/* Layout: a guidebook — fixed section index on the left, one readable column on the right.
   Motif: Hook / Impact / Depth, drawn as three stepped rules. */
:root {
  --paper: #f3f5f4;
  --surface: #ffffff;
  --ink: #15201e;
  --ink-soft: #4a5753;
  --rule: #d5ddda;
  --accent: #0d6b5a;      /* ledger green */
  --accent-ink: #ffffff;
  --mark: #c98a14;        /* margin-note amber */
  --tint: #e3eeea;
  --before: #2a4170;
  --brand: #0d6b5a;
  --before-tint: #e8ecf5;
  --font-display: "Bricolage Grotesque", "Avenir Next", "Segoe UI", system-ui, sans-serif;
  --font-body: "Source Serif 4", Georgia, "Times New Roman", serif;
  --font-util: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
  --measure: 66ch;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #0f1615; --surface: #162120; --ink: #e6ecea; --ink-soft: #a5b3af;
    --rule: #2a3735; --accent: #4fc3a8; --accent-ink: #08201b; --mark: #e7b34f; --tint: #1a2d29;
    --before: #93aee6; --before-tint: #1b2336; --brand: #4fc3a8;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #0f1615; --surface: #162120; --ink: #e6ecea; --ink-soft: #a5b3af;
  --rule: #2a3735; --accent: #4fc3a8; --accent-ink: #08201b; --mark: #e7b34f; --tint: #1a2d29;
  --before: #93aee6; --before-tint: #1b2336; --brand: #4fc3a8;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font-family: var(--font-body); font-size: 1.125rem; line-height: 1.65;
}
a { color: var(--accent); text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--mark); outline-offset: 2px; }

/* Top bar */
.topbar {
  position: sticky; top: env(safe-area-inset-top, 0px); z-index: 10;
  background: var(--paper); border-bottom: 1px solid var(--rule);
  padding-inline: 16px;
}
.topbar-inner { max-width: 1180px; margin: 0 auto; display: flex; align-items: center; gap: 16px; min-height: 60px; flex-wrap: wrap; }
.brand { display: flex; align-items: baseline; gap: 10px; text-decoration: none; color: var(--ink); flex-wrap: wrap; }
.brand-name { font-family: var(--font-display); font-weight: 700; font-size: 1.3rem; letter-spacing: -0.01em; }
.brand-name span { color: var(--brand); }
.brand-by { font-family: var(--font-util); font-size: 0.75rem; color: var(--ink-soft); letter-spacing: 0.04em; }
.topnav { margin-left: auto; display: flex; gap: 18px; font-family: var(--font-display); font-size: 0.95rem; }
.topnav a { color: var(--ink); text-decoration: none; }
.topnav a:hover { color: var(--accent); }
.topnav .cta { background: var(--accent); color: var(--accent-ink); padding: 6px 14px; border-radius: 4px; }
.topnav .cta:hover { color: var(--accent-ink); filter: brightness(1.08); }

/* Shell */
.shell { max-width: 1180px; margin: 0 auto; padding-inline: 16px; padding-block: 32px 64px; display: grid; grid-template-columns: 260px minmax(0, 1fr); gap: 56px; }
.sidenav { position: sticky; top: 84px; align-self: start; max-height: calc(100vh - 100px); overflow-y: auto; font-family: var(--font-display); font-size: 0.92rem; }
.sidenav h2 { font-family: var(--font-util); font-size: 0.7rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-soft); margin: 22px 0 6px; font-weight: 500; }
.sidenav h2:first-child { margin-top: 0; }
.sidenav ol { list-style: none; margin: 0; padding: 0; display: grid; gap: 2px; }
.sidenav a { display: block; padding: 4px 10px; color: var(--ink); text-decoration: none; border-left: 2px solid transparent; line-height: 1.35; }
.sidenav a:hover { color: var(--accent); }
.sidenav a[aria-current="page"] { border-left-color: var(--accent); color: var(--accent); font-weight: 600; background: var(--tint); }
.mobilenav { display: none; }

