.page-faq {
  --faq-pad: clamp(32px, 5vw, 64px);
  background: var(--ink-950);
  color: var(--text-dark);
  font-family: var(--font-sans);
  line-height: var(--lh-body);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(20px, 3vw, 34px) 0 clamp(36px, 6vw, 68px);
  background: linear-gradient(158deg, var(--ink-900) 0%, var(--ink-950) 62%);
  border-bottom: 1px solid var(--ink-700);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  top: -32%;
  right: -16%;
  width: min(680px, 80vw);
  height: 158%;
  background: linear-gradient(148deg, rgba(47, 212, 196, 0.16) 0%, rgba(255, 106, 43, 0.09) 52%, transparent 74%);
  transform: rotate(13deg);
  pointer-events: none;
}

.page-faq .faq-hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 40px);
}

.page-faq .faq-crumb {
  grid-column: 1 / -1;
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: 0.05em;
}

.page-faq .faq-hero-text h1 {
  margin: 10px 0 14px;
  max-width: 15em;
  font-size: var(--fs-h1);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-faq .faq-lead {
  max-width: 34em;
  font-size: var(--fs-body);
  color: var(--text-muted);
}

.page-faq .faq-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.page-faq .faq-hero-facts {
  align-self: start;
  padding: 20px 22px;
  border-radius: var(--radius);
}

.page-faq .faq-hero-facts .eyebrow {
  margin-bottom: 10px;
}

.page-faq .fact-list {
  margin: 0;
  display: grid;
}

.page-faq .fact-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--ink-700);
}

.page-faq .fact-row:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-faq .fact-row dt {
  font-size: var(--fs-small);
  color: var(--slate);
}

.page-faq .fact-row dd {
  margin: 0;
  font-size: var(--fs-small);
  color: var(--text-dark);
}

.page-faq .fact-row dd.mono,
.page-faq .fact-row dd .mono {
  color: var(--sand);
  font-weight: 600;
}

/* ---------- 七节点快捷导航 ---------- */
.page-faq .faq-quick {
  position: relative;
  overflow: hidden;
  padding: var(--faq-pad) 0 calc(var(--faq-pad) + 34px);
  background-color: var(--ink-900);
  background-image: radial-gradient(rgba(143, 163, 184, 0.12) 1px, transparent 1px);
  background-size: 24px 24px;
}

.page-faq .faq-quick::after {
  content: "";
  position: absolute;
  inset: auto 0 -1px 0;
  height: clamp(28px, 5vw, 56px);
  background: var(--ink-950);
  clip-path: polygon(0 100%, 100% 0, 100% 100%);
  pointer-events: none;
}

.page-faq .quick-head {
  max-width: 46em;
  margin-bottom: 22px;
}

.page-faq .quick-head h2 {
  margin-bottom: 8px;
  font-size: var(--fs-h2);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-faq .quick-head p {
  font-size: var(--fs-small);
  color: var(--text-muted);
}

.page-faq .quick-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-faq .quick-cell {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
  padding: 14px 14px 16px;
  border: 1px solid var(--ink-700);
  border-radius: var(--radius-sm);
  background: var(--ink-800);
  text-decoration: none;
  color: inherit;
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-faq .quick-cell:hover,
.page-faq .quick-cell:focus-visible {
  transform: translateY(-2px);
  border-color: var(--teal);
  background: rgba(47, 212, 196, 0.1);
  outline: none;
}

.page-faq .quick-num {
  font-size: 20px;
  font-weight: 700;
  line-height: 1;
  color: var(--signal);
}

.page-faq .quick-name {
  font-size: 15px;
  font-weight: 700;
  color: var(--white);
}

.page-faq .quick-hint {
  font-size: 12px;
  line-height: 1.5;
  color: var(--slate);
}

.page-faq .quick-figure {
  position: relative;
  z-index: 1;
  max-width: 560px;
  margin: 28px 0 0;
  aspect-ratio: 5 / 4;
  overflow: hidden;
  border: 1px solid var(--ink-700);
  border-radius: var(--radius);
}

