/* ============ 问答中心 · page-faq ============ */
.page-faq {
  --faq-rule: rgba(42, 65, 101, .2);
  --faq-rule-strong: rgba(42, 65, 101, .55);
  --faq-ink: #1B232E;
  --faq-body: #39424F;
}

/* ---------- 深色页头 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  background-color: var(--ink);
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 96px 96px;
  color: var(--text);
  padding: clamp(26px, 4vw, 48px) 0 clamp(36px, 6vw, 76px);
  border-bottom: 3px solid var(--signal);
}

.page-faq .faq-hero .breadcrumb {
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-faq .faq-title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(28px, 5vw, 46px);
  line-height: 1.26;
  letter-spacing: -.01em;
  color: var(--text-strong);
  margin: 16px 0 0;
  max-width: 22ch;
}

.page-faq .faq-lead {
  font-family: var(--font-sans);
  font-size: clamp(16px, 1.9vw, 18px);
  line-height: 1.8;
  color: var(--text);
  max-width: 62ch;
  margin: 20px 0 0;
}

.page-faq .faq-hero-stats {
  list-style: none;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--faq-rule-strong);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

@media (min-width: 720px) {
  .page-faq .faq-hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 24px;
  }
}

.page-faq .faq-hero-stats li {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-faq .stat-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(24px, 3vw, 32px);
  line-height: 1;
  color: var(--lime);
  letter-spacing: -.02em;
}

.page-faq .stat-cap {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--text-mute);
  line-height: 1.5;
}

/* ---------- 主体：目录 + 问答 ---------- */
.page-faq .faq-main {
  padding-top: clamp(36px, 5vw, 64px);
  padding-bottom: clamp(40px, 6vw, 80px);
}

.page-faq .faq-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
}

@media (min-width: 1000px) {
  .page-faq .faq-shell {
    grid-template-columns: 232px minmax(0, 1fr);
    gap: 64px;
    align-items: start;
  }
}

/* 左侧目录刻度 */
.page-faq .faq-toc {
  border-top: 3px solid var(--ink);
  padding-top: 16px;
}

@media (min-width: 1000px) {
  .page-faq .faq-toc {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }
}

.page-faq .faq-toc .toc-title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--stone);
  margin: 0 0 14px;
}

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

.page-faq .toc-link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 12px;
  border-left: 2px solid var(--faq-rule);
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.45;
  color: #4A5464;
  text-decoration: none;
  transition: color .18s var(--ease), border-color .18s var(--ease), background-color .18s var(--ease);
}

.page-faq .toc-link .n {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--stone);
  flex: none;
}

.page-faq .toc-link:hover {
  color: var(--ink-text);
  border-left-color: var(--signal);
  background: rgba(42, 65, 101, .06);
}

.page-faq .toc-link[aria-current="true"] {
  color: var(--ink-text);
  font-weight: 600;
  border-left-color: var(--signal);
  background: rgba(255, 106, 31, .1);
}

@media (max-width: 999px) {
  .page-faq .faq-toc .toc-list {
    grid-auto-flow: column;
    grid-auto-columns: max-content;
    gap: 0;
    overflow-x: auto;
    padding-bottom: 8px;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
  }

  .page-faq .toc-link {
    border-left: 2px solid transparent;
    border-bottom: 2px solid var(--faq-rule);
    white-space: nowrap;
  }

  .page-faq .toc-link:hover,
  .page-faq .toc-link[aria-current="true"] {
    border-left-color: transparent;
  }

  .page-faq .toc-link[aria-current="true"] {
    border-bottom-color: var(--signal);
  }
}

/* 筛选 chips */
.page-faq .faq-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 clamp(24px, 3vw, 36px);
}

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

/* ---------- 分组 ---------- */
.page-faq .faq-group {
  scroll-margin-top: calc(var(--header-h) + 24px);
  margin-bottom: clamp(36px, 5vw, 60px);
}

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

.page-faq .faq-group--after-band {
  padding-top: clamp(4px, 1vw, 12px);
}

.page-faq .faq-group-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--ink);
  margin-bottom: 4px;
}

.page-faq .faq-group-no {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--signal);
  flex: none;
}

.page-faq .faq-group-title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(21px, 2.6vw, 28px);
  line-height: 1.32;
  color: var(--faq-ink);
  margin: 0;
}

/* 图片 */
.page-faq .faq-flow {
  margin: 24px 0 10px;
}

.page-faq .faq-flow .figure-frame {
  border: 1px solid var(--faq-rule-strong);
  background: var(--ink);
  box-shadow: var(--shadow-hard-sm);
}

.page-faq .figure-frame img {
  display: block;
  max-width: 100%;
  object-fit: cover;
}

