/* Learning Corner — redesigned layout */

#lc-welcome[hidden],
#lc-loading[hidden],
#lc-category-detail[hidden],
#lc-error[hidden],
#lc-resource-empty[hidden],
#lc-breadcrumb[hidden],
#lc-back-all[hidden] {
  display: none !important;
}

.lc-page {
  background: var(--bg-grad-warm);
}

/* ── Page hero ───────────────────────────────────────────── */
.lc-page-hero {
  padding: clamp(32px, 5vw, 56px) 0 clamp(28px, 4vw, 40px);
  border-bottom: 1px solid var(--rule);
  background:
    radial-gradient(ellipse 80% 60% at 0% 100%, rgba(93, 44, 181, 0.12), transparent 55%),
    radial-gradient(ellipse 60% 50% at 100% 0%, rgba(50, 55, 240, 0.08), transparent 50%),
    var(--paper);
}

.lc-page-hero__inner {
  max-width: 40rem;
}

.lc-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  margin: 0 0 var(--s-3);
  font-family: var(--ff-mono);
  font-size: var(--fs-small);
  font-weight: 700;
  letter-spacing: var(--ls-caps);
  text-transform: uppercase;
  color: var(--terracotta);
}

.lc-page-hero__title {
  margin: 0 0 var(--s-4);
  font-size: var(--fs-display);
  font-weight: var(--fw-regular);
  line-height: 1.02;
  letter-spacing: var(--ls-display);
  color: var(--ink);
}

.lc-page-hero__title em {
  font-style: italic;
  background: var(--brand-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.lc-page-hero__lede {
  margin: 0;
  max-width: 52ch;
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  color: var(--ink-soft);
}

.lc-hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-3);
  list-style: none;
  margin: var(--s-6) 0 0;
  padding: 0;
}

.lc-hero-stats li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 5.5rem;
  padding: var(--s-3) var(--s-4);
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
  background: var(--paper);
  box-shadow: var(--shadow-1);
}

.lc-hero-stats strong {
  font-family: var(--ff-display);
  font-size: var(--fs-heading);
  font-weight: var(--fw-regular);
  line-height: 1;
  color: var(--terracotta);
}

.lc-hero-stats span {
  font-family: var(--ff-mono);
  font-size: var(--fs-small);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ── Shell & toolbar ─────────────────────────────────────── */
.lc-shell {
  padding: clamp(24px, 4vw, 40px) 0 clamp(48px, 6vw, 80px);
}

.lc-steps {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--s-2);
  margin: 0 0 var(--s-6);
  padding: var(--s-4) 0;
  border-bottom: 1px solid var(--rule);
}

.lc-steps__item {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: var(--fs-small);
  font-weight: 600;
  color: var(--muted);
  text-decoration: none;
  transition: border-color var(--dur-1), color var(--dur-1), background var(--dur-1);
}

a.lc-steps__item:hover {
  border-color: var(--rule);
  color: var(--ink);
  background: var(--paper-soft);
}

.lc-steps__item.is-current {
  border-color: rgba(93, 44, 181, 0.25);
  background: var(--paper);
  color: var(--terracotta);
  box-shadow: var(--shadow-1);
}

.lc-steps__item.is-disabled {
  opacity: 0.45;
  pointer-events: none;
}

.lc-steps__num {
  display: grid;
  place-items: center;
  width: 1.35rem;
  height: 1.35rem;
  border-radius: 50%;
  background: var(--paper-soft);
  font-family: var(--ff-mono);
  font-size: 11px;
  font-weight: 700;
}

.lc-steps__item.is-current .lc-steps__num {
  background: var(--brand-grad);
  color: var(--paper);
}

.lc-steps__sep {
  width: 1rem;
  height: 1px;
  background: var(--rule);
  flex-shrink: 0;
}

.lc-page-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--s-3);
  margin-bottom: var(--s-6);
}

.lc-page-toolbar .lc-breadcrumb {
  flex: 1;
  min-width: 0;
}

.lc-page-toolbar__label {
  margin-left: auto;
  font-family: var(--ff-mono);
  font-size: var(--fs-small);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}

.lc-empty--page {
  margin-top: var(--s-4);
}

.lc-toolbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  flex-direction: column;
  gap: var(--s-3);
  margin: 0 0 var(--s-6);
  padding: var(--s-4) 0;
  background: rgba(250, 248, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
}

.lc-toolbar.is-stuck {
  border-bottom-color: var(--rule);
}

.lc-back-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  width: fit-content;
  padding: 8px 14px;
  border: 1px solid var(--rule);
  border-radius: 999px;
  background: var(--paper);
  color: var(--ink-soft);
  font-size: var(--fs-small);
  font-weight: 600;
  cursor: pointer;
  transition: border-color var(--dur-1), color var(--dur-1), background var(--dur-1);
}

