:root {
  --ink: #17213c;
  --ink-soft: #3d4965;
  --paper: #f2f5f8;
  --sheet: #ffffff;
  --rule: #cbd4df;
  --rule-strong: #7d8ca3;
  --saffron: #e9ad37;
  --teal: #1f766c;
  --coral: #c85f4a;
  --blue: #315caa;
  --focus: #7b3fc6;
  --shadow: 0 18px 50px rgb(23 33 60 / 10%);
  --display: "Avenir Next Condensed", "Arial Narrow", "Helvetica Neue", sans-serif;
  --body: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --utility: ui-monospace, "SFMono-Regular", Consolas, monospace;
  color-scheme: light;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(rgb(49 92 170 / 4%) 1px, transparent 1px),
    linear-gradient(90deg, rgb(49 92 170 / 4%) 1px, transparent 1px),
    var(--paper);
  background-size: 24px 24px;
  font-family: var(--body);
  font-size: 18px;
  line-height: 1.65;
}

a { color: var(--blue); text-underline-offset: .18em; }
a:hover { color: var(--coral); }
button, input, textarea, select { font: inherit; }
button, .button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .45rem;
  min-height: 44px;
  border: 2px solid var(--ink);
  border-radius: 4px;
  padding: .55rem .9rem;
  color: var(--sheet);
  background: var(--ink);
  font-family: var(--display);
  font-weight: 700;
  letter-spacing: .02em;
  cursor: pointer;
  text-decoration: none;
}
button:hover, .button:hover { color: var(--ink); background: var(--saffron); }
button.secondary, .button.secondary { color: var(--ink); background: transparent; }
button.danger { color: #8b2819; border-color: #8b2819; background: transparent; }
:focus-visible { outline: 4px solid rgb(123 63 198 / 35%); outline-offset: 3px; }

.skip-link {
  position: fixed;
  z-index: 100;
  top: .5rem;
  left: .5rem;
  transform: translateY(-160%);
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  position: sticky;
  z-index: 20;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 66px;
  padding: .7rem clamp(1rem, 4vw, 3.5rem);
  border-bottom: 1px solid var(--rule);
  background: rgb(242 245 248 / 94%);
  backdrop-filter: blur(12px);
}
.brand {
  color: var(--ink);
  font-family: var(--display);
  font-size: 1.05rem;
  font-weight: 800;
  letter-spacing: .08em;
  text-decoration: none;
  text-transform: uppercase;
}
.site-nav { display: flex; flex-wrap: wrap; gap: .3rem .85rem; }
.site-nav a { color: var(--ink-soft); font-family: var(--display); font-size: .86rem; font-weight: 700; text-decoration: none; }
.site-nav a[aria-current="page"] { color: var(--ink); border-bottom: 3px solid var(--saffron); }
.header-progress { min-width: 100px; font: 700 .72rem/1 var(--utility); color: var(--ink-soft); }
.mini-track { display: block; height: 4px; margin-top: .35rem; overflow: hidden; background: var(--rule); }
.mini-track > span { display: block; width: 0; height: 100%; background: var(--teal); transition: width .3s ease; }

.shell { width: min(1180px, calc(100% - 2rem)); margin: 0 auto; }
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(270px, .75fr);
  gap: clamp(2rem, 6vw, 6rem);
  align-items: center;
  min-height: 680px;
  padding: clamp(4rem, 9vw, 7rem) 0 4rem;
}
.eyebrow, .kicker, .utility {
  margin: 0 0 .7rem;
  color: var(--ink-soft);
  font: 700 .75rem/1.35 var(--utility);
  letter-spacing: .09em;
  text-transform: uppercase;
}
h1, h2, h3 { color: var(--ink); font-family: var(--display); line-height: 1.03; }
h1 { max-width: 900px; margin: 0; font-size: clamp(3.4rem, 10vw, 8.5rem); letter-spacing: -.055em; }
h2 { margin: 0 0 1.25rem; font-size: clamp(2rem, 5vw, 4rem); letter-spacing: -.035em; }
h3 { margin: 1.5rem 0 .65rem; font-size: clamp(1.3rem, 2.2vw, 1.85rem); }
.lede { max-width: 680px; color: var(--ink-soft); font-size: clamp(1.15rem, 2vw, 1.45rem); }
.hero-note { border-left: 5px solid var(--saffron); padding: 1.4rem 0 1.4rem 1.4rem; }
.hero-note strong { display: block; font: 800 clamp(2.5rem, 6vw, 5rem)/.9 var(--display); letter-spacing: -.04em; }
.actions { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 1.7rem; }

