.page-faq {
  --faq-line: rgba(27, 31, 36, .14);
  --faq-line-strong: rgba(27, 31, 36, .28);
  --faq-ink-soft: rgba(27, 31, 36, .76);
  --faq-ink-faint: rgba(27, 31, 36, .58);
  --faq-slab: #12293F;
  --faq-slab-deep: #0A1A2F;
  display: block;
  background: var(--paper);
  color: var(--paper-ink);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  isolation: isolate;
  background: var(--ink-900);
  padding:
    calc(var(--header-h) + clamp(24px, 5vw, 56px))
    0
    clamp(40px, 7vw, 88px);
  overflow: hidden;
}

.page-faq .faq-hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-faq .faq-hero-bg img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .34;
  filter: saturate(.55) contrast(1.1);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background:
    linear-gradient(180deg, rgba(10, 26, 47, .70) 0%, rgba(10, 26, 47, .90) 58%, var(--ink-900) 100%),
    linear-gradient(96deg, rgba(10, 26, 47, .92) 0%, rgba(10, 26, 47, .30) 68%);
}

.page-faq .faq-hero-shell {
  position: relative;
  z-index: 1;
}

.page-faq .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: clamp(20px, 4vw, 40px);
  font-size: 13px;
  letter-spacing: .04em;
}

.page-faq .breadcrumb a {
  color: rgba(201, 214, 226, .78);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-faq .breadcrumb a:hover,
.page-faq .breadcrumb a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan-a42);
}

.page-faq .breadcrumb a[aria-current="page"] {
  color: var(--cyan);
  border-bottom-color: var(--cyan-a42);
}

.page-faq .breadcrumb span {
  color: var(--hair-40);
}

.page-faq .eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-faq .faq-hero h1 {
  margin: 0 0 clamp(16px, 2.4vw, 26px);
  max-width: 15ch;
  font-size: clamp(40px, 6vw, 88px);
  line-height: .96;
  letter-spacing: -.03em;
  font-weight: 800;
  color: var(--paper);
}

.page-faq .faq-hero .lede {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.78;
  color: rgba(201, 214, 226, .86);
}

.page-faq .hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: clamp(22px, 3.4vw, 34px) 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .hero-tags .tag {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .05em;
  white-space: nowrap;
}

/* ---------- 主体骨架 ---------- */

.page-faq .faq-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(32px, 5vw, 56px);
  padding-block: clamp(40px, 6vw, 76px) clamp(56px, 8vw, 96px);
}

.page-faq .faq-main {
  min-width: 0;
}

.page-faq .faq-sec {
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-faq .faq-sec + .faq-sec {
  margin-top: clamp(42px, 6vw, 76px);
}

/* ---------- 章节头 ---------- */

.page-faq .sec-head {
  margin-bottom: clamp(18px, 3vw, 30px);
  padding-top: 16px;
  border-top: 2px solid var(--faq-line-strong);
  transition: border-color .3s var(--ease);
}

.page-faq .faq-sec:target .sec-head {
  border-top-color: var(--orange);
}

.page-faq .sec-num {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--orange-deep);
}

.page-faq .sec-head h2 {
  margin: 0;
  font-size: clamp(26px, 3.2vw, 40px);
  line-height: 1.06;
  letter-spacing: -.02em;
  font-weight: 800;
  color: var(--paper-ink);
}

.page-faq .sec-note {
  margin: 10px 0 0;
  max-width: 64ch;
  font-size: 14px;
  line-height: 1.74;
  color: var(--faq-ink-faint);
}

.page-faq .sec-note a {
  color: var(--cyan-deep);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan-a42);
}

.page-faq .sec-note a:hover,
.page-faq .sec-note a:focus-visible {
  color: var(--orange-deep);
  border-bottom-color: var(--orange-a42);
}

@media (min-width: 700px) {
  .page-faq .sec-head {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    column-gap: clamp(16px, 2.4vw, 28px);
    align-items: baseline;
  }

  .page-faq .sec-num {
    grid-column: 1;
    grid-row: 1;
    margin: 0;
    padding-top: .55em;
  }

  .page-faq .sec-head h2 {
    grid-column: 2;
    grid-row: 1;
  }

  .page-faq .sec-note {
    grid-column: 2;
    grid-row: 2;
    margin-top: 8px;
  }
}

/* ---------- 口径速查列表 ---------- */

.page-faq .quick-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--faq-line);
}

.page-faq .quick-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: clamp(12px, 2vw, 20px);
  row-gap: 7px;
  padding: 18px 0;
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .quick-idx {
  grid-column: 1;
  grid-row: 1;
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--orange-deep);
  padding-top: .3em;
}

.page-faq .quick-q {
  grid-column: 2;
  grid-row: 1;
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
}

.page-faq .quick-a {
  grid-column: 2;
  grid-row: 2;
  margin: 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--faq-ink-soft);
}

.page-faq .quick-jump {
  grid-column: 2;
  grid-row: 3;
  justify-self: start;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--cyan-deep);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan-a42);
  padding-bottom: 1px;
}

.page-faq .quick-jump::after {
  content: " ↓";
  font-family: var(--font-data);
}

.page-faq .quick-jump:hover,
.page-faq .quick-jump:focus-visible {
  color: var(--orange-deep);
  border-bottom-color: var(--orange-a42);
}

/* ---------- 折叠问答 ---------- */

.page-faq .qa-list {
  border-top: 1px solid var(--faq-line);
}

.page-faq .qa-item {
  border-bottom: 1px solid var(--faq-line);
  border-left: 4px solid transparent;
  transition: border-left-color .22s var(--ease);
}

