.page-faq {
  background-color: var(--ink);
  background-image:
    linear-gradient(rgba(65, 72, 82, 0.16) 1px, transparent 1px),
    linear-gradient(90deg, rgba(65, 72, 82, 0.16) 1px, transparent 1px);
  background-size: 24px 24px;
  color: var(--cream);
  padding-bottom: 88px;
}

.page-faq .crumbs {
  margin: 24px 0 0;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  padding: 36px 0 44px;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-hero h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(28px, 5.2vw, 52px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  margin: 14px 0 0;
  max-width: 16ch;
  color: var(--cream);
}

.page-faq .faq-hero__lede {
  margin: 20px 0 0;
  max-width: 62ch;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.8;
  color: var(--mute-2);
}

.page-faq .faq-hero__note {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin: 26px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mute);
}

.page-faq .faq-hero__note span {
  position: relative;
  padding-left: 14px;
}

.page-faq .faq-hero__note span::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 6px;
  height: 6px;
  background: var(--clay);
  transform: rotate(45deg);
}

.page-faq .faq-hero__note span:nth-child(2)::before {
  background: var(--ice);
}

.page-faq .faq-hero__note span:nth-child(3)::before {
  background: var(--lime);
}

/* ---------- 图片 ---------- */
.page-faq .faq-figure {
  margin: 40px 0 0;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--line);
  background: var(--slate);
}

.page-faq .faq-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mute);
}

.page-faq .faq-figure--inline {
  margin: 20px 0 22px;
}

.page-faq .faq-figure--inline img {
  aspect-ratio: 3 / 2;
}

/* ---------- 主布局 ---------- */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 36px;
  padding-top: 48px;
}

.page-faq .faq-index__title {
  margin: 0 0 6px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--clay);
}

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

.page-faq .faq-index__list li {
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-index__list a {
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding: 12px 4px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--mute-2);
  text-decoration: none;
  transition: color 0.16s ease, background-color 0.16s ease;
}

.page-faq .faq-index__list a:hover,
.page-faq .faq-index__list a:focus-visible {
  color: var(--cream);
  background-color: rgba(0, 168, 232, 0.1);
}

.page-faq .faq-index__no {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ice);
}

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

.page-faq .faq-body h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(22px, 3.2vw, 32px);
  line-height: 1.3;
  color: var(--cream);
}

.page-faq .faq-body__sub {
  margin: 10px 0 24px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mute);
}

/* ---------- 折叠问答 ---------- */
.page-faq .qa {
  position: relative;
  border-top: 1px solid var(--line);
  scroll-margin-top: calc(var(--head-h) + 24px);
}

.page-faq .qa:last-of-type {
  border-bottom: 1px solid var(--line);
}

.page-faq .qa[open] {
  background-image: linear-gradient(90deg, rgba(0, 168, 232, 0.08), rgba(0, 168, 232, 0) 62%);
}

.page-faq .qa[open]::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--ice);
}

.page-faq .qa summary {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr) 22px;
  gap: 14px;
  align-items: start;
  padding: 20px 16px;
  cursor: pointer;
  list-style: none;
}

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

.page-faq .qa summary:focus-visible {
  outline: 1px solid var(--lime);
  outline-offset: -1px;
}

.page-faq .qa summary::after {
  content: "＋";
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1.5;
  color: var(--ice);
  text-align: right;
  transition: color 0.16s ease;
}

.page-faq .qa[open] summary::after {
  content: "－";
  color: var(--lime);
}

.page-faq .qa__no {
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--clay);
}

.page-faq .qa__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16.5px;
  line-height: 1.55;
  color: var(--cream);
}

.page-faq .qa:target summary {
  background-color: rgba(199, 255, 77, 0.07);
}

.page-faq .qa__body {
  padding: 0 16px 26px;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--mute-2);
}

.page-faq .qa__body p {
  margin: 0 0 14px;
  max-width: 68ch;
}

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

.page-faq .qa__body a {
  color: var(--ice-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(127, 216, 245, 0.45);
  transition: color 0.16s ease, border-color 0.16s ease;
}

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

/* ---------- 三步路径 ---------- */
.page-faq .steps {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
}

