.page-faq {
  --faq-shift: 20px;
  --faq-ink-wash: rgba(14, 42, 47, .05);
  background: var(--dc-paper);
  color: var(--dc-text);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  padding: calc(var(--dc-header-h) + clamp(26px, 5vw, 56px)) 0 clamp(38px, 6vw, 72px);
  background: linear-gradient(180deg, #EEE8DC 0%, var(--dc-paper) 78%);
  border-bottom: 2px solid var(--dc-copper);
}

.page-faq .faq-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  margin-top: clamp(20px, 3vw, 34px);
}

.page-faq .faq-hero__title {
  margin: 10px 0 0;
  font-family: var(--dc-serif);
  font-weight: 900;
  font-size: clamp(36px, 6.6vw, 80px);
  line-height: 1.04;
  letter-spacing: .01em;
  color: var(--dc-ink);
}

.page-faq .faq-hero__lede {
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  max-width: 62ch;
  color: var(--dc-blue);
}

.page-faq .faq-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--dc-line);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--dc-copper);
}

.page-faq .faq-hero__index {
  background: var(--dc-ink);
  color: var(--dc-warm);
  padding: 22px 20px 18px;
  border-top: 3px solid var(--dc-amber);
}

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

.page-faq .faq-jump li:last-child a {
  border-bottom: 0;
}

.page-faq .faq-jump a {
  display: flex;
  gap: 14px;
  align-items: baseline;
  padding: 12px 0;
  border-bottom: 1px solid rgba(201, 214, 211, .2);
  color: var(--dc-warm);
  text-decoration: none;
  font-size: 15px;
  transition: color .16s ease, padding-left .16s ease;
}

.page-faq .faq-jump a:hover,
.page-faq .faq-jump a:focus-visible {
  color: var(--dc-amber);
  padding-left: 4px;
}

.page-faq .faq-jump .dc-mono {
  font-size: 12px;
  color: var(--dc-copper);
}

/* ---------- 章节骨架 ---------- */
.page-faq .faq-sec {
  padding: clamp(42px, 6.6vw, 86px) 0;
}

.page-faq .faq-sec + .faq-sec,
.page-faq .faq-sec--questions {
  border-top: 1px solid var(--dc-line);
}

.page-faq .faq-sec__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 14px 20px;
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-faq .faq-sec__lede {
  max-width: 64ch;
  margin: 0 0 clamp(24px, 3.4vw, 38px);
  color: var(--dc-blue);
}

/* ---------- 01 适配清单 ---------- */
.page-faq .faq-adapt {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
}

.page-faq .faq-adapt__intro {
  margin: 0 0 24px;
  max-width: 66ch;
  color: var(--dc-blue);
}

.page-faq .faq-adapt__side-note {
  margin-top: 22px;
  padding: 18px 0 0;
  border-top: 1px solid var(--dc-line);
  font-size: 15px;
  line-height: 1.8;
  color: var(--dc-blue);
}

.page-faq .faq-adapt__side-label {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--dc-copper);
}

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

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1000 / 650;
  object-fit: cover;
  border: 1px solid var(--dc-line);
}

.page-faq .faq-figure figcaption {
  margin-top: 10px;
  padding-top: 8px;
  border-top: 1px solid var(--dc-line);
  font-family: var(--dc-mono);
  font-size: 12px;
  letter-spacing: .06em;
  line-height: 1.6;
  color: var(--dc-blue);
}

/* 筛选条 */
.page-faq .faq-sheet {
  position: relative;
}

.page-faq .faq-sheet__radio {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  border: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.page-faq .faq-sheet__filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.page-faq .faq-sheet__filters label {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 14px;
  border: 1px solid var(--dc-line);
  font-size: 14px;
  color: var(--dc-blue);
  cursor: pointer;
  transition: background-color .16s ease, color .16s ease, border-color .16s ease;
}

.page-faq .faq-sheet__filters label .dc-mono {
  font-size: 12px;
  letter-spacing: .04em;
}

.page-faq .faq-sheet__filters label:hover {
  border-color: var(--dc-copper);
  color: var(--dc-copper);
}

.page-faq #faq-tier-all:checked ~ .faq-sheet__filters label[for="faq-tier-all"],
.page-faq #faq-tier-a:checked ~ .faq-sheet__filters label[for="faq-tier-a"],
.page-faq #faq-tier-b:checked ~ .faq-sheet__filters label[for="faq-tier-b"],
.page-faq #faq-tier-c:checked ~ .faq-sheet__filters label[for="faq-tier-c"] {
  background: var(--dc-ink);
  border-color: var(--dc-ink);
  color: var(--dc-warm);
}