/* Article */
article { min-width: 0; max-width: var(--measure); }
.eyebrow { font-family: var(--font-util); font-size: 0.75rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--accent); margin: 0 0 10px; }
h1, h2, h3, h4 { font-family: var(--font-display); line-height: 1.15; text-wrap: balance; letter-spacing: -0.015em; }
h1 { font-size: clamp(2.1rem, 4.5vw, 3rem); margin: 0 0 14px; font-weight: 700; }
h2 { font-size: 1.6rem; margin: 2.4em 0 0.6em; font-weight: 650; }
h3 { font-size: 1.22rem; margin: 1.8em 0 0.4em; font-weight: 650; }
h4 { font-size: 1.02rem; margin: 1.4em 0 0.3em; font-weight: 650; }
.lede { font-size: 1.28rem; line-height: 1.55; color: var(--ink-soft); margin: 0 0 8px; }
.meta { font-family: var(--font-util); font-size: 0.78rem; color: var(--ink-soft); margin: 18px 0 0; padding-bottom: 22px; border-bottom: 1px solid var(--rule); }
article p { margin: 0 0 1.05em; }
article ul, article ol { padding-left: 1.3em; margin: 0 0 1.1em; }
article li { margin-bottom: 0.4em; }
strong { font-weight: 650; }

/* Story: Marc's coaching stories */
.story { margin: 1.8em 0; padding: 20px 24px; background: var(--surface); border: 1px solid var(--rule); border-radius: 6px; }
.story .label { font-family: var(--font-util); font-size: 0.72rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--mark); margin: 0 0 8px; }
.story p:last-child { margin-bottom: 0; }

/* Before / after */
.compare { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 14px; margin: 1.4em 0 1.8em; }
.compare > div { min-width: 0; padding: 16px 18px; border-radius: 6px; border: 1px solid var(--rule); background: var(--surface); font-size: 1.02rem; }
.compare .tag { font-family: var(--font-util); font-size: 0.7rem; letter-spacing: 0.1em; text-transform: uppercase; margin: 0 0 6px; display: block; }
.compare .weak .tag { color: var(--ink-soft); }
.compare .strong { border-color: var(--accent); }
.compare .strong .tag { color: var(--accent); }
.compare p { margin: 0; }

/* Question bank */
.qbank { margin: 1.2em 0 2em; display: grid; gap: 0; border-top: 1px solid var(--rule); }
.q { padding: 18px 0; border-bottom: 1px solid var(--rule); }
.q h4 { margin: 0 0 8px; font-size: 1.06rem; }
.q h4 .n { font-family: var(--font-util); font-size: 0.78rem; color: var(--accent); margin-right: 8px; font-weight: 500; }
.q p { margin: 0 0 0.5em; font-size: 1.02rem; }
.q p:last-child { margin-bottom: 0; }
.q .k { font-family: var(--font-util); font-size: 0.72rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-soft); margin-right: 6px; }

/* Layers motif */
.layers { margin: 1.6em 0 2em; display: grid; gap: 10px; }
.layer { display: grid; grid-template-columns: 112px minmax(0, 1fr); gap: 16px; align-items: baseline; padding: 14px 18px; background: var(--surface); border: 1px solid var(--rule); border-radius: 6px; }
.layer:nth-child(2) { margin-left: 24px; }
.layer:nth-child(3) { margin-left: 48px; }
.layer b { font-family: var(--font-display); color: var(--accent); }
.layer span.t { font-family: var(--font-util); font-size: 0.75rem; color: var(--ink-soft); display: block; }
.layer p { margin: 0; font-size: 1.02rem; }

/* Tables */
.table-wrap { overflow-x: auto; margin: 1.2em 0 1.8em; }
table { border-collapse: collapse; width: 100%; font-size: 0.98rem; font-variant-numeric: tabular-nums; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--rule); vertical-align: top; }
th { font-family: var(--font-display); font-weight: 650; background: var(--tint); }

pre { background: var(--surface); border: 1px solid var(--rule); border-radius: 6px; padding: 14px 16px; overflow-x: auto; font-family: var(--font-util); font-size: 0.86rem; line-height: 1.5; }
code { font-family: var(--font-util); font-size: 0.9em; }

.note { border-left: 3px solid var(--mark); padding: 4px 0 4px 16px; margin: 1.6em 0; color: var(--ink-soft); font-size: 1.02rem; }

/* Pager */
.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 56px; padding-top: 24px; border-top: 1px solid var(--rule); font-family: var(--font-display); }
.pager a { text-decoration: none; color: var(--ink); padding: 12px 16px; border: 1px solid var(--rule); border-radius: 6px; background: var(--surface); }
.pager a:hover { border-color: var(--accent); }
.pager small { display: block; font-family: var(--font-util); font-size: 0.7rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-soft); }
.pager .next { text-align: right; grid-column: 2; }

