.page-faq {
  --faq-rail: 236px;
  --faq-gap: clamp(24px, 3.4vw, 56px);
  position: relative;
  overflow-x: clip;
  padding-bottom: calc(var(--step) * 12);
  background:
    radial-gradient(1100px 560px at 12% -10%, rgba(33, 230, 193, 0.1), transparent 60%),
    radial-gradient(900px 520px at 96% 2%, rgba(255, 106, 26, 0.08), transparent 58%),
    var(--ink);
  color: var(--text);
  font-family: var(--font-body);
}

.page-faq::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.5;
  background-image:
    linear-gradient(to right, rgba(43, 74, 66, 0.42) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(43, 74, 66, 0.42) 1px, transparent 1px);
  background-size: 96px 96px;
  -webkit-mask-image: linear-gradient(to bottom, #000 0, transparent 70%);
  mask-image: linear-gradient(to bottom, #000 0, transparent 70%);
}

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

/* 首屏 */
.page-faq .faq-hero {
  padding: clamp(96px, 12vw, 142px) 0 calc(var(--step) * 5);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-hero__grid {
  display: grid;
  gap: calc(var(--step) * 4);
  align-items: end;
}

.page-faq .faq-hero h1 {
  margin: calc(var(--step) * 2) 0 0;
  max-width: 16em;
  font-size: clamp(28px, 5.4vw, 50px);
  font-weight: 700;
  line-height: 1.14;
  letter-spacing: -0.01em;
}

.page-faq .faq-hero__lead {
  margin: calc(var(--step) * 2.5) 0 0;
  max-width: 34em;
  font-size: clamp(15px, 1.15vw, 17px);
  line-height: 1.8;
  color: var(--text);
  opacity: 0.84;
}

.page-faq .faq-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: var(--line);
  overflow: hidden;
}

.page-faq .faq-stat {
  display: grid;
  gap: 6px;
  padding: calc(var(--step) * 2);
  background: var(--panel);
  min-width: 0;
}

.page-faq .faq-stat .display-num {
  font-family: var(--font-display);
  font-size: clamp(26px, 6.4vw, 40px);
  font-weight: 700;
  line-height: 0.9;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-faq .faq-stat__unit {
  margin-left: 2px;
  font-family: var(--font-body);
  font-size: 0.45em;
  font-weight: 400;
  color: var(--muted);
}

.page-faq .faq-stat__label {
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.4;
  letter-spacing: 0.1em;
  color: var(--muted);
}

/* 主体布局 */
.page-faq .faq-layout {
  display: grid;
  gap: var(--faq-gap);
  padding-top: calc(var(--step) * 6);
}

.page-faq .faq-rail {
  border-left: 1px solid var(--line);
  padding-left: calc(var(--step) * 2);
}

.page-faq .faq-rail__label {
  margin: 0 0 calc(var(--step) * 1.5);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-faq .faq-rail__list {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-rail__link {
  display: flex;
  align-items: baseline;
  gap: calc(var(--step) * 1.5);
  padding: 10px 10px;
  border-radius: 8px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.5;
  text-decoration: none;
  transition: color 180ms var(--ease), background-color 180ms var(--ease);
}

.page-faq .faq-rail__link .index-num {
  color: var(--cyan);
  font-size: 11px;
}

.page-faq .faq-rail__link:hover {
  color: var(--text);
  background: var(--panel);
}

.page-faq .faq-rail__link:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 2px;
  color: var(--text);
}

/* 分类区块 */
.page-faq .faq-sec {
  scroll-margin-top: 104px;
}

.page-faq .faq-sec + .faq-sec {
  margin-top: calc(var(--step) * 5);
  padding-top: calc(var(--step) * 5);
  border-top: 1px dashed var(--line);
}

.page-faq .faq-sec__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: calc(var(--step) * 2);
  padding-bottom: calc(var(--step) * 2);
  border-bottom: 1px dashed var(--line);
}

.page-faq .faq-sec__head h2 {
  margin: 0;
  font-size: clamp(20px, 2.6vw, 26px);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

.page-faq .faq-sec__head .index-num {
  flex: 0 0 auto;
  color: var(--muted);
}

.page-faq .faq-sec__intro {
  margin: calc(var(--step) * 2) 0 calc(var(--step) * 2.5);
  max-width: 38em;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
}

.page-faq .faq-sec__intro a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(33, 230, 193, 0.4);
}

.page-faq .faq-sec__intro a:hover {
  border-bottom-color: var(--cyan);
}

.page-faq .faq-sec__intro a:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 2px;
}

.page-faq .faq-sec__split {
  display: grid;
  gap: calc(var(--step) * 3);
}

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

/* 可展开问答 */
.page-faq .index-group {
  border-bottom: 1px solid var(--line);
  background: transparent;
}

.page-faq .index-group__summary {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: calc(var(--step) * 2);
  padding: calc(var(--step) * 2.25) calc(var(--step) * 1.5) calc(var(--step) * 2.25) 0;
  cursor: pointer;
  list-style: none;
  transition: box-shadow 180ms var(--ease);
}

.page-faq .index-group__summary::-webkit-details-marker {
  display: none;
}

.page-faq .index-group__summary h3 {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.55;
  letter-spacing: -0.005em;
  color: var(--text);
  transition: color 180ms var(--ease);
}

.page-faq .index-group__summary:hover h3 {
  color: var(--cyan);
}

.page-faq .index-group__summary:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: -2px;
}

