.page-faq {
  --faq-measure: 720px;
  --faq-rail: 104px;
  --ans-ink: #191d28;
  position: relative;
  isolation: isolate;
  overflow-x: clip;
}

.page-faq::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(42, 51, 80, 0.5) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(42, 51, 80, 0.5) 1px, transparent 1px);
  background-size: 88px 88px;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, rgba(0, 0, 0, 0.32) 46%, transparent 78%);
  mask-image: linear-gradient(180deg, #000 0%, rgba(0, 0, 0, 0.32) 46%, transparent 78%);
  opacity: 0.55;
}

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

/* ---------- 首屏 ---------- */

.faq-hero {
  padding-top: calc(var(--header-h, 108px) + 22px);
  padding-bottom: 12px;
}

.page-faq .breadcrumb {
  margin-bottom: 26px;
}

.faq-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  align-items: center;
}

.faq-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(30px, 4.7vw, 60px);
  line-height: 1.08;
  letter-spacing: -0.015em;
  color: var(--text);
  transform: skewX(-2deg);
  transform-origin: left bottom;
  text-shadow: 0 0 40px rgba(212, 160, 23, 0.22);
}

.faq-hero .lede {
  margin: 20px 0 0;
  max-width: 54ch;
  font-size: 16.5px;
  line-height: 1.8;
  color: var(--text-2);
}

.faq-hero__media {
  margin: 0;
  position: relative;
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow);
  aspect-ratio: 16 / 9;
  overflow: hidden;
}

.faq-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, transparent 52%, rgba(11, 14, 20, 0.7));
}

.faq-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 首屏分类大数字 ---------- */

.faq-rail {
  margin-top: 48px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.faq-rail__item {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px 22px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  color: inherit;
  transition: background-color 160ms var(--ease);
}

.faq-rail__item:hover,
.faq-rail__item:focus-visible {
  background-color: rgba(30, 36, 64, 0.88);
}

.faq-rail__item::after {
  content: "";
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 11px;
  height: 1px;
  background: var(--line);
  transform: scaleX(0.35);
  transform-origin: left center;
  transition: transform 220ms var(--ease), background-color 220ms var(--ease);
}

.faq-rail__item:hover::after,
.faq-rail__item:focus-visible::after {
  transform: scaleX(1);
  background: var(--gold);
}

.faq-rail__num {
  font-family: var(--font-mono);
  font-size: clamp(30px, 4.6vw, 56px);
  line-height: 1;
  color: var(--gold);
  transition: color 160ms var(--ease);
}

.faq-rail__item:hover .faq-rail__num {
  color: var(--gold-hi);
}

.faq-rail__label {
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--text);
}

.faq-rail__meta {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--text-2);
}

/* ---------- 正文骨架 ---------- */

.faq-body {
  position: relative;
  margin-top: 64px;
  padding-top: 52px;
}

.faq-body::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--line) 14%, var(--gold) 50%, var(--line) 86%, transparent);
  opacity: 0.72;
}

.faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
}

.faq-stream {
  display: flex;
  flex-direction: column;
  gap: 52px;
  min-width: 0;
}

/* ---------- 刻度导航 ---------- */

.faq-scale {
  min-width: 0;
}

.faq-scale > .eyebrow {
  margin: 0 0 12px;
}

.faq-scale__list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.faq-scale__list li {
  flex: 0 0 auto;
}

.faq-scale__list a {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  text-decoration: none;
  font-size: 13px;
  color: var(--text-2);
  white-space: nowrap;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.faq-scale__list a:hover,
.faq-scale__list a:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
}

.faq-scale__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--gold);
}

/* ---------- 筛选条 ---------- */

.faq-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-bottom: 2px;
}

/* ---------- 分类分组 ---------- */

.faq-group {
  scroll-margin-top: calc(var(--header-h, 108px) + 28px);
}

.faq-group__head {
  padding-left: 16px;
  border-left: 2px solid var(--gold);
  margin-bottom: 20px;
}

.faq-group__head .eyebrow {
  margin: 0 0 8px;
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(20px, 2.5vw, 28px);
  line-height: 1.3;
  color: var(--text);
}

.faq-group__note {
  margin: 10px 0 0;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--text-2);
}

.faq-group__note a {
  color: var(--cyan);
}

.faq-figure {
  margin: 20px 0 22px;
}

/* ---------- 折叠问答 ---------- */

.faq-item {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--line);
  scroll-margin-top: calc(var(--header-h, 108px) + 32px);
  transition: border-color 160ms var(--ease);
}

