:root{
  --paper: #eef2f1;
  --paper-raised: #ffffff;
  --paper-sunken: #e3e9e7;
  --ink: #1b3a4b;
  --ink-soft: #45606b;
  --brass: #9c6e26;
  --brass-deep: #7a5518;
  --brass-bg: #f4e7cd;
  --teal: #2f6b63;
  --teal-bg: #dbe9e5;
  --rust: #a3421f;
  --rust-bg: #f5ddd1;
  --line: #c9d3d1;
  --shadow: 0 1px 2px rgba(27,58,75,.06), 0 6px 20px rgba(27,58,75,.07);
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --paper: #12211f;
    --paper-raised: #1b2f2c;
    --paper-sunken: #0d1a18;
    --ink: #e9efec;
    --ink-soft: #a9c1bb;
    --brass: #e0b466;
    --brass-deep: #f0c987;
    --brass-bg: #33291a;
    --teal: #7fc2b4;
    --teal-bg: #1c3733;
    --rust: #e28a63;
    --rust-bg: #3a2418;
    --line: #2c433f;
    --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.35);
  }
}
:root[data-theme="dark"]{
  --paper: #12211f;
  --paper-raised: #1b2f2c;
  --paper-sunken: #0d1a18;
  --ink: #e9efec;
  --ink-soft: #a9c1bb;
  --brass: #e0b466;
  --brass-deep: #f0c987;
  --brass-bg: #33291a;
  --teal: #7fc2b4;
  --teal-bg: #1c3733;
  --rust: #e28a63;
  --rust-bg: #3a2418;
  --line: #2c433f;
  --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.35);
}

*{ box-sizing:border-box; }
/* Scale the ROOT font-size, not just body's — every rem-sized element on the
   page (headings, nav chips, glossary, footer) is anchored to html's font-size,
   so A+/A- has to move that, or only plain paragraph text without its own
   font-size ever grows. */
html{
  font-size:calc(16px * var(--scale,1));
  -webkit-text-size-adjust:100%;
}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:'Atkinson Hyperlegible','Segoe UI',Arial,sans-serif;
  font-size:1.0625rem; /* 17px at scale 1 */
  line-height:1.65;
  text-rendering:optimizeLegibility;
}
/* Bigger baseline on phones by default — not everything should depend on the A+ button */
@media (max-width:600px){
  body{ font-size:1.1875rem; } /* 19px at scale 1 */
}

h1,h2,h3{ font-family:'Newsreader',Georgia,serif; text-wrap:balance; color:var(--ink); margin:0; }
a{ color:var(--brass-deep); text-underline-offset:3px; }
a:hover{ color:var(--brass); }
:focus-visible{ outline:3px solid var(--teal); outline-offset:2px; }

.container{ max-width:840px; }

/* --- hero --- */
.hero{ padding:48px 0 32px; }
.eyebrow{ display:inline-block; font-size:.78rem; font-weight:700; letter-spacing:.08em; text-transform:uppercase; color:var(--teal); margin-bottom:14px; }
.hero h1{ font-size:clamp(2.1rem,7vw,3.4rem); font-weight:700; }
.hero .lede{ margin-top:16px; font-size:1.1rem; color:var(--ink-soft); max-width:60ch; }
.compass{ width:120px; height:120px; }
@media (max-width:767px){ .compass{ width:84px; height:84px; } }

/* --- chapter nav chips --- */
.chapternav{ display:flex; flex-wrap:wrap; gap:8px; margin:28px 0 0; padding:0; list-style:none; }
.chapternav a{
  display:inline-flex; align-items:center; gap:6px;
  padding:9px 14px; border-radius:999px; border:1px solid var(--line);
  background:var(--paper-raised); color:var(--ink); text-decoration:none; font-size:.92rem;
  box-shadow:var(--shadow);
}
.chapternav a:hover{ border-color:var(--brass); }
.chapternav b{ color:var(--brass-deep); font-family:'Newsreader',serif; }

/* --- chapters --- */
main{ padding-bottom:20px; }
.chapter{ padding:44px 0; border-top:1px solid var(--line); scroll-margin-top:24px; }
.chapter-head{ display:flex; gap:16px; align-items:flex-start; margin-bottom:20px; }
.chapter-icon{ flex:none; width:50px; height:50px; border-radius:14px; background:var(--teal-bg); display:flex; align-items:center; justify-content:center; }
.chapter-icon svg{ width:26px; height:26px; }
.chapter-num{ font-size:.78rem; font-weight:700; letter-spacing:.08em; text-transform:uppercase; color:var(--teal); }
.chapter h2{ font-size:1.5rem; margin-top:2px; }
.chapter .intro{ font-size:1.02rem; color:var(--ink-soft); max-width:66ch; margin:0 0 22px; font-style:italic; font-family:'Newsreader',serif; }

