.page-faq {
  --faq-hair: 1px solid var(--line);
  --faq-gap: clamp(22px, 3.4vw, 44px);
  position: relative;
  padding-block: clamp(20px, 3.5vw, 48px) clamp(56px, 9vw, 120px);
}

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

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  display: grid;
  gap: clamp(24px, 4vw, 52px);
  padding: clamp(18px, 3vw, 40px) 0 clamp(30px, 5vw, 68px);
  overflow: hidden;
  border-bottom: var(--faq-hair);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  top: -34%;
  right: -14%;
  width: min(560px, 78%);
  aspect-ratio: 1 / 1;
  background:
    linear-gradient(142deg, rgba(43, 245, 208, .14), rgba(43, 245, 208, 0) 58%),
    linear-gradient(318deg, rgba(255, 106, 26, .13), rgba(255, 106, 26, 0) 62%);
  transform: rotate(-10deg);
  pointer-events: none;
}

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

.page-faq .faq-hero-text {
  display: grid;
  gap: clamp(14px, 1.8vw, 20px);
  align-content: start;
  min-width: 0;
}

.page-faq .faq-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-2);
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-faq .faq-eyebrow::before {
  content: "";
  width: 32px;
  height: 2px;
  background: linear-gradient(90deg, var(--orange), var(--cyan));
}

.page-faq h1 {
  margin: 0;
  max-width: 16ch;
  font-family: var(--font-display);
  font-size: clamp(34px, 6.4vw, 76px);
  line-height: .98;
  letter-spacing: -.02em;
  color: var(--white);
}

.page-faq .faq-lede {
  margin: 0;
  max-width: 54ch;
  font-size: var(--fs-3);
  line-height: 1.85;
  color: rgba(242, 245, 247, .82);
}

.page-faq .faq-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 4px 0 0;
}

.page-faq .faq-hero-figure {
  margin: 0;
  aspect-ratio: 5 / 4;
  border: var(--faq-hair);
}

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

/* ---------- 主体两栏 ---------- */
.page-faq .faq-shell {
  display: grid;
  gap: var(--faq-gap);
  padding-top: clamp(28px, 4.5vw, 64px);
  min-width: 0;
}

.page-faq .faq-main {
  display: grid;
  gap: clamp(38px, 5vw, 72px);
  min-width: 0;
}

.page-faq .faq-side {
  min-width: 0;
}

/* ---------- 快速索引 ---------- */
.page-faq .faq-index {
  border-top: 2px solid var(--orange);
  padding-top: 14px;
}

.page-faq .faq-index-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--muted);
}

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

.page-faq .faq-index-list li {
  flex: 0 0 auto;
}

.page-faq .faq-index-list a {
  display: grid;
  grid-template-columns: auto auto;
  gap: 8px;
  align-items: center;
  padding: 8px 12px;
  border: 1px solid var(--line);
  color: var(--muted);
  font-size: var(--fs-2);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-faq .faq-index-num {
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-faq .faq-index-list a:hover {
  color: var(--white);
  border-color: var(--cyan);
  background: var(--glass);
}

/* ---------- 分组 ---------- */
.page-faq .faq-group {
  position: relative;
  padding-left: clamp(12px, 1.8vw, 22px);
  border-left: 2px solid rgba(255, 106, 26, .35);
  scroll-margin-top: calc(var(--bar-h) + 24px);
  transition: border-color var(--dur) var(--ease);
}

.page-faq .faq-group:target {
  border-left-color: var(--orange);
}

.page-faq .faq-list {
  margin-top: clamp(10px, 1.6vw, 18px);
  border-top: var(--faq-hair);
}

.page-faq .faq-more {
  margin: 18px 0 0;
}

/* ---------- 折叠问答 ---------- */
.page-faq .faq-item {
  border-bottom: var(--faq-hair);
  border-left: 2px solid transparent;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

