.page-faq {
  --faq-rule: var(--ink-700);
  --faq-rail: 212px;
  --faq-pad: clamp(16px, 3vw, 28px);
  background-color: var(--ink-900);
  color: var(--silver);
  font-family: var(--font-body);
  font-size: calc(16px * var(--font-scale));
  line-height: 1.75;
  overflow-x: hidden;
}

.page-faq .mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  border-bottom: 1px solid var(--faq-rule);
  background-image:
    linear-gradient(180deg, rgba(18, 34, 56, .92) 0%, rgba(11, 22, 34, .72) 100%),
    repeating-linear-gradient(90deg, rgba(29, 51, 80, 0) 0 95px, rgba(29, 51, 80, .5) 95px 96px);
}

.page-faq .faq-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
  padding: clamp(38px, 7vw, 86px) 0 clamp(28px, 5vw, 54px);
}

.page-faq .faq-hero__aside {
  display: flex;
  align-items: flex-start;
  gap: 18px;
  border-left: 2px solid var(--amber);
  padding-left: 14px;
}

.page-faq .faq-hero__code {
  display: inline-block;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--silver-dim);
  border: 1px solid var(--faq-rule);
  padding: 4px 8px;
}

.page-faq .faq-hero__main h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 5.4vw, 56px);
  line-height: 1.14;
  letter-spacing: .02em;
  color: var(--paper);
}

.page-faq .faq-hero__lead {
  margin: 18px 0 0;
  max-width: 62ch;
  font-size: calc(16px * var(--font-scale));
  line-height: 1.8;
  color: var(--silver);
}

.page-faq .faq-hero__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
}

.page-faq .faq-hero__chips a {
  text-decoration: none;
}

.page-faq .faq-hero__stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 30px 0 0;
  max-width: 660px;
  background-color: var(--faq-rule);
  border: 1px solid var(--faq-rule);
}

.page-faq .faq-hero__stats > div {
  background-color: var(--ink-800);
  padding: 14px 16px;
}

.page-faq .faq-hero__stats dt {
  font-size: clamp(20px, 3vw, 28px);
  line-height: 1.15;
  color: var(--amber-soft);
  letter-spacing: .02em;
}

.page-faq .faq-hero__stats dd {
  margin: 6px 0 0;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--silver-dim);
}

/* ---------- 索引区块 ---------- */
.page-faq .faq-index {
  padding: clamp(40px, 6vw, 76px) 0 clamp(48px, 7vw, 96px);
}

.page-faq .faq-index__intro {
  max-width: 66ch;
  margin: 14px 0 0;
  color: var(--silver);
}

.page-faq .faq-shell {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
  margin-top: clamp(28px, 4vw, 44px);
}

.page-faq .faq-nav {
  border-top: 2px solid var(--amber);
  padding-top: 14px;
}

.page-faq .faq-nav__title {
  margin: 0;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--silver-dim);
  text-transform: uppercase;
  font-family: var(--font-mono);
}

.page-faq .faq-nav__list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
}

.page-faq .faq-nav__link {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 9px 12px 9px 12px;
  border-left: 2px solid var(--faq-rule);
  color: var(--silver);
  font-size: 14px;
  line-height: 1.5;
  text-decoration: none;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-faq .faq-nav__link .mono {
  font-size: 12px;
  color: var(--silver-dim);
  transition: color var(--dur) var(--ease);
}

.page-faq .faq-nav__link:hover,
.page-faq .faq-nav__link:focus-visible {
  border-left-color: var(--amber);
  background-color: rgba(29, 51, 80, .5);
  color: var(--amber-soft);
}

.page-faq .faq-nav__link:hover .mono,
.page-faq .faq-nav__link:focus-visible .mono {
  color: var(--amber);
}

.page-faq .faq-nav__link:focus-visible {
  outline: 2px solid var(--amber-soft);
  outline-offset: 2px;
}

.page-faq .faq-nav .note {
  margin: 16px 0 0;
  padding-left: 12px;
}

/* ---------- 检索工具条 ---------- */
.page-faq .faq-tools {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
  padding-bottom: 30px;
  border-bottom: 1px solid var(--faq-rule);
}

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

.page-faq .faq-figure .frame__media {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 5 / 3;
  object-fit: cover;
}

.page-faq .faq-tools__filter {
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 14px;
}

.page-faq .faq-tools__filter .note {
  margin: 0;
}

/* ---------- 问题分组 ---------- */
.page-faq .faq-group {
  padding-top: clamp(26px, 4vw, 40px);
  margin-top: clamp(34px, 5vw, 56px);
  border-top: 1px solid var(--faq-rule);
  scroll-margin-top: 96px;
}

.page-faq .faq-group:first-of-type {
  border-top: 1px solid var(--faq-rule);
}

.page-faq .faq-group__head {
  display: grid;
  gap: 6px;
  border-left: 3px solid var(--amber);
  padding-left: 14px;
}

.page-faq .faq-group__no {
  font-size: 12px;
  letter-spacing: .22em;
  color: var(--amber);
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(20px, 3.2vw, 30px);
  line-height: 1.28;
  letter-spacing: .03em;
  color: var(--paper);
}

.page-faq .faq-group__note {
  margin: 0;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--silver-dim);
}

.page-faq .faq-group__intro {
  max-width: 66ch;
  margin: 16px 0 0;
  color: var(--silver);
}

.page-faq .qa-list {
  margin-top: 22px;
  border-left: 1px solid var(--faq-rule);
  padding-left: clamp(0px, 2vw, 18px);
}

