.page-disclaimer {
  --u-line: rgba(143, 179, 167, 0.22);
  --u-line-soft: rgba(143, 179, 167, 0.12);
  --u-gap: clamp(52px, 8vw, 112px);
  background: var(--ink);
  color: var(--paper);
  overflow-x: hidden;
}

/* 刊头 */
.page-disclaimer .usage-masthead {
  display: grid;
  gap: clamp(26px, 5vw, 40px);
  padding-block: clamp(24px, 4vw, 44px) clamp(28px, 5vw, 52px);
}

.page-disclaimer .usage-masthead .eyebrow {
  color: var(--cyan);
  font-family: var(--ff-mono);
}

.page-disclaimer .usage-masthead .display-title {
  margin: 14px 0 0;
  font-family: var(--ff-display);
  font-size: clamp(2rem, 5vw, 3.6rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--white);
  max-width: 16ch;
}

.page-disclaimer .usage-masthead .lead {
  margin: 18px 0 0;
  max-width: 44em;
  font-family: var(--ff-body);
  font-size: clamp(0.98rem, 1.6vw, 1.06rem);
  line-height: 1.8;
  color: var(--mist);
}

/* 三行摘要卡 */
.page-disclaimer .usage-brief {
  background: var(--ink-2);
  border: 1px solid var(--u-line-soft);
  border-left: 3px solid var(--cyan);
  border-radius: var(--radius);
  padding: 20px 20px 10px;
}

.page-disclaimer .usage-brief__title {
  margin: 0 0 4px;
  font-family: var(--ff-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.2em;
  color: var(--mist);
  text-transform: uppercase;
}

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

.page-disclaimer .usage-brief__list li {
  display: grid;
  grid-template-columns: 2rem minmax(0, 1fr);
  gap: 12px;
  padding: 14px 0;
  border-top: 1px solid var(--u-line-soft);
  font-family: var(--ff-body);
  font-size: 0.93rem;
  line-height: 1.7;
  color: var(--paper);
}

.page-disclaimer .usage-brief__list li:first-child {
  border-top: 0;
  padding-top: 6px;
}

.page-disclaimer .usage-brief__no {
  font-family: var(--ff-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--gold);
  padding-top: 4px;
}

/* 横幅 */
.page-disclaimer .usage-banner {
  margin: 0;
  border: 1px solid var(--u-line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-2);
}

.page-disclaimer .usage-banner img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

.page-disclaimer .usage-banner__cap {
  padding: 12px 16px;
  border-top: 1px solid var(--u-line);
  font-family: var(--ff-body);
  font-size: 12px;
  letter-spacing: 0.04em;
  line-height: 1.7;
  color: var(--mist);
}

/* 章节目录 */
.page-disclaimer .usage-index {
  margin-top: clamp(26px, 4vw, 40px);
  border-top: 1px solid var(--u-line);
  border-bottom: 1px solid var(--u-line);
}

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

.page-disclaimer .usage-index a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 2px;
  border-bottom: 1px solid var(--u-line-soft);
  font-family: var(--ff-body);
  font-size: 0.9rem;
  color: var(--mist);
  text-decoration: none;
  transition: color 160ms var(--ease), padding-left 160ms var(--ease);
}

.page-disclaimer .usage-index li:last-child a {
  border-bottom: 0;
}

.page-disclaimer .usage-index a:hover,
.page-disclaimer .usage-index a:focus-visible {
  color: var(--cyan);
  padding-left: 6px;
}

.page-disclaimer .usage-index .num {
  font-family: var(--ff-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--gold);
}

/* 章节骨架 */
.page-disclaimer .usage-sec {
  padding-block: var(--u-gap);
}

.page-disclaimer .usage-sec__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  gap: 14px;
  padding-top: 16px;
  margin-bottom: clamp(24px, 3.5vw, 36px);
  border-top: 1px solid var(--u-line);
}

.page-disclaimer .usage-sec__no {
  margin: 0;
  font-family: var(--ff-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-disclaimer .usage-sec__title {
  margin: 0;
  font-family: var(--ff-display);
  font-size: clamp(1.5rem, 3.6vw, 2.4rem);
  font-weight: 700;
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--white);
}

/* 纸白翻页区 */
.page-disclaimer .usage-sec--paper {
  --u-line: rgba(18, 32, 28, 0.18);
  --u-line-soft: rgba(18, 32, 28, 0.1);
  background: var(--paper);
  color: var(--paper-ink);
}

