.page-faq {
  --faq-rail-w: 232px;
  --faq-gap: clamp(1.25rem, 3.2vw, 3.25rem);
  --faq-hairline: 1px solid var(--rail);
  background: var(--ink);
  color: var(--paper);
}

.page-faq h1,
.page-faq h2,
.page-faq h3 {
  font-family: var(--font-display);
  letter-spacing: -0.02em;
  text-wrap: balance;
}

.page-faq p {
  line-height: 1.75;
}

/* ---------- 首屏 ---------- */
.page-faq__hero {
  position: relative;
  padding-block: clamp(1.75rem, 4vw, 3rem) clamp(2rem, 4.5vw, 3.75rem);
  background:
    radial-gradient(circle at 84% 12%, rgba(57, 230, 255, 0.16), transparent 58%),
    radial-gradient(circle at 8% 92%, rgba(110, 79, 130, 0.32), transparent 55%),
    linear-gradient(178deg, var(--ink-2) 0%, var(--ink) 64%);
  border-bottom: var(--faq-hairline);
}

.page-faq__hero .breadcrumb {
  margin-bottom: clamp(1.25rem, 3vw, 2.25rem);
}

.page-faq__hero-grid {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
  align-items: end;
}

.page-faq__hero-lead h1 {
  margin: 0.6rem 0 0;
  font-size: clamp(1.9rem, 6.4vw, 3.4rem);
  line-height: 1.14;
  color: var(--paper);
}

.page-faq__hero-lead .lede {
  margin-top: clamp(1rem, 2.4vw, 1.5rem);
  max-width: 62ch;
  font-size: clamp(0.95rem, 2.4vw, 1.0625rem);
  color: var(--steel);
}

.page-faq__facts {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(1rem, 3vw, 2.5rem);
  margin: clamp(1.5rem, 3.5vw, 2.4rem) 0 0;
  padding: 0;
  list-style: none;
}

.page-faq__fact {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding-left: 0.85rem;
  border-left: 2px solid var(--cyan);
}

.page-faq__fact-num {
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 4vw, 1.9rem);
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
}

.page-faq__fact-label {
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  color: var(--steel-dim);
}

.page-faq__hero-media {
  margin: 0;
}

.page-faq__hero-media .media-frame {
  border: var(--faq-hairline);
}

.page-faq__hero-media img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-faq__hero-media .media-frame__caption {
  margin-top: 0.7rem;
  font-size: 0.8125rem;
  color: var(--steel-dim);
}

/* ---------- 主体 ---------- */
.page-faq__body {
  padding-block: clamp(2rem, 5vw, 4.25rem);
  background:
    linear-gradient(180deg, rgba(11, 39, 64, 0.55) 0%, transparent 340px),
    var(--ink);
}

.page-faq__layout {
  display: grid;
  gap: clamp(1.5rem, 3.5vw, 3rem);
}

.page-faq__layout > * {
  min-width: 0;
}

.page-faq__rail {
  border-top: 2px solid var(--cyan);
  padding-top: 0.85rem;
}

.page-faq__rail-title {
  margin: 0 0 0.7rem;
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--steel-dim);
}

.page-faq__rail-list {
  display: flex;
  gap: 0.5rem;
  margin: 0;
  padding: 0 0 0.35rem;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-faq__rail-link {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  padding: 0.55rem 0.85rem;
  white-space: nowrap;
  border: 1px solid var(--rail);
  color: var(--steel);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-faq__rail-link:hover,
.page-faq__rail-link:focus-visible {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-faq__rail-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--gold);
}

.page-faq__rail-link:hover .page-faq__rail-num,
.page-faq__rail-link:focus-visible .page-faq__rail-num {
  color: var(--ink);
}

.page-faq__groups {
  display: grid;
  gap: clamp(2.25rem, 5vw, 3.75rem);
}

.page-faq__group {
  padding-top: clamp(1.25rem, 3vw, 1.75rem);
  border-top: 1px solid var(--rail);
  scroll-margin-top: calc(var(--header-h) + 1.5rem);
}

.page-faq__group-head {
  display: grid;
  gap: 0.6rem;
  margin-bottom: clamp(1.1rem, 2.6vw, 1.75rem);
}

.page-faq__group-head .index {
  font-size: clamp(2.25rem, 6vw, 3.4rem);
  line-height: 0.9;
  display: block;
}

