .risk-list{columns:1}
}

@media (max-width:560px){
  body{font-size:16px}
  .steps,.features,.habits{grid-template-columns:1fr}
  .steps li,.features li,.habits li{
    border-left:0;padding-left:0;padding-right:0;
    border-top:1px solid var(--rule);margin-top:0;padding-top:1.1rem;
  }
  .steps li:first-child,.features li:first-child,.habits li:first-child{border-top:1px solid var(--rule-2)}
  .field-row,.conv-row{grid-template-columns:1fr}
  .conv-swap{justify-self:start;transform:rotate(90deg)}
  .calc-actions{flex-direction:column}
  .spec{grid-template-columns:1fr 1fr}
  .footer-col,.footer-col-wide{grid-column:1/13}
  .bands{grid-template-columns:1fr}
  .guides{grid-template-columns:1fr}
  .guide-featured{grid-column:auto}
  .footer-links{columns:1}
  .inline-cta{flex-direction:column;align-items:stretch}
  .inline-cta .btn{width:100%}
  .prose{font-size:1rem}
  .readout-num{font-size:3.2rem}
  .faq-item .faq-a{padding-right:0}
  .calc-head{flex-direction:column;align-items:flex-start;gap:.8rem}
}

@media (max-width:400px){
  .brand-text{font-size:.95rem}
  .excl li{width:100%}
}

/* =========================================================
   Print
   ========================================================= */
@media print{
  .site-header,.mobile-bar,.site-footer,.calc-actions,.unit-switch,.conv,.skip-link{display:none!important}
  body{background:#fff;color:#000;font-size:11pt;padding:0}
  .section{padding-block:1rem;break-inside:avoid}
  a{color:#000;text-decoration:underline}
}

@media (prefers-reduced-motion:reduce){
  *{animation-duration:.01ms!important;transition-duration:.01ms!important;scroll-behavior:auto!important}
}