.page-faq {
  --faq-gap: clamp(1.25rem, 3vw, 2.25rem);
  background: var(--bg-base);
  color: var(--paper);
  padding-bottom: clamp(2.5rem, 6vw, 4.5rem);
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(1.75rem, 4.5vw, 3rem) clamp(1.75rem, 4vw, 3rem);
  background:
    radial-gradient(900px 380px at 80% -25%, rgba(0, 229, 212, 0.13), transparent 68%),
    linear-gradient(180deg, var(--bg-deep) 0%, var(--bg-abyss) 100%);
  border-bottom: var(--border-w) solid var(--line);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.4;
  background-image:
    linear-gradient(rgba(30, 58, 95, 0.4) 1px, transparent 1px),
    linear-gradient(90deg, rgba(30, 58, 95, 0.4) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 88%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 88%);
}

.page-faq .faq-hero .container {
  position: relative;
  z-index: 1;
}

.page-faq .faq-hero .breadcrumb {
  margin-bottom: 1.35rem;
}

.page-faq .hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.75rem;
  align-items: end;
}

.page-faq .hero-copy .eyebrow {
  margin: 0;
}

.page-faq .faq-hero h1 {
  margin: 0.4rem 0 1rem;
  font-size: clamp(1.85rem, 6vw, 3.35rem);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -0.02em;
  font-stretch: condensed;
}

.page-faq .faq-hero .lede {
  max-width: 48ch;
  margin: 0;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.85;
}

.page-faq .flow-figure {
  margin: 0;
  padding: 1.1rem 1.1rem 0.85rem;
  border: var(--border-w) solid var(--line);
  background: rgba(15, 30, 51, 0.72);
  box-shadow: var(--shadow-hard);
}

.page-faq .flow-svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-faq .flow-svg .flow-link {
  stroke: var(--line-strong);
  stroke-width: 2;
  stroke-dasharray: 5 5;
}

.page-faq .flow-svg .flow-node rect {
  fill: var(--bg-deep);
  stroke: var(--line-strong);
  stroke-width: 2;
}

.page-faq .flow-svg .flow-node--brand rect {
  stroke: var(--cyan);
}

.page-faq .flow-svg .flow-num {
  fill: var(--cyan);
  font-family: var(--font-num);
  font-size: 20px;
  font-weight: 700;
  text-anchor: middle;
}

.page-faq .flow-svg .flow-label {
  fill: var(--paper);
  font-family: var(--font-sans);
  font-size: 15px;
  text-anchor: middle;
}

.page-faq .flow-figure figcaption {
  margin-top: 0.8rem;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.6;
  letter-spacing: 0.02em;
}

/* ---------- 主体栅格 ---------- */

.page-faq .faq-body {
  padding-block: var(--faq-gap);
}

.page-faq .qa-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.5rem;
}

.page-faq .qa-main {
  min-width: 0;
}

/* ---------- 问题索引 ---------- */

.page-faq .qa-index-label {
  margin: 0 0 0.5rem;
  font-family: var(--font-num);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-faq .qa-index-nav {
  display: flex;
  flex-direction: row;
  gap: 0.4rem;
  overflow-x: auto;
  padding-bottom: 0.4rem;
  scrollbar-width: thin;
}

.page-faq .index-link {
  flex: 0 0 auto;
  display: block;
  padding: 0.45rem 0.65rem;
  border-bottom: 3px solid transparent;
  color: var(--muted);
  font-size: 0.875rem;
  line-height: 1.5;
  white-space: nowrap;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-faq .index-link:hover {
  color: var(--paper);
  border-bottom-color: var(--line-strong);
}

.page-faq .index-link.is-active,
.page-faq .index-link[aria-current="true"],
.page-faq .index-link[aria-current="location"] {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
  background: rgba(0, 229, 212, 0.07);
}

/* ---------- 筛选条 ---------- */

.page-faq .filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  padding-bottom: 1.1rem;
  margin-bottom: 1.6rem;
  border-bottom: 1px solid var(--line);
}

