.page-faq {
  --faq-index-w: 268px;
  --faq-panel-line: rgba(42, 58, 85, .68);
}

/* ---------- 面包屑 ---------- */
.page-faq .breadcrumb {
  padding: clamp(18px, 3vw, 34px) 0 0;
  font-family: var(--font-data);
  font-size: 12.5px;
  letter-spacing: .05em;
  color: var(--dim);
}

/* ---------- 首屏 ---------- */
.page-faq .kb-hero {
  position: relative;
  overflow: hidden;
  margin-top: clamp(16px, 2.4vw, 28px);
  padding: clamp(24px, 4.4vw, 58px) 0 clamp(26px, 4vw, 50px);
  background:
    linear-gradient(180deg, rgba(12, 20, 40, .92) 0%, rgba(5, 7, 14, 0) 100%);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-faq .kb-hero__ring {
  position: absolute;
  top: -110px;
  right: -90px;
  width: 360px;
  height: 360px;
  border-radius: 50%;
  border: 1px solid var(--line);
  box-shadow:
    0 0 0 42px rgba(34, 224, 255, .045),
    0 0 0 96px rgba(255, 106, 26, .03);
  pointer-events: none;
}

.page-faq .kb-hero__inner {
  position: relative;
}

.page-faq .kb-hero h1 {
  margin: 12px 0 18px;
  font-family: var(--font-head);
  font-size: clamp(32px, 5.2vw, 62px);
  font-weight: 800;
  line-height: 1.04;
  letter-spacing: -.012em;
  color: var(--text);
  max-width: 20ch;
}

.page-faq .kb-hero__lead {
  max-width: 60ch;
  margin: 0;
  color: var(--dim);
  font-size: var(--fs-body);
  line-height: 1.78;
}

.page-faq .kb-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 26px;
  margin-top: clamp(20px, 3vw, 32px);
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-family: var(--font-data);
  font-size: var(--fs-note);
  letter-spacing: .03em;
  color: var(--dim);
}

.page-faq .kb-hero__meta b {
  color: var(--cyan);
  font-weight: 600;
}

/* ---------- 两栏骨架 ---------- */
.page-faq .kb-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 3.4vw, 52px);
  padding: clamp(28px, 4.4vw, 62px) 0 clamp(40px, 6vw, 96px);
}

@media (min-width: 1000px) {
  .page-faq .kb-layout {
    grid-template-columns: var(--faq-index-w) minmax(0, 1fr);
    align-items: start;
  }
}

/* ---------- 分类索引 ---------- */
.page-faq .kb-index {
  border: 1px solid var(--line);
  background: linear-gradient(180deg, var(--panel) 0%, rgba(5, 7, 14, .9) 100%);
  padding: 16px 16px 6px;
}

@media (min-width: 1000px) {
  .page-faq .kb-index {
    position: sticky;
    top: 104px;
  }
}

.page-faq .kb-index__title {
  margin: 0 0 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--sage);
}

.page-faq .kb-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 14px;
}

@media (min-width: 720px) {
  .page-faq .kb-index__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 1000px) {
  .page-faq .kb-index__list {
    grid-template-columns: 1fr;
    gap: 0;
  }
}

.page-faq .kb-index__link {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 11px 0;
  border-bottom: 1px dashed var(--faq-panel-line);
  color: var(--text);
  text-decoration: none;
  font-size: 15px;
  line-height: 1.4;
  transition: color var(--ease), border-color var(--ease);
}

.page-faq .kb-index__link:hover,
.page-faq .kb-index__link:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
  outline: none;
}

.page-faq .kb-index__link:focus-visible {
  box-shadow: 0 0 0 2px var(--cyan);
}

.page-faq .kb-index__num {
  flex: 0 0 auto;
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--pulse);
}

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

.page-faq .kb-index__count {
  flex: 0 0 auto;
  font-family: var(--font-data);
  font-size: 11.5px;
  color: var(--dim);
}

/* ---------- 问答分组 ---------- */
.page-faq .kb-body {
  min-width: 0;
}

.page-faq .qa-group {
  padding-bottom: clamp(30px, 4vw, 54px);
  margin-bottom: clamp(32px, 4.4vw, 60px);
  border-bottom: 1px solid var(--line);
  scroll-margin-top: 120px;
}

.page-faq .qa-group:last-of-type {
  border-bottom: 0;
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-faq .qa-group__num {
  margin: 0 0 10px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .22em;
  color: var(--pulse);
  padding-left: 12px;
  border-left: 3px solid var(--pulse);
  line-height: 1.2;
}

.page-faq .qa-group__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(24px, 2.9vw, 36px);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -.008em;
  color: var(--text);
  max-width: 24ch;
}

.page-faq .qa-group__lead {
  max-width: 62ch;
  margin: 12px 0 clamp(20px, 2.6vw, 30px);
  color: var(--dim);
  font-size: 15.5px;
  line-height: 1.78;
}

