/* Vocab Tips Hub Styling (Mẹo Nhớ Từ Vựng Tiếng Trung) */

.vt-hub-page {
  padding-bottom: 4rem;
}

.vt-hero-section {
  text-align: center;
  margin: 1.5rem auto 2.5rem;
  max-width: 860px;
}

.vt-hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--gold-50, #fffbeb);
  color: var(--gold-700, #b45309);
  border: 1px solid var(--gold-200, #fde68a);
  border-radius: 9999px;
  padding: 0.35rem 1rem;
  font-size: 0.8125rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.vt-hero-title {
  font-size: clamp(1.85rem, 4vw, 2.75rem);
  font-weight: 900;
  color: var(--ink-900, #0f172a);
  line-height: 1.25;
  margin-bottom: 1rem;
}

.vt-hero-subtitle {
  font-size: 1.05rem;
  color: var(--ink-600, #475569);
  line-height: 1.6;
  margin-bottom: 2rem;
}

.vt-hero-subtitle strong {
  color: var(--jade-600, #059669);
}

.vt-kpi-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-top: 1.5rem;
}

@media (min-width: 640px) {
  .vt-kpi-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.vt-kpi-card {
  background: var(--surface, #ffffff);
  border: 2px solid var(--ink-100, #e2e8f0);
  border-radius: 1rem;
  padding: 1rem;
  text-align: center;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.03);
}

.vt-kpi-num {
  display: block;
  font-size: 1.75rem;
  font-weight: 900;
  color: var(--gold-600, #d97706);
  line-height: 1.2;
}

.vt-kpi-label {
  display: block;
  font-size: 0.8125rem;
  color: var(--ink-500, #64748b);
  font-weight: 600;
  margin-top: 0.25rem;
}

.vt-quick-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.25rem 1.5rem;
  border-radius: 1.25rem;
  margin-bottom: 2.5rem;
  border: 2px solid var(--jade-200, #a7f3d0);
  background: linear-gradient(135deg, #ffffff 0%, #ecfdf5 100%);
}

.vt-actions-text strong {
  color: var(--jade-800, #065f46);
  font-size: 0.9375rem;
}

.vt-actions-btns {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.vt-btn-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1rem;
  border-radius: 0.75rem;
  font-size: 0.875rem;
  font-weight: 700;
  text-decoration: none;
}

.vt-btn-icon {
  width: 15px;
  height: 15px;
}

/* Tips Stack */
.vt-tips-stack {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.vt-tip-card {
  background: var(--surface, #ffffff);
  border: 2px solid var(--ink-100, #e2e8f0);
  border-radius: 1.5rem;
  padding: 1.75rem;
  box-shadow: 0 4px 12px -2px rgba(0, 0, 0, 0.05);
}

.vt-tip-header {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.vt-tip-num-badge {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 1rem;
  background: var(--jade-50, #ecfdf5);
  color: var(--jade-700, #047857);
  border: 2px solid var(--jade-200, #a7f3d0);
  font-size: 1.35rem;
  font-weight: 900;
  flex-shrink: 0;
}

.vt-tip-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--ink-900, #0f172a);
  margin: 0 0 0.25rem;
  line-height: 1.3;
}

.vt-tip-tagline {
  font-size: 0.9375rem;
  color: var(--jade-600, #059669);
  font-weight: 600;
  margin: 0;
}

.vt-tip-desc {
  font-size: 0.95rem;
  color: var(--ink-700, #334155);
  line-height: 1.6;
  margin-bottom: 1.25rem;
}

/* Demo Boxes & Widgets */
.vt-demo-box {
  background: var(--ink-50, #f8fafc);
  border: 1px solid var(--ink-200, #cbd5e1);
  border-radius: 1rem;
  padding: 1.25rem;
  margin-top: 1rem;
}

.vt-demo-title {
  font-size: 0.8125rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--ink-500, #64748b);
  margin-bottom: 1rem;
}

.vt-demo-grid {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.vt-demo-item {
  background: #ffffff;
  border: 1px solid var(--ink-100, #e2e8f0);
  border-radius: 0.875rem;
  padding: 0.875rem;
}

.vt-radical-pill {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 800;
  color: var(--jade-700, #047857);
  background: var(--jade-50, #ecfdf5);
  padding: 0.2rem 0.6rem;
  border-radius: 0.375rem;
  margin-bottom: 0.6rem;
}

.vt-chars-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.vt-char-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: #ffffff;
  border: 1.5px solid var(--ink-200, #cbd5e1);
  border-radius: 0.75rem;
  padding: 0.4rem 0.75rem;
  cursor: pointer;
  transition: all 0.15s ease;
}