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

.page-faq .quick-figure .media-caption,
.page-faq .quick-figure figcaption {
  position: absolute;
  left: 12px;
  bottom: 10px;
  padding: 3px 10px;
  border-radius: 999px;
  background: rgba(10, 20, 32, 0.78);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--text-muted);
}

/* ---------- 答疑主体 ---------- */
.page-faq .faq-body {
  padding: var(--faq-pad) 0 calc(var(--faq-pad) * 1.15);
  background: var(--ink-950);
}

.page-faq .faq-body-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3vw, 44px);
  align-items: start;
}

.page-faq .faq-toc {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: thin;
}

.page-faq .faq-toc-title {
  display: none;
}

.page-faq .faq-toc-link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 12px;
  border: 1px solid var(--ink-700);
  border-radius: 999px;
  font-size: var(--fs-label);
  letter-spacing: 0.04em;
  color: var(--text-muted);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-faq .faq-toc-link .mono {
  color: var(--teal);
}

.page-faq .faq-toc-link:hover,
.page-faq .faq-toc-link:focus-visible {
  color: var(--white);
  border-color: var(--teal);
  background: rgba(47, 212, 196, 0.08);
  outline: none;
}

.page-faq .faq-group {
  margin-bottom: clamp(32px, 4vw, 56px);
  scroll-margin-top: 100px;
}

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

.page-faq .group-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 18px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--ink-700);
}

.page-faq .group-index {
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 700;
  line-height: 1;
  color: var(--sand);
}

.page-faq .group-head h2 {
  font-size: var(--fs-h2);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-faq .group-count {
  margin-left: auto;
  flex: 0 0 auto;
  padding: 2px 10px;
  border: 1px solid rgba(47, 212, 196, 0.35);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--teal);
}

.page-faq .group-figure {
  margin: 0 0 18px;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  border: 1px solid var(--ink-700);
  border-radius: var(--radius);
}

/* ---------- 可展开组 ---------- */
.page-faq .disclosure {
  margin-bottom: 10px;
  overflow: hidden;
  border: 1px solid var(--ink-700);
  border-radius: var(--radius-sm);
  background: var(--ink-900);
  scroll-margin-top: 110px;
  transition: border-color var(--dur) var(--ease);
}

.page-faq .disclosure[open] {
  border-color: rgba(47, 212, 196, 0.42);
}

.page-faq .disclosure > summary {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 15px 44px 15px 20px;
  list-style: none;
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.55;
  color: var(--white);
}

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

.page-faq .disclosure > summary::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  bottom: 12px;
  width: 3px;
  border-radius: 0 2px 2px 0;
  background: var(--ink-700);
  transition: background-color var(--dur) var(--ease);
}

.page-faq .disclosure[open] > summary::before {
  background: var(--teal);
}

.page-faq .disclosure > summary::after {
  content: "+";
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--teal);
}

.page-faq .disclosure[open] > summary::after {
  content: "−";
  color: var(--sand);
}

.page-faq .q-num {
  flex: 0 0 auto;
  padding-top: 2px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--teal);
}

.page-faq .q-title {
  min-width: 0;
}

.page-faq .disclosure-body {
  padding: 14px 20px 18px;
  border-top: 1px solid var(--ink-700);
  font-size: var(--fs-small);
  line-height: 1.78;
  color: var(--text-muted);
}

.page-faq .disclosure[open] .disclosure-body {
  animation: faqFade 0.22s var(--ease);
}

@keyframes faqFade {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.page-faq .disclosure-body p {
  margin: 0 0 10px;
}

.page-faq .disclosure-body p:last-child {
  margin-bottom: 0;
}

.page-faq .disclosure-body .mono {
  color: var(--sand);
}

.page-faq .hl {
  font-weight: 700;
  color: var(--teal);
}

.page-faq .chip {
  display: inline-block;
  margin: 0 4px 2px 0;
  padding: 1px 8px;
  border: 1px solid rgba(47, 212, 196, 0.4);
  border-radius: 999px;
  background: rgba(47, 212, 196, 0.1);
  font-size: 12px;
  line-height: 1.7;
  color: var(--teal);
  white-space: nowrap;
}

