.page-faq {
  --faq-rule: rgba(47, 227, 210, 0.22);
  --faq-surface: rgba(255, 255, 255, 0.035);
  --faq-surface-2: rgba(255, 255, 255, 0.065);
  --faq-text: #E3ECF2;
  --faq-text-dim: #A7BCCC;
  position: relative;
  display: block;
  padding-bottom: 88px;
  background-color: var(--night);
  color: var(--faq-text);
  font-family: var(--font-sans);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: calc(var(--header-h) + 48px) 0 34px;
  background-image:
    linear-gradient(rgba(47, 227, 210, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(47, 227, 210, 0.055) 1px, transparent 1px);
  background-size: 84px 84px, 84px 84px;
  border-bottom: 1px solid var(--faq-rule);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(180deg, rgba(7, 26, 46, 0.35), var(--night) 82%);
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  right: -10%;
  top: 16%;
  z-index: -1;
  width: min(560px, 62%);
  height: 340px;
  background: linear-gradient(140deg, rgba(47, 227, 210, 0.2), rgba(47, 227, 210, 0) 62%);
  clip-path: polygon(100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-faq .faq-h1 {
  margin: 14px 0 0;
  max-width: 22em;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(1.9rem, 6vw, 3.15rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: #F4F9FC;
}

.page-faq .faq-lede {
  margin: 18px 0 0;
  max-width: 44em;
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--faq-text-dim);
}

.page-faq .faq-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  margin-top: 26px;
  padding-top: 16px;
  border-top: 1px solid var(--faq-rule);
}

.page-faq .faq-meta-item {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
  color: var(--mist);
}

.page-faq .faq-meta-item b {
  margin-right: 2px;
  font-weight: 700;
  color: var(--cyan);
}

/* ---------- 主体栅格 ---------- */
.page-faq .faq-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 38px;
  padding-top: 44px;
}

/* ---------- 分组索引 ---------- */
.page-faq .faq-index {
  align-self: start;
}

.page-faq .faq-index-title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.2em;
  color: var(--mist);
}

.page-faq .faq-index-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-left: 1px solid var(--faq-rule);
}

.page-faq .faq-index-item {
  margin: 0;
}

.page-faq .faq-index-link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 10px 12px 10px 15px;
  color: var(--faq-text-dim);
  font-size: var(--fs-14);
  line-height: 1.45;
  text-decoration: none;
  transition: color 200ms var(--ease), background-color 200ms var(--ease);
}

.page-faq .faq-index-link::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 0;
  width: 1px;
  height: 0;
  background: var(--cyan);
  transition: height 200ms var(--ease);
}

.page-faq .faq-index-link:hover,
.page-faq .faq-index-link:focus-visible {
  color: var(--cyan);
  background: rgba(47, 227, 210, 0.06);
}

.page-faq .faq-index-link:hover::before,
.page-faq .faq-index-link:focus-visible::before,
.page-faq .faq-index-link[aria-current="true"]::before {
  height: 100%;
}

.page-faq .faq-index-link[aria-current="true"] {
  color: var(--cyan);
  background: rgba(47, 227, 210, 0.07);
}

.page-faq .faq-index-num {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.04em;
  color: var(--mist);
}

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

.page-faq .faq-index-foot {
  margin: 16px 0 0;
  font-size: var(--fs-12);
  line-height: 1.8;
  color: var(--mist);
}

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

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

.page-faq .faq-group {
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-faq .faq-group + .faq-group {
  margin-top: 60px;
}

.page-faq .faq-group-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: start;
  gap: 0 16px;
  padding-top: 16px;
  border-top: 1px solid var(--faq-rule);
}

.page-faq .faq-num {
  font-family: var(--font-mono);
  font-size: var(--fs-20);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
  color: var(--cyan);
  line-height: 1.3;
}

.page-faq .faq-group-title {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: var(--fs-20);
  letter-spacing: -0.02em;
  line-height: 1.3;
  color: #F4F9FC;
}

.page-faq .faq-group-note {
  margin: 6px 0 0;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--faq-text-dim);
}

/* ---------- 折叠问答 ---------- */
.page-faq .qa {
  margin-top: 10px;
  border-left: 1px solid var(--cyan);
  background: var(--faq-surface);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.page-faq .qa[open] {
  background: var(--faq-surface-2);
}

.page-faq .qa-q {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 15px 16px;
  list-style: none;
  cursor: pointer;
  font-size: var(--fs-16);
  font-weight: 500;
  line-height: 1.6;
  color: #EAF2F7;
  transition: color 200ms var(--ease);
}