.page-faq .steps__item {
  position: relative;
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 16px;
  padding-bottom: 24px;
}

.page-faq .steps__item:last-child {
  padding-bottom: 0;
}

.page-faq .steps__item:not(:last-child)::before {
  content: "";
  position: absolute;
  left: 19px;
  top: 40px;
  bottom: 0;
  width: 1px;
  background: var(--line);
}

.page-faq .steps__node {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--ice);
  background: var(--ink);
  color: var(--ice);
  font-family: var(--font-mono);
  font-size: 14px;
  text-decoration: none;
  transition: background-color 0.16s ease, color 0.16s ease;
}

.page-faq .steps__node:hover,
.page-faq .steps__node:focus-visible {
  background: var(--ice);
  color: var(--ink);
}

.page-faq .steps__txt h4 {
  margin: 8px 0 6px;
  font-family: var(--font-display);
  font-size: 15.5px;
  font-weight: 700;
  color: var(--cream);
}

.page-faq .steps__txt p {
  margin: 0;
  max-width: 60ch;
}

/* ---------- 批次与标签列表 ---------- */
.page-faq .phases {
  list-style: none;
  margin: 20px 0 20px;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-faq .phases__item {
  display: grid;
  gap: 6px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.page-faq .phases__name {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--flame);
}

.page-faq .phases__item p {
  margin: 0;
  max-width: 62ch;
}

/* ---------- 双端对比 ---------- */
.page-faq .compare {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin: 4px 0 20px;
}

.page-faq .compare__card {
  background: var(--cream);
  color: var(--ink);
  border-top: 3px solid var(--clay);
  padding: 20px 18px;
}

.page-faq .compare__card--alt {
  border-top-color: var(--ice);
}

.page-faq .compare__card h4 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 15.5px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--ink);
}

.page-faq .compare__card ul {
  margin: 0;
  padding-left: 18px;
}

.page-faq .compare__card li {
  margin-bottom: 6px;
  font-size: 14.5px;
  line-height: 1.7;
  color: #2C3238;
}

.page-faq .compare__card li:last-child {
  margin-bottom: 0;
}

/* ---------- 联系条 ---------- */
.page-faq .contact-strip {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 20px;
  padding: 20px 18px;
  border: 1px solid var(--line);
  background: var(--slate);
}

.page-faq .contact-strip__item {
  display: grid;
  gap: 4px;
}

.page-faq .contact-strip__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mute);
}

.page-faq .contact-strip__value {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.02em;
  color: var(--lime);
  word-break: break-all;
}

.page-faq .contact-strip__note {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--mute-2);
}

.page-faq .contact-strip__note a {
  color: var(--ice-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(127, 216, 245, 0.45);
}

.page-faq .contact-strip__note a:hover {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-faq .crumbs {
    margin-top: 32px;
  }

  .page-faq .faq-hero {
    padding: 48px 0 56px;
  }

  .page-faq .faq-figure {
    margin-top: 48px;
  }

  .page-faq .qa summary {
    grid-template-columns: 40px minmax(0, 1fr) 24px;
    gap: 18px;
    padding: 24px 22px;
  }

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

  .page-faq .qa__body {
    padding: 0 22px 30px 80px;
  }

  .page-faq .phases__item {
    grid-template-columns: 130px minmax(0, 1fr);
    gap: 22px;
    align-items: baseline;
    padding: 16px 0;
  }

  .page-faq .compare {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

  .page-faq .contact-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px 32px;
    padding: 24px 22px;
  }

  .page-faq .contact-strip__note {
    grid-column: 1 / -1;
  }
}

@media (min-width: 1000px) {
  .page-faq {
    padding-bottom: 120px;
  }

  .page-faq .faq-layout {
    grid-template-columns: 264px minmax(0, 1fr);
    gap: 60px;
    padding-top: 60px;
  }

  .page-faq .faq-index {
    position: sticky;
    top: calc(var(--head-h) + 20px);
    align-self: start;
    max-height: calc(100vh - var(--head-h) - 48px);
    overflow-y: auto;
  }

  .page-faq .faq-figure--inline {
    max-width: 78%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-index__list a,
  .page-faq .steps__node,
  .page-faq .qa summary::after {
    transition: none;
  }
}