.page-faq {
  --faq-rail-w: 300px;
  --faq-mute: rgba(43, 33, 27, 0.68);
  --faq-mute-soft: rgba(43, 33, 27, 0.52);
  background: var(--cream);
  color: var(--ink);
  font-family: var(--font-sans);
}

/* ---------- 面包屑上下文 ---------- */
.page-faq .breadcrumb {
  padding-top: clamp(1rem, 3vw, 1.75rem);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(1.5rem, 3.5vw, 2.5rem) 0 clamp(2.5rem, 6vw, 4.5rem);
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, var(--cream) 0%, var(--cream) 60%, var(--teal-gray) 100%);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  z-index: 0;
  top: -22%;
  right: -16%;
  width: min(62vw, 660px);
  height: min(62vw, 660px);
  background: linear-gradient(146deg, rgba(37, 99, 235, 0.13) 0%, rgba(13, 148, 136, 0.16) 54%, rgba(249, 115, 22, 0.17) 100%);
  clip-path: polygon(26% 0%, 100% 0%, 100% 74%, 0% 100%);
  pointer-events: none;
}

.page-faq .faq-hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.75rem, 4vw, 3rem);
  align-items: end;
}

.page-faq .faq-hero h1 {
  margin: 0.6rem 0 0;
  max-width: 21ch;
  font-size: clamp(1.9rem, 5.4vw, 3.3rem);
  line-height: 1.14;
  font-weight: 800;
  letter-spacing: -0.015em;
  color: var(--ink-blue);
}

.page-faq .faq-lede {
  margin: 1.1rem 0 0;
  max-width: 46ch;
  font-size: clamp(1rem, 1.6vw, 1.1rem);
  line-height: 1.8;
  color: var(--faq-mute);
}

.page-faq .faq-hero-aside {
  border: 1px solid var(--line);
  border-top: 3px solid var(--orange);
  background: var(--white);
  padding: 1.1rem 1.1rem 1.25rem;
  box-shadow: var(--shadow-float);
}

.page-faq .faq-aside-title {
  margin: 0 0 0.85rem;
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--faq-mute-soft);
}

.page-faq .faq-aside-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .faq-aside-list > li {
  background: var(--white);
}

.page-faq .faq-aside-list a {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  padding: 0.8rem 0.3rem;
  font-size: 0.93rem;
  line-height: 1.5;
  color: var(--ink);
  text-decoration: none;
  transition: color 180ms var(--ease), padding-left 180ms var(--ease);
}

.page-faq .faq-aside-list a .mono-label {
  color: var(--teal);
  font-size: 0.74rem;
  flex: none;
}

.page-faq .faq-aside-list a:hover,
.page-faq .faq-aside-list a:focus-visible {
  color: var(--blue);
  padding-left: 0.7rem;
}

/* ---------- 主题索引 ---------- */
.page-faq .faq-index {
  padding: clamp(1.75rem, 4vw, 2.75rem) 0;
  border-bottom: 1px solid var(--line);
  background: var(--mist);
}

.page-faq .faq-index-title {
  margin: 0 0 1rem;
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--faq-mute-soft);
}

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

.page-faq .index-list > li {
  background: var(--white);
}

.page-faq .index-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-areas:
    "num text"
    "num meta";
  gap: 0.1rem 0.85rem;
  align-content: center;
  min-height: 100%;
  padding: 0.95rem 1.1rem;
  color: var(--ink);
  text-decoration: none;
  transition: background 200ms var(--ease), box-shadow 200ms var(--ease);
}

.page-faq .index-num {
  grid-area: num;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.4;
  color: var(--teal);
}

.page-faq .index-text {
  grid-area: text;
  font-size: 0.98rem;
  font-weight: 600;
  line-height: 1.45;
}

.page-faq .index-meta {
  grid-area: meta;
  font-size: 0.76rem;
  color: var(--faq-mute-soft);
}

.page-faq .index-item:hover,
.page-faq .index-item:focus-visible {
  background: var(--teal-wash);
  box-shadow: inset 3px 0 0 var(--teal);
  outline: none;
}

.page-faq .index-item[aria-current="true"] {
  background: var(--blue-wash);
  box-shadow: inset 3px 0 0 var(--blue);
}

/* ---------- 主题簇 ---------- */
.page-faq .faq-cluster {
  padding: clamp(2.25rem, 5vw, 4rem) 0;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-cluster:nth-of-type(even) {
  background: var(--mist);
}

