.page-faq {
  --faq-cut: 14px;
  --faq-gap: clamp(0.9rem, 2.2vw, 1.5rem);
  --faq-block: clamp(2.4rem, 6vw, 4.5rem);
  padding-bottom: clamp(2rem, 5vw, 4rem);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  padding-top: clamp(1.2rem, 3vw, 2.2rem);
  padding-bottom: var(--faq-block);
  border-bottom: 1px solid var(--line);
  position: relative;
}

.page-faq .faq-hero::after {
  content: "";
  display: block;
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan) 0 18%, var(--orange) 18% 24%, transparent 24%);
}

.page-faq .faq-hero__inner {
  display: grid;
  gap: var(--faq-gap);
  align-items: end;
}

.page-faq .faq-hero__copy h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.1rem, 6.5vw, 4.1rem);
  line-height: 1.06;
  letter-spacing: -0.015em;
  color: var(--paper);
  margin: 0.55rem 0 1rem;
  max-width: 22ch;
}

.page-faq .faq-hero__copy .lede {
  color: var(--muted);
  max-width: 62ch;
  margin: 0;
  line-height: 1.78;
}

.page-faq .faq-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line);
}

.page-faq .faq-stats .stat {
  background: var(--panel);
  padding: 0.85rem 0.9rem;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.page-faq .faq-stats .stat__value {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.25rem, 3vw, 1.65rem);
  color: var(--cyan);
  line-height: 1.1;
}

.page-faq .faq-stats .stat__label {
  font-size: var(--step--1);
  color: var(--muted);
  line-height: 1.45;
}

/* ---------- 图片容器 ---------- */
.page-faq .faq-plate {
  margin: var(--faq-gap) 0 0;
  position: relative;
  background: var(--panel);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
  overflow: hidden;
}

.page-faq .faq-plate img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 1400 / 600;
}

.page-faq .faq-plate--side {
  margin: 0;
}

.page-faq .faq-plate--side img {
  aspect-ratio: 4 / 3;
}

.page-faq .faq-plate__cap {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.02em;
  color: var(--muted);
  padding: 0.6rem 0.85rem 0.7rem;
  border-top: 1px dashed var(--line);
  background: var(--ink);
}

/* ---------- 主体两栏 ---------- */
.page-faq .faq-body {
  display: grid;
  gap: clamp(1.5rem, 3.5vw, 3rem);
  padding-top: var(--faq-block);
  align-items: start;
}

/* ---------- 左侧导轨 ---------- */
.page-faq .faq-rail {
  display: grid;
  gap: 1.1rem;
  border: 1px solid var(--line);
  background: var(--panel);
  padding: 1rem;
  clip-path: polygon(0 0, calc(100% - var(--faq-cut)) 0, 100% var(--faq-cut), 100% 100%, 0 100%);
}

.page-faq .faq-rail__title {
  margin: 0 0 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.page-faq .faq-rail__title::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--line);
}

.page-faq .faq-rail__list,
.page-faq .faq-rail__links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.3rem;
}

.page-faq .faq-rail__list a,
.page-faq .faq-rail__links a {
  display: flex;
  align-items: baseline;
  gap: 0.55rem;
  padding: 0.5rem 0.55rem;
  color: var(--paper);
  text-decoration: none;
  font-size: 0.94rem;
  border-left: 2px solid transparent;
  transition: background 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}

.page-faq .faq-rail__list a .num {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--orange);
  letter-spacing: 0.04em;
}

.page-faq .faq-rail__links a {
  color: var(--muted);
  font-size: 0.9rem;
}

.page-faq .faq-rail__list a:hover,
.page-faq .faq-rail__list a:focus-visible,
.page-faq .faq-rail__links a:hover,
.page-faq .faq-rail__links a:focus-visible {
  background: var(--cyan-wash);
  border-left-color: var(--cyan);
  color: var(--paper);
  outline: none;
}

.page-faq .faq-rail__block--soft {
  border-top: 1px dashed var(--line);
  padding-top: 0.9rem;
}

/* ---------- 章节 ---------- */
.page-faq .faq-main {
  display: grid;
  gap: var(--faq-block);
  min-width: 0;
}

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

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

.page-faq .faq-sec .chapter {
  display: flex;
  gap: 0.9rem;
  align-items: flex-start;
  margin-bottom: var(--faq-gap);
}

.page-faq .faq-sec .chapter__num {
  font-family: var(--font-mono);
  font-size: clamp(2.1rem, 7vw, 3.6rem);
  font-weight: 700;
  line-height: 0.9;
  color: transparent;
  -webkit-text-stroke: 1px var(--rule);
  flex: none;
}

.page-faq .faq-sec .chapter__body {
  min-width: 0;
}

.page-faq .faq-sec .section-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.35rem, 3.6vw, 2.1rem);
  line-height: 1.16;
  color: var(--paper);
  margin: 0.3rem 0 0.6rem;
  letter-spacing: -0.01em;
}

.page-faq .faq-sec .chapter__body p {
  margin: 0;
  color: var(--muted);
  max-width: 66ch;
  line-height: 1.75;
  font-size: 0.96rem;
}

/* ---------- 三步卡 ---------- */
.page-faq .faq-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line);
}

.page-faq .faq-step {
  background: var(--card);
  padding: 1.1rem 1rem 1.15rem;
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  scroll-margin-top: calc(var(--frame-h) + 1.5rem);
}