.vt-char-btn:hover {
  border-color: var(--jade-400, #34d399);
  background: var(--jade-50, #ecfdf5);
  transform: translateY(-2px);
}

.vt-char-han {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--ink-900, #0f172a);
}

.vt-char-py {
  font-size: 0.8125rem;
  color: var(--jade-600, #059669);
  font-weight: 600;
}

.vt-demo-hint {
  font-size: 0.8125rem;
  color: var(--ink-500, #64748b);
  margin: 0.875rem 0 0;
  font-style: italic;
}

/* Breakdown Cards (Hình thanh) */
.vt-breakdown-card {
  flex: 1;
  min-width: 140px;
  background: #ffffff;
  border: 1.5px solid var(--jade-200, #a7f3d0);
  border-radius: 0.875rem;
  padding: 0.875rem;
  display: flex;
  flex-direction: column;
}

.vt-breakdown-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.25rem;
}

.vt-breakdown-char {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--jade-700, #047857);
}

.vt-breakdown-py {
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--ink-800, #1e293b);
  margin-bottom: 0.25rem;
}

.vt-breakdown-formula {
  font-size: 0.75rem;
  color: var(--ink-500, #64748b);
}

.vt-icon-sm {
  width: 13px;
  height: 13px;
}

/* Compounds Grid */
.vt-compounds-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
}

@media (min-width: 640px) {
  .vt-compounds-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.vt-compound-chip {
  background: #ffffff;
  border: 1.5px solid var(--gold-200, #fde68a);
  border-radius: 0.875rem;
  padding: 0.875rem;
  display: flex;
  flex-direction: column;
  text-align: center;
}

.vt-comp-han {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--ink-900, #0f172a);
}

.vt-comp-py {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--gold-700, #b45309);
  margin: 0.2rem 0;
}

.vt-comp-vi {
  font-size: 0.75rem;
  color: var(--ink-600, #475569);
}

/* Stories Grid */
.vt-stories-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

@media (min-width: 640px) {
  .vt-stories-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.vt-story-card {
  background: var(--ink-50, #f8fafc);
  border: 1px solid var(--ink-200, #cbd5e1);
  border-radius: 1rem;
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.vt-story-char {
  font-size: 2.75rem;
  font-weight: 800;
  color: var(--gold-600, #d97706);
  line-height: 1;
}

.vt-story-content strong {
  display: block;
  font-size: 0.9375rem;
  color: var(--ink-800, #1e293b);
  margin-bottom: 0.25rem;
}

.vt-story-content p {
  font-size: 0.8125rem;
  color: var(--ink-600, #475569);
  line-height: 1.5;
  margin: 0;
}

/* SRS Timeline */
.vt-srs-timeline {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.5rem;
  background: var(--ink-50, #f8fafc);
  padding: 1.25rem 0.75rem;
  border-radius: 1rem;
  margin-top: 1rem;
  text-align: center;
}

.vt-step-dot {
  display: block;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--jade-300, #6ee7b7);
  margin: 0 auto 0.5rem;
}

.vt-step-dot.active {
  background: var(--gold-500, #f59e0b);
  box-shadow: 0 0 0 4px rgba(245, 158, 11, 0.2);
}

.vt-step-label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 800;
  color: var(--ink-800, #1e293b);
}

.vt-step-sub {
  display: block;
  font-size: 0.6875rem;
  color: var(--ink-500, #64748b);
  margin-top: 0.2rem;
}

/* FAQ */
.vt-faq-card {
  margin-top: 3rem;
  padding: 2rem;
  border-radius: 1.5rem;
}

.vt-faq-heading {
  font-size: 1.35rem;
  font-weight: 900;
  color: var(--ink-900, #0f172a);
  margin-bottom: 1.25rem;
}

/* Dark mode */
[data-theme="dark"] .vt-tip-card {
  background: #1e293b;
  border-color: #334155;
}

[data-theme="dark"] .vt-demo-box {
  background: #0f172a;
  border-color: #334155;
}

[data-theme="dark"] .vt-demo-item {
  background: #1e293b;
  border-color: #334155;
}

[data-theme="dark"] .vt-char-btn {
  background: #1e293b;
  border-color: #334155;
}

[data-theme="dark"] .vt-breakdown-card {
  background: #1e293b;
  border-color: rgba(5, 150, 105, 0.4);
}

[data-theme="dark"] .vt-compound-chip {
  background: #1e293b;
  border-color: rgba(217, 119, 6, 0.4);
}

[data-theme="dark"] .vt-story-card {
  background: #0f172a;
  border-color: #334155;
}

[data-theme="dark"] .vt-srs-timeline {
  background: #0f172a;
}