.page-faq {
  --faq-cut: 16px;
  --faq-ink-soft: rgba(237, 245, 250, 0.78);
  --faq-line-soft: rgba(126, 151, 188, 0.2);
  background: var(--ink-1);
  color: var(--paper);
  font-family: var(--font-body);
}

.page-faq .faq-cut-media {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  clip-path: polygon(0 0, calc(100% - var(--faq-cut)) 0, 100% var(--faq-cut), 100% 100%, var(--faq-cut) 100%, 0 calc(100% - var(--faq-cut)));
  background: var(--ink-2);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(36px, 6vw, 76px) 0 clamp(32px, 4vw, 56px);
  background:
    radial-gradient(115% 85% at 86% -6%, rgba(47, 224, 206, 0.12), transparent 58%),
    radial-gradient(80% 70% at 8% 110%, rgba(240, 180, 90, 0.1), transparent 62%),
    linear-gradient(180deg, var(--ink-0) 0%, var(--ink-1) 100%);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line) 1px, transparent 1px);
  background-size: 96px 96px;
  opacity: 0.45;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 88%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 88%);
  pointer-events: none;
}

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

.page-faq .faq-hero .eyebrow {
  display: block;
  margin: 0 0 16px;
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-faq .faq-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
  margin-top: 26px;
}

.page-faq .faq-hero__title {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(30px, 7.2vw, 68px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-faq .faq-hero__title em {
  display: block;
  font-style: normal;
  color: var(--cyan);
}

.page-faq .faq-hero__lede {
  margin: 22px 0 0;
  max-width: 44ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--faq-ink-soft);
}

.page-faq .faq-hero__media {
  position: relative;
  filter: drop-shadow(0 18px 40px rgba(4, 12, 24, 0.55));
}

.page-faq .faq-hero__media::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -10px;
  width: 68px;
  height: 2px;
  background: var(--amber);
}

/* ---------- 主题切换与问答 ---------- */
.page-faq .faq-switch {
  padding: clamp(32px, 5vw, 56px) 0 clamp(48px, 7vw, 88px);
  background: var(--ink-1);
}

.page-faq .faq-switch .tabbar {
  margin-bottom: clamp(28px, 4vw, 44px);
}

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

.page-faq .faq-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
}

.page-faq .faq-index {
  border-left: 1px solid var(--line);
  padding-left: 0;
}

.page-faq .faq-index .eyebrow {
  display: block;
  margin: 0 0 8px;
  padding-left: 14px;
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-faq .faq-index__hint {
  margin: 0 0 14px;
  padding-left: 14px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

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

.page-faq .faq-index__link {
  display: block;
  margin-left: -1px;
  padding: 8px 0 8px 14px;
  border-left: 2px solid transparent;
  font-size: 14px;
  line-height: 1.55;
  color: var(--mist);
  text-decoration: none;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  color: var(--paper);
  border-left-color: var(--cyan);
  outline: none;
}

.page-faq .faq-body__title {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(22px, 4vw, 30px);
  line-height: 1.26;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-faq .faq-body__lede {
  margin: 10px 0 22px;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

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

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

.page-faq .qa details {
  position: relative;
}

.page-faq .qa details::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--cyan);
  transform: scaleY(0);
  transform-origin: top center;
  transition: transform 220ms var(--ease);
}

.page-faq .qa details[open]::before {
  transform: scaleY(1);
}

.page-faq .qa summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 14px;
  align-items: start;
  padding: 18px 0 18px 16px;
  cursor: pointer;
  list-style: none;
  transition: background-color 180ms var(--ease);
}

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

.page-faq .qa summary:hover {
  background: rgba(47, 224, 206, 0.05);
}

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

.page-faq .qa__num {
  font-size: 12px;
  line-height: 1.9;
  letter-spacing: 0.06em;
  color: var(--amber);
}

.page-faq .qa__q {
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: 16px;
  line-height: 1.6;
  color: var(--paper);
}

.page-faq .qa__sign {
  position: relative;
  width: 14px;
  height: 14px;
  margin-top: 6px;
}

.page-faq .qa__sign::before,
.page-faq .qa__sign::after {
  content: "";
  position: absolute;
  background: var(--cyan);
  border-radius: 1px;
  transition: transform 200ms var(--ease), opacity 200ms var(--ease);
}

.page-faq .qa__sign::before {
  left: 0;
  top: 6px;
  width: 14px;
  height: 2px;
}

.page-faq .qa__sign::after {
  left: 6px;
  top: 0;
  width: 2px;
  height: 14px;
}

.page-faq .qa details[open] .qa__sign::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-faq .qa__answer {
  padding: 0 0 22px 16px;
  margin-left: 0;
  border-left: 1px solid var(--faq-line-soft);
}

.page-faq .qa__answer p {
  margin: 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.82;
  color: var(--faq-ink-soft);
}

.page-faq .qa__answer a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-faq .qa__answer a:hover {
  color: var(--paper);
}

/* ---------- 结尾求助区 ---------- */
.page-faq .faq-help {
  position: relative;
  background: linear-gradient(160deg, var(--ink-2) 0%, var(--ink-0) 100%);
  border-top: 1px solid var(--line-strong);
}

.page-faq .faq-help::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 34%;
  height: 3px;
  background: linear-gradient(90deg, var(--amber), transparent);
}

.page-faq .faq-help__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 34px;
  padding: clamp(36px, 6vw, 72px) 0;
}

.page-faq .faq-help .eyebrow {
  display: block;
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-faq .faq-help__title {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(24px, 4.6vw, 38px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-faq .faq-help__desc {
  margin: 16px 0 26px;
  max-width: 44ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--faq-ink-soft);
}

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

.page-faq .faq-help__side {
  display: grid;
  gap: 24px;
  align-content: start;
}

.page-faq .faq-help__contact {
  display: grid;
  gap: 4px;
}

.page-faq .faq-contact__row {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-contact__key {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-faq .faq-contact__val {
  font-size: 14px;
  line-height: 1.5;
  color: var(--paper);
  word-break: break-all;
}

.page-faq .faq-help__note {
  margin: 14px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--warm);
}

.page-faq .faq-help__meta {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

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

.page-faq .faq-help__meta a:hover {
  color: var(--paper);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-faq .qa summary {
    padding: 22px 0 22px 20px;
    gap: 18px;
  }

  .page-faq .qa__q {
    font-size: 17px;
  }

  .page-faq .qa__answer {
    padding: 0 0 26px 76px;
    border-left: 0;
    margin-left: 0;
  }

  .page-faq .qa__answer p {
    font-size: 16px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: end;
    gap: 48px;
  }

  .page-faq .faq-hero__lede {
    font-size: 17px;
  }

  .page-faq .faq-help__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
    gap: 56px;
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-split {
    grid-template-columns: 232px minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: 92px;
  }

  .page-faq .qa__answer {
    padding-left: 0;
    margin-left: 82px;
    border-left: 1px solid var(--faq-line-soft);
    padding-left: 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa details::before,
  .page-faq .qa__sign::before,
  .page-faq .qa__sign::after,
  .page-faq .faq-index__link,
  .page-faq .qa summary {
    transition: none;
  }
}