.page-faq {
  --faq-hair: rgba(43, 232, 200, 0.14);
  --faq-soft: rgba(43, 232, 200, 0.05);
  padding-bottom: clamp(3rem, 8vw, 6rem);
}

/* ---------- 页头 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(1.25rem, 3.5vw, 2.5rem) 0 clamp(1rem, 3vw, 2rem);
}

.page-faq .eyebrow {
  margin: 0 0 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-faq .faq-hero h1 {
  margin: 0 0 1rem;
  max-width: 20ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.9rem, 6.4vw, 4rem);
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-faq .faq-hero__lede {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(0.9375rem, 1.6vw, 1.0625rem);
  line-height: 1.8;
  color: var(--mist);
}

.page-faq .faq-hero__side {
  display: none;
}

.page-faq .faq-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(8.5rem, 1fr));
  gap: 1px;
  margin-top: clamp(1.5rem, 4vw, 2.25rem);
  background: var(--faq-hair);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-faq .faq-stat {
  background: var(--board);
  padding: 0.9rem 1rem 1rem;
}

.page-faq .faq-stat__v {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.35rem, 3.6vw, 1.9rem);
  line-height: 1.1;
  color: var(--cyan);
}

.page-faq .faq-stat__v--signal {
  color: var(--orange);
}

.page-faq .faq-stat__l {
  display: block;
  margin-top: 0.35rem;
  font-size: 0.8125rem;
  line-height: 1.55;
  color: var(--mist);
}

/* ---------- 栅格 ---------- */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 3rem);
  margin-top: clamp(1.25rem, 3.5vw, 2.25rem);
}

/* ---------- 索引卡片 ---------- */
.page-faq .faq-item {
  position: relative;
  padding-left: 1.125rem;
  margin-bottom: 1rem;
  scroll-margin-top: calc(var(--topbar-h) + 1.25rem);
}

.page-faq .faq-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7rem;
  width: 3px;
  height: 1.35rem;
  border-radius: 2px;
  background: var(--mute);
  transition: height var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-faq .faq-item:has(.faq-details[open])::before {
  height: calc(100% - 0.85rem);
  background: var(--cyan);
}

.page-faq .faq-details {
  background: var(--board);
  border: var(--edge);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-faq .faq-summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.875rem;
  padding: 1.05rem 1.125rem 1.05rem 1rem;
  cursor: pointer;
  list-style: none;
  transition: background-color var(--dur) var(--ease);
}

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

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

.page-faq .faq-summary:hover {
  background: var(--faq-soft);
}

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

.page-faq .faq-details[open] > .faq-summary {
  padding-bottom: 0.5rem;
}

.page-faq .faq-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1rem, 2.6vw, 1.25rem);
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-faq .faq-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.0625rem, 2.5vw, 1.4rem);
  line-height: 1.35;
  color: var(--paper);
  transition: color var(--dur) var(--ease);
}

.page-faq .faq-details[open] > .faq-summary .faq-title {
  color: var(--cyan);
}

.page-faq .faq-toggle {
  position: relative;
  width: 1.125rem;
  height: 1.125rem;
  flex: none;
}

.page-faq .faq-toggle::before,
.page-faq .faq-toggle::after {
  content: "";
  position: absolute;
  background: var(--cyan-dim);
  border-radius: 2px;
  transition: transform var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-faq .faq-toggle::before {
  left: 0;
  top: 50%;
  width: 100%;
  height: 2px;
  margin-top: -1px;
}

.page-faq .faq-toggle::after {
  top: 0;
  left: 50%;
  width: 2px;
  height: 100%;
  margin-left: -1px;
}

.page-faq .faq-details[open] .faq-toggle::before {
  background: var(--orange);
}

.page-faq .faq-details[open] .faq-toggle::after {
  transform: scaleY(0);
}

/* ---------- 展开内容 ---------- */
.page-faq .faq-body {
  padding: 0 1.125rem 1.25rem 1rem;
}

.page-faq .faq-lead {
  margin: 0 0 1rem;
  max-width: 68ch;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-faq .faq-sub {
  margin: 1.125rem 0 0.5rem;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--paper);
}

/* 勾选式步骤 */
.page-faq .steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
}

.page-faq .step__label {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--mist);
  cursor: pointer;
}

.page-faq .step__check {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
}

.page-faq .step__dot {
  flex: none;
  width: 0.9rem;
  height: 0.9rem;
  margin-top: 0.42rem;
  border-radius: 50%;
  border: 2px solid var(--orange);
  transition: background-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-faq .step__check:focus-visible + .step__dot {
  outline: 2px solid var(--orange-soft);
  outline-offset: 3px;
}

.page-faq .step__label:has(.step__check:checked) .step__dot {
  background: var(--orange);
  box-shadow: inset 0 0 0 3px var(--board);
}

.page-faq .step__label:has(.step__check:checked) .step__text {
  color: var(--mute);
}

