.page-faq {
  --faq-bar: 3px;
  --faq-q-indent: 4px;
  background: var(--ink);
  color: var(--bone);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--pad-x) clamp(56px, 8vw, 104px);
  box-sizing: border-box;
  overflow-x: hidden;
}

.page-faq *,
.page-faq *::before,
.page-faq *::after {
  box-sizing: border-box;
}

.page-faq p {
  margin: 0 0 1.1em;
  max-width: 68ch;
}

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

.page-faq a {
  color: inherit;
}

.page-faq .breadcrumb {
  margin: clamp(20px, 3vw, 30px) 0 0;
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  padding: clamp(34px, 6vw, 72px) 0 clamp(40px, 6vw, 76px);
  border-bottom: var(--faq-bar) solid var(--moss);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: calc(-1 * var(--faq-bar));
  width: clamp(90px, 22vw, 260px);
  height: var(--faq-bar);
  background: var(--cyan);
}

.page-faq .faq-hero__lead h1 {
  margin: 0;
  font-family: var(--font-narrow);
  font-weight: 700;
  letter-spacing: -0.5px;
  font-size: clamp(32px, 6.4vw, 58px);
  line-height: 1.06;
  color: var(--bone);
}

.page-faq .faq-hero__lead .eyebrow {
  margin-bottom: 14px;
}

.page-faq .faq-hero__intro {
  font-size: clamp(15px, 1.6vw, 17px);
  color: var(--bone);
  opacity: .88;
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.page-faq .faq-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: 28px 0 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-faq .faq-hero__stats > div {
  background: var(--slate-deep);
  padding: 14px 12px;
}

.page-faq .faq-hero__stats dt {
  font-size: 11px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--rock);
  margin-bottom: 4px;
}

.page-faq .faq-hero__stats dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.page-faq .faq-hero__stats .data-num {
  font-size: clamp(24px, 4vw, 34px);
  line-height: 1;
  color: var(--cyan);
}

.page-faq .unit {
  font-size: 12px;
  color: var(--rock);
  letter-spacing: 1px;
}

@media (min-width: 900px) {
  .page-faq .faq-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }
  .page-faq .faq-hero__side {
    padding-left: clamp(20px, 3vw, 40px);
  }
}

/* ---------- 章节标题带 ---------- */

.page-faq .section-band {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 18px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-strong);
}

.page-faq .section-band .section-num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 1.5px;
  color: var(--cyan);
}

.page-faq .section-band h2 {
  margin: 0;
  font-family: var(--font-editorial);
  font-weight: 600;
  font-size: clamp(22px, 3.4vw, 34px);
  line-height: 1.25;
  color: var(--bone);
}

.page-faq .section-lead {
  color: var(--bone);
  opacity: .85;
}

.page-faq section {
  padding-top: clamp(48px, 7vw, 88px);
}

/* ---------- 三步路径 ---------- */

.page-faq .path-band {
  margin-top: clamp(24px, 4vw, 38px);
}

.page-faq .path-rail {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

@media (min-width: 720px) {
  .page-faq .path-rail {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
  }
  .page-faq .path-node + .path-node {
    border-left-width: 0;
  }
}

.page-faq .path-node {
  appearance: none;
  position: relative;
  display: grid;
  gap: 6px;
  width: 100%;
  padding: 18px 16px;
  text-align: left;
  background: var(--moss);
  color: var(--bone);
  border: 2px solid var(--line-strong);
  font: inherit;
  cursor: pointer;
  transition: background .25s var(--ease), border-color .25s var(--ease), transform .25s var(--ease);
}

.page-faq .path-node:hover {
  background: var(--slate-deep);
  border-color: var(--rock);
}

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

.page-faq .path-node[aria-pressed="true"] {
  background: var(--slate-deep);
  border-color: var(--cyan);
  transform: translate(-2px, -2px);
  box-shadow: 5px 5px 0 var(--clay);
}

.page-faq .path-node__num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 2px;
  color: var(--cyan);
}

.page-faq .path-node__name {
  font-family: var(--font-narrow);
  font-weight: 700;
  font-size: clamp(18px, 2.4vw, 22px);
  letter-spacing: -0.3px;
}

.page-faq .path-node__hint {
  font-size: 12px;
  letter-spacing: .4px;
  color: var(--rock);
}

.page-faq .path-panels {
  margin-top: 16px;
}

.page-faq .path-panel {
  padding: 20px 18px;
  margin-bottom: 12px;
  background: var(--slate-deep);
  border-left: var(--faq-q-indent) solid var(--cyan);
}