/* Home */
.hero { padding-block: 8px 8px; }
.hero h1 { font-size: clamp(2.4rem, 6vw, 4rem); line-height: 1.02; letter-spacing: -0.03em; }
.hero h1 em { font-style: normal; color: var(--accent); }
.years { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; margin: 1.4em 0 2em; }
.years a { display: block; text-decoration: none; color: var(--ink); background: var(--surface); border: 1px solid var(--rule); border-radius: 6px; padding: 14px 16px; }
.years a:hover { border-color: var(--accent); }
.years b { font-family: var(--font-display); font-size: 1.1rem; display: block; }
.years span { font-size: 0.95rem; color: var(--ink-soft); }
.sections { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 12px; margin: 1em 0 2em; }
.sections div { min-width: 0; padding: 16px 18px; border-top: 2px solid var(--accent); background: var(--surface); }
.sections h3 { margin: 0 0 6px; font-size: 1.08rem; }
.sections p { margin: 0 0 8px; font-size: 0.98rem; color: var(--ink-soft); }
.sections ul { list-style: none; padding: 0; margin: 0; font-family: var(--font-display); font-size: 0.92rem; }
.sections li { margin: 3px 0; }

/* Services */
.services { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 14px; margin: 1.2em 0 2em; }
.service { min-width: 0; padding: 18px 20px; background: var(--surface); border: 1px solid var(--rule); border-radius: 6px; display: flex; flex-direction: column; gap: 6px; }
.service h3 { margin: 0; font-size: 1.12rem; }
.service p { margin: 0; font-size: 1rem; }
.service .fmt { font-family: var(--font-util); font-size: 0.75rem; color: var(--ink-soft); }
.contact { padding: 20px 22px; background: var(--tint); border-radius: 6px; margin: 1.4em 0; }
.contact .addr { font-family: var(--font-util); font-size: 1.05rem; user-select: all; }

footer.site { border-top: 1px solid var(--rule); padding-inline: 16px; padding-block: 28px 40px; font-family: var(--font-display); font-size: 0.9rem; color: var(--ink-soft); }
footer.site .inner { max-width: 1180px; margin: 0 auto; display: flex; gap: 12px 28px; flex-wrap: wrap; justify-content: space-between; }
footer.site a { color: var(--ink-soft); }

@media (max-width: 900px) {
  .shell { grid-template-columns: minmax(0, 1fr); gap: 20px; padding-block: 20px 48px; }
  .sidenav { display: none; }
  .mobilenav { display: block; font-family: var(--font-display); }
  .mobilenav summary { cursor: pointer; padding: 10px 14px; background: var(--surface); border: 1px solid var(--rule); border-radius: 6px; font-weight: 600; }
  .mobilenav .sidenav-inner { padding: 8px 4px; font-size: 0.95rem; }
  .mobilenav h2 { font-family: var(--font-util); font-size: 0.7rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-soft); margin: 14px 0 4px; font-weight: 500; }
  .mobilenav ol { list-style: none; padding: 0; margin: 0; }
  .mobilenav a { display: block; padding: 5px 8px; color: var(--ink); text-decoration: none; }
  .mobilenav a[aria-current="page"] { color: var(--accent); font-weight: 600; }
  .topnav { margin-left: 0; width: 100%; padding-bottom: 10px; gap: 14px; flex-wrap: wrap; }
  .layer { grid-template-columns: minmax(0, 1fr); gap: 4px; }
  .years { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .mobilenav { margin-bottom: 20px; }
  .layer:nth-child(2) { margin-left: 12px; }
  .layer:nth-child(3) { margin-left: 24px; }
  body { font-size: 1.06rem; }
}
@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; transition: none !important; } }

.email { margin: 1em 0 1.6em; padding: 18px 22px; background: var(--surface); border: 1px solid var(--rule); border-radius: 6px; font-size: 1.02rem; }
.email p { margin: 0 0 0.9em; }
.email p:last-child { margin-bottom: 0; }

/* Track: Before the PhD uses the navy accent */
body.track-before { --accent: var(--before); --tint: var(--before-tint); }
.topnav a.on { color: var(--accent); font-weight: 650; }