.page-faq {
  --faq-rule: var(--silver);
  --faq-soft: var(--graphite);
  background: var(--warm);
  color: var(--ink);
  padding-bottom: clamp(56px, 9vw, 120px);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  padding-top: clamp(22px, 3.6vw, 46px);
  padding-bottom: clamp(30px, 5vw, 64px);
}

.page-faq .faq-hero-grid {
  position: relative;
  padding-top: clamp(22px, 4vw, 44px);
}

.page-faq .faq-watermark {
  position: absolute;
  right: 0;
  top: clamp(-14px, -1.5vw, 0px);
  font-family: var(--font-mono);
  font-size: clamp(64px, 15vw, 176px);
  font-weight: 700;
  line-height: 0.78;
  letter-spacing: -0.05em;
  color: rgba(23, 22, 26, 0.055);
  pointer-events: none;
  user-select: none;
}

.page-faq .faq-kicker {
  position: relative;
  margin: 0 0 clamp(14px, 2vw, 22px);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--red);
}

.page-faq .faq-title {
  position: relative;
  margin: 0 0 clamp(18px, 2.6vw, 28px);
  max-width: 12em;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(32px, 7vw, 70px);
  line-height: 1.08;
  letter-spacing: -0.022em;
  text-wrap: balance;
}

.page-faq .faq-lead {
  position: relative;
  margin: 0;
  max-width: 40em;
  font-family: var(--font-body);
  font-size: clamp(15px, 1.15vw, 17px);
  line-height: 1.95;
  color: var(--faq-soft);
}

.page-faq .faq-meta {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--faq-rule);
}

.page-faq .faq-meta-item {
  flex: 1 1 148px;
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: 14px 16px 14px 0;
  border-right: 1px solid var(--faq-rule);
}

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

.page-faq .faq-meta-k {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--ink);
}

.page-faq .faq-meta-v {
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--faq-soft);
}

/* ---------- 筛选吸顶区 ---------- */
.page-faq .filter-dock {
  position: sticky;
  top: 0;
  z-index: 30;
  background: var(--warm);
  border-top: 1px solid var(--faq-rule);
  border-bottom: 1px solid var(--faq-rule);
}

.page-faq .filter-inner {
  display: flex;
  align-items: center;
  gap: 16px;
  padding-top: 11px;
  padding-bottom: 11px;
}

.page-faq .filter-label {
  display: none;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--faq-soft);
  white-space: nowrap;
}

.page-faq .filter-bar {
  display: flex;
  flex: 1 1 auto;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 2px;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-faq .filter-bar::-webkit-scrollbar {
  display: none;
}

.page-faq .filter-chip {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 13px;
  border: 1px solid var(--faq-rule);
  border-radius: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
  white-space: nowrap;
  cursor: pointer;
  transition: background-color .18s ease, border-color .18s ease, color .18s ease;
}

.page-faq .filter-chip:hover {
  border-color: var(--red);
  color: var(--red-deep);
}

.page-faq .filter-chip:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-faq .filter-chip[aria-pressed="true"],
.page-faq .filter-chip.is-active {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
}

.page-faq .filter-count {
  display: inline-block;
  min-width: 20px;
  padding: 1px 5px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  line-height: 1.5;
  text-align: center;
  background: var(--red);
  color: var(--paper);
}

.page-faq .filter-chip[aria-pressed="true"] .filter-count,
.page-faq .filter-chip.is-active .filter-count {
  background: var(--cyan);
  color: var(--ink);
}

/* ---------- 章节 ---------- */
.page-faq .faq-main {
  padding-top: clamp(30px, 4.5vw, 58px);
}

.page-faq .faq-section + .faq-section {
  margin-top: clamp(38px, 5.5vw, 76px);
  padding-top: clamp(38px, 5.5vw, 76px);
  border-top: 1px solid var(--faq-rule);
}

