.page-faq {
  --faq-line: rgba(30, 42, 58, 0.14);
  --faq-tint: rgba(214, 204, 184, 0.42);
  --faq-open: rgba(232, 225, 211, 0.62);
  background: var(--tb-paper);
  color: var(--tb-ink);
  font-family: var(--tb-font-body);
}

/* ── 页头 ───────────────────────────────── */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: 34px 0 46px;
  background:
    radial-gradient(120% 150% at 88% 4%, rgba(58, 157, 138, 0.24), transparent 56%),
    radial-gradient(90% 120% at 4% 100%, rgba(74, 63, 107, 0.28), transparent 60%),
    var(--tb-ink);
  color: var(--tb-paper);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 7px;
  background: repeating-linear-gradient(90deg, var(--tb-gold) 0 2px, transparent 2px 13px);
  opacity: 0.5;
}

.page-faq .faq-hero__inner {
  display: grid;
  gap: 30px;
}

.page-faq .faq-crumbs {
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: rgba(232, 225, 211, 0.6);
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 22px;
}

.page-faq .faq-crumbs a {
  color: rgba(232, 225, 211, 0.82);
  text-decoration: none;
  border-bottom: 1px solid rgba(176, 141, 87, 0.6);
}

.page-faq .faq-crumbs a:hover {
  color: var(--tb-copper-lit);
  border-bottom-color: var(--tb-copper-lit);
}

.page-faq .faq-crumbs__sep {
  color: var(--tb-gold);
}

.page-faq .faq-hero__kicker {
  font-family: var(--tb-font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.2em;
  color: var(--tb-gold);
  margin: 0 0 14px;
}

.page-faq .faq-hero__title {
  font-family: var(--tb-font-head);
  font-weight: 700;
  font-size: clamp(2.1rem, 8.6vw, 3.9rem);
  line-height: 1.06;
  letter-spacing: 0.01em;
  margin: 0 0 18px;
}

.page-faq .faq-hero__title span {
  display: block;
  margin-top: 10px;
  font-size: clamp(1.0625rem, 3.4vw, 1.5rem);
  font-weight: 600;
  line-height: 1.5;
  color: var(--tb-copper-lit);
  letter-spacing: 0.02em;
}

.page-faq .faq-hero__lead {
  font-size: 0.9375rem;
  line-height: 1.9;
  color: rgba(232, 225, 211, 0.86);
  max-width: 48ch;
  margin: 0;
}

.page-faq .faq-hero__figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 18px;
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid rgba(232, 225, 211, 0.22);
}

.page-faq .faq-figure__num {
  display: block;
  font-family: var(--tb-font-mono);
  font-size: 1.375rem;
  color: var(--tb-gold);
  letter-spacing: 0.02em;
}

.page-faq .faq-figure__label {
  display: block;
  margin-top: 4px;
  font-size: 0.75rem;
  line-height: 1.5;
  color: rgba(232, 225, 211, 0.68);
}

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

.page-faq .faq-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 3px 34px 3px 3px;
  border: 1px solid rgba(232, 225, 211, 0.28);
  object-fit: cover;
}

.page-faq .faq-hero__media figcaption {
  margin-top: 9px;
  font-size: 0.75rem;
  letter-spacing: 0.03em;
  color: rgba(232, 225, 211, 0.6);
}

/* ── 主体分栏 ───────────────────────────── */
.page-faq .faq-body {
  display: grid;
  gap: 34px;
  padding: 40px 0 76px;
}

.page-faq .faq-toc {
  border: 1px solid var(--faq-line);
  background: var(--faq-tint);
  border-radius: 3px 22px 3px 3px;
  padding: 16px;
}

.page-faq .faq-toc__title {
  font-family: var(--tb-font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  color: var(--tb-copper);
  margin: 0 0 12px;
}

.page-faq .faq-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-faq .faq-toc__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 11px;
  font-size: 0.875rem;
  line-height: 1.4;
  color: var(--tb-ink);
  text-decoration: none;
  border: 1px solid var(--faq-line);
  background: rgba(232, 225, 211, 0.72);
  border-radius: 2px;
  transition: border-color 0.18s ease, background-color 0.18s ease, transform 0.18s ease;
}

.page-faq .faq-toc__link:hover {
  border-color: var(--tb-copper);
  background: var(--tb-paper);
  transform: translateX(2px);
}

