.page-faq {
  --faq-rule: 1px solid var(--ember-700);
  --faq-toc-w: 16rem;
  --faq-key-bg: rgba(23, 179, 201, 0.14);
  background: var(--ember-900);
  color: var(--chalk-100);
  font-family: var(--font-body);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  padding: clamp(28px, 5vw, 48px) 0 clamp(32px, 5vw, 60px);
  border-bottom: var(--faq-rule);
  background:
    radial-gradient(120% 120% at 88% 0%, rgba(232, 68, 42, 0.16) 0%, rgba(20, 16, 14, 0) 58%),
    var(--ember-900);
}

.page-faq .faq-crumb {
  margin-bottom: clamp(20px, 3vw, 32px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--text-faint);
}

.page-faq .faq-crumb a {
  color: var(--cyber-300);
  text-decoration: none;
}

.page-faq .faq-crumb a:hover,
.page-faq .faq-crumb a:focus-visible {
  color: var(--flame-400);
  outline: none;
}

.page-faq .faq-hero-grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
}

.page-faq .faq-hero-copy h1 {
  margin: 12px 0 18px;
  font-family: var(--font-head);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.08;
  font-size: clamp(2rem, 6.2vw, 3.6rem);
  max-width: 18em;
}

.page-faq .faq-hero-copy .lede {
  max-width: 40em;
  color: var(--text-soft);
}

.page-faq .faq-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--text-faint);
}

.page-faq .faq-hero-meta .num {
  color: var(--flame-400);
  font-size: 14px;
}

.page-faq .faq-hero-media {
  margin: 0;
  transform: rotate(-1.4deg);
  border: var(--faq-rule);
  background: var(--ember-800);
  box-shadow: var(--shadow-lift);
}

/* ---------- 主题筛选条 ---------- */
.page-faq .faq-toolbar {
  border-bottom: var(--faq-rule);
  background: var(--ember-800);
}

.page-faq .faq-toolbar-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 20px;
  padding-top: 14px;
  padding-bottom: 14px;
}

.page-faq .faq-toolbar .filter-bar {
  display: flex;
  flex-wrap: nowrap;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 2px;
  scrollbar-width: thin;
  max-width: 100%;
}

.page-faq .faq-toolbar .filter-btn {
  flex: 0 0 auto;
  white-space: nowrap;
}

.page-faq .faq-toolbar .filter-btn .num {
  margin-right: 6px;
  opacity: 0.72;
  font-size: 11px;
}

.page-faq .faq-status {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--text-faint);
  white-space: nowrap;
}

/* ---------- 目录 + 分组布局 ---------- */
.page-faq .faq-layout {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  padding-top: clamp(28px, 4vw, 52px);
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-faq .faq-toc-title {
  margin: 0 0 12px;
}

.page-faq .faq-toc-list {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  scrollbar-width: thin;
}

.page-faq .faq-toc-list li {
  flex: 0 0 auto;
}

.page-faq .faq-toc-list a {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: var(--faq-rule);
  color: var(--text-soft);
  font-size: 14px;
  text-decoration: none;
  white-space: nowrap;
  transition: color 160ms var(--ease), border-color 160ms var(--ease), background 160ms var(--ease);
}

.page-faq .faq-toc-list a .num {
  color: var(--cyber-300);
  font-size: 12px;
}

.page-faq .faq-toc-list a:hover,
.page-faq .faq-toc-list a:focus-visible {
  border-color: var(--flame-600);
  background: rgba(232, 68, 42, 0.1);
  color: var(--chalk-100);
  outline: none;
}

.page-faq .faq-toc-list a:hover .num,
.page-faq .faq-toc-list a:focus-visible .num {
  color: var(--flame-400);
}

.page-faq .faq-toc-foot {
  margin: 14px 0 0;
  font-size: 13px;
  color: var(--text-faint);
}

.page-faq .faq-toc-foot a {
  color: var(--cyber-300);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

.page-faq .faq-toc-foot a:hover,
.page-faq .faq-toc-foot a:focus-visible {
  color: var(--flame-400);
  outline: none;
}

/* ---------- 分组 ---------- */
.page-faq [data-filter-item][data-hidden] {
  display: none;
}

.page-faq .faq-groups {
  display: flex;
  flex-direction: column;
  gap: clamp(20px, 3vw, 32px);
  min-width: 0;
}

