/* ============================================================
   Learn Pages — Additional Styles
   ============================================================ */

/* ---------- Learn Header ---------- */
.learn-header {
  text-align: center;
  margin-bottom: 2rem;
}

.learn-badge {
  display: inline-block;
  font-family: var(--sans);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--teal);
  background: rgba(78,205,196,0.12);
  border: 1px solid rgba(78,205,196,0.3);
  border-radius: 999px;
  padding: 0.4rem 1rem;
  margin-bottom: 1rem;
}

.page-subtitle {
  font-family: var(--serif);
  font-size: 1.1rem;
  font-style: italic;
  color: var(--nebula);
  margin-top: 0.5rem;
}

/* ---------- Article Grid ---------- */
.article-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin: 2rem 0;
}

.article-card {
  background: linear-gradient(135deg, rgba(20,20,34,0.4), rgba(15,15,26,0.6));
  border: 1px solid rgba(123,94,167,0.25);
  border-radius: 16px;
  padding: 1.8rem;
  transition: all 0.4s;
  position: relative;
  overflow: hidden;
}

.article-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--indigo), var(--teal));
  opacity: 0;
  transition: opacity 0.4s;
}

.article-card:hover {
  border-color: rgba(78,205,196,0.5);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(78,205,196,0.15);
}

.article-card:hover::before {
  opacity: 1;
}

.article-card__icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  display: inline-block;
  filter: drop-shadow(0 4px 12px rgba(78,205,196,0.3));
}

.article-card__content {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.article-card__number {
  font-family: var(--display);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--teal);
  opacity: 0.8;
}

.article-card__title {
  font-family: var(--display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--ghost);
  margin: 0;
  letter-spacing: 0.04em;
}

.article-card__subtitle {
  font-family: var(--serif);
  font-size: 1rem;
  font-style: italic;
  color: var(--nebula);
  margin: 0;
}

.article-card__desc {
  font-family: var(--sans);
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--silver);
  margin: 0.5rem 0;
}

.article-card__topics {
  list-style: none;
  padding: 0;
  margin: 0.8rem 0;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.article-card__topics li {
  font-family: var(--sans);
  font-size: 0.85rem;
  color: var(--nebula);
  padding-left: 1.2rem;
  position: relative;
}

.article-card__topics li::before {
  content: '·';
  position: absolute;
  left: 0;
  color: var(--teal);
  font-size: 1.2rem;
  line-height: 1;
}

.article-card__link {
  font-family: var(--display);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--teal);
  text-decoration: none;
  margin-top: 0.8rem;
  display: inline-block;
  transition: all 0.3s;
}

.article-card__link:hover {
  color: var(--ghost);
  transform: translateX(4px);
}

/* ---------- Hexagram Grid (64 Hexagrams Page) ---------- */
.hexagram-controls {
  margin: 2rem 0;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.search-box {
  width: 100%;
}

.search-input {
  width: 100%;
  font-family: var(--sans);
  font-size: 0.95rem;
  padding: 0.8rem 1.2rem;
  background: rgba(20,20,34,0.6);
  border: 1px solid rgba(123,94,167,0.3);
  border-radius: 12px;
  color: var(--ghost);
  transition: all 0.3s;
}

.search-input:focus {
  outline: none;
  border-color: var(--teal);
  box-shadow: 0 0 0 3px rgba(78,205,196,0.1);
}

.search-input::placeholder {
  color: var(--nebula);
  opacity: 0.6;
}

.filter-tabs {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.filter-tab {
  font-family: var(--sans);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  padding: 0.6rem 1rem;
  background: rgba(20,20,34,0.4);
  border: 1px solid rgba(123,94,167,0.25);
  border-radius: 8px;
  color: var(--nebula);
  cursor: pointer;
  transition: all 0.3s;
}

.filter-tab:hover {
  border-color: rgba(78,205,196,0.4);
  color: var(--ghost);
}

.filter-tab.is-active {
  background: linear-gradient(120deg, rgba(123,94,167,0.3), rgba(78,205,196,0.2));
  border-color: var(--teal);
  color: var(--ghost);
}

.hexagram-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}

.hexagram-card {
  background: linear-gradient(135deg, rgba(20,20,34,0.5), rgba(15,15,26,0.7));
  border: 1px solid rgba(123,94,167,0.2);
  border-radius: 14px;
  padding: 1.5rem;
  transition: all 0.4s;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.hexagram-card:hover {
  border-color: rgba(78,205,196,0.5);
  transform: translateY(-4px);
  box-shadow: 0 10px 32px rgba(78,205,196,0.12);
}

.hexagram-card__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}

.hexagram-card__number {
  font-family: var(--display);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--teal);
  background: rgba(78,205,196,0.15);
  border-radius: 6px;
  padding: 0.3rem 0.7rem;
}

