.page-disclaimer {
  --pd-grid: 72px;
  position: relative;
  padding-block: clamp(24px, 5vw, 56px) clamp(48px, 8vw, 96px);
  color: var(--ice);
  font-family: var(--font-body);
  background-color: var(--ink-900);
  background-image:
    radial-gradient(56% 58% at 14% 0%, rgba(73, 242, 208, .10), transparent 68%),
    linear-gradient(to right, rgba(36, 68, 60, .22) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(36, 68, 60, .22) 1px, transparent 1px);
  background-size: auto, var(--pd-grid) var(--pd-grid), var(--pd-grid) var(--pd-grid);
  background-position: center top, center top, center top;
}

.page-disclaimer > * {
  position: relative;
  z-index: 1;
}

/* 面包屑 */
.page-disclaimer .breadcrumb {
  margin-bottom: clamp(20px, 4vw, 36px);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .08em;
}

.page-disclaimer .breadcrumb a {
  color: var(--cool);
  text-decoration: none;
  transition: color .2s var(--ease);
}

.page-disclaimer .breadcrumb a:hover,
.page-disclaimer .breadcrumb a:focus-visible {
  color: var(--cyan);
}

.page-disclaimer .breadcrumb [aria-current="page"] {
  color: var(--sand);
}

/* 首屏 */
.usage-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 40px);
  padding-bottom: clamp(24px, 4vw, 44px);
}

.usage-hero__title {
  margin: .16em 0 .42em;
  font-family: var(--font-display);
  font-size: clamp(36px, 9vw, 76px);
  font-weight: 800;
  line-height: .98;
  letter-spacing: .01em;
  color: var(--ice);
}

.usage-hero__lede {
  max-width: 58ch;
  color: var(--ice-soft);
}

.usage-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 32px);
}

/* 版本面板 */
.usage-plate {
  position: relative;
  padding: clamp(20px, 3vw, 28px);
  border: 1px solid var(--line-strong);
  background: linear-gradient(160deg, rgba(11, 42, 33, .94), rgba(6, 26, 20, .88));
  box-shadow: inset 0 1px 0 rgba(73, 242, 208, .12);
}

.usage-plate::before,
.usage-plate::after {
  content: "";
  position: absolute;
  width: 14px;
  height: 14px;
  border: 1px solid var(--cyan);
  pointer-events: none;
}

.usage-plate::before {
  top: -1px;
  left: -1px;
  border-right: 0;
  border-bottom: 0;
}

.usage-plate::after {
  right: -1px;
  bottom: -1px;
  border-top: 0;
  border-left: 0;
}

.usage-seal {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 20px;
  padding: 10px 16px;
  border: 1px solid rgba(201, 168, 106, .55);
  background: rgba(201, 168, 106, .06);
  transform: rotate(-1.5deg);
}

.usage-seal__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--sand);
}

.usage-seal__code {
  font-family: var(--font-mono);
  font-size: var(--fs-20);
  font-weight: 600;
  letter-spacing: .06em;
  color: var(--ice);
}

.usage-plate__list {
  display: grid;
  gap: 14px;
  margin: 0;
}

.usage-plate__list > div {
  display: grid;
  gap: 4px;
}

.usage-plate__list dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--sand);
}

.usage-plate__list dd {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.6;
  color: var(--ice-soft);
  overflow-wrap: anywhere;
}

/* 首屏主图 */
.usage-banner {
  margin-block: clamp(8px, 2vw, 16px) clamp(36px, 6vw, 72px);
}

.page-disclaimer .usage-banner img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

/* 手册主体 */
.usage-manual {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 52px);
}

.usage-toc__title {
  margin: 0 0 14px;
}

.usage-toc__list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 4px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.usage-toc__list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 10px 9px 12px;
  border-left: 2px solid rgba(36, 68, 60, .9);
  color: var(--cool);
  font-size: var(--fs-14);
  line-height: 1.4;
  text-decoration: none;
  transition: color .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease);
}

.usage-toc__list a:hover,
.usage-toc__list a:focus-visible {
  color: var(--ice);
  border-color: var(--cyan);
  background: rgba(73, 242, 208, .06);
}