.page-faq .faq-cluster-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.5rem, 3.5vw, 2.5rem);
}

.page-faq .faq-cluster-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  color: var(--vermilion);
}

.page-faq .faq-cluster-title {
  margin: 0.55rem 0 0;
  font-size: clamp(1.35rem, 2.8vw, 1.85rem);
  line-height: 1.24;
  font-weight: 700;
  color: var(--ink-blue);
}

.page-faq .faq-cluster-title::before {
  content: "";
  display: block;
  width: 34px;
  height: 3px;
  margin-bottom: 0.8rem;
  background: var(--teal);
}

.page-faq .faq-cluster-note {
  margin: 0.75rem 0 0;
  font-size: 0.94rem;
  line-height: 1.75;
  color: var(--faq-mute-soft);
}

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

/* ---------- 插图 ---------- */
.page-faq .faq-figure {
  margin: 0 0 1.4rem;
  aspect-ratio: 3 / 2;
  border: 1px solid var(--line);
}

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

/* ---------- 问答条目 ---------- */
.page-faq .faq-q {
  border: 1px solid var(--line);
  border-left: 3px solid var(--line);
  background: var(--white);
  transition: border-color 200ms var(--ease), background 200ms var(--ease), box-shadow 200ms var(--ease);
}

.page-faq .faq-q + .faq-q {
  margin-top: 0.6rem;
}

.page-faq .faq-q[open] {
  border-left-color: var(--teal);
  background: var(--mist);
  box-shadow: 0 14px 30px -28px rgba(31, 42, 46, 0.95);
}

.page-faq .faq-cluster:nth-of-type(even) .faq-q[open] {
  background: var(--white);
  border-left-color: var(--orange);
}

.page-faq .faq-q summary {
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: 2.1rem minmax(0, 1fr) 14px;
  gap: 0.6rem;
  align-items: start;
  padding: 1rem 1.1rem;
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.55;
  color: var(--ink);
  transition: color 180ms var(--ease);
}

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

.page-faq .faq-q summary:hover {
  color: var(--blue);
}

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

.page-faq .q-num {
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  color: var(--vermilion);
  padding-top: 0.3rem;
}

.page-faq .q-text {
  min-width: 0;
}

.page-faq .q-mark {
  position: relative;
  width: 14px;
  height: 14px;
  margin-top: 0.34rem;
  justify-self: end;
}

.page-faq .q-mark::before,
.page-faq .q-mark::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--blue);
  transform: translate(-50%, -50%);
  transition: transform 200ms var(--ease), background 200ms var(--ease);
}

.page-faq .q-mark::before {
  width: 14px;
  height: 2px;
}

.page-faq .q-mark::after {
  width: 2px;
  height: 14px;
}

.page-faq .faq-q[open] .q-mark::before {
  background: var(--teal);
}

.page-faq .faq-q[open] .q-mark::after {
  transform: translate(-50%, -50%) scaleY(0);
}

.page-faq .faq-a {
  margin: 0;
  padding: 0 1.1rem 1.2rem;
  font-size: 0.96rem;
  line-height: 1.8;
  color: var(--faq-mute);
}

.page-faq .faq-a a {
  color: var(--blue);
  text-decoration: underline;
  text-decoration-color: rgba(37, 99, 235, 0.35);
  text-underline-offset: 3px;
  transition: text-decoration-color 180ms var(--ease), color 180ms var(--ease);
}

.page-faq .faq-a a:hover,
.page-faq .faq-a a:focus-visible {
  color: var(--teal);
  text-decoration-color: var(--teal);
}

/* ---------- 桌面栅格 ---------- */
@media (min-width: 640px) {
  .page-faq .faq-a {
    padding-left: calc(1.1rem + 2.1rem + 0.6rem);
    padding-right: 2.2rem;
  }
}

@media (min-width: 720px) {
  .page-faq .index-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero-inner {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    gap: clamp(2rem, 5vw, 4rem);
  }
}

@media (min-width: 960px) {
  .page-faq .faq-cluster-inner {
    grid-template-columns: minmax(0, var(--faq-rail-w)) minmax(0, 1fr);
    gap: clamp(2rem, 5vw, 4.5rem);
    align-items: start;
  }

  .page-faq .faq-cluster-rail {
    position: sticky;
    top: 6.5rem;
  }
}

@media (min-width: 1100px) {
  .page-faq .index-list {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}
<<<END>>>