.page-faq {
  --faq-block: clamp(46px, 7vw, 96px);
  --faq-line: rgba(185, 198, 187, 0.22);
  --faq-line-soft: rgba(185, 198, 187, 0.13);
  display: block;
  background: var(--paper);
  color: var(--ink);
  overflow-x: hidden;
}

/* ---------- 面包屑（置于深色首屏内） ---------- */
.page-faq .breadcrumbs {
  margin-bottom: 24px;
}

.page-faq .crumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.page-faq .crumb-item {
  color: var(--scale);
}

.page-faq .crumb-item + .crumb-item::before {
  content: "/";
  margin: 0 10px;
  color: var(--grid);
}

.page-faq .crumb-link {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--speed) ease, border-color var(--speed) ease;
}

.page-faq .crumb-link:hover,
.page-faq .crumb-link:focus-visible {
  color: var(--signal);
  border-bottom-color: var(--signal);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: var(--paper);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  top: -10%;
  right: -16%;
  width: min(640px, 80vw);
  aspect-ratio: 1 / 1;
  background-image:
    repeating-linear-gradient(90deg, rgba(58, 65, 72, 0.7) 0 1px, transparent 1px 56px),
    repeating-linear-gradient(0deg, rgba(58, 65, 72, 0.7) 0 1px, transparent 1px 56px);
  transform: rotate(-8deg);
  opacity: 0.55;
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--turf) 0 24%, var(--signal) 24% 28%, var(--lava) 28% 32%, transparent 32%);
  pointer-events: none;
}

.page-faq .faq-hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  padding-block: 34px 48px;
}

.page-faq .faq-hero-aside {
  border-top: 2px solid var(--lava);
  padding-top: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.75;
  color: var(--mist);
}

.page-faq .faq-hero-aside .index-label {
  display: block;
  margin-bottom: 12px;
  color: var(--signal);
}

.page-faq .faq-hero-stamp,
.page-faq .faq-hero-gap {
  margin: 0 0 6px;
}

.page-faq .faq-hero-gap {
  color: var(--lava);
  font-weight: 600;
}

.page-faq .faq-hero-gap .mono-num {
  font-size: 18px;
}

.page-faq .faq-hero-aside-note {
  margin: 14px 0 0;
  font-family: var(--font-body);
  font-size: 13.5px;
  line-height: 1.85;
  color: rgba(185, 198, 187, 0.86);
}

.page-faq .faq-title {
  margin: 0 0 20px;
  color: var(--paper);
}

.page-faq .faq-lede {
  max-width: 60ch;
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.95;
  color: var(--mist);
}

.page-faq .faq-jump {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  border-top: 1px solid var(--faq-line);
}

.page-faq .faq-jump li {
  border-bottom: 1px solid var(--faq-line-soft);
}

.page-faq .faq-jump a {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 12px 2px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--paper);
  text-decoration: none;
  transition: color var(--speed) ease, background-color var(--speed) ease;
}

.page-faq .faq-jump .mono-num {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: rgba(185, 198, 187, 0.66);
  transition: color var(--speed) ease;
}

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

.page-faq .faq-jump a:hover .mono-num,
.page-faq .faq-jump a:focus-visible .mono-num {
  color: var(--signal);
}

/* ---------- 通用区块 ---------- */
.page-faq .faq-section {
  position: relative;
  padding-block: var(--faq-block);
}

.page-faq .faq-head {
  margin-bottom: clamp(24px, 4vw, 44px);
}

.page-faq .faq-head .index-label {
  display: block;
  margin-bottom: 12px;
  color: var(--turf);
}

.page-faq .faq-head .section-title {
  margin: 0 0 14px;
  max-width: 26ch;
}

.page-faq .faq-note {
  max-width: 66ch;
  margin: 0;
  font-family: var(--font-body);
  font-size: 15.5px;
  line-height: 1.92;
  color: var(--scale);
}

/* ---------- 01 指标口径 ---------- */
.page-faq .faq-metrics {
  background: var(--paper);
}

