:root {
  --paper: #ffffff;
  --ink: #172126;
  --muted: #687075;
  --accent: #176b67;
  --rust: #b95335;
  --line: #dedede;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
.shell { width: min(1050px, calc(100% - 56px)); margin-inline: auto; }

.site-header {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  border-bottom: 1px solid var(--line);
}
.site-header nav { display: flex; gap: 25px; align-items: center; }
.site-header nav a {
  position: relative;
  padding: 10px 0;
  color: var(--muted);
  font-size: 13px;
}
.site-header nav a:hover, .site-header nav a.active { color: var(--ink); }
.site-header nav a.active::after {
  content: "";
  position: absolute;
  height: 2px;
  left: 0;
  right: 0;
  bottom: 3px;
  background: var(--rust);
}

.hero {
  min-height: 405px;
  display: grid;
  grid-template-columns: 1.12fr .88fr;
  gap: 48px;
  align-items: center;
  padding-block: 36px 42px;
}
.eyebrow, .section-kicker, .card-meta {
  margin: 0 0 14px;
  color: var(--rust);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .15em;
  text-transform: uppercase;
}
.hero h1 {
  margin: 0;
  font-size: clamp(44px, 5.2vw, 64px);
  font-weight: 500;
  line-height: .96;
  letter-spacing: -.05em;
}
.hero-deck {
  max-width: 530px;
  margin: 18px 0 0;
  color: #344349;
  font-size: clamp(18px, 1.8vw, 22px);
  line-height: 1.25;
  letter-spacing: -.02em;
}
.hero-links { display: flex; gap: 22px; margin-top: 18px; }
.hero-links a, .closing-links a {
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
}
.hero-links a:hover, .closing-links a:hover { color: var(--rust); }
.portrait-frame { margin: 0; justify-self: end; }
.portrait-frame img {
  width: min(100%, 265px);
  aspect-ratio: 3 / 4;
  object-fit: cover;
  object-position: center 39%;
  border-radius: 3px;
  filter: saturate(.88) contrast(.98);
  box-shadow: 13px 13px 0 #d9e2dc;
}
.portrait-frame figcaption {
  margin-top: 10px;
  color: var(--muted);
  font-size: 10px;
  letter-spacing: .09em;
}

.rule-top { border-top: 1px solid var(--line); }
.intro {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 42px;
  padding-block: 32px 36px;
}
.intro-copy { max-width: 760px; }
.intro-copy p {
  margin: 0 0 12px;
  font-size: 15.5px;
  line-height: 1.6;
}
.intro-copy p:last-child { margin-bottom: 0; }
.intro-copy a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}
.intro-copy a:hover { color: var(--rust); }

.section-block { padding-block: 40px; }
.compact-section-heading { margin-bottom: 6px; }
.compact-section-heading .section-kicker { margin-bottom: 0; }
.work-grid { display: grid; grid-template-columns: 1fr; }
.work-card {
  padding: 19px 0;
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 0 42px;
  border-bottom: 1px solid var(--line);
}
.work-card .card-meta { grid-row: 1 / span 2; }
.work-card h2 {
  margin: 0;
  max-width: 680px;
  font-size: 24px;
  font-weight: 500;
  line-height: 1.18;
  letter-spacing: -.025em;
}
.work-card > p:not(.card-meta) {
  max-width: 720px;
  margin: 9px 0 10px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.55;
}

.project-preview {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 42px;
}
.project-preview > .section-kicker { margin: 3px 0 0; }
.project-list { border-top: 1px solid var(--line); }
.project-list > a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}
.project-list strong, .project-list small { display: block; }
.project-list strong { margin-bottom: 5px; font-size: 18px; font-weight: 500; }
.project-list small, .project-list > a > span:last-child {
  color: var(--muted);
  font-size: 12px;
}
.project-list a:hover strong, .project-list a:hover > span:last-child { color: var(--accent); }

