.page-faq {
  background: var(--paper);
  color: var(--ink);
  padding-block: clamp(28px, 5vw, 44px) clamp(64px, 9vw, 112px);
}

/* ---------- 面包屑 ---------- */
.page-faq .breadcrumb {
  margin-bottom: clamp(20px, 4vw, 34px);
  font-size: 12px;
  letter-spacing: .08em;
}

.page-faq .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  color: var(--readable-mist);
}

.page-faq .breadcrumb__list li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--mist);
}

.page-faq .breadcrumb a {
  color: var(--readable-mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .18s var(--ease), color .18s var(--ease);
}

.page-faq .breadcrumb a:hover {
  color: var(--ink);
  border-bottom-color: var(--amber);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 40px);
  padding-bottom: clamp(34px, 6vw, 60px);
  border-bottom: 1px solid var(--line);
}

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

.page-faq .faq-hero h1 {
  margin: 12px 0 0;
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: clamp(32px, 5.4vw, 60px);
  line-height: 1.1;
  letter-spacing: -.02em;
  max-width: 20ch;
}

.page-faq .faq-hero__intro {
  margin: 20px 0 0;
  max-width: 46ch;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--readable-mist);
}

.page-faq .faq-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  margin: 24px 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--readable-mist);
}

.page-faq .faq-hero__meta .num {
  font-family: var(--font-mono);
  font-size: 19px;
  font-weight: 700;
  color: var(--shaba);
}

.page-faq .faq-hero__media {
  position: relative;
  margin: 0;
  overflow: hidden;
}

.page-faq .faq-hero__media::before {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 2;
  width: 72px;
  height: 4px;
  background: var(--amber);
}

.page-faq .faq-hero__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

/* ---------- 正文骨架 ---------- */
.page-faq .faq-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 44px);
  padding-top: clamp(34px, 6vw, 60px);
}

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

/* ---------- 分类锚点 ---------- */
.page-faq .faq-rail__title {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--mist);
}

.page-faq .faq-rail__list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-rail__link {
  display: block;
  padding: 8px 10px;
  border-left: 2px solid var(--line-strong);
  font-size: 13.5px;
  line-height: 1.45;
  color: var(--graphite);
  text-decoration: none;
  transition: color .18s var(--ease), border-color .18s var(--ease), background-color .18s var(--ease);
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  color: var(--shaba);
  border-left-color: var(--shaba);
  background: var(--khaki);
}

/* ---------- 区块 ---------- */
.page-faq .faq-block {
  padding-bottom: clamp(34px, 5vw, 54px);
  margin-bottom: clamp(34px, 5vw, 54px);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-block:last-child {
  margin-bottom: 0;
  border-bottom: 0;
}

.page-faq .faq-block .section-title {
  margin: 8px 0 16px;
}

.page-faq .faq-block .body-text {
  max-width: 62ch;
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--readable-mist);
}

.page-faq .faq-block .body-text a {
  color: var(--shaba);
  text-decoration: none;
  border-bottom: 1px solid var(--amber);
}

.page-faq .faq-block .body-text a:hover {
  color: var(--shaba-deep);
}

/* ---------- 三组数字速查 ---------- */
.page-faq .concept-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3vw, 32px);
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .concept {
  padding-top: 18px;
  border-top: 1px solid var(--line-strong);
}

.page-faq .concept__term {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(26px, 3.4vw, 38px);
  line-height: 1.1;
  letter-spacing: -.01em;
  color: var(--ink);
}

.page-faq .concept__term::after {
  content: "";
  display: block;
  width: 48px;
  height: 3px;
  margin-top: 12px;
  background: var(--amber);
}

.page-faq .concept__desc {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--readable-mist);
}

.page-faq .concept__note {
  margin: 12px 0 0;
  padding-left: 10px;
  border-left: 2px solid var(--mist);
  font-size: 13px;
  line-height: 1.7;
  color: var(--readable-mist);
}

/* ---------- 示意图 ---------- */
.page-faq .faq-figure {
  margin: clamp(22px, 3vw, 32px) 0;
  max-width: 620px;
  overflow: hidden;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

/* ---------- 问答折叠 ---------- */
.page-faq .qa {
  position: relative;
  padding-left: clamp(14px, 2.2vw, 22px);
  border-bottom: 1px solid var(--line);
  transition: background-color .2s var(--ease);
}

