.page-faq {
  --faq-space: clamp(1.25rem, 3.5vw, 2rem);
  --faq-space-lg: clamp(2rem, 5.5vw, 3.25rem);
  display: block;
}

/* ---------- 页头 ---------- */
.page-faq .faq-hero {
  display: grid;
  gap: var(--faq-space);
  padding-block: var(--faq-space-lg) var(--faq-space);
  border-bottom: 1px solid var(--line-steel);
}

.page-faq .faq-hero__text {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  min-width: 0;
}

.page-faq .faq-hero__eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--pulse-cyan);
}

.page-faq .faq-hero__title {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.25;
  font-size: clamp(1.7rem, 5vw, 2.85rem);
  color: var(--text-white);
}

.page-faq .faq-hero__lead {
  margin: 0;
  max-width: 48ch;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--mist-300);
}

.page-faq .faq-hero__media,
.page-faq .faq-group__media {
  margin: 0;
  border: 1px solid var(--line-steel);
  background: var(--ink-900);
}

.page-faq .faq-hero__media img,
.page-faq .faq-group__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  background: var(--ink-800);
}

.page-faq .faq-hero__media .media-frame__caption,
.page-faq .faq-group__media .media-frame__caption {
  padding: 0.6rem 0.75rem;
  border-top: 1px solid var(--line-steel);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  line-height: 1.5;
  color: var(--mist-300);
}

@media (min-width: 60rem) {
  .page-faq .faq-hero {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: end;
  }
}

/* ---------- 问题索引带 ---------- */
.page-faq .faq-index {
  padding-block: var(--faq-space) 0;
}

.page-faq .faq-index__head {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding-bottom: 0.75rem;
}

.page-faq .faq-index__title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  color: var(--mist-300);
  flex: none;
}

.page-faq .faq-index__rule {
  flex: 1 1 auto;
  height: 1px;
  background: var(--line-steel);
}

.page-faq .faq-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  border-top: 1px solid var(--line-steel);
}

.page-faq .faq-index__item {
  border-bottom: 1px solid var(--line-steel);
  min-width: 0;
}

.page-faq .faq-index__link {
  display: grid;
  grid-template-columns: 2.25rem 1fr auto;
  gap: 0.6rem;
  align-items: baseline;
  padding: 0.9rem 0.35rem;
  text-decoration: none;
  color: var(--text-white);
  border-left: 2px solid transparent;
  transition: color var(--dur) ease-out, background-color var(--dur) ease-out, border-color var(--dur) ease-out;
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  background: var(--ink-800);
  color: var(--pulse-cyan);
  border-left-color: var(--pulse-cyan);
}

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

.page-faq .faq-index__num {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--signal-amber);
}

.page-faq .faq-index__label {
  font-weight: 600;
  font-size: 0.98rem;
  line-height: 1.5;
}

.page-faq .faq-index__arrow {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--mist-300);
}

@media (min-width: 40rem) {
  .page-faq .faq-index__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: var(--faq-space);
  }
}

/* ---------- 问题分组 ---------- */
.page-faq .faq-groups {
  display: grid;
  gap: var(--faq-space-lg) var(--faq-space);
  padding-block: var(--faq-space-lg);
}

.page-faq .faq-group {
  min-width: 0;
  border-top: 2px solid var(--line-steel);
  padding-top: 1rem;
}

.page-faq .faq-group__head {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  margin: 0;
}

.page-faq .faq-group__num {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--pulse-cyan);
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 600;
  letter-spacing: -0.01em;
  font-size: clamp(1.15rem, 2.6vw, 1.35rem);
  color: var(--text-white);
}

.page-faq .faq-group__note {
  margin: 0.5rem 0 0.9rem;
  font-size: 0.85rem;
  line-height: 1.65;
  color: var(--mist-300);
}

.page-faq .faq-group__list {
  display: grid;
  gap: 0.5rem;
}

.page-faq .faq-group__body {
  display: grid;
  gap: var(--faq-space);
  margin-top: 0.9rem;
}

/* ---------- 折叠问答 ---------- */
.page-faq .faq-q {
  position: relative;
  background: var(--ink-900);
  border: 1px solid var(--line-steel);
  transition: background-color var(--dur) ease-out, border-color var(--dur) ease-out;
}

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

.page-faq .faq-q[open] {
  background: var(--ink-800);
}

.page-faq .faq-q[open]::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 3px;
  background: var(--pulse-cyan);
}

.page-faq .faq-q > .disclosure__summary {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.8rem 0.9rem;
  cursor: pointer;
  list-style: none;
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.55;
  color: var(--text-white);
  transition: color var(--dur) ease-out;
}

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

.page-faq .faq-q > .disclosure__summary::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--signal-amber);
}

.page-faq .faq-q[open] > .disclosure__summary {
  color: var(--text-white);
}

.page-faq .faq-q[open] > .disclosure__summary::after {
  content: "–";
  color: var(--pulse-cyan);
}

.page-faq .faq-q > .disclosure__summary:focus-visible {
  outline: 2px solid var(--pulse-cyan);
  outline-offset: -2px;
}

.page-faq .faq-q > .disclosure__body {
  padding: 0 0.9rem 0.95rem;
  border-top: 1px solid var(--line-steel);
  padding-top: 0.7rem;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--mist-300);
}

.page-faq .faq-q > .disclosure__body p {
  margin: 0;
}

.page-faq .faq-q > .disclosure__body a {
  color: var(--pulse-cyan);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.page-faq .faq-q > .disclosure__body a:hover {
  color: var(--signal-amber);
}

.page-faq .faq-q > .disclosure__body a:focus-visible {
  outline: 2px solid var(--pulse-cyan);
  outline-offset: 2px;
}

/* ---------- 步骤列表 ---------- */
.page-faq .faq-steps {
  list-style: none;
  counter-reset: faq-step;
  margin: 0.7rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.4rem;
}

.page-faq .faq-steps > li {
  counter-increment: faq-step;
  display: grid;
  grid-template-columns: 1.9rem minmax(0, 1fr);
  gap: 0.5rem;
  align-items: baseline;
}

.page-faq .faq-steps > li::before {
  content: counter(faq-step, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--pulse-cyan);
  letter-spacing: 0.04em;
}

/* ---------- 响应式栅格 ---------- */
@media (min-width: 40rem) {
  .page-faq .faq-groups {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 60rem) {
  .page-faq .faq-groups {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-faq .faq-group--contact {
    grid-column: 1 / -1;
  }

  .page-faq .faq-group--contact .faq-group__body {
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-index__link,
  .page-faq .faq-q,
  .page-faq .faq-q > .disclosure__summary {
    transition: none;
  }
}