.page-faq {
  --faq-sticky: 96px;
  --faq-gap: clamp(18px, 2.6vw, 34px);
  background: var(--ink-deep);
  color: var(--ice);
  padding-bottom: clamp(44px, 6vw, 88px);
}

.page-faq .section {
  padding-block: clamp(30px, 4.4vw, 64px);
}

.page-faq .faq-visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* 章节标题组 */
.page-faq .faq-head {
  max-width: 68ch;
}

.page-faq .faq-h2 {
  font-size: clamp(1.55rem, 3.4vw, 2.55rem);
  line-height: 1.16;
  letter-spacing: -0.01em;
  margin: 10px 0 0;
}

.page-faq .faq-h3 {
  font-size: clamp(1.35rem, 2.6vw, 1.95rem);
  line-height: 1.2;
  margin: 10px 0 0;
}

.page-faq .faq-sub {
  margin: 14px 0 0;
  color: var(--fog);
  font-size: 0.98rem;
  line-height: 1.75;
  max-width: 62ch;
}

/* 首屏 */
.page-faq .faq-hero {
  padding-top: clamp(18px, 3vw, 34px);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--faq-gap);
  margin-top: clamp(20px, 3vw, 34px);
}

.page-faq .faq-hero-main .display {
  margin: 12px 0 0;
  line-height: 1.02;
}

.page-faq .faq-hero-main .lede {
  margin-top: 18px;
  color: var(--ice);
  opacity: 0.92;
  max-width: 60ch;
}

.page-faq .faq-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-faq .faq-hero-side {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  align-self: end;
}

.page-faq .faq-stat {
  background: var(--ink-polar);
  padding: 14px 12px 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-faq .faq-stat-num {
  font-size: clamp(1.5rem, 4.4vw, 2.2rem);
  line-height: 1;
  color: var(--cyan);
}

.page-faq .faq-stat-label {
  font-size: 0.74rem;
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: var(--fog);
}

/* 双入口 */
.page-faq .faq-duo {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin-top: clamp(20px, 3vw, 30px);
}

.page-faq .faq-duo-card {
  background: var(--ink-polar);
  padding: clamp(20px, 3vw, 34px);
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: background 200ms var(--ease), box-shadow 200ms var(--ease);
}

.page-faq .faq-duo-card h3 {
  margin: 0;
  font-family: var(--font-title);
  font-size: clamp(1.2rem, 2.4vw, 1.6rem);
  letter-spacing: 0.02em;
}

.page-faq .faq-duo-card p {
  margin: 0;
  color: var(--fog);
  font-size: 0.95rem;
  line-height: 1.75;
}

.page-faq .faq-duo-card--alt {
  background: var(--teal-deep);
}

.page-faq .faq-duo-idx {
  font-size: clamp(2rem, 5vw, 3rem);
  line-height: 0.9;
  color: var(--cyan);
  opacity: 0.7;
}

.page-faq .faq-duo-go {
  margin-top: 6px;
  align-self: flex-start;
  font-family: var(--font-title);
  font-size: 0.86rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-live);
  padding-bottom: 4px;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-faq .faq-duo-card:hover,
.page-faq .faq-duo-card:focus-within {
  box-shadow: inset 0 0 0 1px var(--line-live);
}

.page-faq .faq-duo-go:hover,
.page-faq .faq-duo-go:focus-visible {
  color: var(--amber);
  border-color: var(--amber);
}

.page-faq .faq-duo-go:focus-visible,
.page-faq .faq-index-list a:focus-visible,
.page-faq .faq-inline-link:focus-visible {
  outline: 3px solid var(--amber);
  outline-offset: 2px;
}

/* 宽幅流程图 */
.page-faq .faq-flow {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--ink-polar);
}

.page-faq .faq-flow img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-faq .faq-flow figcaption {
  border-top: 1px solid var(--line);
  padding: 12px 16px;
  font-family: var(--font-serif);
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--fog);
}

/* 现象索引双栏 */
.page-faq .faq-index {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3vw, 40px);
  margin-top: clamp(22px, 3vw, 34px);
}

.page-faq .faq-index-side {
  border-left: 2px solid var(--line-live);
  padding-left: 16px;
  display: grid;
  gap: 22px;
}

.page-faq .faq-index-title {
  margin: 0 0 10px;
  font-family: var(--font-title);
  font-size: 0.8rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-faq .faq-index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-faq .faq-index-list a {
  display: grid;
  grid-template-columns: 26px 1fr;
  gap: 8px;
  align-items: baseline;
  color: var(--fog);
  font-size: 0.9rem;
  line-height: 1.5;
  text-decoration: none;
  padding: 3px 0;
  transition: color 160ms var(--ease);
}

.page-faq .faq-index-list .num {
  font-size: 0.76rem;
  color: var(--cyan);
}

.page-faq .faq-index-list a:hover {
  color: var(--ice);
}

.page-faq .faq-entries {
  display: grid;
  gap: 10px;
  min-width: 0;
}

/* 折叠条目 */
.page-faq .faq-entry {
  border: 1px solid var(--line);
  background: var(--ink-polar);
  transition: border-color 180ms var(--ease);
}

.page-faq .faq-entry[open] {
  border-color: var(--line-live);
  background: var(--ink-deep);
}

.page-faq .faq-entry > summary {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 12px;
  align-items: baseline;
  padding: 14px clamp(14px, 2vw, 20px);
  cursor: pointer;
  list-style: none;
  transition: background 180ms var(--ease);
}

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

.page-faq .faq-entry > summary::marker {
  content: "";
}

.page-faq .faq-entry > summary:hover {
  background: var(--teal-deep);
}

.page-faq .faq-entry > summary:focus-visible {
  outline: 3px solid var(--amber);
  outline-offset: -3px;
}

