/* ===== 答疑中心 page-faq ===== */

.page-faq {
  --faq-rail-w: 224px;
  --faq-gap: clamp(24px, 3.5vw, 48px);
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  color: var(--c-on-dark);
  background-color: var(--c-night);
  background-image:
    repeating-linear-gradient(90deg, rgba(201, 209, 220, .06) 0 1px, transparent 1px 92px),
    linear-gradient(158deg, var(--c-night) 0%, #0a1f3a 58%, var(--c-navy) 100%);
  border-bottom: 1px solid var(--c-line-dark);
  padding-block: clamp(34px, 5vw, 62px) clamp(38px, 5.5vw, 68px);
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  min-width: 0;
}

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

.page-faq .faq-hero__eyebrow {
  color: var(--c-amber);
}

.page-faq .faq-hero h1 {
  margin: 10px 0 0;
  font-family: var(--font-head);
  font-size: clamp(1.85rem, 5.4vw, 3.1rem);
  font-weight: 700;
  line-height: 1.16;
  letter-spacing: -.012em;
  color: #fff;
  max-width: 20em;
}

.page-faq .faq-hero__lede {
  margin: clamp(14px, 2vw, 20px) 0 0;
  max-width: 52ch;
  font-size: clamp(1rem, 1.5vw, 1.0625rem);
  line-height: 1.82;
  color: var(--c-on-dark-soft);
}

.page-faq .faq-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(18px, 3vw, 40px);
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding-top: clamp(16px, 2.4vw, 24px);
  border-top: 1px solid var(--c-line-dark);
}

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

.page-faq .faq-fact dt {
  font-size: var(--fs-12);
  letter-spacing: .06em;
  color: var(--c-on-dark-soft);
}

.page-faq .faq-fact dd {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(1.2rem, 2.4vw, 1.55rem);
  font-weight: 600;
  color: var(--c-amber);
  letter-spacing: -.01em;
}

.page-faq .faq-hero__visual {
  display: grid;
  gap: 16px;
  padding: clamp(18px, 2.6vw, 26px);
  border: 1px solid var(--c-line-dark);
  background: rgba(6, 21, 39, .55);
  min-width: 0;
}

.page-faq .faq-scale__ticks {
  display: block;
  height: 30px;
  background-image: repeating-linear-gradient(
    to right,
    rgba(201, 209, 220, .5) 0 1px,
    transparent 1px 14px
  );
  -webkit-mask-image: linear-gradient(to right, #000 0%, rgba(0, 0, 0, .25) 70%, transparent 100%);
  mask-image: linear-gradient(to right, #000 0%, rgba(0, 0, 0, .25) 70%, transparent 100%);
}

.page-faq .faq-scale__caption {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .1em;
  color: var(--c-on-dark-soft);
}

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

.page-faq .faq-scale__chips li {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: var(--fs-14);
  color: var(--c-on-dark-soft);
}

/* ---------- 主体布局 ---------- */

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

.page-faq .faq-layout {
  display: grid;
  gap: var(--faq-gap);
  min-width: 0;
}

/* ---------- 左侧分组索引 ---------- */

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

.page-faq .faq-rail__title {
  margin: 0 0 10px;
  padding-top: 10px;
  border-top: 2px solid var(--c-navy);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .12em;
  color: var(--c-text-mute);
}

.page-faq .faq-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-faq .faq-rail__link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--c-line);
  color: var(--c-text);
  text-decoration: none;
  font-size: var(--fs-14);
  line-height: 1.4;
  transition: border-color var(--t-fast) var(--ease), background-color var(--t-fast) var(--ease);
}

.page-faq .faq-rail__code {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  color: var(--c-text-mute);
}

.page-faq .faq-rail__count {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  color: var(--c-green-ink);
}

.page-faq .faq-rail__link:hover {
  border-color: var(--c-amber);
  background: rgba(242, 169, 59, .08);
}

.page-faq .faq-rail__link:focus-visible {
  outline: 2px solid var(--c-neon);
  outline-offset: 2px;
}

/* ---------- 分组 ---------- */

.page-faq .faq-groups {
  display: grid;
  gap: clamp(40px, 5vw, 72px);
  min-width: 0;
}

.page-faq .faq-group {
  min-width: 0;
  scroll-margin-top: calc(var(--header-h) + 16px);
}

.page-faq .faq-group__head {
  display: flex;
  gap: clamp(12px, 2vw, 18px);
  align-items: flex-start;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--c-line-strong);
  transition: border-color var(--t-base) var(--ease);
}

