.page-faq {
  --faq-rail: 236px;
  --faq-pad-x: clamp(16px, 2.4vw, 22px);
  position: relative;
  isolation: isolate;
  color: var(--white);
  padding-bottom: clamp(56px, 9vw, 120px);
  overflow-x: clip;
}

.page-faq::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: clamp(420px, 66vh, 700px);
  background:
    radial-gradient(115% 88% at 84% 0%, rgba(41, 240, 208, 0.14), transparent 60%),
    radial-gradient(78% 66% at 4% 14%, rgba(255, 122, 26, 0.09), transparent 62%);
  pointer-events: none;
  z-index: -1;
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  padding-top: clamp(14px, 2.6vw, 32px);
  padding-bottom: clamp(28px, 4.6vw, 58px);
}

.page-faq .faq-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 52px);
  margin-top: clamp(22px, 3.4vw, 42px);
  align-items: end;
}

.page-faq .faq-hero__title {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(32px, 6.2vw, 66px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  max-width: 17ch;
}

.page-faq .faq-hero__lead {
  margin: 18px 0 0;
  max-width: 48ch;
  font-family: var(--font-body);
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.78;
  color: rgba(245, 248, 250, 0.8);
}

.page-faq .faq-hero__visual .media-frame {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--surface);
}

.page-faq .faq-hero__visual img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-faq .faq-hero__caption {
  margin: 12px 0 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--muted);
}

@media (min-width: 920px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-faq .faq-hero__visual {
    transform: translateY(clamp(8px, 2vw, 26px));
  }
}

/* ---------- 主体布局 ---------- */

.page-faq .faq-body {
  padding-top: clamp(8px, 1.8vw, 20px);
}

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 46px);
}

@media (min-width: 1000px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: calc(var(--header-h) + 26px);
  }
}

/* ---------- 左侧编号索引 ---------- */

.page-faq .faq-index__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-faq .faq-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.page-faq .faq-index__list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: rgba(16, 26, 36, 0.62);
  color: var(--muted);
  font-family: var(--font-body);
  font-size: 13.5px;
  line-height: 1.35;
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease),
    background-color var(--dur) var(--ease);
}

.page-faq .faq-index__list a:hover,
.page-faq .faq-index__list a:focus-visible {
  color: var(--white);
  border-color: var(--cyan-edge);
  background: var(--cyan-soft);
}

.page-faq .faq-index__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

@media (min-width: 1000px) {
  .page-faq .faq-index__list {
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
    border-left: 1px solid var(--line);
  }

  .page-faq .faq-index__list a {
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    background: none;
    padding: 11px 16px;
    margin-left: -1px;
    font-size: 14px;
  }

  .page-faq .faq-index__list a:hover,
  .page-faq .faq-index__list a:focus-visible {
    border-left-color: var(--cyan);
    background: linear-gradient(90deg, rgba(41, 240, 208, 0.13), transparent 82%);
  }
}

/* ---------- 分组 ---------- */

.page-faq .faq-group {
  scroll-margin-top: calc(var(--header-h) + 28px);
  padding-top: clamp(22px, 3.4vw, 36px);
}

.page-faq .faq-group + .faq-group {
  margin-top: clamp(26px, 4vw, 52px);
  border-top: 1px solid var(--line);
}

.page-faq .faq-group__head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 6px 14px;
  margin-bottom: clamp(14px, 2vw, 22px);
}

.page-faq .faq-group__num {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 4.4vw, 48px);
  line-height: 0.88;
  letter-spacing: -0.03em;
  color: rgba(41, 240, 208, 0.85);
}

@supports (-webkit-text-stroke: 1px currentColor) {
  .page-faq .faq-group__num {
    color: transparent;
    -webkit-text-stroke: 1.4px var(--cyan);
  }
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(21px, 2.6vw, 30px);
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.page-faq .faq-group__badge {
  margin-left: auto;
  padding: 4px 10px;
  border: 1px solid rgba(94, 122, 102, 0.72);
  border-radius: 999px;
  background: rgba(94, 122, 102, 0.18);
  color: #b3cbb9;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  white-space: nowrap;
}

.page-faq .faq-group__badge--adv {
  border-color: rgba(169, 106, 76, 0.72);
  background: rgba(169, 106, 76, 0.2);
  color: #e2b39a;
}

/* ---------- 折叠问答 ---------- */

.page-faq .faq-group__items {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.page-faq .disclosure {
  border-left: 2px solid transparent;
  border-bottom: 1px solid var(--line);
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-faq .disclosure[data-open] {
  border-left-color: var(--cyan);
  background: linear-gradient(90deg, rgba(41, 240, 208, 0.1), transparent 64%);
}

.page-faq .disclosure-toggle {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  width: 100%;
  padding: 16px var(--faq-pad-x) 16px var(--faq-pad-x);
  border: 0;
  background: transparent;
  color: var(--white);
  font-family: var(--font-body);
  font-size: clamp(15px, 1.5vw, 16.5px);
  font-weight: 600;
  line-height: 1.55;
  text-align: left;
  cursor: pointer;
}

.page-faq .disclosure-toggle::after {
  content: "";
  flex: none;
  width: 9px;
  height: 9px;
  margin-top: 7px;
  border-right: 2px solid var(--cyan);
  border-bottom: 2px solid var(--cyan);
  transform: rotate(45deg);
  transition: transform var(--dur) var(--ease);
}

.page-faq .disclosure[data-open] .disclosure-toggle::after {
  transform: rotate(-135deg);
}

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

.page-faq .disclosure-panel {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 280ms var(--ease);
}

.page-faq .disclosure[data-open] .disclosure-panel {
  grid-template-rows: 1fr;
}

.page-faq .disclosure-panel > .disclosure-inner {
  overflow: hidden;
  min-height: 0;
}

.page-faq .disclosure-inner p {
  margin: 0;
  padding: 0 var(--faq-pad-x) 18px;
  max-width: 62ch;
  font-family: var(--font-body);
  font-size: clamp(14.5px, 1.5vw, 16px);
  line-height: 1.78;
  color: rgba(245, 248, 250, 0.78);
}

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

/* ---------- 章节配图 ---------- */

.page-faq .faq-diagram {
  margin: 0 0 clamp(18px, 3vw, 28px);
}

.page-faq .faq-diagram .media-frame {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--surface);
}

.page-faq .faq-diagram img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-faq .faq-diagram figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

/* ---------- 收尾说明 ---------- */

.page-faq .faq-foot-note {
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--orange);
  max-width: 58ch;
  font-family: var(--font-body);
  font-size: clamp(14px, 1.5vw, 15.5px);
  line-height: 1.75;
  color: rgba(245, 248, 250, 0.75);
}

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

/* ---------- 窄屏修正 ---------- */

@media (max-width: 420px) {
  .page-faq .faq-index__list {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-faq .disclosure-toggle {
    gap: 12px;
    font-size: 15px;
  }

  .page-faq .faq-group__badge {
    margin-left: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .disclosure,
  .page-faq .disclosure-panel,
  .page-faq .disclosure-toggle::after,
  .page-faq .faq-index__list a {
    transition: none;
  }
}