.page-disclaimer .usage-sec--paper .usage-sec__title {
  color: var(--paper-ink);
}

.page-disclaimer .usage-sec--paper .usage-sec__no {
  color: var(--teal);
}

/* 错位分栏 */
.page-disclaimer .usage-grid {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

/* 正文 */
.page-disclaimer .usage-text > p {
  margin: 0 0 1.1em;
  max-width: 44em;
  font-family: var(--ff-body);
  font-size: 1rem;
  line-height: 1.82;
  color: var(--paper);
}

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

.page-disclaimer .usage-sec--paper .usage-text > p {
  color: var(--paper-ink);
}

.page-disclaimer .usage-text a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-disclaimer .usage-sec--paper .usage-text a {
  color: var(--teal);
}

/* 规则示例 */
.page-disclaimer .usage-text > p.usage-example {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  margin-top: 1.5em;
  padding: 14px 16px;
  background: var(--ink-2);
  border-left: 2px solid var(--gold);
  border-radius: var(--radius);
  font-size: 0.9rem;
  line-height: 1.72;
  color: var(--mist);
}

.page-disclaimer .usage-example__tag {
  font-family: var(--ff-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  line-height: 1.6;
  color: var(--gold);
  border: 1px solid var(--line-gold);
  border-radius: 2px;
  padding: 1px 6px;
}

/* 引用格式块 */
.page-disclaimer .usage-cite {
  margin: 1.5em 0;
  padding: 20px;
  background: var(--ink);
  border: 1px solid var(--line-cyan);
  border-radius: var(--radius);
}

.page-disclaimer .usage-cite__label {
  margin: 0 0 12px;
  font-family: var(--ff-mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  color: var(--cyan);
}

.page-disclaimer .usage-cite__code,
.page-disclaimer .usage-cite__sample {
  margin: 0;
  font-family: var(--ff-mono);
  font-size: 0.84rem;
  line-height: 1.9;
  word-break: break-word;
}

.page-disclaimer .usage-cite__code {
  color: var(--paper);
}

.page-disclaimer .usage-cite__sample {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed rgba(143, 179, 167, 0.26);
  color: var(--gold);
}

/* 侧栏小卡 */
.page-disclaimer .usage-note {
  padding: 18px 20px;
  background: var(--ink-2);
  border: 1px solid var(--u-line-soft);
  border-top: 1px solid var(--line-cyan);
  border-radius: var(--radius);
}

.page-disclaimer .usage-note--paper {
  background: rgba(18, 32, 28, 0.05);
  border: 1px solid var(--u-line);
  border-top: 1px solid var(--teal);
}

.page-disclaimer .usage-note__label {
  margin: 0 0 10px;
  font-family: var(--ff-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-disclaimer .usage-note--paper .usage-note__label {
  color: var(--teal);
}

.page-disclaimer .usage-note__text {
  margin: 0;
  font-family: var(--ff-body);
  font-size: 0.9rem;
  line-height: 1.78;
  color: var(--mist);
}

.page-disclaimer .usage-note--paper .usage-note__text {
  color: rgba(18, 32, 28, 0.78);
}

.page-disclaimer .usage-note__link {
  display: inline-block;
  margin-top: 14px;
  font-family: var(--ff-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-cyan);
  padding-bottom: 2px;
}

.page-disclaimer .usage-note__link:hover,
.page-disclaimer .usage-note__link:focus-visible {
  color: var(--white);
  border-bottom-color: var(--white);
}

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

.page-disclaimer .usage-note__list li {
  padding: 10px 0;
  border-top: 1px solid var(--u-line-soft);
  font-family: var(--ff-body);
  font-size: 0.88rem;
  line-height: 1.7;
  color: rgba(18, 32, 28, 0.8);
}

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

/* 三条来源 */
.page-disclaimer .usage-source {
  list-style: none;
  margin: clamp(24px, 3.5vw, 34px) 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--u-line-soft);
  border: 1px solid var(--u-line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-disclaimer .usage-source li {
  display: grid;
  grid-template-columns: 1.8rem minmax(0, 1fr);
  gap: 2px 12px;
  align-items: baseline;
  padding: 16px 18px;
  background: var(--ink-2);
}