.page-faq .index-group[open] .index-group__summary {
  box-shadow: inset 0 1px 0 var(--cyan);
}

.page-faq .index-group__mark {
  position: relative;
  flex: 0 0 auto;
  width: 22px;
  height: 22px;
  margin-top: 2px;
  border: 1px solid var(--line);
  border-radius: 50%;
  transition: transform 220ms var(--ease), border-color 180ms var(--ease);
}

.page-faq .index-group__mark::before,
.page-faq .index-group__mark::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  background: var(--cyan);
  translate: -50% -50%;
}

.page-faq .index-group__mark::before {
  width: 9px;
  height: 1.5px;
}

.page-faq .index-group__mark::after {
  width: 1.5px;
  height: 9px;
}

.page-faq .index-group[open] .index-group__mark {
  transform: rotate(45deg);
  border-color: var(--cyan);
}

.page-faq .index-group__body {
  max-width: 40em;
  padding: 0 calc(var(--step) * 1.5) calc(var(--step) * 2.5) 0;
  color: var(--muted);
  font-size: 15.5px;
  line-height: 1.8;
}

.page-faq .index-group__body p {
  margin: 0;
}

.page-faq .index-group__body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(33, 230, 193, 0.4);
}

.page-faq .index-group__body a:hover {
  border-bottom-color: var(--cyan);
}

.page-faq .faq-num {
  font-family: var(--font-mono);
  font-size: 0.95em;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

/* 图示 */
.page-faq .faq-figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: var(--night);
  overflow: hidden;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.7) brightness(0.86);
}

/* 联系方式 */
.page-faq .faq-contact {
  margin-bottom: calc(var(--step) * 3);
  padding: calc(var(--step) * 3);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: linear-gradient(160deg, var(--panel), var(--night));
  box-shadow: var(--shadow-float);
}

.page-faq .faq-contact__list {
  display: grid;
  gap: calc(var(--step) * 2);
  margin: 0;
}

.page-faq .faq-contact__list div {
  display: grid;
  gap: 6px;
  min-width: 0;
}

.page-faq .faq-contact__list dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-faq .faq-contact__list dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text);
  overflow-wrap: anywhere;
}

.page-faq .faq-contact__value {
  font-family: var(--font-mono);
  font-size: 16px;
  letter-spacing: 0.02em;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-faq .faq-contact__note {
  margin: calc(var(--step) * 2.5) 0 0;
  padding-top: calc(var(--step) * 2);
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
  line-height: 1.75;
}

.page-faq .faq-contact__note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(33, 230, 193, 0.4);
}

.page-faq .faq-contact__note a:hover {
  border-bottom-color: var(--cyan);
}

/* 收尾 */
.page-faq .faq-cta {
  display: grid;
  gap: calc(var(--step) * 3);
  margin-top: calc(var(--step) * 8);
  padding: calc(var(--step) * 4);
  border: 1px solid var(--line);
  border-radius: calc(var(--radius-card) + 4px);
  background:
    radial-gradient(560px 300px at 88% 12%, rgba(255, 106, 26, 0.14), transparent 62%),
    linear-gradient(150deg, var(--night), var(--panel));
  overflow: hidden;
}

.page-faq .faq-cta h2 {
  margin: var(--step) 0 0;
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.01em;
}

.page-faq .faq-cta p {
  max-width: 34em;
  margin: calc(var(--step) * 1.5) 0 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
}

.page-faq .faq-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: calc(var(--step) * 1.5);
  margin-top: calc(var(--step) * 3);
}

.page-faq .faq-cta__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-card);
  object-fit: cover;
  filter: saturate(0.8) brightness(0.8);
}

/* 断点 */
@media (max-width: 979px) {
  .page-faq .faq-rail {
    margin: 0 calc(var(--gutter) * -1);
    padding: 0 var(--gutter) calc(var(--step) * 1.5);
    border-left: 0;
    border-bottom: 1px solid var(--line);
  }

  .page-faq .faq-rail__list {
    grid-auto-flow: column;
    grid-auto-columns: max-content;
    gap: 8px;
    overflow-x: auto;
    padding-bottom: 4px;
    scrollbar-width: thin;
  }

  .page-faq .faq-rail__link {
    padding: 8px 14px;
    border: 1px solid var(--line);
    border-radius: var(--radius-pill);
    white-space: nowrap;
  }
}

@media (min-width: 720px) {
  .page-faq .faq-contact__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 880px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.65fr);
    gap: calc(var(--step) * 5);
  }

  .page-faq .faq-hero__stats {
    grid-template-columns: 1fr;
  }

  .page-faq .faq-stat {
    padding: calc(var(--step) * 2) calc(var(--step) * 2.5);
  }

  .page-faq .faq-cta {
    grid-template-columns: minmax(0, 1fr) 260px;
    align-items: center;
    padding: calc(var(--step) * 5);
  }
}

@media (min-width: 980px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 104px;
  }
}

@media (min-width: 1040px) {
  .page-faq .faq-sec__split {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    gap: var(--faq-gap);
    align-items: start;
  }
}

@media (max-width: 520px) {
  .page-faq .faq-stat {
    padding: calc(var(--step) * 1.5) calc(var(--step) * 1.25);
  }

  .page-faq .faq-stat__label {
    font-size: 10px;
    letter-spacing: 0.06em;
  }

  .page-faq .index-group__summary h3 {
    font-size: 15px;
  }

  .page-faq .index-group__body {
    font-size: 15px;
  }

  .page-faq .faq-contact {
    padding: calc(var(--step) * 2);
  }
}