/* ===== 知识中心 · page-faq ===== */
.page-faq {
  --kb-side-w: 216px;
  --kb-gap: 44px;
  --kb-accent: 3px;
  display: block;
}

.page-faq .kb-wrap {
  padding-top: clamp(18px, 3.6vw, 40px);
  padding-bottom: clamp(52px, 8vw, 96px);
}

/* ---------- 首屏 ---------- */
.page-faq .kb-hero {
  position: relative;
  padding-bottom: clamp(24px, 4vw, 40px);
  border-bottom: 1px solid var(--line);
}

.page-faq .kb-hero::after {
  content: "";
  position: absolute;
  right: 8px;
  top: 4px;
  width: 88px;
  height: 88px;
  border: 1px solid var(--line);
  border-radius: 50%;
  border-right-color: transparent;
  border-bottom-color: transparent;
  transform: rotate(-24deg);
  pointer-events: none;
}

.page-faq .kb-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-stretch: condensed;
  letter-spacing: -0.02em;
  font-size: clamp(28px, 7.4vw, 56px);
  line-height: 1.06;
  margin: 14px 0 0;
  color: var(--text);
}

.page-faq .kb-hero__lead {
  max-width: 42ch;
  margin: clamp(14px, 2.6vw, 22px) 0 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 快速答案带 ---------- */
.page-faq .kb-quick {
  margin-top: clamp(26px, 4.6vw, 46px);
}

.page-faq .kb-quick__title {
  margin: 0 0 16px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--muted);
}

.page-faq .kb-quick__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-faq .kb-quick__item {
  position: relative;
  padding: 18px 18px 20px;
  background: linear-gradient(152deg, var(--panel), rgba(10, 26, 47, 0.92));
  border: 1px solid var(--line-soft);
  border-left: var(--kb-accent) solid var(--cyan);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
}

.page-faq .kb-quick__q {
  margin: 0 0 8px;
  font-size: 15px;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: 0.01em;
}

.page-faq .kb-quick__a {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--text);
}

.page-faq .kb-quick__a a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
}

.page-faq .kb-quick__a a:hover {
  color: var(--red-lift);
  border-bottom-color: var(--red-lift);
}

/* ---------- 双栏骨架 ---------- */
.page-faq .kb-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  margin-top: clamp(34px, 5.6vw, 60px);
}

/* ---------- 左栏分类索引 ---------- */
.page-faq .kb-side__label {
  margin: 0 0 10px;
  padding-bottom: 10px;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--muted);
  border-bottom: 1px solid var(--line);
}

.page-faq .kb-index {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-faq .kb-index::-webkit-scrollbar {
  display: none;
}

.page-faq .kb-index__link {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 10px 13px;
  white-space: nowrap;
  font-size: 14px;
  color: var(--muted);
  text-decoration: none;
  border-left: 2px solid transparent;
  background: rgba(16, 38, 63, 0.4);
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.page-faq .kb-index__link:hover,
.page-faq .kb-index__link:focus-visible {
  color: var(--text);
  background: var(--cyan-soft);
  border-left-color: var(--teal);
}

.page-faq .kb-index__link[aria-current="true"],
.page-faq .kb-index__link.is-active {
  color: var(--cyan);
  background: var(--cyan-soft);
  border-left-color: var(--cyan);
}

.page-faq .kb-index__num {
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  color: var(--teal);
}

.page-faq .kb-index__link[aria-current="true"] .kb-index__num,
.page-faq .kb-index__link.is-active .kb-index__num {
  color: var(--cyan);
}

.page-faq .kb-side__cta {
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px dashed var(--line-soft);
}

.page-faq .kb-side__cta p {
  margin: 0 0 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 问答分组 ---------- */
.page-faq .kb-sec {
  scroll-margin-top: calc(var(--top-h) + 20px);
}

.page-faq .kb-sec + .kb-sec {
  margin-top: clamp(38px, 6.4vw, 68px);
  padding-top: clamp(26px, 4.6vw, 44px);
  border-top: 1px solid var(--line-soft);
}

.page-faq .kb-sec__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 14px;
  margin-bottom: 20px;
}

