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

.page-faq .breadcrumb {
  padding: 18px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--mist);
}

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

.page-faq .breadcrumb a:hover {
  color: var(--cyan);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(30px, 5vw, 72px) 0 clamp(36px, 6vw, 80px);
  border-bottom: 1px solid var(--line);
  background-color: var(--ink);
  background-image:
    linear-gradient(135deg, rgba(27, 38, 42, .95) 0%, rgba(27, 38, 42, .95) 33%, rgba(27, 38, 42, 0) 33.3%),
    repeating-linear-gradient(0deg, rgba(63, 224, 206, .045) 0 1px, transparent 1px 54px),
    repeating-linear-gradient(90deg, rgba(63, 224, 206, .045) 0 1px, transparent 1px 54px);
}

.page-faq .faq-hero__inner {
  display: grid;
  gap: 34px;
  align-items: center;
}

.page-faq .eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-faq h1 {
  margin: 0 0 18px;
  font-size: clamp(30px, 6.4vw, 58px);
  line-height: 1.06;
  letter-spacing: -.025em;
  font-weight: 700;
  color: var(--cream);
}

.page-faq .faq-hero__lead {
  margin: 0 0 26px;
  max-width: 60ch;
  font-size: 17px;
  line-height: 1.85;
  color: var(--text);
}

.page-faq .faq-hero__stats {
  margin: 0 0 26px;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.page-faq .faq-hero__stats .stat {
  padding: 12px 12px 12px 0;
  border-top: 1px solid var(--line);
}

.page-faq .stat__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(24px, 4vw, 34px);
  line-height: 1.1;
  letter-spacing: 0;
  color: var(--cyan);
}

.page-faq .stat__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-faq .faq-hero__figure {
  margin: 0;
}

.page-faq .faq-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  filter: saturate(.55) contrast(1.06);
}

/* ---------- 三步路径 ---------- */
.page-faq .faq-steps {
  padding: clamp(34px, 5vw, 68px) 0 clamp(30px, 4vw, 56px);
  background: var(--ink-deep);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-steps__head h2 {
  margin: 0 0 10px;
  font-size: clamp(21px, 3.4vw, 30px);
  letter-spacing: -.01em;
  color: var(--cream);
}

.page-faq .faq-steps__head p {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-faq .steps {
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0;
}

.page-faq .steps__item {
  position: relative;
  padding: 22px 0 24px;
  border-top: 1px solid var(--line);
}

.page-faq .steps__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 54px;
  height: 54px;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 20px;
  letter-spacing: 0;
  color: var(--cyan);
  background: var(--cyan-soft);
  border: 1px solid var(--line);
}

.page-faq .steps__title {
  margin: 0 0 8px;
  font-size: 18px;
  line-height: 1.4;
  color: var(--cream);
}

.page-faq .steps__desc {
  margin: 0 0 12px;
  max-width: 42ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text);
}

.page-faq .steps__link {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  padding-bottom: 3px;
}

.page-faq .steps__link:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 问答主体 ---------- */
.page-faq .faq-body {
  padding: clamp(36px, 6vw, 80px) 0 clamp(40px, 6vw, 88px);
}

.page-faq .faq-layout {
  display: grid;
  gap: 30px;
}

.page-faq .faq-nav {
  display: grid;
  gap: 0;
  align-content: start;
}

.page-faq .faq-nav .index-label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-faq .faq-nav__link {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 10px 0;
  font-size: 14px;
  line-height: 1.5;
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: color .2s var(--ease);
}

.page-faq .faq-nav__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--blue);
  transition: color .2s var(--ease);
}

.page-faq .faq-nav__link:hover,
.page-faq .faq-nav__link.is-active {
  color: var(--cream);
}

.page-faq .faq-nav__link:hover .faq-nav__num,
.page-faq .faq-nav__link.is-active .faq-nav__num {
  color: var(--cyan);
}

.page-faq .faq-group {
  margin: 0 0 clamp(38px, 5vw, 64px);
  scroll-margin-top: calc(var(--bar-h) + 24px);
}

.page-faq .faq-group__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 14px;
  align-items: start;
  padding-bottom: 14px;
  border-bottom: 2px solid var(--line);
}

.page-faq .faq-group__num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--cyan);
  padding-top: 8px;
}

.page-faq .faq-group__head h2 {
  margin: 0;
  font-size: clamp(21px, 3.4vw, 30px);
  letter-spacing: -.01em;
  color: var(--cream);
}

.page-faq .faq-group__head p {
  grid-column: 1 / -1;
  margin: 2px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

