.page-faq {
  --faq-line: var(--line);
  --faq-gap: 26px;
}

.page-faq .faq-shell {
  padding-block: 22px 78px;
}

/* 面包屑后的首屏 */
.page-faq .faq-hero {
  border-top: 2px solid var(--faq-line);
  padding-top: 20px;
  margin-bottom: 30px;
}

.page-faq .faq-hero h1 {
  font-size: clamp(2.05rem, 7vw, 3.7rem);
  line-height: 1.04;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--head);
  margin: 14px 0 16px;
  max-width: 22ch;
}

.page-faq .faq-hero .lede {
  max-width: 56ch;
  color: var(--text);
  font-size: 1.0625rem;
  line-height: 1.75;
  margin: 0;
}

.page-faq .faq-facts {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-faq .faq-fact {
  border: 2px solid var(--faq-line);
  background: var(--panel-2);
  padding: 13px 14px;
}

.page-faq .faq-fact-num {
  display: block;
  font-family: var(--mono);
  font-size: 1.65rem;
  line-height: 1.05;
  color: var(--cyan);
  letter-spacing: -0.01em;
}

.page-faq .faq-fact:nth-child(2) .faq-fact-num {
  color: var(--orange);
}

.page-faq .faq-fact-unit {
  font-size: 0.9rem;
  margin-left: 2px;
  color: var(--clay);
}

.page-faq .faq-fact-label {
  display: block;
  margin-top: 6px;
  font-size: 0.8125rem;
  color: var(--mid);
  letter-spacing: 0.04em;
}

/* 顶部分类索引带 */
.page-faq .faq-index {
  border-top: 2px solid var(--faq-line);
  border-bottom: 2px solid var(--faq-line);
  margin-bottom: 34px;
  background: var(--panel-2);
}

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

.page-faq .faq-index-link {
  display: block;
  white-space: nowrap;
  padding: 13px 16px;
  font-size: 0.875rem;
  color: var(--text);
  text-decoration: none;
  border-right: 1px solid var(--faq-line);
  transition: color 180ms ease-out, background-color 180ms ease-out, box-shadow 180ms ease-out;
}

.page-faq .faq-index-link:hover {
  color: var(--head);
  background: var(--ink);
  box-shadow: inset 0 -3px 0 var(--cyan);
}

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

/* 主体：内容列 + 提示栏 */
.page-faq .faq-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 36px;
}

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

/* 问答区块 */
.page-faq .faq-block {
  border-top: 2px solid var(--faq-line);
  padding-top: 24px;
  margin-bottom: 48px;
  scroll-margin-top: 20px;
}

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

.page-faq .faq-block-head h2 {
  font-size: clamp(1.5rem, 5vw, 2.1rem);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--head);
  margin: 8px 0 10px;
}

.page-faq .faq-block-lede {
  max-width: 58ch;
  margin: 0;
  color: var(--text);
  line-height: 1.75;
}

/* 案例切换 */
.page-faq .case-tabs {
  margin-top: 22px;
}

.page-faq .case-tabs .tab-list {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 12px;
  scrollbar-width: thin;
}

.page-faq .case-tabs .tab {
  flex: 0 0 auto;
  border: 2px solid var(--faq-line);
  background: var(--panel-2);
  color: var(--text);
  font: inherit;
  font-size: 0.875rem;
  line-height: 1.2;
  padding: 10px 14px;
  cursor: pointer;
  white-space: nowrap;
  transition: color 180ms ease-out, border-color 180ms ease-out, box-shadow 180ms ease-out;
}

.page-faq .case-tabs .tab:hover {
  color: var(--head);
  border-color: var(--mid);
}

.page-faq .case-tabs .tab[aria-selected="true"] {
  color: var(--head);
  border-color: var(--cyan);
  background: var(--ink);
  box-shadow: inset 0 -3px 0 var(--cyan);
}

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

.page-faq .case-tabs .tab-panel {
  border-top: 2px solid var(--faq-line);
  padding-top: 20px;
  display: grid;
  gap: 14px;
}

.page-faq .case-tabs .tab-panel[hidden] {
  display: none;
}

.page-faq .case-item {
  border: 2px solid var(--faq-line);
  background: var(--panel);
  padding: 16px 18px;
  transition: transform 200ms ease-out, border-color 200ms ease-out;
}

.page-faq .case-item:hover {
  transform: translateY(-2px);
  border-color: var(--cyan);
}