.band { padding: clamp(3rem, 8vw, 7rem) 0; border-top: 1px solid var(--rule); }
.band.ink { color: #eaf0f6; background: var(--ink); }
.band.ink h2, .band.ink h3 { color: #fff; }
.band.ink .eyebrow, .band.ink .lede { color: #c8d1df; }
.band.ink .phase-card { border-color: #4d5875; background: rgb(255 255 255 / 4%); }
.band.ink .phase-card p, .band.ink .phase-card .range { color: #c8d1df; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.phase-card, .info-card {
  position: relative;
  min-height: 220px;
  padding: 1.4rem;
  border: 1px solid var(--rule);
  background: rgb(255 255 255 / 80%);
}
.phase-card::before { content: ""; position: absolute; inset: 0 auto 0 0; width: 5px; background: var(--phase, var(--saffron)); }
.phase-card .range { font: 700 .75rem/1 var(--utility); color: var(--ink-soft); }
.phase-card p, .info-card p { color: var(--ink-soft); }

.learning-spine { display: grid; grid-template-columns: repeat(28, 1fr); gap: 4px; margin: 2rem 0; }
.learning-spine a { aspect-ratio: 1; min-width: 10px; border: 1px solid var(--rule-strong); background: var(--sheet); text-indent: -9999px; }
.learning-spine a[data-complete="true"] { border-color: var(--teal); background: var(--teal); }

.page-layout {
  display: grid;
  grid-template-columns: 180px minmax(0, 780px);
  gap: clamp(1.5rem, 5vw, 5rem);
  justify-content: center;
  align-items: start;
  padding: 3rem 0 6rem;
}
.lesson-spine { position: sticky; top: 96px; border-left: 6px solid var(--saffron); padding-left: 1rem; }
.lesson-spine .day-number { display: block; font: 800 3.8rem/.9 var(--display); letter-spacing: -.05em; }
.lesson-spine dl { margin: 1.25rem 0; }
.lesson-spine dt { margin-top: .7rem; color: var(--ink-soft); font: 700 .65rem/1 var(--utility); text-transform: uppercase; }
.lesson-spine dd { margin: .2rem 0; font-family: var(--display); font-weight: 700; line-height: 1.25; }
.badge { display: inline-block; margin: .2rem .2rem .2rem 0; padding: .18rem .42rem; border: 1px solid currentColor; border-radius: 999px; font: 800 .66rem/1 var(--utility); }
.badge.src { color: var(--blue); }
.badge.app { color: var(--teal); }
.badge.enr { color: var(--coral); }

.lesson-paper { min-width: 0; padding: clamp(1.5rem, 5vw, 4.5rem); border: 1px solid var(--rule); background: var(--sheet); box-shadow: var(--shadow); }
.lesson-paper h1 { max-width: 760px; font-size: clamp(2.6rem, 6vw, 5.4rem); }
.lesson-paper > section { padding: 2.2rem 0; border-top: 1px solid var(--rule); }
.lesson-paper > section:first-of-type { margin-top: 2.5rem; }
.outcome-list li, .check-list li { margin: .65rem 0; }
.decision-note { margin: 1.5rem 0; padding: 1.2rem 1.4rem; border-left: 5px solid var(--teal); background: #edf6f4; }
.worked-example { position: relative; padding: 1.5rem; border: 1px solid var(--ink); background: #f7f9fc; }
.worked-example::after { content: attr(data-industry); position: absolute; top: -.75rem; right: 1rem; padding: .2rem .55rem; color: #fff; background: var(--ink); font: 700 .68rem/1 var(--utility); text-transform: uppercase; }
.exercise { padding: 1.5rem; border: 2px dashed var(--rule-strong); }
.artifact { color: #fff; background: var(--ink); padding: 1.5rem; }
.artifact h3 { color: #fff; margin-top: 0; }
.knowledge details { padding: .9rem 0; border-bottom: 1px solid var(--rule); }
.knowledge summary { cursor: pointer; font-family: var(--display); font-weight: 750; }
.review-links { display: grid; grid-template-columns: repeat(3, 1fr); gap: .75rem; }
.review-links a, .review-links span { min-height: 100px; padding: 1rem; border: 1px solid var(--rule); text-decoration: none; }
.review-links strong { display: block; color: var(--ink); font-family: var(--display); }

