.page-faq {
  --faq-pad: clamp(1rem, 3vw, 1.6rem);
  background: var(--c-deep);
  color: var(--c-text);
}

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

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding-block: clamp(1.25rem, 3.5vw, 2rem) clamp(1.75rem, 4.5vw, 3rem);
  border-bottom: 1px solid var(--c-line);
  overflow: hidden;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(36, 69, 92, 0.45) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(36, 69, 92, 0.22) 1px, transparent 1px);
  background-size: 96px 96px, 96px 96px;
  opacity: 0.6;
  pointer-events: none;
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
}

.page-faq .breadcrumb {
  margin-bottom: clamp(1rem, 3vw, 1.75rem);
}

.page-faq .breadcrumb__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--c-text-mute);
}

.page-faq .breadcrumb__item a {
  color: var(--c-text-dim);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-faq .breadcrumb__item a:hover {
  color: var(--c-cyan);
  border-bottom-color: var(--c-cyan);
}

.page-faq .breadcrumb__sep {
  color: var(--c-line);
}

.page-faq .faq-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  align-items: end;
  gap: clamp(1.5rem, 4vw, 3rem);
}

.page-faq .tick-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--c-orange);
  margin: 0 0 0.75rem;
}

.page-faq .faq-hero__copy h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.6rem, 5.2vw, 3.1rem);
  line-height: 1.12;
  letter-spacing: -0.01em;
  margin: 0 0 1rem;
  color: var(--c-text);
}

.page-faq .faq-hero__copy h1::after {
  content: "";
  display: block;
  width: clamp(3rem, 12vw, 7rem);
  height: 3px;
  margin-top: 1rem;
  background: var(--c-cyan);
}

.page-faq .lede {
  max-width: 58ch;
  margin: 0;
  font-size: clamp(0.95rem, 2.4vw, 1.0625rem);
  line-height: 1.8;
  color: var(--c-text-dim);
}

.page-faq .lede a {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(63, 227, 210, 0.45);
}

.page-faq .lede a:hover {
  border-bottom-color: var(--c-cyan);
}

.page-faq .faq-hero__media {
  margin: 0;
  border: 1px solid var(--c-line);
  background: var(--c-mid);
  box-shadow: 8px 8px 0 rgba(5, 21, 32, 0.6);
}

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

/* ---------- 问题索引 ---------- */
.page-faq .faq-index {
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
  padding-top: 0.875rem;
  border-top: 1px solid var(--c-line);
}

.page-faq .faq-index__label {
  margin: 0 0 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  color: var(--c-text-mute);
}

.page-faq .faq-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 0.6rem;
}

.page-faq .faq-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
  padding: 0.4rem 0.7rem;
  border: 1px solid var(--c-line);
  color: var(--c-text-dim);
  font-size: 0.8125rem;
  text-decoration: none;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease),
    transform var(--t-fast) var(--ease);
}

.page-faq .faq-index__link:hover {
  color: var(--c-cyan);
  border-color: var(--c-cyan);
  transform: translateY(-2px);
}

.page-faq .faq-index__num {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--c-orange);
}

/* ---------- 分组 ---------- */
.page-faq .faq-body {
  padding-bottom: clamp(2rem, 5vw, 3.5rem);
}

.page-faq .faq-group {
  padding-block: clamp(1.75rem, 4.5vw, 3rem);
  border-bottom: 1px solid var(--c-line);
  scroll-margin-top: 88px;
}

.page-faq .faq-group:last-of-type {
  border-bottom: 0;
}

.page-faq .faq-group__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  column-gap: clamp(0.75rem, 2vw, 1.25rem);
  row-gap: 0.5rem;
  margin-bottom: clamp(1rem, 2.5vw, 1.5rem);
}

.page-faq .faq-group__num {
  font-family: var(--font-mono);
  font-size: clamp(1.25rem, 3.6vw, 2rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-cyan);
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.125rem, 3vw, 1.625rem);
  letter-spacing: 0.01em;
  color: var(--c-text);
}

.page-faq .faq-group__desc {
  grid-column: 2;
  margin: 0;
  max-width: 64ch;
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--c-text-mute);
}

/* ---------- 折叠问答 ---------- */
.page-faq .faq-acc {
  border-top: 1px solid var(--c-line);
}

.page-faq .faq-item {
  border-bottom: 1px solid var(--c-line);
}

.page-faq .faq-item:last-child {
  border-bottom: 0;
}

.page-faq .faq-q {
  width: 100%;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: start;
  gap: 0.5rem 0.75rem;
  padding: clamp(0.8rem, 2vw, 1.05rem) 0.25rem;
  background: none;
  border: 0;
  color: var(--c-text);
  font-family: var(--font-body);
  font-size: clamp(0.9375rem, 2.3vw, 1.0625rem);
  font-weight: 500;
  line-height: 1.6;
  text-align: left;
  cursor: pointer;
  transition: color var(--t-fast) var(--ease), background-color var(--t-fast) var(--ease);
}

.page-faq .faq-q:hover {
  color: var(--c-cyan);
  background: rgba(18, 58, 82, 0.55);
}

.page-faq .faq-q__num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.9;
  color: var(--c-text-mute);
  transition: color var(--t-fast) var(--ease);
}