.page-faq .faq-group {
  padding: clamp(18px, 3vw, 28px);
  border: var(--faq-rule);
  background: var(--ember-800);
  scroll-margin-top: 100px;
}

.page-faq .faq-group-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 14px;
  border-bottom: var(--faq-rule);
}

.page-faq .faq-code {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--flame-600);
}

.page-faq .faq-group-head .h-sub {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  letter-spacing: -0.01em;
}

/* ---------- 折叠问答 ---------- */
.page-faq .faq-item {
  border-bottom: var(--faq-rule);
}

.page-faq .faq-item:last-of-type {
  border-bottom: 0;
}

.page-faq .faq-item summary {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 18px 0;
  cursor: pointer;
  font-size: clamp(15px, 1.6vw, 17px);
  font-weight: 600;
  line-height: 1.6;
  color: var(--chalk-100);
  list-style: none;
  transition: color 160ms var(--ease);
}

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

.page-faq .faq-item summary::before {
  content: "+";
  flex: 0 0 auto;
  width: 1.1em;
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1.6;
  color: var(--flame-600);
}

.page-faq .faq-item[open] summary::before {
  content: "−";
  color: var(--cyber-300);
}

.page-faq .faq-item summary:hover,
.page-faq .faq-item summary:focus-visible {
  color: var(--flame-400);
  outline: none;
}

.page-faq .faq-item[open] summary {
  padding-bottom: 8px;
}

.page-faq .faq-answer {
  padding: 0 0 20px 2.4em;
  max-width: 42em;
}

.page-faq .faq-answer p {
  margin: 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--text-soft);
}

.page-faq .key-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.95em;
  padding: 0 4px;
  border-radius: 2px;
  background: var(--faq-key-bg);
  color: var(--cyber-300);
}

/* ---------- 组内配图 ---------- */
.page-faq .faq-figure {
  margin: 22px 0 4px;
  border: var(--faq-rule);
  background: var(--ember-900);
}

/* ---------- 收束 ---------- */
.page-faq .faq-closing {
  border-top: var(--faq-rule);
}

.page-faq .faq-closing-inner {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-faq .faq-closing-copy .lede {
  max-width: 40em;
  color: var(--text-soft);
}

.page-faq .faq-closing-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(18px, 3vw, 26px);
}

.page-faq .faq-closing-links {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: var(--faq-rule);
}

.page-faq .faq-closing-links li {
  border-bottom: var(--faq-rule);
}

.page-faq .faq-closing-links a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 2px;
  color: var(--text-soft);
  font-size: 15px;
  text-decoration: none;
  transition: color 160ms var(--ease), padding-left 160ms var(--ease);
}

.page-faq .faq-closing-links a::after {
  content: "→";
  font-family: var(--font-mono);
  color: var(--cyber-500);
}

.page-faq .faq-closing-links a:hover,
.page-faq .faq-closing-links a:focus-visible {
  color: var(--chalk-100);
  padding-left: 8px;
  outline: none;
}

.page-faq .faq-closing-links a:hover::after,
.page-faq .faq-closing-links a:focus-visible::after {
  color: var(--flame-400);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-faq .faq-hero-grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
  }
}

@media (min-width: 960px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-toc-w) minmax(0, 1fr);
  }

  .page-faq .faq-toc {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-faq .faq-toc-list {
    display: block;
    overflow: visible;
    padding: 0;
    border-left: var(--faq-rule);
  }

  .page-faq .faq-toc-list li {
    flex: initial;
  }

  .page-faq .faq-toc-list a {
    border: 0;
    border-left: 2px solid transparent;
    margin-left: -1px;
    padding: 10px 4px 10px 16px;
    background: transparent;
    transition: color 160ms var(--ease), border-color 160ms var(--ease);
  }

  .page-faq .faq-toc-list a:hover,
  .page-faq .faq-toc-list a:focus-visible {
    border-left-color: var(--flame-600);
    background: transparent;
  }

  .page-faq .faq-closing-inner {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }

  .page-faq .faq-closing-links {
    border-top: 0;
    padding-top: 6px;
  }

  .page-faq .faq-closing-links li:first-child {
    border-top: var(--faq-rule);
  }
}

@media (max-width: 699px) {
  .page-faq .faq-hero-media {
    transform: none;
  }

  .page-faq .faq-answer {
    padding-left: 2.1em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item summary,
  .page-faq .faq-toc-list a,
  .page-faq .faq-closing-links a {
    transition: none;
  }
}