.page-faq .faq-metrics::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--hairline-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--hairline-soft) 1px, transparent 1px);
  background-size: 96px 96px;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 58%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 58%);
  pointer-events: none;
}

.page-faq .faq-metrics > .shell {
  position: relative;
  z-index: 1;
}

.page-faq .faq-figure {
  margin: 0 0 clamp(28px, 4vw, 46px);
  background: var(--board);
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-faq .faq-figure .media-caption {
  padding: 12px 4px 14px;
  font-family: var(--font-body);
  font-size: 13px;
  line-height: 1.8;
  color: var(--scale);
}

.page-faq .faq-folds {
  border-top: 2px solid var(--grid);
}

.page-faq .faq-fold {
  border-bottom: 1px solid var(--hairline);
}

.page-faq .fold-summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  padding: 16px 4px;
  cursor: pointer;
  list-style: none;
  -webkit-tap-highlight-color: transparent;
  transition: background-color var(--speed) ease;
}

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

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

.page-faq .fold-summary:hover {
  background: rgba(228, 220, 200, 0.46);
}

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

.page-faq .fold-num {
  display: inline-grid;
  place-items: center;
  min-width: 32px;
  height: 26px;
  padding: 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--turf);
  border: 1px solid currentColor;
  transition: background-color var(--speed) ease, color var(--speed) ease, border-color var(--speed) ease;
}

.page-faq .faq-fold[open] .fold-num {
  background: var(--signal);
  border-color: var(--signal);
  color: var(--ink);
}

.page-faq .fold-text {
  display: block;
  min-width: 0;
}

.page-faq .fold-key {
  display: block;
  font-family: var(--font-head);
  font-size: clamp(16px, 2vw, 20px);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-faq .fold-hint {
  display: block;
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--scale);
}

.page-faq .fold-mark {
  position: relative;
  flex: none;
  width: 14px;
  height: 14px;
  color: var(--scale);
}

.page-faq .fold-mark::before,
.page-faq .fold-mark::after {
  content: "";
  position: absolute;
  background: currentColor;
  transition: transform var(--speed) ease, opacity var(--speed) ease;
}

.page-faq .fold-mark::before {
  left: 0;
  right: 0;
  top: 50%;
  height: 1px;
  transform: translateY(-50%);
}

.page-faq .fold-mark::after {
  top: 0;
  bottom: 0;
  left: 50%;
  width: 1px;
  transform: translateX(-50%);
}

.page-faq .faq-fold[open] .fold-mark::after {
  transform: translateX(-50%) scaleY(0);
  opacity: 0;
}

.page-faq .fold-body {
  padding: 2px 4px 26px 0;
  animation: faq-fold-in 180ms ease both;
}

@keyframes faq-fold-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

.page-faq .fold-side + .fold-side {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--hairline-soft);
}

.page-faq .fold-side-label {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--turf);
}

.page-faq .fold-side + .fold-side .fold-side-label {
  color: var(--lava);
}

.page-faq .fold-side p {
  margin: 0;
  font-family: var(--font-body);
  font-size: 15.5px;
  line-height: 1.92;
  color: var(--ink);
}

/* ---------- 02 更新节奏 ---------- */
.page-faq .faq-cadence {
  background: var(--board);
}

.page-faq .faq-cadence-track {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 2px solid var(--grid);
}

.page-faq .cadence-step {
  position: relative;
  padding: 22px 0 22px 24px;
  border-left: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline-soft);
}

.page-faq .cadence-step::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 30px;
  width: 8px;
  height: 8px;
  background: var(--turf);
}

.page-faq .cadence-tag {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--ink);
}

.page-faq .cadence-title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-faq .cadence-text {
  margin: 0;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.9;
  color: var(--ink);
}

.page-faq .faq-cadence-hold {
  margin-top: 34px;
  padding: 24px clamp(18px, 3vw, 34px) 26px;
  background: var(--ink);
  color: var(--paper);
  clip-path: polygon(0 0, calc(100% - 26px) 0, 100% 26px, 100% 100%, 26px 100%, 0 calc(100% - 26px));
}