.hexagram-card__symbol {
  font-size: 2rem;
  color: var(--indigo);
  filter: drop-shadow(0 2px 8px rgba(123,94,167,0.4));
  line-height: 1;
  word-spacing: -0.5em;
  writing-mode: vertical-lr;
  text-orientation: upright;
}

.hexagram-card__name {
  font-family: var(--display);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--ghost);
  margin: 0;
}

.hexagram-card__title {
  font-family: var(--serif);
  font-size: 0.95rem;
  font-style: italic;
  color: var(--nebula);
  margin: 0;
}

.hexagram-card__essence {
  font-family: var(--sans);
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--silver);
  margin: 0.5rem 0;
}

.hexagram-card__tags {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin: 0.8rem 0;
}

.tag {
  font-family: var(--sans);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  padding: 0.3rem 0.7rem;
  border-radius: 6px;
  border: 1px solid;
}

.tag--auspicious {
  color: #4ade80;
  background: rgba(74,222,128,0.1);
  border-color: rgba(74,222,128,0.3);
}

.tag--challenging {
  color: #fb923c;
  background: rgba(251,146,60,0.1);
  border-color: rgba(251,146,60,0.3);
}

.tag--neutral {
  color: var(--nebula);
  background: rgba(165,172,204,0.1);
  border-color: rgba(165,172,204,0.3);
}

.tag--yang {
  color: var(--teal);
  background: rgba(78,205,196,0.1);
  border-color: rgba(78,205,196,0.3);
}

.tag--yin {
  color: var(--indigo);
  background: rgba(123,94,167,0.1);
  border-color: rgba(123,94,167,0.3);
}

.tag--growth,
.tag--learning,
.tag--patience,
.tag--caution {
  color: var(--silver);
  background: rgba(202,210,228,0.08);
  border-color: rgba(202,210,228,0.2);
}

.hexagram-card__link {
  font-family: var(--display);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--teal);
  text-decoration: none;
  margin-top: auto;
  transition: all 0.3s;
}

.hexagram-card__link:hover {
  color: var(--ghost);
  transform: translateX(4px);
}

/* Placeholder for remaining hexagrams */
.hexagram-placeholder {
  grid-column: 1 / -1;
  background: linear-gradient(135deg, rgba(123,94,167,0.08), rgba(78,205,196,0.06));
  border: 2px dashed rgba(123,94,167,0.3);
  border-radius: 16px;
  padding: 3rem 2rem;
  text-align: center;
}

.placeholder-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
  opacity: 0.7;
}

.hexagram-placeholder h4 {
  font-family: var(--display);
  font-size: 1.4rem;
  color: var(--ghost);
  margin: 0 0 1rem;
}

.hexagram-placeholder p {
  font-family: var(--sans);
  font-size: 0.95rem;
  color: var(--silver);
  margin: 0.8rem 0;
}

.hexagram-placeholder ul {
  list-style: none;
  padding: 0;
  margin: 1.5rem auto;
  max-width: 400px;
  text-align: left;
}

.hexagram-placeholder li {
  font-family: var(--sans);
  font-size: 0.9rem;
  color: var(--nebula);
  padding: 0.4rem 0 0.4rem 1.5rem;
  position: relative;
}

.hexagram-placeholder li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--teal);
  font-weight: 700;
}

.placeholder-note {
  font-size: 0.9rem !important;
  color: var(--teal) !important;
  margin-top: 1.5rem !important;
}

.placeholder-note a {
  color: var(--teal);
  text-decoration: underline;
  font-weight: 500;
}

/* ---------- Reference Grid ---------- */
.reference-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.2rem;
  margin: 1.5rem 0;
}

.reference-card {
  background: rgba(78,205,196,0.06);
  border: 1px solid rgba(78,205,196,0.2);
  border-radius: 12px;
  padding: 1.2rem;
}

.reference-card h4 {
  font-family: var(--display);
  font-size: 1rem;
  color: var(--ghost);
  margin: 0 0 0.6rem;
}

.reference-card p {
  font-family: var(--sans);
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--silver);
  margin: 0;
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .article-card {
    padding: 1.4rem;
  }
  
  .article-card__title {
    font-size: 1.3rem;
  }
  
  .hexagram-grid {
    grid-template-columns: 1fr;
  }
  
  .filter-tabs {
    justify-content: center;
  }
  
  .reference-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .learn-badge {
    font-size: 0.7rem;
    padding: 0.35rem 0.8rem;
  }
  
  .article-card__icon {
    font-size: 2rem;
  }
  
  .article-card__title {
    font-size: 1.2rem;
  }
  
  .hexagram-card__symbol {
    font-size: 1.6rem;
  }
}