.page-faq {
  --faq-rail-w: 240px;
  --faq-sticky-top: 132px;
  --faq-line: 1px solid var(--mist);
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(20px, 3.4vw, 40px) clamp(44px, 6vw, 92px);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  right: 5%;
  bottom: 0;
  width: min(260px, 30vw);
  height: min(420px, 70%);
  border-inline: 2px solid rgba(0, 229, 204, 0.32);
  background:
    linear-gradient(180deg, transparent 0%, rgba(0, 229, 204, 0.14) 52%, rgba(255, 107, 53, 0.2) 100%);
  pointer-events: none;
  opacity: 0.85;
}

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

.page-faq .faq-hero__crumb .breadcrumb__link {
  color: var(--mist);
}

.page-faq .faq-hero__crumb .breadcrumb__item:last-child .breadcrumb__link {
  color: var(--cyan);
}

.page-faq .faq-hero__kicker {
  margin: clamp(20px, 3vw, 34px) 0 0;
  color: var(--signal);
}

.page-faq .faq-hero__title {
  margin: 14px 0 0;
  max-width: 24ch;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(30px, 5.2vw, 68px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-faq .faq-hero__lede {
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  max-width: 62ch;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(16px, 1.5vw, 20px);
  line-height: 1.85;
  color: var(--paper);
}

/* ---------- 检索条 ---------- */

.page-faq .faq-search {
  margin-top: clamp(28px, 4vw, 46px);
  max-width: 780px;
  padding: 18px clamp(16px, 2.2vw, 26px) 20px;
  background: var(--ink-deep);
  border: 2px solid var(--cyan);
  box-shadow: 8px 8px 0 rgba(0, 229, 204, 0.16);
  display: grid;
  gap: 12px;
}

.page-faq .faq-search__field {
  margin: 0;
  padding-bottom: 12px;
  border-bottom: 1px dashed rgba(216, 220, 227, 0.4);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-faq .faq-search__meta {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

.page-faq .faq-search__meta .mono {
  color: var(--paper);
  font-weight: 700;
}

.page-faq .faq-search__jump {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 2px 0 0;
  padding: 0;
  list-style: none;
}

/* ---------- 分类索引 ---------- */

.page-faq .faq-index {
  padding-block: var(--space-section);
}

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

.page-faq .faq-index__figure {
  margin: 0 0 clamp(28px, 4vw, 46px);
}

.page-faq .faq-index__grid {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  border-top: 2px solid var(--ink);
}

.page-faq .faq-index__cell a {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-areas:
    "num name"
    "num desc";
  align-items: baseline;
  gap: 2px 14px;
  padding: 15px 4px;
  border-bottom: var(--faq-line);
  color: var(--ink);
  text-decoration: none;
  transition: background-color 0.2s var(--ease), padding-left 0.2s var(--ease);
}

.page-faq .faq-index__cell a:hover,
.page-faq .faq-index__cell a:focus-visible {
  background: var(--paper-2);
  padding-left: 12px;
}

.page-faq .faq-index__num {
  grid-area: num;
  color: var(--signal);
  font-size: 15px;
  font-weight: 700;
  align-self: start;
}

.page-faq .faq-index__name {
  grid-area: name;
  font-weight: 900;
  font-size: 17px;
  letter-spacing: -0.01em;
}

.page-faq .faq-index__desc {
  grid-area: desc;
  color: var(--slate);
  font-size: 14px;
  line-height: 1.6;
}

@media (min-width: 720px) {
  .page-faq .faq-index__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(24px, 3vw, 52px);
  }
}

@media (min-width: 1120px) {
  .page-faq .faq-index__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 问答主体布局 ---------- */

.page-faq .faq-body {
  padding-block: var(--space-section);
}

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 60px);
}

@media (min-width: 1000px) {
  .page-faq .faq-layout {
    grid-template-columns: minmax(0, var(--faq-rail-w)) minmax(0, 1fr);
    align-items: start;
  }
}

/* ---------- 左侧粘性索引 ---------- */

.page-faq .faq-rail__title {
  margin: 0 0 10px;
  color: var(--slate);
}

.page-faq .faq-rail__list {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  border: var(--faq-line);
  background: var(--paper);
  color: var(--slate);
  font-size: 14px;
  white-space: nowrap;
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  color: var(--ink);
  border-color: var(--signal);
}

.page-faq .faq-rail__link.is-active {
  color: var(--signal);
  border-color: var(--signal);
  background: var(--paper-2);
}

.page-faq .faq-rail__no {
  font-size: 12px;
  letter-spacing: 0.05em;
}

@media (min-width: 1000px) {
  .page-faq .faq-rail {
    position: sticky;
    top: var(--faq-sticky-top);
    align-self: start;
  }

  .page-faq .faq-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 0;
    border-left: 2px solid var(--mist);
  }

  .page-faq .faq-rail__link {
    display: flex;
    width: 100%;
    border: 0;
    border-left: 2px solid transparent;
    background: transparent;
    margin-left: -2px;
    padding: 9px 12px;
  }