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

.page-faq .faq-item summary {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 14px;
  align-items: start;
  padding: 15px 4px 15px 14px;
  cursor: pointer;
  list-style: none;
  color: var(--white);
  font-size: var(--fs-3);
  font-weight: 500;
  line-height: 1.62;
  overflow-wrap: anywhere;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

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

.page-faq .faq-item summary::marker {
  content: "";
}

.page-faq .faq-item summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1.35;
  color: var(--cyan);
  transition: color var(--dur) var(--ease);
}

.page-faq .faq-item[open] summary::after {
  content: "\2212";
  color: var(--orange);
}

.page-faq .faq-item summary:hover {
  background: rgba(242, 245, 247, .035);
}

.page-faq .faq-answer {
  max-width: 68ch;
  padding: 0 8px 18px 14px;
  color: rgba(242, 245, 247, .8);
  font-size: var(--fs-3);
  line-height: 1.82;
}

.page-faq .faq-answer p {
  margin: 0;
}

.page-faq .faq-num {
  font-family: var(--font-mono);
  font-size: .82em;
  color: var(--cyan);
  letter-spacing: .02em;
  font-variant-numeric: tabular-nums;
}

@keyframes faq-reveal {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.page-faq .faq-item[open] .faq-answer {
  animation: faq-reveal 180ms var(--ease) both;
}

/* ---------- 下载配图 ---------- */
.page-faq .faq-download-figure {
  margin: clamp(18px, 2.6vw, 28px) 0 0;
  border: var(--faq-hair);
}

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

/* ---------- 联系卡片 ---------- */
.page-faq .faq-contact {
  display: grid;
  gap: 18px;
  margin-top: clamp(14px, 2vw, 22px);
  padding: clamp(20px, 3vw, 34px);
}

.page-faq .faq-contact p {
  margin: 0;
  max-width: 62ch;
  font-size: var(--fs-3);
  line-height: 1.82;
  color: rgba(242, 245, 247, .82);
}

.page-faq .faq-contact-list {
  display: grid;
  gap: 14px;
  margin: 0;
}

.page-faq .faq-contact-list > div {
  display: grid;
  gap: 4px;
}

.page-faq .faq-contact-list dt {
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  letter-spacing: .12em;
  color: var(--muted);
}

.page-faq .faq-contact-list dd {
  margin: 0;
  font-size: var(--fs-3);
  color: var(--white);
  overflow-wrap: anywhere;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-faq .faq-contact-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .85fr);
    align-items: center;
  }

  .page-faq .faq-hero-figure {
    aspect-ratio: 4 / 3;
  }
}

@media (min-width: 1040px) {
  .page-faq .faq-shell {
    grid-template-columns: minmax(0, 1fr) 236px;
    align-items: start;
  }

  .page-faq .faq-main {
    grid-column: 1;
    grid-row: 1;
  }

  .page-faq .faq-side {
    grid-column: 2;
    grid-row: 1;
    position: sticky;
    top: calc(var(--bar-h) + 24px);
  }

  .page-faq .faq-index-list {
    display: grid;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-index-list a {
    grid-template-columns: 34px minmax(0, 1fr);
    border: 0;
    border-left: 2px solid transparent;
    padding: 9px 10px;
    white-space: normal;
  }

  .page-faq .faq-index-list a:hover {
    background: var(--glass);
    border-left-color: var(--cyan);
    border-top-color: transparent;
    border-right-color: transparent;
    border-bottom-color: transparent;
  }
}

@media (max-width: 559px) {
  .page-faq .faq-group {
    padding-left: 12px;
  }

  .page-faq .faq-item summary {
    padding: 14px 0 14px 10px;
    font-size: 16px;
  }

  .page-faq .faq-answer {
    padding: 0 0 16px 10px;
    font-size: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item[open] .faq-answer {
    animation: none;
  }

  .page-faq .faq-item,
  .page-faq .faq-item summary,
  .page-faq .faq-index-list a,
  .page-faq .faq-group {
    transition: none;
  }
}