.page-faq .case-item-tag {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--cyan);
  margin: 0 0 8px;
}

.page-faq .case-item h3 {
  font-size: 1.0625rem;
  line-height: 1.4;
  color: var(--head);
  margin: 0 0 8px;
  font-weight: 600;
}

.page-faq .case-item p {
  margin: 0;
  color: var(--text);
  font-size: 0.9375rem;
  line-height: 1.75;
}

/* 折叠问答 */
.page-faq .qa-list {
  margin-top: 20px;
  display: grid;
  gap: 12px;
}

.page-faq .qa {
  border: 2px solid var(--faq-line);
  background: var(--panel);
  transition: border-color 200ms ease-out, box-shadow 200ms ease-out;
}

.page-faq .qa[open] {
  border-color: var(--mid);
  box-shadow: var(--shadow);
}

.page-faq .qa summary {
  cursor: pointer;
  list-style: none;
  position: relative;
  padding: 15px 48px 15px 18px;
  color: var(--head);
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.55;
}

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

.page-faq .qa summary::after {
  content: "+";
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--mono);
  font-size: 1.25rem;
  line-height: 1;
  color: var(--cyan);
}

.page-faq .qa[open] summary::after {
  content: "−";
  color: var(--orange);
}

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

.page-faq .qa-body {
  border-left: 3px solid var(--cyan);
  margin: 0 18px 18px;
  padding: 2px 0 2px 15px;
  color: var(--text);
  font-size: 0.9688rem;
  line-height: 1.78;
}

.page-faq .qa-body p {
  margin: 0 0 10px;
}

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

/* 步骤 */
.page-faq .faq-steps {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-faq .faq-steps li {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 14px;
  border: 2px solid var(--faq-line);
  background: var(--panel-2);
  padding: 16px;
}

.page-faq .step-num {
  font-family: var(--mono);
  font-size: 1.15rem;
  line-height: 1.3;
  color: var(--orange);
}

.page-faq .faq-steps h3 {
  margin: 0 0 6px;
  font-size: 1rem;
  color: var(--head);
  font-weight: 600;
}

.page-faq .faq-steps p {
  margin: 0;
  color: var(--text);
  font-size: 0.9375rem;
  line-height: 1.75;
}

/* 数据表与图 */
.page-faq .faq-table {
  margin-top: 22px;
}

.page-faq .faq-table caption {
  caption-side: top;
  text-align: left;
  padding-bottom: 10px;
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  color: var(--mid);
}

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

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.04);
}

.page-faq .media-caption {
  margin-top: 10px;
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--mid);
}

/* 侧栏提示 */
.page-faq .faq-side {
  display: grid;
  gap: 16px;
  align-content: start;
}

.page-faq .side-card {
  border: 2px solid var(--faq-line);
  background: var(--panel-2);
  padding: 18px;
}

.page-faq .side-title {
  margin: 0 0 14px;
  font-size: 0.9375rem;
  letter-spacing: 0.06em;
  color: var(--head);
  font-weight: 700;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .side-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-faq .side-list li {
  display: grid;
  gap: 3px;
}

.page-faq .side-key {
  font-size: 0.8125rem;
  color: var(--mid);
}

.page-faq .side-val {
  font-size: 0.9375rem;
  color: var(--head);
  word-break: break-word;
}

.page-faq .side-note {
  margin: 14px 0 0;
  padding-left: 12px;
  border-left: 3px solid var(--clay);
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--text);
}

.page-faq .side-card .btn {
  margin-top: 16px;
  display: inline-block;
}

.page-faq .side-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-faq .side-links a {
  color: var(--text);
  text-decoration: none;
  font-size: 0.9375rem;
  border-bottom: 1px solid var(--faq-line);
  padding-bottom: 8px;
  display: block;
  transition: color 180ms ease-out, border-color 180ms ease-out;
}

.page-faq .side-links a:hover {
  color: var(--cyan);
  border-color: var(--cyan);
}

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

/* 平板与桌面 */
@media (min-width: 700px) {
  .page-faq .faq-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-faq .case-tabs .tab-panel {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-shell {
    padding-block: 34px 96px;
  }

  .page-faq .faq-body {
    grid-template-columns: minmax(0, 1fr) 292px;
    gap: 48px;
    align-items: start;
  }

  .page-faq .faq-side {
    position: sticky;
    top: 26px;
  }

  .page-faq .faq-hero h1 {
    max-width: 26ch;
  }
}