/* ===== 答疑中心 · 页面专属样式 ===== */
.page-faq {
  display: block;
}

/* --- 首屏 --- */
.page-faq .faq-hero {
  position: relative;
  isolation: isolate;
  padding: clamp(30px, 5.5vw, 72px) 0 clamp(24px, 4vw, 42px);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(30, 44, 87, 0.55) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(30, 44, 87, 0.55) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: radial-gradient(80% 74% at 92% 6%, #000 0%, transparent 72%);
  mask-image: radial-gradient(80% 74% at 92% 6%, #000 0%, transparent 72%);
}

.page-faq .faq-hero__title {
  margin: 16px 0 0;
  max-width: 22ch;
  font-size: var(--fs-h1);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--c-mist);
}

.page-faq .faq-hero__accent {
  color: var(--c-cyan);
}

.page-faq .faq-hero__lede {
  margin-top: 22px;
  max-width: 62ch;
}

.page-faq .faq-hero__meta {
  margin: 18px 0 0;
  font-size: var(--fs-label);
  letter-spacing: 0.08em;
  color: var(--c-cold);
}

/* --- 双栏主体 --- */
.page-faq .faq-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 5vw, 56px);
  align-items: start;
  border-top: 1px solid var(--c-line);
  padding-top: clamp(30px, 5vw, 54px);
  padding-bottom: clamp(56px, 9vw, 120px);
}

/* --- 左侧分类索引 --- */
.page-faq .faq-index {
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-width: 0;
}

.page-faq .faq-index__title {
  margin: 0;
  font-size: var(--fs-label);
  letter-spacing: 0.16em;
  color: var(--c-cold);
}

.page-faq .faq-index__nav {
  display: flex;
  flex-direction: column;
}

.page-faq .faq-index__link {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 12px 14px 12px 16px;
  border-left: 1px solid var(--c-line);
  color: var(--c-cold);
  font-size: 15px;
  line-height: 1.4;
  text-decoration: none;
  transition:
    color 180ms var(--ease),
    border-left-color 200ms var(--ease),
    background-color 200ms var(--ease);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  color: var(--c-mist);
  border-left-color: var(--c-cyan);
  background-color: rgba(33, 230, 208, 0.05);
}

.page-faq .faq-index__num {
  flex: none;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--c-amber);
}

/* --- 额度卡 --- */
.page-faq .faq-quota {
  margin-top: 4px;
  padding: 18px 16px;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  background: var(--c-midnight);
}

.page-faq .faq-quota__label {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-cold);
}

.page-faq .faq-quota__value {
  margin: 8px 0 14px;
  font-size: 14px;
  color: var(--c-mist);
}

.page-faq .faq-quota__value .mono {
  margin-right: 4px;
  font-size: 34px;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-glow);
}

.page-faq .faq-quota__meter {
  display: block;
  width: 100%;
  height: 4px;
  background: var(--c-abyss);
  border-radius: 999px;
  overflow: hidden;
}

.page-faq .meter__fill {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--c-glow), var(--c-amber));
}

/* --- 问答流 --- */
.page-faq .faq-stream {
  min-width: 0;
}

.page-faq .faq-section {
  margin-bottom: clamp(42px, 6vw, 84px);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-faq .faq-section:last-child {
  margin-bottom: 0;
}

.page-faq .faq-section__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--c-line);
}

.page-faq .faq-section__num {
  flex: none;
  font-family: var(--font-serif);
  font-size: clamp(26px, 3.6vw, 38px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-amber);
}

.page-faq .faq-section__title {
  margin: 0;
  font-size: var(--fs-h3);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--c-mist);
}

/* --- 问答条目 --- */
.page-faq .qa {
  position: relative;
  border-bottom: 1px solid var(--c-line);
  transition: background-color 200ms var(--ease);
}

.page-faq .qa[open] {
  background-image: linear-gradient(90deg, rgba(33, 230, 208, 0.05), transparent 58%);
}

.page-faq .qa__q {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 19px 10px 19px 28px;
  cursor: pointer;
  list-style: none;
  color: var(--c-mist);
}

