.page-faq {
  background: var(--color-base);
  color: var(--color-ink);
}

/* ===== Hero 区 ===== */
.page-faq .faq-hero {
  position: relative;
  padding-top: calc(var(--header-height) + var(--space-5));
  padding-bottom: var(--space-6);
  overflow: hidden;
  border-bottom: 1px solid var(--color-line);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(45, 70, 89, .28) 1px, transparent 1px),
    linear-gradient(90deg, rgba(45, 70, 89, .28) 1px, transparent 1px);
  background-size: 40px 40px;
  -webkit-mask-image: radial-gradient(ellipse at 72% 28%, #000 0%, transparent 72%);
  mask-image: radial-gradient(ellipse at 72% 28%, #000 0%, transparent 72%);
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  right: -80px;
  top: -80px;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 107, 53, .16), transparent 70%);
  pointer-events: none;
}

.page-faq .faq-breadcrumb-sep {
  color: var(--color-line);
  font-family: var(--font-mono);
  margin: 0 var(--space-1);
}

.page-faq .faq-hero-grid {
  position: relative;
  display: grid;
  gap: var(--space-4);
}

.page-faq .faq-hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .18em;
  color: var(--color-orange);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-pill);
  padding: var(--space-1) var(--space-3);
  margin-bottom: var(--space-3);
}

.page-faq .faq-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.25rem);
  line-height: 1.08;
  letter-spacing: .01em;
  margin: 0 0 var(--space-3);
  position: relative;
}

.page-faq .faq-hero .lead {
  color: var(--color-muted);
  font-size: 1rem;
  line-height: 1.8;
  max-width: 46em;
  margin: 0;
}

.page-faq .faq-hero-metrics {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  position: relative;
}

.page-faq .faq-stat {
  background: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  padding: var(--space-3) var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  min-width: 128px;
}

.page-faq .faq-stat-value {
  font-family: var(--font-mono);
  font-size: 1.875rem;
  color: var(--color-orange);
  line-height: 1;
  display: block;
}

.page-faq .faq-stat-label {
  font-size: .75rem;
  color: var(--color-muted);
}

.page-faq .faq-hero-strip {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-4);
  margin-top: var(--space-4);
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-line);
  position: relative;
}

.page-faq .faq-hero-strip span {
  font-family: var(--font-mono);
  font-size: .75rem;
  color: var(--color-muted);
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
}

.page-faq .faq-hero-strip span::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-lime);
  flex: none;
}

/* ===== 主布局 ===== */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
  padding-top: var(--space-6);
  padding-bottom: var(--space-7);
}

/* ===== 侧边栏索引 ===== */
.page-faq .faq-index {
  display: flex;
  flex-wrap: nowrap;
  gap: var(--space-2);
  overflow-x: auto;
  scrollbar-width: none;
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--color-line);
}

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

.page-faq .faq-index-label {
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .1em;
  color: var(--color-orange);
  margin-right: var(--space-1);
}

.page-faq .faq-index-link {
  flex: 0 0 auto;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-pill);
  background: var(--color-card);
  border: 1px solid var(--color-line);
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: .8125rem;
  text-decoration: none;
  transition: background-color .3s var(--ease), color .3s var(--ease), border-color .3s var(--ease);
}

.page-faq .faq-index-link:hover,
.page-faq .faq-index-link:focus-visible {
  background: var(--color-card-hover);
  color: var(--color-ink);
  border-color: var(--color-lime);
}

/* ===== 分类区块 ===== */
.page-faq .faq-category {
  scroll-margin-top: calc(var(--header-height) + var(--space-3));
}

.page-faq .faq-category + .faq-category {
  margin-top: var(--space-6);
  position: relative;
}

.page-faq .faq-category + .faq-category::before {
  content: "";
  display: block;
  height: 2px;
  background: linear-gradient(90deg, transparent, rgba(255, 107, 53, .55), rgba(198, 255, 0, .45), transparent);
  border-radius: 2px;
  margin-bottom: var(--space-6);
}

.page-faq .category-head {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.page-faq .category-head .chapter-no {
  font-family: var(--font-display);
  font-size: 2rem;
  color: var(--color-orange);
  line-height: 1;
}

.page-faq .category-head h2 {
  font-family: var(--font-display);
  font-size: 1.375rem;
  color: var(--color-ink);
  margin: 0 0 var(--space-1);
  letter-spacing: .01em;
}

.page-faq .category-head p {
  color: var(--color-muted);
  font-size: .875rem;
  line-height: 1.6;
  margin: 0;
}

/* ===== 图片框架 ===== */
.page-faq .faq-figure {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-card);
  border: 1px solid var(--color-line);
  margin: 0 0 var(--space-4);
}

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

.page-faq .faq-figure figcaption {
  font-family: var(--font-serif);
  font-size: .875rem;
  color: var(--color-muted);
  padding: var(--space-2) var(--space-3);
  border-top: 1px solid var(--color-line);
  line-height: 1.6;
}

/* ===== 折叠面板 ===== */
.page-faq .faq-panel {
  background: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-3);
  overflow: hidden;
  transition: background-color .3s var(--ease), border-color .3s var(--ease);
}

.page-faq .faq-panel[open] {
  border-color: rgba(198, 255, 0, .4);
}

.page-faq .faq-panel summary {
  list-style: none;
  cursor: pointer;
  padding: var(--space-4) var(--space-4) var(--space-4) var(--space-5);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  font-family: var(--font-display);
  font-size: 1.0625rem;
  line-height: 1.5;
  color: var(--color-ink);
  position: relative;
  user-select: none;
}

