.page-faq {
  --faq-rail-w: 196px;
  --faq-flow-w: 780px;
  padding-block: clamp(24px, 4vw, 48px) clamp(64px, 9vw, 120px);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding-bottom: clamp(28px, 4vw, 52px);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: -30% -12% auto -12%;
  height: 460px;
  background:
    radial-gradient(58% 100% at 18% 0%, rgba(77, 225, 255, .10), transparent 70%),
    radial-gradient(48% 100% at 86% 8%, rgba(198, 255, 61, .08), transparent 72%);
  pointer-events: none;
  z-index: 0;
}

.page-faq .faq-hero-inner {
  position: relative;
  z-index: 1;
}

.page-faq .breadcrumb {
  font-size: 12.5px;
  color: var(--c-muted);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.page-faq .breadcrumb a {
  color: var(--c-muted);
  text-decoration: none;
  transition: color 180ms var(--ease);
}

.page-faq .breadcrumb a:hover {
  color: var(--c-ice);
}

.page-faq .faq-title {
  margin: 18px 0 0;
  max-width: 22ch;
  font-size: clamp(30px, 5.4vw, 58px);
  line-height: 1.16;
  font-weight: 300;
  letter-spacing: -0.01em;
  color: var(--c-white);
}

.page-faq .faq-lead {
  margin: 20px 0 0;
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--c-body);
}

.page-faq .faq-stats {
  list-style: none;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 18px;
}

.page-faq .faq-stat {
  border-top: 1px solid var(--c-line);
  padding-top: 12px;
}

.page-faq .faq-stat .stat-value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.2vw, 34px);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--c-green);
}

.page-faq .faq-stat .stat-label {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-muted);
}

/* ---------- 通用排查 ---------- */
.page-faq .faq-quick {
  margin-top: clamp(36px, 6vw, 76px);
}

.page-faq .faq-sub {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-muted);
}

.page-faq .quick-list {
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
}

.page-faq .quick-item {
  border-top: 1px solid var(--c-line);
  padding: 22px 0;
  display: grid;
  gap: 8px;
}

.page-faq .quick-item:last-child {
  border-bottom: 1px solid var(--c-line);
}

.page-faq .quick-code {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-orange);
}

.page-faq .quick-title {
  margin: 0;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--c-white);
}

.page-faq .quick-text {
  margin: 0;
  max-width: 68ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--c-body);
}

.page-faq .quick-text b {
  color: var(--c-white);
  font-weight: 600;
}

.page-faq .quick-text a {
  color: var(--c-ice);
  text-decoration: none;
  border-bottom: 1px solid var(--s-ice-line);
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-faq .quick-text a:hover {
  color: var(--c-green);
  border-bottom-color: var(--s-green-line);
}

/* ---------- 双栏主体 ---------- */
.page-faq .faq-body {
  margin-top: clamp(52px, 8vw, 104px);
}

/* 分类索引 */
.page-faq .faq-rail {
  border-top: 1px solid var(--c-line);
  border-bottom: 1px solid var(--c-line);
  padding: 12px 0;
  margin-bottom: 36px;
}

.page-faq .faq-rail-title {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--c-muted);
  text-transform: uppercase;
}

.page-faq .faq-rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.page-faq .faq-rail-list::-webkit-scrollbar {
  display: none;
}

.page-faq .faq-rail-link {
  display: flex;
  gap: 8px;
  align-items: baseline;
  white-space: nowrap;
  padding: 7px 13px;
  border: 1px solid var(--c-line);
  border-radius: 999px;
  font-size: 13px;
  color: var(--c-body);
  text-decoration: none;
  transition: color 180ms var(--ease), border-color 180ms var(--ease), background 180ms var(--ease);
}

.page-faq .faq-rail-link:hover {
  color: var(--c-white);
  border-color: var(--c-line-strong);
}

.page-faq .faq-rail-num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--c-muted);
}

.page-faq .faq-rail-link[aria-current="true"] {
  color: var(--c-orange);
  border-color: var(--s-orange-line);
  background: var(--s-orange);
}

.page-faq .faq-rail-link[aria-current="true"] .faq-rail-num {
  color: var(--c-orange);
}

