/* ===== 常见问题页专属样式 ===== */
.page-faq {
  --faq-border-w: 2px;
  --faq-border: var(--faq-border-w) solid var(--navy);
  --faq-shadow: 4px 4px 0 rgba(11, 27, 58, 0.8);
  --faq-shadow-lift: 6px 6px 0 rgba(11, 27, 58, 0.9);
  --faq-gap: clamp(1.5rem, 4vw, 3rem);

  background: var(--blue-gray);
  color: var(--navy);
  line-height: 1.7;
}

/* ---- Hero 首屏 ---- */
.page-faq .faq-hero {
  position: relative;
  padding: 2.5rem var(--gutter) 3.5rem;
  background-color: var(--navy);
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 28px 28px;
  color: var(--white);
  border-bottom: 4px solid var(--orange);
  overflow: hidden;
}

.page-faq .faq-hero-inner {
  max-width: var(--container-max);
  margin-inline: auto;
  position: relative;
  z-index: 1;
}

.page-faq .faq-hero .breadcrumb-link,
.page-faq .faq-hero .breadcrumb-current {
  color: var(--silver);
}

.page-faq .faq-hero .breadcrumb-link:hover {
  color: var(--orange);
}

.page-faq .faq-hero-kicker {
  margin: 1.5rem 0 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-faq .faq-hero-title {
  margin: 0 0 1rem;
  max-width: 18ch;
  font-family: var(--font-heading);
  font-size: clamp(2rem, 6vw, 4rem);
  line-height: 1.05;
  text-wrap: balance;
}

.page-faq .faq-hero-lead {
  max-width: 60ch;
  margin: 0 0 2rem;
  font-size: clamp(1rem, 2vw, 1.125rem);
  color: var(--silver);
}

.page-faq .faq-quick-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  max-width: 40rem;
}

.page-faq .faq-quick-card {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.875rem 1rem;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.18);
  color: var(--white);
  text-decoration: none;
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.page-faq .faq-quick-card:hover,
.page-faq .faq-quick-card:focus-visible {
  background: rgba(255, 107, 0, 0.16);
  border-color: var(--orange);
  transform: translateY(-2px);
}

.page-faq .faq-quick-index {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--orange);
}

.page-faq .faq-quick-label {
  font-weight: 600;
}

.page-faq .faq-hero-key {
  display: inline-block;
  margin-top: 1.25rem;
  padding: 0.5rem 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--rock);
  border: 1px solid rgba(255, 255, 255, 0.14);
}

.page-faq .faq-hero-slant {
  display: block;
  position: absolute;
  right: 0;
  bottom: 0;
  width: 34%;
  height: 10px;
  background: var(--orange);
  transform: skewX(-24deg);
  transform-origin: right bottom;
}

/* ---- 章节通用 ---- */
.page-faq .faq-section {
  padding: clamp(2.5rem, 6vw, 4.5rem) var(--gutter);
}

.page-faq .faq-section--cream {
  background: var(--cream);
}

.page-faq .faq-section-head {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: clamp(1.5rem, 3vw, 2.5rem);
  padding-bottom: 1rem;
  border-bottom: var(--faq-border);
}

.page-faq .faq-section-index {
  flex-shrink: 0;
  padding: 0.4rem 0.7rem;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.25rem;
  line-height: 1;
  background: var(--orange);
  color: var(--white);
}

.page-faq .faq-section-head-text h2 {
  margin: 0 0 0.25rem;
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 4vw, 2.25rem);
  line-height: 1.2;
}

.page-faq .faq-section-head-text p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--rock);
}

/* ---- 布局：问题列表与辅助区 ---- */
.page-faq .faq-layout {
  display: grid;
  gap: var(--faq-gap);
  align-items: start;
}

.page-faq .faq-column-questions {
  display: grid;
  gap: 1.125rem;
}

/* ---- 折叠面板 ---- */
.page-faq .faq-item {
  background: var(--white);
  border: var(--faq-border);
  box-shadow: var(--faq-shadow);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.page-faq .faq-item[open] {
  border-color: var(--orange);
  box-shadow: var(--faq-shadow-lift);
}

