.page-disclaimer {
  --usage-text: #D9D5CF;
  --usage-measure: 640px;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.9;
  -webkit-font-smoothing: antialiased;
}

.page-disclaimer a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 94, 26, 0.55);
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-disclaimer a:hover,
.page-disclaimer a:focus-visible {
  color: var(--ember);
  border-bottom-color: var(--ember);
}

.page-disclaimer a:focus-visible {
  outline: 2px solid var(--lava);
  outline-offset: 3px;
}

.page-disclaimer .crumbs {
  padding: 22px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--fog);
  border-bottom: 0;
}

.page-disclaimer .crumbs a {
  border-bottom: 1px solid transparent;
}

.page-disclaimer .crumbs-sep {
  margin: 0 8px;
  color: var(--steel);
}

/* ---------- 首屏 ---------- */

.usage-head {
  border-top: 4px solid var(--lava);
  margin-top: 18px;
  padding: 26px 0 0;
  background: linear-gradient(180deg, rgba(255, 94, 26, 0.08), rgba(10, 10, 10, 0) 260px);
}

.usage-scale {
  height: 10px;
  margin-bottom: 22px;
  border-bottom: 1px solid var(--steel);
  background-image: repeating-linear-gradient(90deg, var(--steel) 0 1px, transparent 1px 22px);
  background-size: 22px 6px;
  background-repeat: repeat-x;
  background-position: left bottom;
}

.page-disclaimer .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--lava);
}

.usage-head h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(30px, 8vw, 76px);
  font-weight: 700;
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.usage-lead {
  max-width: var(--usage-measure);
  margin: 20px 0 0;
  font-size: 15.5px;
  line-height: 1.95;
  color: var(--fog);
}

.usage-figure {
  margin-top: 30px;
}

.page-disclaimer .media-frame {
  border: 1px solid var(--steel);
  background: var(--graphite);
  overflow: hidden;
}

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

.page-disclaimer .media-caption {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.7;
  letter-spacing: 0.04em;
  color: var(--fog-dim);
}

/* ---------- 吸顶条款索引 ---------- */

.usage-index {
  position: sticky;
  top: var(--bar);
  z-index: 6;
  margin-top: 34px;
  background: var(--ink);
  border-top: 1px solid var(--steel);
  border-bottom: 1px solid var(--steel);
}

.usage-index-inner {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-top: 10px;
  padding-bottom: 10px;
  overflow-x: auto;
  scrollbar-width: none;
}

.usage-index-inner::-webkit-scrollbar {
  display: none;
}

.usage-index-label {
  flex: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--fog-dim);
}

.usage-index-list {
  display: flex;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.usage-index-list a {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 5px 10px;
  border: 1px solid var(--steel);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--fog);
  white-space: nowrap;
  transition: border-color 160ms var(--ease), color 160ms var(--ease), background-color 160ms var(--ease);
}

.usage-index-list a:hover,
.usage-index-list a:focus-visible {
  border-color: var(--lava);
  border-bottom-color: var(--lava);
  background: rgba(255, 94, 26, 0.1);
  color: var(--paper);
}

.usage-index-list .mono {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--lava);
}

/* ---------- 条款 ---------- */

.usage-body {
  padding-top: 4px;
}

.clause {
  display: grid;
  gap: 12px;
  padding: 38px 0;
  border-top: 1px solid var(--steel);
}

.usage-body .clause:first-child {
  border-top: 0;
  padding-top: 34px;
}

.clause-num {
  display: flex;
  align-items: flex-start;
}

.clause-anchor {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1;
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--lava);
  border-bottom: 0;
  padding-bottom: 4px;
  border-bottom: 1px solid transparent;
}

.clause-anchor:hover,
.clause-anchor:focus-visible {
  color: var(--amber);
  border-bottom-color: var(--amber);
}

.clause-body h2 {
  display: flex;
  flex-direction: column;
  gap: 7px;
  margin: 0 0 14px;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 21px;
  line-height: 1.45;
  letter-spacing: 0;
  color: var(--paper);
}

.clause-tag {
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 400;
  letter-spacing: 0.22em;
  color: var(--fog-dim);
}

.clause-body p {
  max-width: var(--usage-measure);
  margin: 0 0 16px;
  font-size: 15.5px;
  line-height: 1.95;
  color: var(--usage-text);
}

.clause-body p:last-child {
  margin-bottom: 0;
}

.clause-body .callout {
  position: relative;
  max-width: var(--usage-measure);
  margin: 22px 0;
  padding: 14px 18px 14px 20px;
  border-left: 2px solid var(--lava);
  background: var(--graphite);
  color: var(--paper);
  font-size: 15px;
  line-height: 1.85;
}

.clause-list {
  display: grid;
  gap: 9px;
  max-width: var(--usage-measure);
  margin: 0 0 18px;
  padding: 0;
  list-style: none;
}

.clause-list li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--usage-text);
}

.clause-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.95em;
  width: 10px;
  height: 1px;
  background: var(--lava);
}

.clause-list .mono-key {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--paper);
}

/* ---------- 末段与回顶 ---------- */

.usage-links {
  margin-top: 30px;
  padding-top: 22px;
  border-top: 1px solid var(--steel);
}

.usage-links-head {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.2em;
  color: var(--fog-dim);
}

.usage-links-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.usage-links-list a {
  font-size: 15px;
  color: var(--paper);
}

.usage-foot {
  padding: 40px 0 64px;
}

.usage-foot-rule {
  height: 1px;
  background: var(--steel);
}

.usage-foot-top {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px 24px;
  padding-top: 18px;
}

.usage-version {
  max-width: 520px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.8;
  letter-spacing: 0.02em;
  color: var(--fog-dim);
}

.usage-back {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--lava);
  border-bottom: 0;
  white-space: nowrap;
}

.usage-back:hover,
.usage-back:focus-visible {
  color: var(--amber);
  border-bottom-color: transparent;
}

/* ---------- 桌面 ---------- */

@media (min-width: 860px) {
  .page-disclaimer {
    font-size: 17px;
  }

  .clause {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 36px;
    padding: 62px 0;
  }

  .usage-body .clause:first-child {
    padding-top: 48px;
  }

  .clause-num {
    position: sticky;
    top: calc(var(--bar) + 74px);
    align-self: start;
  }

  .clause-anchor {
    font-size: 34px;
  }

  .clause-body h2 {
    font-size: 26px;
    margin-bottom: 18px;
  }

  .clause-body p,
  .usage-lead {
    font-size: 16.5px;
  }

  .clause-body .callout {
    padding: 16px 22px 16px 24px;
    font-size: 15.5px;
  }

  .usage-head {
    padding-top: 40px;
  }

  .usage-lead {
    max-width: 660px;
  }

  .usage-foot {
    padding-bottom: 88px;
  }
}

@media (min-width: 1200px) {
  .usage-head h1 {
    max-width: 15ch;
  }

  .clause {
    grid-template-columns: 120px minmax(0, 1fr);
    gap: 48px;
  }

  .clause-body h2 {
    font-size: 28px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-disclaimer a,
  .usage-index-list a {
    transition: none;
  }
}
<<<END>>>