.page-faq .qa::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--mist);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform .25s var(--ease), background-color .25s var(--ease);
}

.page-faq .qa:hover::before {
  transform: scaleY(1);
}

.page-faq .qa[open] {
  background: var(--khaki);
}

.page-faq .qa[open]::before {
  background: var(--shaba);
  transform: scaleY(1);
}

.page-faq .qa__q {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: clamp(15px, 2.2vw, 20px) 0;
  cursor: pointer;
  list-style: none;
  font-size: 16.5px;
  font-weight: 600;
  line-height: 1.55;
  color: var(--ink);
}

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

.page-faq .qa__q::marker {
  content: "";
}

.page-faq .qa__q::after {
  content: "+";
  flex: none;
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 500;
  line-height: 1.4;
  color: var(--amber);
  transition: color .2s var(--ease);
}

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

.page-faq .qa__a {
  max-width: 60ch;
  padding: 0 clamp(6px, 1.6vw, 14px) clamp(16px, 2.2vw, 22px) 0;
}

.page-faq .qa__a p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--graphite);
}

.page-faq .qa__a p + p {
  margin-top: 10px;
}

/* ---------- 三步操作 ---------- */
.page-faq .step-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3vw, 32px);
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .step {
  position: relative;
  padding-top: 22px;
  border-top: 2px solid var(--line-strong);
  transition: border-color .45s var(--ease);
}

.page-faq .step.is-visible {
  border-top-color: var(--amber);
}

.page-faq .step__num {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--shaba);
}

.page-faq .step__title {
  margin: 0 0 12px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
}

.page-faq .step__actions {
  margin: 0;
  padding-left: 20px;
  list-style: decimal;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--readable-mist);
}

.page-faq .step__actions li + li {
  margin-top: 4px;
}

/* ---------- 深色收尾块 ---------- */
.page-faq .faq-block--dark {
  padding: clamp(28px, 4vw, 44px);
  background: var(--graphite);
  color: var(--on-dark);
  border-bottom: 0;
}

.page-faq .faq-block--dark .eyebrow {
  color: var(--gold);
}

.page-faq .faq-block--dark .section-title {
  color: var(--paper);
  border-color: var(--gold);
}

.page-faq .faq-block--dark .section-title::after {
  background: var(--gold);
}

.page-faq .faq-block--dark .body-text {
  color: var(--on-dark);
}

.page-faq .faq-block--dark .body-text a {
  color: var(--gold);
  border-bottom-color: var(--gold);
}

.page-faq .ask-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .ask-list li {
  padding-top: 10px;
  border-top: 1px solid rgba(246, 244, 239, .18);
  font-size: 14px;
  line-height: 1.7;
  color: var(--on-dark);
}

.page-faq .ask-list__k {
  display: block;
  margin-bottom: 3px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--gold);
}

.page-faq .faq-contact__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 20px;
  margin-top: clamp(22px, 3vw, 30px);
}

.page-faq .faq-contact__mail {
  font-family: var(--font-mono);
  font-size: 13.5px;
  letter-spacing: .02em;
  color: var(--gold);
  word-break: break-all;
}

.page-faq .faq-contact__foot {
  margin-top: 20px;
  font-size: 13.5px;
}

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-faq .concept-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(18px, 3vw, 34px);
  }

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

@media (min-width: 820px) {
  .page-faq .step-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-faq .faq-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
    gap: clamp(32px, 4vw, 56px);
  }

  .page-faq .faq-body {
    grid-template-columns: minmax(180px, 208px) minmax(0, 1fr);
    gap: clamp(40px, 5vw, 76px);
  }

  .page-faq .faq-rail {
    position: sticky;
    top: clamp(88px, 12vh, 124px);
    align-self: start;
  }

  .page-faq .faq-rail__list {
    grid-template-columns: 1fr;
    gap: 2px;
  }

  .page-faq .faq-rail__link {
    padding: 9px 12px;
    border-left: 2px solid transparent;
    border-bottom: 1px solid var(--line);
  }
}

@media (min-width: 1280px) {
  .page-faq .faq-body {
    grid-template-columns: 216px minmax(0, 1fr);
  }
}

/* ---------- 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-faq .qa::before,
  .page-faq .qa__q::after,
  .page-faq .step,
  .page-faq .faq-rail__link,
  .page-faq .breadcrumb a {
    transition: none;
  }

  .page-faq .qa::before {
    transform: scaleY(1);
    opacity: 0;
  }

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