.page-faq {
  --faq-rail: 268px;
  --faq-gap: 26px;
}

.page-faq .faq-hero {
  position: relative;
  margin-top: 18px;
  padding: 26px 18px 22px;
  border: 1px solid var(--line);
  background-image:
    repeating-linear-gradient(0deg, transparent 0 23px, var(--line-soft) 23px 24px),
    repeating-linear-gradient(90deg, transparent 0 23px, var(--line-soft) 23px 24px),
    linear-gradient(155deg, var(--panel) 0%, var(--ink) 78%);
  overflow: hidden;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  right: -1px;
  bottom: -1px;
  width: 64px;
  height: 64px;
  border-right: 2px solid var(--cyan);
  border-bottom: 2px solid var(--cyan);
  opacity: .8;
  pointer-events: none;
}

.page-faq .faq-hero h1 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 900;
  font-size: clamp(30px, 7.4vw, 56px);
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--white);
}

.page-faq .faq-hero__lede {
  max-width: 66ch;
  margin: 14px 0 0;
  line-height: 1.8;
  color: var(--muted);
}

.page-faq .faq-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--white);
}

.page-faq .faq-hero__meta li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-faq .faq-hero__note {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--muted);
}

/* 快速自查 */
.page-faq .faq-quick {
  margin-top: 38px;
}

.page-faq .quick-grid {
  display: grid;
  gap: 14px;
  margin-top: 18px;
}

.page-faq .quick-card {
  position: relative;
  padding: 16px 16px 18px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan);
  background: var(--panel);
}

.page-faq .quick-card:nth-child(2) {
  border-left-color: var(--orange);
}

.page-faq .quick-card__num {
  margin: 0;
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--muted);
}

.page-faq .quick-card h3 {
  margin: 10px 0 8px;
  font-size: 17px;
  line-height: 1.5;
  color: var(--white);
}

.page-faq .quick-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

.page-faq .quick-card__link {
  display: inline-block;
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

.page-faq .quick-card__link:hover,
.page-faq .quick-card__link:focus-visible {
  color: var(--white);
}

/* 主体骨架：索引 + 问答 */
.page-faq .faq-shell {
  display: grid;
  gap: var(--faq-gap);
  margin-top: 40px;
}

.page-faq .faq-rail {
  border-top: 2px solid var(--cyan);
  padding-top: 14px;
}

.page-faq .faq-filter {
  margin-top: 14px;
}

.page-faq .faq-filter__label {
  display: block;
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--muted);
}

.page-faq .faq-filter__input {
  display: block;
  width: 100%;
  margin-top: 8px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 0;
  background: var(--ink);
  color: var(--white);
  font-family: var(--font-mono);
  font-size: 13px;
}

.page-faq .faq-filter__input::placeholder {
  color: var(--muted);
  opacity: .8;
}

.page-faq .faq-filter__input:focus {
  outline: none;
  border-color: var(--cyan);
}

.page-faq .faq-index {
  margin: 16px 0 0;
  padding: 0 0 0 14px;
  list-style: none;
  border-left: 1px solid var(--line);
}

.page-faq .faq-index a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.5;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .12s ease, border-color .12s ease;
}

.page-faq .faq-index a:hover,
.page-faq .faq-index a:focus-visible {
  color: var(--white);
  border-bottom-color: var(--cyan);
}

.page-faq .faq-index__idx {
  flex: none;
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--cyan);
}

/* 问答分组 */
.page-faq .faq-group + .faq-group {
  margin-top: 40px;
}

.page-faq .faq-split {
  display: grid;
  gap: 18px;
  margin-top: 18px;
}

.page-faq .faq-figure {
  margin: 18px 0 0;
}

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

.page-faq .qa-list {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

.page-faq .faq-split .qa-list {
  margin-top: 0;
}

.page-faq .qa {
  border: 1px solid var(--line);
  border-left: 3px solid var(--line);
  background: var(--panel);
  transition: border-left-color .12s ease;
}

.page-faq .qa[open] {
  border-left-color: var(--cyan);
}

.page-faq .qa:hover {
  border-left-color: var(--cyan);
}

.page-faq .qa > summary {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 14px 42px 14px 15px;
  position: relative;
  cursor: pointer;
  list-style: none;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.55;
  color: var(--white);
}

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

.page-faq .qa > summary::after {
  content: "";
  position: absolute;
  right: 17px;
  top: 22px;
  width: 0;
  height: 0;
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-top: 6px solid var(--cyan);
  transition: transform .18s ease;
}

.page-faq .qa[open] > summary::after {
  transform: rotate(180deg);
}

.page-faq .qa__idx {
  flex: none;
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--cyan);
  padding-top: 3px;
}

.page-faq .qa__body {
  padding: 0 16px 16px 15px;
  border-top: 1px solid var(--line);
}

.page-faq .qa__body p {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-faq .qa__actions {
  margin-top: 14px;
}

.page-faq .faq-stats {
  display: grid;
  gap: 12px;
  margin: 20px 0 0;
  padding: 16px 0;
  list-style: none;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-stats .stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-faq .faq-stats .stat__value {
  font-size: 34px;
  line-height: 1;
}

.page-faq .faq-stats .stat__label {
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--muted);
}

.page-faq .faq-group__more {
  margin: 16px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
}

.page-faq .faq-group__more a {
  color: var(--orange);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

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

/* 底部对接 */
.page-faq .faq-contact-box {
  margin-top: 18px;
  padding: 20px 18px;
  border: 1px solid var(--line);
  border-top: 3px solid var(--orange);
  background: var(--panel);
}

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

.page-faq .faq-contact-box__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

/* 窄屏加宽 */
@media (min-width: 620px) {
  .page-faq .quick-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-faq .faq-hero {
    padding: 34px 28px 28px;
  }

  .page-faq .faq-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-faq .faq-stats .stat + .stat {
    border-left: 1px solid var(--line);
    padding-left: 14px;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-shell {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
    gap: 44px;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 18px;
  }

  .page-faq .faq-split {
    grid-template-columns: 260px minmax(0, 1fr);
    gap: 24px;
    align-items: start;
  }

  .page-faq .faq-hero {
    padding: 46px 44px 36px;
  }
}

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