.page-faq__group-intro h2 {
  margin: 0;
  font-size: clamp(1.35rem, 4vw, 1.9rem);
  line-height: 1.24;
  color: var(--paper);
}

.page-faq__group-intro p {
  margin: 0.6rem 0 0;
  max-width: 56ch;
  font-size: 0.9375rem;
  color: var(--steel);
}

/* ---------- 步骤条 ---------- */
.page-faq__steps {
  display: grid;
  gap: 0.75rem;
  margin: 0 0 clamp(1.25rem, 3vw, 1.75rem);
  padding: 0;
  list-style: none;
}

.page-faq__step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.85rem;
  align-items: start;
  padding: 0.85rem 1rem;
  background: var(--panel);
  border-left: 2px solid var(--cyan);
}

.page-faq__step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.85rem;
  height: 1.85rem;
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--ink);
  background: var(--cyan);
}

.page-faq__step-body h3 {
  margin: 0;
  font-size: 1rem;
  color: var(--paper);
}

.page-faq__step-body p {
  margin: 0.3rem 0 0;
  font-size: 0.875rem;
  color: var(--steel);
}

.page-faq__figure {
  margin: 0 0 clamp(1.25rem, 3vw, 1.75rem);
}

.page-faq__figure .media-frame {
  border: var(--faq-hairline);
}

.page-faq__figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-faq__figure .media-frame__caption {
  margin-top: 0.65rem;
  font-size: 0.8125rem;
  color: var(--steel-dim);
}

/* ---------- 面板 ---------- */
.page-faq__panel {
  margin: 0 0 clamp(1.25rem, 3vw, 1.75rem);
  padding: clamp(1rem, 2.6vw, 1.5rem);
  border-left: 3px solid var(--gold);
}

.page-faq__panel-title {
  margin: 0 0 0.85rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.page-faq__panel-list {
  display: grid;
  gap: 0.65rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq__panel-item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.35rem 0.75rem;
  padding-bottom: 0.65rem;
  border-bottom: 1px solid rgba(30, 74, 102, 0.55);
}

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

.page-faq__panel-item strong {
  font-size: 0.9375rem;
  color: var(--paper);
  min-width: 6.5em;
}

.page-faq__panel-item span {
  font-size: 0.875rem;
  color: var(--steel);
}

.page-faq__panel-note {
  margin: 0.9rem 0 0;
  font-size: 0.8125rem;
  color: var(--steel-dim);
}

.page-faq__panel-note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(57, 230, 255, 0.45);
}

.page-faq__panel-note a:hover,
.page-faq__panel-note a:focus-visible {
  color: var(--cyan-soft);
  border-bottom-color: var(--cyan-soft);
}

/* ---------- 编号顺序列表 ---------- */
.page-faq__order {
  counter-reset: faq-order;
  display: grid;
  gap: 0.55rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq__order-item {
  counter-increment: faq-order;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.7rem;
  align-items: baseline;
  font-size: 0.9375rem;
  color: var(--steel);
}

.page-faq__order-item::before {
  content: counter(faq-order, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--gold);
}

.page-faq__order--check .page-faq__order-item::before {
  content: counter(faq-order);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.6rem;
  height: 1.6rem;
  color: var(--ink);
  background: var(--cyan);
}

.page-faq__order--check {
  margin-bottom: clamp(1.25rem, 3vw, 1.75rem);
}

/* ---------- 手风琴 ---------- */
.page-faq__list {
  display: grid;
  gap: 0;
  border-top: var(--faq-hairline);
}

.page-faq__item {
  border-bottom: var(--faq-hairline);
}

.page-faq__q {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1rem;
  align-items: center;
  padding: 1.05rem 0;
  cursor: pointer;
  list-style: none;
  transition: color 0.2s var(--ease);
}

.page-faq__q::-webkit-details-marker {
  display: none;
}

.page-faq__q-text {
  margin: 0;
  font-size: clamp(0.95rem, 2.6vw, 1.0625rem);
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper);
  transition: color 0.2s var(--ease);
}

.page-faq__q::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1.35rem;
  line-height: 1;
  color: var(--cyan);
  transition: color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-faq__q:hover .page-faq__q-text,
.page-faq__q:focus-visible .page-faq__q-text {
  color: var(--cyan-soft);
}

.page-faq__item[open] > .page-faq__q::after {
  content: "−";
  color: var(--gold);
  transform: rotate(180deg);
}

.page-faq__item[open] > .page-faq__q .page-faq__q-text {
  color: var(--cyan-soft);
}