.tips{ list-style:none; margin:0; padding:0; display:flex; flex-direction:column; gap:12px; }
.tips li{ display:grid; grid-template-columns:32px 1fr; gap:12px; background:var(--paper-raised); border:1px solid var(--line); border-radius:12px; padding:14px 16px; box-shadow:var(--shadow); scroll-margin-top:16px; }
.tips li .n{ font-family:'Newsreader',serif; font-weight:600; color:var(--brass-deep); font-size:1.1rem; line-height:1; }
.tips li p{ margin:0; }
.tips li strong{ color:var(--ink); }

.callout{ margin-top:16px; padding:16px 18px; border-radius:12px; background:var(--rust-bg); border:1px solid color-mix(in srgb, var(--rust) 35%, var(--line)); display:flex; gap:12px; align-items:flex-start; scroll-margin-top:16px; }
.callout svg{ flex:none; width:24px; height:24px; margin-top:2px; }
.callout strong{ display:block; color:var(--rust); font-family:'Newsreader',serif; font-size:1.02rem; margin-bottom:4px; }
.callout p{ margin:0; }

.goldrule{ margin-top:20px; padding:16px 18px; border-radius:12px; background:var(--brass-bg); border:1px solid color-mix(in srgb, var(--brass) 35%, var(--line)); scroll-margin-top:16px; }
.goldrule strong{ font-family:'Newsreader',serif; color:var(--brass-deep); }

/* --- glossary --- */
.glossary{ padding:44px 0 16px; border-top:1px solid var(--line); scroll-margin-top:24px; }
.glossary dl{ margin:20px 0 0; display:flex; flex-direction:column; }
.glossary > dl > div{ padding:14px 0; border-bottom:1px solid var(--line); display:grid; grid-template-columns:minmax(130px,170px) 1fr; gap:16px; scroll-margin-top:16px; }
.glossary dt{ font-family:'Newsreader',serif; font-weight:600; color:var(--teal); }
.glossary dd{ margin:0; color:var(--ink-soft); }
@media (max-width:600px){ .glossary > dl > div{ grid-template-columns:1fr; gap:4px; } }

footer{ padding:36px 0 100px; border-top:1px solid var(--line); }
footer p{ color:var(--ink-soft); max-width:60ch; font-family:'Newsreader',serif; font-size:1.05rem; font-style:italic; }
.backtotop{ display:inline-block; margin-top:12px; font-size:.85rem; }

/* --- floating font-size control: fixed to the viewport, always reachable --- */
.fontctl-fab{
  position:fixed; right:18px; bottom:18px; z-index:1050;
  width:52px; height:52px; border-radius:50%;
  background:var(--brass-deep); color:#fff; border:none;
  font-family:'Newsreader',serif; font-weight:700; font-size:1.15rem;
  box-shadow:0 6px 18px rgba(0,0,0,.25);
  cursor:pointer;
}
.fontctl-fab:hover{ background:var(--brass); }
.fontctl-panel{
  position:fixed; right:18px; bottom:80px; z-index:1050;
  background:var(--paper-raised); border:1px solid var(--line); border-radius:14px;
  padding:12px 14px; box-shadow:0 10px 30px rgba(0,0,0,.2);
  display:flex; flex-direction:column; gap:8px; min-width:170px;
}
.fontctl-label{ font-size:.8rem; color:var(--ink-soft); font-weight:700; text-transform:uppercase; letter-spacing:.05em; }
.fontctl-buttons{ display:flex; gap:8px; }
.fontctl-buttons button{
  flex:1; height:40px; border-radius:8px; border:1px solid var(--line);
  background:var(--paper); color:var(--ink); font-family:inherit; font-weight:700; font-size:1rem;
  cursor:pointer;
}
.fontctl-buttons button:hover{ border-color:var(--brass); color:var(--brass-deep); }

@media (max-width:480px){
  .fontctl-fab{ width:56px; height:56px; right:14px; bottom:14px; font-size:1.25rem; }
  .fontctl-panel{ right:14px; bottom:82px; }
}