/* ---------- 联系渠道 ---------- */
.page-faq .help-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-bottom: 16px;
}

.page-faq .help-card {
  padding: 20px;
  border: 1px solid var(--ink-700);
  border-radius: var(--radius);
  background: var(--ink-900);
}

.page-faq .help-card .help-tag {
  margin-bottom: 8px;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--sand);
}

.page-faq .help-card h3 {
  margin-bottom: 8px;
  font-size: var(--fs-h3);
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-faq .help-card > p:not(.help-tag) {
  font-size: var(--fs-small);
  color: var(--text-muted);
}

.page-faq .contact-item {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed var(--ink-700);
}

.page-faq .contact-label {
  width: 100%;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--slate);
}

.page-faq .contact-value {
  font-size: var(--fs-small);
  color: var(--white);
  word-break: break-word;
}

.page-faq .copy-btn {
  margin-left: auto;
  padding: 4px 10px;
  border: 1px solid var(--ink-700);
  border-radius: 999px;
  background: transparent;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--teal);
  cursor: pointer;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-faq .copy-btn:hover,
.page-faq .copy-btn:focus-visible {
  border-color: var(--teal);
  color: var(--white);
  outline: none;
}

.page-faq .copy-btn[data-copied] {
  border-color: var(--teal);
  background: rgba(47, 212, 196, 0.12);
  color: var(--teal);
}

.page-faq .help-note {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 18px 20px;
  border: 1px solid rgba(217, 168, 92, 0.35);
  border-radius: var(--radius);
  background: rgba(217, 168, 92, 0.07);
}

.page-faq .help-note p {
  flex: 1 1 260px;
  margin: 0;
  font-size: var(--fs-small);
  line-height: 1.75;
  color: var(--text-muted);
}

.page-faq .faq-more {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin-top: clamp(28px, 4vw, 44px);
  padding-top: 20px;
  border-top: 1px solid var(--ink-700);
}

.page-faq .faq-more a {
  font-size: var(--fs-small);
  color: var(--teal);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-faq .faq-more a:hover,
.page-faq .faq-more a:focus-visible {
  color: var(--white);
  border-bottom-color: var(--teal);
  outline: none;
}

/* ---------- 响应式 ---------- */
@media (min-width: 600px) {
  .page-faq .quick-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-faq .help-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero-inner {
    grid-template-columns: minmax(0, 1.1fr) minmax(280px, 0.75fr);
    align-items: start;
  }

  .page-faq .quick-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-faq .help-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-faq .faq-body-grid {
    grid-template-columns: 210px minmax(0, 1fr);
    gap: clamp(32px, 4vw, 64px);
  }

  .page-faq .faq-aside {
    position: sticky;
    top: calc(var(--header-h-compact) + 28px);
  }

  .page-faq .faq-toc {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-toc-title {
    display: block;
    margin-bottom: 12px;
    font-family: var(--font-mono);
    font-size: var(--fs-label);
    letter-spacing: 0.1em;
    color: var(--slate);
  }

  .page-faq .faq-toc-link {
    display: flex;
    padding: 9px 0 9px 14px;
    border: 0;
    border-left: 2px solid var(--ink-700);
    border-radius: 0;
    font-size: var(--fs-small);
    white-space: normal;
  }

  .page-faq .faq-toc-link:hover,
  .page-faq .faq-toc-link:focus-visible {
    border-left-color: var(--teal);
    background: transparent;
  }
}

@media (min-width: 1100px) {
  .page-faq .quick-grid {
    grid-template-columns: repeat(7, minmax(0, 1fr));
  }

  .page-faq .quick-cell {
    padding: 14px 12px 16px;
  }

  .page-faq .quick-hint {
    font-size: 11px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .quick-cell,
  .page-faq .disclosure,
  .page-faq .faq-toc-link,
  .page-faq .copy-btn,
  .page-faq .faq-more a {
    transition: none;
  }

  .page-faq .quick-cell:hover,
  .page-faq .quick-cell:focus-visible {
    transform: none;
  }

  .page-faq .disclosure[open] .disclosure-body {
    animation: none;
  }
}