.page-faq {
  --faq-rail-top: 6.5rem;
  --faq-grid-line: rgba(140, 163, 184, 0.12);
}

/* 面包屑底衬 */
.page-faq .breadcrumb {
  padding-block: 1rem 0;
}

/* 首屏 */
.page-faq .faq-hero {
  position: relative;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(115% 85% at 8% 0%, rgba(34, 211, 238, 0.16), transparent 62%),
    radial-gradient(90% 70% at 100% 100%, rgba(226, 58, 46, 0.14), transparent 60%),
    linear-gradient(180deg, var(--space-800), var(--space-900));
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(90deg, var(--faq-grid-line) 0 1px, transparent 1px 76px),
    repeating-linear-gradient(0deg, var(--faq-grid-line) 0 1px, transparent 1px 76px);
  opacity: 0.75;
  pointer-events: none;
}

.page-faq .faq-hero__inner {
  position: relative;
  display: grid;
  gap: 2rem;
  padding-block: 2.5rem 3rem;
}

.page-faq .faq-hero__text h1 {
  font-family: var(--font-head);
  font-weight: 400;
  font-size: clamp(2.05rem, 6vw, 3.6rem);
  line-height: 1.04;
  letter-spacing: 0.01em;
  color: var(--paper);
  margin: 0.6rem 0 1rem;
  max-width: 22ch;
}

.page-faq .faq-hero__lead {
  max-width: 62ch;
  color: var(--body-text);
  font-size: 1.02rem;
  line-height: 1.8;
  margin: 0 0 1.5rem;
}

.page-faq .faq-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.85rem;
  color: var(--mist);
}

.page-faq .faq-hero__meta li {
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
}

.page-faq .faq-hero__meta .num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--orange);
  letter-spacing: -0.02em;
}

.page-faq .faq-hero__media {
  margin: 0;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--midnight);
  box-shadow: 0 24px 60px -32px rgba(0, 0, 0, 0.8);
}

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

.page-faq .faq-hero__media .media__tag {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
}

/* 文档式三栏布局 */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2rem;
  padding-block: 2.5rem 4rem;
  align-items: start;
}

/* 左侧分类索引 */
.page-faq .faq-index__list {
  list-style: none;
  margin: 0.5rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.3rem;
}

.page-faq .faq-index__list a {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  padding: 0.55rem 0.75rem;
  border-left: 2px solid var(--line);
  color: var(--mist);
  text-decoration: none;
  font-size: 0.9rem;
  line-height: 1.4;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease),
    background-color var(--dur) var(--ease);
}

.page-faq .faq-index__list a:hover,
.page-faq .faq-index__list a:focus-visible {
  border-left-color: var(--orange);
  color: var(--paper);
  background: rgba(14, 42, 74, 0.7);
}

.page-faq .faq-index__list .idx {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--pulse);
}

.page-faq .faq-index__hint {
  margin: 1rem 0 0;
  padding-left: 0.75rem;
  font-size: 0.78rem;
  line-height: 1.7;
  color: var(--mist);
  border-left: 2px solid var(--line-soft);
}

/* 问答分组 */
.page-faq .faq-group {
  scroll-margin-top: 7rem;
  padding-bottom: 2.5rem;
  margin-bottom: 2.5rem;
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .faq-group:last-child {
  border-bottom: 0;
  margin-bottom: 0;
  padding-bottom: 0.5rem;
}

.page-faq .faq-group__head {
  position: relative;
  padding-left: 0.9rem;
  margin-bottom: 1.25rem;
  border-left: 3px solid var(--orange);
}

.page-faq .faq-group__head .idx {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-faq .faq-group__head h2 {
  font-family: var(--font-head);
  font-weight: 400;
  font-size: clamp(1.45rem, 3.6vw, 2.15rem);
  line-height: 1.15;
  color: var(--paper);
  margin: 0.25rem 0 0.5rem;
}

.page-faq .faq-group__head p {
  margin: 0;
  max-width: 66ch;
  color: var(--mist);
  font-size: 0.92rem;
  line-height: 1.75;
}

/* 分组配图 */
.page-faq .faq-figure {
  margin: 1.25rem 0 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--midnight);
}

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

.page-faq .faq-figure .media__tag {
  background: var(--teal);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
}