.page-faq .faq-q[aria-expanded="true"] .faq-q__num {
  color: var(--c-orange);
}

.page-faq .faq-q__icon {
  position: relative;
  width: 16px;
  height: 16px;
  margin-top: 0.32em;
  border: 1px solid var(--c-line);
  transition: border-color var(--t-fast) var(--ease), background-color var(--t-fast) var(--ease);
}

.page-faq .faq-q__icon::before,
.page-faq .faq-q__icon::after {
  content: "";
  position: absolute;
  background: var(--c-text-dim);
  transition: transform var(--t-base) var(--ease), opacity var(--t-fast) var(--ease),
    background-color var(--t-fast) var(--ease);
}

.page-faq .faq-q__icon::before {
  left: 3px;
  right: 3px;
  top: 50%;
  height: 1px;
  transform: translateY(-50%);
}

.page-faq .faq-q__icon::after {
  top: 3px;
  bottom: 3px;
  left: 50%;
  width: 1px;
  transform: translateX(-50%);
}

.page-faq .faq-q:hover .faq-q__icon {
  border-color: var(--c-cyan);
}

.page-faq .faq-q[aria-expanded="true"] .faq-q__icon {
  border-color: var(--c-cyan);
  background: rgba(63, 227, 210, 0.1);
}

.page-faq .faq-q[aria-expanded="true"] .faq-q__icon::before {
  background: var(--c-cyan);
}

.page-faq .faq-q[aria-expanded="true"] .faq-q__icon::after {
  transform: translateX(-50%) scaleY(0);
  opacity: 0;
}

/* ---------- 答案纸面 ---------- */
.page-faq .faq-panel {
  padding: 0 0 clamp(1rem, 2.5vw, 1.5rem);
}

.page-faq .faq-panel__inner {
  max-width: 72ch;
  margin-left: 0.25rem;
  padding: clamp(0.9rem, 2.6vw, 1.5rem) clamp(1rem, 3vw, 1.6rem);
  background: var(--c-paper);
  color: var(--c-paper-ink);
  border: 1px solid var(--c-paper-ink);
  box-shadow: 7px 7px 0 rgba(5, 21, 32, 0.55);
  font-size: 0.9375rem;
  line-height: 1.78;
}

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

.page-faq .faq-panel__inner p + p {
  margin-top: 0.7rem;
}

.page-faq .faq-panel__inner a {
  color: var(--c-paper-ink);
  text-decoration: none;
  border-bottom: 2px solid var(--c-orange);
}

.page-faq .faq-panel__inner a:hover {
  border-bottom-color: var(--c-paper-ink);
}

.page-faq .faq-k {
  font-family: var(--font-mono);
  font-size: 0.95em;
  padding: 0 0.25em;
  background: rgba(10, 36, 54, 0.09);
  color: var(--c-paper-ink);
}

/* ---------- 章节配图 ---------- */
.page-faq .faq-figure {
  position: relative;
  margin: clamp(1.25rem, 3vw, 2rem) 0 0;
  border: 1px solid var(--c-line);
  background: var(--c-mid);
}

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

/* ---------- 继续查看 ---------- */
.page-faq .faq-next {
  padding-block: clamp(1.75rem, 4vw, 3rem) clamp(2.5rem, 6vw, 4rem);
  border-top: 1px solid var(--c-line);
}

.page-faq .faq-next__title {
  margin: 0 0 0.875rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.0625rem, 2.8vw, 1.375rem);
  letter-spacing: 0.01em;
  color: var(--c-text);
}

.page-faq .faq-next__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--c-line);
}

.page-faq .faq-next__item {
  border-bottom: 1px solid var(--c-line);
}

.page-faq .faq-next__link {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.35rem 0.75rem;
  align-items: baseline;
  padding: 0.85rem 0.25rem;
  text-decoration: none;
  color: var(--c-text-dim);
  transition: color var(--t-fast) var(--ease), padding-left var(--t-fast) var(--ease);
}

.page-faq .faq-next__link:hover {
  color: var(--c-cyan);
  padding-left: 0.6rem;
}

.page-faq .faq-next__idx {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--c-orange);
}

.page-faq .faq-next__name {
  font-size: 0.9375rem;
  font-weight: 500;
}

.page-faq .faq-next__hint {
  grid-column: 2;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: var(--c-text-mute);
}

/* ---------- 响应式 ---------- */
@media (max-width: 560px) {
  .page-faq .faq-group__desc {
    grid-column: 1 / -1;
  }

  .page-faq .faq-hero__media {
    box-shadow: 6px 6px 0 rgba(5, 21, 32, 0.6);
  }

  .page-faq .faq-panel__inner {
    margin-left: 0;
    box-shadow: 5px 5px 0 rgba(5, 21, 32, 0.55);
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1fr) clamp(200px, 22vw, 280px);
  }

  .page-faq .faq-next__link {
    grid-template-columns: auto minmax(0, 1fr) auto;
  }

  .page-faq .faq-next__hint {
    grid-column: 3;
    align-self: center;
  }
}

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

  .page-faq .faq-index__link:hover,
  .page-faq .faq-next__link:hover {
    transform: none;
  }
}