.page-faq {
  --faq-index-w: 264px;
  --faq-gap: 20px;
  background: var(--ink-900);
  color: var(--text);
}

/* 阅读进度条：滚动到页尾转为荧光绿 */
.page-faq .faq-progress {
  position: sticky;
  top: var(--ctx-h);
  z-index: 18;
  height: 3px;
  background: var(--line-soft);
}

.page-faq .faq-progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: left center;
  background-color: var(--orange);
}

@supports (animation-timeline: scroll()) {
  .page-faq .faq-progress__bar {
    animation: faq-read-progress linear both;
    animation-timeline: scroll(root block);
  }
}

@keyframes faq-read-progress {
  0% {
    transform: scaleX(0);
    background-color: var(--orange);
  }
  82% {
    background-color: var(--orange);
  }
  100% {
    transform: scaleX(1);
    background-color: var(--lime);
  }
}

/* 首屏框景 */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(110% 82% at 94% -18%, rgba(255, 107, 44, 0.2), transparent 62%),
    radial-gradient(80% 70% at 4% 108%, rgba(47, 182, 196, 0.12), transparent 66%),
    linear-gradient(180deg, var(--ink-850), var(--ink-900));
}

.page-faq .faq-hero__inner {
  padding-block: clamp(28px, 5vw, 64px) clamp(28px, 4vw, 48px);
}

.page-faq .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--dim);
  margin-bottom: 26px;
}

.page-faq .breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-faq .breadcrumb a:hover,
.page-faq .breadcrumb a:focus-visible {
  color: var(--text);
  border-bottom-color: var(--cyan);
}

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

.page-faq .faq-hero .eyebrow {
  margin: 0 0 14px;
}

.page-faq .faq-hero__title {
  font-family: var(--font-display);
  font-size: clamp(32px, 6.2vw, 60px);
  line-height: 1.06;
  letter-spacing: 0.005em;
  font-weight: 800;
  margin: 0;
  max-width: 20ch;
}

.page-faq .faq-hero__lead {
  margin: 18px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--muted);
}

.page-faq .faq-hero__stats {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-hero__stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 14px 14px 0;
  background: var(--ink-900);
}

.page-faq .faq-hero__stat-num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.6vw, 30px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--orange);
}

.page-faq .faq-hero__stat-label {
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.page-faq .faq-hero__media {
  position: relative;
  margin: 28px 0 0;
  border: 1px solid var(--line);
  background: var(--ink-800);
  overflow: hidden;
}

.page-faq .faq-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 20 / 7;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.04);
}

.page-faq .faq-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.045) 0 1px,
    transparent 1px 4px
  );
}

/* 索引 + 答案双栏 */
.page-faq .faq-layout {
  display: grid;
  gap: 36px;
  padding-block: clamp(32px, 5vw, 64px) clamp(56px, 8vw, 96px);
}

.page-faq .faq-index__label {
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--dim);
}

.page-faq .faq-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
}

.page-faq .faq-index__item a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  min-height: 44px;
  padding: 12px 10px 12px 14px;
  border-left: 2px solid var(--line);
  border-bottom: 1px solid var(--line-soft);
  color: var(--muted);
  font-size: 15px;
  line-height: 1.5;
  text-decoration: none;
  transition: color 180ms var(--ease), border-color 180ms var(--ease), background 180ms var(--ease);
}

.page-faq .faq-index__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--dim);
  transition: color 180ms var(--ease);
}

.page-faq .faq-index__item a:hover,
.page-faq .faq-index__item a:focus-visible {
  color: var(--text);
  border-left-color: var(--orange);
  background: var(--ink-850);
}

.page-faq .faq-index__item a:hover .faq-index__num,
.page-faq .faq-index__item a:focus-visible .faq-index__num {
  color: var(--orange);
}

.page-faq .faq-index__hint {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 16px 0 0;
  font-size: 12px;
  line-height: 1.6;
  color: var(--dim);
}

/* 答案区 */
.page-faq .faq-answers {
  display: flex;
  flex-direction: column;
  gap: clamp(40px, 5vw, 60px);
  min-width: 0;
}

.page-faq .faq-group {
  scroll-margin-top: calc(var(--ctx-h) + 28px);
  min-width: 0;
}

.page-faq .faq-group__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: 14px;
  align-items: baseline;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-group__num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.4vw, 30px);
  line-height: 1;
  color: var(--orange);
  letter-spacing: -0.02em;
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(21px, 3vw, 29px);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.01em;
}

.page-faq .faq-group__desc {
  grid-column: 2;
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--muted);
  max-width: 60ch;
}

/* 折叠项 */
.page-faq .faq-item {
  position: relative;
  margin-top: 10px;
  background: var(--ink-850);
  border: 1px solid var(--line);
  border-left: 2px solid var(--line);
  transition: background 200ms var(--ease), border-color 200ms var(--ease);
}

