.page-faq {
  --faq-gap: clamp(20px, 3vw, 40px);
  --faq-teal: #0B6B63;
  --faq-ink-soft: #3B564F;
}

/* ---------- 面包屑 ---------- */
.page-faq .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 24px 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--muted);
}

.page-faq .breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  transition: color .16s var(--ease);
}

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

/* ---------- 首屏框景 ---------- */
.page-faq .faq-hero {
  position: relative;
  border: 1px solid var(--rule);
  background:
    linear-gradient(160deg, rgba(16, 31, 58, .94) 0%, rgba(10, 38, 32, .96) 62%, var(--pitch) 100%);
  padding: clamp(24px, 4vw, 56px);
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  isolation: isolate;
}

.page-faq .faq-hero::before,
.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  width: 22px;
  height: 22px;
  pointer-events: none;
}

.page-faq .faq-hero::before {
  top: -1px;
  left: -1px;
  border-top: 2px solid var(--flame);
  border-left: 2px solid var(--flame);
}

.page-faq .faq-hero::after {
  bottom: -1px;
  right: -1px;
  border-bottom: 2px solid var(--electric);
  border-right: 2px solid var(--electric);
}

.page-faq .faq-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(28px, 5.2vw, 52px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--text);
  margin: 12px 0 18px;
  max-width: 22ch;
}

.page-faq .faq-hero__lead {
  color: var(--muted);
  font-size: 16px;
  line-height: 1.85;
  max-width: 60ch;
  margin: 0;
  border-left: 2px solid var(--rule);
  padding-left: 16px;
}

.page-faq .faq-hero__aside {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 18px;
  border-top: 1px solid var(--rule-soft);
  padding-top: 22px;
}

.page-faq .faq-hero__aside .kpi {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-faq .faq-hero__aside .kpi__value {
  font-family: var(--font-mono);
  font-size: 24px;
  font-variant-numeric: tabular-nums;
  color: var(--flame);
  line-height: 1.1;
}

.page-faq .faq-hero__aside .kpi__label {
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 场景筛选 ---------- */
.page-faq .faq-filter {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 26px 0 6px;
}

.page-faq .faq-filter .rule-label {
  margin-right: 6px;
}

.page-faq .faq-filter .btn {
  font-size: 13px;
}

.page-faq .faq-filter .btn[aria-pressed="true"] {
  background: var(--flame);
  border-color: var(--flame);
  color: var(--pitch-deep);
}

/* ---------- 主体布局 ---------- */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--faq-gap);
  padding-top: 28px;
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-faq .faq-toc {
  border-top: 1px solid var(--rule);
  padding-top: 14px;
}

.page-faq .faq-toc .rule-label {
  display: block;
  margin-bottom: 10px;
}

.page-faq .faq-toc .toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-faq .faq-toc .toc__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  white-space: nowrap;
  padding: 8px 12px;
  border: 1px solid var(--rule);
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
  transition: color .16s var(--ease), border-color .16s var(--ease), background .16s var(--ease);
}

.page-faq .faq-toc .toc__link:hover,
.page-faq .faq-toc .toc__link:focus-visible {
  color: var(--electric);
  border-color: var(--electric);
}

.page-faq .faq-toc .toc__link[aria-current="true"] {
  color: var(--text);
  border-color: var(--flame);
  background: rgba(255, 106, 26, .08);
}

.page-faq .toc__num {
  font-family: var(--font-mono);
  font-size: 11px;
  font-variant-numeric: tabular-nums;
  color: var(--rule);
}

.page-faq .faq-toc .toc__link[aria-current="true"] .toc__num {
  color: var(--flame);
}

/* ---------- 章节与问答条目 ---------- */
.page-faq .help-section {
  margin-bottom: clamp(40px, 6vw, 76px);
  scroll-margin-top: calc(var(--masthead-offset) + 16px);
}

