.page-faq {
  --faq-rail-w: 200px;
  --faq-line: 1px solid var(--ink-200);
  padding-bottom: 88px;
}

.page-faq .faq-crumb {
  padding-top: 20px;
}

.page-faq .faq-hero {
  position: relative;
  margin-top: 16px;
  padding: 40px 0 56px;
  border-bottom: var(--faq-line);
  background:
    radial-gradient(820px 300px at 10% 0%, rgba(30, 75, 224, 0.26), transparent 72%),
    radial-gradient(600px 260px at 88% 18%, rgba(23, 179, 168, 0.14), transparent 70%),
    linear-gradient(180deg, var(--ink-100), var(--ink-000));
}

.page-faq .faq-hero__inner {
  max-width: 900px;
}

.page-faq .faq-hero__index {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-faq .faq-hero__title {
  margin: 0 0 20px;
  font-size: clamp(28px, 6.4vw, 54px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--text);
}

.page-faq .faq-hero__lead {
  margin: 0;
  max-width: 62ch;
  font-size: 17px;
  line-height: 1.85;
  color: var(--text-dim);
}

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

.page-faq .faq-hero__meta {
  margin: 24px 0 0;
  padding-left: 14px;
  border-left: 3px solid var(--lime);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--text-dim);
}

/* 布局：移动端索引在上，桌面端索引靠右 */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  grid-template-areas:
    "rail"
    "body";
  gap: 28px;
  padding-top: 36px;
}

.page-faq .faq-rail {
  grid-area: rail;
  min-width: 0;
  border: var(--faq-line);
  background: var(--ink-100);
  padding: 16px 14px;
}

.page-faq .faq-rail__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--text-dim);
}

.page-faq .faq-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 6px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-rail__link {
  display: flex;
  align-items: center;
  gap: 9px;
  min-height: 44px;
  padding: 9px 12px;
  border-left: 2px solid transparent;
  color: var(--text-dim);
  text-decoration: none;
  font-size: 14px;
  white-space: nowrap;
  transition: color 0.18s var(--ease), background-color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  color: var(--text);
  background: var(--ink-200);
}

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

.page-faq .faq-rail__link.is-active {
  color: var(--text);
  border-left-color: var(--cyan);
  background: rgba(23, 179, 168, 0.09);
}

.page-faq .faq-rail__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-faq .faq-rail__help {
  margin-top: 14px;
  padding-top: 13px;
  border-top: var(--faq-line);
}

.page-faq .faq-rail__help-title {
  margin: 0 0 8px;
  font-size: 13px;
  color: var(--text-dim);
}

.page-faq .faq-rail__help-link {
  color: var(--lime);
  font-size: 13px;
  text-decoration: none;
  border-bottom: 1px solid rgba(184, 255, 77, 0.4);
}

.page-faq .faq-body {
  grid-area: body;
  min-width: 0;
}

/* 章节 */
.page-faq .faq-section + .faq-section {
  margin-top: 52px;
}

.page-faq .faq-section .chapter__head {
  display: block;
  margin-bottom: 18px;
}

.page-faq .faq-section .chapter__index {
  margin: 0 0 10px;
}

.page-faq .faq-section .chapter__title {
  margin: 0 0 14px;
  font-size: clamp(20px, 4.4vw, 28px);
  line-height: 1.3;
}

.page-faq .faq-section .chapter__rule {
  display: block;
  height: 1px;
  background: linear-gradient(90deg, var(--cobalt), var(--cyan) 55%, transparent);
}

/* 折叠面板 */
.page-faq .faq-item {
  border-top: var(--faq-line);
  border-left: 3px solid transparent;
  padding-left: 12px;
  transition: border-left-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-faq .faq-item:last-of-type {
  border-bottom: var(--faq-line);
}

.page-faq .faq-item[open] {
  border-left-color: var(--cyan);
  background: linear-gradient(90deg, rgba(23, 179, 168, 0.07), transparent 62%);
}

.page-faq .faq-item__q {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  min-height: 44px;
  padding: 18px 8px 18px 0;
  cursor: pointer;
  list-style: none;
  color: var(--text);
  font-size: 17px;
  font-weight: 600;
  line-height: 1.55;
}

