.page-faq {
  position: relative;
}

/* ---------- 首屏 ---------- */
.page-faq .kb-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(48px, 8vw, 104px) 0 clamp(34px, 5vw, 64px);
  background:
    radial-gradient(760px 380px at 84% 6%, rgba(56, 242, 222, .12), transparent 64%),
    radial-gradient(680px 460px at 2% 94%, rgba(107, 75, 255, .20), transparent 70%),
    linear-gradient(172deg, var(--c-deep) 0%, var(--c-nebula) 100%);
  border-bottom: 1px solid var(--c-line-faint);
}

.page-faq .kb-hero::after {
  content: "";
  position: absolute;
  inset: -10% -6%;
  background-image:
    linear-gradient(114deg, transparent 0 49.55%, rgba(56, 242, 222, .07) 49.55% 50.45%, transparent 50.45% 100%),
    linear-gradient(68deg, transparent 0 49.6%, rgba(59, 90, 150, .12) 49.6% 50.4%, transparent 50.4% 100%);
  pointer-events: none;
}

.page-faq .kb-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(18px, 2.6vw, 30px);
}

.page-faq .kb-hero__eyebrow {
  margin: 0;
}

.page-faq .kb-hero h1 {
  margin: 0;
  font-family: var(--f-head);
  font-size: clamp(var(--fs-32), 5.6vw, var(--fs-72));
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--c-white);
}

.page-faq .kb-hero__lede {
  margin: 0;
  max-width: 46ch;
  font-size: var(--fs-16);
  line-height: 1.78;
  color: var(--c-silver);
}

/* 章节目录胶囊 */
.page-faq .kb-jump {
  list-style: none;
  margin: clamp(6px, 1.4vw, 14px) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-faq .kb-jump a {
  display: inline-flex;
  align-items: baseline;
  gap: 9px;
  padding: 9px 15px;
  border: 1px solid var(--c-line-soft);
  border-radius: 999px;
  background: var(--c-glass);
  color: var(--c-silver);
  font-size: var(--fs-14);
  text-decoration: none;
  transition: border-color .24s var(--ease), background .24s var(--ease), color .24s var(--ease);
}

.page-faq .kb-jump a:hover,
.page-faq .kb-jump a:focus-visible {
  border-color: var(--c-cyan);
  background: var(--c-glass-2);
  color: var(--c-white);
  outline: none;
}

.page-faq .kb-jump__no {
  font-family: var(--f-mono);
  font-size: var(--fs-12);
  letter-spacing: .06em;
  color: var(--c-cyan);
}

/* ---------- 章节 ---------- */
.page-faq .kb-chapter {
  counter-reset: qa;
  padding: clamp(44px, 6.4vw, 92px) 0;
  border-bottom: 1px solid var(--c-line-faint);
}

.page-faq .kb-chapter--nebula {
  background: linear-gradient(180deg, var(--c-nebula) 0%, rgba(5, 8, 28, .88) 100%);
  border-top: 1px solid var(--c-line-faint);
}

.page-faq .chapter-head {
  border-left: 3px solid var(--c-cyan);
  padding-left: clamp(14px, 2.2vw, 26px);
  max-width: 60ch;
}

.page-faq .chapter-title {
  margin: 10px 0 0;
  font-family: var(--f-head);
  font-size: clamp(var(--fs-26), 3.3vw, var(--fs-40));
  font-weight: 700;
  line-height: 1.16;
  letter-spacing: -0.015em;
  color: var(--c-white);
}

.page-faq .chapter-lede {
  margin: 14px 0 0;
  max-width: 46ch;
  font-size: var(--fs-16);
  line-height: 1.78;
  color: var(--c-silver);
}

.page-faq .chapter-body {
  margin-top: clamp(24px, 3.4vw, 44px);
  display: grid;
  gap: clamp(22px, 3vw, 40px);
}

.page-faq .chapter-body > * {
  min-width: 0;
}

.page-faq .chapter-foot {
  margin: clamp(22px, 3vw, 34px) 0 0;
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--c-silver);
}

/* ---------- 三步路径 ---------- */
.page-faq .steps {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-faq .step {
  position: relative;
  padding: 0 0 26px 46px;
}

.page-faq .step:last-child {
  padding-bottom: 0;
}

.page-faq .step::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 32px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(180deg, rgba(56, 242, 222, .62), rgba(59, 90, 150, .16));
}

