.page-faq {
  --faq-sticky: 6.5rem;
  --faq-surface: rgba(11, 39, 64, .78);
  padding-bottom: clamp(3rem, 7vw, 5rem);
}

/* ---------- 面包屑 ---------- */
.page-faq .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem;
  padding-top: clamp(1.25rem, 3vw, 2rem);
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .12em;
  color: var(--mist);
}
.page-faq .breadcrumbs a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}
.page-faq .breadcrumbs a:hover,
.page-faq .breadcrumbs a:focus-visible {
  color: var(--mint);
  border-bottom-color: var(--mint);
}
.page-faq .breadcrumbs .sep {
  color: rgba(159, 182, 195, .45);
}
.page-faq .breadcrumbs [aria-current="page"] {
  color: var(--paper);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  display: grid;
  gap: clamp(1.5rem, 4vw, 3rem);
  padding: clamp(1.75rem, 4vw, 3rem) 0 clamp(2rem, 5vw, 3.5rem);
  border-bottom: 1px solid var(--line);
}
.page-faq .faq-hero__main { min-width: 0; }

.page-faq h1 {
  margin: .6rem 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.1rem, 6.2vw, 4.1rem);
  line-height: 1.02;
  letter-spacing: -.015em;
  color: var(--paper);
  max-width: 18ch;
}

.page-faq .faq-hero__main .lede {
  margin-top: 1rem;
  max-width: 60ch;
  color: var(--paper);
  opacity: .84;
  font-size: clamp(.95rem, 1.6vw, 1.05rem);
  line-height: 1.75;
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .65rem;
  margin-top: clamp(1.25rem, 3vw, 1.9rem);
}

.page-faq .faq-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .9rem 1.25rem;
  margin: clamp(1.5rem, 3.5vw, 2.25rem) 0 0;
  padding-top: 1.1rem;
  border-top: 1px dashed var(--line);
}
.page-faq .faq-hero__facts dt {
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .12em;
  color: var(--mist);
  margin-bottom: .25rem;
}
.page-faq .faq-hero__facts dd {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.35rem;
  color: var(--mint);
  line-height: 1.1;
}

/* 五段节点面板 */
.page-faq .faq-nodes {
  align-self: start;
  padding: 1.15rem 1.15rem 1.25rem;
  background: rgba(18, 59, 85, .5);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  backdrop-filter: blur(9px);
  -webkit-backdrop-filter: blur(9px);
  box-shadow: 0 18px 40px -28px rgba(0, 0, 0, .9);
}
.page-faq .faq-nodes__title {
  margin: 0 0 .9rem;
  font-size: .7rem;
  letter-spacing: .16em;
  color: var(--amber);
}
.page-faq .faq-nodes__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.page-faq .faq-nodes__list li {
  display: grid;
  grid-template-columns: 2.1rem minmax(0, 5.5rem) minmax(0, 1fr);
  align-items: baseline;
  gap: .4rem;
  padding: .62rem .35rem;
  background: rgba(7, 26, 43, .82);
  transition: background .2s var(--ease);
}
.page-faq .faq-nodes__list li:hover { background: rgba(18, 59, 85, .92); }
.page-faq .faq-nodes__no {
  font-size: .72rem;
  color: var(--amber);
  letter-spacing: .06em;
}
.page-faq .faq-nodes__name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1rem;
  color: var(--paper);
}
.page-faq .faq-nodes__desc {
  font-size: .78rem;
  color: var(--mist);
  line-height: 1.5;
}
.page-faq .faq-nodes__foot {
  margin: .9rem 0 0;
  font-size: .76rem;
  line-height: 1.65;
  color: var(--mist);
}

/* ---------- 章节通用头部 ---------- */
.page-faq .faq-section-head {
  max-width: 66ch;
  margin-bottom: clamp(1.25rem, 3vw, 2rem);
}
.page-faq .faq-section-head .section-title {
  margin: .55rem 0 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.65rem, 3.6vw, 2.7rem);
  line-height: 1.12;
  color: var(--paper);
}
.page-faq .faq-section-head__note {
  margin: .8rem 0 0;
  font-size: .93rem;
  line-height: 1.75;
  color: var(--paper);
  opacity: .72;
}

/* ---------- 五步操作 ---------- */
.page-faq .faq-steps {
  padding: clamp(2.25rem, 5vw, 3.75rem) 0;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-figure {
  margin: 0 0 clamp(1.25rem, 3vw, 1.9rem);
}
.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--deep);
}