.page-disclaimer .usage-source__no {
  grid-row: 1 / span 2;
  font-family: var(--ff-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-disclaimer .usage-source__name {
  grid-column: 2;
  font-family: var(--ff-display);
  font-size: 1.06rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--white);
}

.page-disclaimer .usage-source__desc {
  grid-column: 2;
  font-family: var(--ff-body);
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--mist);
}

/* 反馈步骤 */
.page-disclaimer .usage-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--u-line);
}

.page-disclaimer .usage-steps li {
  display: grid;
  grid-template-columns: 4.2rem minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 13px 0;
  border-bottom: 1px solid var(--u-line-soft);
  font-family: var(--ff-body);
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--paper);
}

.page-disclaimer .usage-steps__no {
  font-family: var(--ff-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  color: var(--gold);
}

/* 折叠问答 */
.page-disclaimer .usage-faq {
  margin-top: clamp(28px, 4vw, 44px);
  border-top: 1px solid var(--u-line);
}

.page-disclaimer .usage-fold {
  border-bottom: 1px solid var(--u-line-soft);
}

.page-disclaimer .usage-fold summary {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--ff-body);
  font-size: 0.96rem;
  font-weight: 500;
  line-height: 1.6;
  color: var(--paper);
  transition: color 160ms var(--ease);
}

.page-disclaimer .usage-fold summary::-webkit-details-marker {
  display: none;
}

.page-disclaimer .usage-fold summary::after {
  content: "+";
  flex: none;
  font-family: var(--ff-mono);
  font-size: 14px;
  color: var(--cyan);
}

.page-disclaimer .usage-fold[open] summary::after {
  content: "−";
}

.page-disclaimer .usage-fold summary:hover,
.page-disclaimer .usage-fold summary:focus-visible {
  color: var(--cyan);
}

.page-disclaimer .usage-fold__body {
  padding: 0 0 18px;
  max-width: 46em;
}

.page-disclaimer .usage-fold__body p {
  margin: 0;
  font-family: var(--ff-body);
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--mist);
}

/* 尾部反馈条 */
.page-disclaimer .usage-cta {
  position: relative;
  margin-bottom: clamp(48px, 8vw, 96px);
  padding: clamp(24px, 4vw, 40px);
  background: var(--ink-2);
  border: 1px solid var(--u-line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-disclaimer .usage-cta::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 10px;
  background: repeating-linear-gradient(90deg, var(--line-cyan) 0 1px, transparent 1px 14px);
  transform: skewY(-1.4deg);
  transform-origin: left top;
  pointer-events: none;
}

.page-disclaimer .usage-cta__kicker {
  margin: 6px 0 10px;
  font-family: var(--ff-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--gold);
}

.page-disclaimer .usage-cta__title {
  margin: 0 0 12px;
  font-family: var(--ff-display);
  font-size: clamp(1.3rem, 3vw, 1.9rem);
  font-weight: 700;
  line-height: 1.2;
  color: var(--white);
}

.page-disclaimer .usage-cta__text {
  margin: 0;
  max-width: 42em;
  font-family: var(--ff-body);
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--mist);
  word-break: break-word;
}

.page-disclaimer .usage-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

/* 桌面增强 */
@media (min-width: 820px) {
  .page-disclaimer .usage-index ol {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-disclaimer .usage-index a {
    border-bottom: 0;
    border-left: 1px solid var(--u-line-soft);
    padding: 16px 20px;
  }

  .page-disclaimer .usage-index li:first-child a {
    border-left: 0;
    padding-left: 2px;
  }

  .page-disclaimer .usage-source {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-disclaimer .usage-masthead {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: end;
    gap: clamp(32px, 5vw, 80px);
  }

  .page-disclaimer .usage-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(32px, 5vw, 72px);
    align-items: start;
  }

  .page-disclaimer .usage-cta {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    grid-template-areas:
      "kicker actions"
      "title actions"
      "text actions";
    align-items: center;
    column-gap: clamp(24px, 4vw, 56px);
  }

  .page-disclaimer .usage-cta__kicker {
    grid-area: kicker;
    margin-top: 0;
  }

  .page-disclaimer .usage-cta__title {
    grid-area: title;
  }

  .page-disclaimer .usage-cta__text {
    grid-area: text;
  }

  .page-disclaimer .usage-cta__actions {
    grid-area: actions;
    margin-top: 0;
    flex-direction: column;
    align-items: stretch;
  }
}

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