.page-faq .figure-frame--plain img {
  height: auto;
}

.page-faq .faq-flow figcaption,
.page-faq .faq-band figcaption {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--stone);
  margin-top: 10px;
}

/* ---------- 手风琴 ---------- */
.page-faq .accordion-item {
  border-bottom: 1px solid var(--faq-rule);
}

.page-faq .faq-q {
  margin: 0;
  font-size: inherit;
  font-weight: inherit;
}

.page-faq .accordion-trigger {
  width: 100%;
  display: flex;
  align-items: stretch;
  gap: 14px;
  margin: 0;
  padding: 17px 4px 17px 0;
  background: transparent;
  border: 0;
  text-align: left;
  cursor: pointer;
  font-family: var(--font-sans);
  font-size: 17px;
  font-weight: 600;
  line-height: 1.55;
  color: var(--faq-ink);
  transition: color .18s var(--ease);
}

.page-faq .accordion-trigger::before {
  content: "";
  flex: none;
  width: 3px;
  align-self: stretch;
  background: var(--line);
  transition: background-color .2s var(--ease);
}

.page-faq .accordion-trigger::after {
  content: "+";
  flex: none;
  align-self: center;
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--stone);
  transition: color .18s var(--ease);
}

.page-faq .accordion-trigger:hover {
  color: var(--signal);
}

.page-faq .accordion-trigger:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 3px;
}

.page-faq .accordion-item.is-open .accordion-trigger {
  color: var(--ink-text);
}

.page-faq .accordion-item.is-open .accordion-trigger::before {
  background: var(--signal);
}

.page-faq .accordion-item.is-open .accordion-trigger::after {
  content: "−";
  color: var(--signal);
}

.page-faq .accordion-panel {
  padding: 0 24px 22px 17px;
}

.page-faq .accordion-panel p {
  margin: 0;
  max-width: 68ch;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.82;
  color: var(--faq-body);
}

.page-faq .accordion-panel p + p {
  margin-top: 12px;
}

.page-faq .accordion-panel a {
  color: var(--signal);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .accordion-panel a:hover {
  color: var(--clay);
}

/* 关键数值反白 */
.page-faq .k {
  display: inline-block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: .94em;
  line-height: 1.5;
  padding: 1px 7px;
  background: var(--ink);
  color: var(--lime);
  border-radius: 2px;
  white-space: nowrap;
}

/* ---------- 中部分隔带 ---------- */
.page-faq .faq-band {
  background-color: var(--ink-2);
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 96px 96px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: clamp(40px, 6vw, 76px) 0;
}

.page-faq .faq-band-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  align-items: center;
}

@media (min-width: 900px) {
  .page-faq .faq-band-inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
  }
}

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

.page-faq .faq-band .figure-frame {
  border: 1px solid var(--line);
  box-shadow: var(--shadow-hard);
}

.page-faq .faq-band-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-faq .faq-band-list li {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding-bottom: 13px;
  border-bottom: 1px solid var(--line);
}

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

.page-faq .faq-band-list b {
  flex: none;
  min-width: 2.4em;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(22px, 2.6vw, 28px);
  line-height: 1;
  color: var(--lime);
}

.page-faq .faq-band-list span {
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.65;
  color: var(--text);
}

/* ---------- 结尾指引 ---------- */
.page-faq .faq-next {
  background: var(--ink);
  color: var(--text);
  padding: clamp(40px, 6vw, 72px) 0 clamp(48px, 7vw, 84px);
}

.page-faq .faq-next-label {
  color: var(--signal);
}

.page-faq .faq-next-title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(24px, 3.4vw, 34px);
  line-height: 1.3;
  color: var(--text-strong);
  margin: 14px 0 0;
}

.page-faq .faq-next-list {
  margin-top: clamp(24px, 3vw, 36px);
  border-top: 1px solid var(--line);
}

.page-faq .faq-next-list a {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 4px 12px;
  align-items: baseline;
  padding: 18px 4px;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  color: var(--text);
  transition: background-color .18s var(--ease), padding-left .18s var(--ease);
}

.page-faq .faq-next-list a:hover {
  background: rgba(255, 106, 31, .09);
  padding-left: 14px;
}

.page-faq .faq-next-list .n {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--signal);
}

.page-faq .faq-next-list .t {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(18px, 2vw, 20px);
  line-height: 1.4;
  color: var(--text-strong);
}

.page-faq .faq-next-list .d {
  grid-column: 2;
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.65;
  color: var(--text-mute);
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .toc-link,
  .page-faq .accordion-trigger,
  .page-faq .accordion-trigger::before,
  .page-faq .accordion-trigger::after,
  .page-faq .faq-next-list a {
    transition: none;
  }
}