/* ===== 使用规范页（/usage/） ===== */

.page-disclaimer {
  background: var(--paper);
  color: var(--t-ink);
  padding-bottom: clamp(56px, 10vw, 112px);
}

/* ---------- 首屏：暗底 + 斜切出口 ---------- */

.page-disclaimer .usage-hero {
  position: relative;
  background: var(--ink);
  color: var(--t-fog);
  padding: calc(var(--hdr-h) + clamp(30px, 6vw, 58px)) 0 clamp(84px, 13vw, 140px);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - clamp(26px, 5vw, 52px)), 0 100%);
  overflow: hidden;
}

.page-disclaimer .usage-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(227, 237, 240, .05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(227, 237, 240, .05) 1px, transparent 1px);
  background-size: 76px 76px;
  pointer-events: none;
}

.page-disclaimer .usage-hero .wrap {
  position: relative;
  z-index: 1;
}

.page-disclaimer .usage-hero .crumbs {
  margin-bottom: clamp(22px, 4vw, 40px);
}

.page-disclaimer .usage-hero .crumbs__link {
  color: var(--t-mute);
  text-decoration: none;
}

.page-disclaimer .usage-hero .crumbs__link:hover {
  color: var(--lime);
}

.page-disclaimer .usage-hero .crumbs__sep {
  color: var(--t-faint);
}

.page-disclaimer .usage-hero .crumbs__item[aria-current="page"] {
  color: var(--t-fog);
}

.page-disclaimer .usage-hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 5vw, 44px);
  align-items: center;
}

.page-disclaimer .usage-hero .eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 16px;
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--lime);
}

.page-disclaimer .usage-hero .eyebrow::before {
  content: "";
  width: 24px;
  height: 2px;
  background: var(--lime);
  flex: none;
}

.page-disclaimer .usage-hero .title-1 {
  margin: 0 0 20px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(34px, 7.4vw, 68px);
  line-height: 1.05;
  letter-spacing: -.01em;
  color: var(--t-fog);
}

.page-disclaimer .usage-hero .lede {
  margin: 0;
  max-width: 46ch;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.75;
  color: var(--t-mute);
}

.page-disclaimer .usage-hero__figure {
  margin: 0;
}

.page-disclaimer .usage-hero__figure .figure__frame {
  position: relative;
  border: 1px solid rgba(227, 237, 240, .18);
  border-radius: var(--r);
  background: var(--ink-2);
  overflow: hidden;
}

.page-disclaimer .usage-hero__figure .figure__frame::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 52px;
  height: 3px;
  background: var(--lime);
}

.page-disclaimer .usage-hero__figure .figure__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(.72) contrast(1.04) brightness(.96);
}

/* ---------- 主体：单栏条文 + 右侧索引 ---------- */

.page-disclaimer .usage-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  align-items: start;
}

.page-disclaimer .usage-doc {
  min-width: 0;
  padding-top: clamp(26px, 5vw, 52px);
}

.page-disclaimer .usage-sec {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  column-gap: 14px;
  padding: clamp(28px, 5vw, 42px) 0;
  border-top: 1px solid var(--sand-line);
  scroll-margin-top: calc(var(--hdr-h) + 24px);
}

.page-disclaimer .usage-sec:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-disclaimer .usage-sec:last-child {
  border-bottom: 1px solid var(--sand-line);
}

.page-disclaimer .usage-sec__num {
  font-family: var(--font-num);
  font-weight: 600;
  font-size: clamp(24px, 3.4vw, 36px);
  line-height: 1;
  letter-spacing: .02em;
  color: var(--teal);
  padding-top: 2px;
}

.page-disclaimer .usage-sec__main {
  min-width: 0;
}

.page-disclaimer .usage-sec__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 14px;
}

.page-disclaimer .usage-sec__title {
  flex: 1 1 auto;
  min-width: 0;
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(21px, 3vw, 28px);
  line-height: 1.15;
  letter-spacing: -.01em;
  color: var(--t-ink);
}

.page-disclaimer .usage-sec__anchor {
  flex: none;
  font-family: var(--font-num);
  font-size: 15px;
  line-height: 1;
  color: var(--sand-line);
  text-decoration: none;
  opacity: .55;
  transition: opacity var(--step-s) var(--ease), color var(--step-s) var(--ease);
}

.page-disclaimer .usage-sec__anchor:hover,
.page-disclaimer .usage-sec__anchor:focus-visible {
  opacity: 1;
  color: var(--teal);
}

.page-disclaimer .usage-sec__body p {
  margin: 0 0 16px;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--t-mute-ink);
}

.page-disclaimer .usage-sec__body p:last-child {
  margin-bottom: 0;
}

.page-disclaimer .usage-list {
  list-style: none;
  margin: 0;
  padding: 0;
  max-width: 62ch;
}

.page-disclaimer .usage-list li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 12px;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--t-mute-ink);
}

.page-disclaimer .usage-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .82em;
  width: 11px;
  height: 1px;
  background: var(--sand-line);
}

.page-disclaimer .usage-list li:last-child {
  margin-bottom: 0;
}

.page-disclaimer .usage-doc a {
  color: var(--teal);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-decoration-color: var(--sand-line);
  text-underline-offset: 3px;
  transition: text-decoration-color var(--step-s) var(--ease);
}

.page-disclaimer .usage-doc a:hover {
  text-decoration-color: var(--teal);
}

.page-disclaimer .usage-doc ::selection {
  background: var(--teal-mist);
  color: var(--t-ink);
}

/* ---------- 右侧极简锚点目录（桌面端） ---------- */

.page-disclaimer .usage-toc {
  display: none;
}

.page-disclaimer .usage-toc__label {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--t-mute-ink);
}

.page-disclaimer .usage-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-disclaimer .usage-toc__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 7px 0;
  font-size: 14px;
  line-height: 1.45;
  color: var(--t-mute-ink);
  text-decoration: none;
  transition: color var(--step-s) var(--ease);
}

.page-disclaimer .usage-toc__num {
  flex: none;
  min-width: 18px;
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: .02em;
  color: var(--sand-line);
}

.page-disclaimer .usage-toc__link:hover {
  color: var(--teal);
}

.page-disclaimer .usage-toc__link[aria-current="true"] {
  color: var(--t-ink);
  font-weight: 600;
}

.page-disclaimer .usage-toc__link[aria-current="true"] .usage-toc__num {
  color: var(--teal);
}

/* ---------- 响应式 ---------- */

@media (min-width: 700px) {
  .page-disclaimer .usage-hero__inner {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    gap: clamp(30px, 5vw, 56px);
  }
}

@media (min-width: 1024px) {
  .page-disclaimer .usage-layout {
    grid-template-columns: minmax(0, 1fr) 208px;
    column-gap: clamp(40px, 6vw, 88px);
  }

  .page-disclaimer .usage-doc {
    padding-top: clamp(34px, 4vw, 60px);
  }

  .page-disclaimer .usage-sec {
    grid-template-columns: 64px minmax(0, 1fr);
    column-gap: 24px;
  }

  .page-disclaimer .usage-toc {
    display: block;
    position: sticky;
    top: calc(var(--hdr-h) + 32px);
    margin-top: clamp(34px, 4vw, 60px);
    padding-left: 18px;
    border-left: 1px solid var(--sand-line);
  }
}

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