.page-faq #faq-tier-all:checked ~ .faq-sheet__filters label[for="faq-tier-all"] .dc-mono,
.page-faq #faq-tier-a:checked ~ .faq-sheet__filters label[for="faq-tier-a"] .dc-mono,
.page-faq #faq-tier-b:checked ~ .faq-sheet__filters label[for="faq-tier-b"] .dc-mono,
.page-faq #faq-tier-c:checked ~ .faq-sheet__filters label[for="faq-tier-c"] .dc-mono {
  color: var(--dc-amber);
}

.page-faq .faq-sheet__radio:focus-visible ~ .faq-sheet__filters label[for="faq-tier-all"],
.page-faq .faq-sheet__radio:focus-visible ~ .faq-sheet__filters label[for="faq-tier-a"],
.page-faq .faq-sheet__radio:focus-visible ~ .faq-sheet__filters label[for="faq-tier-b"],
.page-faq .faq-sheet__radio:focus-visible ~ .faq-sheet__filters label[for="faq-tier-c"] {
  outline: 2px solid var(--dc-amber);
  outline-offset: 2px;
}

.page-faq #faq-tier-a:checked ~ .faq-sheet__scroll tbody tr:not(.tier-a),
.page-faq #faq-tier-b:checked ~ .faq-sheet__scroll tbody tr:not(.tier-b),
.page-faq #faq-tier-c:checked ~ .faq-sheet__scroll tbody tr:not(.tier-c) {
  display: none;
}

.page-faq #faq-tier-a:checked ~ .faq-sheet__scroll tbody tr.tier-a,
.page-faq #faq-tier-b:checked ~ .faq-sheet__scroll tbody tr.tier-b,
.page-faq #faq-tier-c:checked ~ .faq-sheet__scroll tbody tr.tier-c {
  background: var(--dc-card);
}

/* 表格 */
.page-faq .faq-sheet__scroll {
  overflow-x: auto;
  border-top: 2px solid var(--dc-ink);
}

.page-faq .faq-table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
  font-size: 15px;
  background: transparent;
}

.page-faq .faq-table thead th {
  background: var(--dc-ink);
  color: var(--dc-warm);
  font-family: var(--dc-mono);
  font-weight: 500;
  font-size: 12px;
  letter-spacing: .14em;
  text-align: left;
  padding: 13px 14px;
  border-bottom: 2px solid var(--dc-copper);
  white-space: nowrap;
}

.page-faq .faq-table tbody th,
.page-faq .faq-table tbody td,
.page-faq .faq-table tfoot th,
.page-faq .faq-table tfoot td {
  padding: 16px 14px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--dc-line);
  line-height: 1.65;
}

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

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

.page-faq .faq-table__num {
  font-family: var(--dc-mono);
  color: var(--dc-text);
  white-space: nowrap;
}

.page-faq .faq-table tfoot th,
.page-faq .faq-table tfoot td {
  background: var(--faq-ink-wash);
  border-bottom: 0;
  border-top: 1px solid var(--dc-blue);
  font-size: 14px;
}

.page-faq .faq-table tfoot th {
  font-family: var(--dc-mono);
  font-weight: 500;
  color: var(--dc-ink);
}

/* 反馈提示带 */
.page-faq .faq-note-band {
  margin-top: clamp(26px, 3.4vw, 38px);
  padding: 22px 24px;
  background: var(--dc-card);
  border-left: 3px solid var(--dc-copper);
}

.page-faq .faq-note-band__title {
  margin: 0 0 12px;
  font-family: var(--dc-serif);
  font-weight: 900;
  font-size: 19px;
  color: var(--dc-ink);
}

.page-faq .faq-note-band__list {
  margin: 0;
  padding: 0 0 0 18px;
  color: var(--dc-blue);
  font-size: 15.5px;
  line-height: 1.85;
}

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

/* ---------- 02 反馈四项 ---------- */
.page-faq .faq-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-faq .faq-steps__item {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 0 14px;
  padding: 20px 0 22px;
  border-top: 1px solid var(--dc-line);
}

.page-faq .faq-steps__item:last-child {
  border-bottom: 1px solid var(--dc-line);
}