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

.page-faq .path-panel h3 {
  margin: 0 0 10px;
  font-family: var(--font-narrow);
  font-weight: 700;
  font-size: clamp(17px, 2.2vw, 21px);
  letter-spacing: -0.2px;
  color: var(--bone);
}

.page-faq .path-panel p {
  font-size: 15px;
  color: var(--bone);
  opacity: .88;
}

.page-faq .path-note {
  padding-top: 10px;
  border-top: 1px dashed var(--line);
  font-size: 13px;
  color: var(--rock);
  opacity: 1;
}

.page-faq .path-figure {
  margin: clamp(26px, 4vw, 42px) 0 0;
}

/* ---------- 媒体框 ---------- */

.page-faq .media-frame {
  position: relative;
  overflow: hidden;
  background: var(--coal);
  border: 2px solid var(--line-strong);
}

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

.page-faq .media-frame--wide img {
  aspect-ratio: 14 / 9;
}

.page-faq .figure-caption {
  padding: 12px 16px;
  font-size: 12px;
  letter-spacing: .6px;
  color: var(--rock);
  background: var(--coal);
  border-top: 1px solid var(--line);
}

/* ---------- 回看设置 ---------- */

.page-faq .replay-grid {
  display: grid;
  gap: clamp(22px, 3.5vw, 36px);
  margin-top: clamp(18px, 3vw, 28px);
}

@media (min-width: 880px) {
  .page-faq .replay-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }
}

.page-faq .replay-grid__text p {
  font-size: 15.5px;
  opacity: .9;
}

.page-faq .replay-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 2px solid var(--moss);
}

.page-faq .replay-list li {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr);
  gap: 12px;
  padding: 14px 2px;
  border-bottom: 1px solid var(--line);
}

.page-faq .replay-list__k {
  font-size: 12px;
  letter-spacing: 1.5px;
  color: var(--cyan);
  font-family: var(--font-mono);
}

.page-faq .replay-list__v {
  font-size: 14.5px;
  color: var(--bone);
  opacity: .85;
}

/* ---------- 分布口径 ---------- */

.page-faq .caliber-switch {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: clamp(18px, 3vw, 26px) 0 18px;
}

.page-faq .caliber-key {
  appearance: none;
  font: inherit;
  font-family: var(--font-narrow);
  font-weight: 700;
  letter-spacing: -0.2px;
  font-size: 15px;
  padding: 9px 20px;
  color: var(--bone);
  background: transparent;
  border: 2px solid var(--line-strong);
  cursor: pointer;
  transition: background .22s var(--ease), color .22s var(--ease), border-color .22s var(--ease);
}

.page-faq .caliber-key:hover {
  border-color: var(--cyan);
}

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

.page-faq .caliber-key[aria-pressed="true"] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink);
}

.page-faq .caliber-panels {
  display: grid;
  gap: 12px;
}

@media (min-width: 760px) {
  .page-faq .caliber-panels {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-faq .caliber-panel {
  background: var(--moss);
  border: 1px solid var(--line-strong);
  border-top: 3px solid var(--cyan);
  padding: 18px 16px;
}

.page-faq .caliber-panel h3 {
  margin: 0 0 8px;
  font-family: var(--font-narrow);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: -0.2px;
  color: var(--bone);
}

.page-faq .caliber-panel p {
  font-size: 14px;
  color: var(--bone);
  opacity: .82;
  margin: 0;
}

.page-faq .caliber-figure {
  margin: clamp(26px, 4vw, 40px) 0 0;
}

.page-faq .caliber-tip {
  margin-top: 18px;
  padding-left: 14px;
  border-left: 3px solid var(--orange);
  font-size: 14.5px;
  color: var(--bone);
  opacity: .88;
}

/* ---------- 索引查法 ---------- */

.page-faq .index-grid {
  display: grid;
  gap: clamp(22px, 3.5vw, 36px);
  margin-top: clamp(18px, 3vw, 28px);
}

@media (min-width: 880px) {
  .page-faq .index-grid {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    align-items: start;
  }
}

.page-faq .index-grid__main h3 {
  margin: 0 0 8px;
  font-family: var(--font-narrow);
  font-weight: 700;
  font-size: clamp(16px, 2.2vw, 20px);
  letter-spacing: -0.2px;
  color: var(--bone);
}

.page-faq .index-grid__main h3 + p {
  margin-bottom: 1.6em;
}

.page-faq .index-grid__main p {
  font-size: 15px;
  opacity: .88;
}

.page-faq .index-grid__side {
  background: var(--coal);
  border: 2px solid var(--moss);
  padding: 20px 18px;
}

