.page-faq {
  --faq-hair: rgba(29, 46, 77, 0.75);
  --faq-card: rgba(19, 32, 57, 0.68);
  --faq-top: calc(var(--header-h) + 20px);
  display: block;
}

/* ===== 首屏 ===== */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + 40px) 0 8px;
  background:
    radial-gradient(120% 78% at 8% 0%, rgba(41, 240, 224, 0.14), transparent 62%),
    radial-gradient(90% 70% at 92% 12%, rgba(79, 169, 122, 0.12), transparent 70%),
    linear-gradient(180deg, var(--ink-950) 0%, var(--ink-900) 100%);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(29, 46, 77, 0.4) 1px, transparent 1px),
    linear-gradient(90deg, rgba(29, 46, 77, 0.4) 1px, transparent 1px);
  background-size: 76px 76px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.8), transparent 76%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.8), transparent 76%);
  pointer-events: none;
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
}

.page-faq .faq-hero .eyebrow {
  margin: 16px 0 0;
}

.page-faq .faq-hero__title {
  max-width: 20ch;
  margin: 14px 0 20px;
  font-size: clamp(32px, 5.4vw, 66px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-faq .faq-hero__lede {
  max-width: 62ch;
  margin: 0 0 28px;
  color: var(--ice-300);
}

.page-faq .faq-hero__media {
  margin: 0;
  border-color: rgba(41, 240, 224, 0.22);
  box-shadow: 0 30px 70px -40px rgba(41, 240, 224, 0.5);
}

/* ===== 主题筛选 ===== */
.page-faq .faq-topics {
  padding-bottom: 8px;
}

.page-faq .faq-topics__head {
  display: grid;
  gap: 6px;
  margin-bottom: 18px;
}

.page-faq .faq-topics__head .heading-3 {
  margin: 0;
  font-size: clamp(18px, 2.2vw, 22px);
  color: var(--mist-100);
}

.page-faq .faq-topics__hint {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--ink-500);
}

.page-faq .faq-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-faq .filter-chip {
  appearance: none;
  padding: 9px 16px;
  border: 1px solid var(--ink-700);
  border-radius: var(--radius-pill);
  background: rgba(19, 32, 57, 0.7);
  color: var(--ice-300);
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.4;
  cursor: pointer;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-faq .filter-chip:hover {
  color: var(--mist-100);
  border-color: var(--ink-500);
}

.page-faq .filter-chip[aria-pressed="true"],
.page-faq .filter-chip.is-active {
  border-color: var(--cyan);
  background: rgba(41, 240, 224, 0.12);
  color: var(--cyan);
}

.page-faq .faq-empty {
  margin: 16px 0 0;
  padding: 18px 20px;
  border: 1px dashed var(--ink-700);
  border-radius: var(--radius-sm);
  color: var(--ink-500);
  font-size: 14.5px;
}

/* ===== 主体布局：左索引 + 右问答 ===== */
.page-faq .faq-body {
  padding-top: 28px;
}

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
}

.page-faq .faq-rail {
  position: sticky;
  top: var(--header-h);
  z-index: 6;
  margin: 0 calc(var(--gutter) * -1);
  padding: 10px var(--gutter);
  background: rgba(6, 11, 24, 0.94);
  border-bottom: 1px solid var(--faq-hair);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.page-faq .faq-rail__title {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--ink-500);
}

.page-faq .faq-rail__list {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 2px;
  scrollbar-width: none;
}

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

.page-faq .index-rail__link {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
  padding: 8px 13px;
  border: 1px solid var(--ink-700);
  border-radius: var(--radius-pill);
  color: var(--ice-300);
  font-size: 13.5px;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-faq .index-rail__link::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--ink-500);
  transition: background 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.page-faq .index-rail__link:hover {
  color: var(--mist-100);
  border-color: var(--ink-500);
}

.page-faq .index-rail__link[aria-current="true"] {
  color: var(--cyan);
  border-color: rgba(41, 240, 224, 0.55);
  background: rgba(41, 240, 224, 0.09);
}

.page-faq .index-rail__link[aria-current="true"]::before {
  background: var(--cyan);
  box-shadow: 0 0 8px var(--cyan);
}

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

/* ===== 分组 ===== */
.page-faq .faq-group {
  padding: 30px 0 34px;
  border-top: 1px solid var(--faq-hair);
  scroll-margin-top: var(--faq-top);
}

.page-faq .faq-group:first-child {
  border-top: 0;
  padding-top: 6px;
}

.page-faq .faq-group__head {
  display: grid;
  gap: 10px;
  margin-bottom: 4px;
}

.page-faq .faq-group__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-faq .faq-group__title {
  margin: 0;
  font-size: clamp(24px, 3.6vw, 36px);
  line-height: 1.2;
  color: var(--mist-100);
}

.page-faq .faq-group__intro {
  max-width: 58ch;
  margin: 0;
  color: var(--ice-300);
  font-size: 15.5px;
  line-height: 1.8;
}

.page-faq .faq-group__media {
  margin: 22px 0 6px;
  max-width: 560px;
  border-color: var(--faq-hair);
}

