:root {
  --bg: #10161d;
  --bg-raise: #18222d;
  --ink: #e8eef5;
  --muted: #b7c6d6;
  --line: #314556;
  --accent: #f0c14d;
  --accent-ink: #1a1404;
  --link: #9dc7ff;
  --good: #8fd4b0;
  --warn: #f0c14d;
  --bad: #ffb4ab;
  --code: #0c1218;
  --max: 1080px;
  --font: "Source Sans 3", "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--ink);
  font-size: 18px;
  line-height: 1.65;
}
a { color: var(--link); }
a:hover { color: #d6e7ff; }
.skip {
  position: absolute;
  left: 12px;
  top: -40px;
  background: var(--accent);
  color: var(--accent-ink);
  padding: 8px 12px;
  z-index: 5;
}
.skip:focus { top: 8px; }
.wrap { width: min(var(--max), calc(100% - 32px)); margin: 0 auto; }
header {
  border-bottom: 1px solid var(--line);
  background: #0c1218;
}
.nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 16px;
  padding: 14px 0;
}
.brand {
  color: var(--ink);
  text-decoration: none;
  font-weight: 800;
  letter-spacing: 0.01em;
  margin-right: auto;
}
.brand span { color: var(--accent); }
header nav { display: flex; flex-wrap: wrap; gap: 8px 14px; }
header nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 16px;
  padding: 8px 2px;
  display: inline-block;
}
header nav a[aria-current="page"] { color: var(--accent); }
.kicker {
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin: 0 0 8px;
}
h1 { font-size: clamp(32px, 5vw, 46px); line-height: 1.15; margin: 0 0 12px; }
h2 { font-size: 28px; line-height: 1.25; margin: 36px 0 10px; }
h3 { font-size: 22px; line-height: 1.3; margin: 26px 0 8px; }
.lead { color: var(--muted); font-size: 20px; max-width: 68ch; }
.prose { max-width: 74ch; overflow-wrap: anywhere; }
.prose p, .prose li { margin: 0 0 12px; }
.prose ul, .prose ol { padding-left: 1.2em; }
.hero { padding: 36px 0 10px; }
.grid { display: grid; gap: 14px; }
.cols-2 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.cols-3 { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.card {
  background: var(--bg-raise);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 16px 18px;
}
.card h2, .card h3 { margin-top: 0; }
.card a.more { font-weight: 700; }
.tag {
  display: inline-block;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 2px 8px;
  font-size: 13px;
  color: var(--muted);
  margin: 0 6px 6px 0;
}
.callout {
  border-left: 3px solid var(--accent);
  background: #221c10;
  padding: 12px 14px;
  margin: 16px 0;
  border-radius: 0 10px 10px 0;
}
.callout.good { border-left-color: var(--good); background: #12241c; }
.callout.warn { border-left-color: var(--bad); background: #2a1716; }
pre {
  background: var(--code);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 12px 14px;
  overflow-x: auto;
  max-width: 100%;
  font-family: var(--mono);
  font-size: 14px;
  line-height: 1.5;
}
code { font-family: var(--mono); font-size: 0.92em; }
p code, li code { background: #0c1218; padding: 0 4px; border-radius: 4px; }
.layout { display: block; }
.toc {
  background: var(--bg-raise);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px 14px;
  margin: 18px 0;
}
.toc ol { margin: 8px 0 0; padding-left: 1.2em; }
.toc a { text-decoration: none; }
.toc li { margin: 0; }
@media (max-width: 640px) {
  .toc a { display: block; padding: 12px 4px; }
}

.pager {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: space-between;
  margin: 28px 0;
}
.pager a {
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px 12px;
  min-width: 44%;
}
footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 15px;
  padding: 22px 0 40px;
  margin-top: 20px;
}
footer a { color: var(--muted); }
@media (min-width: 960px) {
  .with-toc { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 28px; align-items: start; }
  .toc { position: sticky; top: 12px; margin-top: 0; }
}
@media (max-width: 640px) {
  body { font-size: 17px; }
  .wrap { width: min(var(--max), calc(100% - 20px)); }
  .nav { flex-direction: row; align-items: center; }
  header nav { width: auto; }
  h1 { font-size: clamp(28px, 8vw, 40px); }
  pre { font-size: 14px; padding: 10px; }
  .pager a { min-width: 100%; }
  .toc { font-size: 16px; }
}

.modebar { display: flex; flex-wrap: wrap; gap: 8px; margin: 16px 0 8px; }
.modebtn {
  font: inherit;
  font-weight: 700;
  font-size: 16px;
  background: var(--bg-raise);
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 10px 16px;
  min-height: 44px;
  cursor: pointer;
}
.modebtn[aria-selected="true"] { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.modebtn:focus-visible, a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.modehint { color: var(--muted); margin: 0 0 12px; max-width: 74ch; }
.figure { margin: 8px 0 18px; }
.figure h2 { font-size: 22px; margin: 12px 0 8px; }
.figure svg { width: 100%; height: auto; display: block; background: #0c1218; border: 1px solid var(--line); border-radius: 12px; }
.figure figcaption { color: var(--muted); font-size: 16px; margin-top: 8px; max-width: 74ch; }