.page-faq .faq-cadence-hold h3 {
  margin: 0 0 14px;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 800;
  color: var(--signal);
}

.page-faq .faq-hold-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-faq .faq-hold-list li {
  position: relative;
  padding-left: 20px;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.9;
  color: var(--mist);
}

.page-faq .faq-hold-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 10px;
  height: 1px;
  background: var(--lava);
}

/* ---------- 03 纠错与补充 ---------- */
.page-faq .faq-correction {
  background: var(--paper);
}

.page-faq .faq-correction-grid {
  display: grid;
  gap: clamp(30px, 4vw, 50px);
}

.page-faq .checklist-title {
  margin: 0 0 16px;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 800;
  color: var(--ink);
}

.page-faq .faq-progress {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
  margin-bottom: 18px;
}

.page-faq .faq-progress-seg {
  height: 4px;
  background: var(--hairline-soft);
  transition: background-color var(--speed) ease;
}

.page-faq .faq-checklist:has(#ck-shot:checked) .faq-progress-seg:nth-child(1),
.page-faq .faq-checklist:has(#ck-id:checked) .faq-progress-seg:nth-child(2),
.page-faq .faq-checklist:has(#ck-time:checked) .faq-progress-seg:nth-child(3) {
  background: var(--turf);
}

.page-faq .checklist-list {
  list-style: none;
  margin: 0 0 26px;
  padding: 0;
  border-top: 1px solid var(--hairline);
}

.page-faq .check-item {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 16px 4px;
  border-bottom: 1px solid var(--hairline);
  cursor: pointer;
}

.page-faq .check-item input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.page-faq .check-box {
  position: relative;
  width: 18px;
  height: 18px;
  margin-top: 3px;
  border: 1px solid var(--grid);
  background: transparent;
  transition: background-color var(--speed) ease, border-color var(--speed) ease;
}

.page-faq .check-box::after {
  content: "";
  position: absolute;
  left: 3px;
  right: 3px;
  top: 50%;
  height: 2px;
  background: var(--paper);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--speed) ease;
}

.page-faq .check-item input:checked + .check-box {
  background: var(--turf);
  border-color: var(--turf);
}

.page-faq .check-item input:checked + .check-box::after {
  transform: scaleX(1);
}

.page-faq .check-item input:focus-visible + .check-box {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

.page-faq .check-text {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.86;
  color: var(--ink);
  transition: color var(--speed) ease;
}

.page-faq .check-text strong {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 15px;
}

.page-faq .check-item input:checked ~ .check-text {
  color: var(--scale);
}

.page-faq .faq-correction-contact {
  padding: 20px 0 0;
  border-top: 2px solid var(--lava);
}

.page-faq .faq-correction-contact .index-label {
  display: block;
  margin-bottom: 8px;
  color: var(--lava);
}

.page-faq .faq-contact-line {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ink);
  word-break: break-word;
}

.page-faq .faq-contact-note {
  margin: 0;
  font-family: var(--font-body);
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--scale);
}

.page-faq .faq-figure-lane {
  background: var(--room);
  margin-bottom: 0;
}

.page-faq .faq-figure-lane .media-caption {
  color: var(--mist);
  background: var(--room);
}

/* ---------- 04 引用与转载 ---------- */
.page-faq .faq-cite {
  background: var(--room);
  color: var(--paper);
}

.page-faq .faq-cite .faq-head .index-label {
  color: var(--signal);
}

.page-faq .faq-cite .section-title {
  color: var(--paper);
}

.page-faq .faq-cite-grid {
  display: grid;
  gap: 20px;
}

.page-faq .cite-card {
  padding: 26px clamp(18px, 2.4vw, 30px) 28px;
  background: rgba(242, 239, 232, 0.05);
  border: 1px solid rgba(185, 198, 187, 0.2);
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 0 100%);
}

.page-faq .cite-card.is-commercial {
  background: rgba(226, 84, 43, 0.12);
  border-color: rgba(226, 84, 43, 0.46);
}

