.page-faq {
  background: var(--ink-950);
  color: var(--paper);
  overflow-x: hidden;
}

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

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

.page-faq .breadcrumb {
  padding-top: clamp(14px, 2.4vw, 22px);
  font-size: 13px;
}

/* ---------- 首屏拼贴 ---------- */

.page-faq .faq-hero {
  position: relative;
  padding: clamp(22px, 4vw, 40px) 0 clamp(24px, 4vw, 44px);
  border-bottom: 1px solid var(--line-soft);
  background-image:
    linear-gradient(180deg, var(--ink-900) 0%, rgba(10, 31, 24, 0) 72%),
    repeating-linear-gradient(90deg, var(--grid-line) 0 1px, transparent 1px 88px);
  background-repeat: no-repeat, repeat;
}

.page-faq .faq-hero__text {
  max-width: 78ch;
}

.page-faq .faq-hero .h-page {
  margin: 10px 0 16px;
  font-size: clamp(30px, 5.6vw, 52px);
  line-height: 1.14;
  letter-spacing: -0.01em;
}

.page-faq .faq-hero .lede {
  max-width: 68ch;
  color: rgba(242, 247, 243, 0.86);
}

.page-faq .faq-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-chips li {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.03em;
  color: var(--cyan-soft);
  border: 1px solid var(--line);
  background: rgba(15, 43, 34, 0.6);
  padding: 6px 10px;
  white-space: nowrap;
}

.page-faq .faq-hero__media {
  margin: clamp(22px, 4vw, 38px) 0 0;
}

/* ---------- 双栏骨架 ---------- */

.page-faq .faq-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 32px);
  padding-top: clamp(26px, 4.4vw, 48px);
  padding-bottom: clamp(46px, 8vw, 88px);
}

.page-faq .rail__sticky {
  position: static;
}

.page-faq .toc {
  display: flex;
  flex-direction: row;
  gap: 4px;
  margin: 10px 0 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-faq .toc__link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  font-size: 14px;
  color: var(--mist);
  text-decoration: none;
  border-left: 2px solid transparent;
  white-space: nowrap;
  transition: color var(--speed) ease, border-color var(--speed) ease, background var(--speed) ease;
}

.page-faq .toc__link:hover {
  color: var(--paper);
}

.page-faq .toc__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--line);
}

.page-faq .toc__link[aria-current="true"] {
  color: var(--cyan);
  border-left-color: var(--cyan);
  background: var(--cyan-dim);
}

.page-faq .toc__link[aria-current="true"] .toc__num {
  color: var(--cyan-soft);
}

.page-faq .faq-rail__note {
  margin-top: 16px;
  padding: 14px 16px 16px;
  border: 1px solid var(--line);
  background: var(--ink-900);
}

.page-faq .faq-rail__note-k {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--orange-soft);
}

.page-faq .faq-rail__note-t {
  margin: 8px 0 12px;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(242, 247, 243, 0.78);
}

/* ---------- 章节 ---------- */

.page-faq .faq-sec + .faq-sec {
  border-top: 1px solid var(--line-soft);
}

.page-faq .faq-sec {
  padding-top: clamp(22px, 3.6vw, 40px);
}

.page-faq .faq-sec .sec-head {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  margin-bottom: 16px;
}

.page-faq .faq-sec .sec-index {
  font-size: clamp(38px, 6vw, 64px);
  line-height: 0.9;
  color: var(--ink-800);
  -webkit-text-stroke: 1px var(--line);
}

.page-faq .faq-sec .h-2 {
  margin: 0;
  font-size: clamp(20px, 2.6vw, 28px);
}

.page-faq .faq-sec__lead {
  margin: 6px 0 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.7;
  color: var(--mist);
}

.page-faq .faq-sec__split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 3vw, 28px);
}

