/* DR Dragon - Topics Vocabulary Hub Stylesheet (/topics/) */

.topics-page {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg, 24px);
  max-width: 1080px;
  margin: 0 auto;
  padding-bottom: 48px;
}

/* KPI Summary */
.topics-kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 14px;
}

.topic-kpi-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  border-radius: var(--radius-lg, 14px);
  border: 1px solid var(--line, rgba(0, 0, 0, 0.08));
  background: var(--surface, #ffffff);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.03);
}

/* Toolbar & Filters */
.topics-toolbar {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 18px 20px;
  border-radius: var(--radius-lg, 14px);
  background: var(--surface, #ffffff);
  border: 1px solid var(--line, rgba(0, 0, 0, 0.08));
}

.topics-search-box {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 12px;
  background: var(--bg-subtle, rgba(0, 0, 0, 0.02));
  border: 1px solid var(--line, rgba(0, 0, 0, 0.1));
}

.topics-search-box .icon {
  color: var(--muted, #64748b);
  flex-shrink: 0;
}

.topics-search-input {
  border: none;
  background: transparent;
  width: 100%;
  font-size: 14px;
  color: var(--text, #111827);
  outline: none;
}

.topics-filter-pills {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.topics-pill {
  padding: 7px 14px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  border: 1px solid var(--line, rgba(0, 0, 0, 0.1));
  background: var(--surface, #ffffff);
  color: var(--text, #1e293b);
  cursor: pointer;
  transition: all 0.15s ease;
}

.topics-pill:hover {
  background: rgba(8, 127, 109, 0.06);
  border-color: rgba(8, 127, 109, 0.3);
}

.topics-pill.is-active {
  background: var(--jade, #087f6d);
  border-color: var(--jade, #087f6d);
  color: #ffffff;
}

/* Topics Grid */
.topics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(460px, 1fr));
  gap: 20px;
}

@media (max-width: 640px) {
  .topics-grid {
    grid-template-columns: 1fr;
  }
}

.topic-card {
  display: flex;
  flex-direction: column;
  padding: 22px 24px;
  border-radius: var(--radius-xl, 18px);
  background: var(--surface, #ffffff);
  border: 1px solid var(--line, rgba(0, 0, 0, 0.08));
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.03);
  transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.2s ease, border-color 0.2s ease;
}

.topic-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
  border-color: rgba(8, 127, 109, 0.3);
}

.topic-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.topic-head-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.topic-icon-badge {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: rgba(8, 127, 109, 0.1);
  color: var(--jade, #087f6d);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.topic-py-badge {
  display: block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--jade, #087f6d);
  text-transform: uppercase;
}

.topic-title {
  font-size: 18px;
  font-weight: 800;
  color: var(--text, #111827);
  margin: 2px 0 0 0;
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.topic-hanzi {
  font-size: 16px;
  font-weight: 600;
  color: var(--muted, #64748b);
  font-family: var(--font-chinese, "Noto Serif SC", serif);
}

.topic-word-count {
  font-size: 11px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 8px;
  background: rgba(8, 127, 109, 0.08);
  color: var(--jade, #087f6d);
  white-space: nowrap;
}

.topic-desc {
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted, #64748b);
  margin: 0 0 16px 0;
}

/* Words Preview Chips */
.topic-words-preview {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  gap: 8px;
  margin-bottom: 20px;
  flex: 1;
}

.topic-word-chip {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 8px 6px;
  border-radius: 10px;
  background: var(--bg-subtle, rgba(0, 0, 0, 0.02));
  border: 1px solid var(--line, rgba(0, 0, 0, 0.06));
  cursor: pointer;
  transition: all 0.15s ease;
  text-align: center;
}

.topic-word-chip:hover {
  background: rgba(8, 127, 109, 0.08);
  border-color: rgba(8, 127, 109, 0.25);
  transform: translateY(-1px);
}

.tw-hanzi {
  font-size: 16px;
  font-weight: 700;
  font-family: var(--font-chinese, "Noto Serif SC", serif);
  color: var(--text, #111827);
}

.tw-pinyin {
  font-size: 10px;
  font-weight: 600;
  color: var(--jade, #087f6d);
}

.tw-vi {
  font-size: 10px;
  color: var(--muted, #64748b);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 90px;
}

/* Topic Actions */
.topic-card-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  padding-top: 14px;
  border-top: 1px dashed var(--line, rgba(0, 0, 0, 0.08));
}

/* Dark Mode Overrides */
[data-theme="dark"] .topic-kpi-card,
[data-theme="dark"] .topics-toolbar,
[data-theme="dark"] .topic-card {
  background: var(--surface-dark, #1e293b);
  border-color: var(--line-dark, rgba(255, 255, 255, 0.1));
}

[data-theme="dark"] .topics-pill {
  background: rgba(255, 255, 255, 0.04);
  border-color: rgba(255, 255, 255, 0.1);
}

[data-theme="dark"] .topic-word-chip {
  background: rgba(255, 255, 255, 0.03);
  border-color: rgba(255, 255, 255, 0.06);
}

[data-theme="dark"] .topic-word-chip:hover {
  background: rgba(8, 127, 109, 0.2);
}