.page-faq .faq-section-head {
  display: grid;
  gap: 10px;
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-faq .section-kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--red);
}

.page-faq .section-title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(21px, 3.4vw, 34px);
  line-height: 1.16;
  letter-spacing: -0.015em;
}

.page-faq .section-note {
  margin: 0;
  max-width: 38em;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--faq-soft);
}

/* ---------- 条目列表 ---------- */
.page-faq .faq-list {
  border-top: 1px solid var(--faq-rule);
}

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

.page-faq .qa::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 0;
  background: var(--red);
  transition: width .2s ease;
}

.page-faq .qa[open]::before {
  width: 2px;
}

.page-faq .qa-q {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 4px 12px;
  align-items: start;
  padding: clamp(16px, 2vw, 20px) 0;
  list-style: none;
  cursor: pointer;
  transition: background-color .18s ease;
}

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

.page-faq .qa-q::marker {
  content: "";
}

.page-faq .qa-q:hover {
  background: var(--paper);
}

.page-faq .qa-q:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

.page-faq .qa-no {
  padding-top: 5px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--red);
  white-space: nowrap;
}

.page-faq .qa-q-text {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(15.5px, 1.55vw, 19px);
  line-height: 1.5;
  letter-spacing: -0.005em;
  color: var(--ink);
}

.page-faq .qa-sign {
  position: relative;
  width: 15px;
  height: 15px;
  margin-top: 5px;
}

.page-faq .qa-sign::before,
.page-faq .qa-sign::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--graphite);
  transition: transform .2s ease, background-color .2s ease;
}

.page-faq .qa-sign::before {
  width: 13px;
  height: 1px;
  transform: translate(-50%, -50%);
}

.page-faq .qa-sign::after {
  width: 1px;
  height: 13px;
  transform: translate(-50%, -50%);
}

.page-faq .qa[open] .qa-sign::before {
  background: var(--red);
}

.page-faq .qa[open] .qa-sign::after {
  transform: translate(-50%, -50%) scaleY(0);
}

.page-faq .qa-a {
  padding: 0 0 clamp(18px, 2.4vw, 28px);
  animation: faqReveal .22s ease both;
}

@keyframes faqReveal {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: none; }
}

.page-faq .qa-a p {
  margin: 0 0 14px;
  max-width: 42em;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.95;
  color: var(--faq-soft);
}

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

.page-faq .qa-a a {
  color: var(--deep-teal);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  padding-bottom: 1px;
}

.page-faq .qa-a a:hover {
  color: var(--red-deep);
}

.page-faq .qa-meta {
  display: flex;
  flex-wrap: wrap;
  max-width: 560px;
  margin: 0 0 14px;
  padding: 0;
  border-top: 1px solid var(--faq-rule);
  border-left: 1px solid var(--faq-rule);
}

.page-faq .qa-meta-row {
  flex: 1 1 168px;
  padding: 10px 13px;
  border-right: 1px solid var(--faq-rule);
  border-bottom: 1px solid var(--faq-rule);
}

.page-faq .qa-meta-row dt {
  margin: 0 0 5px;
  font-size: 10.5px;
  letter-spacing: 0.18em;
  color: var(--faq-soft);
}

.page-faq .qa-meta-row dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  line-height: 1.55;
  color: var(--ink);
}

.page-faq .qa-foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 16px;
}

.page-faq .qa-ver {
  display: inline-block;
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  background: var(--paper);
  border: 1px solid var(--faq-rule);
  color: var(--deep-teal);
  white-space: nowrap;
}

.page-faq .qa-rel {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--faq-soft);
}

/* ---------- 图与流程 ---------- */
.page-faq .faq-figure {
  margin: 0 0 clamp(22px, 3vw, 32px);
}

.page-faq .faq-figure .image-frame {
  display: block;
  overflow: hidden;
  background: var(--paper);
  border: 1px solid var(--faq-rule);
}