.page-faq .help-section .section-head {
  border-bottom: 1px solid var(--rule);
  padding-bottom: 16px;
  margin-bottom: 24px;
}

.page-faq .help-section h2 {
  font-family: var(--font-display);
  font-size: clamp(22px, 3.4vw, 34px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--text);
  margin: 8px 0 10px;
  max-width: 26ch;
}

.page-faq .help-section .section-head p {
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
  max-width: 66ch;
  margin: 0;
}

.page-faq .qa-list {
  display: block;
}

.page-faq .qa {
  position: relative;
  border-bottom: 1px solid var(--rule-soft);
}

.page-faq .qa::before {
  content: "";
  position: absolute;
  left: -14px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--flame);
  opacity: 0;
  transition: opacity .16s var(--ease);
}

.page-faq .qa[open]::before {
  opacity: 1;
}

.page-faq .qa__summary {
  list-style: none;
  cursor: pointer;
  position: relative;
  padding: 18px 48px 18px 0;
  font-size: 16px;
  line-height: 1.55;
  font-weight: 600;
  color: var(--text);
  transition: color .16s var(--ease);
}

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

.page-faq .qa__summary:hover,
.page-faq .qa__summary:focus-visible {
  color: var(--electric);
}

.page-faq .qa__summary:focus-visible {
  outline: 2px solid var(--electric);
  outline-offset: 3px;
}

.page-faq .qa__arrow {
  position: absolute;
  right: 14px;
  top: 24px;
  width: 10px;
  height: 10px;
  border-right: 1.5px solid var(--rule);
  border-bottom: 1.5px solid var(--rule);
  transform: rotate(45deg);
  transition: transform .2s var(--ease), border-color .16s var(--ease);
}

.page-faq .qa[open] .qa__arrow {
  transform: rotate(-135deg);
  border-color: var(--flame);
}

.page-faq .qa__body {
  padding: 2px 0 22px;
}

.page-faq .qa__how,
.page-faq .qa__expect {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  text-transform: uppercase;
  margin: 14px 0 10px;
  padding-left: 12px;
  border-left: 2px solid var(--electric);
  color: var(--electric);
}

.page-faq .qa__expect {
  border-left-color: var(--muted);
  color: var(--muted);
}

.page-faq .qa__body p {
  font-size: 15px;
  line-height: 1.82;
  color: var(--text);
  margin: 0 0 10px;
  max-width: 74ch;
}

.page-faq .steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-faq .steps li {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text);
}

.page-faq .steps__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border: 1px solid var(--rule);
  font-family: var(--font-mono);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  color: var(--flame);
}

/* ---------- 双极色条示意 ---------- */
.page-faq .bipolar {
  display: flex;
  height: 12px;
  width: 100%;
  max-width: 420px;
  margin: 6px 0 14px;
  border: 1px solid var(--rule);
  overflow: hidden;
}

.page-faq .bipolar__seg {
  display: block;
  height: 100%;
}

.page-faq .bipolar__seg--attack {
  background: linear-gradient(90deg, rgba(229, 72, 63, .35), var(--warm));
}

.page-faq .bipolar__seg--defend {
  background: linear-gradient(90deg, var(--cold), rgba(60, 141, 255, .35));
}

/* ---------- 浅色投屏区 ---------- */
.page-faq .help-section--paper {
  background: var(--paper);
  border: 1px solid var(--rule);
  padding: clamp(22px, 4vw, 44px);
}

.page-faq .help-section--paper .section-head {
  border-bottom-color: rgba(10, 38, 32, .2);
}

.page-faq .help-section--paper h2 {
  color: var(--ink);
}

.page-faq .help-section--paper .section-head p {
  color: var(--faq-ink-soft);
}

.page-faq .help-section--paper .qa {
  border-bottom-color: rgba(10, 38, 32, .18);
}

.page-faq .help-section--paper .qa__summary {
  color: var(--ink);
}

.page-faq .help-section--paper .qa__summary:hover,
.page-faq .help-section--paper .qa__summary:focus-visible {
  color: var(--faq-teal);
}

