.page-faq {
  display: block;
  background: var(--ink);
  color: var(--sand);
}

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

/* ---------- 首屏 ---------- */

.page-faq .faq-intro {
  position: relative;
  padding: clamp(24px, 5vw, 56px) 0 clamp(40px, 7vw, 72px);
  overflow: hidden;
}

.page-faq .faq-intro::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(58% 68% at 10% -10%, rgba(139, 75, 255, 0.30), transparent 62%),
    radial-gradient(46% 58% at 94% 12%, rgba(43, 231, 214, 0.16), transparent 66%);
  pointer-events: none;
}

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

.page-faq .faq-intro__grid {
  margin-top: clamp(22px, 4vw, 40px);
  align-items: start;
}

.page-faq .faq-intro__lead h1 {
  margin: 12px 0 0;
}

.page-faq .faq-intro__lead .lede {
  margin: 18px 0 0;
  max-width: 46ch;
}

.page-faq .faq-intro__lead .note {
  margin: 14px 0 0;
  max-width: 52ch;
}

.page-faq .faq-intro__card {
  padding: 22px 20px 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(23, 16, 41, 0.92), rgba(11, 12, 18, 0.58));
  box-shadow: 0 22px 46px -32px rgba(139, 75, 255, 0.75);
}

.page-faq .toc {
  list-style: none;
  margin: 16px 0 20px;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-faq .toc li {
  margin: 0;
}

.page-faq .toc .index-link {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 9px 0;
  border-bottom: 1px dashed var(--line-soft);
  color: var(--sand);
  text-decoration: none;
  font-size: 0.95rem;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease);
}

.page-faq .toc .index-link:hover,
.page-faq .toc .index-link:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-faq .toc .index-link[aria-current="true"] {
  color: var(--cyan);
}

.page-faq .toc .index-link__num {
  color: var(--violet);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
}

.page-faq .toc__label {
  flex: 1 1 auto;
  min-width: 0;
}

.page-faq .faq-intro__cta {
  width: 100%;
  justify-content: center;
}

/* ---------- 章节通用 ---------- */

.page-faq .steps-section {
  padding: clamp(36px, 6vw, 72px) 0 clamp(40px, 7vw, 84px);
  border-top: 1px solid var(--line-soft);
}

.page-faq .qa-section {
  padding: clamp(40px, 7vw, 88px) 0 clamp(48px, 8vw, 96px);
  background: linear-gradient(180deg, rgba(14, 59, 58, 0.42), rgba(11, 12, 18, 0) 58%);
}

/* ---------- 四台阶梯 ---------- */

.page-faq .steps-layout {
  display: grid;
  gap: clamp(32px, 5vw, 48px);
  margin-top: clamp(24px, 4vw, 40px);
}

.page-faq .steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
  counter-reset: stepidx;
}

.page-faq .step {
  --step-accent: var(--violet);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: 32px 22px;
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--step-accent);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(23, 16, 41, 0.88), rgba(11, 12, 18, 0.62));
  transition: transform 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-faq .step:hover {
  transform: translateY(-2px);
  border-color: var(--step-accent);
  border-left-color: var(--step-accent);
}

.page-faq .steps > .step:nth-child(1) {
  --step-accent: var(--violet);
  padding-top: 40px;
  padding-bottom: 40px;
}

.page-faq .steps > .step:nth-child(2) {
  --step-accent: var(--cyan);
  padding-top: 32px;
  padding-bottom: 32px;
}

.page-faq .steps > .step:nth-child(3) {
  --step-accent: var(--neon);
  padding-top: 26px;
  padding-bottom: 26px;
}

.page-faq .steps > .step:nth-child(4) {
  --step-accent: var(--lava);
  padding-top: 21px;
  padding-bottom: 21px;
}

.page-faq .step__num {
  font-size: clamp(2rem, 8vw, 3rem);
  line-height: 1;
  color: var(--step-accent);
  opacity: 0.9;
  letter-spacing: 0.02em;
}

.page-faq .step__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
}

.page-faq .step__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.2rem, 3.4vw, 1.55rem);
  letter-spacing: 0.01em;
  color: var(--sand);
}

.page-faq .step__time {
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: var(--step-accent);
  border: 1px solid currentColor;
  border-radius: 999px;
  padding: 2px 10px;
  white-space: nowrap;
}

.page-faq .step__lead {
  margin: 10px 0 0;
  color: rgba(245, 241, 232, 0.82);
  line-height: 1.78;
  font-size: 0.97rem;
}

.page-faq .step__list {
  margin: 12px 0 0;
  padding-left: 1.1em;
  color: rgba(245, 241, 232, 0.7);
  font-size: 0.92rem;
  line-height: 1.72;
}

.page-faq .step__list li + li {
  margin-top: 6px;
}

.page-faq .step__flag {
  margin: 14px 0 0;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--mist);
}

.page-faq .steps-map .media-frame {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: rgba(23, 16, 41, 0.6);
}

.page-faq .steps-map .note {
  margin: 12px 0 0;
}

/* ---------- 下半页：问答 + 粘性术语 ---------- */

.page-faq .faq-lower {
  display: grid;
  gap: clamp(40px, 7vw, 56px);
  align-items: start;
}

