.page-faq {
  --faq-rail: 92px;
  --faq-gap: clamp(20px, 4vw, 56px);
  --faq-answer: 62ch;
  background: var(--ink);
  color: var(--paper);
}

/* ---------- 面包屑 ---------- */
.page-faq .faq-crumbs {
  padding-top: clamp(18px, 3vw, 30px);
  padding-bottom: 6px;
}

.page-faq .crumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  color: var(--mist);
}

.page-faq .crumb-list li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}

.page-faq .crumb-list a {
  color: var(--mist);
  text-decoration: none;
  transition: color 140ms linear;
}

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

.page-faq .crumb-list [aria-current="page"] {
  color: var(--paper);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(34px, 7vw, 86px) 0 clamp(28px, 5vw, 62px);
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  right: 6%;
  width: clamp(52px, 13vw, 180px);
  background: linear-gradient(90deg, rgba(224, 138, 46, 0) 0%, rgba(224, 138, 46, 0.14) 48%, rgba(242, 192, 91, 0.05) 100%);
  pointer-events: none;
}

.page-faq .faq-hero-inner {
  position: relative;
  display: grid;
  gap: clamp(26px, 4vw, 40px);
  align-items: end;
}

.page-faq .faq-hero-copy h1 {
  margin: 14px 0 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 6.4vw, 62px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--paper);
  max-width: 16ch;
}

.page-faq .faq-hero-copy .lead {
  max-width: var(--faq-answer);
  margin: 0;
  color: var(--mist);
}

.page-faq .faq-hero-meter {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-left: 18px;
  border-left: 1px solid var(--line);
}

.page-faq .faq-hero-num {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-variant-numeric: tabular-nums;
  font-size: clamp(58px, 14vw, 132px);
  line-height: 0.86;
  letter-spacing: -0.03em;
  color: var(--gold);
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 420ms ease, transform 420ms ease;
}

.page-faq .faq-hero-num.is-visible {
  opacity: 1;
  transform: none;
}

.page-faq .faq-hero-label {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--mist);
  max-width: 12ch;
  line-height: 1.7;
}

/* ---------- 门牌条 ---------- */
.page-faq .faq-plates {
  position: sticky;
  top: var(--header-h);
  z-index: 20;
  background: rgba(11, 14, 18, 0.94);
  border-bottom: 1px solid var(--line-soft);
  backdrop-filter: blur(6px);
}

.page-faq .faq-plates-inner {
  display: flex;
  align-items: stretch;
  gap: 8px;
  padding-top: 10px;
  padding-bottom: 10px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-faq .faq-plate {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  padding: 9px 15px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--paper);
  text-decoration: none;
  transition: border-color 140ms linear, background-color 140ms linear;
}

.page-faq .faq-plate:hover,
.page-faq .faq-plate:focus-visible {
  border-color: var(--gold);
  background: rgba(224, 138, 46, 0.08);
}

.page-faq .faq-plate-num {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-faq .faq-plate-text {
  font-size: 14px;
  font-weight: 700;
  white-space: nowrap;
}

/* ---------- 分类索引 ---------- */
.page-faq .faq-index {
  padding-top: clamp(38px, 6vw, 76px);
}

.page-faq .faq-index-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: clamp(24px, 4vw, 40px);
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-faq .faq-index-cell {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 24px 20px 22px;
  background: var(--slate);
  transition: background-color 160ms linear;
}

.page-faq .faq-index-cell:hover {
  background: var(--night);
}

.page-faq .faq-index-num {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.page-faq .faq-index-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 19px;
  line-height: 1.4;
  color: var(--paper);
}

.page-faq .faq-index-count {
  margin: 0;
  font-size: 13px;
  color: var(--mist);
}

.page-faq .faq-index-count .mono {
  color: var(--amber);
  font-size: 15px;
}

.page-faq .faq-index-list {
  margin: 6px 0 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.page-faq .faq-index-list li {
  position: relative;
  padding-left: 13px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--mist);
}

.page-faq .faq-index-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 1px;
  background: var(--teal);
}

.page-faq .faq-index-link {
  margin-top: auto;
  padding-top: 12px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--gold);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  align-self: flex-start;
  transition: color 140ms linear, border-color 140ms linear;
}

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

.page-faq .faq-index-media {
  margin: clamp(24px, 4vw, 44px) 0 0;
  border: 1px solid var(--line-soft);
}

/* ---------- 答疑分组 ---------- */
.page-faq .faq-group {
  padding: clamp(40px, 6vw, 84px) 0;
  border-top: 1px solid var(--line-soft);
  scroll-margin-top: calc(var(--header-h) + 70px);
}

.page-faq .faq-group--access {
  background: var(--night);
}

.page-faq .faq-group-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 32px);
}

.page-faq .faq-group-rail {
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.page-faq .faq-group-num {
  font-family: var(--font-display);
  font-weight: 900;
  font-variant-numeric: tabular-nums;
  font-size: clamp(38px, 9vw, 78px);
  line-height: 0.84;
  letter-spacing: -0.03em;
  color: var(--mist);
  transition: color 420ms ease;
}

.page-faq .faq-group-num.is-visible {
  color: var(--gold);
}

.page-faq .faq-group-rail .vertical-label {
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--mist);
  white-space: nowrap;
}

