:root {
  --bg: #f4f1e8;
  --ink: #17150f;
  --accent: #c8ff2e;
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: 'Space Mono', monospace;
  display: flex;
  justify-content: center;
  padding: clamp(28px, 5vw, 72px) clamp(24px, 5vw, 76px) 48px;
  min-height: 100vh;
}
a { color: inherit; text-decoration: none; }
a:hover { opacity: .85; }
::selection { background: var(--accent); color: var(--ink); }

hr { border-color: var(--accent); width:100%; }

.page { width: 100%; max-width: 1120px; display: flex; flex-direction: column; min-height: calc(100vh - 96px); }

/* ---------- topbar ---------- */
.topbar { display: flex; justify-content: space-between; align-items: center; font-size: 12px; letter-spacing: .2em; text-transform: uppercase; gap: 16px; }
.topbar b { font-weight: 700; }
.topbar span { color: color-mix(in srgb, var(--ink) 50%, transparent); text-align: right; }
.topbar a.home { font-weight: 700; border-bottom: 2px solid var(--accent); padding-bottom: 1px; }
.topbar .crumb span { text-align: left; }
.rule { height: 1px; background: color-mix(in srgb, var(--ink) 20%, transparent); margin-top: 14px; }

/* ---------- masthead ---------- */
.masthead { margin-top: clamp(48px, 7vw, 78px); }
.eyebrow { font-size: 12px; letter-spacing: .3em; text-transform: uppercase; color: color-mix(in srgb, var(--ink) 50%, transparent); }
h1 { font-family: 'Instrument Serif', serif; font-weight: 400; font-size: clamp(50px, 8.6vw, 96px); line-height: .98; letter-spacing: -.01em; margin: 18px 0 0; }
h1 .hl {
  background: var(--accent);
  padding: 0 .1em;
  box-decoration-break: clone;
  -webkit-box-decoration-break: clone;
}
.lede { font-size: 15px; line-height: 1.75; color: color-mix(in srgb, var(--ink) 72%, transparent); max-width: 600px; margin: 30px 0 0; }

/* ---------- section headers (index list / teachers steps) ---------- */
.listhead, .sechead { margin-top: clamp(52px, 8vw, 84px); display: flex; align-items: baseline; justify-content: space-between; gap: 16px; }
.listhead .label, .sechead .label { font-size: 12px; letter-spacing: .26em; text-transform: uppercase; }
.listhead .count, .sechead .meta { font-size: 12px; letter-spacing: .26em; color: color-mix(in srgb, var(--ink) 50%, transparent); }

/* ---------- index rows ---------- */
.rows { margin-top: 8px; }
.row {
  display: grid;
  grid-template-columns: 100px 1fr auto;
  gap: clamp(16px, 3vw, 30px);
  align-items: start;
  padding: 32px 22px;
  border-top: 1px solid color-mix(in srgb, var(--ink) 18%, transparent);
  transition: background .18s;
}
.row:last-child { border-bottom: 1px solid color-mix(in srgb, var(--ink) 18%, transparent); }
.row:hover { background: color-mix(in srgb, var(--accent) 20%, transparent); }
.row .num { font-family: 'Instrument Serif', serif; font-size: 70px; line-height: .8; }
.row:nth-child(1) .num { transform: rotate(-6deg); }
.row:nth-child(2) .num { transform: rotate(4deg); }
.row:nth-child(3) .num { transform: rotate(-3deg); }
.row .title { font-family: 'Instrument Serif', serif; font-size: clamp(30px, 4vw, 40px); line-height: 1; }
.row .desc { font-size: 14px; line-height: 1.6; color: color-mix(in srgb, var(--ink) 68%, transparent); margin-top: 12px; max-width: 520px; }
.row .url { font-size: 13px; margin-top: 16px; letter-spacing: .02em; border-bottom: 2px solid var(--accent); display: inline-block; padding-bottom: 2px; }
.row .grade { font-size: 11px; letter-spacing: .16em; text-transform: uppercase; text-align: right; color: color-mix(in srgb, var(--ink) 55%, transparent); line-height: 1.6; }

/* ---------- about: photo + prose ---------- */
.body { margin-top: clamp(52px, 8vw, 80px); display: grid; grid-template-columns: 360px 1fr; gap: clamp(32px, 5vw, 64px); align-items: start; }
@media (max-width: 800px) { .body { grid-template-columns: 1fr; } }

.photo {
  aspect-ratio: 4 / 5;
  width: 100%;
  object-fit: cover;
  display: block;
  border: 1px solid color-mix(in srgb, var(--ink) 28%, transparent);
}
.caption { margin-top: 12px; font-size: 11px; letter-spacing: .12em; text-transform: uppercase; color: color-mix(in srgb, var(--ink) 50%, transparent); }

.prose { max-width: 620px; }
.prose .kick { font-family: 'Instrument Serif', serif; font-size: clamp(26px, 3.6vw, 36px); line-height: 1.2; margin: 0 0 24px; }
.prose p { font-size: 15px; line-height: 1.85; color: color-mix(in srgb, var(--ink) 78%, transparent); margin: 0 0 18px; }
.prose section {
  border-left: 2px solid var(--accent);
  padding: 4px 0 4px 18px;
  color: color-mix(in srgb, var(--ink) 50%, transparent);
  font-size: 13px;
  line-height: 1.7;
}
.prose section b { color: var(--ink); }
.prose a { border-bottom: 2px solid var(--accent); padding-bottom: 1px; }