.page-faq__a {
  padding: 0 0 1.15rem;
  font-size: 0.9375rem;
  color: var(--steel);
}

.page-faq__a p {
  margin: 0;
  max-width: 68ch;
}

.page-faq__a p + p {
  margin-top: 0.6rem;
}

/* ---------- 收尾 ---------- */
.page-faq__next {
  padding-block: clamp(2.5rem, 5.5vw, 4.5rem);
  background:
    linear-gradient(160deg, rgba(110, 79, 130, 0.38) 0%, rgba(6, 24, 38, 0.9) 58%),
    var(--ink-2);
  border-top: 1px solid var(--rail);
}

.page-faq__next h2 {
  margin: 0;
  font-size: clamp(1.4rem, 4.2vw, 2.1rem);
  color: var(--paper);
}

.page-faq__hint {
  margin: 0.7rem 0 1.6rem;
  max-width: 54ch;
  font-size: 0.9375rem;
  color: var(--steel);
}

.page-faq__links {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--rail);
}

.page-faq__link {
  display: grid;
  gap: 0.25rem;
  padding: 1rem 2.4rem 1rem 0;
  border-bottom: 1px solid var(--rail);
  text-decoration: none;
  position: relative;
  transition: background-color 0.25s var(--ease), padding-left 0.25s var(--ease);
}

.page-faq__link::after {
  content: "→";
  position: absolute;
  right: 0.4rem;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  color: var(--gold);
  transition: transform 0.25s var(--ease);
}

.page-faq__link:hover,
.page-faq__link:focus-visible {
  background: rgba(57, 230, 255, 0.07);
  padding-left: 0.85rem;
}

.page-faq__link:hover::after,
.page-faq__link:focus-visible::after {
  transform: translate(0.3rem, -50%);
}

.page-faq__link-title {
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--paper);
}

.page-faq__link:hover .page-faq__link-title,
.page-faq__link:focus-visible .page-faq__link-title {
  color: var(--cyan-soft);
}

.page-faq__link-note {
  font-size: 0.875rem;
  color: var(--steel-dim);
}

.page-faq a:focus-visible,
.page-faq summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-faq__panel-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(1rem, 3vw, 2rem);
  }

  .page-faq__panel-item:nth-last-child(2) {
    padding-bottom: 0;
    border-bottom: 0;
  }

  .page-faq__links {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    border-top: 0;
    gap: 1px;
    background: var(--rail);
  }

  .page-faq__link {
    background: var(--ink);
    border-bottom: 0;
    padding: 1.15rem 1.15rem 1.15rem;
  }

  .page-faq__link::after {
    right: 0.8rem;
  }

  .page-faq__link:hover,
  .page-faq__link:focus-visible {
    padding-left: 1.4rem;
  }
}

@media (min-width: 880px) {
  .page-faq__hero-grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: clamp(2rem, 4vw, 4rem);
  }

  .page-faq__group-head {
    grid-template-columns: auto minmax(0, 1fr);
    gap: clamp(1rem, 2.4vw, 1.9rem);
    align-items: start;
  }

  .page-faq__group-head .index {
    padding-top: 0.15rem;
  }

  .page-faq__steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.9rem;
  }

  .page-faq__step {
    grid-template-columns: minmax(0, 1fr);
    gap: 0.55rem;
    padding: 1rem;
  }
}

@media (min-width: 1040px) {
  .page-faq__layout {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: var(--faq-gap);
    align-items: start;
  }

  .page-faq__rail {
    position: sticky;
    top: calc(var(--header-h) + 1.5rem);
    align-self: start;
  }

  .page-faq__rail-list {
    flex-direction: column;
    gap: 0;
    overflow-x: visible;
    padding-bottom: 0;
    border-left: 1px solid var(--rail);
  }

  .page-faq__rail-link {
    border: 0;
    border-left: 2px solid transparent;
    margin-left: -1px;
    padding: 0.6rem 0.85rem;
    white-space: normal;
  }

  .page-faq__rail-link:hover,
  .page-faq__rail-link:focus-visible {
    background: rgba(57, 230, 255, 0.1);
    color: var(--cyan-soft);
    border-left-color: var(--cyan);
  }

  .page-faq__rail-link:hover .page-faq__rail-num,
  .page-faq__rail-link:focus-visible .page-faq__rail-num {
    color: var(--gold);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq *,
  .page-faq *::before,
  .page-faq *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}