/**
 * Homepage — editorial study hub (not catalog clone)
 */

.home-page .app-main {
  padding-top: var(--space-8);
  padding-bottom: var(--space-16);
}

/* Hero */
.home-hero {
  text-align: center;
  max-width: 42rem;
  margin: 0 auto var(--space-12);
}

.home-hero__greeting {
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-brand-600);
  margin: 0 0 var(--space-2);
  letter-spacing: 0.02em;
}

.home-hero__title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: var(--font-bold);
  letter-spacing: -0.03em;
  color: var(--color-text);
  margin: 0 0 var(--space-3);
  line-height: 1.2;
}

.home-hero__subtitle {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  margin: 0 0 var(--space-8);
  line-height: var(--leading-relaxed);
}

.home-hero__search {
  max-width: 32rem;
  margin: 0 auto var(--space-5);
}

.home-hero__search .search-bar {
  max-width: none;
}

.home-hero__search .search-bar__input {
  padding: var(--space-4) var(--space-5);
  padding-left: 3rem;
  font-size: var(--text-base);
  border-radius: var(--radius-2xl);
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-card);
}

.home-hero__search .search-bar__input:focus {
  border-color: var(--color-brand-500);
  box-shadow: 0 0 0 4px var(--color-brand-50), var(--shadow-card);
}

.home-hero__hint {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin: 0;
}

.home-hero__hint kbd {
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  padding: 0.1em 0.45em;
  border-radius: var(--radius-sm);
  background: var(--color-bg-muted);
  border: 1px solid var(--color-border);
}

/* Continue reading */
.continue-card {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-5);
  margin-bottom: var(--space-10);
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  text-decoration: none;
  color: inherit;
  transition: box-shadow var(--transition-base), border-color var(--transition-base);
}

.continue-card:hover {
  border-color: var(--color-brand-500);
  box-shadow: var(--shadow-card);
  text-decoration: none;
  color: inherit;
}

.continue-card__progress {
  flex-shrink: 0;
  width: 3rem;
  height: 3rem;
  border-radius: var(--radius-full);
  background: conic-gradient(var(--color-brand-600) var(--progress, 0%), var(--color-bg-muted) 0);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.continue-card__progress::after {
  content: '';
  position: absolute;
  inset: 4px;
  border-radius: var(--radius-full);
  background: var(--color-bg-elevated);
}

.continue-card__progress span {
  position: relative;
  z-index: 1;
  font-size: var(--text-xs);
  font-weight: var(--font-bold);
  color: var(--color-brand-600);
}

.continue-card__progress-emoji {
  font-size: 1.25rem;
  font-weight: var(--font-normal);
  line-height: 1;
}

.continue-card__chapter-symbol {
  display: none;
  font-size: 1.5rem;
  line-height: 1;
  margin-right: var(--space-1);
}

.continue-card__body {
  flex: 1;
  min-width: 0;
}

.continue-card__label {
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
  margin: 0 0 var(--space-1);
}

.continue-card__title {
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  color: var(--color-text);
  margin: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.continue-card__meta {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin: var(--space-1) 0 0;
}

.continue-card__action {
  flex-shrink: 0;
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--color-brand-600);
}

/* Section headers */
.home-section {
  margin-bottom: var(--space-10);
}

.home-section__head {
  margin-bottom: var(--space-6);
}

.home-section__title {
  font-size: var(--text-lg);
  font-weight: var(--font-bold);
  color: var(--color-text);
  margin: 0;
  letter-spacing: -0.02em;
}

.home-section__desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin: var(--space-1) 0 0;
}

/* Subject cards grid */
.subject-showcase {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

@media (min-width: 540px) {
  .subject-showcase {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 900px) {
  .subject-showcase {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-5);
  }
}

.subject-card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: var(--space-5) var(--space-5) var(--space-5) var(--space-6);
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  text-decoration: none;
  color: inherit;
  overflow: hidden;
  box-shadow: var(--shadow-xs);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