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

.page-faq .qa-q::before {
  content: "";
  flex: none;
  width: 8px;
  height: 8px;
  margin-top: 0.55em;
  border-right: 1px solid var(--cyan);
  border-bottom: 1px solid var(--cyan);
  transform: rotate(-45deg);
  transition: transform 200ms var(--ease), border-color 200ms var(--ease);
}

.page-faq .qa[open] .qa-q::before {
  border-color: var(--orange);
  transform: rotate(45deg);
}

.page-faq .qa-q:hover,
.page-faq .qa-q:focus-visible {
  color: var(--cyan);
}

.page-faq .qa-a {
  padding: 0 16px 18px 38px;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--faq-text-dim);
}

.page-faq .qa-a p {
  margin: 0 0 0.85em;
  max-width: 40em;
}

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

.page-faq .qa-a ul {
  margin: 0.4em 0 0.9em;
  padding: 0;
  list-style: none;
  max-width: 40em;
}

.page-faq .qa-a li {
  position: relative;
  margin-bottom: 0.4em;
  padding-left: 16px;
}

.page-faq .qa-a li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.82em;
  width: 8px;
  height: 1px;
  background: var(--cyan-dim);
}

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

.page-faq .qa-a .mono {
  color: #D9E7EE;
  font-variant-numeric: tabular-nums;
}

/* ---------- 配图 ---------- */
.page-faq .faq-figure {
  margin: 20px 0 0;
  padding: 0;
  border: 1px solid rgba(47, 227, 210, 0.2);
  background: var(--ink);
  overflow: hidden;
}

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

.page-faq .faq-figure .media-caption,
.page-faq .terms-figure .media-caption {
  display: block;
  padding: 10px 14px 12px;
}

/* ---------- 术语表 ---------- */
.page-faq .terms-panel {
  margin-top: 20px;
  padding: 26px 20px 20px;
  background: var(--paper);
  color: var(--paper-ink);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), 0 100%);
}

.page-faq .terms-intro {
  margin: 0 0 16px;
  max-width: 58ch;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: #38424E;
}

.page-faq .term-list {
  margin: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}

.page-faq .term-row {
  display: grid;
  grid-template-columns: minmax(84px, 112px) minmax(0, 1fr);
  gap: 4px 14px;
  padding: 12px 0;
  border-bottom: 1px solid rgba(16, 24, 32, 0.14);
}

.page-faq .term-key {
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  font-weight: 700;
  line-height: 1.6;
  letter-spacing: -0.01em;
  color: var(--orange-deep);
}

.page-faq .term-def {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: #2B3644;
}

.page-faq .terms-figure {
  margin: 22px 0 0;
  background: rgba(16, 24, 32, 0.06);
  overflow: hidden;
}

.page-faq .terms-figure .media-caption {
  color: #4A5563;
}

/* ---------- 联系引导带 ---------- */
.page-faq .faq-contact-band {
  margin-top: 18px;
  padding: 20px 18px 22px;
  border: 1px solid rgba(47, 227, 210, 0.3);
  background: linear-gradient(135deg, rgba(47, 227, 210, 0.1), rgba(47, 227, 210, 0) 72%);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), 0 100%);
}

.page-faq .faq-contact-band p {
  margin: 0 0 16px;
  max-width: 38em;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--faq-text-dim);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-faq .faq-body {
    gap: 46px;
    padding-top: 52px;
  }

  .page-faq .qa-q {
    padding: 17px 22px;
  }

  .page-faq .qa-a {
    padding: 0 22px 20px 44px;
  }

  .page-faq .terms-panel {
    padding: 32px 30px 26px;
  }

  .page-faq .term-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 40px;
  }

  .page-faq .terms-figure {
    margin-top: 26px;
  }

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

@media (min-width: 960px) {
  .page-faq .faq-body {
    grid-template-columns: 250px minmax(0, 1fr);
    gap: 64px;
    padding-top: 60px;
  }

  .page-faq .faq-index {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }

  .page-faq .faq-hero {
    padding: calc(var(--header-h) + 64px) 0 46px;
  }

  .page-faq .faq-group + .faq-group {
    margin-top: 72px;
  }

  .page-faq .faq-figure {
    margin-top: 26px;
  }

  .page-faq .faq-figure img {
    max-height: 420px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-index-link,
  .page-faq .faq-index-link::before,
  .page-faq .qa-q,
  .page-faq .qa-q::before {
    transition-duration: 1ms;
  }
}