.page-faq {
  --faq-index-w: 264px;
  --faq-gap: clamp(22px, 3.4vw, 48px);
  --faq-head-h: var(--header-h, 72px);
  background: var(--ink);
  color: var(--white);
}

.page-faq .faq-shell {
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(18px, 3.4vw, 36px) clamp(36px, 5.6vw, 72px);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(35, 38, 46, .6) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(35, 38, 46, .6) 1px, transparent 1px);
  background-size: 28px 28px;
  -webkit-mask-image: radial-gradient(130% 80% at 88% 0%, #000 0%, transparent 70%);
  mask-image: radial-gradient(130% 80% at 88% 0%, #000 0%, transparent 70%);
  pointer-events: none;
}

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

.page-faq .breadcrumb {
  margin-bottom: clamp(18px, 2.8vw, 34px);
}

.page-faq .faq-hero__eyebrow {
  display: inline-block;
  margin: 0 0 18px;
  padding-bottom: 6px;
  border-bottom: 2px solid var(--red);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .18em;
  color: var(--red);
}

.page-faq .faq-hero__title {
  margin: 0 0 20px;
  max-width: 17ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 7.4vw, 72px);
  line-height: 1.06;
  letter-spacing: -.02em;
}

.page-faq .faq-hero__lead {
  margin: 0 0 26px;
  max-width: 62ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.8;
  color: var(--slate);
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-faq .faq-hero__media {
  position: relative;
  margin: clamp(28px, 4.4vw, 52px) 0 0;
  border: 1px solid var(--line);
  overflow: hidden;
}

.page-faq .faq-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-faq .faq-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(118deg, rgba(224, 27, 46, .38) 0%, rgba(10, 11, 13, 0) 46%, rgba(10, 11, 13, .78) 100%);
  pointer-events: none;
}

/* ---------- 主体两段式 ---------- */
.page-faq .faq-wrap {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--faq-gap);
  padding-block: clamp(30px, 4.6vw, 64px) clamp(48px, 7vw, 92px);
}

/* ---------- 主题索引 ---------- */
.page-faq .faq-index {
  min-width: 0;
}

.page-faq .faq-index__label {
  margin: 0 0 12px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .16em;
  color: var(--slate);
}

.page-faq .faq-index__bar {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 2px 0 10px;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

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

.page-faq .filter-btn {
  flex: 0 0 auto;
  min-height: 44px;
  padding: 11px 18px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel);
  color: var(--slate);
  font: inherit;
  font-size: 14px;
  white-space: nowrap;
  cursor: pointer;
  transition: background-color .16s var(--ease), color .16s var(--ease), border-color .16s var(--ease);
}

.page-faq .filter-btn:hover {
  color: var(--white);
  border-color: #3a3f4b;
}

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

.page-faq .filter-btn.is-active {
  background: var(--red);
  border-color: var(--red);
  color: var(--white);
  font-weight: 700;
}

.page-faq .faq-index__hint {
  margin: 4px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--slate);
}

/* ---------- 问答流 ---------- */
.page-faq .faq-stream {
  display: flex;
  flex-direction: column;
  gap: clamp(30px, 4.4vw, 52px);
  min-width: 0;
}

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

.page-faq .faq-group[hidden] {
  display: none;
}

.page-faq .faq-group__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  padding-bottom: 14px;
  border-bottom: 2px solid var(--line);
}

.page-faq .faq-group__title {
  flex: 1 1 auto;
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(19px, 2.4vw, 26px);
  letter-spacing: -.01em;
}

.page-faq .qa {
  position: relative;
  padding-left: 14px;
  border-bottom: 1px solid var(--line);
  border-left: 3px solid transparent;
  transition: border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-faq .qa[open] {
  border-left-color: var(--blue);
  background-color: rgba(47, 107, 255, .05);
}

.page-faq .qa summary {
  position: relative;
  display: flex;
  gap: 12px;
  align-items: baseline;
  min-height: 44px;
  padding: 18px 34px 18px 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(16px, 1.75vw, 18.5px);
  line-height: 1.55;
  color: var(--white);
  list-style: none;
  cursor: pointer;
  transition: color .16s var(--ease);
}

