/* Project HOUSE - static edition. Optimized for monochrome e-ink and Kindle browser. */
:root{
  color-scheme: light;
  --paper:#ffffff;
  --ink:#111111;
  --muted:#3a3a3a;
  --line:#999999;
  --accent:#0b3d5c;
}
*{box-sizing:border-box}
html{background:var(--paper);color:var(--ink);-webkit-text-size-adjust:100%}
body{
  margin:0;
  font-family:Georgia,'Times New Roman','Noto Serif',serif;
  font-size:1.05rem;
  line-height:1.65;
  color:var(--ink);
  background:var(--paper);
}
a{color:var(--accent);text-decoration:underline;text-underline-offset:2px}
a:hover{color:#000}
.skip{position:absolute;left:-9999px;top:0}
.skip:focus{position:static;display:block;padding:.5rem 1rem;background:var(--ink);color:#fff}

.wrap{max-width:46rem;margin:0 auto;padding:1.5rem 1.25rem 4rem}

.site-nav{
  border:1px solid var(--line);
  border-radius:8px;
  padding:.75rem 1rem;
  margin-bottom:2rem;
  background:#fafafa;
}
.site-nav .brand{font-family:ui-sans-serif,system-ui,-apple-system,'Segoe UI',Arial,sans-serif;font-weight:700;font-size:1.05rem;margin:0 0 .5rem}
.site-nav .brand span{font-weight:400;color:var(--muted)}
.site-nav ul{list-style:none;margin:0;padding:0}
.site-nav li{display:inline-block;margin:.15rem .35rem .15rem 0}
.site-nav .label{font-family:ui-sans-serif,system-ui,-apple-system,'Segoe UI',Arial,sans-serif;font-size:.72rem;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);display:block;margin-top:.35rem}
.site-nav a{text-decoration:none;font-family:ui-sans-serif,system-ui,-apple-system,'Segoe UI',Arial,sans-serif;font-size:.92rem}
.site-nav .label:first-child{margin-top:0}

h1,h2,h3,h4{line-height:1.25;margin:0 0 .6rem;font-family:ui-sans-serif,system-ui,-apple-system,'Segoe UI',Arial,sans-serif}
h1{font-size:1.9rem}
h2{font-size:1.45rem;margin-top:1.4rem}
h3{font-size:1.18rem}
h4{font-size:1.05rem}
p{margin:0 0 1rem}
ul,ol{margin:.3rem 0 1rem;padding-left:1.4rem}
li{margin-bottom:.25rem}

.eyebrow{font-family:ui-sans-serif,system-ui,-apple-system,'Segoe UI',Arial,sans-serif;font-size:.78rem;text-transform:uppercase;letter-spacing:.08em;color:var(--accent);margin-bottom:.35rem}
.tagline{font-size:1.1rem;color:var(--muted);font-style:italic}
.meta{font-family:ui-sans-serif,system-ui,-apple-system,'Segoe UI',Arial,sans-serif;font-size:.85rem;color:var(--muted)}

/* Chapter / section blocks */
.chapter{border-top:2px solid var(--ink);margin-top:2.6rem;padding-top:1.4rem}
.chapter .chap-head{display:flex;flex-direction:column;gap:.15rem;margin-bottom:1.1rem}
.chapter h2 .num{font-family:ui-sans-serif,system-ui,-apple-system,'Segoe UI',Arial,sans-serif;color:var(--muted);font-size:.75em}
.chapter .summary{color:var(--muted);font-style:italic;margin:0}

.toc{border:1px solid var(--line);border-radius:8px;padding:1rem 1.25rem;margin:1.2rem 0 2rem;background:#fafafa}
.toc h2{font-size:1.05rem;margin:0 0 .5rem}
.toc ol{margin:0;padding-left:1.3rem}
.toc li{margin-bottom:.15rem}

.objectives{border:1px solid var(--line);border-left:6px solid var(--accent);border-radius:6px;padding:.9rem 1.2rem 1rem;background:#fafafa}
.objectives h4{margin:0 0 .4rem;font-size:.8rem;text-transform:uppercase;letter-spacing:.06em;color:var(--accent)}

.callout{border:1px solid var(--line);border-left:6px solid #555;border-radius:6px;padding:.9rem 1.2rem 1rem;margin:1rem 0;background:#f7f7f7}
.callout h4{margin:0 0 .4rem;font-size:.78rem;text-transform:uppercase;letter-spacing:.06em;color:#333}
.callout.warn{border-left-color:#000}

.concept{display:inline;color:var(--accent)}
details.concept{display:inline-block;vertical-align:baseline}
details.concept>summary{display:inline;cursor:pointer;font-weight:700;text-decoration:underline dotted;color:var(--accent)}
details.concept[open] .def{display:block;margin-top:.4rem;font-family:Georgia,serif}

details.mech{border:1px solid var(--line);border-radius:8px;margin:1.1rem 0;background:#fafafa}
details.mech>summary{cursor:pointer;padding:.7rem 1rem;font-family:ui-sans-serif,system-ui,-apple-system,'Segoe UI',Arial,sans-serif;font-weight:600}
details.mech .mech-body{padding:.2rem 1.2rem 1rem;border-top:1px solid var(--line)}
.flow{font-family:ui-sans-serif,system-ui,-apple-system,'Segoe UI',Arial,sans-serif;font-size:.95rem}
.flow .step{display:block;margin:.15rem 0}

details.case{border:1px solid var(--line);border-radius:8px;margin:1rem 0;background:#fafafa}
details.case>summary{cursor:pointer;padding:.75rem 1rem}
details.case .case-body{padding:.2rem 1.2rem 1.1rem;border-top:1px solid var(--line)}

details.check{border:1px solid var(--line);border-radius:8px;margin:1.1rem 0;background:#fafafa}
details.check>summary{cursor:pointer;padding:.7rem 1rem;font-family:ui-sans-serif,system-ui,-apple-system,'Segoe UI',Arial,sans-serif;font-weight:600}
details.check .q{padding:.4rem 1.2rem 1.1rem}

details.panel{border:1px solid var(--line);border-radius:8px;margin:.9rem 0;background:#fafafa}
details.panel>summary{cursor:pointer;padding:.7rem 1rem;font-family:ui-sans-serif,system-ui,-apple-system,'Segoe UI',Arial,sans-serif;font-weight:600}
details.panel .panel-body{padding:.2rem 1.2rem 1rem;border-top:1px solid var(--line)}

/* tables */
.tablewrap{overflow-x:auto;margin:1rem 0}
table{border-collapse:collapse;width:100%;font-size:.98rem}
th,td{border:1px solid #666;padding:.45rem .6rem;text-align:left;vertical-align:top}
th{background:#f0f0f0;font-family:ui-sans-serif,system-ui,-apple-system,'Segoe UI',Arial,sans-serif;font-size:.85rem}
tbody tr:nth-child(even) td{background:#fafafa}

.optionlist{list-style:lower-alpha;margin:.4rem 0 .6rem}
.answer{font-weight:700}
.explain{margin-top:.4rem}

.case-notes{border-top:1px dotted var(--line);margin-top:.7rem;padding-top:.6rem;font-size:.95rem}
.case-notes h5{margin:.7rem 0 .25rem;font-family:ui-sans-serif,system-ui,-apple-system,'Segoe UI',Arial,sans-serif;font-size:.82rem;text-transform:uppercase;letter-spacing:.05em;color:#333}

.gloss-list{list-style:none;padding:0;margin:0}
.gloss-list>li{margin-bottom:.35rem}
.gloss-term{font-weight:700}

.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}