.page-disclaimer {
  --u-gap: clamp(18px, 3vw, 32px);
  --u-cut: 20px;
  --u-soft: rgba(243, 247, 242, 0.74);
  padding-bottom: clamp(40px, 7vw, 88px);
}

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

.page-disclaimer .breadcrumb {
  margin-block: clamp(16px, 3vw, 28px) clamp(18px, 4vw, 36px);
}

/* 首屏 */
.usage-hero {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

.usage-hero__main h1 {
  margin: 0.3em 0 0.55em;
  font-size: clamp(32px, 7.4vw, 62px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  font-weight: 900;
  max-width: 16em;
}

.usage-hero__lede {
  margin: 0 0 clamp(20px, 3vw, 30px);
  font-size: 15px;
  line-height: 1.85;
  color: var(--u-soft);
  max-width: 34em;
}

.usage-hero__side {
  display: grid;
  gap: 14px;
  align-content: start;
  border-top: 1px solid var(--line);
  padding-top: 18px;
}

.usage-hero__note {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--moss);
}

.usage-toc__title {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--moss);
}

.usage-toc {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
}

.usage-toc a {
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
  color: var(--chalk);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.16s ease;
}

.usage-toc a .mono {
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--moss);
}

.usage-toc a:hover,
.usage-toc a:focus-visible {
  color: var(--lime);
}

/* 时间轴 */
.usage-track {
  margin-top: clamp(32px, 6vw, 64px);
  padding: clamp(20px, 3.5vw, 34px);
  background: var(--pitch-900);
  clip-path: polygon(0 0, calc(100% - var(--u-cut)) 0, 100% var(--u-cut), 100% 100%, 0 100%);
}

.usage-track__head h2 {
  margin: 0.1em 0 0.35em;
  font-size: clamp(20px, 3.2vw, 28px);
  line-height: 1.25;
  letter-spacing: -0.01em;
}

.usage-track__head p {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--moss);
}

.usage-track__canvas {
  margin-top: clamp(6px, 2vw, 16px);
}

.usage-track__canvas svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-disclaimer .track-label {
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: 20px;
  letter-spacing: -0.01em;
  fill: var(--chalk);
}

.page-disclaimer .track-sub {
  font-family: var(--font-sans);
  font-size: 15px;
  fill: var(--moss);
}

.page-disclaimer .track-time {
  font-family: var(--font-mono);
  font-size: 19px;
  fill: var(--amber);
}

.usage-track__note {
  margin: clamp(10px, 2vw, 18px) 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.7;
  color: var(--u-soft);
}

/* 图片 */
.usage-figure {
  margin: clamp(28px, 5vw, 52px) 0 0;
}

.page-disclaimer .figure__caption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--moss);
}

/* 刷新节奏 */
.usage-timing {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
}

.usage-timing__main h2 {
  margin: 0.15em 0 0.5em;
  font-size: clamp(24px, 4.6vw, 40px);
  line-height: 1.18;
  letter-spacing: -0.02em;
  max-width: 14em;
}

.usage-timing__lede {
  margin: 0 0 clamp(20px, 3vw, 30px);
  font-size: 15px;
  line-height: 1.85;
  color: var(--u-soft);
  max-width: 34em;
}

.usage-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
}

.usage-step {
  position: relative;
  padding: 0 0 clamp(20px, 3vw, 28px) clamp(20px, 3vw, 26px);
  border-left: 1px solid var(--line);
}

.usage-step:last-child {
  padding-bottom: 0;
}

.usage-step::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 7px;
  width: 7px;
  height: 7px;
  background: var(--moss);
}

.usage-step--live::before {
  background: var(--amber);
}

.usage-step__title {
  margin: 0 0 6px;
  font-size: 16px;
  letter-spacing: 0.01em;
}

.usage-step p {
  margin: 0;
  max-width: 36em;
  font-size: 14px;
  line-height: 1.8;
  color: var(--u-soft);
}

.usage-note {
  padding: clamp(20px, 3vw, 28px);
  color: var(--ink-paper);
}

.usage-note__title {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.22em;
  font-weight: 700;
  opacity: 0.6;
}

.usage-note p {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.8;
}

.usage-note p:last-child {
  margin-bottom: 0;
}

/* 分段切换 */
.usage-switch-wrap h2 {
  margin: 0.15em 0 0;
  font-size: clamp(24px, 4.4vw, 40px);
  line-height: 1.18;
  letter-spacing: -0.02em;
}

.usage-switch {
  margin-top: clamp(18px, 3vw, 28px);
}

.usage-switch .tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(16px, 3vw, 34px);
  border-bottom: 1px solid var(--line-strong);
}

.usage-switch .tabs__tab {
  appearance: none;
  background: none;
  border: 0;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  padding: 10px 0;
  color: var(--moss);
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 800;
  letter-spacing: -0.01em;
  cursor: pointer;
  transition: color 0.16s ease, border-color 0.16s ease;
}

.usage-switch .tabs__tab[aria-selected="true"] {
  color: var(--chalk);
  border-bottom-color: var(--lime);
}