  .page-faq .faq-rail__link.is-active {
    background: rgba(216, 220, 227, 0.5);
    border-left-color: var(--signal);
  }
}

/* ---------- 问答分类 ---------- */

.page-faq .faq-main {
  display: grid;
  gap: clamp(38px, 5vw, 68px);
  min-width: 0;
}

.page-faq .faq-cat {
  scroll-margin-top: 120px;
  min-width: 0;
}

.page-faq .faq-cat__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 16px;
  align-items: baseline;
  padding-bottom: 12px;
  margin-bottom: 6px;
  border-bottom: 2px solid var(--ink);
}

.page-faq .faq-cat__no {
  grid-row: 1 / span 2;
  font-size: clamp(26px, 3.4vw, 42px);
  font-weight: 700;
  line-height: 1;
  color: var(--signal);
}

.page-faq .faq-cat__title {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(21px, 2.3vw, 30px);
  line-height: 1.25;
  letter-spacing: -0.01em;
}

.page-faq .faq-cat__note {
  margin: 0;
  color: var(--slate);
  font-size: 15px;
  line-height: 1.65;
}

/* ---------- 折叠问答 ---------- */

.page-faq .faq-cat .fold {
  position: relative;
  border-bottom: var(--faq-line);
  transition: padding-left 0.25s var(--ease);
}

.page-faq .faq-cat .fold[open] {
  padding-left: 16px;
}

.page-faq .faq-cat .fold[open]::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 3px;
  background: var(--cyan);
}

.page-faq .faq-cat .fold__sum {
  position: relative;
  padding: 16px 32px 16px 0;
  cursor: pointer;
  list-style: none;
  color: var(--ink);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.65;
}

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

.page-faq .faq-cat .fold__sum::after {
  content: "+";
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 20px;
  color: var(--signal);
  transition: transform 0.25s var(--ease), color 0.25s var(--ease);
}

.page-faq .faq-cat .fold[open] .fold__sum::after {
  content: "–";
  color: var(--cyan);
}

.page-faq .faq-cat .fold__sum:hover::after {
  transform: translateY(-50%) scale(1.2);
}

.page-faq .faq-cat .fold__body {
  padding: 0 0 22px;
}

.page-faq .faq-cat .fold__body p {
  margin: 0 0 12px;
  max-width: 70ch;
  line-height: 1.8;
}

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

.page-faq .answer-lead {
  max-width: 68ch;
  padding: 10px 14px;
  border-left: 3px solid var(--cyan);
  background: linear-gradient(90deg, rgba(0, 229, 204, 0.14), transparent 72%);
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 17px;
  color: var(--ink);
}

/* ---------- 步骤列表 ---------- */

.page-faq .steps {
  margin: 0 0 14px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-faq .steps li {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  max-width: 70ch;
  line-height: 1.75;
}

.page-faq .steps__no {
  display: grid;
  place-items: center;
  min-height: 24px;
  padding: 2px 4px;
  border: 1px solid var(--signal);
  color: var(--signal);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  margin-top: 3px;
}

/* ---------- 权益档位 ---------- */

.page-faq .tiers {
  margin: 0 0 14px;
  display: grid;
  gap: 6px;
  max-width: 560px;
}

.page-faq .tiers__row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 14px;
  padding: 9px 14px;
  background: var(--paper);
  border-left: 3px solid var(--signal);
}

.page-faq .tiers__row dt {
  margin: 0;
  font-weight: 700;
  font-size: 16px;
}

.page-faq .tiers__row dd {
  margin: 0;
  color: var(--slate);
  font-size: 15px;
  letter-spacing: 0.05em;
}

/* ---------- 图表与操作 ---------- */

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

.page-faq .answer-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 16px;
}

.page-faq .answer-actions .copy-btn {
  font-size: 14px;
}

/* ---------- 联系支持强调 ---------- */

.page-faq .faq-cat--support .faq-cat__head {
  border-bottom-color: var(--signal);
}

.page-faq .faq-cat--support .fold[open] {
  background: linear-gradient(90deg, rgba(255, 107, 53, 0.08), transparent 78%);
}

.page-faq .faq-cat--support .fold[open]::before {
  background: var(--signal);
}

/* ---------- 窄屏收敛 ---------- */

@media (max-width: 560px) {
  .page-faq .faq-hero::after {
    display: none;
  }

  .page-faq .faq-search {
    box-shadow: 4px 4px 0 rgba(0, 229, 204, 0.16);
  }

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

  .page-faq .faq-rail__list {
    margin-inline: -16px;
    padding-inline: 16px;
  }

  .page-faq .faq-cat .fold[open] {
    padding-left: 12px;
  }

  .page-faq .faq-cat .fold__sum {
    padding-right: 26px;
    font-size: 16px;
  }

  .page-faq .steps li {
    grid-template-columns: 30px minmax(0, 1fr);
    gap: 10px;
  }
}