.page-faq .faq-group__media .media-frame__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ===== 折叠问答 ===== */
.page-faq .faq-list {
  display: grid;
  gap: 10px;
  margin-top: 22px;
}

.page-faq .faq-item {
  background: linear-gradient(180deg, var(--faq-card), rgba(11, 20, 38, 0.82));
  border: 1px solid var(--faq-hair);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: border-color 0.2s var(--ease);
}

.page-faq .faq-item:hover {
  border-color: rgba(74, 100, 145, 0.9);
}

.page-faq .faq-item__q {
  margin: 0;
  font-size: inherit;
  font-weight: inherit;
}

.page-faq .fold__toggle {
  width: 100%;
  display: flex;
  align-items: flex-start;
  gap: 13px;
  padding: 17px 18px;
  border: 0;
  background: none;
  text-align: left;
  cursor: pointer;
  color: var(--mist-100);
  font-family: var(--font-body);
  font-size: 15.5px;
  font-weight: 500;
  line-height: 1.65;
  transition: color 0.2s var(--ease);
}

.page-faq .fold__toggle:hover {
  color: var(--white);
}

.page-faq .faq-item__idx {
  flex: 0 0 auto;
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ink-500);
}

.page-faq .faq-item__text {
  flex: 1 1 auto;
  min-width: 0;
}

.page-faq .faq-item__icon {
  position: relative;
  flex: 0 0 auto;
  width: 15px;
  height: 15px;
  margin-top: 4px;
}

.page-faq .faq-item__icon::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 6.5px;
  height: 2px;
  border-radius: 2px;
  background: var(--cyan);
}

.page-faq .faq-item__icon::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 6.5px;
  width: 2px;
  border-radius: 2px;
  background: var(--cyan);
  transition: transform 0.25s var(--ease), opacity 0.25s var(--ease);
}

.page-faq .fold__toggle[aria-expanded="true"] .faq-item__icon::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-faq .faq-item__panel {
  padding: 0 18px 18px 18px;
  color: var(--ice-300);
  font-size: 15px;
  line-height: 1.85;
}

.page-faq .faq-item__panel p {
  margin: 0;
}

.page-faq .faq-item__panel a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(41, 240, 224, 0.4);
}

.page-faq .faq-item__panel a:hover {
  border-bottom-color: var(--cyan);
}

/* ===== 收束区 ===== */
.page-faq .faq-cta {
  margin-top: 34px;
  padding: clamp(24px, 4vw, 46px);
  border: 1px solid rgba(41, 240, 224, 0.26);
  border-radius: var(--radius);
  background:
    radial-gradient(90% 120% at 0% 0%, rgba(41, 240, 224, 0.14), transparent 62%),
    linear-gradient(135deg, var(--ink-800), var(--ink-900) 72%);
  scroll-margin-top: var(--faq-top);
}

.page-faq .faq-cta .eyebrow {
  margin: 0 0 12px;
}

.page-faq .faq-cta__title {
  margin: 0 0 14px;
  font-size: clamp(23px, 3.2vw, 32px);
  line-height: 1.25;
  color: var(--white);
}

.page-faq .faq-cta__text {
  max-width: 58ch;
  margin: 0 0 22px;
  color: var(--ice-300);
  font-size: 15.5px;
  line-height: 1.8;
}

.page-faq .faq-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-faq .faq-cta__meta {
  display: grid;
  gap: 14px;
  margin: 28px 0 0;
  padding-top: 22px;
  border-top: 1px solid rgba(41, 240, 224, 0.18);
}

.page-faq .faq-cta__meta-item {
  display: grid;
  gap: 4px;
}

.page-faq .faq-cta__meta-item dt {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--ink-500);
}

.page-faq .faq-cta__meta-item dd {
  margin: 0;
  color: var(--mist-100);
  font-size: 15px;
  word-break: break-word;
}

.page-faq .copy-mail[data-copied] {
  border-color: var(--cyan);
  color: var(--cyan);
}

/* ===== 中屏以上 ===== */
@media (min-width: 720px) {
  .page-faq .faq-cta__meta {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-faq .faq-item__panel {
    padding: 0 22px 20px 58px;
  }

  .page-faq .fold__toggle {
    padding: 18px 22px;
    font-size: 16px;
  }
}

/* ===== 桌面：左侧吸附索引 ===== */
@media (min-width: 960px) {
  .page-faq .faq-hero {
    padding-top: calc(var(--header-h) + 56px);
  }

  .page-faq .faq-layout {
    grid-template-columns: 236px minmax(0, 1fr);
    gap: 52px;
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: var(--faq-top);
    z-index: 2;
    margin: 0;
    padding: 0;
    background: none;
    border-bottom: 0;
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
  }

  .page-faq .faq-rail__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
  }

  .page-faq .index-rail__link {
    flex: 0 1 auto;
    white-space: normal;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    padding: 10px 12px;
    font-size: 14px;
  }

  .page-faq .index-rail__link[aria-current="true"] {
    background: rgba(41, 240, 224, 0.08);
    border-left-color: var(--cyan);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  }

  .page-faq .faq-group {
    padding: 38px 0 42px;
  }

  .page-faq .faq-cta {
    margin-top: 42px;
  }
}
</PAGE_CSS>>>