/* public/learn.css */
/* Learning path pages styles */

.learn-page {
  background:
    radial-gradient(circle at 20% 10%, rgba(83, 101, 198, 0.12), transparent 50%),
    radial-gradient(circle at 80% 90%, rgba(122, 162, 247, 0.08), transparent 50%),
    var(--bg);
  min-height: 100vh;
}

/* Header */
.learn-header {
  padding: 3rem clamp(2rem, 5vw, 6rem) 2rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  background: linear-gradient(180deg, rgba(24, 27, 35, 0.4), transparent);
}

.learn-breadcrumb {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  margin-bottom: 1.5rem;
  font-size: 0.9rem;
  color: var(--muted);
}

.learn-breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  transition: color 150ms ease;
}

.learn-breadcrumb a:hover {
  color: var(--accent);
}

.learn-breadcrumb span:last-child {
  color: var(--fg);
}

.learn-header h1 {
  font-size: clamp(2.5rem, 4vw, 3.5rem);
  margin: 0 0 1rem;
  font-weight: 800;
}

.learn-header__subtitle {
  font-size: 1.15rem;
  color: var(--muted);
  line-height: 1.6;
  max-width: 800px;
  margin: 0 0 1.5rem;
}

.learn-header__badges {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

/* Layout */
.learn-layout {
  display: grid;
  grid-template-columns: minmax(0, 280px) minmax(0, 1fr);
  gap: 3rem;
  padding: 2rem clamp(2rem, 5vw, 6rem) 4rem;
  max-width: 1600px;
  margin: 0 auto;
  align-items: start;
}

.learn-sidebar {
  position: sticky;
  top: 2rem;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 1.25rem;
  padding: 1.8rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  max-height: calc(100vh - 4rem);
  overflow-y: auto;
}

.learn-sidebar__header h2 {
  margin: 0 0 0.5rem;
  font-size: 1.3rem;
}

.learn-sidebar__header p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--muted);
}

.concept-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.concept-nav-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  border-radius: 0.75rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid transparent;
  color: var(--muted);
  text-decoration: none;
  transition: all 150ms ease;
}

.concept-nav-item:hover {
  background: rgba(122, 162, 247, 0.1);
  border-color: rgba(122, 162, 247, 0.2);
  color: var(--fg);
}

.concept-nav-item--active {
  background: rgba(122, 162, 247, 0.15);
  border-color: rgba(122, 162, 247, 0.35);
  color: var(--fg);
}

.concept-nav-number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: rgba(122, 162, 247, 0.2);
  font-size: 0.85rem;
  font-weight: 600;
  flex-shrink: 0;
}

.concept-nav-item--active .concept-nav-number {
  background: var(--accent);
  color: var(--bg);
}

.concept-nav-label {
  font-size: 0.95rem;
}

.learn-sidebar__footer {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 1rem;
}

.learn-sidebar__footer p {
  margin: 0;
  font-size: 0.9rem;
}

.learn-sidebar__footer a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
}

.learn-sidebar__footer a:hover {
  text-decoration: underline;
}

/* Content */
.learn-content {
  display: flex;
  flex-direction: column;
  gap: 3rem;
}

/* Concept Cards */
.concept-card {
  background: var(--panel-strong);
  border: 1px solid var(--border);
  border-radius: 1.5rem;
  padding: 2.5rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
  box-shadow: var(--shadow);
  scroll-margin-top: 2rem;
}

.concept-card__header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1.5rem;
}

.concept-card__badges {
  margin-bottom: 0.75rem;
}

.concept-card__title {
  margin: 0;
  font-size: 1.8rem;
  font-weight: 700;
}

.concept-card__tagline {
  margin: 0.5rem 0 0;
  font-size: 1.05rem;
  color: var(--muted);
}

.concept-card__explanation h3,
.concept-card__code h3,
.concept-card__key-points h3 {
  margin: 0 0 1rem;
  font-size: 1.15rem;
  font-weight: 600;
}

.concept-card__explanation p {
  margin: 0 0 1rem;
  line-height: 1.7;
  color: #c8cee0;
}

.concept-card__explanation p:last-child {
  margin-bottom: 0;
}

.concept-card__code {
  background: rgba(8, 9, 12, 0.4);
  border-radius: 1.25rem;
  border: 1px solid rgba(255, 255, 255, 0.05);
  padding: 1.8rem;
}

.code-block-wrapper {
  position: relative;
}

.concept-card__key-points ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.key-points-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.key-points-list li {
  position: relative;
  padding-left: 1.8rem;
  line-height: 1.6;
  color: #c5cae4;
}

.key-points-list li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: bold;
  font-size: 1.1em;
}

.concept-card__footer {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 1.5rem;
  display: flex;
  justify-content: center;
}

/* Footer Navigation */
.learn-footer {
  padding: 3rem clamp(2rem, 5vw, 6rem);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  background: linear-gradient(180deg, transparent, rgba(24, 27, 35, 0.3));
}

.learn-footer__nav {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.learn-footer__link {
  padding: 1rem 1.5rem;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 0.9rem;
  color: var(--fg);
  text-decoration: none;
  font-weight: 500;
  transition: all 150ms ease;
}

.learn-footer__link:hover {
  background: rgba(122, 162, 247, 0.1);
  border-color: rgba(122, 162, 247, 0.3);
  transform: translateY(-2px);
}

.learn-footer__link--back {
  margin-right: auto;
}

.learn-footer__link--next {
  margin-left: auto;
}

/* Component: Additional pill variants */
.pill--ok {
  background: rgba(61, 214, 140, 0.15);
  border-color: rgba(61, 214, 140, 0.3);
  color: var(--ok);
}

.pill--accent {
  background: rgba(122, 162, 247, 0.2);
  border-color: rgba(122, 162, 247, 0.4);
  color: var(--accent);
}

.pill--error {
  background: rgba(255, 107, 122, 0.15);
  border-color: rgba(255, 107, 122, 0.3);
  color: var(--error);
}

/* Button size variants */
.button--sm {
  padding: 0.5rem 1rem;
  font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 968px) {
  .learn-layout {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .learn-sidebar {
    position: static;
    max-height: none;
  }

  .concept-card {
    padding: 2rem 1.5rem;
  }

  .learn-footer__nav {
    flex-direction: column;
  }

  .learn-footer__link--back,
  .learn-footer__link--next {
    margin: 0;
  }
}

@media (max-width: 640px) {
  .learn-header {
    padding: 2rem 1.5rem 1.5rem;
  }

  .learn-layout {
    padding: 1.5rem;
  }

  .concept-card {
    padding: 1.5rem;
  }

  .concept-card__code {
    padding: 1.2rem;
  }

  .learn-footer {
    padding: 2rem 1.5rem;
  }
}