.page-faq .faq-figure[data-ratio] .image-frame,
.page-faq .faq-figure .image-frame[data-ratio="21x9"] {
  aspect-ratio: 21 / 9;
}

.page-faq .faq-figure .image-frame[data-ratio="1x1"] {
  aspect-ratio: 1 / 1;
}

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

.page-faq .figure-cap {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--faq-soft);
}

.page-faq .faq-flow {
  margin: 0 0 clamp(22px, 3vw, 34px);
  padding: clamp(14px, 2vw, 24px);
  overflow-x: auto;
  background: var(--paper);
  border: 1px solid var(--faq-rule);
  scrollbar-width: none;
}

.page-faq .faq-flow::-webkit-scrollbar {
  display: none;
}

.page-faq .flow-svg {
  display: block;
  width: 100%;
  min-width: 620px;
  height: auto;
}

.page-faq .flow-step rect {
  fill: var(--warm);
  stroke: var(--faq-rule);
  stroke-width: 1;
}

.page-faq .flow-num {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  fill: var(--red);
}

.page-faq .flow-label {
  font-family: var(--font-head);
  font-size: 13px;
  font-weight: 700;
  fill: var(--ink);
}

.page-faq .flow-edge {
  stroke: var(--faq-rule);
  stroke-width: 1;
}

.page-faq .flow-step--end rect {
  fill: var(--cyan);
  stroke: var(--cyan);
}

.page-faq .flow-step--end .flow-num {
  fill: var(--paper);
}

/* ---------- 出口 ---------- */
.page-faq .faq-exit {
  margin-top: clamp(40px, 6vw, 80px);
  border: 1px solid var(--faq-rule);
  border-left: 3px solid var(--red);
  background: var(--paper);
}

.page-faq .faq-exit-inner {
  display: grid;
  gap: 12px;
  padding: clamp(22px, 3.4vw, 44px);
}

.page-faq .faq-exit-kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.22em;
  color: var(--red);
}

.page-faq .faq-exit-title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(21px, 3.2vw, 32px);
  line-height: 1.18;
  letter-spacing: -0.012em;
}

.page-faq .faq-exit-body {
  margin: 0;
  max-width: 44em;
  font-size: 15px;
  line-height: 1.95;
  color: var(--faq-soft);
}

.page-faq .faq-mail {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
  background: rgba(18, 181, 166, 0.16);
  padding: 2px 6px;
}

.page-faq .faq-exit-links {
  margin: 0;
  max-width: 44em;
  font-size: 14px;
  line-height: 1.95;
  color: var(--faq-soft);
}

.page-faq .faq-exit-links a {
  color: var(--deep-teal);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  padding-bottom: 1px;
}

.page-faq .faq-exit-links a:hover {
  color: var(--red-deep);
}

/* ---------- 平板以上 ---------- */
@media (min-width: 760px) {
  .page-faq .filter-label {
    display: block;
  }

  .page-faq .qa-q {
    gap: 4px 20px;
    padding-right: clamp(8px, 1vw, 16px);
  }

  .page-faq .qa-a {
    padding-left: clamp(0px, 4vw, 56px);
  }
}

@media (min-width: 900px) {
  .page-faq .faq-section-head {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    column-gap: clamp(28px, 4vw, 68px);
    row-gap: 12px;
  }

  .page-faq .section-kicker {
    grid-column: 1;
    grid-row: 1;
  }

  .page-faq .section-title {
    grid-column: 1;
    grid-row: 2;
  }

  .page-faq .section-note {
    grid-column: 2;
    grid-row: 2;
    align-self: end;
  }

  .page-faq .faq-split {
    display: grid;
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
    column-gap: clamp(28px, 4vw, 58px);
    align-items: start;
  }

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

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

  .page-faq .qa::before,
  .page-faq .qa-sign::before,
  .page-faq .qa-sign::after,
  .page-faq .filter-chip,
  .page-faq .qa-q {
    transition: none;
  }
}