/* ===== 常见问答页专属样式 ===== */
.page-faq {
  --faq-index-width: 250px;
  --faq-gap: clamp(24px, 3vw, 48px);
  background-color: var(--color-bg-deep);
  background-image:
    linear-gradient(rgba(77, 208, 225, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(77, 208, 225, 0.05) 1px, transparent 1px);
  background-size: 44px 44px;
}

.page-faq img {
  max-width: 100%;
  height: auto;
}

.page-faq .faq-section[id] {
  scroll-margin-top: 140px;
}

/* ===== Hero ===== */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(48px, 7vw, 96px) 0 clamp(40px, 6vw, 72px);
  overflow: hidden;
}

.page-faq .faq-hero::before {
  content: "FAQ";
  position: absolute;
  top: 0.1em;
  right: -0.06em;
  font-family: var(--font-heading);
  font-size: clamp(96px, 16vw, 220px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.05em;
  color: transparent;
  -webkit-text-stroke: 1px rgba(77, 208, 225, 0.16);
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: var(--gradient-progress);
  opacity: 0.65;
}

.page-faq .faq-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
}

.page-faq .faq-hero__eyebrow {
  margin: 0 0 10px;
  font-family: var(--font-editorial);
  font-style: italic;
  font-size: 1rem;
  color: var(--color-accent-lime);
  letter-spacing: 0.04em;
}

.page-faq .faq-hero__title {
  margin: 0 0 18px;
  max-width: 15ch;
  font-family: var(--font-heading);
  font-size: clamp(2.25rem, 6vw, 4rem);
  line-height: 1.06;
  letter-spacing: -0.03em;
  color: var(--color-text-main);
}

.page-faq .faq-hero__desc {
  margin: 0;
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--color-text-sub);
}

.page-faq .faq-hero__search {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 18px;
  background: var(--color-bg-panel);
  border: 1px solid var(--color-border);
  clip-path: polygon(12px 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%, 0 12px);
}

.page-faq .faq-hero__search-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent-orange);
}

.page-faq .faq-hero__search-text {
  flex: 1;
  min-width: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-size: 0.875rem;
  color: var(--color-text-sub);
}

.page-faq .faq-hero__search-kbd {
  flex: 0 0 auto;
  padding: 3px 8px;
  border: 1px solid var(--color-border-light);
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-sub);
}

/* ===== 主体双栏布局 ===== */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--faq-gap);
  padding-bottom: clamp(56px, 8vw, 96px);
}

/* ===== 左侧索引 ===== */
.page-faq .faq-index {
  margin-bottom: 8px;
}

.page-faq .faq-index__inner {
  position: static;
}

.page-faq .faq-index__label {
  margin: 0 0 14px;
  font-family: var(--font-heading);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent-orange);
}

.page-faq .faq-index__nav {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  scrollbar-width: none;
  padding-bottom: 4px;
}

.page-faq .faq-index__nav::-webkit-scrollbar {
  display: none;
}

.page-faq .faq-index__link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  font-family: var(--font-heading);
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--color-text-sub);
  text-decoration: none;
  border: 1px solid var(--color-border-light);
  background: rgba(17, 27, 45, 0.72);
  clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
  transition:
    color var(--transition-fast),
    border-color var(--transition-fast),
    background var(--transition-fast);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  color: var(--color-accent-lime);
  border-color: rgba(163, 255, 18, 0.4);
  background: rgba(23, 32, 58, 0.9);
  outline: none;
}

.page-faq .faq-index__num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-accent-orange);
}

.page-faq .faq-index__meta {
  display: none;
  margin-top: 20px;
  padding: 14px 16px;
  border: 1px solid var(--color-border-light);
  background: var(--gradient-accent);
  clip-path: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
}

.page-faq .faq-index__meta-label {
  display: block;
  font-family: var(--font-editorial);
  font-style: italic;
  font-size: 0.875rem;
  color: var(--color-text-sub);
}

.page-faq .faq-index__meta-value {
  display: block;
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--color-accent-lime);
}

/* ===== 右侧问答 ===== */
.page-faq .faq-content {
  min-width: 0;
}

.page-faq .faq-section {
  padding: 32px 0 40px;
  border-bottom: 1px solid var(--color-border-light);
}

.page-faq .faq-section:target {
  border-left: 2px solid var(--color-accent-lime);
  padding-left: 16px;
}

.page-faq .faq-section:first-child {
  padding-top: 0;
}

.page-faq .faq-section__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.page-faq .faq-section__no {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--color-accent-orange);
}

.page-faq .faq-section__title {
  margin: 0;
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 3vw, 2.125rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--color-text-main);
}

.page-faq .faq-section__lead {
  margin: 8px 0 0;
  max-width: 62ch;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--color-text-sub);
}

/* ===== 图片与图注 ===== */
.page-faq .faq-figure {
  margin: 28px 0;
}

.page-faq .faq-figure__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--color-border-light);
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 24px 100%, 0 calc(100% - 24px));
}

.page-faq .faq-figure__cap {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.03em;
  color: var(--color-text-sub);
}

/* ===== 历史交锋区左右布局 ===== */
.page-faq .faq-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  margin-top: 28px;
}

.page-faq .faq-split__main {
  min-width: 0;
}

.page-faq .faq-figure--side {
  margin: 0;
}

.page-faq .faq-figure--side .faq-figure__img {
  max-width: 220px;
  width: 100%;
  height: auto;
}