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

.page-faq .faq-panel summary::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 24px;
  border-radius: 0 2px 2px 0;
  background: var(--color-lime);
  opacity: 0;
  transition: opacity .3s var(--ease);
}

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

.page-faq .faq-panel summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1.5rem;
  line-height: 1;
  color: var(--color-orange);
  flex: none;
  transition: transform .3s var(--ease), color .3s var(--ease);
}

.page-faq .faq-panel[open] summary::after {
  transform: rotate(45deg);
  color: var(--color-lime);
}

.page-faq .faq-answer {
  border-top: 1px dashed var(--color-line);
  padding: 0 var(--space-4) var(--space-4) var(--space-5);
}

.page-faq .faq-answer > p {
  padding-top: var(--space-3);
  color: var(--color-muted);
  font-size: .9375rem;
  line-height: 1.85;
  margin: 0;
}

.page-faq .faq-answer a {
  color: var(--color-lime);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color .3s var(--ease);
}

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

/* ===== 数据说明卡 ===== */
.page-faq .faq-data-snippet {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-3);
  padding: var(--space-2) var(--space-3);
  background: rgba(255, 255, 255, .045);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: .75rem;
  color: var(--color-muted);
  transition: background-color .3s var(--ease), border-color .3s var(--ease);
}

.page-faq .faq-data-snippet b {
  color: var(--color-ink);
  font-weight: 700;
}

.page-faq .faq-data-snippet .snippet-note {
  flex: 1 1 100%;
  font-family: var(--font-body);
  font-size: .8125rem;
  color: var(--color-muted);
  line-height: 1.6;
}

.page-faq .faq-data-snippet .tag {
  font-family: var(--font-body);
}

/* ===== 联系区块 ===== */
.page-faq .faq-contact-card {
  margin-top: var(--space-4);
  background: var(--color-deep);
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-line);
  padding: var(--space-5);
  position: relative;
  overflow: hidden;
  transition: border-color .3s var(--ease);
}

.page-faq .faq-contact-card:hover,
.page-faq .faq-contact-card:focus-within {
  border-color: rgba(255, 107, 53, .4);
}

.page-faq .faq-contact-card::before {
  content: "";
  position: absolute;
  right: -60px;
  top: -60px;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(198, 255, 0, .14), transparent 70%);
  pointer-events: none;
}

.page-faq .faq-contact-card::after {
  content: "";
  position: absolute;
  left: -40px;
  bottom: -80px;
  width: 160px;
  height: 160px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 107, 53, .12), transparent 70%);
  pointer-events: none;
}

.page-faq .faq-contact-card-inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: var(--space-3);
}

.page-faq .faq-contact-card .chapter-no {
  color: var(--color-orange);
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .2em;
}

.page-faq .faq-contact-card h3 {
  margin: var(--space-1) 0 var(--space-2);
  font-family: var(--font-display);
  font-size: 1.25rem;
}

.page-faq .faq-contact-card p {
  color: var(--color-muted);
  font-size: .875rem;
  line-height: 1.8;
  margin: 0;
}

.page-faq .faq-email-link {
  display: inline-flex;
  align-items: center;
  justify-self: start;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: var(--color-orange);
  color: #0d1b26;
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: .875rem;
  font-weight: 700;
  text-decoration: none;
  transition: background-color .3s var(--ease), transform .3s var(--ease), box-shadow .3s var(--ease);
}

.page-faq .faq-email-link:hover,
.page-faq .faq-email-link:focus-visible {
  background: var(--color-lime);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(198, 255, 0, .2);
}

/* ===== 平板增强 ===== */
@media (min-width: 48rem) {
  .page-faq .faq-hero-grid {
    grid-template-columns: 1fr auto;
    align-items: end;
    gap: var(--space-5);
  }

  .page-faq .faq-hero-metrics {
    flex-direction: column;
    gap: var(--space-2);
  }

  .page-faq .faq-stat {
    min-width: 160px;
  }

  .page-faq .faq-stat-value {
    font-size: 2.25rem;
  }

  .page-faq .faq-hero-strip {
    margin-top: var(--space-5);
  }
}

/* ===== 桌面端两栏布局 ===== */
@media (min-width: 62rem) {
  .page-faq .faq-layout {
    grid-template-columns: 220px minmax(0, 1fr);
    gap: var(--space-6);
    align-items: start;
  }

  .page-faq .faq-index {
    flex-direction: column;
    gap: var(--space-2);
    overflow: visible;
    border: 0;
    padding: 0;
    position: sticky;
    top: calc(var(--header-height) + var(--space-4));
  }

  .page-faq .faq-index-label {
    writing-mode: horizontal-tb;
    margin: 0 0 var(--space-1) var(--space-2);
  }

  .page-faq .faq-index-link {
    width: 100%;
    font-size: .875rem;
  }

  .page-faq .faq-category + .faq-category {
    margin-top: var(--space-7);
  }

  .page-faq .faq-category + .faq-category::before {
    margin-bottom: var(--space-7);
  }

  .page-faq .faq-data-snippet .snippet-note {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height .35s var(--ease), opacity .35s var(--ease);
  }

  .page-faq .faq-data-snippet:hover .snippet-note,
  .page-faq .faq-data-snippet:focus-within .snippet-note {
    max-height: 5em;
    opacity: 1;
  }

  .page-faq .faq-contact-card-inner {
    grid-template-columns: 1fr auto;
    align-items: center;
  }
}

/* ===== 减少动态偏好 ===== */
@media (prefers-reduced-motion: reduce) {
  .page-faq *,
  .page-faq *::before,
  .page-faq *::after {
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
    scroll-behavior: auto !important;
  }
}