.page-faq {
  --faq-hair: rgba(53, 240, 200, 0.22);
  --faq-glow: rgba(53, 240, 200, 0.09);
  padding-bottom: 64px;
}

.page-faq .faq-crumbs {
  padding-top: 18px;
  font-size: 12px;
  letter-spacing: 0.04em;
}

.page-faq .faq-crumbs .breadcrumbs__item {
  color: var(--mute);
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  padding: 26px 0 4px;
  background: radial-gradient(125% 88% at 88% 0%, rgba(53, 240, 200, 0.13), transparent 62%);
}

.page-faq .faq-hero__kicker {
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--amber);
  margin: 0 0 14px;
}

.page-faq .faq-hero__title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(30px, 8.6vw, 58px);
  line-height: 1.06;
  letter-spacing: -0.01em;
  color: var(--paper);
  margin: 0;
  max-width: 22ch;
}

.page-faq .faq-hero__mark {
  font-style: normal;
  color: var(--cyan);
}

.page-faq .faq-hero__lede {
  margin: 16px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 检索条 ---------- */

.page-faq .faq-search {
  position: relative;
  margin-top: 24px;
  padding: 14px 16px 12px;
  background: var(--panel);
  border: 2px solid var(--line);
  box-shadow: var(--shadow-hard);
}

.page-faq .faq-search__label {
  display: block;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--cyan);
  margin-bottom: 6px;
}

.page-faq .faq-search__input {
  display: block;
  width: 100%;
  box-sizing: border-box;
  padding: 9px 2px;
  background: transparent;
  border: 0;
  border-bottom: 1.5px solid var(--rule);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.01em;
}

.page-faq .faq-search__input::placeholder {
  color: var(--mute);
}

.page-faq .faq-search__input:focus {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-bottom-color: var(--cyan);
}

.page-faq .faq-search__hint {
  margin: 9px 0 0;
  font-size: 12px;
  line-height: 1.6;
  color: var(--mute);
}

.page-faq .faq-empty {
  margin: 18px 0 0;
  padding: 12px 14px;
  border: 2px solid var(--line);
  border-left: 3px solid var(--amber);
  background: rgba(255, 174, 59, 0.08);
  color: var(--mist);
  font-size: 13px;
  line-height: 1.7;
}

/* ---------- 双列骨架 ---------- */

.page-faq .faq-layout {
  display: grid;
  gap: 22px;
  padding-top: 26px;
}

/* ---------- 分类索引 ---------- */

.page-faq .faq-index {
  position: sticky;
  top: var(--bar-h);
  z-index: 20;
  padding: 10px;
  background: var(--panel);
  border: 2px solid var(--line);
  box-shadow: var(--shadow-hard);
}

.page-faq .faq-index__title {
  display: none;
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--mute);
}

.page-faq .faq-index__list {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: max-content;
  gap: 8px;
  margin: 0;
  padding: 0 0 2px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-faq .faq-index__list::-webkit-scrollbar {
  display: none;
}

.page-faq .faq-index__link {
  display: grid;
  grid-template-columns: auto auto;
  gap: 8px;
  align-items: center;
  padding: 7px 11px;
  border: 1px solid var(--rule);
  border-left: 3px solid transparent;
  color: var(--mist);
  text-decoration: none;
  font-size: 13px;
  white-space: nowrap;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.page-faq .faq-index__code {
  font-size: 12px;
  color: var(--mute);
  transition: color 0.2s ease;
}

.page-faq .faq-index__count {
  display: none;
  font-size: 11px;
  color: var(--mute);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  background: var(--faq-glow);
  border-left-color: var(--cyan);
  color: var(--paper);
}

.page-faq .faq-index__link:hover .faq-index__code,
.page-faq .faq-index__link:focus-visible .faq-index__code {
  color: var(--cyan);
}

/* ---------- 分类区块 ---------- */

.page-faq .faq-block {
  margin-bottom: 34px;
  scroll-margin-top: calc(var(--bar-h) + 68px);
}

.page-faq .faq-block__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 12px;
  padding-bottom: 12px;
  margin-bottom: 16px;
  border-bottom: 2px solid var(--faq-hair);
}

.page-faq .faq-block__code {
  flex: 0 0 auto;
  padding: 2px 9px;
  background: var(--cyan);
  color: var(--ink);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  transition: background 0.2s ease;
}

.page-faq .faq-block:target .faq-block__code {
  background: var(--amber);
}

.page-faq .faq-block__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: 24px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-faq .faq-block__note {
  flex: 1 1 100%;
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mute);
}

/* ---------- 问答卡片 ---------- */

.page-faq .faq-item {
  margin-bottom: 12px;
  background: var(--panel);
  border: 2px solid var(--line);
  box-shadow: var(--shadow-hard);
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