.cta {
  display: inline-block;
  background: var(--accent);
  color: var(--accent-ink);
  font-weight: 800;
  text-decoration: none;
  border-radius: 10px;
  padding: 12px 18px;
  margin: 14px 0 4px;
  min-height: 44px;
}
.cta:hover { color: var(--accent-ink); }
.labbox {
  border: 2px solid var(--accent);
  background: #221c10;
  border-radius: 14px;
  padding: 16px 18px;
  margin: 18px 0 22px;
}
.labbox h2 { margin-top: 0; }
.labbox ul { columns: 1; }
@media (min-width: 800px) {
  .labbox ul { columns: 2; }
}
header nav a.done { color: var(--good); }
header nav a.done[aria-current="page"] { color: var(--accent); }
.done-mark { color: var(--good); font-weight: 800; }
.progress-row { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 14px; margin: 18px 0; }
.mark-complete {
  font: inherit;
  font-weight: 700;
  font-size: 16px;
  background: var(--bg-raise);
  color: var(--ink);
  border: 1px solid var(--good);
  border-radius: 10px;
  padding: 10px 16px;
  min-height: 44px;
  cursor: pointer;
}
.mark-complete[aria-pressed="true"] { background: #12241c; color: var(--good); }
.progress-note { color: var(--muted); margin: 0; font-size: 16px; }

.affili {
  margin: 0;
  padding: 0 0 12px;
  color: var(--accent);
  font-size: 15px;
  font-weight: 700;
}
.weeks-menu { position: relative; }
.weeks-menu summary {
  cursor: pointer;
  color: var(--muted);
  font-size: 16px;
  padding: 8px 2px;
  min-height: 44px;
  list-style: none;
}
.weeks-menu summary::-webkit-details-marker { display: none; }
.week-links { display: flex; flex-wrap: wrap; gap: 8px 14px; align-items: center; }
.pull {
  border-left: 3px solid var(--accent);
  margin: 16px 0;
  padding: 4px 14px;
  color: var(--ink);
  font-size: 22px;
  line-height: 1.35;
}
.pull p { margin: 0; }
.pull cite { display: block; color: var(--muted); font-size: 16px; font-style: normal; margin-top: 8px; }
@media (min-width: 860px) {
  .weeks-menu > summary { display: none; }
  .weeks-menu > .week-links { display: flex !important; }
  /* Newer Chrome hides closed <details> content via ::details-content; keep the week row visible on desktop. */
  .weeks-menu::details-content { content-visibility: visible; display: contents; }
}
@media (max-width: 859px) {
  .nav { flex-direction: row; align-items: center; }
  header nav { width: auto; margin-left: auto; }
  .weeks-menu > .week-links {
    display: none;
    position: absolute;
    right: 0;
    top: calc(100% + 4px);
    z-index: 4;
    background: #0c1218;
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 8px;
    min-width: 220px;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }
  .weeks-menu[open] > .week-links { display: flex; }
  .week-links a { display: block; padding: 10px 12px; }
}

/* Second nav row: site pages (Cases, Interview, Advanced, What is an FDE, Portfolio policy). */
header nav.site-links { gap: 2px 16px; padding: 0 0 8px; margin-top: -6px; }
header nav.site-links a { font-size: 15px; padding: 6px 2px; min-height: 32px; }
header nav a[aria-current="true"] { color: var(--accent); }
@media (max-width: 640px) {
  header nav.site-links { gap: 0 14px; }
  header nav.site-links a { padding: 8px 2px; min-height: 40px; }
}
/* Short portfolio-policy component that replaces repeated disclaimer paragraphs. */
.policy-note { color: var(--muted); font-size: 16px; }
.policy-note a { font-weight: 700; }
.reviewed { color: var(--muted); font-size: 15px; border-top: 1px solid var(--line); padding-top: 10px; }
.breadcrumb { font-size: 15px; color: var(--muted); margin: 18px 0 4px; }
.breadcrumb ol { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 6px; }
.breadcrumb li + li::before { content: "→ "; color: var(--muted); }
table.frame { border-collapse: collapse; width: 100%; margin: 12px 0 18px; font-size: 16px; }
table.frame th, table.frame td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; vertical-align: top; }
table.frame th { background: var(--bg-raise); width: 30%; }
.quiz fieldset { border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; margin: 0 0 14px; }
.quiz legend { font-weight: 700; padding: 0 6px; }
.quiz label { display: block; padding: 6px 0; min-height: 36px; }
.quiz button { font: inherit; font-weight: 700; background: var(--accent); color: var(--accent-ink); border: 0; border-radius: 10px; padding: 12px 18px; min-height: 44px; cursor: pointer; }
.quiz-result { margin-top: 16px; }