.page-faq {
  background:
    radial-gradient(1100px 520px at 88% -8%, rgba(0, 200, 255, 0.14), transparent 60%),
    radial-gradient(900px 480px at 0% 24%, rgba(0, 255, 163, 0.06), transparent 55%),
    linear-gradient(180deg, #0b0f1a 0%, #0e1424 100%);
  color: var(--paper);
}

/* ===== Hero 区 ===== */
.faq-hero {
  position: relative;
  padding: 56px 0 60px;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}
.faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 44px 44px;
  -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.8), transparent 92%);
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.8), transparent 92%);
  pointer-events: none;
}
.faq-hero__inner {
  display: grid;
  gap: 36px;
  align-items: end;
  position: relative;
  z-index: 1;
}
.faq-hero__main {
  position: relative;
}
.faq-hero__title {
  max-width: 820px;
  font-size: clamp(38px, 6.5vw, 66px);
  line-height: 1.12;
  letter-spacing: -0.035em;
  margin-top: 10px;
  margin-bottom: 18px;
}
.faq-hero__title span {
  color: var(--neutron);
}
.faq-hero__lead {
  max-width: 660px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--muted);
  margin: 0;
}
.faq-hero__aside {
  display: grid;
  gap: 14px;
}
.faq-stat-card {
  position: relative;
  overflow: hidden;
  background: var(--glass);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 24px;
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
}
.faq-stat-card::after {
  content: "";
  position: absolute;
  right: -30px;
  top: -30px;
  width: 90px;
  height: 90px;
  border-radius: 50%;
  background: rgba(0, 200, 255, 0.1);
  pointer-events: none;
}
.faq-stat-card--green {
  border-color: rgba(0, 255, 163, 0.4);
  background: rgba(0, 255, 163, 0.06);
}
.faq-stat-card--green::after {
  background: rgba(0, 255, 163, 0.12);
}
.faq-stat-card__label {
  display: block;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--muted);
  text-transform: uppercase;
}
.faq-stat-card__value {
  display: block;
  font-family: var(--font-mono);
  font-size: 34px;
  font-weight: 500;
  line-height: 1.2;
  color: var(--paper);
  margin-top: 6px;
}
.faq-stat-card__value .data-number {
  color: var(--pulse);
}
.faq-stat-card--green .faq-stat-card__value .data-number {
  color: var(--neutron);
}
.faq-stat-card__desc {
  display: block;
  font-size: 13px;
  color: var(--muted);
  margin-top: 4px;
}
.page-faq .breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 30px;
  font-size: 13px;
  color: var(--muted);
}
.page-faq .breadcrumb-link {
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}
.page-faq .breadcrumb-link:hover {
  color: var(--pulse);
}
.page-faq .breadcrumb-current {
  color: var(--paper);
}

/* ===== FAQ 主体布局 ===== */
.faq-qa {
  padding: 64px 0 72px;
}
.faq-qa__layout {
  display: grid;
  gap: 36px;
  align-items: start;
}

/* ===== 侧边栏 ===== */
.faq-sidebar__inner {
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.faq-sidebar__panel {
  background: var(--glass);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}
.faq-sidebar__heading {
  font-size: 18px;
  font-weight: 800;
  color: var(--paper);
  margin: 0 0 4px;
}
.faq-sidebar__sub {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.7;
  margin: 0 0 16px;
}
.faq-category {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.page-faq .filter-button {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 11px 16px;
  border-radius: 999px;
  background: var(--panel);
  border: 1px solid var(--line);
  color: var(--paper);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.25s var(--ease);
}
.page-faq .filter-button:hover {
  border-color: var(--pulse);
  color: var(--pulse);
  transform: translateX(2px);
}
.page-faq .filter-button.is-active {
  background: rgba(0, 255, 163, 0.12);
  border-color: var(--neutron);
  color: var(--neutron);
  box-shadow: 0 0 20px rgba(0, 255, 163, 0.12);
}
.page-faq .filter-button .data-number {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
  margin-left: auto;
}
.page-faq .filter-button.is-active .data-number {
  color: var(--neutron);
}
.page-faq .filter-button:focus-visible {
  outline: 2px solid var(--pulse);
  outline-offset: 2px;
}
.faq-cat-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  opacity: 0.85;
}
.faq-tip-card {
  background: linear-gradient(135deg, rgba(0, 200, 255, 0.08), rgba(20, 29, 51, 0.5));
  border: 1px solid rgba(0, 200, 255, 0.22);
  border-radius: var(--radius);
  padding: 20px;
}
.faq-tip-card__title {
  font-size: 16px;
  font-weight: 800;
  color: var(--paper);
  margin: 8px 0 8px;
}
.faq-tip-card p {
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
  margin: 0 0 14px;
}

/* ===== 右侧面板 ===== */
.faq-panels {
  min-width: 0;
}
.faq-panels__head {
  margin-bottom: 22px;
}
.faq-panels__head .section-title {
  font-size: 28px;
  font-weight: 900;
  letter-spacing: -0.02em;
  margin: 4px 0 10px;
}
.faq-panels__hint {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  font-size: 13px;
  color: var(--muted);
}
.faq-panels__hint svg {
  flex-shrink: 0;
  opacity: 0.7;
}