.page-faq .filter-label {
  font-size: 0.82rem;
  color: var(--muted);
  letter-spacing: 0.04em;
}

.page-faq .filter-bar .chip {
  font-size: 0.82rem;
}

.page-faq .filter-bar .chip--reset {
  color: var(--muted);
  border-style: dashed;
}

.page-faq .filter-bar .filter-count {
  margin-left: auto;
  font-family: var(--font-num);
  font-size: 0.78rem;
  color: var(--sage);
  letter-spacing: 0.06em;
}

/* ---------- 章节标题 ---------- */

.page-faq .qa-group + .qa-group {
  margin-top: clamp(2rem, 5vw, 3.25rem);
}

.page-faq .qa-group-head {
  display: grid;
  grid-template-columns: 2.6rem minmax(0, 1fr);
  grid-template-areas:
    "num title"
    "num note";
  column-gap: 0.75rem;
  row-gap: 0.2rem;
  align-items: start;
  padding-bottom: 0.85rem;
  margin-bottom: 1.25rem;
  border-bottom: var(--border-w) solid var(--line);
}

.page-faq .qa-group-num {
  grid-area: num;
  font-size: 1.55rem;
  font-weight: 700;
  line-height: 1.1;
  color: var(--cyan);
  letter-spacing: -0.02em;
}

.page-faq .qa-group-head h2 {
  grid-area: title;
  margin: 0;
  font-size: clamp(1.15rem, 3.4vw, 1.5rem);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

.page-faq .qa-group-note {
  grid-area: note;
  margin: 0;
  color: var(--muted);
  font-size: 0.875rem;
  line-height: 1.65;
}

/* ---------- 配图 ---------- */

.page-faq .qa-figure {
  margin: 0 0 1.25rem;
  border: var(--border-w) solid var(--line);
  background: var(--bg-deep);
}

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

.page-faq .qa-figure .media-caption {
  margin: 0;
  padding: 0.7rem 1rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.84rem;
  line-height: 1.65;
}

/* ---------- 问答条目 ---------- */

.page-faq .qa-list {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .qa-item {
  border: var(--border-w) solid var(--line);
  background: var(--bg-deep);
  transition: border-color 0.22s var(--ease), box-shadow 0.22s var(--ease);
}

.page-faq .qa-item:hover {
  border-color: var(--line-strong);
}

.page-faq .qa-item:has(.qa-details[open]) {
  border-color: var(--line-strong);
  box-shadow: inset 4px 0 0 var(--cyan), var(--shadow-hard);
}

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

.page-faq .qa-details summary {
  list-style: none;
}

.page-faq .qa-q {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.05rem 1.15rem;
  cursor: pointer;
  color: var(--paper);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.6;
  transition: color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-faq .qa-q:hover {
  color: var(--cyan);
  background: rgba(0, 229, 212, 0.05);
}

.page-faq .qa-details[open] > .qa-q {
  color: var(--cyan);
  border-bottom: 1px solid var(--line);
}

.page-faq .qa-q-text {
  flex: 1 1 auto;
}

.page-faq .qa-q-mark {
  position: relative;
  flex: 0 0 auto;
  width: 18px;
  height: 18px;
  margin-top: 0.28rem;
}

.page-faq .qa-q-mark::before,
.page-faq .qa-q-mark::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--cyan);
  transform: translate(-50%, -50%);
  transition: transform 0.22s var(--ease), opacity 0.22s var(--ease);
}

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

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

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

.page-faq .qa-a {
  padding: 1.05rem 1.15rem 1.35rem;
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.8;
}

.page-faq .qa-a p {
  margin: 0 0 0.85rem;
}

.page-faq .qa-a p:last-child {
  margin-bottom: 0;
}

.page-faq .qa-a strong {
  color: var(--paper);
  font-weight: 700;
}

.page-faq .qa-a a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

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

/* ---------- 步骤清单 ---------- */

.page-faq .qa-steps {
  display: flex;
  flex-direction: column;
  gap: 0.62rem;
  margin: 0.55rem 0 0;
  padding: 0;
  list-style: none;
  counter-reset: qa-step;
}

