.course-hub {
  min-height: 100vh;
  color: var(--ink-950);
  background: var(--ink-50);
}

.course-hub__topbar {
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  gap: var(--space-5);
  padding: 0 max(var(--space-4), calc((100vw - 1160px) / 2));
  color: var(--paper);
  background: var(--ink-950);
  border-bottom: 1px solid rgb(255 255 255 / .12);
}

.course-hub__brand {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  color: inherit;
  text-decoration: none;
}

.course-hub__brand > span:last-child,
.course-hub__brand b,
.course-hub__brand small { display: block; }
.course-hub__brand b { font-family: var(--font-display); }
.course-hub__brand small { color: #b8c8dd; font: 600 .68rem/1.2 var(--font-mono); letter-spacing: .06em; text-transform: uppercase; }
.course-hub__main {
  width: min(100%, 1160px);
  margin: 0 auto;
  padding: var(--space-10) var(--space-6) calc(var(--space-12) * 1.5);
}

.course-hub__hero {
  padding-bottom: var(--space-8);
  border-bottom: 1px solid var(--ink-200);
}

.course-hub__hero-copy { max-width: 960px; }
.course-hub__hero h1 {
  max-width: 940px;
  margin: 0 0 var(--space-4);
  font: 700 clamp(2.35rem, 4.25vw, 4rem)/1 var(--font-display);
  letter-spacing: -.045em;
  text-wrap: balance;
}
.course-hub__hero-copy > p { max-width: 650px; margin: 0; color: var(--ink-600); font-size: var(--text-lg); }

.day-path { margin-top: var(--space-8); }
.day-path__head {
  margin-bottom: var(--space-6);
}
.day-path__head h2 { margin: var(--space-2) 0 0; font: 700 var(--text-2xl)/1.1 var(--font-display); }
.day-path ol { position: relative; display: grid; gap: var(--space-5); margin: 0; padding: 0; list-style: none; }
.day-path ol::before { content: ""; position: absolute; top: 34px; bottom: 34px; left: 25px; width: 2px; background: var(--ink-200); }
.day-path__item {
  --node-accent: var(--red-700);
  position: relative;
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  align-items: center;
  gap: var(--space-5);
}
.day-path__item:nth-child(2) { --node-accent: var(--blue-700); }
.day-path__item:nth-child(3) { --node-accent: var(--green-700); }
.day-path__item[data-progress-state="complete"]:not(:last-child)::after {
  content: "";
  position: absolute;
  z-index: 0;
  top: 50%;
  left: 25px;
  width: 2px;
  height: calc(100% + var(--space-5));
  background: var(--green-700);
}
.day-path__node {
  z-index: 1;
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  border: 4px solid var(--ink-50);
  border-radius: 50%;
  color: var(--node-accent);
  background: var(--paper);
  box-shadow: 0 0 0 1px var(--node-accent);
  font: 700 var(--text-sm)/1 var(--font-mono);
  transition: color 180ms var(--ease), background-color 180ms var(--ease), box-shadow 180ms var(--ease);
}
.day-path__item[data-progress-state="current"] .day-path__node {
  color: var(--paper);
  background: var(--node-accent);
  box-shadow: 0 0 0 1px var(--node-accent), 0 0 0 5px var(--ink-50), 0 0 0 7px var(--node-accent);
}
.day-path__item[data-progress-state="complete"] .day-path__node {
  color: var(--paper);
  background: var(--green-700);
  box-shadow: 0 0 0 1px var(--green-700);
  font-size: 1.15rem;
}
.day-path__item[data-availability="comingSoon"] .day-path__node { color: var(--ink-700); background: var(--ink-100); box-shadow: 0 0 0 1px var(--ink-300); }

