.page-faq {
  background: var(--c-paper);
  color: var(--c-text);
  font-family: var(--font-body);
  overflow-x: hidden;
}

/* ---------- 首屏封面 ---------- */
.page-faq .kb-hero {
  position: relative;
  overflow: hidden;
  background: var(--c-indigo);
  color: var(--c-text-dark);
  padding: clamp(22px, 4vw, 38px) 0 clamp(34px, 6vw, 68px);
  border-bottom: 1px solid rgba(0, 229, 199, 0.34);
}

.page-faq .kb-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(233, 238, 247, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(233, 238, 247, 0.055) 1px, transparent 1px);
  background-size: 64px 64px;
  pointer-events: none;
}

.page-faq .kb-hero::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: clamp(110px, 22vw, 300px);
  height: 5px;
  background: var(--c-orange);
}

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

.page-faq .kb-hero .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-faq .kb-hero .breadcrumb-item {
  color: rgba(233, 238, 247, 0.62);
}

.page-faq .kb-hero a.breadcrumb-item {
  color: rgba(233, 238, 247, 0.85);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-faq .kb-hero a.breadcrumb-item:hover {
  color: var(--c-cyan);
  border-bottom-color: var(--c-cyan);
}

.page-faq .kb-hero .breadcrumb-sep {
  color: rgba(233, 238, 247, 0.32);
}

.page-faq .kb-kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--c-cyan);
  margin: 0 0 16px;
}

.page-faq .kb-title {
  font-family: var(--font-heading);
  font-size: clamp(32px, 6.2vw, 70px);
  font-weight: 700;
  line-height: 1.07;
  letter-spacing: 0.01em;
  margin: 0 0 20px;
  max-width: 17em;
  color: #FFFFFF;
}

.page-faq .kb-lead {
  max-width: var(--w-narrow);
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: rgba(233, 238, 247, 0.8);
  margin: 0 0 26px;
}

.page-faq .kb-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-faq .kb-tags li {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  padding: 6px 11px;
  border: 1px solid rgba(233, 238, 247, 0.22);
  color: rgba(233, 238, 247, 0.88);
}

.page-faq .kb-tags li strong {
  color: var(--c-orange);
  font-weight: 600;
}

/* ---------- 主体骨架 ---------- */
.page-faq .kb-shell {
  padding-top: clamp(28px, 5vw, 56px);
  padding-bottom: clamp(32px, 5vw, 64px);
}

/* ---------- 分组目录 ---------- */
.page-faq .kb-toc {
  margin-bottom: 30px;
}

.page-faq .kb-toc-title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-indigo-soft);
  margin: 0 0 10px;
}

.page-faq .kb-toc-list {
  display: flex;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-faq .kb-toc-link {
  display: block;
  white-space: nowrap;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.02em;
  padding: 8px 12px;
  border: 1px solid var(--c-grid);
  background: #FFFFFF;
  color: var(--c-indigo);
  text-decoration: none;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease), background-color 0.18s var(--ease);
}

.page-faq .kb-toc-link:hover {
  border-color: var(--c-indigo-soft);
}

.page-faq .kb-toc-link[aria-current] {
  border-color: var(--c-orange);
  background: #FFF3ED;
  color: var(--c-orange-text);
}

/* ---------- 问答分组 ---------- */
.page-faq .kb-group {
  scroll-margin-top: calc(var(--header-h) + 24px);
  padding-bottom: clamp(30px, 5vw, 54px);
  margin-bottom: clamp(30px, 5vw, 54px);
  border-bottom: 1px solid var(--c-grid);
}

.page-faq .kb-group:last-child {
  border-bottom: 0;
  margin-bottom: 0;
  padding-bottom: 0;
}

.page-faq .kb-group-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0 14px;
  margin-bottom: 22px;
}

.page-faq .kb-group-idx {
  align-self: start;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1;
  padding: 7px 9px;
  color: var(--c-orange-text);
  border: 1px solid rgba(255, 107, 53, 0.5);
}

.page-faq .kb-group-head h2 {
  font-family: var(--font-heading);
  font-size: clamp(21px, 2.7vw, 31px);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: 0.01em;
  margin: 0 0 10px;
  color: var(--c-indigo);
}

.page-faq .kb-group-note {
  grid-column: 2;
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: #4A5468;
  max-width: 62ch;
}

/* ---------- 插图 ---------- */
.page-faq .kb-figure {
  margin: 0 0 24px;
  padding: 6px;
  background: #FFFFFF;
  border: 1px solid var(--c-grid);
}

.page-faq .kb-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

.page-faq .kb-figure figcaption {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--c-indigo-soft);
  padding: 9px 4px 3px;
}

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

.page-faq .qa-item {
  background: #FFFFFF;
  border: 1px solid var(--c-grid);
  border-left: 3px solid var(--c-indigo-soft);
  border-radius: var(--radius);
  transition: border-color 0.18s var(--ease), box-shadow 0.18s var(--ease);
}

