/* Interview-guide additions. Extends the shared course.css visual language. */

:root {
  --easy: #2d7d46;
  --intermediate: #b9772a;
  --advanced: #8a3f62;
}

html { scroll-behavior: smooth; }

.guide-nav {
  display: flex;
  flex-wrap: nowrap;
  align-items: center;
  gap: 0.35rem;
  margin: 1.4rem 0 2rem;
  padding: 0.55rem 0;
  border-bottom: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: 0.78rem;
  overflow-x: auto;
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--paper) 94%, transparent);
  backdrop-filter: blur(8px);
  scrollbar-width: none;
}

.guide-nav::-webkit-scrollbar { display: none; }

.guide-nav a {
  flex: 0 0 auto;
  padding: 0.48rem 0.65rem;
  border-radius: 8px;
  color: var(--accent);
  font-weight: 600;
  text-decoration: none;
  transition: color 0.15s ease, background-color 0.15s ease;
}

.guide-nav a:hover { background: var(--accent-soft); }

.guide-nav a[data-level].is-active {
  color: #fff;
  background: var(--accent);
  box-shadow: 0 3px 0 color-mix(in srgb, var(--accent) 72%, #000);
}

.guide-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin: 1.2rem 0;
}

.guide-meta span {
  border: 1px solid var(--rule);
  border-radius: 999px;
  padding: 0.25rem 0.65rem;
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 0.72rem;
}

.qa {
  margin: 1.1rem 0;
  padding: 1rem 1.1rem;
  border: 1px solid var(--rule);
  border-radius: 9px;
  background: #fff;
  break-inside: avoid;
}

.qa h3 {
  margin: 0 0 0.75rem;
  line-height: 1.35;
}

.qa p { margin: 0.65rem 0; }
.qa ul { margin: 0.45rem 0 0; }

.level-heading {
  margin-top: 3.2rem;
  border-bottom-width: 2px;
}

#easy { border-bottom-color: var(--easy); }
#intermediate { border-bottom-color: var(--intermediate); }
#advanced { border-bottom-color: var(--advanced); }

.answer-label {
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.source-list {
  font-size: 0.86rem;
  overflow-wrap: anywhere;
}

.back-to-top {
  display: block;
  margin-top: 0.8rem;
  text-align: right;
  font-family: var(--mono);
  font-size: 0.7rem;
}

@media (max-width: 42rem) {
  html { font-size: 16px; }
  body { padding-inline: 1rem; }
  .qa { padding: 0.85rem; }
  .guide-nav {
    margin-inline: -1rem;
    padding-inline: 1rem;
  }
}

@media print {
  .guide-nav, .back-to-top { display: none; }
  .qa {
    border-color: #bbb;
    box-shadow: none;
  }
  h2, h3 { break-after: avoid; }
}