.day-card {
  --day-accent: var(--red-700);
  display: grid;
  grid-template-columns: minmax(0, 1fr) 190px;
  min-width: 0;
  border: 1px solid var(--ink-200);
  border-top: 4px solid var(--day-accent);
  border-radius: var(--radius-lg);
  background: var(--paper);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: border-color 180ms var(--ease), box-shadow 180ms var(--ease);
}
.day-card.is-recommended {
  border-color: var(--day-accent);
  box-shadow: var(--shadow-md);
}
.day-path__item:nth-child(2) .day-card { --day-accent: var(--blue-700); }
.day-path__item:nth-child(3) .day-card { --day-accent: var(--green-700); }
.day-card.is-complete { border-color: var(--green-100); border-top-color: var(--green-700); box-shadow: none; }
.day-card.is-complete.is-recommended,
.day-card:focus-within { box-shadow: var(--shadow-md); }
.day-path__item[data-availability="comingSoon"] .day-card { border-top-color: var(--ink-300); box-shadow: none; }
.day-card__main { min-width: 0; padding: var(--space-6); }
.day-card__heading { display: flex; align-items: start; justify-content: space-between; gap: var(--space-5); }
.day-card__heading h2 { margin: var(--space-1) 0 0; font: 700 var(--text-xl)/1.15 var(--font-display); }
.day-status { flex: 0 0 auto; min-height: 28px; display: inline-flex; align-items: center; padding: .3rem .6rem; border-radius: var(--radius-pill); color: var(--blue-800); background: var(--blue-50); font: 700 .68rem/1 var(--font-mono); }
.day-status[data-status="complete"] { color: var(--green-800); background: var(--green-50); }
.day-status[data-status="available"],
.day-status[data-status="pending"] { color: var(--ink-700); background: var(--ink-100); }
.day-card__outcome { max-width: 760px; margin: var(--space-4) 0; color: var(--ink-700); }
.day-card__facts, .day-card__contents { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-2) var(--space-4); }
.day-card__facts { color: var(--ink-600); font-size: var(--text-sm); }
.day-card__facts span:first-child { font-weight: 700; }
.day-card__facts span + span::before { content: "·"; margin-right: var(--space-4); color: var(--ink-300); }
.day-card__contents { margin: var(--space-3) 0 0; padding: 0; color: var(--ink-700); font-size: var(--text-sm); list-style: none; }
.day-card__contents b { color: var(--ink-950); font: 800 var(--text-xs)/1 var(--font-mono); }
.day-card__contents li { display: inline-flex; align-items: baseline; gap: .3rem; }
.day-card__contents li + li::before { content: "·"; margin-right: calc(var(--space-4) - .3rem); color: var(--ink-300); }
.day-card__aside {
  display: grid;
  place-content: center;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-5);
  border-left: 1px solid var(--ink-200);
  background: var(--ink-50);
  text-align: center;
}
.day-card__action { width: 100%; text-decoration: none; }
.day-card__action span { transition: transform 160ms var(--ease); }
.day-card__action:hover span,
.day-card__action:focus-visible span { transform: translateX(3px); }
.day-card__pending { min-width: 132px; min-height: 44px; display: inline-grid; place-items: center; padding: .65rem 1rem; border: 1px dashed var(--ink-300); border-radius: var(--radius-md); color: var(--ink-700); background: var(--paper); font-weight: 700; }
.day-card__aside small { color: var(--ink-600); line-height: 1.35; }
.day-card__sequence { max-width: 150px; }
.day-card__recommendation {
  color: var(--day-accent);
  font: 800 .68rem/1 var(--font-mono);
  letter-spacing: .08em;
  text-transform: uppercase;
}

.day-progress { max-width: 520px; margin-top: var(--space-5); }
.day-progress__copy { display: flex; justify-content: space-between; gap: var(--space-4); margin-bottom: var(--space-2); color: var(--ink-600); font: 700 var(--text-xs)/1.2 var(--font-mono); }
.day-progress__copy b { color: var(--ink-900); }
.day-progress__track { height: 5px; overflow: hidden; border-radius: var(--radius-pill); background: var(--ink-100); }
.day-progress__track i { display: block; height: 100%; background: var(--day-accent); transition: width 280ms var(--ease); }
.day-card.is-complete .day-progress__track i { background: var(--green-700); }
.day-progress__definition { margin: var(--space-2) 0 0; color: var(--ink-600); font-size: var(--text-xs); }

@media (max-width: 860px) {
  .course-hub__main { padding: var(--space-10) var(--space-5) var(--space-12); }
  .day-card { grid-template-columns: 1fr; }
  .day-card__aside { grid-template-columns: minmax(180px, auto) 1fr; justify-content: start; border-top: 1px solid var(--ink-200); border-left: 0; text-align: left; }
}

@media (max-width: 600px) {
  .course-hub__topbar { min-height: 58px; padding: 0 var(--space-4); }
  .course-hub__main { padding: var(--space-8) var(--space-4) var(--space-12); }
  .course-hub__hero { padding-bottom: var(--space-6); }
  .course-hub__hero h1 { font-size: clamp(2.1rem, 9.5vw, 2.45rem); }
  .course-hub__hero-copy > p { font-size: var(--text-md); }
  .day-path { margin-top: var(--space-6); }
  .day-path__head h2 { font-size: var(--text-xl); }
  .day-path ol { gap: var(--space-6); }
  .day-path ol::before { left: 19px; }
  .day-path__item { grid-template-columns: 40px minmax(0, 1fr); align-items: start; gap: var(--space-3); }
  .day-path__item[data-progress-state="complete"]:not(:last-child)::after { top: 36px; left: 19px; height: calc(100% + var(--space-6)); }
  .day-path__node { width: 40px; height: 40px; margin-top: var(--space-4); border-width: 3px; font-size: .68rem; }
  .day-card__main { padding: var(--space-4); }
  .day-card__heading { display: grid; gap: var(--space-3); }
  .day-status { width: fit-content; }
  .day-card__facts { display: grid; gap: var(--space-1); }
  .day-card__facts span + span::before { content: none; }
  .day-card__contents { gap: var(--space-1) var(--space-3); }
  .day-card__contents li + li::before { content: none; }
  .day-card__aside { grid-template-columns: 1fr; padding: var(--space-3) var(--space-4); }
  .day-card.is-recommended .day-card__aside {
    order: -1;
    border-top: 0;
    border-bottom: 1px solid var(--ink-200);
  }
  .day-card__pending { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  .day-path__node,
  .day-card,
  .day-card__action span,
  .day-progress__track i { transition: none; }
}