.page-faq {
  --faq-rail-w: 84px;
  --faq-tick: rgba(23, 196, 214, 0.35);
  --faq-tick-soft: rgba(23, 196, 214, 0.12);
  padding-block-end: 80px;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  display: grid;
  gap: 18px;
  max-width: 780px;
  padding-block: 30px 6px;
}

.page-faq .faq-hero__kicker {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan-500);
}

.page-faq .faq-hero__kicker::before {
  content: "";
  flex: 0 0 auto;
  width: 36px;
  height: 2px;
  background: var(--cyan-500);
}

.page-faq .faq-hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(32px, 8vw, 46px);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--paper-050);
}

.page-faq .faq-hero .lede {
  margin: 0;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--body-text);
}

.page-faq .faq-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  padding-top: 16px;
  border-top: 1px solid var(--ink-700);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--slate-400);
}

/* ---------- 区块骨架 ---------- */
.page-faq .faq-block {
  padding-block: 42px;
}

.page-faq .faq-block__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  border-top: 1px solid var(--ink-700);
  padding-top: 30px;
}

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

.page-faq .faq-rail {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 12px;
  color: var(--slate-400);
}

.page-faq .faq-rail__num {
  letter-spacing: 0.12em;
  color: var(--cyan-500);
}

.page-faq .faq-rail__line {
  flex: 1 1 auto;
  height: 1px;
  background: linear-gradient(90deg, var(--faq-tick), transparent);
}

.page-faq .faq-block__body > p {
  margin: 0 0 20px;
  max-width: 42em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--body-text);
}

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

.page-faq .faq-block__body a {
  color: var(--blue-300);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .faq-block__body a:hover {
  color: var(--cyan-500);
}

/* ---------- 分类索引 ---------- */
.page-faq .faq-overview {
  display: grid;
  gap: 30px;
  margin-top: 20px;
}

.page-faq .faq-overview__text > p {
  margin: 0 0 22px;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--body-text);
}

.page-faq .doc-index {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--ink-700);
}

.page-faq .doc-index__item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  padding: 15px 0;
  border-bottom: 1px solid var(--ink-700);
  transition: background-color 0.18s var(--ease);
}

.page-faq .doc-index__item:hover {
  background-color: rgba(23, 196, 214, 0.04);
}

.page-faq .doc-index__no {
  padding-top: 3px;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--cyan-500);
}

.page-faq .doc-index__name {
  margin: 0 0 4px;
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--paper-050);
}

.page-faq .doc-index__desc {
  margin: 0;
  max-width: 36em;
  font-size: 14px;
  line-height: 1.72;
  color: var(--slate-400);
}

/* ---------- 图片容器 ---------- */
.page-faq .faq-media {
  margin: 0;
}

.page-faq .img-frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--ink-700);
  background-color: var(--ink-900);
  background-image:
    linear-gradient(var(--faq-tick-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--faq-tick-soft) 1px, transparent 1px);
  background-size: 32px 32px;
  box-shadow: 6px 6px 0 -1px var(--ink-700);
}

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

.page-faq .img-frame__cap {
  margin: 0;
  padding: 10px 14px;
  border-top: 1px solid var(--ink-700);
  background-color: var(--ink-900);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--slate-400);
}

/* ---------- 可筛选文档条目 ---------- */
.page-faq .faq-catalog {
  margin-top: 44px;
  padding-top: 30px;
  border-top: 1px solid var(--ink-700);
}

.page-faq .faq-catalog__head h3 {
  margin: 0 0 8px;
  font-size: 20px;
  letter-spacing: -0.01em;
  color: var(--paper-050);
}

.page-faq .faq-catalog__head .hint {
  margin: 0 0 20px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--slate-400);
}

.page-faq .faq-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 22px;
}

.page-faq .faq-filter__btn {
  padding: 7px 12px;
  border: 1px solid var(--ink-700);
  background-color: transparent;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--slate-400);
  cursor: pointer;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease), background-color 0.18s var(--ease);
}

.page-faq .faq-filter__btn:hover {
  color: var(--blue-300);
  border-color: var(--blue-300);
}

.page-faq .faq-filter__btn[aria-pressed="true"] {
  color: var(--ink-950);
  background-color: var(--cyan-500);
  border-color: var(--cyan-500);
}

.page-faq .doc-list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .doc-list__item {
  position: relative;
  padding: 16px 18px 16px 22px;
  border: 1px solid var(--ink-700);
  background-color: var(--ink-900);
}

.page-faq .doc-list__item::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 3px;
  background-color: var(--cyan-500);
}

.page-faq .doc-list__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 8px;
}

.page-faq .doc-list__no {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cyan-500);
}

.page-faq .doc-list__head .copy-btn {
  padding: 3px 9px;
  border: 1px solid var(--ink-700);
  background-color: transparent;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--slate-400);
  cursor: pointer;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-faq .doc-list__head .copy-btn:hover {
  color: var(--blue-300);
  border-color: var(--blue-300);
}

.page-faq .doc-list__head .copy-btn.is-copied {
  color: var(--amber-500);
  border-color: var(--amber-500);
}

.page-faq .doc-list__title {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--paper-050);
}

.page-faq .doc-list__meta {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--slate-400);
}