/* ---------- 问答卡片 ---------- */
.page-faq .qa {
  border: 1px solid var(--faq-rule);
  border-left: 3px solid var(--ink-600);
  background-color: var(--ink-800);
  margin-bottom: 10px;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-faq .qa:last-of-type {
  margin-bottom: 0;
}

.page-faq .qa:hover {
  border-left-color: var(--amber);
  transform: translateY(-2px);
}

.page-faq .qa[open] {
  border-left-color: var(--amber);
  background-color: rgba(18, 34, 56, .96);
}

.page-faq .qa__q {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: calc(16px * var(--font-scale));
  line-height: 1.55;
  color: var(--paper);
}

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

.page-faq .qa__q::after {
  content: "+";
  margin-left: auto;
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--silver-dim);
  transition: color var(--dur) var(--ease);
}

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

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

.page-faq .qa__no {
  flex: 0 0 auto;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--silver-dim);
  transition: color var(--dur) var(--ease);
}

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

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

.page-faq .qa__a {
  padding: 0 16px 18px;
  border-top: 1px solid var(--faq-rule);
  background-color: rgba(244, 241, 233, .028);
}

.page-faq .qa__a > p {
  max-width: 68ch;
  margin: 14px 0 0;
  font-size: calc(15px * var(--font-scale));
  line-height: 1.8;
}

.page-faq .qa__a > .qa__conclusion {
  margin-top: 16px;
  padding-left: 12px;
  border-left: 2px solid var(--amber);
  font-size: calc(16px * var(--font-scale));
  font-weight: 500;
  color: var(--amber-soft);
}

.page-faq .qa__a > .qa__ref {
  margin-top: 16px;
  padding-top: 10px;
  border-top: 1px dashed var(--ink-700);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--silver-dim);
}

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

.page-faq .qa__ref a:hover,
.page-faq .qa__ref a:focus-visible {
  color: var(--amber);
}

.page-faq .faq-group__figure {
  margin: 26px 0 0;
}

.page-faq .faq-group__figure .frame__media {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 5 / 3;
  object-fit: cover;
}

/* ---------- 速查表 ---------- */
.page-faq .faq-table-wrap {
  margin-top: 22px;
  border: 1px solid var(--faq-rule);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-table {
  width: 100%;
  min-width: 560px;
  border-collapse: collapse;
  font-size: calc(15px * var(--font-scale));
}

.page-faq .faq-table__caption {
  caption-side: top;
  text-align: left;
  padding: 12px 14px;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--silver-dim);
  border-bottom: 1px solid var(--faq-rule);
}

.page-faq .faq-table th,
.page-faq .faq-table td {
  text-align: left;
  padding: 12px 14px;
  border-bottom: 1px solid var(--faq-rule);
  vertical-align: top;
}

.page-faq .faq-table thead th {
  background-color: var(--ink-800);
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--silver-dim);
  text-transform: uppercase;
}

.page-faq .faq-table tbody tr:nth-child(even) {
  background-color: rgba(18, 34, 56, .6);
}

.page-faq .faq-table tbody tr:hover {
  background-color: rgba(29, 51, 80, .62);
}

.page-faq .faq-table tbody th {
  font-weight: 500;
  color: var(--paper);
  white-space: nowrap;
}

.page-faq .faq-table tbody td {
  color: var(--silver);
}

.page-faq .faq-table td.mono {
  color: var(--amber-soft);
  white-space: nowrap;
  letter-spacing: .04em;
}

.page-faq .swatch {
  display: inline-block;
  width: 10px;
  height: 10px;
  margin-right: 9px;
  vertical-align: baseline;
}

.page-faq .swatch--a1 { background-color: var(--amber); }
.page-faq .swatch--a2 { background-color: var(--teal); }
.page-faq .swatch--a3 { background-color: var(--paper); }
.page-faq .swatch--a4 { background-color: var(--red); }
.page-faq .swatch--neutral { background-color: var(--silver-dark); }

/* ---------- 收口区块 ---------- */
.page-faq .faq-group--contact {
  border-left: 0;
}

.page-faq .faq-contact-link {
  margin: 22px 0 0;
}

.page-faq .faq-contact-link .btn {
  text-decoration: none;
}

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .page-faq .note--vertical {
    writing-mode: horizontal-tb;
    transform: none;
  }

  .page-faq .faq-nav {
    border-top-width: 1px;
  }

  .page-faq .faq-nav__list {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
  }

  .page-faq .faq-nav__link {
    border-left: 0;
    border-bottom: 2px solid var(--faq-rule);
    padding: 7px 10px;
  }

  .page-faq .faq-nav__link:hover,
  .page-faq .faq-nav__link:focus-visible {
    border-left-color: transparent;
    border-bottom-color: var(--amber);
  }

  .page-faq .faq-nav .note {
    padding-left: 0;
  }

  .page-faq .qa-list {
    padding-left: 0;
    border-left: 0;
  }
}

@media (min-width: 561px) {
  .page-faq .faq-hero__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 901px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }

  .page-faq .faq-hero__aside {
    flex-direction: column;
    align-items: flex-start;
    gap: 24px;
    padding-top: 6px;
  }

  .page-faq .faq-shell {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
    gap: 52px;
  }

  .page-faq .faq-nav {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-faq .faq-tools {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: 34px;
    align-items: stretch;
  }
}

@media (min-width: 1100px) {
  .page-faq .qa__a {
    padding-left: 24px;
    padding-right: 24px;
  }
}

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

  .page-faq .qa:hover {
    transform: none;
  }
}

@media print {
  .page-faq .faq-hero__chips,
  .page-faq .faq-tools__filter,
  .page-faq .faq-contact-link {
    display: none;
  }

  .page-faq .qa {
    break-inside: avoid;
    border-color: #999;
  }
}