.page-faq .faq-step::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--cyan);
}

.page-faq .faq-step:nth-child(2)::before {
  background: var(--orange);
}

.page-faq .faq-step:nth-child(3)::before {
  background: var(--cyan-soft);
}

.page-faq .faq-step__num {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--orange);
  letter-spacing: 0.08em;
}

.page-faq .faq-step:nth-child(2) .faq-step__num {
  color: var(--cyan);
}

.page-faq .faq-step__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--paper);
  letter-spacing: 0.01em;
}

.page-faq .faq-step__text {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.72;
}

.page-faq .faq-step__where {
  margin-top: auto;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--rule);
  letter-spacing: 0.02em;
  border-top: 1px dashed var(--line);
  padding-top: 0.5rem;
}

/* ---------- 问答手风琴 ---------- */
.page-faq .faq-qa {
  display: grid;
  gap: 0.55rem;
}

.page-faq .qa {
  background: var(--card);
  border: 1px solid var(--line);
  border-left: 3px solid var(--rule);
  clip-path: polygon(0 0, calc(100% - var(--faq-cut)) 0, 100% var(--faq-cut), 100% 100%, 0 100%);
  transition: border-color 0.18s ease, background 0.18s ease;
}

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

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

.page-faq .qa summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: flex-start;
  gap: 0.7rem;
  padding: 0.85rem 2.3rem 0.85rem 0.95rem;
  position: relative;
}

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

.page-faq .qa summary h3 {
  margin: 0;
  font-family: var(--font-body);
  font-size: 0.98rem;
  font-weight: 600;
  line-height: 1.55;
  color: var(--paper);
}

.page-faq .qa summary::after {
  content: "+";
  position: absolute;
  right: 0.85rem;
  top: 0.7rem;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  line-height: 1;
  color: var(--orange);
}

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

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

.page-faq .qa__a {
  padding: 0 1rem 0.95rem 0.95rem;
  border-top: 1px dashed var(--line);
  margin-top: -0.1rem;
}

.page-faq .qa__a p {
  margin: 0.7rem 0 0;
  color: var(--muted);
  font-size: 0.93rem;
  line-height: 1.78;
  max-width: 64ch;
}

/* ---------- 资料下载区布局 ---------- */
.page-faq .faq-download {
  display: grid;
  gap: var(--faq-gap);
  align-items: start;
}

/* ---------- 支持卡 ---------- */
.page-faq .faq-support {
  display: grid;
  gap: 0.75rem;
  margin-bottom: var(--faq-gap);
}

.page-faq .faq-support__card {
  background: var(--card);
  border: 1px solid var(--line);
  border-top: 3px solid var(--cyan);
  padding: 1rem 1rem 1.1rem;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
}

.page-faq .faq-support__card--orange {
  border-top-color: var(--orange);
}

.page-faq .faq-support__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.08rem;
  font-weight: 800;
  color: var(--paper);
}

.page-faq .faq-support__card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.72;
}

.page-faq .faq-support__card .btn {
  align-self: flex-start;
  margin-top: 0.15rem;
}

/* ---------- 联系方式 ---------- */
.page-faq .faq-contact {
  border: 1px solid var(--line);
  background: var(--panel);
  padding: 0.3rem 0.9rem;
  margin: 0 0 var(--faq-gap);
}

.page-faq .faq-contact .contact-list__item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.4rem 0.8rem;
  padding: 0.7rem 0;
  border-bottom: 1px dashed var(--line);
}

.page-faq .faq-contact .contact-list__item:last-child {
  border-bottom: 0;
}

.page-faq .faq-contact .contact-list__key {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--cyan);
  min-width: 5.2rem;
}

.page-faq .faq-contact .contact-list__value {
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 0.92rem;
  word-break: break-all;
}

.page-faq .faq-contact .copy-btn {
  margin-left: auto;
}

.page-faq .faq-foot-note {
  margin: 0 0 var(--faq-gap);
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.72;
}

.page-faq .faq-foot-note a {
  color: var(--cyan-soft);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .faq-foot-note a:hover {
  color: var(--paper);
}

.page-faq .faq-top {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--muted);
  text-decoration: none;
  border: 1px solid var(--line);
  padding: 0.5rem 0.85rem;
  transition: color 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

.page-faq .faq-top:hover,
.page-faq .faq-top:focus-visible {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
  outline: none;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-faq .faq-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 960px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1.7fr) minmax(0, 1fr);
    gap: clamp(1.5rem, 4vw, 3.5rem);
  }

  .page-faq .faq-body {
    grid-template-columns: minmax(230px, 282px) minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.5rem);
  }

  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--frame-h) + 1.2rem);
  }

  .page-faq .faq-download {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.35fr);
    gap: clamp(1.2rem, 2.6vw, 2rem);
  }

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

  .page-faq .faq-sec .chapter__num {
    font-size: clamp(3rem, 5vw, 4.6rem);
  }
}

@media (max-width: 380px) {
  .page-faq .faq-contact .contact-list__key {
    min-width: 100%;
  }

  .page-faq .faq-contact .copy-btn {
    margin-left: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa,
  .page-faq .faq-top,
  .page-faq .faq-rail__list a,
  .page-faq .faq-rail__links a {
    transition: none;
  }
}
<<<END>>>