/* 章节 */
.page-faq .faq-section {
  margin-bottom: clamp(48px, 7vw, 92px);
  scroll-margin-top: calc(var(--header-h) + 28px);
}

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

.page-faq .faq-section-head {
  display: grid;
  gap: 6px;
  padding-bottom: 16px;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--c-line);
}

.page-faq .faq-section-head .index-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-orange);
}

.page-faq .faq-section-head .headline {
  margin: 0;
  color: var(--c-white);
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 600;
  line-height: 1.3;
}

.page-faq .faq-section-head .faq-sub {
  margin-top: 2px;
}

/* 配图 */
.page-faq .faq-figure {
  margin: 0 0 22px;
  border: 1px solid var(--c-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--c-panel);
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-faq .faq-figure figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--c-line);
  font-size: 12px;
  line-height: 1.65;
  color: var(--c-muted);
}

/* 问答条目 */
.page-faq .faq-q {
  border-top: 1px solid var(--c-line);
}

.page-faq .faq-items > .faq-q:last-child {
  border-bottom: 1px solid var(--c-line);
}

.page-faq .faq-q > summary {
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 14px;
  align-items: start;
  padding: 20px 0;
  transition: color 180ms var(--ease);
}

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

.page-faq .faq-q > summary:hover .faq-q-text {
  color: var(--c-green);
}

.page-faq .faq-q > summary:focus-visible {
  outline: 1px solid var(--c-green);
  outline-offset: 3px;
}

.page-faq .faq-q-code {
  padding-top: 5px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--c-ice);
}

.page-faq .faq-q-text {
  font-size: 16.5px;
  font-weight: 500;
  line-height: 1.6;
  color: var(--c-white);
  transition: color 180ms var(--ease);
}

.page-faq .faq-q-mark {
  position: relative;
  width: 18px;
  height: 18px;
  margin-top: 6px;
}

.page-faq .faq-q-mark::before,
.page-faq .faq-q-mark::after {
  content: "";
  position: absolute;
  background: var(--c-muted);
  transition: transform 220ms var(--ease), background 220ms var(--ease);
}

.page-faq .faq-q-mark::before {
  left: 0;
  top: 8px;
  width: 18px;
  height: 1.5px;
}

.page-faq .faq-q-mark::after {
  left: 8px;
  top: 0;
  width: 1.5px;
  height: 18px;
}

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

.page-faq .faq-q[open] .faq-q-mark::before {
  background: var(--c-green);
}

.page-faq .faq-a {
  padding-bottom: 26px;
}

.page-faq .faq-q[open] .faq-a {
  animation: faq-reveal 260ms var(--ease) both;
}

@keyframes faq-reveal {
  from {
    opacity: 0;
    transform: translateY(-5px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.page-faq .faq-a p {
  margin: 0 0 12px;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-body);
}

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

.page-faq .faq-a b {
  color: var(--c-green);
  font-weight: 700;
  font-family: var(--font-mono);
}

.page-faq .faq-a a {
  color: var(--c-ice);
  text-decoration: none;
  border-bottom: 1px solid var(--s-ice-line);
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-faq .faq-a a:hover {
  color: var(--c-green);
  border-bottom-color: var(--s-green-line);
}

/* 步骤列表 */
.page-faq .faq-steps {
  list-style: none;
  counter-reset: faqstep;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 11px;
}

.page-faq .faq-steps > li {
  position: relative;
  padding-left: 44px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--c-body);
}

.page-faq .faq-steps > li::before {
  counter-increment: faqstep;
  content: counter(faqstep, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 2px;
  padding: 1px 7px;
  border: 1px solid var(--s-green-line);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--c-green);
}

/* 联系方式卡片 */
.page-faq .faq-contact {
  margin-top: 26px;
  padding: clamp(20px, 3vw, 32px);
  border: 1px solid var(--s-green-line);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(135deg, rgba(198, 255, 61, .07), rgba(77, 225, 255, .05) 70%, transparent);
}

.page-faq .faq-contact-title {
  margin: 0 0 16px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--c-white);
}