/* ---------- 安全前提 ---------- */
.page-faq .faq-guard {
  margin: 0 0 24px;
  padding: 13px 16px 13px 18px;
  border-left: 3px solid var(--amber-500);
  background-image: linear-gradient(90deg, rgba(255, 138, 61, 0.08), rgba(255, 138, 61, 0) 62%);
}

.page-faq .faq-guard__label {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--amber-500);
}

.page-faq .faq-guard p {
  margin: 0;
  max-width: 42em;
  font-size: 15px;
  line-height: 1.75;
  color: var(--body-text);
}

/* ---------- 步骤列表 ---------- */
.page-faq .faq-steps {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--ink-700);
}

.page-faq .faq-steps__item {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-bottom: 1px solid var(--ink-700);
}

.page-faq .faq-steps__no {
  padding-top: 3px;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--cyan-500);
}

.page-faq .faq-steps__item h3 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--paper-050);
}

.page-faq .faq-steps__item p {
  margin: 0;
  max-width: 42em;
  font-size: 15px;
  line-height: 1.78;
  color: var(--body-text);
}

/* ---------- 区块确认刻度 ---------- */
.page-faq .block-ticks {
  display: grid;
  gap: 10px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .block-ticks__item {
  padding: 13px 14px 15px;
  border: 1px solid var(--ink-700);
  border-top: 2px solid var(--cyan-500);
  background-color: var(--ink-900);
}

.page-faq .block-ticks__item:last-child {
  border-top-color: var(--mint-400);
}

.page-faq .block-ticks__n {
  display: block;
  margin-bottom: 6px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cyan-500);
}

.page-faq .block-ticks__item:last-child .block-ticks__n {
  color: var(--mint-400);
}

.page-faq .block-ticks__t {
  margin: 0;
  font-size: 14px;
  line-height: 1.68;
  color: var(--body-text);
}

/* ---------- 核对清单 ---------- */
.page-faq .faq-check {
  margin-top: 28px;
  padding-top: 22px;
  border-top: 1px solid var(--ink-700);
}

.page-faq .faq-check__title {
  margin: 0 0 12px;
  font-size: 17px;
  font-weight: 600;
  color: var(--paper-050);
}

.page-faq .faq-check .bullets {
  margin: 0;
  padding-left: 1.15em;
}

.page-faq .faq-check .bullets li {
  margin-bottom: 8px;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.75;
  color: var(--body-text);
}

/* ---------- 手风琴 ---------- */
.page-faq .faq-acc {
  margin-top: 20px;
  border-top: 1px solid var(--ink-700);
}

.page-faq .faq-acc__item {
  border-bottom: 1px solid var(--ink-700);
}

.page-faq .faq-acc__item > summary {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  padding: 18px 0;
  list-style: none;
  cursor: pointer;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--paper-050);
  transition: color 0.18s var(--ease);
}

.page-faq .faq-acc__item > summary::-webkit-details-marker {
  display: none;
}

.page-faq .faq-acc__item > summary::after {
  content: "+";
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  padding-top: 2px;
  color: var(--cyan-500);
}

.page-faq .faq-acc__item > summary:hover {
  color: var(--blue-300);
}

.page-faq .faq-acc__item[open] > summary {
  color: var(--cyan-500);
}

.page-faq .faq-acc__item[open] > summary::after {
  content: "–";
  color: var(--amber-500);
}

.page-faq .faq-acc__body {
  padding: 0 0 22px 16px;
  border-left: 2px solid var(--cyan-500);
}

.page-faq .faq-acc__guard {
  margin: 0 0 12px;
  max-width: 42em;
  font-size: 14px;
  line-height: 1.72;
  color: var(--slate-400);
}

.page-faq .faq-acc__steps {
  margin: 0;
  padding-left: 1.2em;
}

.page-faq .faq-acc__steps li {
  margin-bottom: 8px;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.75;
  color: var(--body-text);
}

/* ---------- 尾部 ---------- */
.page-faq .faq-tail {
  padding-block: 12px 0;
}

.page-faq .faq-tail__panel {
  padding: 28px 24px 30px;
  box-shadow: 8px 8px 0 -1px var(--ink-700);
}

.page-faq .faq-tail__panel h2 {
  margin: 10px 0 12px;
  font-size: 22px;
  letter-spacing: -0.01em;
  color: var(--paper-050);
}

.page-faq .faq-tail__panel p {
  margin: 0 0 22px;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.78;
  color: var(--body-text);
}

.page-faq .faq-tail__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-faq .block-ticks {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-faq .doc-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }
}

@media (min-width: 860px) {
  .page-faq {
    --faq-rail-w: 96px;
  }

  .page-faq .faq-hero {
    padding-block: 44px 10px;
  }

  .page-faq .faq-block {
    padding-block: 58px;
  }

  .page-faq .faq-block__grid {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: 44px;
    padding-top: 40px;
  }

  .page-faq .faq-rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    position: sticky;
    top: 104px;
  }

  .page-faq .faq-rail__line {
    flex: 0 0 auto;
    width: 1px;
    height: 72px;
    background: linear-gradient(180deg, var(--faq-tick), transparent);
  }

  .page-faq .faq-overview {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 44px;
    align-items: start;
  }

  .page-faq .section-head__title {
    max-width: 22em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .doc-index__item,
  .page-faq .faq-filter__btn,
  .page-faq .doc-list__head .copy-btn,
  .page-faq .faq-acc__item > summary {
    transition: none;
  }
}
</main>