/* ===== 手风琴 ===== */
.faq-accordion {
  display: grid;
  gap: 14px;
}
.faq-accordion-item {
  background: rgba(20, 29, 51, 0.72);
  border: 1px solid var(--line);
  border-radius: var(--radius-s);
  overflow: hidden;
  transition: border-color 0.25s var(--ease), background 0.25s var(--ease), box-shadow 0.25s var(--ease);
}
.faq-accordion-item[hidden] {
  display: none;
}
.faq-accordion-item[open] {
  background: rgba(13, 20, 36, 0.92);
  border-color: rgba(0, 255, 163, 0.38);
  box-shadow: 0 0 24px rgba(0, 255, 163, 0.06);
}
.faq-accordion-item__summary {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 18px;
  cursor: pointer;
  list-style: none;
  -webkit-user-select: none;
  user-select: none;
  transition: background 0.2s var(--ease);
}
.faq-accordion-item__summary::-webkit-details-marker {
  display: none;
}
.faq-accordion-item__summary:hover {
  background: rgba(255, 255, 255, 0.02);
}
.faq-accordion-item__summary:focus-visible {
  outline: 2px solid var(--pulse);
  outline-offset: -2px;
}
.faq-accordion-item__index {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  color: var(--pulse);
  flex-shrink: 0;
  line-height: 1;
}
.faq-accordion-item[open] .faq-accordion-item__index {
  color: var(--neutron);
}
.faq-accordion-item__title {
  flex: 1;
  min-width: 0;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper);
}
.faq-accordion-item__icon {
  position: relative;
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}
.faq-accordion-item__icon::before,
.faq-accordion-item__icon::after {
  content: "";
  position: absolute;
  background: var(--muted);
  transition: background 0.2s var(--ease), transform 0.3s var(--ease);
}
.faq-accordion-item__icon::before {
  top: 7px;
  left: 0;
  width: 16px;
  height: 2px;
}
.faq-accordion-item__icon::after {
  left: 7px;
  top: 0;
  width: 2px;
  height: 16px;
}
.faq-accordion-item[open] .faq-accordion-item__icon::before,
.faq-accordion-item[open] .faq-accordion-item__icon::after {
  background: var(--neutron);
}
.faq-accordion-item[open] .faq-accordion-item__icon::after {
  transform: scaleY(0);
}
.faq-accordion-item__content {
  padding: 0 18px 20px;
}
.faq-accordion-item__content p {
  font-size: 14px;
  line-height: 1.85;
  color: var(--muted);
  margin: 0 0 10px;
}
.faq-accordion-item__content p:last-child {
  margin-bottom: 0;
}
.faq-accordion-item__content a {
  color: var(--neutron);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 255, 163, 0.35);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.faq-accordion-item__content a:hover {
  color: var(--pulse);
  border-color: var(--pulse);
}

/* ===== 手风琴内图片 ===== */
.faq-figure {
  margin: 20px 0 4px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-s);
  overflow: hidden;
}
.faq-figure .image-cover {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}
.faq-figure figcaption {
  padding: 10px 14px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
  border-top: 1px solid var(--line);
  background: rgba(11, 15, 26, 0.5);
}

/* ===== 联系我们 ===== */
.faq-contact-section {
  padding-bottom: 88px;
}
.faq-contact-card {
  position: relative;
  display: grid;
  gap: 28px;
  background:
    linear-gradient(135deg, rgba(0, 200, 255, 0.09), rgba(20, 29, 51, 0.5) 55%),
    var(--panel);
  border: 1px solid rgba(0, 200, 255, 0.22);
  border-radius: var(--radius);
  padding: 30px;
  overflow: hidden;
}
.faq-contact-card::before {
  content: "";
  position: absolute;
  top: -80px;
  right: -80px;
  width: 240px;
  height: 240px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 255, 163, 0.12), transparent 65%);
  pointer-events: none;
}
.faq-contact-card__info {
  position: relative;
  z-index: 1;
}
.faq-contact-card__info .section-title {
  font-size: 26px;
  font-weight: 900;
  margin: 6px 0 10px;
}
.faq-contact-card__info > p:first-of-type {
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
  margin: 0 0 18px;
}
.faq-contact-card__note {
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
  margin: 14px 0 18px;
}
.page-faq .contact-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}
.page-faq .contact-label {
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}
.page-faq .contact-value {
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--paper);
}
.faq-contact-card__badge {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  border: 1px dashed rgba(255, 215, 0, 0.4);
  background: rgba(255, 215, 0, 0.04);
  border-radius: var(--radius);
  padding: 24px 16px;
  text-align: center;
  position: relative;
  z-index: 1;
}
.faq-contact-card__badge .data-number {
  font-size: 42px;
  font-weight: 500;
  line-height: 1;
  color: var(--gold);
}
.faq-contact-card__badge strong {
  font-size: 15px;
  font-weight: 800;
  color: var(--paper);
}
.faq-contact-card__badge span:last-child {
  font-size: 12px;
  color: var(--muted);
}

/* ===== 桌面端 ===== */
@media (min-width: 992px) {
  .faq-hero {
    padding: 64px 0 72px;
  }
  .faq-hero__inner {
    grid-template-columns: 1fr 340px;
    gap: 48px;
  }
  .faq-hero__title {
    font-size: clamp(44px, 5vw, 64px);
  }
  .faq-qa {
    padding: 76px 0 88px;
  }
  .faq-qa__layout {
    grid-template-columns: 288px minmax(0, 1fr);
    gap: 56px;
  }
  .faq-sidebar__inner {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }
  .faq-category {
    flex-direction: column;
    gap: 8px;
  }
  .page-faq .filter-button {
    width: 100%;
    justify-content: flex-start;
    border-radius: 12px;
    padding: 12px 14px;
  }
  .faq-accordion-item__summary {
    padding: 20px 22px;
    gap: 16px;
  }
  .faq-accordion-item__content {
    padding: 0 22px 22px 66px;
  }
  .faq-accordion-item__title {
    font-size: 16px;
  }
  .faq-contact-section {
    padding-bottom: 104px;
  }
  .faq-contact-card {
    grid-template-columns: 1fr 240px;
    padding: 44px 48px;
  }
  .faq-contact-card__badge {
    align-self: stretch;
  }
}