code {
  font-family: "JetBrains Mono", "SFMono-Regular", Menlo, monospace;
  background: rgba(27, 95, 214, 0.1);
  padding: 1px 6px;
  border-radius: 6px;
  font-size: 0.92em;
  color: var(--navy);
}

/* ===== LEARN HERO ===== */
.learn-hero {
  position: relative;
  padding: 96px 0 56px;
  background:
    radial-gradient(circle at 15% 0%, rgba(63, 123, 246, 0.35), transparent 40%),
    radial-gradient(circle at 90% 10%, rgba(247, 181, 0, 0.22), transparent 45%),
    linear-gradient(160deg, #081633 0%, #102858 55%, #163f87 100%);
  overflow: hidden;
}
.learn-hero-title {
  color: #fff !important;
}



.learn-hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 18px;
  max-width: 720px;
}

.learn-hero-title {
  color: #fff !important;
}

.learn-hero-subtitle {
  color: rgba(255, 255, 255, 0.82);
}

/* ===== STICKY PATH NAV ===== */
.path-nav {
  position: sticky;
  top: 73px;
  z-index: 15;
  background: rgba(233, 241, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(12, 28, 60, 0.08);
}

.path-nav-inner {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding: 12px 0;
  scrollbar-width: thin;
}

.path-nav-link {
  flex: 0 0 auto;
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--ink-soft);
  white-space: nowrap;
  transition: all 0.2s ease;
}

.path-nav-link:hover { background: rgba(27, 95, 214, 0.1); color: var(--navy); }

.path-nav-link.is-active {
  background: var(--navy);
  color: #fff;
}

.pyodide-status {
  text-align: center;
  font-size: 0.85rem;
  color: var(--ink-soft);
  padding: 14px 0 0;
  margin: 0;
}

/* ===== UNIT / TRAIL LAYOUT ===== */
.unit {
  padding: 56px 0;
  scroll-margin-top: 130px;
}

.unit:nth-child(even) { background: rgba(233, 241, 255, 0.5); }

.unit-inner {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 28px;
}

.unit-marker {
  position: relative;
  display: flex;
  justify-content: center;
}

.unit-marker::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: -56px;
  left: 50%;
  width: 3px;
  transform: translateX(-50%);
  background: linear-gradient(180deg, var(--teal), var(--blue));
  opacity: 0.4;
}

.unit:last-of-type .unit-marker::before { display: none; }

.unit-marker span {
  position: relative;
  z-index: 1;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-family: "Outfit", sans-serif;
  font-weight: 700;
  font-size: 1.3rem;
  background: linear-gradient(135deg, var(--blue), var(--teal));
  color: #fff;
  box-shadow: var(--shadow);
}

.unit-body { max-width: 760px; }

.unit-meta {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--blue);
  font-weight: 700;
  margin: 0 0 6px;
}

.unit-title {
  font-family: "Outfit", sans-serif;
  font-size: clamp(1.7rem, 3vw, 2.3rem);
  color: var(--navy);
  margin: 0 0 14px;
}

.unit-body p { margin: 0 0 14px; color: var(--ink); }

.unit-label {
  font-weight: 700;
  color: var(--navy);
  margin: 22px 0 10px;
  font-size: 0.95rem;
}

/* ===== STATIC CODE EXAMPLE ===== */
.code-block {
  background: var(--code-bg);
  color: #e9f1ff;
  border-radius: var(--radius-sm);
  padding: 18px 20px;
  overflow-x: auto;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.88rem;
  line-height: 1.7;
  box-shadow: var(--shadow);
}

.code-block code { background: none; color: inherit; padding: 0; }

/* ===== SANDBOX ===== */
.sandbox {
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow);
  border: 1px solid rgba(233, 241, 255, 0.12);
  background: #071126;
}

.sandbox-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background: #0b1935;
  border-bottom: 1px solid rgba(233, 241, 255, 0.12);
}

.sandbox-filename {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.8rem;
  color: rgba(233, 241, 255, 0.6);
}

.sandbox-run {
  font-family: "Plus Jakarta Sans", sans-serif;
  font-weight: 700;
  font-size: 0.85rem;
  background: var(--gold);
  color: var(--navy);
  border: none;
  padding: 8px 16px;
  border-radius: 999px;
  cursor: pointer;
  transition: transform 0.15s ease;
}

.sandbox-run:hover {
  transform: translateY(-1px);
}

.sandbox-run:disabled {
  opacity: 0.65;
  cursor: progress;
  transform: none;
}

.sandbox-code {
  display: block;
  width: 100%;
  min-height: 160px;
  resize: vertical;
  background: #050d1f;
  color: #e9f1ff;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.88rem;
  line-height: 1.7;
  border: none;
  padding: 18px 20px;
  outline: none;
  tab-size: 4;
}

.sandbox-output {
  background: #08122a;
  color: #7be3d6;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.85rem;
  padding: 14px 20px;
  border-top: 1px solid rgba(233, 241, 255, 0.12);
  white-space: pre-wrap;
  min-height: 44px;
}

.sandbox-output--error {
  color: #ff9d9d;
}
.challenge ul { margin: 8px 0 0; padding-left: 20px; }
.challenge li { margin-bottom: 6px; }

.unit-finish {
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid rgba(12, 28, 60, 0.1);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
}

.unit-finish p { margin: 0; }

@media (max-width: 700px) {
  .unit-inner { grid-template-columns: 44px 1fr; gap: 16px; }
  .unit-marker span { width: 40px; height: 40px; font-size: 1rem; }
  .unit-marker::before { bottom: -32px; }
  .unit { padding: 40px 0; }
  .path-nav { top: 0; }
}