.page-faq {
  --faq-flow: clamp(48px, 7vw, 96px);
  --faq-gap: clamp(20px, 3.2vw, 44px);
  --faq-card-r: 2px 16px 2px 2px;
  padding-bottom: clamp(64px, 9vw, 128px);
}

.page-faq .breadcrumb {
  margin-bottom: clamp(22px, 3.5vw, 44px);
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  padding-bottom: clamp(30px, 4.5vw, 60px);
  border-bottom: 1px solid var(--c-line);
}

.page-faq .faq-hero h1 {
  margin: 10px 0 0;
  max-width: 18ch;
  line-height: 1.04;
}

.page-faq .faq-hero__text {
  margin: 18px 0 0;
  max-width: var(--w-read);
  color: var(--c-body);
  font-size: var(--fs-body);
  line-height: 1.75;
}

@media (min-width: 900px) {
  .page-faq .faq-hero {
    display: grid;
    grid-template-columns: minmax(0, 1.18fr) minmax(0, 0.82fr);
    column-gap: clamp(28px, 5vw, 80px);
    align-items: end;
  }
  .page-faq .faq-hero .eyebrow {
    grid-column: 1 / -1;
  }
  .page-faq .faq-hero h1 {
    grid-column: 1;
    margin-bottom: 0;
  }
  .page-faq .faq-hero__text {
    grid-column: 2;
    margin: 0 0 6px;
    font-size: 15.5px;
  }
}

/* ---------- 主体两栏 ---------- */

.page-faq .faq-layout {
  margin-top: var(--faq-flow);
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--faq-gap);
}

@media (min-width: 1000px) {
  .page-faq .faq-layout {
    grid-template-columns: 188px minmax(0, 1fr);
    column-gap: clamp(32px, 4.5vw, 80px);
  }
  .page-faq .faq-rail {
    position: sticky;
    top: 104px;
    align-self: start;
  }
}

.page-faq .faq-rail__label {
  display: block;
  color: var(--c-body);
  margin-bottom: 12px;
}

.page-faq .faq-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 0;
  overflow-x: auto;
  scrollbar-width: thin;
  border-bottom: 1px solid var(--c-line);
}

.page-faq .faq-rail__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 16px 9px 0;
  border-top: 2px solid transparent;
  color: var(--c-body);
  font-size: 14px;
  line-height: 1.5;
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-faq .faq-rail__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--c-data-viz);
  transition: color var(--t-fast) var(--ease);
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  color: var(--c-head);
  border-top-color: var(--c-cyan);
}

.page-faq .faq-rail__link:hover .faq-rail__num,
.page-faq .faq-rail__link:focus-visible .faq-rail__num {
  color: var(--c-cyan);
}

@media (min-width: 1000px) {
  .page-faq .faq-rail__list {
    flex-direction: column;
    overflow: visible;
    border-bottom: none;
    border-left: 1px solid var(--c-line);
  }
  .page-faq .faq-rail__link {
    padding: 9px 0 9px 14px;
    border-top: none;
    border-left: 2px solid transparent;
    margin-left: -2px;
    white-space: normal;
  }
  .page-faq .faq-rail__link:hover,
  .page-faq .faq-rail__link:focus-visible {
    border-top-color: transparent;
    border-left-color: var(--c-cyan);
  }
}

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

/* ---------- 章节 ---------- */

.page-faq .faq-sec {
  scroll-margin-top: 104px;
}

.page-faq .faq-sec + .faq-sec {
  margin-top: var(--faq-flow);
  padding-top: var(--faq-flow);
  border-top: 1px solid var(--c-line);
}

.page-faq .faq-sec__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 14px;
}

.page-faq .faq-sec__num {
  color: var(--c-cyan);
  font-family: var(--font-mono);
  letter-spacing: 0.16em;
}

.page-faq .faq-sec__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--fs-block);
  font-weight: 400;
  letter-spacing: -0.01em;
  line-height: 1.15;
  color: var(--c-head);
}

.page-faq .faq-sec__lead {
  margin: 0 0 20px;
  max-width: var(--w-read);
  color: var(--c-body);
  font-size: var(--fs-body);
  line-height: 1.75;
}

.page-faq .num {
  font-family: var(--font-mono);
  color: var(--c-head);
  border-bottom: 1px dotted var(--c-cyan);
  padding-bottom: 1px;
}