.page-faq .cite-tag {
  display: block;
  color: var(--signal);
}

.page-faq .cite-card h3 {
  margin: 10px 0 14px;
  font-family: var(--font-head);
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-faq .cite-card p {
  margin: 0 0 12px;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.9;
  color: var(--mist);
}

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

.page-faq .cite-card a {
  color: var(--focus);
  text-decoration: none;
  border-bottom: 1px solid rgba(143, 211, 168, 0.5);
  transition: border-color var(--speed) ease, color var(--speed) ease;
}

.page-faq .cite-card a:hover,
.page-faq .cite-card a:focus-visible {
  color: var(--signal);
  border-bottom-color: var(--signal);
}

.page-faq .faq-related {
  list-style: none;
  margin: 36px 0 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--faq-line);
  display: grid;
  gap: 12px;
}

.page-faq .faq-related a {
  display: block;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.05em;
  line-height: 1.7;
  color: var(--mist);
  text-decoration: none;
  transition: color var(--speed) ease;
}

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

/* ---------- 05 阅读与无障碍 ---------- */
.page-faq .faq-access {
  background: var(--paper);
  padding-bottom: clamp(56px, 8vw, 110px);
}

.page-faq .faq-access-grid {
  display: grid;
  gap: 22px;
}

.page-faq .access-card {
  padding-top: 20px;
  border-top: 2px solid var(--ink);
}

.page-faq .access-card:nth-child(2) {
  border-top-color: var(--turf);
}

.page-faq .access-card:nth-child(3) {
  border-top-color: var(--lava);
}

.page-faq .access-card h3 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 800;
  color: var(--ink);
}

.page-faq .access-card p {
  margin: 0;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.9;
  color: var(--ink);
}

/* ---------- 媒体查询 ---------- */
@media (min-width: 640px) {
  .page-faq .faq-lede {
    font-size: 17px;
  }

  .page-faq .faq-correction-grid {
    gap: 40px;
  }
}

@media (min-width: 860px) {
  .page-faq .faq-hero-inner {
    grid-template-columns: minmax(180px, 0.9fr) minmax(0, 3.4fr);
    gap: clamp(30px, 5vw, 76px);
    padding-block: 46px 88px;
  }

  .page-faq .faq-lede {
    font-size: 17.5px;
  }

  .page-faq .faq-jump {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 34px;
  }

  .page-faq .faq-jump li:nth-last-child(1):nth-child(odd) {
    grid-column: 1 / -1;
  }

  .page-faq .faq-figure img {
    clip-path: polygon(0 0, 100% 0, 100% calc(100% - 30px), calc(100% - 30px) 100%, 0 100%);
  }

  .page-faq .fold-body {
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: 0;
    padding-left: 46px;
    padding-bottom: 30px;
  }

  .page-faq .fold-side + .fold-side {
    margin-top: 0;
    padding-top: 0;
    border-top: 0;
    margin-left: 30px;
    padding-left: 30px;
    border-left: 1px solid var(--hairline);
  }

  .page-faq .faq-cadence-track {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 34px;
  }

  .page-faq .cadence-step {
    padding: 30px 0 0;
    border-left: 0;
    border-bottom: 0;
  }

  .page-faq .cadence-step::before {
    left: 0;
    top: -5px;
    width: 10px;
    height: 10px;
  }

  .page-faq .faq-cadence-hold {
    margin-top: 42px;
  }

  .page-faq .faq-correction-grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-cite-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 26px;
  }

  .page-faq .cite-card.is-commercial {
    margin-top: 22px;
  }

  .page-faq .faq-related {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-faq .faq-access-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 26px;
  }
}

@media (min-width: 1180px) {
  .page-faq .faq-hero-inner {
    grid-template-columns: minmax(200px, 0.82fr) minmax(0, 3.6fr);
  }

  .page-faq .fold-summary {
    padding: 20px 6px;
  }
}

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

  .page-faq .fold-mark::before,
  .page-faq .fold-mark::after,
  .page-faq .check-box,
  .page-faq .check-box::after,
  .page-faq .faq-progress-seg,
  .page-faq .faq-jump a {
    transition: none;
  }
}