.page-faq {
  --faq-grid-alpha: rgba(29, 142, 165, 0.07);
  --faq-card-bg: rgba(18, 42, 58, 0.72);
  background-color: var(--color-abyss);
  color: var(--color-frost);
}

/* ===== 首屏 ===== */
.page-faq .faq-hero {
  padding-top: calc(var(--header-h) + clamp(32px, 6vw, 72px));
  padding-bottom: clamp(40px, 6vw, 80px);
  background-image:
    linear-gradient(var(--faq-grid-alpha) 1px, transparent 1px),
    linear-gradient(90deg, var(--faq-grid-alpha) 1px, transparent 1px);
  background-size: 48px 48px;
  border-bottom: 1px solid var(--border-cyan);
}

.page-faq .faq-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 56px);
  margin-top: clamp(24px, 4vw, 48px);
}

.page-faq .faq-hero h1 {
  font-family: var(--font-display);
  font-size: var(--text-display);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--color-frost);
  margin: 16px 0 20px;
  max-width: 12ch;
}

.page-faq .faq-hero__lead {
  font-size: 18px;
  line-height: 1.75;
  color: var(--color-steel);
  max-width: 52ch;
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-faq .faq-hero__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
  align-self: end;
}

.page-faq .faq-hero__stats .stat-card {
  display: flex;
  align-items: baseline;
  gap: 14px;
  background: var(--faq-card-bg);
  border: 1px solid var(--border-cyan);
  padding: 18px 20px;
}

.page-faq .faq-hero__stats .stat-card__number {
  font-family: var(--font-mono);
  font-size: 34px;
  line-height: 1;
  min-width: 4ch;
}

.page-faq .stat-card__number--lime { color: var(--color-lime); }
.page-faq .stat-card__number--orange { color: var(--color-orange); }

.page-faq .stat-card__label {
  color: var(--color-steel);
  font-size: 14px;
  line-height: 1.5;
}

/* ===== 主体两栏 ===== */
.page-faq .faq-body {
  padding: clamp(48px, 8vw, 96px) 0;
}

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 64px);
  align-items: start;
}

/* ===== 左侧操作示意 ===== */
.page-faq .faq-guide {
  position: static;
}

.page-faq .faq-guide__card {
  background: linear-gradient(160deg, rgba(29, 142, 165, 0.08), rgba(18, 42, 58, 0.85));
  border: 1px solid var(--border-cyan);
  padding: clamp(20px, 3vw, 28px);
  position: relative;
}

.page-faq .faq-guide__card::before {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  width: 40px;
  height: 6px;
  background: var(--color-lime);
}

.page-faq .faq-guide h2 {
  font-family: var(--font-display);
  font-size: 24px;
  line-height: 1.2;
  margin: 0 0 10px;
  color: var(--color-frost);
}

.page-faq .faq-guide__lede {
  color: var(--color-steel);
  font-size: 14px;
  line-height: 1.6;
  margin-bottom: 20px;
}

.page-faq .faq-guide__media {
  border: 1px solid var(--border-cyan);
  background: var(--color-navy);
  margin-bottom: 20px;
}

.page-faq .faq-guide__media img {
  width: 100%;
  height: auto;
  display: block;
}

.page-faq .faq-guide__steps {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-faq .faq-guide__step {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 14px;
  position: relative;
  padding-bottom: 18px;
}

.page-faq .faq-guide__step:not(:last-child)::after {
  content: "";
  position: absolute;
  left: 21px;
  top: 44px;
  bottom: 4px;
  width: 1px;
  background: var(--color-cyan);
  opacity: 0.5;
}

.page-faq .faq-guide__node {
  width: 44px;
  height: 44px;
  color: var(--color-lime);
  display: block;
}

.page-faq .faq-guide__node svg {
  width: 100%;
  height: 100%;
  display: block;
}

.page-faq .faq-guide__step-text strong {
  display: block;
  color: var(--color-frost);
  font-size: 16px;
  margin-bottom: 4px;
}

.page-faq .faq-guide__step-text > span {
  color: var(--color-steel);
  font-size: 14px;
  line-height: 1.6;
}

.page-faq .faq-guide__note {
  margin-top: 16px;
  padding: 14px 16px;
  border-left: 3px solid var(--color-orange);
  background: rgba(255, 106, 61, 0.08);
  color: var(--color-steel);
  font-size: 14px;
  line-height: 1.6;
}