/* ---------- 插图 ---------- */

.page-faq .faq-figure {
  margin: 24px 0 26px;
}

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

.page-faq .faq-figure--narrow img {
  max-width: 620px;
}

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

/* ---------- 三步上手 ---------- */

.page-faq .steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  counter-reset: none;
}

.page-faq .steps__item {
  position: relative;
  padding: 24px 22px 26px;
  background: linear-gradient(180deg, var(--c-capsule) 0%, var(--c-panel) 100%);
  border: 1px solid var(--c-line);
  border-radius: var(--faq-card-r);
  transition: border-color var(--t-base) var(--ease);
}

.page-faq .steps__item:hover {
  border-color: var(--c-cyan);
}

.page-faq .steps__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 34px;
  height: 2px;
  background: var(--c-cyan);
}

.page-faq .steps__num {
  display: block;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-cyan);
}

.page-faq .steps__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: var(--fs-sub);
  font-weight: 400;
  line-height: 1.25;
  color: var(--c-head);
}

.page-faq .steps__item p {
  margin: 0 0 14px;
  color: var(--c-body);
  font-size: 15px;
  line-height: 1.7;
}

.page-faq .steps__link {
  display: inline-block;
  color: var(--c-cyan);
  font-size: 14px;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}

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

@media (min-width: 780px) {
  .page-faq .steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(14px, 2vw, 26px);
    position: relative;
    padding-top: 22px;
  }
  .page-faq .steps::before {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    height: 1px;
    background: linear-gradient(90deg, var(--c-line) 0%, var(--c-data-viz) 55%, var(--c-cyan) 100%);
  }
  .page-faq .steps__item::after {
    content: "";
    position: absolute;
    top: -26px;
    left: 22px;
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--c-ink);
    border: 1px solid var(--c-cyan);
  }
}

/* ---------- 折叠问答 ---------- */

.page-faq .qa {
  margin-top: 10px;
  background: var(--c-panel);
  border: 1px solid var(--c-line);
  border-radius: var(--faq-card-r);
  transition: border-color var(--t-base) var(--ease);
}

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

.page-faq .qa summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 15px 18px;
  cursor: pointer;
  list-style: none;
  color: var(--c-head);
  font-size: 15.5px;
  line-height: 1.6;
  transition: color var(--t-fast) var(--ease);
}

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

.page-faq .qa summary::after {
  content: "＋";
  margin-left: auto;
  flex: none;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-cyan);
}

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

.page-faq .qa summary:hover,
.page-faq .qa summary:focus-visible {
  color: var(--c-cyan);
}

.page-faq .qa__body {
  padding: 0 18px 18px;
  max-width: var(--w-read);
  color: var(--c-body);
  font-size: 15.5px;
  line-height: 1.75;
}

/* ---------- 联系信息 ---------- */

.page-faq .faq-contact {
  margin-top: 4px;
  padding: clamp(20px, 3vw, 32px);
  background: var(--c-panel);
  border: 1px solid var(--c-line);
  border-left: 2px solid var(--c-cyan);
  border-radius: var(--faq-card-r);
}

.page-faq .contact-line {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  margin: 0 0 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--c-line);
}

.page-faq .contact-line__key {
  flex: none;
  width: 76px;
  font-size: var(--fs-index);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-body);
}

.page-faq .contact-line__val {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.01em;
  color: var(--c-head);
}

.page-faq .faq-contact__note {
  margin: 0 0 20px;
  max-width: var(--w-read);
  color: var(--c-body);
  font-size: 14.5px;
  line-height: 1.75;
}

/* ---------- 结尾入口 ---------- */

.page-faq .faq-outro {
  margin-top: var(--faq-flow);
  padding: clamp(24px, 3.5vw, 40px);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 20px 32px;
  background: linear-gradient(135deg, var(--c-capsule) 0%, var(--c-panel) 62%, var(--c-ink) 100%);
  border: 1px solid var(--c-line);
  border-left: 2px solid var(--c-cyan);
  border-radius: var(--faq-card-r);
}

.page-faq .faq-outro__text {
  margin: 0;
  max-width: 46ch;
  color: var(--c-head);
  font-size: 16px;
  line-height: 1.7;
}

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

@media (max-width: 560px) {
  .page-faq .contact-line__key {
    width: 100%;
  }
  .page-faq .faq-outro__actions {
    width: 100%;
  }
  .page-faq .faq-outro__actions .btn {
    flex: 1 1 auto;
    text-align: center;
  }
}
<<<END>>>
</main>