.page-faq .faq-steps__num {
  grid-row: 1 / span 2;
  font-size: 13px;
  color: var(--dc-copper);
  padding-top: 5px;
}

.page-faq .faq-steps__title {
  grid-column: 2;
  margin: 0 0 6px;
  font-family: var(--dc-serif);
  font-weight: 900;
  font-size: 20px;
  line-height: 1.4;
  color: var(--dc-ink);
}

.page-faq .faq-steps__item p {
  grid-column: 2;
  margin: 0;
  color: var(--dc-blue);
  font-size: 15.5px;
  line-height: 1.8;
}

.page-faq .faq-process {
  margin-top: clamp(26px, 3.4vw, 38px);
  padding-top: 22px;
  border-top: 1px solid var(--dc-line);
  display: grid;
  gap: 18px;
}

.page-faq .faq-process__text {
  margin: 0;
  color: var(--dc-blue);
  font-size: 15.5px;
  line-height: 1.85;
}

.page-faq .faq-process__tag {
  display: inline-block;
  margin-right: 10px;
  padding: 3px 8px;
  background: var(--dc-amber);
  color: var(--dc-ink-deep);
  font-size: 11px;
  letter-spacing: .14em;
  vertical-align: 2px;
}

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

/* ---------- 03 文档 ---------- */
.page-faq .faq-sec--docs {
  background: linear-gradient(180deg, var(--dc-paper) 0%, #EFE9DE 100%);
}

.page-faq .faq-docs__top {
  display: grid;
  gap: clamp(24px, 4vw, 42px);
  margin-bottom: clamp(30px, 4.6vw, 54px);
}

.page-faq .faq-docs__intro p {
  margin: 0 0 16px;
  color: var(--dc-blue);
  font-size: 15.5px;
  line-height: 1.85;
}

.page-faq .faq-docs__hint {
  padding-left: 14px;
  border-left: 2px solid var(--dc-amber);
  font-size: 14.5px;
}

.page-faq .faq-docs__hint .dc-mono {
  margin-right: 8px;
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--dc-copper);
}

.page-faq .faq-docs__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-faq .faq-doc {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-height: 172px;
  padding: 16px 16px 18px;
  background: var(--dc-card);
  border: 1px solid var(--dc-line);
  border-left: 2px solid var(--dc-line);
  transition: border-left-color .14s ease, transform .14s ease;
}

.page-faq .faq-doc:hover {
  border-left-color: var(--dc-copper);
  transform: translateY(-2px);
}

.page-faq .faq-doc__no {
  margin: 0;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--dc-copper);
}

.page-faq .faq-doc__title {
  flex: 1 1 auto;
  margin: 0;
  font-family: var(--dc-serif);
  font-weight: 900;
  font-size: 17px;
  line-height: 1.45;
  color: var(--dc-ink);
}

.page-faq .faq-doc__series {
  margin: 0;
  font-size: 13px;
  color: var(--dc-slate);
}

.page-faq .faq-doc__fmt {
  margin: 0;
  padding-top: 8px;
  border-top: 1px solid var(--dc-line);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--dc-blue);
}

.page-faq .faq-docs__foot {
  margin: clamp(24px, 3.4vw, 36px) 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--dc-line);
  color: var(--dc-blue);
  font-size: 15px;
  line-height: 1.8;
}

/* ---------- 04 问答 ---------- */
.page-faq .faq-qs {
  max-width: 900px;
}

.page-faq .faq-q {
  border-top: 1px solid var(--dc-line);
}

.page-faq .faq-q:last-child {
  border-bottom: 1px solid var(--dc-line);
}

.page-faq .faq-q summary {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 18px;
  padding: clamp(20px, 2.6vw, 26px) 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--dc-serif);
  font-weight: 900;
  font-size: clamp(17px, 1.7vw, 21px);
  line-height: 1.5;
  color: var(--dc-ink);
  transition: color .16s ease;
}

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

.page-faq .faq-q summary::after {
  content: "+";
  flex: none;
  font-family: var(--dc-mono);
  font-size: 20px;
  color: var(--dc-copper);
}

.page-faq .faq-q[open] summary::after {
  content: "−";
}

.page-faq .faq-q summary:hover,
.page-faq .faq-q[open] summary {
  color: var(--dc-copper-dark);
}

.page-faq .faq-q__body {
  max-width: 68ch;
  padding: 0 0 clamp(22px, 3vw, 30px);
  color: var(--dc-blue);
  font-size: 15.5px;
  line-height: 1.85;
}

