/* Learn screen — beginner path (EdClub-style units + micro lessons) */

.learn-body {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  overflow: auto;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 0.5rem;
  max-width: 52rem;
  margin: 0 auto;
  width: 100%;
}

/* NOTE: .learn-bar is the curriculum progress strip in the modes hub — do not reuse. */
.learn-header {
  max-width: 52rem;
  margin: 0 auto 0.65rem !important;
  width: 100%;
  justify-content: space-between !important;
  text-align: left !important;
  flex-direction: row !important;
  align-items: center !important;
  flex-shrink: 0 !important;
  gap: 0.75rem;
  padding: 0.25rem 0 0.35rem !important;
}

.learn-header .screen-title {
  text-align: left !important;
  font-size: 1.45rem !important;
  line-height: 1.15 !important;
  font-weight: 700 !important;
}

.learn-header .screen-sub {
  text-align: left !important;
}

#screen-learn.screen.active {
  display: flex !important;
  flex-direction: column !important;
  min-height: 0;
  overflow: hidden !important;
  padding: 1.15rem 1.25rem 0.5rem !important;
}

#screen-learn .learn-body {
  flex: 1 1 auto;
  min-height: 0;
  overflow: auto;
  -webkit-overflow-scrolling: touch;
}

.learn-intro h2 {
  margin: 0 0 0.65rem;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.learn-principles {
  margin: 0;
  padding-left: 1.15rem;
  display: grid;
  gap: 0.45rem;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.45;
}

.learn-principles strong {
  color: var(--text);
  font-weight: 650;
}

.learn-progress-line {
  margin: 0.85rem 0 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

.learn-path {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.learn-unit {
  background: var(--panel-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 0.9rem 1rem 1rem;
}

.learn-unit-head {
  margin-bottom: 0.75rem;
}

.learn-unit-head h2 {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.learn-unit-head p {
  margin: 0.3rem 0 0;
  color: var(--muted);
  font-size: 0.85rem;
  line-height: 1.4;
}

.learn-lessons {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.learn-lesson {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 0.65rem 0.75rem;
  align-items: center;
  padding: 0.65rem 0.75rem;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--bg);
  cursor: pointer;
  text-align: left;
  font: inherit;
  color: inherit;
  width: 100%;
  transition: border-color 0.12s ease, background 0.12s ease;
}

.learn-lesson:hover:not(:disabled) {
  border-color: color-mix(in srgb, var(--amber) 45%, var(--line));
  background: var(--amber-dim);
}

.learn-lesson:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 2px;
}

.learn-lesson:disabled,
.learn-lesson.locked {
  opacity: 0.55;
  cursor: not-allowed;
}

.learn-lesson.current {
  border-color: color-mix(in srgb, var(--amber) 55%, var(--line));
  background: var(--amber-dim);
  box-shadow: inset 3px 0 0 var(--amber);
}

.learn-lesson.done {
  border-color: color-mix(in srgb, var(--mint) 35%, var(--line));
}

.learn-lesson-num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--faint);
  min-width: 1.6rem;
}

.learn-lesson.done .learn-lesson-num {
  color: var(--mint);
}

.learn-lesson.current .learn-lesson-num {
  color: var(--amber);
}

.learn-lesson-body {
  min-width: 0;
}

.learn-lesson-title {
  display: block;
  font-weight: 650;
  font-size: 0.92rem;
  letter-spacing: -0.01em;
}

.learn-exam-badge {
  display: inline-block;
  margin-left: 0.45rem;
  padding: 0.08rem 0.4rem;
  border-radius: 6px;
  border: 1px solid color-mix(in srgb, var(--amber) 55%, var(--line));
  background: var(--amber-dim);
  color: var(--amber);
  font-family: var(--font-mono);
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  vertical-align: 0.08em;
}

.learn-lesson-keys {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  margin-top: 0.3rem;
}

.learn-key {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 600;
  padding: 0.12rem 0.4rem;
  border-radius: 6px;
  border: 1px solid var(--line);
  background: var(--bg-elev);
  color: var(--muted);
  min-width: 1.2rem;
  text-align: center;
}

.learn-lesson-meta {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--faint);
  white-space: nowrap;
}

.learn-lesson.done .learn-lesson-meta {
  color: var(--mint);
}

.learn-lesson.current .learn-lesson-meta {
  color: var(--amber);
  font-weight: 600;
}

@media (max-width: 560px) {
  .learn-bar {
    flex-wrap: wrap;
    gap: 0.65rem;
  }
  .learn-bar .btn {
    width: 100%;
  }
  .learn-lesson {
    grid-template-columns: auto 1fr;
  }
  .learn-lesson-meta {
    grid-column: 2;
    justify-self: start;
  }
}