.page-faq {
  --faq-side: 252px;
  padding-bottom: 80px;
}

.page-faq .breadcrumb {
  padding-top: 18px;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  padding-top: 26px;
}

.page-faq .faq-hero .eyebrow {
  color: var(--signal);
  letter-spacing: 0.18em;
}

.page-faq .faq-hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(38px, 6.6vw, 78px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--paper);
  max-width: 15ch;
  margin: 14px 0 20px;
}

.page-faq .faq-hero .lede {
  max-width: 62ch;
  margin: 0;
  color: var(--mute);
  font-size: 16px;
  line-height: 1.8;
}

.page-faq .faq-hero__media {
  position: relative;
  margin: 40px 0 0;
  overflow: hidden;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(5, 7, 13, 0.2) 35%, rgba(5, 7, 13, 0.9) 100%);
  pointer-events: none;
}

.page-faq .faq-hero__media img {
  display: block;
  width: 100%;
  height: clamp(180px, 28vw, 360px);
  object-fit: cover;
  filter: saturate(0.75) brightness(0.72);
}

/* ---------- 三条主路径速查 ---------- */
.page-faq .faq-quick {
  padding: 60px 0 0;
}

.page-faq .faq-quick h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.2vw, 36px);
  letter-spacing: -0.01em;
  color: var(--paper);
  margin: 0 0 10px;
}

.page-faq .faq-quick__sub {
  max-width: 60ch;
  margin: 0 0 26px;
  color: var(--mute);
  font-size: 15px;
  line-height: 1.75;
}

.page-faq .faq-quick__list {
  border-top: 1px solid var(--line);
}

.page-faq .faq-quick__row {
  position: relative;
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 6px 16px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-quick__row::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--signal);
  transform: scaleY(0);
  transform-origin: top center;
  transition: transform 0.28s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.page-faq .faq-quick__row:hover::before,
.page-faq .faq-quick__row:focus-within::before {
  transform: scaleY(1);
}

.page-faq .faq-quick__no {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--signal);
  padding-top: 4px;
}

.page-faq .faq-quick__main {
  grid-column: 2;
  min-width: 0;
}

.page-faq .faq-quick__title {
  font-size: 19px;
  font-weight: 700;
  color: var(--paper);
  margin: 0 0 6px;
}

.page-faq .faq-quick__desc {
  margin: 0;
  color: var(--mute);
  font-size: 15px;
  line-height: 1.75;
}

.page-faq .faq-quick__dev {
  grid-column: 2;
  justify-self: start;
  margin-top: 10px;
}

/* ---------- 两栏布局 ---------- */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 40px;
  padding-top: 56px;
}

.page-faq .faq-index {
  padding: 18px 16px 20px;
  border: 1px solid var(--line);
  background: linear-gradient(160deg, rgba(11, 18, 32, 0.94), rgba(5, 7, 13, 0.94));
}

.page-faq .faq-index__head {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-faq .faq-index ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-faq .faq-index__link {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  padding: 10px 8px 10px 10px;
  border-left: 2px solid transparent;
  color: var(--mute);
  font-size: 14px;
  line-height: 1.4;
  text-decoration: none;
  transition: color 0.18s ease, border-color 0.18s ease, background-color 0.18s ease;
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  color: var(--paper);
  border-left-color: var(--signal);
  background: rgba(200, 255, 61, 0.07);
}

.page-faq .faq-index__no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--line);
}

.page-faq .faq-index__link:hover .faq-index__no,
.page-faq .faq-index__link:focus-visible .faq-index__no {
  color: var(--signal);
}

.page-faq .faq-index__note {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  color: var(--mute);
  font-size: 12.5px;
  line-height: 1.7;
}

/* ---------- 分组 ---------- */
.page-faq .faq-group {
  position: relative;
  padding: 46px 0 4px;
  scroll-margin-top: calc(var(--header-h) + 26px);
}

.page-faq .faq-group:first-child {
  padding-top: 0;
}

.page-faq .faq-group + .faq-group::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 10%;
  height: 1px;
  background: linear-gradient(90deg, var(--line) 0%, rgba(42, 58, 85, 0.12) 100%);
  transform: rotate(-1.1deg);
  transform-origin: left center;
  pointer-events: none;
}

.page-faq .faq-group__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 14px;
  align-items: baseline;
  margin-bottom: 20px;
}