.closing {
  margin-top: 12px;
  padding-block: 30px;
  background: var(--rust);
  color: #fff8ef;
  text-align: center;
}
.closing .section-kicker { color: #ffd0bd; }
.closing > p:not(.section-kicker) {
  max-width: 650px;
  margin: 0 auto;
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.4;
}
.closing-links { margin-top: 14px; }
.closing-links a { color: #fff; }
.site-footer {
  display: flex;
  justify-content: space-between;
  padding-block: 25px 34px;
  color: var(--muted);
  font-size: 11px;
}

.simple-page { min-height: calc(100vh - 155px); padding-block: 58px 78px; }
.simple-page > h1 {
  max-width: 720px;
  margin: 0 0 38px;
  font-size: clamp(28px, 3.8vw, 38px);
  font-weight: 500;
  line-height: 1.15;
  letter-spacing: -.035em;
}
.simple-writing-list {
  margin: 0;
  padding: 0;
  max-width: 780px;
  list-style: none;
  border-top: 1px solid var(--line);
  counter-reset: writing;
}
.simple-writing-list li {
  padding: 17px 0;
  border-bottom: 1px solid var(--line);
  font-size: 16px;
  line-height: 1.45;
  counter-increment: writing;
}
.simple-writing-list li::before {
  content: "0" counter(writing);
  display: inline-block;
  width: 58px;
  color: var(--rust);
  font-size: 12px;
}

@media (max-width: 780px) {
  .shell { width: min(100% - 36px, 650px); }
  .site-header { padding-block: 18px; }
  .site-header nav { gap: 7px 17px; flex-wrap: wrap; }
  .hero { grid-template-columns: 1fr; gap: 32px; padding-block: 42px 50px; }
  .portrait-frame { justify-self: start; }
  .portrait-frame img { width: min(72vw, 280px); }
  .intro, .work-card, .project-preview { grid-template-columns: 1fr; }
  .intro { gap: 10px; }
  .work-card .card-meta { grid-row: auto; }
  .project-preview { gap: 24px; }
}

@media (max-width: 520px) {
  .hero h1 { font-size: 42px; }
  .hero-deck { font-size: 18px; }
  .intro, .section-block { padding-block: 34px; }
  .intro-copy p { font-size: 15px; }
  .work-card h2 { font-size: 22px; }
  .project-list > a { align-items: flex-start; }
  .closing { width: 100%; }
  .site-footer { flex-direction: column; gap: 7px; }
  .simple-page { padding-block: 48px 65px; }
}