.page-faq .faq-entry-num {
  font-size: 0.78rem;
  color: var(--cyan);
}

.page-faq .faq-entry-title {
  font-size: 0.98rem;
  line-height: 1.55;
  color: var(--ice);
}

.page-faq .faq-entry-mark {
  position: relative;
  width: 12px;
  height: 12px;
  align-self: center;
}

.page-faq .faq-entry-mark::before,
.page-faq .faq-entry-mark::after {
  content: "";
  position: absolute;
  background: var(--cyan);
  transition: transform 180ms var(--ease), opacity 180ms var(--ease);
}

.page-faq .faq-entry-mark::before {
  left: 0;
  top: 5px;
  width: 12px;
  height: 2px;
}

.page-faq .faq-entry-mark::after {
  left: 5px;
  top: 0;
  width: 2px;
  height: 12px;
}

.page-faq .faq-entry[open] .faq-entry-mark::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-faq .faq-entry-body {
  padding: 2px clamp(14px, 2vw, 20px) 18px;
  border-top: 1px solid var(--line);
  margin-top: 2px;
}

.page-faq .faq-entry-body p {
  margin: 12px 0 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--fog);
}

.page-faq .faq-label {
  display: inline-block;
  min-width: 42px;
  margin-right: 10px;
  font-family: var(--font-title);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-faq .faq-label--go {
  color: var(--amber);
}

/* 三步自查 */
.page-faq .faq-steps {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-faq .faq-steps li {
  background: var(--ink-polar);
  padding: clamp(18px, 2.6vw, 30px);
}

.page-faq .faq-steps h3 {
  margin: 10px 0 0;
  font-family: var(--font-title);
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  line-height: 1.3;
  letter-spacing: 0.01em;
}

.page-faq .faq-steps p {
  margin: 10px 0 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--fog);
}

.page-faq .faq-step-num {
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-faq .faq-tip {
  margin-top: 22px;
  border-left: 3px solid var(--alert);
  background: var(--teal-deep);
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-faq .faq-tip p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--ice);
}

.page-faq .faq-tip .tag {
  align-self: flex-start;
}

/* 问答分组 */
.page-faq .faq-ask-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3.4vw, 46px);
}

.page-faq .faq-ask-head p {
  margin: 14px 0 0;
  color: var(--fog);
  font-size: 0.95rem;
  line-height: 1.8;
  max-width: 46ch;
}

.page-faq .faq-ask-head .btn {
  margin-top: 20px;
}

.page-faq .faq-ask-list {
  display: grid;
  gap: 10px;
  align-content: start;
  min-width: 0;
}

.page-faq .faq-ask-figure {
  margin: 22px 0 0;
  border: 1px solid var(--line);
  background: var(--ink-polar);
}

.page-faq .faq-ask-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-faq .faq-inline-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-live);
  padding-bottom: 2px;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-faq .faq-inline-link:hover {
  color: var(--amber);
  border-color: var(--amber);
}

/* 客服 */
.page-faq .faq-contact-card {
  border: 1px solid var(--line-live);
  background: linear-gradient(155deg, var(--indigo) 0%, var(--ink-deep) 62%, var(--ink-deep) 100%);
  padding: clamp(22px, 3.6vw, 46px);
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3vw, 40px);
}

.page-faq .faq-contact-lead p {
  margin: 14px 0 0;
  color: var(--fog);
  font-size: 0.95rem;
  line-height: 1.85;
  max-width: 48ch;
}

.page-faq .faq-contact-lead .btn {
  margin-top: 22px;
}

.page-faq .faq-contact-list {
  margin: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  align-content: start;
}

.page-faq .faq-contact-list > div {
  background: var(--ink-deep);
  padding: 12px 14px;
  display: grid;
  gap: 4px;
}

.page-faq .faq-contact-list dt {
  font-family: var(--font-title);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fog);
}

.page-faq .faq-contact-list dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1.5;
  color: var(--ice);
  word-break: break-word;
}

/* 中屏 */
@media (min-width: 620px) {
  .page-faq .faq-contact-list > div {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 14px;
    align-items: baseline;
  }
}

/* 桌面：双栏对照与侧边目录 */
@media (min-width: 900px) {
  .page-faq .faq-hero-grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(250px, 0.6fr);
    align-items: end;
  }

  .page-faq .faq-duo {
    grid-template-columns: 1fr 1fr;
  }

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

  .page-faq .faq-tip {
    flex-direction: row;
    align-items: center;
    gap: 18px;
  }

  .page-faq .faq-tip .tag {
    align-self: center;
    flex: 0 0 auto;
  }

  .page-faq .faq-index {
    grid-template-columns: minmax(212px, 268px) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-index-side {
    position: sticky;
    top: var(--faq-sticky);
    max-height: calc(100vh - var(--faq-sticky) - 32px);
    overflow-y: auto;
    overscroll-behavior: contain;
  }

  .page-faq .faq-ask-grid {
    grid-template-columns: minmax(240px, 320px) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-ask-head {
    position: sticky;
    top: var(--faq-sticky);
  }

  .page-faq .faq-ask--flip .faq-ask-head {
    order: 2;
  }

  .page-faq .faq-ask--flip .faq-ask-list {
    order: 1;
  }

  .page-faq .faq-contact-card {
    grid-template-columns: minmax(0, 1.05fr) minmax(300px, 0.95fr);
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-duo-card,
  .page-faq .faq-entry,
  .page-faq .faq-entry > summary,
  .page-faq .faq-entry-mark::before,
  .page-faq .faq-entry-mark::after,
  .page-faq .faq-duo-go,
  .page-faq .faq-inline-link {
    transition: none;
  }
}
<<<END>>>