.facts { margin-top: 40px; border-top: 1px solid color-mix(in srgb, var(--ink) 18%, transparent); padding-top: 20px; display: grid; grid-template-columns: 1fr 1fr; gap: 18px 32px; }
.fact .k { font-size: 11px; letter-spacing: .2em; text-transform: uppercase; color: color-mix(in srgb, var(--ink) 50%, transparent); }
.fact .v { margin-top: 6px; font-size: 14px; }
.fact a { border-bottom: 2px solid var(--accent); padding-bottom: 1px; }

/* ---------- teachers: steps, columns, cta ---------- */
.steps { margin-top: 8px; }
.step {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: clamp(16px, 3vw, 30px);
  align-items: start;
  padding: 30px 22px;
  border-top: 1px solid color-mix(in srgb, var(--ink) 18%, transparent);
}
.steps .step:last-child { border-bottom: 1px solid color-mix(in srgb, var(--ink) 18%, transparent); }
.step .num { font-family: 'Instrument Serif', serif; font-size: 70px; line-height: .8; }
.step:nth-child(1) .num { transform: rotate(-6deg); }
.step:nth-child(2) .num { transform: rotate(4deg); }
.step:nth-child(3) .num { transform: rotate(-3deg); }
.step:nth-child(4) .num { transform: rotate(5deg); }
.step .title { font-family: 'Instrument Serif', serif; font-size: clamp(26px, 3.6vw, 36px); line-height: 1.02; }
.step .desc { font-size: 14px; line-height: 1.7; color: color-mix(in srgb, var(--ink) 68%, transparent); margin-top: 12px; max-width: 560px; }
.step .desc code { background: color-mix(in srgb, var(--accent) 35%, transparent); padding: 1px 6px; font-size: 13px; }

.cols { margin-top: clamp(36px, 5vw, 52px); display: grid; grid-template-columns: 1fr 1fr; gap: clamp(28px, 4vw, 56px); }
@media (max-width: 720px) { .cols { grid-template-columns: 1fr; } }
.col h3 { font-family: 'Instrument Serif', serif; font-weight: 400; font-size: 30px; margin: 0 0 18px; }
.checklist { list-style: none; margin: 0; padding: 0; }
.checklist li { position: relative; padding: 0 0 14px 26px; font-size: 14px; line-height: 1.6; color: color-mix(in srgb, var(--ink) 80%, transparent); }
.checklist li::before { content: ""; position: absolute; left: 0; top: 6px; width: 10px; height: 10px; background: var(--accent); }
.checklist li b { color: var(--ink); }

/* Call To Action */
.cta { margin-top: clamp(44px, 6vw, 68px); border: 2px solid var(--ink); padding: clamp(28px, 4vw, 44px); }
.cta .k { font-size: 12px; letter-spacing: .26em; text-transform: uppercase; color: color-mix(in srgb, var(--ink) 50%, transparent); }
.cta h2 { font-family: 'Instrument Serif', serif; font-weight: 400; font-size: clamp(34px, 5vw, 52px); line-height: 1.02; margin: 14px 0 0; }
.cta p { font-size: 14px; line-height: 1.75; color: color-mix(in srgb, var(--ink) 72%, transparent); max-width: 560px; margin: 18px 0 0; }
.cta .actions { margin-top: 28px; display: flex; flex-wrap: wrap; gap: 14px 28px; align-items: center; }
.cta .btn { background: var(--ink); color: var(--bg); font-size: 13px; letter-spacing: .1em; text-transform: uppercase; padding: 14px 22px; display: inline-flex; align-items: center; gap: 10px; }
.cta .btn:hover { opacity: 1; box-shadow: 5px 5px 0 var(--accent); }
.cta .or { font-size: 13px; color: color-mix(in srgb, var(--ink) 60%, transparent); }
.cta .or a { border-bottom: 2px solid var(--accent); padding-bottom: 1px; }

/* ---------- footer ---------- */
footer { margin-top: auto; padding-top: 56px; }
footer .bar { height: 2px; background: var(--ink); }
.colophon { display: flex; flex-wrap: wrap; gap: 24px; justify-content: space-between; align-items: flex-end; margin-top: 16px; font-size: 12px; letter-spacing: .04em; }
.colophon .k { text-transform: uppercase; letter-spacing: .2em; color: color-mix(in srgb, var(--ink) 50%, transparent); }
.colophon .who { margin-top: 8px; font-size: 15px; }
.colophon a { border-bottom: 2px solid var(--accent); padding-bottom: 1px; }
.colophon .nav { text-align: right; color: color-mix(in srgb, var(--ink) 50%, transparent); }
.colophon .nav .links { color: var(--ink); }

/* ---------- responsive ---------- */
@media (max-width: 640px) {
  .topbar { flex-wrap: wrap; }
  .topbar span, .topbar .crumb { text-align: left; flex-basis: 100%; }
  .row { grid-template-columns: 56px 1fr; gap: 4px 16px; padding: 26px 4px; }
  .row .num { font-size: 46px; }
  .row .grade { text-align: left; margin-top: 4px; }
  .step { grid-template-columns: 56px 1fr; gap: 4px 16px; padding: 26px 4px; }
  .step .num { font-size: 46px; }
  .facts { grid-template-columns: 1fr; }
  .colophon .nav { text-align: left; }
}