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

/* ---------- 问题条目 ---------- */

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

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

.page-faq .qa[open] {
  background: rgba(69, 240, 214, 0.05);
}

.page-faq .qa__q {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px 14px;
  cursor: pointer;
  list-style: none;
  transition: box-shadow var(--speed) ease;
}

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

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

.page-faq .qa[open] .qa__q {
  box-shadow: inset 2px 0 0 var(--cyan);
}

.page-faq .qa__n {
  flex: 0 0 auto;
  min-width: 26px;
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--line);
}

.page-faq .qa__t {
  flex: 1 1 auto;
  font-size: clamp(16px, 1.6vw, 18px);
  font-weight: 600;
  line-height: 1.55;
  color: var(--paper);
}

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

.page-faq .qa[open] .qa__t {
  color: var(--cyan-soft);
}

.page-faq .qa__sign {
  position: relative;
  flex: 0 0 auto;
  width: 16px;
  height: 16px;
  margin-top: 5px;
}

.page-faq .qa__sign::before,
.page-faq .qa__sign::after {
  content: "";
  position: absolute;
  background: var(--cyan);
}

.page-faq .qa__sign::before {
  left: 0;
  right: 0;
  top: 7.5px;
  height: 1px;
}

.page-faq .qa__sign::after {
  top: 0;
  bottom: 0;
  left: 7.5px;
  width: 1px;
  transition: transform var(--speed) ease;
}

.page-faq .qa[open] .qa__sign::after {
  transform: scaleY(0);
}

.page-faq .qa__a {
  padding: 0 16px 20px 52px;
}

.page-faq .qa__a p {
  margin: 0 0 10px;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(242, 247, 243, 0.82);
}

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

.page-faq .qa__a a {
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 面板与联系 ---------- */

.page-faq .faq-panel {
  margin-top: clamp(20px, 3vw, 30px);
  padding: 18px;
  border: 1px solid var(--line);
  background: var(--ink-900);
}

.page-faq .faq-panel--orange {
  border-color: rgba(255, 122, 47, 0.45);
  background-image: linear-gradient(135deg, var(--orange-dim), rgba(255, 122, 47, 0) 62%);
  background-repeat: no-repeat;
}

.page-faq .faq-panel__k {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--orange-soft);
}

.page-faq .faq-panel > p:not(.faq-panel__k) {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(242, 247, 243, 0.8);
}

.page-faq .faq-contact {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin-top: 12px;
}

.page-faq .faq-contact__item {
  padding: 12px 14px;
  border: 1px solid var(--line);
  background: var(--ink-800);
}

.page-faq .faq-contact__k {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--mist);
}

.page-faq .faq-contact__v {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(15px, 1.8vw, 17px);
  color: var(--cyan);
  word-break: break-all;
}

/* ---------- 底部动作 ---------- */

.page-faq .faq-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(20px, 3vw, 28px);
}

.page-faq .faq-footnote {
  margin-top: clamp(28px, 5vw, 48px);
  padding-top: 18px;
  border-top: 1px solid var(--line-soft);
}

.page-faq .faq-footnote p {
  margin: 0;
  max-width: 70ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

.page-faq .faq-footnote a {
  color: var(--cyan-soft);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-faq .faq-contact {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-faq .faq-body {
    grid-template-columns: 220px minmax(0, 1fr);
    column-gap: clamp(28px, 4vw, 64px);
  }

  .page-faq .rail__sticky {
    position: sticky;
    top: calc(var(--header-h) + 22px);
  }

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

  .page-faq .toc__link {
    padding: 8px 10px 8px 12px;
  }
}

@media (min-width: 1100px) {
  .page-faq .faq-sec__split {
    grid-template-columns: minmax(0, 1fr) 260px;
    align-items: start;
  }
}

@media (max-width: 519px) {
  .page-faq .qa__a {
    padding-left: 16px;
  }

  .page-faq .qa__n {
    min-width: 22px;
    padding-top: 5px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa__sign::after,
  .page-faq .qa,
  .page-faq .toc__link {
    transition: none;
  }
}