/* ---------- 折叠条目 ---------- */
.page-faq .qa-item {
  border: 1px solid var(--line);
  border-left: 2px solid var(--line);
  background: var(--panel);
  margin-bottom: 10px;
  transition: background var(--ease), border-color var(--ease);
}

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

.page-faq .qa-item[open] {
  background: var(--lift);
  border-left-color: var(--pulse);
}

.page-faq .qa-item > summary {
  position: relative;
  list-style: none;
  cursor: pointer;
  padding: 15px 52px 15px 16px;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.58;
  color: var(--text);
  transition: color var(--ease);
}

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

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

.page-faq .qa-item > summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -3px;
}

.page-faq .qa-item > summary::before {
  content: "";
  position: absolute;
  right: 20px;
  top: 50%;
  width: 9px;
  height: 9px;
  border-right: 1.5px solid var(--cyan);
  border-bottom: 1.5px solid var(--cyan);
  transform: translateY(-65%) rotate(45deg);
  transition: transform var(--ease), border-color var(--ease);
}

.page-faq .qa-item[open] > summary::before {
  border-color: var(--pulse);
  transform: translateY(-25%) rotate(225deg);
}

.page-faq .qa-item__body {
  padding: 14px 18px 18px;
  border-top: 1px dashed var(--faq-panel-line);
  color: var(--dim);
  font-size: 15.5px;
  line-height: 1.78;
}

.page-faq .qa-item__body p {
  margin: 0 0 10px;
}

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

.page-faq .qa-item__body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(34, 224, 255, .4);
  transition: border-color var(--ease), color var(--ease);
}

.page-faq .qa-item__body a:hover,
.page-faq .qa-item__body a:focus-visible {
  color: var(--text);
  border-bottom-color: var(--pulse);
}

.page-faq .fmt-line {
  display: inline-block;
  padding: 2px 9px;
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: .05em;
  color: var(--cyan);
  background: rgba(5, 7, 14, .8);
  border: 1px dashed var(--line);
}

/* ---------- 步骤序列 ---------- */
.page-faq .qa-steps {
  counter-reset: faqstep;
  list-style: none;
  margin: 14px 0 12px;
  padding: 0;
}

.page-faq .qa-steps li {
  counter-increment: faqstep;
  position: relative;
  padding: 0 0 14px 46px;
  line-height: 1.72;
}

.page-faq .qa-steps li::before {
  content: counter(faqstep, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 1px;
  width: 22px;
  font-family: var(--font-data);
  font-size: 12.5px;
  letter-spacing: .05em;
  color: var(--pulse);
}

.page-faq .qa-steps li::after {
  content: "";
  position: absolute;
  left: 24px;
  top: 22px;
  bottom: 0;
  width: 1px;
  background: var(--line);
}

.page-faq .qa-steps li:last-child {
  padding-bottom: 0;
}

.page-faq .qa-steps li:last-child::after {
  display: none;
}

/* ---------- 配图 ---------- */
.page-faq .kb-figure {
  margin: clamp(20px, 2.8vw, 30px) 0 0;
  border: 1px solid var(--line);
  background: var(--panel);
}

.page-faq .kb-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.82) contrast(1.06);
}

.page-faq .kb-figure figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  font-family: var(--font-data);
  font-size: 12.5px;
  letter-spacing: .02em;
  color: var(--dim);
  line-height: 1.6;
}

/* ---------- 收束 ---------- */
.page-faq .kb-outro {
  margin-top: clamp(10px, 2vw, 20px);
  padding: clamp(22px, 3.4vw, 40px);
  border: 1px solid var(--line);
  border-top: 2px solid var(--pulse);
  background: linear-gradient(155deg, rgba(19, 30, 58, .92) 0%, rgba(5, 7, 14, .96) 100%);
}

.page-faq .kb-outro h2 {
  margin: 10px 0 12px;
  font-family: var(--font-head);
  font-size: clamp(22px, 2.6vw, 30px);
  font-weight: 800;
  line-height: 1.2;
  color: var(--text);
}

.page-faq .kb-outro p {
  max-width: 58ch;
  margin: 0 0 20px;
  color: var(--dim);
  font-size: 15.5px;
  line-height: 1.78;
}

.page-faq .kb-outro__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 窄屏收口 ---------- */
@media (max-width: 560px) {
  .page-faq .kb-index__list {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .page-faq .qa-item > summary {
    padding: 14px 46px 14px 14px;
    font-size: 15.5px;
  }

  .page-faq .qa-item__body {
    padding: 13px 14px 16px;
    font-size: 15px;
  }

  .page-faq .qa-steps li {
    padding-left: 38px;
  }

  .page-faq .qa-steps li::after {
    left: 20px;
  }

  .page-faq .kb-outro__actions .btn {
    flex: 1 1 auto;
    text-align: center;
  }
}