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

.page-faq .faq-item:hover {
  border-color: var(--faq-hair);
  transform: translate(-1px, -1px);
  box-shadow: var(--shadow-push);
}

.page-faq .faq-item[open] {
  border-color: var(--faq-hair);
}

.page-faq .faq-item__summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  grid-template-areas:
    "code title mark"
    "code excerpt excerpt";
  gap: 3px 12px;
  align-items: center;
  padding: 14px 15px;
  cursor: pointer;
  list-style: none;
}

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

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

.page-faq .faq-item__code {
  grid-area: code;
  align-self: start;
  padding-top: 2px;
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--cyan);
  border-left: 2px solid var(--cyan);
  padding-left: 7px;
}

.page-faq .faq-item__title {
  grid-area: title;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--paper);
}

.page-faq .faq-item__excerpt {
  grid-area: excerpt;
  font-size: 12.5px;
  line-height: 1.62;
  color: var(--mute);
}

.page-faq .faq-item__mark {
  grid-area: mark;
  align-self: center;
  width: 0;
  height: 0;
  border-left: 7px solid var(--cyan);
  border-top: 5px solid transparent;
  border-bottom: 5px solid transparent;
  transition: transform 0.2s ease;
}

.page-faq .faq-item[open] .faq-item__mark {
  transform: rotate(90deg);
  border-left-color: var(--amber);
}

.page-faq .faq-item__body {
  padding: 0 15px 16px;
  border-top: 1px solid var(--rule-soft);
}

.page-faq .faq-steps {
  display: grid;
  gap: 10px;
  margin: 13px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: faqstep;
}

.page-faq .faq-steps > li {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 10px;
  counter-increment: faqstep;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

.page-faq .faq-steps > li::before {
  content: counter(faqstep, decimal-leading-zero);
  align-self: start;
  padding-left: 7px;
  border-left: 2px solid var(--cyan);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

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

.page-faq .faq-steps a:hover,
.page-faq .faq-steps a:focus-visible {
  color: var(--cyan-hi);
}

.page-faq .faq-item__note {
  margin: 14px 0 0;
  padding-left: 10px;
  border-left: 2px solid var(--rule);
  font-size: 13px;
  line-height: 1.72;
  color: var(--mute);
}

/* ---------- 章节配图 ---------- */

.page-faq .faq-visual {
  margin: 0 0 16px;
}

.page-faq .faq-visual img {
  max-height: 200px;
  object-fit: cover;
}

.page-faq .faq-split {
  display: grid;
  gap: 16px;
}

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

/* ---------- 联系区块 ---------- */

.page-faq .faq-block--contact {
  padding-top: 4px;
}

.page-faq .faq-block--contact .faq-block__code {
  background: var(--amber);
}

/* ---------- 断点 ---------- */

@media (min-width: 640px) {
  .page-faq .faq-hero {
    padding-top: 34px;
  }

  .page-faq .faq-search {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: 4px 20px;
  }

  .page-faq .faq-search__label {
    grid-column: 1 / -1;
  }

  .page-faq .faq-search__hint {
    margin: 0 0 8px;
    max-width: 22ch;
    text-align: right;
  }

  .page-faq .faq-visual img {
    max-height: 250px;
  }

  .page-faq .faq-split {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    align-items: start;
    gap: 20px;
  }

  .page-faq .faq-split__figure img {
    max-height: 260px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-layout {
    grid-template-columns: 236px minmax(0, 1fr);
    gap: 34px;
    align-items: start;
  }

  .page-faq .faq-index {
    top: calc(var(--bar-h) + 20px);
    padding: 16px 14px;
  }

  .page-faq .faq-index__title {
    display: block;
  }

  .page-faq .faq-index__list {
    grid-auto-flow: row;
    grid-auto-columns: auto;
    gap: 4px;
    overflow: visible;
  }

  .page-faq .faq-index__link {
    grid-template-columns: 22px minmax(0, 1fr) auto;
    gap: 10px;
    padding: 9px 8px;
    border: 0;
    border-left: 3px solid transparent;
    white-space: normal;
    font-size: 13px;
  }

  .page-faq .faq-index__count {
    display: block;
  }

  .page-faq .faq-block {
    scroll-margin-top: calc(var(--bar-h) + 24px);
    margin-bottom: 46px;
  }

  .page-faq .faq-block__title {
    font-size: 27px;
  }

  .page-faq .faq-item__summary {
    padding: 16px 18px;
  }

  .page-faq .faq-item__body {
    padding: 0 18px 18px;
  }

  .page-faq .faq-item__title {
    font-size: 16px;
  }

  .page-faq .faq-visual img {
    max-height: 320px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item,
  .page-faq .faq-item__mark,
  .page-faq .faq-index__link,
  .page-faq .faq-block__code {
    transition: none;
  }
}