/* ===== 右侧问题列表 ===== */
.page-faq .faq-list {
  min-width: 0;
}

.page-faq .faq-list__head {
  margin-bottom: 16px;
}

.page-faq .faq-list__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  color: var(--color-steel);
  font-size: 14px;
}

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

.page-faq .faq-item:first-of-type {
  border-top: 1px solid var(--border-cyan);
}

.page-faq .faq-item summary {
  list-style: none;
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr) 28px;
  gap: 14px;
  align-items: center;
  padding: 22px 4px;
  cursor: pointer;
  transition: background var(--transition);
}

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

.page-faq .faq-item summary:hover {
  background: rgba(18, 42, 58, 0.35);
}

.page-faq .faq-item summary:focus-visible {
  outline: 2px solid var(--color-lime);
  outline-offset: -2px;
}

.page-faq .faq-item__badge {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border: 1px solid var(--color-steel);
  color: var(--color-steel);
  font-family: var(--font-mono);
  font-size: 18px;
  transition: border-color var(--transition), color var(--transition);
}

.page-faq .faq-item[open] .faq-item__badge {
  border-color: var(--color-orange);
  color: var(--color-orange);
}

.page-faq .faq-item__question {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(17px, 1.4vw, 20px);
  line-height: 1.35;
  color: var(--color-frost);
}

.page-faq .faq-item summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 22px;
  color: var(--color-steel);
  justify-self: end;
  transition: transform 300ms ease, color 300ms ease;
}

.page-faq .faq-item[open] summary::after {
  transform: rotate(45deg);
  color: var(--color-lime);
}

.page-faq .faq-item__answer {
  padding: 0 0 20px;
  color: var(--color-steel);
  line-height: 1.8;
}

.page-faq .faq-item__answer p {
  margin: 0 0 14px;
  max-width: 62ch;
}

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

.page-faq .faq-item__answer a {
  color: var(--color-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .faq-steps {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  counter-reset: faqstep;
}

.page-faq .faq-steps li {
  counter-increment: faqstep;
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px dashed rgba(29, 142, 165, 0.25);
}

.page-faq .faq-steps li::before {
  content: counter(faqstep, decimal-leading-zero);
  font-family: var(--font-mono);
  color: var(--color-lime);
  font-size: 14px;
}

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

.page-faq .faq-steps li > span {
  color: var(--color-steel);
  font-size: 15px;
  line-height: 1.7;
}

.page-faq .faq-list--plain {
  margin: 0 0 18px;
  padding-left: 20px;
  color: var(--color-steel);
}

.page-faq .faq-list--plain li {
  padding: 6px 0;
}

.page-faq .faq-list--plain li::marker {
  color: var(--color-cyan);
}

.page-faq .faq-figure {
  margin: 20px 0;
  padding: 12px;
  background: var(--color-navy);
  border: 1px solid var(--border-cyan);
}

.page-faq .faq-figure img {
  width: 100%;
  max-width: 560px;
  height: auto;
  display: block;
}

.page-faq .faq-figure figcaption {
  color: var(--color-steel);
  font-size: 13px;
  margin-top: 10px;
  text-align: right;
}

/* ===== 底部反馈模块 ===== */
.page-faq .faq-callout {
  background: var(--color-carbon);
  border-top: 1px solid var(--border-cyan);
  padding: clamp(48px, 8vw, 88px) 0;
  position: relative;
  overflow: hidden;
}

.page-faq .faq-callout__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 32px;
  justify-content: space-between;
}

.page-faq .faq-callout__copy {
  max-width: 620px;
}

.page-faq .faq-callout h2 {
  font-family: var(--font-display);
  font-size: var(--text-h2);
  line-height: 1.15;
  color: var(--color-frost);
  margin: 10px 0 16px;
}

.page-faq .faq-callout p {
  color: var(--color-steel);
  line-height: 1.7;
  max-width: 46ch;
}

.page-faq .faq-callout__actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 24px;
}

.page-faq .faq-callout__arrow {
  color: var(--color-lime);
  flex-shrink: 0;
}

/* ===== 展开动效 ===== */
.page-faq .faq-item[open] .faq-item__answer {
  animation: page-faq-answer-in 320ms ease;
}

@keyframes page-faq-answer-in {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== 响应式增强 ===== */
@media (min-width: 640px) {
  .page-faq .faq-item__answer {
    padding: 0 4px 24px 58px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-layout {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }

  .page-faq .faq-guide {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq *,
  .page-faq *::before,
  .page-faq *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}