.page-disclaimer {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  padding-bottom: clamp(32px, 5vw, 64px);
}

.page-disclaimer .usage-crumb {
  padding-top: clamp(14px, 2.4vw, 22px);
  font-size: 13px;
}

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

.page-disclaimer a:hover {
  color: var(--signal);
}

/* 首屏 */
.page-disclaimer .usage-hero {
  margin-top: 12px;
  padding: clamp(24px, 4.4vw, 48px) 0 clamp(22px, 3.6vw, 40px);
  background: linear-gradient(158deg, var(--mist) 0%, var(--paper) 58%, var(--paper) 100%);
  border-bottom: 1px solid var(--line-soft);
}

.page-disclaimer .usage-hero-inner {
  display: grid;
  gap: 26px;
}

.page-disclaimer .usage-hero-main h1 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 5.4vw, 50px);
  line-height: 1.16;
  letter-spacing: -0.025em;
}

.page-disclaimer .usage-lead {
  margin: 16px 0 0;
  max-width: 40em;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.72;
}

.page-disclaimer .usage-facts {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  font-size: 13px;
  color: var(--slate);
}

.page-disclaimer .usage-facts li {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  border-bottom: 1px solid var(--line-soft);
  padding-bottom: 3px;
}

.page-disclaimer .usage-facts .mono {
  color: var(--blue);
  font-weight: 700;
  font-size: 14px;
}

.page-disclaimer .mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.page-disclaimer .usage-version {
  background: var(--blue);
  color: #fff;
  border-top: 5px solid var(--signal);
  border-radius: var(--r-lg);
  padding: 22px 22px 24px;
}

.page-disclaimer .uv-label {
  display: block;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--yellow);
  text-transform: uppercase;
}

.page-disclaimer .uv-num {
  display: block;
  margin-top: 4px;
  font-size: clamp(44px, 9vw, 66px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.04em;
}

.page-disclaimer .uv-text {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.65;
  color: rgba(255, 255, 255, 0.86);
}

.page-disclaimer .uv-meta {
  margin: 16px 0 0;
  padding: 14px 0 0;
  border-top: 1px solid var(--on-blue-line);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.page-disclaimer .uv-meta dt {
  font-size: 11px;
  letter-spacing: 0.08em;
  color: rgba(255, 255, 255, 0.66);
}

.page-disclaimer .uv-meta dd {
  margin: 2px 0 0;
  font-size: 14px;
  font-weight: 700;
}

.page-disclaimer .usage-version .btn {
  margin-top: 18px;
  width: 100%;
  justify-content: center;
}

/* 三栏骨架在一栏内呈现：索引 + 正文 */
.page-disclaimer .usage-shell {
  display: grid;
  gap: 24px;
  padding-top: clamp(24px, 4vw, 44px);
}

.page-disclaimer .usage-index {
  border-top: 3px solid var(--signal);
  padding-top: 14px;
}

.page-disclaimer .index-title {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--slate);
}

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

.page-disclaimer .index-link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 6px 10px;
  border-radius: var(--r-sm);
  font-size: 14px;
  color: var(--ink);
  text-decoration: none;
  background: rgba(255, 255, 255, 0.6);
  border: 1px solid var(--line-soft);
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-disclaimer .index-link .mono {
  font-size: 11px;
  color: var(--signal);
  font-weight: 700;
}

.page-disclaimer .index-link:hover,
.page-disclaimer .index-link:focus-visible {
  background: var(--mist);
  border-color: var(--blue-mid);
  color: var(--blue);
}

/* 条款 */
.page-disclaimer .clause {
  padding: clamp(22px, 3.2vw, 34px) 0;
  border-bottom: 1px solid var(--line);
}

.page-disclaimer .clause:first-child {
  padding-top: 0;
}

.page-disclaimer .clause:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-disclaimer .clause-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 12px;
}

.page-disclaimer .clause-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--signal);
  flex: none;
}

.page-disclaimer .clause h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(20px, 2.7vw, 27px);
  letter-spacing: -0.02em;
  line-height: 1.28;
}

.page-disclaimer .clause p {
  margin: 0 0 12px;
  max-width: 42em;
  font-size: 16px;
  line-height: 1.75;
}

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

.page-disclaimer .key-list {
  list-style: none;
  margin: 14px 0 16px;
  padding: 0;
  display: grid;
  gap: 11px;
}