.lc-back-btn:hover {
  border-color: var(--terracotta);
  color: var(--terracotta);
  background: var(--paper-soft);
}

.lc-breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.lc-breadcrumb__item {
  display: inline-flex;
  align-items: center;
  font-family: var(--ff-mono);
  font-size: var(--fs-small);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

.lc-breadcrumb__item:not(:last-child)::after {
  content: "/";
  margin-left: 6px;
  color: var(--rule);
}

.lc-breadcrumb__item:last-child {
  color: var(--terracotta);
}

.lc-breadcrumb__link {
  padding: 2px 4px;
  border-radius: 4px;
  color: inherit;
  cursor: pointer;
  transition: color var(--dur-1), background var(--dur-1);
}

.lc-breadcrumb__link:hover {
  color: var(--terracotta);
  background: var(--paper-soft);
}

.lc-topic-rail-wrap {
  margin: 0 -4px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.lc-topic-rail {
  display: flex;
  gap: var(--s-2);
  padding: 2px 4px 4px;
  min-width: min-content;
}

.lc-topic-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
  padding: 8px 14px 8px 10px;
  border: 1px solid var(--rule);
  border-radius: 999px;
  background: var(--paper);
  color: var(--ink-soft);
  font-size: var(--fs-small);
  font-weight: 600;
  cursor: pointer;
  transition: border-color var(--dur-1), background var(--dur-1), color var(--dur-1), box-shadow var(--dur-1);
}

.lc-topic-pill:hover {
  border-color: rgba(93, 44, 181, 0.35);
  color: var(--ink);
}

.lc-topic-pill.is-active {
  border-color: transparent;
  background: var(--brand-grad);
  color: var(--paper);
  box-shadow: var(--shadow-warm);
}

.lc-topic-pill__icon {
  display: grid;
  place-items: center;
  width: 1.35rem;
  height: 1.35rem;
}

.lc-topic-pill__icon .lc-lucide,
.lc-topic-pill__icon svg {
  width: 1rem;
  height: 1rem;
}

.lc-topic-pill.is-active .lc-topic-pill__icon {
  color: var(--paper);
}

/* ── Section headings ──────────────────────────────────────── */
.lc-section-head {
  margin-bottom: var(--s-6);
}

.lc-section-head__title {
  margin: 0 0 var(--s-2);
  font-size: var(--fs-heading);
  font-weight: var(--fw-regular);
  line-height: var(--lh-tight);
  color: var(--ink);
}

.lc-section-head__sub {
  margin: 0;
  max-width: 50ch;
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  color: var(--muted);
}

/* ── Home topic grid (bento) ───────────────────────────────── */
.lc-topic-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s-4);
}

.lc-topic-card {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: var(--s-4);
  width: 100%;
  padding: var(--s-5);
  border: 1px solid var(--rule);
  border-radius: calc(var(--radius-lg) + 2px);
  background: var(--paper);
  box-shadow: var(--shadow-1);
  text-align: left;
  text-decoration: none;
  color: inherit;
  cursor: pointer;
  transition: transform var(--dur-2) var(--ease-spring), border-color var(--dur-2), box-shadow var(--dur-2);
}

.lc-topic-card:hover {
  color: inherit;
  transform: translateY(-2px);
  border-color: rgba(93, 44, 181, 0.28);
  box-shadow: var(--shadow-2);
}

.lc-topic-card:focus-visible {
  outline: 2px solid var(--terracotta);
  outline-offset: 2px;
}

.lc-topic-card.is-active {
  border-color: var(--terracotta);
  box-shadow: var(--shadow-warm);
}

.lc-topic-card__icon {
  display: grid;
  place-items: center;
  width: 3.25rem;
  height: 3.25rem;
  border-radius: var(--radius-lg);
  background: var(--brand-grad);
  color: var(--paper);
  flex-shrink: 0;
}

.lc-topic-card__icon .lc-lucide,
.lc-topic-card__icon svg {
  width: 1.5rem;
  height: 1.5rem;
}

.lc-topic-card__body {
  display: flex;
  flex-direction: column;
  gap: var(--s-2);
  min-width: 0;
}

.lc-topic-card__name {
  font-size: var(--fs-body);
  font-weight: var(--fw-semibold);
  line-height: var(--lh-snug);
  color: var(--ink);
}

.lc-topic-card__desc {
  font-size: var(--fs-small);
  line-height: 1.5;
  color: var(--muted);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.lc-topic-card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-2);
  font-family: var(--ff-mono);
  font-size: var(--fs-small);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--terracotta);
}

.lc-topic-card__arrow {
  display: grid;
  place-items: center;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 50%;
  background: var(--paper-soft);
  color: var(--terracotta);
  flex-shrink: 0;
  transition: background var(--dur-1), color var(--dur-1);
}