.page-faq .step__text strong {
  display: block;
  margin-bottom: 0.1rem;
  font-weight: 600;
  color: var(--paper);
}

.page-faq .step__label:has(.step__check:checked) .step__text strong {
  color: var(--mist);
}

/* 编号步骤 */
.page-faq .faq-steps {
  list-style: none;
  counter-reset: faq-step;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}

.page-faq .faq-steps li {
  counter-increment: faq-step;
  position: relative;
  padding-left: 1.85rem;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--mist);
}

.page-faq .faq-steps li::before {
  content: counter(faq-step);
  position: absolute;
  left: 0;
  top: 0.2rem;
  width: 1.15rem;
  height: 1.15rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--orange);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
}

.page-faq .faq-steps strong {
  color: var(--paper);
  font-weight: 600;
}

/* 备注列表 */
.page-faq .faq-notes {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.5rem;
}

.page-faq .faq-notes--tight {
  margin-top: 0.5rem;
}

.page-faq .faq-notes li {
  position: relative;
  padding-left: 1rem;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--mute);
}

.page-faq .faq-notes li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6rem;
  width: 0.4rem;
  height: 0.4rem;
  border-radius: 50%;
  background: var(--cyan-dim);
}

/* 字段说明 */
.page-faq .faq-facts {
  margin: 0;
  display: grid;
  gap: 0.85rem;
}

.page-faq .faq-facts__row {
  display: grid;
  gap: 0.2rem;
}

.page-faq .faq-facts dt {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-faq .faq-facts dd {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--mist);
}

/* 图片 */
.page-faq .faq-figure {
  margin: 1.25rem 0 0;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-m);
  object-fit: cover;
  background: var(--raise);
}

.page-faq .faq-figure__cap {
  margin-top: 0.6rem;
  font-size: 0.8125rem;
  line-height: 1.65;
  color: var(--mute);
}

/* 链接与行动 */
.page-faq .faq-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--faq-hair);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-faq .faq-link:hover,
.page-faq .faq-link:focus-visible {
  color: var(--orange-soft);
  border-bottom-color: var(--orange-soft);
}

.page-faq .faq-mail {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--orange);
  text-decoration: none;
  word-break: break-all;
  transition: color var(--dur) var(--ease);
}

.page-faq .faq-mail:hover,
.page-faq .faq-mail:focus-visible {
  color: var(--orange-soft);
}

.page-faq .faq-more {
  margin: 1rem 0 0;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--mute);
}

.page-faq .faq-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.25rem;
}

/* ---------- 侧栏索引 ---------- */
.page-faq .faq-aside {
  display: grid;
  gap: 1rem;
}

.page-faq .faq-index {
  background: var(--raise);
  border: var(--edge);
  border-radius: var(--radius-m);
  padding: 1.125rem 1.125rem 1.25rem;
}

.page-faq .faq-index__title {
  margin: 0 0 0.875rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-faq .faq-index__list {
  list-style: none;
  counter-reset: faq-idx;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.45rem;
}

.page-faq .faq-index__link {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  padding: 0.25rem 0;
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--mist);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.page-faq .faq-index__link::before {
  counter-increment: faq-idx;
  content: counter(faq-idx, decimal-leading-zero);
  flex: none;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--mute);
  transition: color var(--dur) var(--ease);
}

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

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

/* ---------- 响应式 ---------- */
@media (max-width: 599px) {
  .page-faq .faq-item {
    padding-left: 0.75rem;
  }

  .page-faq .faq-item::before {
    width: 2px;
  }

  .page-faq .faq-summary {
    gap: 0.65rem;
    padding: 0.95rem 1rem;
  }

  .page-faq .faq-body {
    padding: 0 1rem 1.125rem;
  }

  .page-faq .faq-index__list {
    grid-template-columns: repeat(auto-fit, minmax(8.5rem, 1fr));
    gap: 0.25rem 1rem;
  }
}

@media (min-width: 600px) {
  .page-faq .faq-facts__row {
    grid-template-columns: 7.5rem minmax(0, 1fr);
    gap: 1rem;
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-layout {
    grid-template-columns: minmax(0, 1fr) 16.5rem;
    align-items: start;
  }

  .page-faq .faq-aside {
    position: sticky;
    top: calc(var(--topbar-h) + 1.25rem);
  }

  .page-faq .faq-hero {
    padding-right: 3.5rem;
  }

  .page-faq .faq-hero__side {
    display: block;
    position: absolute;
    right: 0;
    top: clamp(1.25rem, 3.5vw, 2.5rem);
    margin: 0;
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: 0.68rem;
    letter-spacing: 0.32em;
    color: var(--cyan-dim);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item::before,
  .page-faq .faq-toggle::before,
  .page-faq .faq-toggle::after,
  .page-faq .step__dot,
  .page-faq .faq-summary,
  .page-faq .faq-title,
  .page-faq .faq-link,
  .page-faq .faq-mail,
  .page-faq .faq-index__link,
  .page-faq .faq-index__link::before {
    transition: none;
  }
}