.page-faq .step:last-child::before {
  display: none;
}

.page-faq .step__dot {
  position: absolute;
  left: 0;
  top: 0;
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border: 1px solid var(--c-cyan);
  border-radius: 50%;
  background: rgba(56, 242, 222, .10);
  color: var(--c-cyan);
  font-family: var(--f-mono);
  font-size: var(--fs-12);
  font-weight: 600;
}

.page-faq .step__title {
  margin: 0;
  font-size: var(--fs-18);
  font-weight: 700;
  line-height: 1.42;
  color: var(--c-white);
}

.page-faq .step__text {
  margin: 6px 0 0;
  font-size: var(--fs-16);
  line-height: 1.72;
  color: var(--c-silver);
}

.page-faq .step__hint {
  display: block;
  max-height: 0;
  margin-top: 0;
  overflow: hidden;
  opacity: 0;
  font-size: var(--fs-14);
  line-height: 1.66;
  color: var(--c-cyan);
  transition: max-height .34s var(--ease), opacity .26s var(--ease), margin-top .34s var(--ease);
}

.page-faq .step:hover .step__hint,
.page-faq .step:focus-within .step__hint {
  max-height: 6em;
  margin-top: 8px;
  opacity: 1;
}

/* ---------- 图 ---------- */
.page-faq .kb-figure {
  margin: 0;
  border: 1px solid var(--c-line-faint);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--c-stand);
  box-shadow: 0 26px 64px -36px rgba(5, 8, 28, .95);
}

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

/* ---------- 问答 ---------- */
.page-faq .qa-list {
  margin-top: clamp(28px, 4vw, 48px);
  display: grid;
  gap: 0;
}

.page-faq .qa-list--first {
  margin-top: clamp(24px, 3.4vw, 44px);
}

.page-faq .qa-list--flush {
  margin-top: 0;
}

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

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

.page-faq .qa summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 12px;
  align-items: baseline;
  padding: 17px 0;
  list-style: none;
  cursor: pointer;
  font-size: var(--fs-18);
  font-weight: 600;
  line-height: 1.5;
  color: var(--c-white);
  transition: color .22s var(--ease);
}

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

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

.page-faq .qa summary:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 5px;
}

.page-faq .qa__no {
  font-family: var(--f-mono);
  font-size: var(--fs-12);
  font-weight: 500;
  letter-spacing: .08em;
  color: var(--c-cyan);
}

.page-faq .qa__no::before {
  content: counter(qa, decimal-leading-zero);
}

.page-faq .qa summary::after {
  content: "+";
  font-family: var(--f-mono);
  font-size: var(--fs-18);
  line-height: 1;
  color: var(--c-cyan);
}

.page-faq .qa[open] summary::after {
  content: "–";
}

.page-faq .qa__body {
  padding: 0 0 20px;
}

.page-faq .qa__body p {
  margin: 0;
  font-size: var(--fs-16);
  line-height: 1.78;
  color: var(--c-silver);
}

.page-faq .qa__body p + p {
  margin-top: 10px;
}

/* ---------- 窄屏与桌面栅格 ---------- */
@media (max-width: 719px) {
  .page-faq .kb-jump a {
    padding: 8px 13px;
    font-size: var(--fs-12);
    gap: 7px;
  }

  .page-faq .qa summary {
    gap: 10px;
    font-size: var(--fs-16);
  }

  .page-faq .step {
    padding-left: 40px;
  }
}

@media (min-width: 720px) {
  .page-faq .qa__body {
    padding-left: 42px;
    max-width: 44em;
  }
}

@media (min-width: 860px) {
  .page-faq .kb-hero__inner {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    column-gap: clamp(20px, 2.6vw, 36px);
    row-gap: clamp(20px, 2.8vw, 36px);
    align-items: start;
  }

  .page-faq .kb-hero__eyebrow {
    grid-column: 1 / -1;
  }

  .page-faq .kb-hero h1 {
    grid-column: 1 / 8;
  }

  .page-faq .kb-hero__lede {
    grid-column: 8 / -1;
    padding-top: 10px;
  }

  .page-faq .kb-jump {
    grid-column: 1 / -1;
  }
}

@media (min-width: 880px) {
  .page-faq .chapter-body--entry {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }
}

@media (min-width: 980px) {
  .page-faq .chapter-body--refresh {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }
}