.lc-topic-card:hover .lc-topic-card__arrow {
  background: var(--brand-grad);
  color: var(--paper);
}

/* ── Detail hero panel ─────────────────────────────────────── */
.lc-detail {
  animation: lc-rise 0.28s var(--ease-out);
}

@keyframes lc-rise {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.lc-hero-panel {
  margin-bottom: var(--s-6);
  padding: clamp(var(--s-5), 4vw, var(--s-7));
  border-radius: calc(var(--radius-lg) + 4px);
  border: 1px solid rgba(93, 44, 181, 0.14);
  background:
    linear-gradient(135deg, rgba(93, 44, 181, 0.06) 0%, rgba(50, 55, 240, 0.04) 100%),
    var(--paper);
  box-shadow: var(--shadow-1);
}

.lc-hero-panel__row {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: var(--s-4);
}

.lc-hero-panel__icon {
  display: grid;
  place-items: center;
  width: 3.5rem;
  height: 3.5rem;
  border-radius: var(--radius-lg);
  background: var(--brand-grad);
  color: var(--paper);
  box-shadow: var(--shadow-warm);
  flex-shrink: 0;
}

.lc-hero-panel__icon .lc-lucide,
.lc-hero-panel__icon svg {
  width: 1.65rem;
  height: 1.65rem;
}

.lc-hero-panel__copy {
  flex: 1;
  min-width: min(100%, 16rem);
}

.lc-hero-panel__title {
  margin: 0 0 var(--s-2);
  font-size: var(--fs-heading);
  font-weight: var(--fw-regular);
  line-height: var(--lh-tight);
  color: var(--ink);
}

.lc-hero-panel__badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-bottom: var(--s-3);
  padding: 5px 12px;
  border-radius: 999px;
  background: var(--paper-soft);
  border: 1px solid var(--rule);
  font-family: var(--ff-mono);
  font-size: var(--fs-small);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--terracotta);
}

.lc-hero-panel__desc {
  margin: 0;
  max-width: 60ch;
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  color: var(--ink-soft);
}

.lc-hero-panel__label {
  margin: 0 0 var(--s-3);
  font-family: var(--ff-mono);
  font-size: var(--fs-small);
  font-weight: 700;
  letter-spacing: var(--ls-caps);
  text-transform: uppercase;
  color: var(--muted);
}

/* ── Subtopic grid (in detail) ─────────────────────────────── */
.lc-subtopic-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s-3);
}

.lc-subtopic-card {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: var(--s-4);
  width: 100%;
  padding: var(--s-4) var(--s-5);
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
  background: var(--paper);
  text-align: left;
  text-decoration: none;
  color: inherit;
  cursor: pointer;
  transition: border-color var(--dur-1), box-shadow var(--dur-1), transform var(--dur-1);
}

.lc-subtopic-card:hover {
  border-color: rgba(93, 44, 181, 0.3);
  box-shadow: var(--shadow-1);
  transform: translateX(4px);
  color: inherit;
}

.lc-subtopic-card__icon {
  display: grid;
  place-items: center;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: var(--radius-lg);
  background: var(--brand-grad);
  color: var(--paper);
  flex-shrink: 0;
}

.lc-subtopic-card__icon .lc-lucide,
.lc-subtopic-card__icon svg {
  width: 1.35rem;
  height: 1.35rem;
}

.lc-subtopic-card__body {
  display: flex;
  flex-direction: column;
  gap: var(--s-1);
  min-width: 0;
}

.lc-subtopic-card__name {
  font-size: var(--fs-body);
  font-weight: var(--fw-semibold);
  color: var(--ink);
}

.lc-subtopic-card__desc {
  font-size: var(--fs-small);
  line-height: 1.45;
  color: var(--muted);
}

.lc-subtopic-card__count {
  font-family: var(--ff-mono);
  font-size: var(--fs-small);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  white-space: nowrap;
}

.lc-subtopic-card__arrow {
  display: grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: var(--paper-soft);
  color: var(--terracotta);
  flex-shrink: 0;
  transition: background var(--dur-1), color var(--dur-1);
}

.lc-subtopic-card:hover .lc-subtopic-card__arrow {
  background: var(--brand-grad);
  color: var(--paper);
}

/* ── Resource grid ─────────────────────────────────────────── */
.lc-resource-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s-4);
}

.lc-resource-card {
  display: grid;
  grid-template-columns: minmax(0, 7.5rem) minmax(0, 1fr);
  gap: 0;
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
  background: var(--paper);
  overflow: hidden;
  box-shadow: var(--shadow-1);
  text-decoration: none;
  color: inherit;
  transition: border-color var(--dur-2), box-shadow var(--dur-2), transform var(--dur-2);
}

