.page-faq {
  --faq-sticky-top: 96px;
  background: var(--ink);
  color: var(--white);
  padding-bottom: clamp(56px, 9vw, 112px);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(36px, 6vw, 84px) 0 clamp(30px, 5vw, 60px);
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(118deg, rgba(255, 90, 31, 0.16) 0%, rgba(255, 90, 31, 0) 46%),
    linear-gradient(180deg, var(--ink-deep) 0%, var(--ink) 100%);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(42, 58, 68, 0.6) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(42, 58, 68, 0.6) 1px, transparent 1px);
  background-size: 96px 96px;
  opacity: 0.45;
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  right: -140px;
  bottom: -190px;
  width: 420px;
  height: 420px;
  transform: rotate(18deg);
  background: linear-gradient(135deg, rgba(255, 90, 31, 0.32), rgba(255, 90, 31, 0) 72%);
  pointer-events: none;
}

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

.page-faq .breadcrumb {
  margin-bottom: clamp(24px, 4vw, 48px);
}

.page-faq .faq-hero__title {
  margin: 14px 0 0;
  max-width: 18ch;
  font-size: clamp(34px, 6.2vw, 78px);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-faq .faq-hero__title::after {
  content: "";
  display: block;
  width: clamp(72px, 14vw, 180px);
  height: 6px;
  margin-top: clamp(16px, 2.6vw, 28px);
  background: var(--orange);
}

.page-faq .faq-hero__lede {
  max-width: 62ch;
  margin-top: clamp(18px, 3vw, 32px);
  color: var(--white);
  opacity: 0.86;
}

.page-faq .faq-hero__stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: clamp(28px, 4.5vw, 52px);
  background: var(--line);
  border: 1px solid var(--line);
}

.page-faq .faq-hero__stats .stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 20px;
  background: var(--green);
}

.page-faq .faq-hero__stats .stat__value {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 40px);
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-faq .faq-hero__stats .stat__value small {
  margin-left: 4px;
  font-size: 0.42em;
  letter-spacing: 0.08em;
  color: var(--gray);
}

.page-faq .faq-hero__stats .stat__label {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gray);
}

/* ---------- 主体两栏 ---------- */
.page-faq .faq-body {
  padding-top: clamp(36px, 6vw, 72px);
}

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 48px);
}

.page-faq .faq-index__label {
  margin-bottom: 12px;
  color: var(--gray);
}

.page-faq .faq-index__nav {
  display: flex;
  gap: 0;
  overflow-x: auto;
  border-bottom: 1px solid var(--line);
  padding-bottom: 2px;
  scrollbar-width: thin;
}

.page-faq .faq-index__item {
  display: block;
  flex: 0 0 auto;
  padding: 10px 16px 10px 14px;
  border-left: 1px solid var(--line);
  color: var(--gray);
  font-size: 14px;
  line-height: 1.5;
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-faq .faq-index__item:hover,
.page-faq .faq-index__item:focus-visible {
  color: var(--white);
  border-left-color: var(--orange);
}

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

.page-faq .faq-index__anno {
  display: none;
  margin-top: 18px;
}

/* ---------- 分组 ---------- */
.page-faq .faq-group {
  scroll-margin-top: var(--faq-sticky-top);
  padding-bottom: clamp(40px, 6vw, 72px);
  margin-bottom: clamp(40px, 6vw, 72px);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-group--last,
.page-faq .faq-group:last-child {
  margin-bottom: 0;
  border-bottom: 0;
  padding-bottom: 0;
}

.page-faq .faq-group__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 16px;
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-faq .faq-group__num {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-faq .faq-group__title {
  margin: 0;
  font-size: clamp(24px, 3.6vw, 40px);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-faq .faq-group__note {
  flex: 1 0 100%;
  margin: 0;
  max-width: 56ch;
  font-size: 14px;
  line-height: 1.7;
  color: var(--gray);
}

/* ---------- 图片 ---------- */
.page-faq .faq-figure {
  margin: 0 0 clamp(22px, 3.4vw, 34px);
  border: 1px solid var(--line);
  background: var(--green);
}

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

.page-faq .faq-figure .media__caption {
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--gray);
}

.page-faq .faq-figure--mid {
  margin: clamp(30px, 5vw, 56px) 0;
}

/* ---------- 三步流程 ---------- */
.page-faq .steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-faq .step {
  position: relative;
  padding: 24px 20px 26px;
  background: var(--ink);
}

.page-faq .step::after {
  content: "";
  position: absolute;
  right: -1px;
  bottom: -1px;
  width: 22px;
  height: 22px;
  background: linear-gradient(135deg, transparent 50%, var(--orange-deep) 50%);
  opacity: 0.85;
}

.page-faq .step__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(34px, 5vw, 52px);
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-faq .step__title {
  margin: 14px 0 8px;
  font-size: 18px;
  font-weight: 800;
  color: var(--white);
}

.page-faq .step__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--gray);
}

.page-faq .step__text a {
  color: var(--ice);
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

/* ---------- 问答手风琴 ---------- */
.page-faq .qa-list {
  border-top: 1px solid var(--line);
}

