.undergrad-guide {
  margin: 1.8rem 0 2.4rem;
  border: 1px solid color-mix(in srgb, var(--accent) 30%, var(--line));
  background: var(--surface);
  border-radius: calc(var(--radius) + 6px);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.undergrad-guide-header {
  padding: 1.4rem 1.5rem 1.2rem;
  background: linear-gradient(135deg, color-mix(in srgb, var(--accent-soft) 68%, var(--surface)), var(--surface));
  border-bottom: 1px solid var(--line);
}

.undergrad-guide-header .eyebrow { margin-bottom: .45rem; }
.undergrad-guide-header h2 { margin-bottom: .45rem; font-family: var(--font-display); font-size: 2.15rem; }
.undergrad-guide-header p { max-width: 74ch; margin-bottom: .5rem; }
.undergrad-guide-header .guide-question { color: var(--accent-2); font-weight: 700; }

.undergrad-guide-body { padding: 1.25rem 1.5rem 1.5rem; }

.undergrad-start-here {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr);
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.undergrad-start-here > div {
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-2);
}

.undergrad-start-here h3 { margin-bottom: .55rem; }
.undergrad-start-here ul { margin-bottom: 0; }

.story-ladder {
  position: relative;
  display: grid;
  gap: .8rem;
  margin: 1rem 0 1.6rem;
}

.story-step {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: .85rem;
  align-items: start;
  padding: 1rem 1.05rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.story-step-number {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  color: white;
  background: var(--accent);
  font: 700 .76rem var(--font-code);
}

.story-step h3 { margin: .05rem 0 .35rem; font-size: 1.02rem; }
.story-step p { margin-bottom: .55rem; }
.story-step .tiny-example,
.story-step .remember-box {
  padding: .65rem .75rem;
  border-left: 3px solid var(--line);
  color: var(--muted);
  background: var(--surface-2);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: .82rem;
}
.story-step .remember-box { margin-top: .45rem; border-left-color: var(--accent); color: var(--ink); }
.story-step .tiny-example strong,
.story-step .remember-box strong { color: var(--ink); }

.vocabulary-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .65rem;
}

.vocabulary-card {
  padding: .8rem .9rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--surface) 94%, var(--accent) 6%);
}
.vocabulary-card dt { margin-bottom: .25rem; color: var(--accent-2); font-weight: 750; }
.vocabulary-card dd { margin: 0; color: var(--muted); font-size: .82rem; }

.guide-depth-note {
  margin-top: 1.35rem;
  padding: .9rem 1rem;
  border: 1px dashed color-mix(in srgb, var(--lean) 45%, var(--line));
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--surface) 96%, var(--lean) 4%);
  font-size: .83rem;
}

@media (max-width: 760px) {
  .undergrad-start-here,
  .vocabulary-grid { grid-template-columns: 1fr; }
  .undergrad-guide-header,
  .undergrad-guide-body { padding-left: 1rem; padding-right: 1rem; }
  .story-step { grid-template-columns: 34px minmax(0, 1fr); padding: .85rem; }
  .story-step-number { width: 32px; height: 32px; }
}