.page-faq .qa-item {
  position: relative;
  padding-left: 16px;
  border-bottom: 1px solid var(--line);
}

.page-faq .qa-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  bottom: 16px;
  width: 3px;
  background: var(--cyan);
  opacity: 0;
  transition: opacity .25s var(--ease);
}

.page-faq .qa-item[open]::before {
  opacity: 1;
}

.page-faq .qa-q {
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 16px;
  align-items: center;
  padding: 18px 4px 18px 0;
  font-size: 16.5px;
  font-weight: 600;
  line-height: 1.55;
  color: var(--cream);
}

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

.page-faq .qa-q::marker {
  content: "";
}

.page-faq .qa-q::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 19px;
  line-height: 1;
  color: var(--mist);
  transition: color .2s var(--ease);
}

.page-faq .qa-item[open] .qa-q::after {
  content: "–";
  color: var(--cyan);
}

.page-faq .qa-q:hover {
  color: #fff;
}

.page-faq .qa-q:focus-visible {
  outline: 1px solid var(--cyan);
  outline-offset: 3px;
}

.page-faq .qa-a {
  padding: 0 0 22px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text);
}

.page-faq .qa-a > p {
  margin: 0 0 12px;
  max-width: 72ch;
}

.page-faq .qa-a > p:last-child {
  margin-bottom: 0;
}

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

.page-faq .qa-a a:hover {
  border-bottom-color: var(--cyan);
}

/* 分布读法示意 */
.page-faq .dist-demo {
  display: block;
  width: 100%;
  max-width: 420px;
  height: auto;
  margin: 16px 0 18px;
}

.page-faq .dist-demo__cap {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  fill: var(--mist);
}

/* 字段表 */
.page-faq .table-wrap {
  margin: 2px 0 16px;
  overflow-x: auto;
  border: 1px solid var(--line);
}

.page-faq .data-table {
  width: 100%;
  min-width: 420px;
  border-collapse: collapse;
  font-size: 15px;
  line-height: 1.7;
}

.page-faq .data-table th,
.page-faq .data-table td {
  padding: 10px 14px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}

.page-faq .data-table th {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--mist);
  background: var(--graphite);
}

.page-faq .data-table td {
  color: var(--text);
}

.page-faq .data-table td:first-child {
  color: var(--cream);
  white-space: nowrap;
  font-weight: 600;
}

.page-faq .data-table tr:last-child td {
  border-bottom: 0;
}

/* 场景配图 */
.page-faq .faq-figure {
  margin: 0 0 24px;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
  filter: saturate(.6) contrast(1.06);
}

/* ---------- 收尾 ---------- */
.page-faq .faq-tail {
  padding: 0 0 clamp(46px, 7vw, 96px);
}

.page-faq .faq-tail__panel {
  padding: clamp(26px, 4vw, 46px);
  background: var(--cream);
  color: var(--brown);
}

.page-faq .faq-tail__panel .index-label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-faq .faq-tail__panel h2 {
  margin: 0 0 12px;
  font-size: clamp(22px, 3.6vw, 34px);
  letter-spacing: -.015em;
  color: var(--brown);
}

.page-faq .faq-tail__panel p {
  margin: 0 0 22px;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--brown);
}

.page-faq .faq-tail__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-faq .faq-tail__panel .btn--ghost {
  color: var(--brown);
  border-color: rgba(36, 30, 27, .35);
}

.page-faq .faq-tail__panel .btn--ghost:hover {
  border-color: var(--brown);
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-faq .faq-group__head p {
    grid-column: 2;
    margin-top: 4px;
  }

  .page-faq .steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-faq .steps__item {
    padding: 24px 26px 26px 0;
    border-top: 1px solid var(--line);
  }

  .page-faq .steps__item + .steps__item {
    padding-left: 26px;
    border-left: 1px solid var(--line);
  }

  .page-faq .qa-q {
    font-size: 18px;
  }
}

@media (min-width: 980px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: 48px;
  }

  .page-faq .faq-hero__figure {
    margin-right: calc(-1 * var(--edge));
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-layout {
    grid-template-columns: 214px minmax(0, 1fr);
    gap: 52px;
  }

  .page-faq .faq-nav {
    position: sticky;
    top: calc(var(--bar-h) + 28px);
    align-self: start;
  }
}

@media (max-width: 420px) {
  .page-faq .faq-hero__stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .qa-item {
    padding-left: 12px;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa-item::before,
  .page-faq .qa-q::after,
  .page-faq .faq-nav__link,
  .page-faq .faq-nav__num {
    transition: none;
  }
}