.page-disclaimer .key-list li {
  position: relative;
  padding-left: 18px;
  max-width: 42em;
  font-size: 15.5px;
  line-height: 1.72;
}

.page-disclaimer .key-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 7px;
  height: 7px;
  background: var(--signal);
  border-radius: 1px;
}

.page-disclaimer .key-list strong {
  color: var(--blue);
  font-weight: 700;
}

/* 提示条 */
.page-disclaimer .note-blue,
.page-disclaimer .note-yellow {
  margin: 18px 0 0;
  padding: 14px 16px;
  border-radius: 0 var(--r-md) var(--r-md) 0;
  display: grid;
  gap: 8px;
}

.page-disclaimer .note-blue {
  background: var(--mist);
  border-left: 4px solid var(--blue);
}

.page-disclaimer .note-yellow {
  background: var(--yellow-mist);
  border-left: 4px solid var(--yellow);
}

.page-disclaimer .note-tag {
  font-size: 11px;
  letter-spacing: 0.14em;
  font-weight: 700;
  color: var(--blue);
}

.page-disclaimer .note-blue p,
.page-disclaimer .note-yellow p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  max-width: 44em;
}

/* 版本图 */
.page-disclaimer .version-visual {
  margin: 18px 0 18px;
  padding: 0;
}

.page-disclaimer .version-visual img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--r-lg);
  border: 1px solid var(--line-soft);
  background: var(--mist);
  object-fit: cover;
}

.page-disclaimer .version-visual figcaption {
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--slate);
}

/* 展开补充 */
.page-disclaimer .clause-more {
  margin-top: 16px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: #fff;
  overflow: hidden;
}

.page-disclaimer .clause-more summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 16px;
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
}

.page-disclaimer .clause-more summary::-webkit-details-marker {
  display: none;
}

.page-disclaimer .clause-more summary::after {
  content: "展开";
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--blue-mid);
  flex: none;
  transition: color var(--dur) var(--ease);
}

.page-disclaimer .clause-more[open] summary::after {
  content: "收起";
  color: var(--signal);
}

.page-disclaimer .clause-more summary:hover {
  background: var(--orange-mist);
}

.page-disclaimer .clause-more p {
  margin: 0;
  padding: 0 16px 15px;
  font-size: 15px;
  line-height: 1.72;
  color: var(--slate);
  max-width: 44em;
}

/* 联系条 */
.page-disclaimer .usage-contact {
  margin-top: 20px;
  background: var(--blue);
  color: #fff;
  border-radius: var(--r-lg);
  padding: clamp(20px, 3.4vw, 32px);
  display: grid;
  gap: 18px;
  border-bottom: 5px solid var(--signal);
}

.page-disclaimer .uc-title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 19px;
  line-height: 1.35;
}

.page-disclaimer .uc-desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: rgba(255, 255, 255, 0.88);
  max-width: 40em;
}

.page-disclaimer .uc-meta {
  margin: 12px 0 0;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--yellow);
}

.page-disclaimer .uc-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-disclaimer .uc-actions .btn {
  flex: 1 1 190px;
  justify-content: center;
}

.page-disclaimer .uc-actions .btn--ghost {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.6);
}

.page-disclaimer .uc-actions .btn--ghost:hover {
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
}

.page-disclaimer .usage-related {
  margin: 16px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--slate);
}

/* 平板及以上 */
@media (min-width: 720px) {
  .page-disclaimer .usage-hero-inner {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    align-items: start;
    gap: 32px;
  }

  .page-disclaimer .usage-contact {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 24px;
  }

  .page-disclaimer .uc-actions {
    flex-direction: column;
    flex-wrap: nowrap;
  }
}

/* 桌面：索引固定成侧栏 */
@media (min-width: 980px) {
  .page-disclaimer .usage-shell {
    grid-template-columns: 188px minmax(0, 1fr);
    gap: 52px;
  }

  .page-disclaimer .usage-index {
    position: sticky;
    top: calc(var(--header-h) + 20px);
  }

  .page-disclaimer .usage-index ol {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 3px;
  }

  .page-disclaimer .index-link {
    width: 100%;
    border-color: transparent;
    background: transparent;
    padding: 7px 10px;
  }

  .page-disclaimer .index-link:hover,
  .page-disclaimer .index-link:focus-visible {
    border-color: var(--blue-mid);
  }

  .page-disclaimer .version-visual {
    margin: 22px 0 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-disclaimer .index-link,
  .page-disclaimer .clause-more summary::after {
    transition: none;
  }
}