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

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

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

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

.page-faq .qa summary::after {
  content: "+";
  position: absolute;
  right: 4px;
  top: 17px;
  display: grid;
  place-items: center;
  width: 22px;
  height: 22px;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--red);
  transition: transform .2s var(--ease);
}

.page-faq .qa[open] summary::after {
  transform: rotate(45deg);
}

.page-faq .qa__no {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.9;
  letter-spacing: .04em;
  color: var(--blue);
}

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

.page-faq .qa__body {
  max-width: 66ch;
  padding-bottom: 22px;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--slate);
}

.page-faq .qa__verdict {
  margin: 0 0 14px;
  padding: 10px 14px;
  border-left: 2px solid var(--red);
  background: linear-gradient(90deg, rgba(224, 27, 46, .18), rgba(224, 27, 46, 0) 78%);
  color: var(--white);
  font-weight: 600;
}

.page-faq .qa__steps {
  counter-reset: qa-step;
  display: grid;
  gap: 9px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .qa__steps li {
  counter-increment: qa-step;
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
}

.page-faq .qa__steps li::before {
  content: counter(qa-step, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.95;
  letter-spacing: .04em;
  color: var(--blue);
}

.page-faq .qa__body a {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 107, 255, .45);
}

.page-faq .qa__body a:hover {
  color: var(--white);
  border-bottom-color: var(--red);
}

/* ---------- 示意图 ---------- */
.page-faq .faq-figure {
  margin: 6px 0 0;
  border: 1px solid var(--line);
  background: var(--panel);
  overflow: hidden;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-faq .faq-figure figcaption {
  padding: 11px 16px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.6;
  color: var(--slate);
}

/* ---------- 收束区 ---------- */
.page-faq .faq-help {
  border-top: 1px solid var(--line);
  background: var(--panel);
}

.page-faq .faq-help__inner {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  padding-block: clamp(40px, 6vw, 84px);
}

.page-faq .faq-help__title {
  margin: 8px 0 14px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(23px, 3.2vw, 36px);
  line-height: 1.2;
  letter-spacing: -.015em;
}

.page-faq .faq-help__lead {
  margin: 0;
  max-width: 44ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--slate);
}

.page-faq .faq-help__panel {
  min-width: 0;
  border: 1px solid var(--line);
  background: var(--ink);
  padding: clamp(18px, 2.6vw, 30px);
}

.page-faq .faq-help__list {
  display: grid;
  gap: 12px;
  margin: 0 0 24px;
  padding: 0;
  list-style: none;
}

.page-faq .faq-help__list li {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 10px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
  font-size: 15.5px;
  line-height: 1.7;
  color: var(--mist);
}

.page-faq .faq-help__list li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-faq .faq-help__no {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 2;
  letter-spacing: .04em;
  color: var(--red);
}

.page-faq .faq-help__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 16px;
}

.page-faq .faq-help__note {
  margin: 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--slate);
}

.page-faq .faq-help__note a {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 107, 255, .45);
}

.page-faq .faq-help__note a:hover {
  color: var(--white);
  border-bottom-color: var(--red);
}

/* ---------- 响应式 ---------- */
@media (min-width: 900px) {
  .page-faq .faq-wrap {
    grid-template-columns: var(--faq-index-w) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: calc(var(--faq-head-h) + 20px);
    padding: 18px;
    border: 1px solid var(--line);
    background: var(--panel);
  }

  .page-faq .faq-index__label {
    padding-bottom: 10px;
    border-bottom: 1px solid var(--line);
  }

  .page-faq .faq-index__bar {
    flex-direction: column;
    overflow: visible;
    padding: 0;
  }

  .page-faq .filter-btn {
    width: 100%;
    text-align: left;
  }

  .page-faq .faq-help__inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
    align-items: start;
  }
}

@media (min-width: 1180px) {
  .page-faq .faq-hero__title {
    max-width: 20ch;
  }

  .page-faq .qa__body {
    padding-left: 46px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq *,
  .page-faq *::before,
  .page-faq *::after {
    transition-duration: .001ms !important;
    animation-duration: .001ms !important;
  }
}