.page-faq .qa-list--after {
  margin-top: clamp(24px, 4vw, 40px);
}

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

.page-faq .qa summary {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px 4px 18px 0;
  cursor: pointer;
  list-style: none;
  transition: color var(--t-fast) var(--ease);
}

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

.page-faq .qa summary::after {
  content: "";
  flex: 0 0 auto;
  width: 16px;
  height: 16px;
  border: 1px solid var(--line);
  transition: background var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-faq .qa summary:hover::after,
.page-faq .qa summary:focus-visible::after {
  border-color: var(--orange);
}

.page-faq .qa[open] summary::after {
  background: var(--orange);
  border-color: var(--orange);
}

.page-faq .qa summary:focus-visible {
  outline: 2px solid var(--yellow);
  outline-offset: 3px;
}

.page-faq .qa__q {
  flex: 1;
  margin: 0;
  font-size: 17px;
  font-weight: 800;
  line-height: 1.5;
  letter-spacing: -0.01em;
  color: var(--white);
}

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

.page-faq .qa__a {
  padding: 0 40px 22px 0;
  border-left: 2px solid var(--orange);
  padding-left: 18px;
  margin-left: 0;
}

.page-faq .qa__a p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--gray);
}

.page-faq .qa__a a {
  color: var(--ice);
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

.page-faq mark {
  background: var(--yellow);
  color: var(--ink);
  padding: 0 3px;
}

/* ---------- 导出格式切换 ---------- */
.page-faq .fmt {
  border: 1px solid var(--line);
  background: var(--green);
}

.page-faq .fmt__tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 1px;
  border-bottom: 1px solid var(--line);
}

.page-faq .fmt__tab {
  flex: 1 1 auto;
  padding: 12px 22px;
  text-align: center;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--gray);
  border-right: 1px solid var(--line);
  transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}

.page-faq .fmt__tab:last-child {
  border-right: 0;
}

.page-faq .fmt__tab:hover {
  color: var(--white);
}

.page-faq .fmt__pane {
  display: none;
  padding: 22px 22px 26px;
}

.page-faq .fmt__pane-title {
  margin: 0 0 10px;
  font-size: 16px;
  font-weight: 800;
  color: var(--white);
}

.page-faq .fmt__pane p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--gray);
}

.page-faq #fmt-csv:checked ~ .fmt__tabs label[for="fmt-csv"],
.page-faq #fmt-xlsx:checked ~ .fmt__tabs label[for="fmt-xlsx"],
.page-faq #fmt-png:checked ~ .fmt__tabs label[for="fmt-png"] {
  background: var(--orange);
  color: var(--ink);
}

.page-faq #fmt-csv:focus-visible ~ .fmt__tabs label[for="fmt-csv"],
.page-faq #fmt-xlsx:focus-visible ~ .fmt__tabs label[for="fmt-xlsx"],
.page-faq #fmt-png:focus-visible ~ .fmt__tabs label[for="fmt-png"] {
  outline: 2px solid var(--yellow);
  outline-offset: -4px;
}

.page-faq #fmt-csv:checked ~ .fmt__panes .fmt__pane[data-fmt="csv"],
.page-faq #fmt-xlsx:checked ~ .fmt__panes .fmt__pane[data-fmt="xlsx"],
.page-faq #fmt-png:checked ~ .fmt__panes .fmt__pane[data-fmt="png"] {
  display: block;
}

/* ---------- 联系支持 ---------- */
.page-faq .support-card {
  padding: clamp(22px, 3.4vw, 36px);
  background: var(--green);
}

.page-faq .support-card__lead {
  margin: 0 0 clamp(18px, 3vw, 28px);
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--gray);
}

.page-faq .support-card__list {
  margin: 0 0 clamp(20px, 3vw, 30px);
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-faq .support-card__item {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 16px;
  padding: 14px 16px;
  background: var(--ink);
}

.page-faq .support-card__key {
  flex: 0 0 84px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gray);
  align-self: center;
}

.page-faq .support-card__val {
  flex: 1 1 auto;
  margin: 0;
  font-size: 15px;
  font-weight: 700;
  color: var(--white);
  word-break: break-all;
}

.page-faq .support-card__val.num {
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}

.page-faq .support-card__cta {
  text-decoration: none;
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-faq .faq-hero__stats {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-faq .steps {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-faq .support-card__list {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-layout {
    grid-template-columns: 236px minmax(0, 1fr);
    gap: clamp(40px, 5vw, 72px);
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: var(--faq-sticky-top);
  }

  .page-faq .faq-index__nav {
    display: block;
    overflow: visible;
    border-bottom: 0;
    padding-bottom: 0;
  }

  .page-faq .faq-index__item {
    padding: 11px 0 11px 14px;
    white-space: normal;
  }

  .page-faq .faq-index__anno {
    display: block;
  }

  .page-faq .faq-hero__title {
    max-width: 22ch;
  }

  .page-faq .qa__q {
    font-size: 18px;
  }
}

@media (min-width: 1280px) {
  .page-faq .support-card__list {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa summary,
  .page-faq .qa summary::after,
  .page-faq .fmt__tab,
  .page-faq .faq-index__item {
    transition: none;
  }
}