.page-faq .help-section--paper .qa__arrow {
  border-color: rgba(10, 38, 32, .5);
}

.page-faq .help-section--paper .qa[open] .qa__arrow {
  border-color: var(--flame);
}

.page-faq .help-section--paper .qa__how {
  color: var(--faq-teal);
  border-left-color: var(--faq-teal);
}

.page-faq .help-section--paper .qa__expect {
  color: #5C7770;
  border-left-color: #5C7770;
}

.page-faq .help-section--paper .qa__body p,
.page-faq .help-section--paper .steps li {
  color: var(--ink);
}

.page-faq .help-section--paper .steps__num {
  border-color: rgba(10, 38, 32, .35);
  color: var(--faq-teal);
}

.page-faq .cast-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
}

.page-faq .cast-grid .media-frame__caption {
  color: var(--faq-ink-soft);
}

/* ---------- 横向提示条 ---------- */
.page-faq .promo-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px 22px;
  border: 1px solid var(--rule);
  border-left: 3px solid var(--electric);
  background: var(--slate);
  padding: 18px 22px;
  margin: -18px 0 clamp(40px, 6vw, 76px);
}

.page-faq .promo-bar__text {
  flex: 1 1 320px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
  margin: 0;
}

.page-faq .promo-bar .btn {
  flex: 0 0 auto;
}

/* ---------- 浅色表格区 ---------- */
.page-faq .qa__body .surface-light {
  margin: 4px 0 12px;
}

.page-faq .qa__body .data-table td,
.page-faq .qa__body .data-table th {
  font-size: 14px;
}

/* ---------- 联系面板 ---------- */
.page-faq .contact-panel {
  border: 1px solid var(--rule);
  border-top: 2px solid var(--flame);
  background: var(--deep);
  padding: clamp(20px, 3.4vw, 34px);
  display: grid;
  gap: 16px;
}

.page-faq .contact-panel .contact-line {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--rule-soft);
}

.page-faq .contact-panel .contact-line__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--muted);
}

.page-faq .contact-panel .contact-line__value {
  font-family: var(--font-mono);
  font-size: 15px;
  word-break: break-all;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

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

.page-faq .contact-panel__note {
  font-size: 13px;
  line-height: 1.8;
  color: var(--muted);
  margin: 0;
  padding-left: 12px;
  border-left: 2px solid var(--amber);
}

/* ---------- 桌面端 ---------- */
@media (min-width: 900px) {
  .page-faq .faq-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
    gap: 44px;
  }

  .page-faq .faq-hero__aside {
    grid-template-columns: 1fr;
    gap: 22px;
    border-top: 0;
    border-left: 1px solid var(--rule);
    padding-top: 0;
    padding-left: 30px;
  }

  .page-faq .cast-grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    gap: 34px;
    align-items: start;
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-layout {
    grid-template-columns: 224px minmax(0, 1fr);
    gap: 52px;
  }

  .page-faq .faq-toc {
    border-top: 0;
    border-left: 1px solid var(--rule);
    padding-top: 0;
    padding-left: 18px;
    position: sticky;
    top: calc(var(--masthead-offset) + 20px);
    align-self: start;
  }

  .page-faq .faq-toc .toc__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
  }

  .page-faq .faq-toc .toc__link {
    border: 0;
    border-left: 2px solid transparent;
    padding: 9px 10px;
    white-space: normal;
  }

  .page-faq .faq-toc .toc__link[aria-current="true"] {
    background: transparent;
    border-left-color: var(--flame);
  }

  .page-faq .help-section h2 {
    max-width: 32ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa__arrow,
  .page-faq .qa,
  .page-faq .qa::before,
  .page-faq .qa__summary,
  .page-faq .faq-toc .toc__link,
  .page-faq .breadcrumb a {
    transition: none;
  }
}