.page-faq {
  --faq-rail-w: 250px;
  --faq-gap: clamp(24px, 4vw, 52px);
  --faq-neon-soft: rgba(228, 255, 63, 0.12);
  display: block;
}

/* ============ 首屏 ============ */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 130% at 100% 0%, rgba(90, 15, 30, 0.62) 0%, rgba(16, 17, 20, 0) 62%),
    linear-gradient(180deg, #101114 0%, #0b0c0f 100%);
  padding-block: clamp(26px, 4vw, 52px) clamp(30px, 5vw, 66px);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(138, 144, 153, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(138, 144, 153, 0.07) 1px, transparent 1px);
  background-size: 56px 56px;
  pointer-events: none;
}

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

.page-faq .faq-hero__inner {
  display: grid;
  gap: clamp(22px, 4vw, 44px);
  align-items: center;
}

.page-faq .faq-hero__kicker {
  margin: 18px 0 10px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--neon);
}

.page-faq .faq-hero__lede {
  margin: 16px 0 0;
  max-width: 46ch;
  font-size: clamp(0.96rem, 1.5vw, 1.06rem);
  line-height: 1.85;
  color: rgba(242, 243, 245, 0.76);
}

.page-faq h1 {
  margin: 0;
  font-size: clamp(1.75rem, 6vw, 3.1rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.16;
  color: var(--fog);
}

.page-faq .faq-hero__media {
  margin: 0;
}

.page-faq .faq-hero__media .media {
  aspect-ratio: 1 / 1;
  max-width: 340px;
  margin-inline: auto;
  border: 1px solid var(--line);
  clip-path: polygon(0 var(--cut), var(--cut) 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
}

/* ============ 主体两栏 ============ */
.page-faq .faq-body {
  display: grid;
  gap: var(--faq-gap);
  padding-block: clamp(30px, 5vw, 68px) clamp(44px, 7vw, 88px);
}

/* 左侧分类索引 —— 刻度式竖排列表 */
.page-faq .faq-rail {
  position: relative;
  border-top: 1px solid var(--line);
  padding-top: 16px;
}

.page-faq .faq-rail__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--steel);
}

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

.page-faq .faq-rail__item {
  flex: 0 0 auto;
}

.page-faq .faq-chip {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 9px 12px;
  border: 0;
  border-left: 2px solid var(--line);
  background: none;
  color: var(--steel);
  font: inherit;
  font-size: 0.9rem;
  line-height: 1.4;
  text-align: left;
  white-space: nowrap;
  cursor: pointer;
  transition: color 0.22s var(--ease), border-color 0.22s var(--ease), background 0.22s var(--ease);
}

.page-faq .faq-chip:hover {
  color: var(--fog);
  border-left-color: var(--line-strong);
  background: rgba(74, 155, 255, 0.07);
}

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

.page-faq .faq-chip[aria-pressed="true"] {
  color: var(--fog);
  border-left-color: var(--neon);
  background: linear-gradient(90deg, var(--faq-neon-soft), rgba(228, 255, 63, 0));
}

.page-faq .faq-chip__no {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--steel);
  transition: color 0.22s var(--ease);
}

.page-faq .faq-chip[aria-pressed="true"] .faq-chip__no {
  color: var(--neon);
}

.page-faq .faq-rail__note {
  margin: 14px 0 0;
  font-size: 0.82rem;
  line-height: 1.75;
  color: var(--steel);
}

.page-faq .faq-rail__note a {
  color: var(--blau);
  text-decoration: none;
  border-bottom: 1px solid rgba(74, 155, 255, 0.42);
}

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

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

.page-faq .faq-group {
  border-top: 1px solid var(--line);
  padding-top: clamp(20px, 3vw, 32px);
  margin-bottom: clamp(30px, 5vw, 56px);
}

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

.page-faq .faq-group[hidden] {
  display: none;
}

.page-faq .faq-group__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 18px;
}

.page-faq .faq-group__no {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--neon);
}

.page-faq .faq-group__title {
  margin: 0;
  font-size: clamp(1.22rem, 3.4vw, 1.85rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.28;
  color: var(--fog);
}

.page-faq .faq-figure {
  margin: 0 0 22px;
  max-width: 720px;
}

.page-faq .faq-figure .media {
  border: 1px solid var(--line);
  clip-path: polygon(0 var(--cut), var(--cut) 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
}

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

.page-faq .faq-qas {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .qa {
  border-bottom: 1px solid var(--line);
  transition: background 0.22s var(--ease);
}