.page-faq .faq-group-body {
  min-width: 0;
}

.page-faq .faq-group-head {
  padding-bottom: clamp(18px, 3vw, 28px);
}

.page-faq .faq-group-head h2 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 3.4vw, 34px);
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--paper);
  max-width: 22ch;
}

.page-faq .faq-group-head p {
  margin: 0;
  max-width: var(--faq-answer);
  font-size: 15px;
  line-height: 1.8;
}

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

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

.page-faq .faq-item > summary {
  position: relative;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding: 19px 0 19px 18px;
  cursor: pointer;
  list-style: none;
  transition: background-color 140ms linear;
}

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

.page-faq .faq-item > summary::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  bottom: 14px;
  width: 2px;
  background: transparent;
  transition: background-color 160ms linear;
}

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

.page-faq .faq-item > summary:hover {
  background: rgba(224, 138, 46, 0.05);
}

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

.page-faq .faq-q {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(16px, 2.3vw, 21px);
  line-height: 1.5;
  letter-spacing: -0.01em;
  color: var(--paper);
  transition: color 160ms linear;
}

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

.page-faq .faq-mark {
  position: relative;
  flex: 0 0 auto;
  width: 15px;
  height: 15px;
  margin-top: 7px;
}

.page-faq .faq-mark::before,
.page-faq .faq-mark::after {
  content: "";
  position: absolute;
  background: var(--gold);
  transition: transform 180ms ease, background-color 160ms linear;
}

.page-faq .faq-mark::before {
  left: 0;
  top: 6px;
  width: 15px;
  height: 2px;
}

.page-faq .faq-mark::after {
  left: 6px;
  top: 0;
  width: 2px;
  height: 15px;
}

.page-faq .faq-item[open] .faq-mark::after {
  transform: scaleY(0);
}

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

.page-faq .faq-a {
  padding: 0 0 22px 18px;
}

.page-faq .faq-a p {
  margin: 0;
  max-width: var(--faq-answer);
  font-size: 15px;
  line-height: 1.9;
  color: var(--mist);
}

.page-faq .faq-device-media {
  margin: clamp(26px, 4vw, 40px) 0 0;
  border: 1px solid var(--line-soft);
  background: var(--ink);
}

/* ---------- 收束联系 ---------- */
.page-faq .faq-help {
  padding-top: clamp(40px, 6vw, 80px);
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-faq .faq-help-panel {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 48px);
  padding: clamp(24px, 4vw, 46px);
  background: var(--note);
  color: var(--ink-text);
  border-left: 3px solid var(--gold);
}

.page-faq .faq-help-copy h2 {
  margin: 12px 0 12px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 3.6vw, 34px);
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--ink-text);
}

.page-faq .faq-help-copy .eyebrow {
  color: var(--copper);
}

.page-faq .faq-help-copy p {
  margin: 0 0 16px;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-text);
}

.page-faq .faq-help-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.page-faq .faq-help-list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-text);
}

.page-faq .faq-help-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 9px;
  height: 2px;
  background: var(--copper);
}

.page-faq .faq-help-contact {
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding-top: 4px;
}

.page-faq .faq-contact-list {
  margin: 0;
  display: grid;
  gap: 4px;
}

.page-faq .faq-contact-list dt {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--copper);
}

.page-faq .faq-contact-list dd {
  margin: 0 0 12px;
  font-size: 16px;
  line-height: 1.7;
  font-weight: 700;
  color: var(--ink-text);
  word-break: break-word;
}

.page-faq .faq-contact-list dd:last-child {
  margin-bottom: 0;
}

.page-faq .faq-help-btn {
  align-self: flex-start;
}

@media (max-width: 560px) {
  .page-faq .faq-contact-list dd .mono {
    font-size: 15px;
  }
}

/* ---------- 中等屏 ---------- */
@media (min-width: 720px) {
  .page-faq .faq-index-grid {
    grid-template-columns: 1fr 1fr;
  }

  .page-faq .faq-hero-inner {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
  }

  .page-faq .faq-hero-meter {
    padding-left: 26px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-faq .faq-group-inner {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
    gap: var(--faq-gap);
  }

  .page-faq .faq-group-rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 18px;
    padding-top: 4px;
  }

  .page-faq .faq-group-rail .vertical-label {
    writing-mode: vertical-rl;
    letter-spacing: 0.3em;
    line-height: 1;
    margin-top: 4px;
  }

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

  .page-faq .faq-item > summary {
    padding: 22px 0 22px 20px;
  }

  .page-faq .faq-a {
    padding-left: 20px;
  }
}

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

  .page-faq .faq-index-cell {
    padding: 30px 24px 26px;
  }

  .page-faq .faq-index-cell:nth-child(2) {
    transform: translateY(18px);
  }

  .page-faq .faq-index-cell:nth-child(4) {
    transform: translateY(18px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-hero-num,
  .page-faq .faq-group-num,
  .page-faq .faq-mark::before,
  .page-faq .faq-mark::after,
  .page-faq .faq-item > summary::before {
    transition: none;
  }

  .page-faq .faq-hero-num {
    opacity: 1;
    transform: none;
  }
}