.page-faq .step-list {
  list-style: none;
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.page-faq .step {
  display: flex;
  flex-direction: column;
  gap: .5rem;
  padding: 1.1rem 1rem 1rem;
  background: var(--deep);
  transition: background .22s var(--ease);
}
.page-faq .step:hover,
.page-faq .step:focus-within { background: var(--glass); }
.page-faq .step__num {
  font-size: 1.9rem;
  line-height: 1;
  color: var(--amber);
  font-weight: 500;
}
.page-faq .step__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.12rem;
  letter-spacing: .01em;
  color: var(--paper);
}
.page-faq .step__text {
  margin: 0;
  font-size: .86rem;
  line-height: 1.72;
  color: var(--paper);
  opacity: .76;
}
.page-faq .step__check {
  display: flex;
  align-items: center;
  gap: .5rem;
  margin-top: auto;
  padding-top: .7rem;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .06em;
  color: var(--mist);
  cursor: pointer;
}
.page-faq .step__check input {
  flex: none;
  width: 15px;
  height: 15px;
  accent-color: var(--mint);
  cursor: pointer;
}
.page-faq .step__check input:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: 2px;
}
.page-faq .step__check input:checked + span { color: var(--mint); }

/* ---------- 节点解读 ---------- */
.page-faq .faq-stages {
  padding: clamp(2.25rem, 5vw, 3.75rem) 0;
  border-bottom: 1px solid var(--line);
}
.page-faq .stage-list {
  display: grid;
  gap: clamp(1rem, 2.5vw, 1.4rem);
}
.page-faq .stage {
  position: relative;
  padding: .2rem 0 .2rem 1rem;
  border-left: 2px solid var(--line-strong);
}
.page-faq .stage::before {
  content: "";
  position: absolute;
  left: -5px;
  top: .55rem;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--mint);
}
.page-faq .stage:nth-child(4)::before,
.page-faq .stage:nth-child(5)::before { background: var(--amber); }
.page-faq .stage__tag {
  display: block;
  font-size: .68rem;
  letter-spacing: .16em;
  color: var(--mist);
  margin-bottom: .3rem;
}
.page-faq .stage h3 {
  margin: 0 0 .35rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.12rem;
  color: var(--paper);
}
.page-faq .stage p {
  margin: 0;
  font-size: .86rem;
  line-height: 1.72;
  color: var(--paper);
  opacity: .74;
}

/* ---------- 答案区 ---------- */
.page-faq .answers {
  display: grid;
  gap: clamp(1.5rem, 3.5vw, 2.75rem);
  padding-top: clamp(2.25rem, 5vw, 3.75rem);
}
.page-faq .answers__index { min-width: 0; }
.page-faq .answers__title {
  margin: .55rem 0 1rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.5rem, 3.2vw, 2.1rem);
  line-height: 1.14;
  color: var(--paper);
}
.page-faq .index-nav {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}
.page-faq .index-nav a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .75rem;
  padding: .68rem .8rem;
  background: rgba(18, 59, 85, .36);
  border-left: 2px solid transparent;
  color: var(--paper);
  text-decoration: none;
  font-size: .9rem;
  transition: background .2s var(--ease), border-color .2s var(--ease), color .2s var(--ease), transform .2s var(--ease);
}
.page-faq .index-nav a .mono {
  font-size: .72rem;
  letter-spacing: .1em;
  color: var(--mist);
  transition: color .2s var(--ease);
}
.page-faq .index-nav a:hover,
.page-faq .index-nav a:focus-visible {
  background: rgba(18, 59, 85, .8);
  border-left-color: var(--mint);
  color: var(--mint);
  transform: translateX(2px);
}
.page-faq .index-nav a:hover .mono,
.page-faq .index-nav a:focus-visible .mono { color: var(--mint); }
.page-faq .answers__hint {
  margin: .9rem 0 0;
  font-size: .78rem;
  line-height: 1.65;
  color: var(--mist);
}

.page-faq .answers__body { min-width: 0; }
.page-faq .answer-group {
  scroll-margin-top: var(--faq-sticky);
}
.page-faq .answer-group + .answer-group {
  margin-top: clamp(2rem, 4.5vw, 3rem);
  padding-top: clamp(1.5rem, 3.5vw, 2.25rem);
  border-top: 1px solid var(--line);
}
.page-faq .answer-group__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .5rem .9rem;
  margin-bottom: 1rem;
  padding-bottom: .65rem;
  border-bottom: 1px solid var(--line-strong);
}
.page-faq .answer-group__head h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.25rem, 2.6vw, 1.6rem);
  letter-spacing: .01em;
  color: var(--mint);
}
.page-faq .answer-group__head p {
  margin: 0;
  font-size: .82rem;
  line-height: 1.6;
  color: var(--mist);
}