.page-faq .faq-toc__link:focus-visible {
  outline: 2px solid var(--tb-copper-lit);
  outline-offset: 2px;
}

.page-faq .faq-toc__num {
  font-family: var(--tb-font-mono);
  font-size: 0.6875rem;
  color: var(--tb-gold);
}

/* ── 分区 ───────────────────────────────── */
.page-faq .faq-section {
  padding-bottom: 34px;
  margin-bottom: 34px;
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .faq-section--band {
  background: var(--tb-paper-deep);
  border: 1px solid var(--faq-line);
  border-radius: 3px 30px 3px 3px;
  padding: 24px 18px 30px;
}

.page-faq .faq-section--last {
  border-bottom: 0;
  padding-bottom: 0;
  margin-bottom: 0;
}

.page-faq .faq-section__head {
  margin-bottom: 6px;
}

.page-faq .faq-section__eyebrow {
  font-family: var(--tb-font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.2em;
  color: var(--tb-gold);
  margin: 0;
}

.page-faq .faq-section__title {
  font-family: var(--tb-font-head);
  font-weight: 700;
  font-size: clamp(1.5rem, 4.6vw, 2.1rem);
  line-height: 1.2;
  margin: 8px 0 10px;
}

.page-faq .faq-section__lead {
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--tb-graphite);
  max-width: 62ch;
  margin: 0;
}

/* ── 折页问答 ───────────────────────────── */
.page-faq .faq-list {
  margin-top: 18px;
  border-top: 1px solid var(--faq-line);
}

.page-faq .faq-item {
  border-bottom: 1px solid var(--faq-line);
  transition: background-color 0.2s ease;
}

.page-faq .faq-item[open] {
  background: var(--faq-open);
}

.page-faq .faq-item > summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 12px;
  align-items: start;
  padding: 15px 12px;
  cursor: pointer;
  list-style: none;
  transition: background-color 0.18s ease;
}

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

.page-faq .faq-item > summary::marker {
  content: "";
}

.page-faq .faq-item > summary:hover {
  background: rgba(47, 107, 94, 0.08);
}

.page-faq .faq-item > summary:focus-visible {
  outline: 2px solid var(--tb-copper-lit);
  outline-offset: -2px;
}

.page-faq .faq-item__no {
  font-family: var(--tb-font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.06em;
  color: var(--tb-cinnabar);
  padding-top: 0.3em;
}

.page-faq .faq-item__q {
  font-family: var(--tb-font-head);
  font-weight: 600;
  font-size: 1.0625rem;
  line-height: 1.55;
  color: var(--tb-ink);
}

.page-faq .faq-item__toggle {
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  margin-top: 2px;
  border: 1px solid var(--faq-line);
  border-radius: 50%;
  font-family: var(--tb-font-mono);
  font-size: 1rem;
  line-height: 1;
  color: var(--tb-copper);
  transition: border-color 0.18s ease, background-color 0.18s ease;
}

.page-faq .faq-item__toggle::before {
  content: "+";
}

.page-faq .faq-item[open] .faq-item__toggle::before {
  content: "–";
}

.page-faq .faq-item[open] .faq-item__toggle {
  border-color: var(--tb-copper);
  background: rgba(58, 157, 138, 0.14);
}

.page-faq .faq-answer {
  display: grid;
  gap: 10px;
  padding: 0 12px 20px;
  animation: faq-fold 0.22s ease-out;
}

@keyframes faq-fold {
  from {
    opacity: 0;
    transform: translateY(-5px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.page-faq .faq-answer__no {
  font-family: var(--tb-font-mono);
  font-size: 0.6875rem;
  line-height: 1.75;
  letter-spacing: 0.05em;
  color: var(--tb-copper);
  border-left: 2px solid var(--tb-gold);
  padding-left: 10px;
}

.page-faq .faq-answer__text {
  font-size: 0.9375rem;
  line-height: 1.88;
  color: var(--tb-graphite);
  max-width: 64ch;
}

.page-faq .faq-answer__text p {
  margin: 0;
}

.page-faq .faq-answer__text p + p {
  margin-top: 0.7em;
}

.page-faq .faq-link {
  color: var(--tb-copper);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-faq .faq-link:hover,
.page-faq .faq-link:focus-visible {
  color: var(--tb-copper-lit);
}