.faq-item + .faq-item {
  margin-top: 10px;
}

.faq-item:hover {
  border-color: rgba(212, 160, 23, 0.5);
}

.faq-item[open] {
  border-color: rgba(0, 229, 208, 0.5);
}

.faq-item[open]::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--cyan);
  box-shadow: 0 0 12px rgba(0, 229, 208, 0.55);
}

.faq-item:target {
  border-color: var(--gold);
  box-shadow: 0 0 0 1px rgba(212, 160, 23, 0.35);
}

.faq-q {
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: start;
  gap: 14px;
  padding: 16px 18px;
  font-size: 16px;
  font-weight: 500;
  line-height: 1.6;
  color: var(--text);
}

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

.faq-q::marker {
  content: "";
}

.faq-q:focus-visible {
  outline: 1px solid var(--cyan);
  outline-offset: -2px;
}

.faq-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gold);
  padding-top: 4px;
}

.faq-text {
  min-width: 0;
}

.faq-caret {
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1;
  padding-top: 3px;
  color: var(--text-2);
  transition: transform 160ms var(--ease), color 160ms var(--ease);
}

.faq-item[open] .faq-caret {
  transform: rotate(45deg);
  color: var(--cyan);
}

.faq-a {
  background: var(--paper);
  color: var(--ans-ink);
  border-top: 1px solid var(--line);
  padding: 18px 20px 20px;
}

.faq-a p {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.85;
}

.faq-a a {
  color: #0b6d64;
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 兜底区块 ---------- */

.faq-help {
  margin-top: 84px;
  padding: 76px 0 88px;
  background:
    linear-gradient(118deg, rgba(106, 63, 160, 0.84) 0%, rgba(30, 36, 64, 0.94) 48%, rgba(0, 229, 208, 0.22) 100%);
  clip-path: polygon(0 5%, 100% 0, 100% 100%, 0 100%);
}

.faq-help__inner {
  max-width: var(--faq-measure);
}

.faq-help h2 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(22px, 3vw, 34px);
  line-height: 1.26;
  color: var(--text);
  transform: skewX(-2deg);
  transform-origin: left bottom;
  text-shadow: 0 0 30px rgba(0, 229, 208, 0.22);
}

.faq-help__text {
  margin: 18px 0 0;
  max-width: 58ch;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(232, 234, 240, 0.86);
}

.faq-help__list {
  margin: 24px 0 0;
}

.faq-help__contact {
  margin-top: 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 32px;
}

.faq-help__actions {
  margin: 30px 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .faq-rail__item {
    padding: 22px 20px 26px;
  }

  .faq-rail__item::after {
    left: 20px;
    right: 20px;
  }

  .faq-a {
    padding: 20px 26px 24px 62px;
  }
}

@media (min-width: 720px) {
  .faq-rail {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 940px) {
  .faq-hero {
    padding-top: calc(var(--header-h, 108px) + 34px);
  }

  .faq-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: var(--gap);
  }

  .faq-hero__media {
    aspect-ratio: 16 / 7;
  }

  .faq-rail {
    margin-top: 60px;
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .faq-body {
    margin-top: 76px;
  }

  .faq-stream {
    gap: 60px;
  }
}

@media (min-width: 1020px) {
  .faq-layout {
    grid-template-columns: var(--faq-rail) minmax(0, var(--faq-measure));
    gap: 58px;
    justify-content: center;
  }

  .faq-scale {
    position: sticky;
    top: calc(var(--header-h, 108px) + 22px);
    align-self: start;
  }

  .faq-scale__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
  }

  .faq-scale__list li {
    flex: none;
  }

  .faq-scale__list li + li {
    margin-top: -1px;
  }

  .faq-scale__list a {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    gap: 10px;
    padding: 11px 10px;
    border: 0;
    border-left: 1px solid var(--line);
    font-size: 13px;
  }

  .faq-scale__list a::before {
    content: "";
    position: absolute;
    left: -7px;
    top: 50%;
    width: 6px;
    height: 1px;
    background: var(--line);
    transition: background-color 160ms var(--ease);
  }

  .faq-scale__list a:hover::before,
  .faq-scale__list a:focus-visible::before {
    background: var(--cyan);
  }

  .faq-scale__list a:hover,
  .faq-scale__list a:focus-visible {
    border-color: var(--cyan);
    border-left-color: var(--cyan);
  }
}

@media (min-width: 1200px) {
  .faq-hero h1 {
    max-width: 15ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq * {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}