.usage-toc__num {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  color: var(--sand);
}

.usage-toc__top {
  margin-top: 18px;
}

/* 条款 */
.usage-clauses {
  display: grid;
  gap: clamp(28px, 5vw, 52px);
}

.clause {
  padding-top: clamp(20px, 3vw, 32px);
  border-top: 1px solid var(--line-soft);
  scroll-margin-top: 96px;
}

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

.clause__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  margin-bottom: 12px;
}

.clause__num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 4vw, 40px);
  line-height: 1;
  color: var(--cyan);
}

.clause__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(20px, 2.6vw, 28px);
  font-weight: 600;
  letter-spacing: .01em;
  color: var(--ice);
}

.usage-anchor {
  margin-left: auto;
}

.clause__lede {
  max-width: 66ch;
  margin: 0 0 16px;
  font-size: var(--fs-16);
  line-height: 1.75;
  color: var(--ice-soft);
}

.clause__list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.clause__list li {
  position: relative;
  padding-left: 24px;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--cool);
}

.clause__list li::before {
  content: "";
  position: absolute;
  top: .72em;
  left: 2px;
  width: 7px;
  height: 7px;
  border: 1px solid var(--cyan);
  transform: rotate(45deg);
}

.clause__list a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* 第 06 条重色分区 */
.clause--contact {
  padding: clamp(20px, 3.4vw, 32px);
  border: 1px solid rgba(201, 168, 106, .28);
  background: linear-gradient(155deg, rgba(59, 23, 34, .94), rgba(11, 42, 33, .9) 68%);
}

.clause--contact .clause__num {
  color: var(--orange);
}

.clause--contact .clause__list li::before {
  border-color: var(--orange);
}

.usage-contact {
  display: grid;
  gap: 10px;
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid rgba(201, 168, 106, .22);
}

.usage-contact__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 14px;
}

.usage-contact__label {
  min-width: 72px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--sand);
}

.usage-contact__value {
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  color: var(--ice);
  overflow-wrap: anywhere;
}

/* 复制按钮页面级处理 */
.page-disclaimer .copy-btn {
  padding: 5px 10px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: rgba(73, 242, 208, .08);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  line-height: 1.2;
  cursor: pointer;
  transition: background .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease);
}

.page-disclaimer .copy-btn:hover {
  background: rgba(73, 242, 208, .18);
}

.page-disclaimer .copy-btn:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-disclaimer .copy-btn.is-copied {
  border-color: var(--orange);
  color: var(--orange);
}

/* 页尾收束 */
.usage-tail {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: clamp(36px, 6vw, 64px);
  padding-top: clamp(20px, 3vw, 32px);
  border-top: 1px solid var(--line-soft);
}

.usage-tail p {
  max-width: 56ch;
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--cool);
}

.usage-tail__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* 平板与桌面 */
@media (min-width: 900px) {
  .usage-manual {
    grid-template-columns: minmax(200px, 262px) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 72px);
  }

  .usage-toc {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .usage-toc__list {
    grid-template-columns: minmax(0, 1fr);
    gap: 2px;
  }
}

@media (min-width: 1000px) {
  .usage-hero {
    grid-template-columns: minmax(0, 1.6fr) minmax(300px, 1fr);
    align-items: start;
  }
}

/* 窄屏细节 */
@media (max-width: 520px) {
  .usage-toc__list {
    grid-template-columns: minmax(0, 1fr);
  }

  .clause__head {
    gap: 8px 10px;
  }

  .usage-anchor {
    margin-left: 0;
  }

  .usage-tail {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-disclaimer .copy-btn,
  .usage-toc__list a,
  .page-disclaimer .breadcrumb a {
    transition: none;
  }

  .usage-seal {
    transform: none;
  }
}

@media print {
  .page-disclaimer {
    background: none;
    color: #000;
  }

  .page-disclaimer .usage-toc,
  .page-disclaimer .usage-anchor,
  .page-disclaimer .usage-copy,
  .page-disclaimer .usage-tail,
  .page-disclaimer .usage-banner {
    display: none;
  }
}