.page-faq .qa-item[open] {
  border-left-color: var(--cyan);
}

.page-faq .qa-q {
  display: flex;
  align-items: baseline;
  gap: clamp(10px, 1.6vw, 16px);
  padding: 15px clamp(14px, 2vw, 22px);
  background: var(--faq-slab);
  color: var(--hair);
  cursor: pointer;
  list-style: none;
  transition: background .22s var(--ease);
}

.page-faq .qa-q::-webkit-details-marker {
  display: none;
}

.page-faq .qa-q:hover {
  background: var(--faq-slab-deep);
}

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

.page-faq .qa-item[open] > .qa-q {
  background: var(--faq-slab-deep);
}

.page-faq .qa-idx {
  flex: none;
  padding-top: .22em;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--cyan);
}

.page-faq .qa-text {
  flex: 1 1 auto;
  min-width: 0;
  font-size: clamp(16px, 1.5vw, 17px);
  font-weight: 600;
  line-height: 1.55;
  color: inherit;
}

.page-faq .qa-mark {
  position: relative;
  flex: none;
  align-self: center;
  width: 14px;
  height: 14px;
}

.page-faq .qa-mark::before,
.page-faq .qa-mark::after {
  content: "";
  position: absolute;
  background: var(--cyan);
}

.page-faq .qa-mark::before {
  left: 0;
  right: 0;
  top: 50%;
  height: 2px;
  margin-top: -1px;
}

.page-faq .qa-mark::after {
  top: 0;
  bottom: 0;
  left: 50%;
  width: 2px;
  margin-left: -1px;
  transition: transform .24s var(--ease);
}

.page-faq .qa-item[open] .qa-mark::after {
  transform: scaleY(0);
}

.page-faq .qa-a {
  padding:
    clamp(16px, 2.4vw, 24px)
    clamp(14px, 2vw, 22px)
    clamp(20px, 2.8vw, 28px);
  background: var(--paper);
}

.page-faq .qa-item[open] .qa-a {
  animation: faqReveal .24s var(--ease) both;
}

.page-faq .qa-a p {
  margin: 0;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--faq-ink-soft);
}

.page-faq .qa-a p + p {
  margin-top: 12px;
}

.page-faq .qa-a a {
  color: var(--cyan-deep);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan-a42);
}

.page-faq .qa-a a:hover,
.page-faq .qa-a a:focus-visible {
  color: var(--orange-deep);
  border-bottom-color: var(--orange-a42);
}

@keyframes faqReveal {
  from {
    opacity: 0;
    transform: translateY(-5px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 流程图 ---------- */

.page-faq .faq-flow {
  margin: 0 0 clamp(20px, 3vw, 30px);
  aspect-ratio: 3 / 2;
}

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

.page-faq .faq-flow .media-caption {
  font-size: 13px;
  line-height: 1.7;
  color: var(--faq-ink-faint);
}

/* ---------- 右侧速查栏 ---------- */

.page-faq .faq-side {
  min-width: 0;
}

.page-faq .faq-side-inner {
  padding: clamp(18px, 2.4vw, 24px);
  border: 1px solid var(--faq-line-strong);
  background:
    linear-gradient(180deg, rgba(201, 214, 226, .22) 0%, rgba(201, 214, 226, .06) 100%),
    var(--paper);
}

.page-faq .side-title {
  margin: 0 0 18px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--faq-slab-deep);
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--faq-slab-deep);
}

.page-faq .side-group + .side-group {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px dashed var(--faq-line-strong);
}

.page-faq .side-group-title {
  margin: 0 0 8px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--paper-ink);
}

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

.page-faq .side-list a {
  display: block;
  padding: 6px 0 6px 12px;
  position: relative;
  font-size: 14px;
  line-height: 1.55;
  color: var(--faq-ink-soft);
  text-decoration: none;
  transition: color .2s var(--ease), padding-left .2s var(--ease);
}

.page-faq .side-list a::before {
  content: "";
  position: absolute;
  left: 0;
  top: .92em;
  width: 5px;
  height: 1px;
  background: var(--hair-40);
  transition: background .2s var(--ease), width .2s var(--ease);
}

.page-faq .side-list a:hover,
.page-faq .side-list a:focus-visible {
  color: var(--cyan-deep);
  padding-left: 16px;
}

.page-faq .side-list a:hover::before,
.page-faq .side-list a:focus-visible::before {
  width: 11px;
  background: var(--cyan);
}

.page-faq .side-cta {
  display: block;
  margin-top: 22px;
  text-align: center;
}

/* ---------- 桌面骨架 ---------- */

@media (min-width: 960px) {
  .page-faq .faq-body {
    grid-template-columns: minmax(0, 1fr) 288px;
    align-items: start;
    max-width: 1160px;
  }

  .page-faq .faq-side {
    position: sticky;
    top: calc(var(--header-h) + 24px);
    align-self: start;
  }

  .page-faq .faq-side-inner {
    max-height: calc(100vh - var(--header-h) - 48px);
    overflow-y: auto;
  }
}

/* ---------- 窄屏保护 ---------- */

@media (max-width: 560px) {
  .page-faq .faq-hero h1 {
    max-width: 100%;
    font-size: clamp(34px, 10vw, 48px);
  }

  .page-faq .qa-text {
    font-size: 16px;
  }

  .page-faq .hero-tags .tag {
    font-size: 11px;
  }
}

/* ---------- 动效降级 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa-item,
  .page-faq .qa-q,
  .page-faq .qa-mark::after,
  .page-faq .quick-jump,
  .page-faq .sec-head {
    transition-duration: .01ms !important;
  }

  .page-faq .qa-item[open] .qa-a {
    animation: none;
  }
}