.page-faq .faq-item summary {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  padding: 0.875rem 1rem;
  cursor: pointer;
  list-style: none;
  user-select: none;
}

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

.page-faq .faq-item summary::-moz-list-bullet {
  display: none;
}

.page-faq .faq-item summary::after {
  content: "+";
  margin-left: auto;
  font-size: 1.5rem;
  line-height: 1;
  font-weight: 700;
  color: var(--orange);
  transition: transform 0.2s ease;
}

.page-faq .faq-item[open] summary::after {
  content: "−";
}

.page-faq .faq-item[open] summary {
  border-bottom: 2px solid var(--navy);
}

.page-faq .faq-item-index {
  display: grid;
  place-items: center;
  flex-shrink: 0;
  width: 2.25rem;
  height: 2.25rem;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.85rem;
  background: var(--navy);
  color: var(--white);
  transition: background 0.2s ease;
}

.page-faq .faq-item[open] .faq-item-index {
  background: var(--orange);
}

.page-faq .faq-item-q {
  font-weight: 600;
  line-height: 1.4;
}

/* ---- 折叠展开内容（grid 0fr→1fr 动画） ---- */
.page-faq .faq-item-body {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.3s ease;
}

.page-faq .faq-item[open] .faq-item-body {
  grid-template-rows: 1fr;
}

.page-faq .faq-item-body-inner {
  min-height: 0;
  overflow: hidden;
  padding: 0 1rem 0 4.125rem;
}

.page-faq .faq-item[open] .faq-item-body-inner {
  padding: 0.875rem 1rem 1rem 4.125rem;
}

.page-faq .faq-item-body-inner > p {
  margin: 0 0 0.75rem;
  color: #3a4557;
}

.page-faq .faq-item-more {
  margin: 0.75rem 0 0;
  font-size: 0.9rem;
}

/* ---- 图片与说明 ---- */
.page-faq .faq-figure {
  margin: 0;
}

.page-faq .faq-figure .img-frame {
  box-shadow: var(--faq-shadow);
}

.page-faq .faq-figure figcaption {
  margin-top: 0.75rem;
  padding-left: 1rem;
  border-left: 3px solid var(--orange);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--rock);
}

/* ---- 侧边信息面板 ---- */
.page-faq .faq-aside {
  padding: 1.5rem;
  background: var(--white);
  border: var(--faq-border);
  box-shadow: var(--faq-shadow);
}

.page-faq .faq-aside h3 {
  margin: 0 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--navy);
  font-family: var(--font-heading);
  font-size: 1.125rem;
}

.page-faq .faq-steps {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: faq-step;
}

.page-faq .faq-steps li {
  position: relative;
  padding: 0.625rem 0 0.625rem 2.75rem;
  border-bottom: 1px dashed var(--silver);
  counter-increment: faq-step;
}

.page-faq .faq-steps li::before {
  content: counter(faq-step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0.625rem;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--orange);
}

.page-faq .faq-aside-note {
  margin: 1rem 0 0;
  font-size: 0.9rem;
  color: var(--rock);
}

.page-faq .faq-env-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-env-list li {
  position: relative;
  padding: 0.5rem 0 0.5rem 1.25rem;
  border-bottom: 1px dashed var(--silver);
}

.page-faq .faq-env-list li::before {
  content: "›";
  position: absolute;
  left: 0;
  font-weight: 700;
  color: var(--orange);
}

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

/* ---- 桌面端布局切换 ---- */
@media (min-width: 64rem) {
  .page-faq .faq-hero {
    padding: 4rem var(--gutter) 5rem;
  }

  .page-faq .faq-quick-grid {
    grid-template-columns: repeat(4, 1fr);
    max-width: none;
  }

  .page-faq .faq-hero-slant {
    width: 22%;
  }

  .page-faq .faq-layout {
    grid-template-columns: 7fr 5fr;
  }

  .page-faq .faq-layout--flip {
    grid-template-columns: 5fr 7fr;
  }

  .page-faq .faq-layout--flip > .faq-aside {
    position: sticky;
    top: 2rem;
  }
}