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

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

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

.page-faq .faq-item__num {
  flex: none;
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-faq .faq-item__text {
  flex: 1 1 auto;
  min-width: 0;
}

.page-faq .faq-item__sign {
  position: relative;
  flex: none;
  width: 16px;
  height: 16px;
  margin-top: 5px;
}

.page-faq .faq-item__sign::before,
.page-faq .faq-item__sign::after {
  content: "";
  position: absolute;
  background: var(--text-dim);
  transition: transform 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-faq .faq-item__sign::before {
  top: 7px;
  left: 0;
  width: 16px;
  height: 2px;
}

.page-faq .faq-item__sign::after {
  top: 0;
  left: 7px;
  width: 2px;
  height: 16px;
}

.page-faq .faq-item[open] .faq-item__sign::before {
  background: var(--cyan);
}

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

.page-faq .faq-item__a {
  padding: 0 8px 24px 34px;
  color: var(--text-dim);
  font-size: 16px;
  line-height: 1.85;
}

.page-faq .faq-item__a p {
  margin: 0;
}

.page-faq .faq-item__a p + p,
.page-faq .faq-item__a p + ol {
  margin-top: 12px;
}

.page-faq .faq-item__a a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(23, 179, 168, 0.45);
}

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

/* 排查步骤 */
.page-faq .faq-steps {
  list-style: none;
  counter-reset: faqstep;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-faq .faq-steps > li {
  counter-increment: faqstep;
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  line-height: 1.75;
}

.page-faq .faq-steps > li::before {
  content: counter(faqstep, decimal-leading-zero);
  display: flex;
  align-items: center;
  justify-content: center;
  height: 26px;
  border: 1px solid var(--ink-200);
  background: var(--ink-100);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--cobalt-lit);
}

/* 图片 */
.page-faq .faq-figure {
  margin: 26px 0 0;
}

.page-faq .faq-figure__frame {
  aspect-ratio: 3 / 2;
}

.page-faq .faq-figure__frame--4-3 {
  aspect-ratio: 4 / 3;
}

.page-faq .faq-figure__cap {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  line-height: 1.7;
  color: var(--text-dim);
}

/* 人工协助块 */
.page-faq .faq-contact {
  margin-bottom: 8px;
  border: var(--faq-line);
  border-left: 3px solid var(--orange);
  background: var(--ink-100);
  padding: 22px 20px;
}

.page-faq .faq-contact__grid {
  display: grid;
  gap: 20px;
}

.page-faq .faq-contact__label {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--text-dim);
}

.page-faq .faq-contact__value {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 17px;
  letter-spacing: 0.02em;
  color: var(--text);
  overflow-wrap: anywhere;
}

.page-faq .faq-contact__value a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(184, 255, 77, 0.4);
}

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

.page-faq .faq-contact__note {
  margin: 20px 0 0;
  padding-top: 16px;
  border-top: var(--faq-line);
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-faq .faq-back {
  margin: 26px 0 0;
}

.page-faq .faq-back a {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--cobalt-lit);
  text-decoration: none;
  border-bottom: 1px solid rgba(58, 99, 255, 0.45);
}

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

/* 平板及以上 */
@media (min-width: 700px) {
  .page-faq .faq-contact__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 28px;
  }

  .page-faq .faq-item__q {
    font-size: 18px;
    padding-right: 16px;
  }

  .page-faq .faq-item__a {
    padding-right: 48px;
  }
}

/* 桌面：索引轨靠右并吸顶 */
@media (min-width: 1000px) {
  .page-faq .faq-layout {
    grid-template-columns: minmax(0, 1fr) var(--faq-rail-w);
    grid-template-areas: "body rail";
    gap: 56px;
    align-items: start;
    padding-top: 48px;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--topbar-h) + 28px);
    padding: 18px 14px;
  }

  .page-faq .faq-rail__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
  }

  .page-faq .faq-rail__link {
    white-space: normal;
  }

  .page-faq .faq-section + .faq-section {
    margin-top: 68px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item,
  .page-faq .faq-item__sign::before,
  .page-faq .faq-item__sign::after,
  .page-faq .faq-rail__link {
    transition: none;
  }
}