/* ===== 手风琴问答 ===== */
.page-faq .faq-qa {
  margin: 16px 0;
  border: 1px solid var(--color-border-light);
  background: linear-gradient(135deg, rgba(255, 122, 0, 0.05), rgba(163, 255, 18, 0.02));
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 18px 100%, 0 calc(100% - 18px));
  transition:
    border-color var(--transition-fast),
    background var(--transition-fast);
}

.page-faq .faq-qa:hover {
  border-color: rgba(163, 255, 18, 0.35);
  background: linear-gradient(135deg, rgba(255, 122, 0, 0.09), rgba(163, 255, 18, 0.04));
}

.page-faq .faq-qa[open] {
  border-color: rgba(163, 255, 18, 0.3);
  background: linear-gradient(135deg, rgba(255, 122, 0, 0.1), rgba(163, 255, 18, 0.05));
}

.page-faq .faq-qa__q {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 18px;
  list-style: none;
  cursor: pointer;
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.5;
  color: var(--color-text-main);
  transition: color var(--transition-fast);
}

.page-faq .faq-qa__q::-webkit-details-marker {
  display: none;
}

.page-faq .faq-qa__q:hover,
.page-faq .faq-qa__q:focus-visible {
  color: var(--color-accent-lime);
  outline: none;
}

.page-faq .faq-qa__q:focus-visible {
  box-shadow: inset 0 0 0 2px rgba(163, 255, 18, 0.35);
}

.page-faq .faq-qa__icon {
  flex: 0 0 28px;
  width: 28px;
  height: 28px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-accent-orange);
  border: 1px solid rgba(255, 122, 0, 0.5);
  clip-path: polygon(4px 0, 100% 0, 100% calc(100% - 4px), calc(100% - 4px) 100%, 0 100%, 0 4px);
}

.page-faq .faq-qa__text {
  flex: 1;
  min-width: 0;
  overflow-wrap: break-word;
}

.page-faq .faq-qa__clock {
  flex: 0 0 16px;
  width: 16px;
  height: 16px;
  color: var(--color-accent-orange);
  opacity: 0.9;
}

.page-faq .faq-qa__toggle {
  position: relative;
  flex: 0 0 16px;
  width: 16px;
  height: 16px;
  margin-left: auto;
}

.page-faq .faq-qa__toggle::before,
.page-faq .faq-qa__toggle::after {
  content: "";
  position: absolute;
  background: var(--color-text-sub);
  transition:
    transform var(--transition-fast),
    background var(--transition-fast);
}

.page-faq .faq-qa__toggle::before {
  top: 7px;
  left: 0;
  width: 16px;
  height: 2px;
}

.page-faq .faq-qa__toggle::after {
  top: 0;
  left: 7px;
  width: 2px;
  height: 16px;
}

.page-faq .faq-qa[open] .faq-qa__toggle::after {
  transform: scaleY(0);
}

.page-faq .faq-qa[open] .faq-qa__toggle::before {
  background: var(--color-accent-lime);
}

.page-faq .faq-qa__a {
  padding: 0 20px 20px;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: rgba(234, 240, 248, 0.8);
  overflow-wrap: break-word;
  animation: faq-fade 0.25s ease-out;
}

.page-faq .faq-qa__a p {
  margin: 0 0 10px;
}

.page-faq .faq-qa__a p:last-child {
  margin-bottom: 0;
}

.page-faq .faq-qa__a a {
  color: var(--color-link);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .faq-keyword {
  color: var(--color-text-main);
  font-weight: 600;
}

@keyframes faq-fade {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== 联系卡 ===== */
.page-faq .faq-contact-card {
  margin-top: 28px;
  padding: 24px;
  background: var(--color-bg-panel);
  border: 1px solid var(--color-border);
  clip-path: polygon(0 0, calc(100% - 28px) 0, 100% 28px, 100% 100%, 28px 100%, 0 calc(100% - 28px));
}

.page-faq .faq-contact-card__title {
  margin: 0 0 14px;
  font-family: var(--font-heading);
  font-size: 1.125rem;
  color: var(--color-text-main);
}

.page-faq .faq-contact-card__list {
  margin: 0 0 16px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-faq .faq-contact-card__list li {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--color-text-sub);
  overflow-wrap: break-word;
}

.page-faq .faq-contact-card__list strong {
  font-family: var(--font-body);
  font-weight: 600;
  color: var(--color-text-main);
}

.page-faq .faq-contact-card__note {
  margin: 0 0 18px;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--color-text-sub);
}

.page-faq .faq-contact-card .btn {
  margin-top: 4px;
}

/* ===== 响应式 ===== */
@media (max-width: 480px) {
  .page-faq .faq-hero__search-kbd {
    display: none;
  }
}

@media (min-width: 700px) {
  .page-faq .faq-qa__a {
    padding: 0 24px 24px 62px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1fr) 320px;
    align-items: end;
  }

  .page-faq .faq-layout {
    grid-template-columns: var(--faq-index-width) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-index__inner {
    position: sticky;
    top: calc(var(--header-top-height) + var(--header-bottom-height) + 24px);
  }

  .page-faq .faq-index__nav {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-index__link {
    width: 100%;
  }

  .page-faq .faq-index__meta {
    display: block;
  }
}

@media (min-width: 1100px) {
  .page-faq .faq-split {
    grid-template-columns: minmax(0, 1fr) 240px;
    align-items: start;
  }

  .page-faq .faq-figure--side .faq-figure__img {
    max-width: 240px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq *,
  .page-faq *::before,
  .page-faq *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}