.page-faq .qa-item:hover {
  box-shadow: 0 1px 0 rgba(27, 42, 74, 0.06);
}

.page-faq .qa-item[open] {
  border-left-color: var(--c-orange);
}

.page-faq .qa-q {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-heading);
  font-size: clamp(16px, 1.6vw, 18px);
  font-weight: 600;
  line-height: 1.55;
  color: var(--c-text);
}

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

.page-faq .qa-q::before {
  content: "";
  flex: none;
  width: 8px;
  height: 8px;
  margin-top: 9px;
  border-radius: 50%;
  background: var(--c-indigo-soft);
  transition: background-color 0.18s var(--ease);
}

.page-faq .qa-item[open] .qa-q::before {
  background: var(--c-orange);
}

.page-faq .qa-q::after {
  content: "+";
  flex: none;
  margin-left: auto;
  padding-left: 10px;
  font-family: var(--font-mono);
  font-size: 17px;
  line-height: 1.4;
  color: var(--c-indigo-soft);
}

.page-faq .qa-item[open] .qa-q::after {
  content: "–";
  color: var(--c-orange);
}

.page-faq .qa-a {
  padding: 0 18px 18px 38px;
  max-width: 68ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: #3B4559;
}

.page-faq .qa-a p {
  margin: 0;
}

.page-faq .kb-link {
  color: var(--c-orange-text);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.page-faq .kb-link:hover {
  color: var(--c-indigo);
}

/* ---------- 术语速查 ---------- */
.page-faq .kb-terms {
  background: var(--c-ink);
  color: var(--c-text-dark);
  padding: clamp(36px, 6vw, 72px) 0;
  border-top: 1px solid rgba(0, 229, 199, 0.34);
}

.page-faq .terms-top {
  display: grid;
  gap: 26px;
  margin-bottom: 32px;
}

.page-faq .terms-kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-cyan);
  margin: 0 0 14px;
}

.page-faq .terms-top h2 {
  font-family: var(--font-heading);
  font-size: clamp(21px, 2.7vw, 30px);
  font-weight: 700;
  line-height: 1.32;
  margin: 0 0 14px;
  color: #FFFFFF;
  max-width: 24em;
}

.page-faq .terms-note {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(233, 238, 247, 0.74);
}

.page-faq .terms-figure {
  margin: 0;
  padding: 6px;
  border: 1px solid rgba(233, 238, 247, 0.16);
}

.page-faq .terms-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.page-faq .term-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: rgba(233, 238, 247, 0.14);
  border: 1px solid rgba(233, 238, 247, 0.14);
}

.page-faq .term-cell {
  background: var(--c-ink);
  padding: 18px 20px;
}

.page-faq .term-name {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 9px;
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.02em;
  color: #FFFFFF;
}

.page-faq .term-unit {
  font-size: 12px;
  color: var(--c-cyan);
  letter-spacing: 0.05em;
}

.page-faq .term-desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: rgba(233, 238, 247, 0.72);
}

/* ---------- 结尾推进 ---------- */
.page-faq .kb-cta {
  background: #FFFFFF;
  border-top: 1px solid var(--c-grid);
  padding: clamp(32px, 5vw, 58px) 0;
}

.page-faq .cta-inner {
  display: grid;
  gap: 20px;
  align-items: center;
}

.page-faq .cta-title {
  font-family: var(--font-heading);
  font-size: clamp(20px, 2.6vw, 29px);
  font-weight: 700;
  line-height: 1.35;
  color: var(--c-indigo);
  margin: 0 0 10px;
}

.page-faq .cta-text {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.8;
  color: #4A5468;
}

.page-faq .kb-cta .btn {
  justify-self: start;
}

/* ---------- 桌面端网格 ---------- */
@media (min-width: 640px) {
  .page-faq .term-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-faq .terms-top {
    grid-template-columns: minmax(0, 1fr) 280px;
    align-items: end;
    gap: 52px;
  }

  .page-faq .cta-inner {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 44px;
  }
}

@media (min-width: 980px) {
  .page-faq .kb-shell {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 206px;
    grid-template-areas: "body toc";
    gap: 0 56px;
    align-items: start;
  }

  .page-faq .kb-body {
    grid-area: body;
    min-width: 0;
  }

  .page-faq .kb-toc {
    grid-area: toc;
    position: sticky;
    top: calc(var(--header-h) + 24px);
    margin-bottom: 0;
  }

  .page-faq .kb-toc-list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding: 0;
  }

  .page-faq .kb-toc-link {
    white-space: normal;
    padding: 9px 12px;
    border: 0;
    border-left: 2px solid var(--c-grid);
    background: transparent;
  }

  .page-faq .kb-toc-link[aria-current] {
    border-left-color: var(--c-orange);
    background: rgba(255, 107, 53, 0.07);
  }

  .page-faq .kb-toc-link:hover {
    border-left-color: var(--c-indigo-soft);
  }
}

@media (min-width: 1040px) {
  .page-faq .term-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa-item,
  .page-faq .qa-q::before,
  .page-faq .qa-q::after,
  .page-faq .kb-toc-link {
    transition: none;
  }
}