.page-faq .faq-q__body p {
  margin: 0 0 12px;
}

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

/* ---------- 05 使用指南 ---------- */
.page-faq .faq-guide {
  display: grid;
  gap: 20px;
  padding: clamp(22px, 3vw, 34px);
  background: var(--dc-card);
  border-left: 3px solid var(--dc-copper);
}

.page-faq .faq-guide__text p {
  margin: 0 0 14px;
  color: var(--dc-blue);
  font-size: 15.5px;
  line-height: 1.85;
}

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

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

/* ---------- 06 联系 ---------- */
.page-faq .faq-contact {
  padding: clamp(40px, 6vw, 78px) 0 clamp(34px, 5vw, 60px);
  background: var(--dc-ink);
  color: var(--dc-warm);
  border-top: 2px solid var(--dc-copper);
}

.page-faq .faq-contact__grid {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
}

.page-faq .faq-contact__num {
  color: var(--dc-amber);
}

.page-faq .faq-contact__title {
  color: var(--dc-warm);
  margin-top: 8px;
}

.page-faq .faq-contact__text {
  margin: 16px 0 0;
  max-width: 56ch;
  color: rgba(244, 239, 230, .86);
  font-size: 15.5px;
  line-height: 1.85;
}

.page-faq .faq-contact__list {
  margin: 0;
  border-top: 1px solid rgba(201, 214, 211, .24);
}

.page-faq .faq-contact__row {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  gap: 12px;
  padding: 14px 0;
  border-bottom: 1px solid rgba(201, 214, 211, .24);
}

.page-faq .faq-contact__row dt {
  font-family: var(--dc-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--dc-amber);
  padding-top: 3px;
}

.page-faq .faq-contact__row dd {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.6;
  color: var(--dc-warm);
  word-break: break-word;
}

.page-faq .faq-contact__row dd a {
  color: var(--dc-warm);
  text-decoration: none;
  border-bottom: 1px solid var(--dc-copper);
  transition: color .16s ease, border-color .16s ease;
}

.page-faq .faq-contact__row dd a:hover {
  color: var(--dc-amber);
  border-bottom-color: var(--dc-amber);
}

.page-faq .faq-contact__more {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 28px;
  margin: clamp(26px, 3.4vw, 38px) 0 0;
  padding-top: 20px;
  border-top: 1px solid rgba(201, 214, 211, .24);
}

.page-faq .faq-contact__more .dc-link {
  color: var(--dc-warm);
  border-bottom: 1px solid var(--dc-copper);
}

.page-faq .faq-contact__more .dc-link:hover {
  color: var(--dc-amber);
  border-bottom-color: var(--dc-amber);
}

/* ---------- 媒体查询 ---------- */
@media (min-width: 620px) {
  .page-faq .faq-docs__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

  .page-faq .faq-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(22px, 3.4vw, 48px);
  }

  .page-faq .faq-steps__item:last-child {
    border-bottom: 0;
  }
}

@media (min-width: 760px) {
  .page-faq .faq-sheet__scroll {
    overflow: visible;
  }

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

  .page-faq .faq-table thead th {
    position: sticky;
    top: var(--dc-header-h);
    z-index: 2;
  }

  .page-faq .faq-process {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: clamp(20px, 3vw, 40px);
  }

  .page-faq .faq-guide {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: clamp(22px, 3.4vw, 44px);
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1fr) 322px;
    align-items: start;
    gap: clamp(34px, 5vw, 76px);
  }

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

  .page-faq .faq-docs__top {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
    align-items: start;
  }

  .page-faq .faq-contact__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 1020px) {
  .page-faq .faq-docs__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
    padding-bottom: calc(var(--faq-shift) * 2 + 10px);
  }

  .page-faq .faq-doc:nth-child(4n+2) {
    margin-top: var(--faq-shift);
  }

  .page-faq .faq-doc:nth-child(4n+3) {
    margin-top: calc(var(--faq-shift) * 2);
  }

  .page-faq .faq-doc:nth-child(4n+4) {
    margin-top: var(--faq-shift);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-doc,
  .page-faq .faq-jump a,
  .page-faq .faq-q summary,
  .page-faq .faq-sheet__filters label {
    transition: none;
  }

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

  .page-faq .faq-jump a:hover {
    padding-left: 0;
  }
}