.page-faq .faq-contact-list {
  margin: 0;
  display: grid;
  gap: 12px;
}

.page-faq .faq-crow {
  display: grid;
  gap: 3px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--c-line);
}

.page-faq .faq-crow:last-child {
  padding-bottom: 0;
  border-bottom: none;
}

.page-faq .faq-ckey {
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--c-muted);
}

.page-faq .faq-cval {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 14.5px;
  font-weight: 700;
  word-break: break-word;
  color: var(--c-white);
}

.page-faq .faq-contact-note {
  margin: 18px 0 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--c-muted);
}

.page-faq .faq-contact-note a {
  color: var(--c-ice);
  text-decoration: none;
  border-bottom: 1px solid var(--s-ice-line);
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-faq .faq-contact-note a:hover {
  color: var(--c-green);
  border-bottom-color: var(--s-green-line);
}

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

  .page-faq .faq-a {
    padding-left: 48px;
    padding-right: 8px;
  }

  .page-faq .faq-lead {
    font-size: 17px;
  }

  .page-faq .faq-crow {
    grid-template-columns: 120px minmax(0, 1fr);
    align-items: baseline;
    gap: 16px;
  }
}

@media (min-width: 900px) {
  .page-faq .quick-item {
    grid-template-columns: 74px minmax(190px, 260px) minmax(0, 1fr);
    gap: 28px;
    align-items: start;
    padding: 26px 0;
  }

  .page-faq .quick-code {
    padding-top: 4px;
  }
}

/* ---------- 桌面：左侧固定索引 + 右侧窄栏问答 ---------- */
@media (min-width: 1024px) {
  .page-faq .faq-body {
    display: grid;
    grid-template-columns: var(--faq-rail-w) minmax(0, var(--faq-flow-w));
    column-gap: clamp(36px, 5vw, 76px);
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    margin-bottom: 0;
    padding: 0 0 0 18px;
    border-top: none;
    border-bottom: none;
    border-left: 1px solid var(--c-line);
  }

  .page-faq .faq-rail-list {
    display: grid;
    gap: 2px;
    overflow: visible;
  }

  .page-faq .faq-rail-title {
    margin-bottom: 14px;
  }

  .page-faq .faq-rail-link {
    border: none;
    border-bottom: 1px solid transparent;
    border-radius: 0;
    padding: 7px 0;
    background: none;
    font-size: 13.5px;
  }

  .page-faq .faq-rail-link:hover {
    background: none;
    border-bottom-color: var(--c-line-strong);
  }

  .page-faq .faq-rail-link[aria-current="true"] {
    background: none;
    border-bottom-color: var(--s-orange-line);
  }

  .page-faq .faq-section--fig-left,
  .page-faq .faq-section--fig-right {
    display: grid;
    column-gap: 32px;
    align-items: start;
  }

  .page-faq .faq-section--fig-left {
    grid-template-columns: 250px minmax(0, 1fr);
    grid-template-areas:
      "head head"
      "fig  body";
  }

  .page-faq .faq-section--fig-right {
    grid-template-columns: minmax(0, 1fr) 216px;
    grid-template-areas:
      "head head"
      "body fig";
  }

  .page-faq .faq-section--fig-left .faq-section-head,
  .page-faq .faq-section--fig-right .faq-section-head {
    grid-area: head;
  }

  .page-faq .faq-section--fig-left .faq-figure,
  .page-faq .faq-section--fig-right .faq-figure {
    grid-area: fig;
    margin: 0;
  }

  .page-faq .faq-section--fig-left .faq-items,
  .page-faq .faq-section--fig-right .faq-items {
    grid-area: body;
  }
}

@media (min-width: 1280px) {
  .page-faq .faq-section--fig-left {
    grid-template-columns: 280px minmax(0, 1fr);
  }

  .page-faq .faq-section--fig-right {
    grid-template-columns: minmax(0, 1fr) 244px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-q[open] .faq-a {
    animation: none;
  }

  .page-faq .faq-q-mark::before,
  .page-faq .faq-q-mark::after,
  .page-faq .faq-q-text,
  .page-faq .faq-rail-link,
  .page-faq .faq-a a,
  .page-faq .quick-text a {
    transition: none;
  }
}