.page-faq .qa:first-child {
  border-top: 1px solid var(--line);
}

.page-faq .qa__q {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0;
  padding: 17px 6px 17px 0;
  color: var(--fog);
  font-size: clamp(0.98rem, 1.6vw, 1.08rem);
  font-weight: 700;
  line-height: 1.55;
  letter-spacing: 0.005em;
  cursor: pointer;
  list-style: none;
  transition: color 0.22s var(--ease);
}

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

.page-faq .qa__q::after {
  content: "＋";
  margin-left: auto;
  padding-left: 12px;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  color: var(--steel);
  transition: color 0.22s var(--ease);
}

.page-faq .qa[open] > .qa__q {
  color: var(--neon);
}

.page-faq .qa[open] > .qa__q::after {
  content: "－";
  color: var(--neon);
}

.page-faq .qa__q:hover {
  color: var(--blau);
}

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

.page-faq .qa__mark {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--steel);
  padding-top: 0.28em;
  transition: color 0.22s var(--ease);
}

.page-faq .qa[open] .qa__mark {
  color: var(--ziegel);
}

.page-faq .qa__a {
  position: relative;
  max-width: 66ch;
  padding: 0 0 20px 30px;
}

.page-faq .qa__a::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 4px;
  width: 6px;
  height: calc(100% - 26px);
  min-height: 24px;
  background: linear-gradient(180deg, var(--neon), rgba(228, 255, 63, 0.06));
  clip-path: polygon(0 0, 100% 0, 62% 100%, 0 100%);
}

.page-faq .qa__a p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.85;
  color: rgba(242, 243, 245, 0.76);
}

.page-faq .qa__a .num {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--neon);
  letter-spacing: 0.01em;
}

.page-faq .qa__a a {
  color: var(--blau);
  text-decoration: none;
  border-bottom: 1px solid rgba(74, 155, 255, 0.42);
  word-break: break-all;
}

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

/* ============ 收尾区块 ============ */
.page-faq .faq-outro {
  margin-top: clamp(8px, 2vw, 18px);
  padding: clamp(22px, 3.4vw, 38px);
  background:
    linear-gradient(135deg, rgba(37, 26, 77, 0.75) 0%, rgba(6, 48, 46, 0.6) 100%);
  border: 1px solid var(--line);
  clip-path: polygon(0 var(--cut-lg), var(--cut-lg) 0, 100% 0, 100% calc(100% - var(--cut-lg)), calc(100% - var(--cut-lg)) 100%, 0 100%);
}

.page-faq .faq-outro__title {
  margin: 0;
  font-size: clamp(1.1rem, 2.6vw, 1.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--fog);
}

.page-faq .faq-outro__text {
  margin: 10px 0 0;
  max-width: 52ch;
  font-size: 0.92rem;
  line-height: 1.8;
  color: rgba(242, 243, 245, 0.72);
}

.page-faq .faq-outro__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.page-faq .faq-footnote {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin: clamp(24px, 3vw, 36px) 0 0;
  font-size: 0.84rem;
  line-height: 1.8;
  color: var(--steel);
}

.page-faq .faq-footnote__dot {
  flex: 0 0 auto;
  width: 7px;
  height: 7px;
  margin-top: 0.6em;
  background: var(--neon);
  clip-path: polygon(50% 0, 100% 50%, 50% 100%, 0 50%);
}

.page-faq .faq-top-wrap {
  display: flex;
  justify-content: flex-end;
  margin-top: 18px;
}

.page-faq .faq-top {
  cursor: pointer;
}

/* ============ 响应式 ============ */
@media (min-width: 900px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 340px);
  }

  .page-faq .faq-body {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--hdr-slim) + 20px);
    border-top: 0;
    border-left: 1px solid var(--line);
    padding-top: 4px;
    padding-left: 18px;
  }

  .page-faq .faq-rail__list {
    flex-direction: column;
    gap: 2px;
    overflow-x: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-rail__item {
    flex: 1 1 auto;
  }

  .page-faq .faq-chip {
    padding: 10px 10px 10px 0;
    white-space: normal;
  }
}

@media (max-width: 899px) {
  .page-faq .faq-hero__media {
    order: -1;
  }

  .page-faq .faq-hero__media .media {
    max-width: 240px;
    margin-inline: 0;
  }

  .page-faq .qa__a {
    padding-left: 22px;
  }
}

@media (max-width: 560px) {
  .page-faq .qa__q {
    gap: 9px;
    font-size: 0.96rem;
  }

  .page-faq .qa__a p {
    font-size: 0.9rem;
  }

  .page-faq .faq-outro__actions .btn {
    width: 100%;
    text-align: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa,
  .page-faq .qa__q,
  .page-faq .qa__q::after,
  .page-faq .qa__mark,
  .page-faq .faq-chip,
  .page-faq .faq-chip__no {
    transition: none;
  }
}