.page-faq .index-grid__side-title {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--rock);
}

.page-faq .id-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding: 12px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-faq .id-row .mono {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: .5px;
  color: var(--cyan);
  word-break: break-all;
}

.page-faq .copy-btn {
  appearance: none;
  font: inherit;
  font-size: 12px;
  letter-spacing: 1px;
  padding: 7px 14px;
  color: var(--bone);
  background: transparent;
  border: 1px solid var(--line-strong);
  cursor: pointer;
  transition: background .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease);
}

.page-faq .copy-btn:hover {
  border-color: var(--cyan);
  color: var(--cyan);
}

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

.page-faq .copy-btn[data-copied] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink);
}

.page-faq .index-grid__side-note {
  margin-top: 14px;
  font-size: 13px;
  color: var(--rock);
  line-height: 1.7;
}

/* ---------- 纠错反馈 ---------- */

.page-faq .fix-grid {
  display: grid;
  gap: clamp(22px, 3.5vw, 36px);
  margin-top: clamp(18px, 3vw, 28px);
}

@media (min-width: 880px) {
  .page-faq .fix-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }
}

.page-faq .fix-grid__body p {
  font-size: 15.5px;
  opacity: .9;
}

.page-faq .fix-steps {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-faq .fix-steps li {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 12px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  font-size: 15px;
  color: var(--bone);
  opacity: .9;
}

.page-faq .fix-steps__num {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--clay);
  padding-top: 3px;
}

.page-faq .fix-copy {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin-top: 22px;
  padding: 14px 16px;
  background: var(--slate-deep);
  border-left: var(--faq-q-indent) solid var(--cyan);
}

.page-faq .fix-copy__label {
  font-size: 12px;
  letter-spacing: 1.5px;
  color: var(--rock);
}

.page-faq .fix-grid__side {
  background: var(--coal);
  border: 2px solid var(--moss);
  padding: 22px 18px;
}

.page-faq .fix-side__title {
  margin: 0 0 16px;
  font-size: 11px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--rock);
}

.page-faq .fix-side__num {
  margin: 0 0 4px;
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.page-faq .fix-side__num .data-num {
  font-size: clamp(30px, 5vw, 44px);
  line-height: 1;
  color: var(--cyan);
}

.page-faq .fix-side__text {
  font-size: 14px;
  color: var(--bone);
  opacity: .82;
  margin: 0 0 20px;
}

.page-faq .fix-side__text--muted {
  margin-bottom: 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  color: var(--rock);
  opacity: 1;
  font-size: 13px;
}

/* ---------- 常见疑问 ---------- */

.page-faq .qa-list {
  margin-top: clamp(18px, 3vw, 28px);
  border-top: 2px solid var(--moss);
}

.page-faq .qa-item {
  border-bottom: 1px solid var(--line);
  border-left: var(--faq-q-indent) solid transparent;
  transition: border-color .22s var(--ease), background .22s var(--ease);
}

.page-faq .qa-item[open] {
  border-left-color: var(--cyan);
  background: rgba(30, 58, 50, .38);
}

.page-faq .qa-item summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 18px 12px;
}

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

.page-faq .qa-item summary::after {
  content: "+";
  flex: 0 0 auto;
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--rock);
  padding-top: 4px;
}

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

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

.page-faq .qa-item__q {
  font-family: var(--font-narrow);
  font-weight: 700;
  font-size: clamp(16px, 2.2vw, 19px);
  line-height: 1.45;
  letter-spacing: -0.2px;
  color: var(--bone);
}

.page-faq .qa-item__a {
  padding: 0 12px 20px 30px;
}

.page-faq .qa-item__a p {
  font-size: 14.5px;
  color: var(--bone);
  opacity: .85;
  margin: 0;
}

.page-faq .qa-foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px;
  margin-top: clamp(28px, 4vw, 44px);
  padding: 20px 0 0;
  border-top: var(--faq-bar) solid var(--moss);
}

.page-faq .qa-foot p {
  margin: 0;
  font-size: 14.5px;
  color: var(--rock);
  flex: 1 1 260px;
}

@media (max-width: 560px) {
  .page-faq .faq-hero__stats {
    grid-template-columns: 1fr;
  }
  .page-faq .qa-item__a {
    padding-left: 12px;
  }
  .page-faq .replay-list li {
    grid-template-columns: 1fr;
    gap: 4px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .path-node,
  .page-faq .caliber-key,
  .page-faq .qa-item,
  .page-faq .copy-btn {
    transition: none;
  }
  .page-faq .path-node[aria-pressed="true"] {
    transform: none;
  }
}