.page-faq .faq-group:target .faq-group__head {
  border-bottom-color: var(--c-green);
}

.page-faq .faq-group__badge {
  flex: none;
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  background: var(--c-navy);
  color: var(--c-amber);
  font-family: var(--font-mono);
  font-size: var(--fs-16);
  font-weight: 700;
}

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

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(1.25rem, 2.6vw, 1.7rem);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -.012em;
  color: var(--c-ink);
}

.page-faq .faq-group__desc {
  margin: 8px 0 0;
  max-width: 62ch;
  font-size: var(--fs-16);
  line-height: 1.75;
  color: var(--c-text-soft);
}

/* ---------- 配图 ---------- */

.page-faq .faq-figure {
  margin: clamp(20px, 3vw, 28px) 0 0;
  border: 1px solid var(--c-line);
  background: var(--c-mist);
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

.page-faq .faq-figure--wide img {
  aspect-ratio: 2 / 1;
}

.page-faq .faq-figure figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--c-line);
  font-size: var(--fs-12);
  line-height: 1.6;
  color: var(--c-text-mute);
  background: var(--c-surface);
}

/* ---------- 折叠问答 ---------- */

.page-faq .faq-list {
  margin-top: clamp(16px, 2.4vw, 24px);
  border-top: 1px solid var(--c-line);
}

.page-faq .faq-item {
  border-bottom: 1px solid var(--c-line);
  border-left: 2px solid transparent;
  background: var(--c-surface);
  transition: border-color var(--t-base) var(--ease), background-color var(--t-base) var(--ease);
}

.page-faq .faq-item:hover {
  border-left-color: var(--c-green);
}

.page-faq .faq-item[open] {
  border-left-color: var(--c-amber);
  background: var(--c-paper);
}

.page-faq .faq-item__q {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 12px;
  align-items: baseline;
  padding: clamp(14px, 2vw, 18px) clamp(14px, 2vw, 20px);
  cursor: pointer;
  list-style: none;
  font-family: var(--font-head);
  font-size: clamp(1rem, 1.6vw, 1.0625rem);
  font-weight: 600;
  line-height: 1.5;
  color: var(--c-ink);
}

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

.page-faq .faq-item__q::marker {
  content: "";
}

.page-faq .faq-item__q:focus-visible {
  outline: 2px solid var(--c-neon);
  outline-offset: -2px;
}

.page-faq .faq-item__idx {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  font-weight: 400;
  letter-spacing: .04em;
  color: var(--c-text-mute);
}

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

.page-faq .faq-item__arrow {
  position: relative;
  width: 14px;
  height: 14px;
  align-self: center;
  flex: none;
}

.page-faq .faq-item__arrow::before,
.page-faq .faq-item__arrow::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 13px;
  height: 1.5px;
  background: var(--c-text-mute);
  transition: transform var(--t-base) var(--ease), opacity var(--t-base) var(--ease), background-color var(--t-base) var(--ease);
}

.page-faq .faq-item__arrow::before {
  transform: translate(-50%, -50%) rotate(0deg);
}

.page-faq .faq-item__arrow::after {
  transform: translate(-50%, -50%) rotate(90deg);
}

.page-faq .faq-item[open] .faq-item__arrow::before {
  background: var(--c-amber-ink);
}

.page-faq .faq-item[open] .faq-item__arrow::after {
  opacity: 0;
  transform: translate(-50%, -50%) rotate(0deg);
}

.page-faq .faq-item__a {
  padding: 0 clamp(14px, 2vw, 20px) clamp(16px, 2.4vw, 22px);
}

.page-faq .faq-item__a p {
  margin: 0;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--c-text-soft);
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    align-items: center;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
  }

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

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

  .page-faq .faq-rail__link {
    justify-content: flex-start;
    border: 0;
    border-left: 2px solid var(--c-line);
    padding: 9px 10px;
    font-size: var(--fs-14);
  }

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

  .page-faq .faq-rail__count {
    margin-left: auto;
  }
}

@media (max-width: 619px) {
  .page-faq .faq-item__q {
    grid-template-columns: auto minmax(0, 1fr) auto;
    gap: 10px;
  }

  .page-faq .faq-item__a {
    padding-left: clamp(14px, 2vw, 20px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item,
  .page-faq .faq-item__arrow::before,
  .page-faq .faq-item__arrow::after,
  .page-faq .faq-rail__link,
  .page-faq .faq-group__head {
    transition: none;
  }
}