.page-faq .faq-figure--screen { margin-bottom: 1rem; }

/* 问答折叠卡 */
.page-faq .qa {
  margin-bottom: .6rem;
  background: var(--faq-surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color .2s var(--ease), background .2s var(--ease);
}
.page-faq .qa:hover { border-color: var(--line-strong); }
.page-faq .qa[open] {
  background: rgba(18, 59, 85, .82);
  border-color: rgba(45, 242, 196, .45);
}
.page-faq .qa summary {
  display: flex;
  align-items: flex-start;
  gap: .7rem;
  padding: .95rem 1rem;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.02rem;
  line-height: 1.4;
  color: var(--paper);
  transition: color .2s var(--ease);
}
.page-faq .qa summary::-webkit-details-marker { display: none; }
.page-faq .qa summary::marker { content: ""; }
.page-faq .qa summary:hover { color: var(--mint); }
.page-faq .qa summary:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: -2px;
}
.page-faq .qa__mark {
  flex: none;
  font-size: .74rem;
  letter-spacing: .08em;
  color: var(--amber);
  padding-top: .18rem;
}
.page-faq .qa__chev {
  flex: none;
  margin-left: auto;
  width: 9px;
  height: 9px;
  margin-top: .42rem;
  border-right: 2px solid var(--mist);
  border-bottom: 2px solid var(--mist);
  transform: rotate(45deg);
  transition: transform .22s var(--ease), border-color .22s var(--ease);
}
.page-faq .qa[open] .qa__chev {
  transform: rotate(-135deg);
  border-color: var(--mint);
}

.page-faq .qa__body {
  padding: 0 1rem 1.05rem 1rem;
  font-size: .89rem;
  line-height: 1.78;
  color: var(--paper);
  opacity: .84;
}
.page-faq .qa__body > p { margin: 0 0 .6rem; }
.page-faq .qa__body > p:last-child { margin-bottom: 0; }
.page-faq .qa__lead {
  padding-left: .7rem;
  border-left: 2px solid var(--mint);
  color: var(--paper);
  opacity: 1;
  font-weight: 500;
}
.page-faq .qa__steps {
  margin: 0 0 .6rem;
  padding-left: 1.15rem;
  display: grid;
  gap: .35rem;
}
.page-faq .qa__steps li::marker {
  font-family: var(--font-mono);
  color: var(--amber);
  font-size: .8rem;
}
.page-faq .qa__link {
  display: inline-block;
  padding-bottom: 1px;
  color: var(--mint);
  text-decoration: none;
  border-bottom: 1px solid rgba(45, 242, 196, .45);
  transition: border-color .2s var(--ease), color .2s var(--ease);
}
.page-faq .qa__link:hover,
.page-faq .qa__link:focus-visible {
  color: var(--amber);
  border-bottom-color: var(--amber);
}

/* ---------- 收尾行动区 ---------- */
.page-faq .faq-cta {
  display: grid;
  gap: clamp(1.25rem, 3vw, 2rem);
  margin-top: clamp(2.5rem, 5vw, 4rem);
  padding: clamp(1.5rem, 4vw, 2.6rem);
  border: 1px solid rgba(255, 178, 74, .3);
  border-radius: var(--radius);
  background:
    radial-gradient(circle at 88% 12%, rgba(45, 242, 196, .18), transparent 55%),
    linear-gradient(135deg, rgba(110, 42, 79, .92), rgba(75, 58, 143, .78) 58%, rgba(18, 59, 85, .9));
}
.page-faq .faq-cta__copy { max-width: 62ch; }
.page-faq .faq-cta__copy .section-title {
  margin: .55rem 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 3.4vw, 2.35rem);
  line-height: 1.1;
  color: var(--paper);
}
.page-faq .faq-cta__copy p:not(.eyebrow) {
  margin: .8rem 0 0;
  font-size: .92rem;
  line-height: 1.75;
  color: var(--paper);
  opacity: .88;
}
.page-faq .faq-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: .65rem;
  align-self: center;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-faq .faq-hero__facts { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .page-faq .step-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .page-faq .stage-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 900px) {
  .page-faq .faq-hero {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, .85fr);
    align-items: start;
  }
  .page-faq .stage-list { grid-template-columns: repeat(5, minmax(0, 1fr)); }
  .page-faq .step-list { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .page-faq .faq-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (min-width: 1020px) {
  .page-faq .step-list { grid-template-columns: repeat(5, minmax(0, 1fr)); }
}

@media (min-width: 1080px) {
  .page-faq .answers {
    grid-template-columns: minmax(0, 258px) minmax(0, 1fr);
    align-items: start;
  }
  .page-faq .answers__index {
    position: sticky;
    top: var(--faq-sticky);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .step,
  .page-faq .qa,
  .page-faq .qa summary,
  .page-faq .qa__chev,
  .page-faq .index-nav a,
  .page-faq .breadcrumbs a {
    transition: none;
  }
}
</main>