.page-faq .qa-steps li {
  display: grid;
  grid-template-columns: 2.1rem minmax(0, 1fr);
  gap: 0.7rem;
  align-items: start;
  counter-increment: qa-step;
}

.page-faq .qa-steps li::before {
  content: counter(qa-step, decimal-leading-zero);
  font-family: var(--font-num);
  font-size: 0.76rem;
  font-weight: 700;
  line-height: 1.5;
  text-align: center;
  color: var(--cyan);
  border: 1px solid var(--line-strong);
  padding: 0.15rem 0;
}

/* ---------- 勾选清单 ---------- */

.page-faq .qa-checklist {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin: 0.35rem 0 1rem;
  padding: 0;
  list-style: none;
}

.page-faq .qa-checklist li {
  position: relative;
  padding-left: 1.5rem;
  line-height: 1.75;
}

.page-faq .qa-checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 10px;
  height: 10px;
  border: 2px solid var(--sage);
}

/* ---------- 两列对照 ---------- */

.page-faq .qa-compare {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.7rem;
  margin-top: 0.6rem;
}

.page-faq .compare-col {
  padding: 0.9rem 1rem;
  border: 1px solid var(--line);
  background: var(--panel);
}

.page-faq .compare-col--brand {
  border-color: var(--line-strong);
  box-shadow: inset 0 0 0 1px rgba(0, 229, 212, 0.28);
}

.page-faq .compare-head {
  margin: 0;
  font-family: var(--font-num);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--sage);
}

.page-faq .compare-col--brand .compare-head {
  color: var(--cyan);
}

.page-faq .compare-col ul {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin: 0.6rem 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .compare-col li {
  position: relative;
  padding-left: 0.95rem;
  font-size: 0.9rem;
  line-height: 1.72;
}

.page-faq .compare-col li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 6px;
  height: 2px;
  background: var(--cyan);
}

.page-faq .compare-col:not(.compare-col--brand) li::before {
  background: var(--sage);
}

/* ---------- 尾部引导 ---------- */

.page-faq .qa-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.85rem;
  margin-top: 1.35rem;
  padding: 1.05rem 1.15rem;
  border: var(--border-w) solid var(--cyan);
  background: rgba(0, 229, 212, 0.07);
}

.page-faq .qa-cta p {
  flex: 1 1 15rem;
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--paper);
}

.page-faq .qa-cta .btn {
  flex: 0 0 auto;
}

/* ---------- 响应式 ---------- */

@media (min-width: 700px) {
  .page-faq .qa-compare {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .qa-q {
    padding: 1.15rem 1.5rem;
  }

  .page-faq .qa-a {
    padding: 1.15rem 1.5rem 1.5rem;
  }
}

@media (min-width: 960px) {
  .page-faq .hero-grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: 3rem;
  }

  .page-faq .qa-layout {
    grid-template-columns: 250px minmax(0, 1fr);
    gap: 3rem;
    align-items: start;
  }

  .page-faq .qa-index {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-faq .qa-index-nav {
    flex-direction: column;
    overflow-x: visible;
    gap: 0.1rem;
    padding-bottom: 0;
  }

  .page-faq .index-link {
    flex: 1 1 auto;
    padding: 0.6rem 0.85rem;
    border-bottom: none;
    border-left: 3px solid transparent;
    white-space: normal;
    font-size: 0.9rem;
  }

  .page-faq .index-link:hover {
    border-bottom-color: transparent;
    border-left-color: var(--line-strong);
  }

  .page-faq .index-link.is-active,
  .page-faq .index-link[aria-current="true"],
  .page-faq .index-link[aria-current="location"] {
    border-bottom-color: transparent;
    border-left-color: var(--cyan);
    background: rgba(0, 229, 212, 0.07);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa-item,
  .page-faq .qa-q,
  .page-faq .qa-q-mark::before,
  .page-faq .qa-q-mark::after,
  .page-faq .index-link {
    transition: none;
  }
}
<<<END>>>