:root{
  --bg:#f3f5f4; --card:#ffffff; --ink:#0f1a14; --text:#526158; --line:#e4e9e6;
  --green:#0f8f4b; --focus:#0f8f4b;
  --font:"Inter",system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;

  /* Fluid spacing and type: scale smoothly from small phones to desktop */
  --gutter:clamp(1rem,4vw,1.75rem);
  --card-pad-y:clamp(1rem,3vw,1.5rem);
  --card-pad-x:clamp(1rem,3.5vw,1.75rem);
  --radius:clamp(1rem,3vw,1.5rem);
  --fs-body:clamp(.9375rem,.9rem + .2vw,1.0625rem);
  --fs-h1:clamp(1.25rem,1.1rem + .8vw,1.75rem);
  --fs-h2:clamp(1.0625rem,1rem + .4vw,1.3125rem);
  --fs-lede:clamp(1rem,.95rem + .5vw,1.25rem);

  box-sizing:border-box;
  padding-top:env(safe-area-inset-top,0px);
  padding-bottom:env(safe-area-inset-bottom,0px);
  padding-left:env(safe-area-inset-left,0px);
  padding-right:env(safe-area-inset-right,0px);
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){--bg:#0f1713;--card:#17231c;--ink:#eaf1ec;--text:#aebdb3;--line:#26352c;--green:#4cc78a;--focus:#4cc78a}
}
:root[data-theme="dark"]{--bg:#0f1713;--card:#17231c;--ink:#eaf1ec;--text:#aebdb3;--line:#26352c;--green:#4cc78a;--focus:#4cc78a}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-padding-top:env(safe-area-inset-top,0px)}
body{margin:0;min-width:320px;background:var(--bg);color:var(--text);font-family:var(--font);font-size:var(--fs-body);line-height:1.6;overflow-x:hidden;overflow-wrap:anywhere}
a{color:var(--green);text-underline-offset:2px}
:focus-visible{outline:3px solid var(--focus);outline-offset:3px;border-radius:6px}

/* Header: back arrow + page title */
body::before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top,0px);background:var(--bg);z-index:10}
header{position:sticky;top:env(safe-area-inset-top,0px);z-index:5;background:var(--bg)}
.bar{display:flex;align-items:center;gap:clamp(.75rem,3vw,1.25rem);max-width:50rem;margin:0 auto;padding:clamp(.85rem,2.5vw,1.5rem) var(--gutter)}
.back{flex:none;display:inline-flex;align-items:center;justify-content:center;width:2.75rem;height:2.75rem;margin:-.4rem;padding:0;border:0;border-radius:50%;background:none;color:var(--ink);cursor:pointer;-webkit-tap-highlight-color:transparent}
.back:hover{background:var(--line)}
.back[hidden]{display:none}
h1{margin:0;font-size:var(--fs-h1);line-height:1.2;font-weight:700;letter-spacing:-.01em;color:var(--ink)}

/* Content column */
main{max-width:50rem;margin:0 auto;padding:clamp(.75rem,2.5vw,2rem) var(--gutter) 2rem}
.updated{margin:0 0 .6rem;font-size:.8125rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--green)}
.lede{margin:0 0 1.4rem;font-size:var(--fs-lede);line-height:1.5;color:var(--text)}

/* Cards */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:var(--card-pad-y) var(--card-pad-x);margin:0 0 clamp(.75rem,2.5vw,1.1rem)}
h2{margin:0 0 .5rem;font-size:var(--fs-h2);line-height:1.3;font-weight:700;color:var(--ink)}
.card p{margin:0 0 .7rem;font-size:1em}
.card p:last-child,.card ul:last-child{margin-bottom:0}
.card ul{list-style:none;margin:0 0 .7rem;padding:0}
.card li{position:relative;padding-left:1.15rem;margin:0 0 .4rem}
.card li::before{content:"";position:absolute;left:.15rem;top:.6em;width:.4rem;height:.4rem;border-radius:50%;background:var(--green)}

.hidden{display:none}

/* Footer */
footer{max-width:50rem;margin:0 auto;padding:0 var(--gutter) 2.5rem;font-size:.875rem;display:flex;justify-content:space-between;align-items:center;gap:.75rem 1.25rem;flex-wrap:wrap}
footer nav{display:flex;flex-wrap:wrap;gap:.25rem 1.25rem}
footer a{display:inline-block;padding:.5rem 0}
footer nav a[aria-current="page"]{color:var(--ink);font-weight:600;text-decoration:none}

/* Small phones: stack footer, keep tap targets comfortable */
@media (max-width:479px){
  footer{flex-direction:column;align-items:flex-start}
  .updated{font-size:.75rem}
}

/* Landscape phones: keep the sticky header compact */
@media (max-height:500px) and (orientation:landscape){
  .bar{padding-top:.5rem;padding-bottom:.5rem}
  header{position:static}
}

/* Large screens: a little more room to breathe */
@media (min-width:1200px){
  .bar,main,footer{max-width:54rem}
}

@media (prefers-reduced-motion:no-preference){
  .back{transition:background-color .15s ease}
}

@media print{
  header,footer,body::before{display:none}
  :root{padding:0}
  body{background:#fff;color:#000}
  .card{break-inside:avoid;border-color:#ccc}
}