.usage-switch .tabs__panel {
  padding-top: clamp(20px, 3vw, 32px);
  animation: u-fade 0.2s ease-out both;
}

@keyframes u-fade {
  from { opacity: 0; }
  to { opacity: 1; }
}

.usage-device p {
  margin: 0 0 12px;
  max-width: 36em;
  font-size: 14px;
  line-height: 1.85;
  color: var(--u-soft);
}

.usage-device a,
.usage-feedback__main a {
  color: var(--lime);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.usage-table {
  width: 100%;
  border-collapse: collapse;
  margin: clamp(10px, 2vw, 18px) 0 clamp(16px, 3vw, 24px);
  font-size: 14px;
}

.usage-table caption {
  padding-bottom: 10px;
  text-align: left;
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--moss);
}

.usage-table th,
.usage-table td {
  padding: 12px 10px 12px 0;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
  line-height: 1.6;
}

.usage-table th {
  width: 44%;
  font-weight: 600;
  color: var(--moss);
}

.usage-table td {
  color: var(--chalk);
}

.usage-table td.mono {
  font-family: var(--font-mono);
  letter-spacing: 0.01em;
}

/* 内容引用面板 */
.usage-rules {
  padding: clamp(22px, 3.4vw, 34px);
  color: var(--ink-paper);
}

.usage-rules h3 {
  margin: 0 0 14px;
  font-size: clamp(17px, 2.6vw, 20px);
  letter-spacing: -0.01em;
  color: var(--ink-paper);
}

.usage-rules ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.usage-rules li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.8;
}

.usage-rules li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 6px;
  background: var(--ink-paper);
  opacity: 0.45;
}

.usage-rules strong {
  font-weight: 800;
}

.usage-rules__foot {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid rgba(20, 33, 28, 0.2);
  font-size: 13px;
  line-height: 1.7;
}

.usage-rules a {
  color: var(--ink-paper);
  text-decoration: underline;
  text-underline-offset: 3px;
  font-weight: 700;
}

/* 反馈 */
.usage-feedback {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
}

.usage-feedback__main h2 {
  margin: 0.15em 0 0.5em;
  font-size: clamp(24px, 4.4vw, 38px);
  line-height: 1.18;
  letter-spacing: -0.02em;
  max-width: 15em;
}

.usage-feedback__main > p {
  margin: 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--u-soft);
}

.usage-feedback__list {
  counter-reset: fb;
  list-style: none;
  margin: clamp(16px, 3vw, 24px) 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.usage-feedback__list li {
  display: grid;
  grid-template-columns: 2.4em minmax(0, 1fr);
  gap: 8px;
  align-items: baseline;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.7;
  color: var(--chalk);
}

.usage-feedback__list li::before {
  content: counter(fb, decimal-leading-zero);
  counter-increment: fb;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--lime);
}

.usage-contact {
  padding: clamp(22px, 3.4vw, 32px);
  background: var(--pitch-900);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--u-cut)), calc(100% - var(--u-cut)) 100%, 0 100%);
}

.usage-contact__label {
  margin: clamp(14px, 2vw, 18px) 0 4px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--moss);
}

.usage-contact__label:first-child {
  margin-top: 0;
}

.usage-contact__value {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--chalk);
  overflow-wrap: anywhere;
}

.usage-contact__value.mono {
  font-family: var(--font-mono);
  font-size: 13px;
}

.usage-contact__hint {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  line-height: 1.7;
  color: var(--u-soft);
}

.usage-contact .cluster {
  margin-top: 18px;
}

/* 宽屏 */
@media (min-width: 900px) {
  .usage-hero {
    grid-template-columns: minmax(0, 1.55fr) minmax(220px, 0.62fr);
    align-items: start;
  }

  .usage-hero__side {
    grid-template-columns: auto minmax(0, 1fr);
    grid-template-rows: auto 1fr;
    column-gap: 18px;
    border-top: 0;
    border-left: 1px solid var(--line);
    padding: 6px 0 0 clamp(16px, 2.4vw, 30px);
  }

  .usage-hero__note {
    grid-row: 1 / span 2;
    writing-mode: vertical-rl;
    letter-spacing: 0.3em;
  }

  .usage-toc__title,
  .usage-toc {
    grid-column: 2;
  }

  .usage-timing {
    grid-template-columns: minmax(0, 1.5fr) minmax(240px, 0.72fr);
    align-items: start;
  }

  .usage-feedback {
    grid-template-columns: minmax(0, 1.45fr) minmax(250px, 0.75fr);
    align-items: start;
  }

  .usage-table th {
    width: 38%;
  }
}

/* 窄屏 */
@media (max-width: 700px) {
  .page-disclaimer .track-sub {
    display: none;
  }

  .page-disclaimer .track-label {
    font-size: 42px;
  }

  .page-disclaimer .track-time {
    font-size: 34px;
  }

  .usage-track {
    padding: 16px 14px;
  }

  .usage-table th {
    width: 46%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .usage-switch .tabs__panel {
    animation: none;
  }

  .usage-toc a,
  .usage-switch .tabs__tab {
    transition: none;
  }
}
<<<END>>>