.page-faq .faq-group__no {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--signal);
}

.page-faq .faq-group__head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 3.6vw, 42px);
  letter-spacing: -0.01em;
  color: var(--paper);
  transition: color 0.2s ease;
}

.page-faq .faq-group:target .faq-group__head h2 {
  color: var(--signal);
}

.page-faq .faq-group__hint {
  grid-column: 1 / -1;
  margin: 6px 0 0;
  max-width: 58ch;
  color: var(--mute);
  font-size: 14px;
  line-height: 1.75;
}

/* ---------- 手风琴 ---------- */
.page-faq .faq-list {
  display: grid;
  gap: 10px;
}

.page-faq .faq-item {
  border: 1px solid var(--line);
  border-left: 2px solid var(--line);
  background: rgba(11, 18, 32, 0.45);
  transition: border-color 0.22s ease, background-color 0.22s ease;
}

.page-faq .faq-item[open] {
  border-left-color: var(--signal);
  background: rgba(11, 18, 32, 0.88);
}

.page-faq .faq-item summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
  color: var(--paper);
  font-size: 15.5px;
  font-weight: 500;
  line-height: 1.5;
  transition: color 0.18s ease;
}

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

.page-faq .faq-item summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 17px;
  line-height: 1;
  color: var(--signal);
}

.page-faq .faq-item[open] summary::after {
  content: "\2212";
}

.page-faq .faq-item summary:hover {
  color: var(--signal);
}

.page-faq .faq-item__q {
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--mute);
}

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

.page-faq .faq-item__body {
  padding: 14px 16px 20px;
  border-top: 1px solid rgba(42, 58, 85, 0.6);
  color: var(--mute);
  font-size: 15px;
  line-height: 1.8;
}

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

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

/* 回看示意配图 */
.page-faq .faq-figure {
  margin: 22px 0 0;
  border: 1px solid var(--line);
  background: var(--ink-800);
  overflow: hidden;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(0.8) brightness(0.74);
}

.page-faq .faq-figure figcaption {
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  color: var(--mute);
  font-size: 13px;
  line-height: 1.7;
}

/* ---------- 深链接卡片 ---------- */
.page-faq .faq-deep {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  margin-top: 20px;
  padding: 15px 18px;
  border: 1px solid var(--line);
  background: rgba(20, 28, 44, 0.72);
  color: var(--paper);
  font-size: 14.5px;
  line-height: 1.6;
  text-decoration: none;
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 14px 100%, 0 calc(100% - 14px));
  transition: background-color 0.22s ease, border-color 0.22s ease;
}

.page-faq .faq-deep:hover,
.page-faq .faq-deep:focus-visible {
  background: rgba(20, 28, 44, 1);
  border-color: var(--signal);
}

.page-faq .faq-deep__tag {
  font-size: 10.5px;
  letter-spacing: 0.12em;
  color: var(--signal);
  border: 1px solid rgba(200, 255, 61, 0.42);
  padding: 3px 7px;
  white-space: nowrap;
}

.page-faq .faq-deep__text {
  flex: 1 1 220px;
  min-width: 0;
}

.page-faq .faq-deep__arrow {
  font-family: var(--font-mono);
  color: var(--flare);
}

.page-faq .faq-deep:focus-visible,
.page-faq .faq-index__link:focus-visible,
.page-faq .faq-item summary:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 2px;
}

/* ---------- 窄屏 ---------- */
@media (min-width: 640px) {
  .page-faq .faq-item summary {
    padding: 17px 22px;
    font-size: 16.5px;
  }

  .page-faq .faq-item__body {
    padding: 16px 22px 22px;
  }

  .page-faq .faq-deep {
    padding: 16px 22px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-quick__row {
    grid-template-columns: 64px minmax(0, 1fr) 210px;
    align-items: center;
    gap: 6px 24px;
  }

  .page-faq .faq-quick__no {
    padding-top: 0;
  }

  .page-faq .faq-quick__main {
    grid-column: 2;
  }

  .page-faq .faq-quick__dev {
    grid-column: 3;
    justify-self: end;
    margin-top: 0;
    text-align: right;
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-side) minmax(0, 1fr);
    gap: 60px;
  }

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

  .page-faq .faq-group {
    padding-top: 54px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-quick__row::before {
    transition: none;
  }

  .page-faq .faq-deep,
  .page-faq .faq-item {
    transition: none;
  }
}