/* ── 编号结构图 ─────────────────────────── */
.page-faq .faq-code {
  margin: 22px 0 4px;
  padding: 16px;
  background: rgba(232, 225, 211, 0.7);
  border: 1px solid var(--faq-line);
  border-radius: 3px 26px 3px 3px;
}

.page-faq .faq-code svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-faq .faq-code figcaption {
  margin-top: 12px;
  padding-top: 11px;
  border-top: 1px dashed var(--faq-line);
  font-size: 0.8125rem;
  line-height: 1.75;
  color: var(--tb-graphite);
}

.page-faq .faq-media {
  margin: 24px 0 0;
}

.page-faq .faq-media img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 3px 30px 3px 3px;
  border: 1px solid var(--faq-line);
  object-fit: cover;
}

.page-faq .faq-media figcaption {
  margin-top: 9px;
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--tb-graphite);
}

/* ── 版本时间线 ─────────────────────────── */
.page-faq .faq-timeline {
  list-style: none;
  margin: 20px 0 4px;
  padding: 0 0 0 4px;
  border-left: 2px solid rgba(176, 141, 87, 0.6);
}

.page-faq .faq-timeline li {
  position: relative;
  padding: 0 0 18px 20px;
}

.page-faq .faq-timeline li:last-child {
  padding-bottom: 4px;
}

.page-faq .faq-timeline li::before {
  content: "";
  position: absolute;
  left: -8px;
  top: 0.45em;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--tb-paper);
  border: 2px solid var(--tb-copper);
}

.page-faq .faq-timeline__year {
  display: block;
  font-family: var(--tb-font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  color: var(--tb-gold);
}

.page-faq .faq-timeline__text {
  display: block;
  margin-top: 3px;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--tb-graphite);
  max-width: 58ch;
}

/* ── 表格补充 ───────────────────────────── */
.page-faq .tb-table {
  caption-side: top;
}

.page-faq .tb-table caption {
  padding: 6px 0 12px;
  text-align: left;
  font-family: var(--tb-font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  color: var(--tb-copper);
}

.page-faq .tb-table__wrap {
  margin-top: 22px;
}

/* ── 联系块 ─────────────────────────────── */
.page-faq .faq-contact {
  margin-top: 18px;
  padding: 22px 18px;
  background: var(--faq-tint);
  border: 1px solid var(--faq-line);
  border-radius: 3px 26px 3px 3px;
  display: grid;
  gap: 16px;
}

.page-faq .faq-contact__dl {
  display: grid;
  gap: 14px;
  margin: 0;
}

.page-faq .faq-contact__item dt {
  font-family: var(--tb-font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  color: var(--tb-copper);
}

.page-faq .faq-contact__item dd {
  margin: 4px 0 0;
  font-size: 0.9375rem;
  line-height: 1.65;
  color: var(--tb-ink);
  word-break: break-word;
}

.page-faq .faq-contact__note {
  margin: 0;
  padding-top: 14px;
  border-top: 1px dashed var(--faq-line);
  font-size: 0.875rem;
  line-height: 1.85;
  color: var(--tb-graphite);
  max-width: 62ch;
}

.page-faq .tb-actions {
  margin: 0;
}

/* ── 响应式 ─────────────────────────────── */
@media (min-width: 760px) {
  .page-faq .faq-hero {
    padding: 40px 0 54px;
  }

  .page-faq .faq-answer {
    grid-template-columns: 128px minmax(0, 1fr);
    gap: 22px;
    padding: 0 12px 24px;
  }

  .page-faq .faq-contact {
    padding: 26px 24px;
  }

  .page-faq .faq-contact__dl {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.9fr);
    gap: 48px;
    align-items: end;
  }

  .page-faq .faq-hero__figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-faq .faq-section--band {
    padding: 30px 28px 36px;
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-body {
    grid-template-columns: 236px minmax(0, 1fr);
    gap: 54px;
    align-items: start;
    padding: 52px 0 88px;
  }

  .page-faq .faq-toc {
    position: sticky;
    top: calc(var(--tb-mast-h) + 22px);
  }

  .page-faq .faq-toc__list {
    flex-direction: column;
    flex-wrap: nowrap;
  }

  .page-faq .faq-toc__link {
    width: 100%;
  }

  .page-faq .faq-item > summary {
    padding: 17px 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-answer {
    animation: none;
  }

  .page-faq .faq-toc__link,
  .page-faq .faq-item,
  .page-faq .faq-item__toggle {
    transition: none;
  }

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