.page-faq {
  --faq-narrow: 34em;
  --faq-aside-w: 268px;
}

/* 面包屑抬升 */
.page-faq .crumbs {
  padding-top: 18px;
}

/* 首屏 */
.page-faq .faq-hero {
  padding: 24px 0 6px;
}

.page-faq .faq-hero__inner {
  display: grid;
  gap: var(--gap);
  align-items: start;
}

.page-faq .faq-hero__lead h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 6.4vw, 62px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--paper);
  margin: 14px 0 0;
  max-width: 20em;
}

.page-faq .faq-hero__intro {
  margin: 20px 0 0;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.75;
  max-width: var(--faq-narrow);
}

.page-faq .faq-hero__facts {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-hero__facts li {
  background: var(--ink);
  padding: 12px 2px;
  font-size: 14px;
  color: var(--muted);
  line-height: 1.6;
}

.page-faq .faq-hero__facts .num {
  color: var(--yellow);
  font-family: var(--font-mono);
  font-size: 20px;
  margin-right: 8px;
}

.page-faq .faq-hero__side {
  border: 1px solid var(--line);
  border-left: 3px solid var(--red);
  background: var(--ink-2);
  padding: 20px;
}

.page-faq .faq-hero__side-label {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-faq .faq-hero__steps {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-faq .faq-hero__steps li {
  font-size: 14px;
  line-height: 1.6;
  color: var(--paper);
  display: flex;
  gap: 10px;
}

.page-faq .faq-hero__steps .num {
  font-family: var(--font-mono);
  color: var(--muted);
  flex: none;
}

/* 横向索引带 */
.page-faq .faq-index {
  position: sticky;
  top: 0;
  z-index: 5;
  background: var(--ink-2);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  margin-top: 34px;
}

.page-faq .faq-index__inner {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-top: 10px;
  padding-bottom: 10px;
}

.page-faq .faq-index__label {
  flex: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-faq .faq-index__list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 4px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-faq .faq-index__list li {
  flex: none;
}

.page-faq .faq-index__list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  font-size: 13px;
  color: var(--muted);
  text-decoration: none;
  border: 1px solid transparent;
  white-space: nowrap;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

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

.page-faq .faq-index__list .num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--cyan);
}

/* 主体 */
.page-faq .faq-body {
  padding-top: 40px;
}

.page-faq .faq-body__inner {
  display: grid;
  gap: var(--gap);
  align-items: start;
}

.page-faq .faq-main {
  display: grid;
  gap: 48px;
  min-width: 0;
}

/* 分组 */
.page-faq .faq-group {
  scroll-margin-top: 72px;
}

.page-faq .faq-group__head {
  display: flex;
  gap: 14px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-group__no {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--cyan);
  border: 1px solid var(--line);
  padding: 3px 7px;
  height: fit-content;
  flex: none;
}

.page-faq .faq-group__head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(20px, 3.2vw, 28px);
  line-height: 1.25;
  color: var(--paper);
}

.page-faq .faq-group__head p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
  max-width: var(--faq-narrow);
}

.page-faq .faq-group__cols {
  display: grid;
  gap: var(--gap);
  margin-top: 20px;
}

.page-faq .faq-group__list {
  display: grid;
  gap: 10px;
  align-content: start;
  min-width: 0;
}

.page-faq .faq-group__figure {
  margin: 0;
  border: 1px solid var(--line);
}

.page-faq .faq-group__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.85);
}

/* 问答条目 */
.page-faq .faq-item {
  border: 1px solid var(--line);
  background: var(--ink-2);
  transition: border-color var(--t-fast) var(--ease);
}

.page-faq .faq-item:hover {
  border-color: #2a4653;
}

.page-faq .faq-item [aria-expanded="true"] {
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-item .expand__head {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 16px 16px;
  background: none;
  border: 0;
  text-align: left;
  cursor: pointer;
  font: inherit;
  color: var(--paper);
}

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

.page-faq .faq-item__q {
  font-size: 15px;
  font-weight: 600;
  line-height: 1.55;
}

.page-faq .faq-item .expand__sign {
  flex: none;
  width: 14px;
  height: 14px;
  position: relative;
}

.page-faq .faq-item .expand__sign::before,
.page-faq .faq-item .expand__sign::after {
  content: "";
  position: absolute;
  background: var(--cyan);
  transition: transform var(--t-mid) var(--ease), opacity var(--t-fast) var(--ease);
}

.page-faq .faq-item .expand__sign::before {
  left: 0;
  top: 6px;
  width: 14px;
  height: 2px;
}

.page-faq .faq-item .expand__sign::after {
  left: 6px;
  top: 0;
  width: 2px;
  height: 14px;
}

.page-faq .faq-item [aria-expanded="true"] .expand__sign::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-faq .faq-item .expand__panel {
  overflow: hidden;
  transition: height var(--t-mid) var(--ease);
}

.page-faq .faq-item .expand__body {
  padding: 4px 16px 18px;
  font-size: 15px;
  line-height: 1.78;
  color: #d5e0dd;
  max-width: 44em;
}