.page-faq .faq-item::after {
  content: "";
  position: absolute;
  top: -1px;
  right: -1px;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 0 15px 15px 0;
  border-color: transparent var(--ink-900) transparent transparent;
  pointer-events: none;
}

.page-faq .faq-item:hover {
  border-color: var(--orange);
}

.page-faq .faq-item[open] {
  background: var(--ink-800);
  border-left-color: var(--orange);
}

.page-faq .faq-item__summary {
  position: relative;
  display: block;
  list-style: none;
  cursor: pointer;
  padding: 16px 48px 16px 16px;
  font-size: 17px;
  font-weight: 500;
  line-height: 1.55;
  color: var(--text);
  transition: color 180ms var(--ease);
}

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

.page-faq .faq-item__summary::after {
  content: "+";
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--orange);
}

.page-faq .faq-item[open] > .faq-item__summary::after {
  content: "−";
}

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

.page-faq .faq-item__body {
  padding: 0 16px 18px;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-faq .faq-item__body p {
  margin: 0 0 12px;
  max-width: 68ch;
}

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

.page-faq .faq-item__body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px dashed rgba(47, 182, 196, 0.6);
}

.page-faq .faq-item__body a:hover,
.page-faq .faq-item__body a:focus-visible {
  color: var(--focus);
  border-bottom-color: var(--focus);
}

.page-faq .faq-item__body .num {
  color: var(--text);
  font-size: 16px;
}

.page-faq .faq-steps {
  margin: 4px 0 0;
  padding-left: 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-width: 66ch;
}

.page-faq .faq-steps li::marker {
  color: var(--cyan);
  font-family: var(--font-mono);
}

/* 跨端同步区 */
.page-faq .faq-sync {
  display: grid;
  gap: 24px;
  margin-top: 10px;
}

.page-faq .faq-sync__col {
  min-width: 0;
}

.page-faq .faq-sync__col .faq-item:first-child {
  margin-top: 0;
}

.page-faq .faq-sync__media {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  background: var(--ink-800);
  padding-bottom: 12px;
  overflow: hidden;
}

.page-faq .faq-sync__media::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan), var(--amber), var(--orange));
}

.page-faq .faq-sync__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 25 / 16;
  object-fit: cover;
  filter: saturate(0.9) contrast(1.05);
}

.page-faq .faq-sync__caption {
  padding: 10px 14px 0;
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.03em;
  color: var(--dim);
}

/* 求助区 */
.page-faq .faq-support {
  margin-top: 10px;
  padding: clamp(20px, 3.6vw, 36px);
  display: grid;
  gap: 24px;
  background:
    radial-gradient(120% 120% at 100% 0%, rgba(184, 255, 60, 0.08), transparent 58%),
    linear-gradient(140deg, var(--ink-800), var(--ink-850));
  border: 1px solid var(--line);
  border-left: 2px solid var(--lime);
}

.page-faq .faq-support__text {
  margin: 0 0 14px;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 60ch;
}

.page-faq .faq-support__text:last-of-type {
  margin-bottom: 20px;
}

.page-faq .faq-support__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-faq .faq-support__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 1px;
  background: var(--line-soft);
  align-self: start;
}

.page-faq .faq-support__list li {
  background: var(--ink-850);
  padding: 12px 14px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--dim);
}

.page-faq .faq-support__list-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--lime);
  margin-bottom: 4px;
}

/* 响应式 */
@media (min-width: 720px) {
  .page-faq .faq-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-faq .faq-hero__stat {
    padding: 16px 16px 16px 0;
  }

  .page-faq .faq-support {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-index-w) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: calc(var(--ctx-h) + 28px);
    padding-right: 4px;
  }

  .page-faq .faq-index__item:nth-child(1) a { margin-left: 0; }
  .page-faq .faq-index__item:nth-child(2) a { margin-left: 6px; }
  .page-faq .faq-index__item:nth-child(3) a { margin-left: 12px; }
  .page-faq .faq-index__item:nth-child(4) a { margin-left: 18px; }
  .page-faq .faq-index__item:nth-child(5) a { margin-left: 24px; }
  .page-faq .faq-index__item:nth-child(6) a { margin-left: 30px; }

  .page-faq .faq-sync {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
    gap: 28px;
  }
}

@media (min-width: 1200px) {
  .page-faq .faq-answers > .faq-group:nth-child(even) {
    margin-left: 36px;
  }

  .page-faq .faq-item__summary {
    font-size: 17px;
    padding: 18px 52px 18px 20px;
  }

  .page-faq .faq-item__body {
    padding: 0 20px 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item,
  .page-faq .faq-index__item a,
  .page-faq .faq-index__num,
  .page-faq .faq-item__summary {
    transition: none;
  }

  @supports (animation-timeline: scroll()) {
    .page-faq .faq-progress__bar {
      animation: none;
      transform: scaleX(1);
      background-color: var(--lime);
    }
  }
}