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

.page-faq .qa__q::marker {
  display: none;
  content: "";
}

.page-faq .qa__q::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 29px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-amber);
  opacity: 0.55;
  transition:
    opacity 200ms var(--ease),
    box-shadow 240ms var(--ease);
}

.page-faq .qa__q:hover::before,
.page-faq .qa[open] > .qa__q::before {
  opacity: 1;
}

.page-faq .qa[open] > .qa__q::before {
  box-shadow: 0 0 0 5px rgba(255, 138, 60, 0.13);
}

.page-faq .qa__num {
  flex: none;
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--c-cyan);
  opacity: 0.85;
}

.page-faq .qa__title {
  font-size: 17px;
  font-weight: 600;
  line-height: 1.5;
  letter-spacing: -0.005em;
  color: inherit;
}

.page-faq .qa__mark {
  position: relative;
  flex: none;
  align-self: center;
  width: 12px;
  height: 12px;
  margin-left: auto;
  top: 1px;
}

.page-faq .qa__mark::before,
.page-faq .qa__mark::after {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 12px;
  height: 1px;
  background: var(--c-cold);
  transition:
    transform 220ms var(--ease),
    background-color 220ms var(--ease);
}

.page-faq .qa__mark::after {
  transform: rotate(90deg);
}

.page-faq .qa[open] .qa__mark::before,
.page-faq .qa[open] .qa__mark::after {
  background: var(--c-cyan);
}

.page-faq .qa[open] .qa__mark::after {
  transform: rotate(0deg);
}

.page-faq .qa__a {
  max-width: 66ch;
  padding: 0 10px 24px 28px;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--c-cold);
}

.page-faq .qa__a p {
  margin: 0;
}

/* --- 行内关键词与链接 --- */
.page-faq .ul {
  color: var(--c-mist);
  text-decoration: underline;
  text-decoration-color: var(--c-cyan);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.page-faq .faq-link {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(33, 230, 208, 0.35);
  transition: border-bottom-color 180ms var(--ease);
}

.page-faq .faq-link:hover,
.page-faq .faq-link:focus-visible {
  border-bottom-color: var(--c-cyan);
}

/* --- 插图 --- */
.page-faq .faq-figure {
  margin: 22px 0 clamp(26px, 4vw, 40px);
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  background: var(--c-midnight);
}

.page-faq .faq-figure figcaption {
  margin-top: 10px;
  padding-left: 12px;
  border-left: 1px solid var(--c-line);
  max-width: 58ch;
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-cold);
}

/* --- 窄屏：索引转为横向滑动条 --- */
@media (max-width: 879px) {
  .page-faq .faq-index__nav {
    flex-direction: row;
    overflow-x: auto;
    border-bottom: 1px solid var(--c-line);
    scrollbar-width: none;
  }

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

  .page-faq .faq-index__link {
    border-left: 0;
    border-bottom: 2px solid transparent;
    padding: 10px 16px;
    white-space: nowrap;
  }

  .page-faq .faq-index__link:hover,
  .page-faq .faq-index__link:focus-visible {
    border-left-color: transparent;
    border-bottom-color: var(--c-cyan);
  }

  .page-faq .faq-quota {
    max-width: 320px;
  }
}

/* --- 宽屏：左侧索引常驻 --- */
@media (min-width: 880px) {
  .page-faq .faq-body {
    grid-template-columns: 214px minmax(0, 1fr);
    gap: clamp(36px, 5vw, 76px);
  }

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

  .page-faq .faq-hero__lede {
    font-size: 19px;
  }
}

/* --- 大屏：条目留白拉开 --- */
@media (min-width: 1200px) {
  .page-faq .qa__q {
    padding: 22px 12px 22px 30px;
  }

  .page-faq .qa__q::before {
    top: 33px;
  }

  .page-faq .qa__a {
    padding: 0 12px 28px 30px;
    font-size: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq *,
  .page-faq *::before,
  .page-faq *::after {
    transition-duration: 0.01ms !important;
  }
}