.page-faq .faq-item .expand__body p {
  margin: 0 0 12px;
}

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

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

.page-faq .num--yellow {
  color: var(--yellow);
}

.page-faq .faq-note {
  font-size: 13px;
  color: var(--muted);
  border-left: 2px solid var(--line);
  padding-left: 12px;
}

.page-faq .faq-note--warn {
  border-left-color: var(--red);
  color: #e6c9ce;
}

.page-faq .faq-link {
  font-size: 13px;
  color: var(--muted);
}

/* 设备对比 */
.page-faq .device-switch {
  margin-top: 20px;
  border: 1px solid var(--line);
  background: var(--ink-2);
  padding: 18px;
}

.page-faq .device-switch__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.page-faq .device-switch .chip {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  padding: 7px 14px;
  background: none;
  border: 1px solid var(--line);
  color: var(--muted);
  cursor: pointer;
  transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}

.page-faq .device-switch .chip:hover {
  color: var(--paper);
}

.page-faq .device-switch .chip[aria-pressed="true"],
.page-faq .device-switch .chip.is-active {
  background: var(--paper);
  color: var(--ink);
  border-color: var(--paper);
}

.page-faq .device-panel {
  display: grid;
  gap: 18px;
  align-items: center;
}

.page-faq .device-panel[hidden] {
  display: none;
}

.page-faq .device-panel__figure {
  color: var(--cyan);
  border: 1px solid var(--line);
  padding: 10px;
  background: var(--ink);
}

.page-faq .device-panel__figure svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-faq .device-panel__text h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  color: var(--paper);
}

.page-faq .device-panel__text p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: #d5e0dd;
  max-width: 40em;
}

/* 联系组 */
.page-faq .faq-help {
  margin-top: 22px;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-faq .faq-help__block {
  background: var(--ink-2);
  padding: 18px;
}

.page-faq .faq-help__label {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-faq .faq-help__value {
  margin: 0 0 8px;
  font-size: 17px;
  color: var(--paper);
  word-break: break-all;
}

.page-faq .faq-help__value .num {
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}

.page-faq .faq-help__value a {
  color: var(--paper);
  text-decoration: none;
  border-bottom: 2px solid var(--red);
  padding-bottom: 2px;
}

.page-faq .faq-help__value a:hover {
  color: var(--cyan);
}

.page-faq .faq-help__meta {
  margin: 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--muted);
}

.page-faq .faq-help__foot {
  margin: 22px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

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

/* 侧栏 */
.page-faq .faq-aside {
  border: 1px solid var(--line);
  background: var(--ink-2);
  padding: 20px;
}

.page-faq .faq-aside__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--yellow);
}

.page-faq .faq-aside__list {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-faq .faq-aside__list li {
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
  border-top: 1px solid var(--line);
  padding-top: 12px;
}

.page-faq .faq-aside__list li:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-faq .faq-aside__list strong {
  display: block;
  color: var(--paper);
  font-weight: 600;
  margin-bottom: 4px;
}

/* 尾段 */
.page-faq .faq-tail {
  border-top: 1px solid var(--line);
}

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

.page-faq .faq-tail h2 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(20px, 3.4vw, 30px);
  color: var(--paper);
  line-height: 1.25;
}

.page-faq .faq-tail__links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-faq .faq-tail__links li {
  border-top: 1px solid var(--line);
}

.page-faq .faq-tail__links a {
  display: block;
  padding: 14px 0;
  color: var(--paper);
  text-decoration: none;
  font-size: 15px;
  line-height: 1.6;
  transition: color var(--t-fast) var(--ease), padding-left var(--t-fast) var(--ease);
}

.page-faq .faq-tail__links a:hover,
.page-faq .faq-tail__links a:focus-visible {
  color: var(--cyan);
  padding-left: 8px;
}

/* 平板：变更说明固定第 2 栏 + 内容两列 */
@media (min-width: 720px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1fr) 300px;
  }

  .page-faq .faq-hero__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1px;
  }

  .page-faq .faq-hero__facts li {
    padding: 14px 12px;
  }

  .page-faq .faq-body__inner {
    grid-template-columns: minmax(0, 1fr) var(--faq-aside-w);
  }

  .page-faq .faq-aside {
    position: sticky;
    top: 72px;
  }

  .page-faq .faq-group__cols {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  }

  .page-faq .faq-group__cols--reverse {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.35fr);
  }

  .page-faq .faq-group__cols--reverse .faq-group__figure {
    order: -1;
  }

  .page-faq .device-panel {
    grid-template-columns: 260px minmax(0, 1fr);
  }

  .page-faq .faq-help {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-faq .faq-tail__inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr);
    align-items: start;
    gap: 32px;
  }
}

/* 桌面 */
@media (min-width: 1080px) {
  .page-faq .faq-hero {
    padding-top: 40px;
  }

  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1fr) 340px;
    gap: 40px;
  }

  .page-faq .faq-body__inner {
    gap: 36px;
  }

  .page-faq .faq-main {
    gap: 60px;
  }

  .page-faq .faq-group__cols {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    gap: 28px;
  }

  .page-faq .faq-group__cols--reverse {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.5fr);
  }

  .page-faq .device-panel {
    grid-template-columns: 320px minmax(0, 1fr);
    gap: 26px;
  }
}