.field { display: grid; gap: .35rem; margin: 1rem 0; }
.field label { font-family: var(--display); font-weight: 700; }
textarea, input[type="number"] { width: 100%; border: 1px solid var(--rule-strong); border-radius: 3px; padding: .7rem; color: var(--ink); background: #fff; }
textarea { min-height: 130px; resize: vertical; }
.confidence { display: grid; grid-template-columns: repeat(4, 1fr); gap: .4rem; }
.confidence label { position: relative; }
.confidence input { position: absolute; opacity: 0; }
.confidence span { display: grid; place-items: center; min-height: 54px; padding: .3rem; border: 1px solid var(--rule-strong); font: 700 .75rem/1.2 var(--display); text-align: center; cursor: pointer; }
.confidence input:checked + span { color: #fff; border-color: var(--teal); background: var(--teal); }
.completion-row { display: flex; align-items: center; justify-content: space-between; gap: 1rem; margin-top: 1.5rem; }
.complete-button[aria-pressed="true"] { border-color: var(--teal); background: var(--teal); }
.save-status { min-height: 1.2em; color: var(--teal); font: 700 .7rem/1 var(--utility); }
.lesson-nav { display: grid; grid-template-columns: 1fr auto 1fr; gap: 1rem; align-items: center; margin-top: 2rem; }
.lesson-nav a { font-family: var(--display); font-weight: 750; text-decoration: none; }
.lesson-nav .next { text-align: right; }

.curriculum-list { display: grid; gap: 1rem; }
.week-row { display: grid; grid-template-columns: 90px minmax(210px, .8fr) 1.6fr; gap: 1rem; padding: 1.2rem; border: 1px solid var(--rule); background: rgb(255 255 255 / 85%); }
.week-row h3 { margin: 0; }
.day-links { display: grid; grid-template-columns: repeat(5, 1fr); gap: .35rem; }
.day-links a { display: grid; align-content: space-between; min-height: 110px; padding: .65rem; border: 1px solid var(--rule); color: var(--ink); background: #fff; font-family: var(--display); font-size: .82rem; font-weight: 700; text-decoration: none; }
.day-links a[data-complete="true"] { border-color: var(--teal); box-shadow: inset 0 -5px var(--teal); }

.progress-board { display: grid; grid-template-columns: 1fr 2fr; gap: 2rem; }
.progress-stat { padding: 1.5rem; color: #fff; background: var(--ink); }
.progress-stat strong { display: block; font: 800 4rem/.9 var(--display); }
.progress-grid { display: grid; grid-template-columns: repeat(10, 1fr); gap: .35rem; }
.progress-grid a { aspect-ratio: 1; display: grid; place-items: center; border: 1px solid var(--rule-strong); color: var(--ink); background: #fff; font: 700 .65rem/1 var(--utility); text-decoration: none; }
.progress-grid a[data-complete="true"] { color: #fff; border-color: var(--teal); background: var(--teal); }
.tool-row { display: flex; flex-wrap: wrap; gap: .7rem; margin: 1.5rem 0; }
.notice { padding: 1rem 1.2rem; border-left: 5px solid var(--saffron); background: #fff8e8; }
.error { border-left-color: var(--coral); background: #fff0ed; }
.visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.site-footer { padding: 2rem clamp(1rem, 4vw, 3.5rem); border-top: 1px solid var(--rule); color: var(--ink-soft); font-size: .88rem; }

@media (max-width: 900px) {
  .hero, .page-layout, .progress-board { grid-template-columns: 1fr; }
  .hero { min-height: auto; }
  .lesson-spine { position: static; display: grid; grid-template-columns: auto 1fr; gap: 1rem; border-left-width: 5px; }
  .lesson-spine dl { margin: 0; }
  .grid-3 { grid-template-columns: 1fr 1fr; }
  .week-row { grid-template-columns: 70px 1fr; }
  .week-row .day-links { grid-column: 1 / -1; }
}

@media (max-width: 620px) {
  body { font-size: 17px; }
  .site-header { position: static; align-items: flex-start; }
  .site-nav { justify-content: flex-end; }
  .header-progress { display: none; }
  .shell { width: min(100% - 1rem, 1180px); }
  .hero { padding-top: 3rem; }
  h1 { font-size: clamp(3rem, 18vw, 5rem); }
  .grid-3, .review-links, .confidence { grid-template-columns: 1fr; }
  .learning-spine { grid-template-columns: repeat(14, 1fr); }
  .lesson-paper { padding: 1.25rem; }
  .lesson-paper h1 { font-size: clamp(2.5rem, 14vw, 4.2rem); }
  .day-links { grid-template-columns: 1fr; }
  .day-links a { min-height: 70px; }
  .progress-grid { grid-template-columns: repeat(7, 1fr); }
  .lesson-nav { grid-template-columns: 1fr 1fr; }
  .lesson-nav .middle { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; animation: none !important; }
}

@media print {
  body { color: #000; background: #fff; font-size: 11pt; }
  .site-header, .site-footer, .lesson-spine button, .reflection, .lesson-nav, .skip-link { display: none !important; }
  .shell, .page-layout { width: 100%; display: block; padding: 0; }
  .lesson-spine { position: static; margin-bottom: 1rem; border-color: #000; }
  .lesson-paper { padding: 0; border: 0; box-shadow: none; }
  .lesson-paper > section { break-inside: avoid; }
  a { color: #000; text-decoration: none; }
}