.page-faq .kb-sec__idx {
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--teal);
}

.page-faq .kb-sec__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-stretch: condensed;
  letter-spacing: -0.01em;
  font-size: clamp(22px, 4.4vw, 30px);
  line-height: 1.15;
  color: var(--text);
}

.page-faq .kb-sec__note {
  flex: 1 0 100%;
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.68;
  color: var(--muted);
}

/* ---------- 图片 ---------- */
.page-faq .kb-figure {
  margin: 0 0 22px;
}

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

.page-faq .kb-inline-figure {
  margin: 0;
}

.page-faq .kb-inline-figure img {
  display: block;
  width: 100%;
  max-width: 220px;
  height: auto;
  border: 1px solid var(--line-soft);
  object-fit: cover;
}

/* ---------- 折叠问答 ---------- */
.page-faq .kb-qa {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-faq .kb-q {
  border: 1px solid var(--line-soft);
  background: rgba(16, 38, 63, 0.46);
  transition: border-color 0.22s ease, background-color 0.22s ease, transform 0.22s ease;
}

.page-faq .kb-q:hover {
  border-color: var(--line);
  transform: translateY(-2px);
}

.page-faq .kb-q[open] {
  border-color: var(--line);
  background: rgba(16, 38, 63, 0.82);
  transform: none;
}

.page-faq .kb-q__head {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.58;
  color: var(--text);
}

.page-faq .kb-q__head::-webkit-details-marker {
  display: none;
}

.page-faq .kb-q__head::marker {
  content: "";
}

.page-faq .kb-q__head:hover {
  color: var(--cyan);
}

.page-faq .kb-q__icon {
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  margin-top: 7px;
  border-right: 2px solid var(--cyan);
  border-bottom: 2px solid var(--cyan);
  transform: rotate(-45deg);
  transition: transform 0.24s ease;
}

.page-faq .kb-q[open] .kb-q__icon {
  transform: rotate(45deg);
}

.page-faq .kb-q__body {
  margin: 0 18px 18px;
  padding: 2px 0 2px 16px;
  border-left: var(--kb-accent) solid var(--cyan);
}

.page-faq .kb-q__body p {
  max-width: 62ch;
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--text);
  opacity: 0.86;
}

.page-faq .kb-q__body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
}

.page-faq .kb-q__body a:hover {
  color: var(--red-lift);
  border-bottom-color: var(--red-lift);
}

.page-faq .kb-q__body--media {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 720px) {
  .page-faq .kb-quick__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-faq .kb-q__head {
    font-size: 17px;
    padding: 18px 22px;
  }

  .page-faq .kb-q__body {
    margin: 0 22px 20px;
    padding-left: 18px;
  }

  .page-faq .kb-q__body--media {
    grid-template-columns: minmax(0, 1fr) 200px;
    align-items: start;
  }
}

/* ---------- 桌面双栏 ---------- */
@media (min-width: 960px) {
  .page-faq .kb-hero::after {
    right: 24px;
    top: 6px;
    width: 104px;
    height: 104px;
  }

  .page-faq .kb-layout {
    grid-template-columns: var(--kb-side-w) minmax(0, 1fr);
    gap: var(--kb-gap);
    align-items: start;
  }

  .page-faq .kb-side {
    position: sticky;
    top: calc(var(--top-h) + 26px);
  }

  .page-faq .kb-index {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
  }

  .page-faq .kb-index__link {
    background: transparent;
    padding: 11px 12px;
  }

  .page-faq .kb-index__text {
    overflow: hidden;
    text-overflow: ellipsis;
  }
}

/* ---------- 窄屏收纳 ---------- */
@media (max-width: 959px) {
  .page-faq .kb-side__cta {
    display: none;
  }
}

@media (max-width: 719px) {
  .page-faq .kb-hero::after {
    display: none;
  }

  .page-faq .kb-quick__item {
    padding: 16px 16px 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .kb-q,
  .page-faq .kb-q__icon,
  .page-faq .kb-index__link {
    transition: none;
  }

  .page-faq .kb-q:hover {
    transform: none;
  }
}