/* Project demonstrations and teaching, extending the existing site palette. */
:focus-visible { outline: 2px solid var(--accent); outline-offset: 5px; }
[id] { scroll-margin-top: 24px; }
.project-feature {
  display: grid;
  grid-template-columns: 1fr 1.12fr;
  gap: 46px;
  align-items: center;
  padding-block: 25px 42px;
}
.project-feature + .project-feature { border-top: 1px solid var(--line); padding-top: 42px; }
.project-feature:last-child { padding-bottom: 0; }
.feature-copy h2, .teaching-content h2 {
  margin: 0;
  font-size: clamp(25px, 3vw, 33px);
  font-weight: 500;
  line-height: 1.12;
  letter-spacing: -.035em;
}
.feature-copy > p:not(.card-meta):not(.project-name):not(.evidence-note), .teaching-content > p:not(.card-meta):not(.teaching-subtitle) {
  margin: 14px 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.6;
}
.project-name, .teaching-subtitle { margin: 12px 0 18px; color: var(--accent); font-size: 14px; font-weight: 600; }
.project-media { min-width: 0; margin: 0; }
.project-media video { display: block; width: 100%; height: auto; background: #e7e9e9; border: 1px solid var(--line); border-radius: 3px; }
.project-media img { width: 100%; height: auto; }
.project-media figcaption, .media-description { margin: 12px 0 0; color: var(--muted); font-size: 12px; line-height: 1.5; }
.media-description { font-size: 11px; }
.media-description a { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; }
.status-dot { display: inline-block; width: 7px; height: 7px; margin-right: 5px; border-radius: 50%; background: var(--accent); }
.project-stats { display: flex; flex-wrap: wrap; gap: 28px; margin: 22px 0 16px; }
.project-stats dt { font-size: 26px; letter-spacing: -.04em; font-weight: 500; }
.project-stats dd { margin: 5px 0 0; font-size: 11px; line-height: 1.5; color: var(--muted); }
.evidence-note { margin: 12px 0; color: var(--muted); font-size: 11px; line-height: 1.6; }
.project-links { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 21px; }
.project-links a { font-size: 13px; font-weight: 700; color: var(--accent); }
.project-links a:hover { color: var(--rust); }
.project-links span { margin-left: 6px; }
.accuracy-chart { margin-block: 24px 18px; }
.chart-heading { font-size: 13px; font-weight: 600; margin: 0 0 15px; }
.accuracy-row { margin-top: 13px; }
.accuracy-row > div:first-child { display: flex; justify-content: space-between; gap: 12px; font-size: 12px; margin-bottom: 7px; }
.accuracy-row strong { font-variant-numeric: tabular-nums; }
.bar-track { width: 100%; height: 9px; background: #edf0ef; }
.bar-track span { display: block; height: 100%; }
.bar-probe { background: #91a7a4; }
.bar-finetune { background: var(--accent); }
.chart-scale { color: var(--muted); font-size: 10px; margin-top: 10px; }
.teaching-section > .section-kicker { margin-bottom: 24px; }
.teaching-disclosure { border: 2px solid #b9c9c3; border-radius: 8px; background: #f8faf7; box-shadow: 0 3px 12px rgb(30 55 45 / 5%); }
.teaching-disclosure > summary { display: flex; align-items: center; gap: 20px; padding: 28px 30px; border-radius: 6px; cursor: pointer; list-style: none; font-size: 22px; font-weight: 500; }
.teaching-disclosure > summary::-webkit-details-marker { display: none; }
.teaching-disclosure > summary:hover { background: #f5f7f4; }
.teaching-disclosure > summary small { display: block; margin-top: 8px; color: var(--muted); font-size: 13px; font-weight: 400; }
.teaching-chevron { width: 10px; height: 10px; flex: 0 0 10px; border-right: 2px solid var(--accent); border-bottom: 2px solid var(--accent); transform: rotate(-45deg); }
.teaching-disclosure[open] > summary .teaching-chevron { transform: rotate(45deg); }
.teaching-disclosure[open] > summary { border-radius: 6px 6px 0 0; border-bottom: 1px solid #b9c9c3; }
.teaching-disclosure[open] > .teaching-card { border: 0; border-radius: 0 0 6px 6px; background: white; }
.teaching-card { display: grid; grid-template-columns: 1.2fr 1fr; border: 1px solid var(--line); border-radius: 4px; overflow: hidden; }
.teaching-content { padding: 30px; }
.teaching-content h2 { font-size: clamp(25px, 3vw, 31px); }
.course-details { display: flex; flex-wrap: wrap; gap: 8px; padding: 0; margin: 20px 0 0; list-style: none; }
.course-details li { font-size: 11px; color: var(--muted); border: 1px solid var(--line); border-radius: 3px; padding: 5px 8px; }
.teaching-outline { padding: 30px; background: #f5f7f4; border-left: 1px solid var(--line); }
.outline-label { display: flex; justify-content: space-between; gap: 12px; margin: 0 0 18px; font-size: 12px; font-weight: 600; }
.outline-label span { color: var(--muted); font-weight: 400; }
.lesson-flow { padding: 0; margin: 0; list-style: none; }
.lesson-flow li { display: flex; gap: 16px; padding: 13px 0; border-top: 1px solid #d9e2dc; }
.lesson-flow span { color: var(--rust); font-size: 11px; padding-top: 2px; }
.lesson-flow strong { display: block; font-size: 13px; font-weight: 500; }
.lesson-flow small { display: block; color: var(--muted); font-size: 11px; line-height: 1.5; margin-top: 4px; }
@media (max-width: 780px) {
  .project-feature { grid-template-columns: 1fr; gap: 25px; }
  .project-feature + .project-feature { padding-top: 34px; }
  .feature-copy { max-width: 650px; }
  .teaching-card { grid-template-columns: 1fr; }
  .teaching-content, .teaching-outline { padding: 24px; }
  .teaching-outline { border-left: 0; border-top: 1px solid var(--line); }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }