.page-faq {
  --faq-rail: 216px;
  --faq-gap: clamp(20px, 3vw, 40px);
  display: block;
  background: var(--deep-space);
  color: var(--frost);
}

/* ============ 首屏框景 ============ */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line-steel);
  background:
    repeating-linear-gradient(90deg, transparent 0 31px, rgba(47, 230, 214, .16) 31px 32px) bottom / 100% 34px no-repeat,
    linear-gradient(180deg, var(--navy-deck) 0%, var(--deep-space) 100%);
}

.page-faq .faq-hero::before,
.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  z-index: 2;
  width: 26px;
  height: 26px;
  pointer-events: none;
}

.page-faq .faq-hero::before {
  top: 14px;
  left: 14px;
  border-top: 2px solid var(--cyan);
  border-left: 2px solid var(--cyan);
}

.page-faq .faq-hero::after {
  right: 14px;
  bottom: 14px;
  border-right: 2px solid var(--signal);
  border-bottom: 2px solid var(--signal);
}

.page-faq .faq-hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-faq .faq-hero__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .26;
  max-width: 100%;
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
  padding-block: clamp(30px, 5vw, 62px) clamp(34px, 5vw, 58px);
}

.page-faq .faq-hero__lede {
  max-width: 62ch;
  margin: 16px 0 0;
  font-size: 17px;
  line-height: 1.78;
  color: var(--mist);
}

.page-faq .faq-search {
  max-width: 560px;
  margin-top: clamp(22px, 3vw, 34px);
}

.page-faq .faq-search__label {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-faq .faq-search__input {
  width: 100%;
  padding: 14px 16px;
  border: 1px solid var(--line-steel);
  border-radius: 2px;
  background: rgba(12, 23, 48, .92);
  color: var(--frost);
  font-family: var(--font-body);
  font-size: 16px;
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-faq .faq-search__input::placeholder {
  color: rgba(143, 160, 196, .8);
}

.page-faq .faq-search__input:focus {
  outline: none;
  border-color: var(--cyan);
  box-shadow: 0 0 0 3px rgba(47, 230, 214, .16);
}

.page-faq .faq-search__hint {
  margin: 8px 0 0;
  font-size: 13px;
  color: var(--mist);
}

/* ============ 分屏外壳 ============ */
.page-faq .faq-shell {
  display: grid;
  gap: var(--faq-gap);
  padding-block: clamp(26px, 4vw, 52px) clamp(50px, 7vw, 104px);
}

.page-faq .faq-rail {
  align-self: start;
  display: grid;
  gap: 12px;
}

.page-faq .faq-rail .index-rail__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-faq .faq-rail .rail-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-faq .faq-rail .rail-nav__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 13px;
  border: 1px solid var(--line-steel);
  border-radius: 999px;
  color: var(--mist);
  font-size: 14px;
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-faq .faq-rail .rail-nav__link:hover {
  color: var(--frost);
  border-color: var(--cyan);
}

.page-faq .faq-rail .rail-nav__link.is-active {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--deep-space);
}

.page-faq .faq-rail .rail-nav__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  opacity: .85;
}

/* ============ 分组与问答 ============ */
.page-faq .faq-group {
  margin-bottom: clamp(40px, 6vw, 76px);
}

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

.page-faq .faq-group__head {
  padding-top: 16px;
  margin-bottom: 16px;
  border-top: 2px solid var(--line-steel);
}

.page-faq .faq-group__num {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .18em;
  color: var(--ember);
}

.page-faq .faq-list {
  border-top: 1px solid var(--line-steel);
}

.page-faq .faq-item {
  border-bottom: 1px solid var(--line-steel);
  transition: background var(--dur) var(--ease);
}

.page-faq .faq-item[open] {
  background: linear-gradient(90deg, rgba(47, 230, 214, .07), rgba(47, 230, 214, 0) 72%);
}

.page-faq .faq-item__summary {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 17px 6px;
  cursor: pointer;
  list-style: none;
  transition: color var(--dur) var(--ease);
}

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

.page-faq .faq-item__summary:hover .faq-item__q {
  color: var(--cyan);
}

.page-faq .faq-item__summary::after {
  content: "";
  flex: 0 0 auto;
  width: 9px;
  height: 9px;
  margin-top: 8px;
  border-right: 1.5px solid var(--cyan);
  border-bottom: 1.5px solid var(--cyan);
  transform: rotate(45deg);
  transition: transform var(--dur) var(--ease);
}

.page-faq .faq-item[open] .faq-item__summary::after {
  transform: rotate(-135deg);
  margin-top: 12px;
}

.page-faq .faq-item__num {
  flex: 0 0 auto;
  padding: 2px 0 2px 9px;
  border-left: 2px solid var(--line-steel);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--mist);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-faq .faq-item[open] .faq-item__num {
  color: var(--cyan);
  border-left-color: var(--cyan);
}

.page-faq .faq-item__q {
  flex: 1 1 auto;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.55;
  color: var(--frost);
  transition: color var(--dur) var(--ease);
}

.page-faq .faq-item__body {
  padding: 0 6px 20px 40px;
  max-width: 74ch;
}

.page-faq .faq-item__body p {
  margin: 0 0 10px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--frost);
}

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

.page-faq .faq-item__note {
  font-size: 15px;
  color: var(--mist);
}

.page-faq .faq-figure {
  margin: clamp(20px, 3vw, 30px) 0 0;
  border: 1px solid var(--line-steel);
  background: var(--navy-deck);
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-faq .faq-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

/* ============ 奶油纸收束区块 ============ */
.page-faq .faq-help {
  margin-bottom: 0;
  padding: clamp(24px, 4vw, 46px);
  background: var(--cream);
  color: var(--cream-ink);
  border: 1px solid var(--cream);
  box-shadow: 0 20px 44px rgba(5, 10, 24, .52);
}

.page-faq .faq-help .faq-group__head {
  border-top-color: rgba(16, 19, 31, .35);
}

.page-faq .faq-help .section-head__title,
.page-faq .faq-help .faq-group__title {
  color: var(--cream-ink);
}

.page-faq .faq-help .section-head__meta,
.page-faq .faq-help .faq-group__meta {
  color: rgba(16, 19, 31, .68);
}

.page-faq .faq-help .faq-group__num {
  color: var(--ember);
}

.page-faq .faq-help .faq-list {
  border-top-color: rgba(16, 19, 31, .25);
}

.page-faq .faq-help .faq-item {
  border-bottom-color: rgba(16, 19, 31, .25);
}

.page-faq .faq-help .faq-item[open] {
  background: rgba(16, 19, 31, .05);
}

.page-faq .faq-help .faq-item__q {
  color: var(--cream-ink);
}

.page-faq .faq-help .faq-item__summary:hover .faq-item__q {
  color: var(--teal-shadow);
}

.page-faq .faq-help .faq-item__num {
  color: rgba(16, 19, 31, .55);
  border-left-color: rgba(16, 19, 31, .3);
}

.page-faq .faq-help .faq-item[open] .faq-item__num {
  color: var(--teal-shadow);
  border-left-color: var(--teal-shadow);
}

.page-faq .faq-help .faq-item__summary::after {
  border-right-color: var(--ember);
  border-bottom-color: var(--ember);
}

.page-faq .faq-help .faq-item__body p {
  color: rgba(16, 19, 31, .85);
}

.page-faq .faq-help .faq-item__note {
  color: rgba(16, 19, 31, .62);
}

.page-faq .faq-help .btn--ghost {
  color: var(--cream-ink);
  border-color: rgba(16, 19, 31, .45);
}

.page-faq .faq-help .btn--ghost:hover {
  color: var(--teal-shadow);
  border-color: var(--teal-shadow);
}

/* ============ 响应式 ============ */
@media (min-width: 720px) {
  .page-faq .faq-item__body {
    padding-left: 46px;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-shell {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
    gap: clamp(30px, 4vw, 68px);
  }

  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

  .page-faq .faq-rail .rail-nav {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 2px;
  }

  .page-faq .faq-rail .rail-nav__link {
    padding: 9px 10px;
    border: none;
    border-left: 2px solid var(--line-steel);
    border-radius: 0;
    font-size: 14px;
    line-height: 1.4;
  }

  .page-faq .faq-rail .rail-nav__link.is-active {
    background: transparent;
    color: var(--cyan);
    border-left-color: var(--cyan);
  }

  .page-faq .faq-rail .rail-nav__link:hover {
    color: var(--frost);
  }
}

@media (min-width: 1200px) {
  .page-faq .faq-item__q {
    font-size: 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item,
  .page-faq .faq-item__summary,
  .page-faq .faq-item__summary::after,
  .page-faq .faq-item__q,
  .page-faq .faq-item__num,
  .page-faq .faq-rail .rail-nav__link,
  .page-faq .faq-search__input {
    transition: none;
  }
}