/* ================================
   FAQ Accordion: Phượng Hoàng V2
   JS: faq.js (critically locked)
   ================================ */

.ph-faq-section {
  padding: var(--ph-space-2xl) 0;
  background: var(--ph-bg-secondary);
}

.ph-faq-container {
  max-width: var(--ph-container-default);
  margin: 0 auto;
  padding: 0 var(--ph-space-sm);
}

@media (min-width: 768px) {
  .ph-faq-container {
    padding: 0 var(--ph-space-md);
  }
}

.ph-faq-header {
  text-align: center;
  margin-bottom: var(--ph-space-lg);
}

.ph-faq-tag {
  display: inline-block;
  padding: var(--ph-space-2xs) var(--ph-space-sm);
  background: var(--ph-accent-subtle);
  color: var(--ph-accent);
  border-radius: var(--ph-radius-full);
  font: var(--ph-text-caption);
  font-weight: 600;
  margin-bottom: var(--ph-space-sm);
}

.ph-faq-title {
  font: var(--ph-text-h2);
  color: var(--ph-text-primary);
  margin-bottom: var(--ph-space-sm);
}

.ph-faq-subtitle {
  font: var(--ph-text-body-lg);
  color: var(--ph-text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* ── Search ── */
.ph-faq-search-wrap {
  position: relative;
  max-width: 480px;
  margin: 0 auto var(--ph-space-md);
}

.ph-faq-search-wrap input {
  width: 100%;
  height: 44px;
  padding: 0 var(--ph-space-sm) 0 44px;
  background: var(--ph-surface-primary);
  border: var(--ph-border-width-medium) solid var(--ph-border-default);
  border-radius: var(--ph-radius-full);
  font: var(--ph-text-body);
  color: var(--ph-text-primary);
  transition: border-color var(--ph-duration-fast) var(--ph-ease-out);
}

.ph-faq-search-wrap input::placeholder {
  color: var(--ph-text-muted);
}

.ph-faq-search-wrap input:focus {
  border-color: var(--ph-border-active);
}

.ph-faq-search-icon {
  position: absolute;
  left: var(--ph-space-sm);
  top: 50%;
  transform: translateY(-50%);
  color: var(--ph-text-muted);
  pointer-events: none;
}

/* ── Filters ── */
.ph-faq-filters {
  display: flex;
  flex-wrap: wrap;
  gap: var(--ph-space-2xs);
  justify-content: center;
  margin-bottom: var(--ph-space-lg);
}

@media (max-width: 767px) {
  .ph-faq-filters {
    flex-wrap: nowrap;
    overflow-x: auto;
    justify-content: flex-start;
    padding-bottom: var(--ph-space-2xs);
  }
}

.ph-faq-filter-btn {
  height: 44px;
  padding: 0 var(--ph-space-sm);
  font: var(--ph-text-caption);
  font-weight: 600;
  background: transparent;
  border: var(--ph-border-width-thin) solid var(--ph-border-default);
  border-radius: var(--ph-radius-full);
  color: var(--ph-text-secondary);
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--ph-duration-fast) var(--ph-ease-out);
}

.ph-faq-filter-btn:hover {
  border-color: var(--ph-border-hover);
  color: var(--ph-text-primary);
}

.ph-faq-filter-btn.active {
  background: var(--ph-accent);
  border-color: var(--ph-accent);
  color: var(--ph-text-inverse);
}

/* ── FAQ List ── */
.ph-faq-list {
  display: flex;
  flex-direction: column;
  gap: var(--ph-space-xs);
}

/* ── FAQ Item ── */
.ph-faq-item {
  background: var(--ph-surface-primary);
  border: var(--ph-border-width-thin) solid var(--ph-border-default);
  border-radius: var(--ph-radius-md);
  overflow: hidden;
  transition: border-color var(--ph-duration-fast) var(--ph-ease-out),
              box-shadow var(--ph-duration-fast) var(--ph-ease-out);
  box-shadow: var(--ph-shadow-inner-highlight);
}
.ph-faq-item:hover {
  border-color: var(--ph-border-hover);
}
.ph-faq-item.open {
  border-color: var(--ph-border-active);
  border-left: 3px solid var(--ph-accent);
  box-shadow: var(--ph-shadow-inner-highlight), 0 0 0 1px var(--ph-accent-subtle);
}

/* ── Question Button ── */
.ph-faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  gap: var(--ph-space-xs);
  padding: var(--ph-space-sm) var(--ph-space-md);
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  font: var(--ph-text-body);
  font-weight: 500;
  color: var(--ph-text-secondary);
  transition: color var(--ph-duration-fast) var(--ph-ease-out),
              background var(--ph-duration-fast) var(--ph-ease-out);
}

.ph-faq-question:hover {
  color: var(--ph-accent);
  background: var(--ph-accent-subtle);
}

.ph-faq-q-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--ph-accent-subtle);
  color: var(--ph-accent);
  font-size: 12px;
  font-weight: 700;
  flex-shrink: 0;
}

.ph-faq-q-text {
  flex: 1;
}

.ph-faq-arrow {
  width: 20px;
  height: 20px;
  color: var(--ph-text-muted);
  flex-shrink: 0;
  transition: transform var(--ph-duration-normal) var(--ph-ease-in-out);
}

.ph-faq-item.open .ph-faq-arrow {
  transform: rotate(180deg);
}

/* ── Answer Panel ── */
.ph-faq-answer {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows var(--ph-duration-normal) var(--ph-ease-out);
}

.ph-faq-answer[hidden] {
  display: grid;
}

.ph-faq-item.open .ph-faq-answer {
  grid-template-rows: 1fr;
}

.ph-faq-answer-inner {
  overflow: hidden;
  padding: 0 var(--ph-space-md) var(--ph-space-md);
  font: var(--ph-text-body-sm);
  color: var(--ph-text-secondary);
  line-height: 1.6;
}

.ph-faq-category-badge {
  display: inline-block;
  margin-top: var(--ph-space-xs);
  padding: var(--ph-space-3xs) var(--ph-space-xs);
  background: var(--ph-accent-subtle);
  color: var(--ph-accent);
  border-radius: var(--ph-radius-full);
  font: var(--ph-text-caption);
}

/* ── No Results ── */
.ph-faq-no-results {
  display: none;
  text-align: center;
  padding: var(--ph-space-xl);
  color: var(--ph-text-muted);
}

.ph-faq-no-results.show {
  display: block;
}

/* ── FAQ CTA ── */
.ph-faq-cta {
  text-align: center;
  margin-top: var(--ph-space-xl);
  padding-top: var(--ph-space-xl);
  border-top: var(--ph-border-width-thin) solid var(--ph-divider);
}

.ph-faq-cta p {
  font: var(--ph-text-body);
  color: var(--ph-text-secondary);
  margin-bottom: var(--ph-space-md);
}

.ph-faq-cta .btn-group {
  justify-content: center;
}