/* 折叠问答 */
.page-faq .faq-item {
  background: var(--midnight);
  border: 1px solid var(--line);
  border-left: 3px solid var(--line-strong);
  border-radius: var(--radius);
  margin-bottom: 0.7rem;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-faq .faq-item[open] {
  border-left-color: var(--orange);
  background: var(--space-800);
}

.page-faq .faq-item summary {
  display: flex;
  align-items: baseline;
  gap: 0.9rem;
  padding: 1rem 1.1rem;
  cursor: pointer;
  list-style: none;
  color: var(--paper);
  font-weight: 600;
  font-size: 1rem;
  line-height: 1.5;
}

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

.page-faq .faq-item summary::after {
  content: "+";
  margin-left: auto;
  flex: none;
  font-family: var(--font-mono);
  font-size: 1.15rem;
  line-height: 1;
  color: var(--cyan);
}

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

.page-faq .faq-item summary:hover {
  color: var(--cyan);
}

.page-faq .faq-item summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

.page-faq .faq-item__body {
  padding: 0 1.1rem 1.1rem;
  border-top: 1px dashed var(--line-soft);
  margin-top: 0.15rem;
  padding-top: 0.9rem;
}

.page-faq .faq-item__body p {
  margin: 0 0 0.7rem;
  max-width: 72ch;
  color: var(--body-text);
  font-size: 0.95rem;
  line-height: 1.8;
}

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

.page-faq .faq-item__body a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.page-faq .faq-item__body a:hover {
  color: var(--orange);
}

/* 右侧快捷轨道 */
.page-faq .faq-rail {
  display: grid;
  gap: 1.25rem;
}

.page-faq .faq-rail__card {
  padding: 1.15rem 1.1rem 1.25rem;
}

.page-faq .faq-rail__title {
  font-family: var(--font-head);
  font-weight: 400;
  font-size: 1.35rem;
  line-height: 1.2;
  margin: 0.35rem 0 0.6rem;
  color: var(--paper);
}

.page-faq .faq-rail__desc {
  margin: 0 0 1rem;
  color: var(--body-text);
  font-size: 0.88rem;
  line-height: 1.75;
}

.page-faq .faq-rail__contact {
  list-style: none;
  margin: 0 0 1.15rem;
  padding: 0;
  display: grid;
  gap: 0.7rem;
}

.page-faq .faq-rail__contact li {
  display: grid;
  gap: 0.15rem;
  font-size: 0.88rem;
  line-height: 1.55;
  color: var(--paper);
  word-break: break-word;
}

.page-faq .faq-rail__label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-faq .faq-rail__contact a {
  color: var(--cyan);
  text-decoration: none;
}

.page-faq .faq-rail__contact a:hover {
  color: var(--orange);
  text-decoration: underline;
}

.page-faq .faq-rail__btn {
  display: inline-block;
  width: 100%;
  text-align: center;
}

.page-faq .faq-rail__card--paper .eyebrow {
  color: var(--chili);
}

.page-faq .faq-links {
  list-style: none;
  margin: 0.5rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.1rem;
}

.page-faq .faq-links a {
  display: block;
  padding: 0.5rem 0;
  border-bottom: 1px solid rgba(26, 18, 11, 0.16);
  color: var(--ink);
  text-decoration: none;
  font-size: 0.9rem;
}

.page-faq .faq-links li:last-child a {
  border-bottom: 0;
}

.page-faq .faq-links a:hover {
  color: var(--chili);
}

/* 平板：索引与正文两栏，快捷轨道横铺 */
@media (min-width: 48rem) {
  .page-faq .faq-layout {
    grid-template-columns: 12.5rem minmax(0, 1fr);
    gap: 2.25rem;
  }

  .page-faq .faq-rail {
    grid-column: 1 / -1;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.5rem;
  }
}

/* 桌面：三栏文档式，索引与快捷轨道随滚动停靠 */
@media (min-width: 62rem) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: center;
    gap: 3rem;
    padding-block: 3.25rem 3.75rem;
  }

  .page-faq .faq-layout {
    grid-template-columns: 12.5rem minmax(0, 1fr) 15.5rem;
    gap: 2.5rem;
    padding-block: 3rem 4.5rem;
  }

  .page-faq .faq-index {
    position: sticky;
    top: var(--faq-rail-top);
  }

  .page-faq .faq-rail {
    grid-column: auto;
    grid-template-columns: minmax(0, 1fr);
    position: sticky;
    top: var(--faq-rail-top);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-index__list a,
  .page-faq .faq-item {
    transition: none;
  }
}
</main>