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

.page-faq .qa-group {
  margin-top: clamp(28px, 4vw, 40px);
}

.page-faq .qa-group + .qa-group {
  padding-top: clamp(24px, 4vw, 36px);
  border-top: 1px solid var(--line-soft);
}

.page-faq .qa-group__title {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.15rem;
  color: var(--sand);
  letter-spacing: 0.01em;
}

.page-faq .qa-group__note {
  margin: 6px 0 14px;
  font-size: 0.88rem;
  color: var(--mist);
  line-height: 1.7;
}

.page-faq .qa-list {
  border-top: 1px solid var(--line-soft);
}

.page-faq .qa {
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .qa > summary {
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 20px;
  gap: 14px;
  align-items: center;
  padding: 15px 2px;
  color: var(--sand);
  font-weight: 600;
  font-size: 0.99rem;
  line-height: 1.6;
  transition: color 0.16s var(--ease);
}

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

.page-faq .qa > summary:hover {
  color: var(--cyan);
}

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

.page-faq .qa__mark {
  position: relative;
  width: 14px;
  height: 14px;
  justify-self: end;
}

.page-faq .qa__mark::before,
.page-faq .qa__mark::after {
  content: "";
  position: absolute;
  background: var(--cyan);
  transition: transform 0.18s var(--ease), opacity 0.18s var(--ease);
}

.page-faq .qa__mark::before {
  left: 0;
  right: 0;
  top: 6px;
  height: 2px;
}

.page-faq .qa__mark::after {
  top: 0;
  bottom: 0;
  left: 6px;
  width: 2px;
}

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

.page-faq .qa__a {
  padding: 0 2px 18px;
  color: rgba(245, 241, 232, 0.78);
  font-size: 0.94rem;
  line-height: 1.8;
}

.page-faq .qa__a p {
  margin: 0;
}

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

.page-faq .qa-figure {
  margin: 22px 0 0;
}

.page-faq .qa-figure .media-frame {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: rgba(23, 16, 41, 0.6);
}

.page-faq .qa-figure figcaption {
  margin-top: 10px;
}

/* ---------- 术语速查 ---------- */

.page-faq .glossary {
  padding: 22px 20px 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(23, 16, 41, 0.94), rgba(11, 12, 18, 0.7));
}

.page-faq .glossary__head {
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.page-faq .glossary__head h2 {
  margin: 8px 0 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.12rem;
  letter-spacing: 0.01em;
  color: var(--sand);
}

.page-faq .glossary__head p {
  margin: 0;
  font-size: 0.83rem;
  line-height: 1.72;
  color: var(--mist);
}

.page-faq .glossary__group {
  margin-top: 18px;
}

.page-faq .glossary__cat {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-faq .glossary__group:nth-of-type(1) .glossary__cat {
  color: var(--cyan);
}

.page-faq .glossary__group:nth-of-type(2) .glossary__cat {
  color: var(--violet);
}

.page-faq .glossary__group:nth-of-type(3) .glossary__cat {
  color: var(--neon);
}

.page-faq .glossary__group:nth-of-type(4) .glossary__cat {
  color: var(--lava);
}

.page-faq .glossary__list {
  margin: 0;
  display: grid;
  gap: 10px;
}

.page-faq .glossary__item {
  padding-left: 10px;
  border-left: 1px solid var(--line-soft);
}

.page-faq .glossary__item dt {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  color: var(--sand);
}

.page-faq .glossary__item dd {
  margin: 2px 0 0;
  font-size: 0.82rem;
  line-height: 1.66;
  color: var(--mist);
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-faq .step {
    grid-template-columns: 92px minmax(0, 1fr);
    grid-template-rows: auto;
    gap: 0 24px;
    padding-left: 26px;
    padding-right: 26px;
  }

  .page-faq .steps > .step:nth-child(1) {
    padding-top: 44px;
    padding-bottom: 44px;
  }

  .page-faq .steps > .step:nth-child(2) {
    padding-top: 34px;
    padding-bottom: 34px;
  }

  .page-faq .steps > .step:nth-child(3) {
    padding-top: 27px;
    padding-bottom: 27px;
  }

  .page-faq .steps > .step:nth-child(4) {
    padding-top: 22px;
    padding-bottom: 22px;
  }

  .page-faq .step__num {
    grid-column: 1;
    grid-row: 1;
  }

  .page-faq .step__body {
    grid-column: 2;
    grid-row: 1;
    min-width: 0;
  }

  .page-faq .faq-intro__card {
    padding: 26px 24px 28px;
  }
}

@media (min-width: 1024px) {
  .page-faq .steps-layout {
    grid-template-columns: minmax(0, 8fr) minmax(0, 3fr);
    gap: clamp(40px, 5vw, 72px);
  }

  .page-faq .steps-map {
    position: sticky;
    top: calc(var(--bar-h) + 24px);
  }

  .page-faq .faq-lower {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(40px, 5vw, 68px);
  }

  .page-faq .glossary {
    position: sticky;
    top: calc(var(--bar-h) + 24px);
    max-height: calc(100vh - var(--bar-h) - 48px);
    overflow-y: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .step,
  .page-faq .toc .index-link,
  .page-faq .qa > summary,
  .page-faq .qa__mark::before,
  .page-faq .qa__mark::after {
    transition: none;
  }

  .page-faq .step:hover {
    transform: none;
  }
}

</body>
</html>