.subject-card::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--subject-accent, var(--color-brand-600));
  border-radius: var(--radius-xl) 0 0 var(--radius-xl);
}

.subject-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-card-hover);
  text-decoration: none;
  color: inherit;
}

.subject-card--ancient:hover { border-color: #b45309; }
.subject-card--medieval:hover { border-color: #4f46e5; }
.subject-card--modern:hover { border-color: #dc2626; }
.subject-card--art:hover { border-color: #db2777; }
.subject-card--economics:hover { border-color: #059669; }

.subject-card--ancient:hover .subject-card__icon { background: rgba(180, 83, 9, 0.1); color: #b45309; border-color: rgba(180, 83, 9, 0.2); }
.subject-card--medieval:hover .subject-card__icon { background: rgba(79, 70, 229, 0.1); color: #4f46e5; border-color: rgba(79, 70, 229, 0.2); }
.subject-card--modern:hover .subject-card__icon { background: rgba(220, 38, 38, 0.1); color: #dc2626; border-color: rgba(220, 38, 38, 0.2); }
.subject-card--art:hover .subject-card__icon { background: rgba(219, 39, 119, 0.1); color: #db2777; border-color: rgba(219, 39, 119, 0.2); }
.subject-card--economics:hover .subject-card__icon { background: rgba(5, 150, 105, 0.1); color: #059669; border-color: rgba(5, 150, 105, 0.2); }

.subject-card--ancient { --subject-accent: #b45309; }
.subject-card--medieval { --subject-accent: #4f46e5; }
.subject-card--modern { --subject-accent: #dc2626; }
.subject-card--art { --subject-accent: #db2777; }
.subject-card--economics { --subject-accent: #059669; }

.subject-card__top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.subject-card__icon {
  width: 2.75rem;
  height: 2.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-lg);
  background: var(--color-bg-muted);
  border: 1px solid var(--color-border);
  transition: transform var(--transition-fast), background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.subject-card__icon svg {
  width: 1.35rem;
  height: 1.35rem;
}

.subject-card:hover .subject-card__icon {
  transform: scale(1.06);
}

.subject-card__count {
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  color: var(--color-text-muted);
  background: var(--color-bg-muted);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-full);
}

.subject-card__title {
  font-size: var(--text-lg);
  font-weight: var(--font-bold);
  color: var(--color-text);
  margin: 0 0 var(--space-2);
  letter-spacing: -0.02em;
}

.subject-card__desc {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin: 0;
  line-height: var(--leading-relaxed);
  flex: 1;
}

.subject-card__cta {
  margin-top: var(--space-4);
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--color-brand-600);
}

/* Explore row */
.explore-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

@media (min-width: 640px) {
  .explore-row {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-5);
  }
}

.explore-card {
  display: flex;
  flex-direction: column;
  padding: var(--space-6);
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border);
  background: var(--color-bg-elevated);
  text-decoration: none;
  color: inherit;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.explore-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  text-decoration: none;
  color: inherit;
}

.explore-card--guide {
  background: linear-gradient(145deg, var(--color-bg-elevated) 0%, var(--color-cat-guide-bg) 100%);
  border-color: rgba(124, 58, 237, 0.2);
}

.explore-card--pyq {
  background: linear-gradient(145deg, var(--color-bg-elevated) 0%, var(--color-cat-pyq-bg) 100%);
  border-color: rgba(234, 88, 12, 0.2);
}

.explore-card__tag {
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-2);
}

.explore-card--guide .explore-card__tag { color: var(--color-cat-guide); }
.explore-card--pyq .explore-card__tag { color: var(--color-cat-pyq); }

.explore-card__title {
  font-size: var(--text-xl);
  font-weight: var(--font-bold);
  margin: 0 0 var(--space-2);
  letter-spacing: -0.02em;
}

.explore-card__desc {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin: 0;
  line-height: var(--leading-relaxed);
  flex: 1;
}

.explore-card__link {
  margin-top: var(--space-4);
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--color-brand-600);
}