.lc-resource-card:hover {
  border-color: rgba(93, 44, 181, 0.32);
  box-shadow: var(--shadow-2);
  transform: translateY(-2px);
}

.lc-resource-card__cover {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 100%;
  background: var(--brand-grad-soft);
}

.lc-resource-card__cover img {
  width: 100%;
  height: 100%;
  min-height: 7.5rem;
  object-fit: cover;
  display: block;
}

.lc-resource-card__cover-label {
  font-family: var(--ff-display);
  font-size: var(--fs-body);
  font-weight: var(--fw-semibold);
  color: var(--paper);
  letter-spacing: 0.08em;
}

.lc-resource-card__type-badge {
  position: absolute;
  top: var(--s-2);
  left: var(--s-2);
  padding: 3px 8px;
  border-radius: 999px;
  background: rgba(26, 22, 53, 0.55);
  color: var(--paper);
  font-family: var(--ff-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.lc-resource-card__body {
  display: flex;
  flex-direction: column;
  gap: var(--s-2);
  padding: var(--s-4);
  min-width: 0;
}

.lc-resource-card__tag {
  display: inline-flex;
  width: fit-content;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--paper-coral);
  color: var(--ochre-d);
  font-family: var(--ff-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.lc-resource-card__title {
  margin: 0;
  font-size: var(--fs-body);
  font-weight: var(--fw-semibold);
  line-height: var(--lh-snug);
  color: var(--ink);
}

.lc-resource-card__desc {
  margin: 0;
  font-size: var(--fs-small);
  line-height: 1.55;
  color: var(--muted);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.lc-resource-card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-2);
  margin-top: auto;
  padding-top: var(--s-2);
}

.lc-resource-card__date {
  font-family: var(--ff-mono);
  font-size: var(--fs-small);
  color: var(--muted);
}

.lc-resource-card__link {
  font-size: var(--fs-small);
  font-weight: 600;
  color: var(--terracotta);
}

/* ── Empty & buttons ───────────────────────────────────────── */
.lc-empty {
  padding: var(--s-8) var(--s-5);
  text-align: center;
  border: 1px dashed var(--rule);
  border-radius: var(--radius-lg);
  background: var(--paper-soft);
}

.lc-empty i {
  font-size: 2rem;
  color: var(--terracotta-l);
  opacity: 0.7;
}

.lc-empty h3 {
  margin: var(--s-4) 0 var(--s-2);
  font-size: var(--fs-body);
  font-weight: var(--fw-semibold);
  color: var(--ink);
}

.lc-empty p {
  margin: 0 auto;
  max-width: 36ch;
  font-size: var(--fs-small);
  line-height: 1.6;
  color: var(--muted);
}

.lc-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: var(--s-4);
  padding: 10px 20px;
  border: none;
  border-radius: 999px;
  background: var(--brand-grad);
  color: var(--paper);
  font-size: var(--fs-small);
  font-weight: 600;
  cursor: pointer;
  box-shadow: var(--shadow-warm);
}

.lc-btn:hover {
  filter: brightness(1.05);
}

/* ── Skeletons ─────────────────────────────────────────────── */
.lc-skeleton {
  border-radius: var(--radius);
  background: linear-gradient(90deg, var(--paper-soft) 25%, var(--paper-deep) 50%, var(--paper-soft) 75%);
  background-size: 200% 100%;
  animation: lc-shimmer 1.2s ease-in-out infinite;
}

@keyframes lc-shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.lc-skeleton--icon {
  width: 3.5rem;
  height: 3.5rem;
  border-radius: var(--radius-lg);
}

.lc-skeleton--title {
  width: 55%;
  height: 1.75rem;
  margin-bottom: var(--s-3);
}

.lc-skeleton--line {
  width: 80%;
  height: 0.875rem;
}

.lc-skeleton--tag {
  width: 4rem;
  height: 1rem;
}

.lc-skeleton--cover {
  min-height: 7rem;
}

.lc-skeleton-card {
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--paper);
}

.lc-skeleton-card__body {
  padding: var(--s-4);
  display: grid;
  gap: var(--s-2);
}

/* ── Responsive ──────────────────────────────────────────────── */
@media (min-width: 640px) {
  .lc-topic-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .lc-subtopic-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .lc-resource-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .lc-resource-card {
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr;
  }

  .lc-resource-card__cover img {
    min-height: 9rem;
    width: 100%;
    height: auto;
    object-fit: contain;
  }
}

@media (min-width: 1024px) {
  .lc-topic-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .lc-topic-card:nth-child(3n + 1) {
    grid-column: span 2;
  }

  .lc-resource-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .lc-resource-card {
    grid-template-columns: minmax(0, 8.5rem) minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .lc-detail,
  .lc-topic-card,
  .lc-resource-card,
  .lc-subtopic-card,
  .lc-skeleton {
    animation: none;
    transition: none;
  }
}