.page-disclaimer {
  --usage-example-line: rgba(79, 227, 208, 0.42);
  --usage-example-bg: rgba(79, 227, 208, 0.055);
  --usage-example-dash: rgba(79, 227, 208, 0.28);
}

.page-disclaimer .breadcrumb {
  padding: 20px 0 0;
}

/* ---------- 首屏 ---------- */

.page-disclaimer .usage-intro {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  padding: 24px 0 36px;
  border-bottom: var(--rule);
}

.page-disclaimer .usage-kicker {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
  margin: 0 0 14px;
}

.page-disclaimer .usage-intro h1 {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(28px, 6.6vw, 44px);
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: var(--fg);
  margin: 0 0 18px;
}

.page-disclaimer .usage-lead {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--fg);
  margin: 0 0 24px;
  max-width: 54ch;
}

.page-disclaimer .usage-quick {
  list-style: none;
  margin: 0;
  padding: 16px 0 0;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 10px 30px;
  font-family: var(--font-sans);
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

.page-disclaimer .usage-quick li {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
}

.page-disclaimer .usage-quick .num {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: -0.02em;
}

.page-disclaimer .usage-intro-figure {
  margin: 0;
  border: var(--rule);
  background: var(--panel-deep);
}

.page-disclaimer .usage-intro-figure .figure-media {
  display: block;
  overflow: hidden;
  background: var(--panel-deep);
}

.page-disclaimer .usage-intro-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-disclaimer .usage-intro-figure .figure-caption {
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.65;
  color: var(--muted);
  padding: 10px 14px;
  border-top: var(--rule);
}

/* ---------- 条款目录条 ---------- */

.page-disclaimer .clause-rail {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 20px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line-2);
  position: sticky;
  top: 0;
  z-index: 6;
  background: var(--bg);
}

.page-disclaimer .clause-rail-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-disclaimer .clause-rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
}

.page-disclaimer .clause-rail-list a {
  display: inline-flex;
  align-items: baseline;
  gap: 5px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.03em;
  color: var(--fg);
  text-decoration: none;
  padding: 3px 0;
  border-bottom: 1px solid transparent;
  transition: color 160ms ease, border-color 160ms ease;
}

.page-disclaimer .clause-rail-list a .num {
  color: var(--orange);
  font-weight: 700;
}

.page-disclaimer .clause-rail-list a:hover,
.page-disclaimer .clause-rail-list a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-disclaimer .clause-rail-list a[aria-current="true"] {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-disclaimer .clause-rail-hint {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--muted);
  margin: 0 0 0 auto;
}

/* ---------- 条款主体 ---------- */

.page-disclaimer .clause-stack {
  padding-bottom: 8px;
}

.page-disclaimer .clause {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 8px 14px;
  padding: 26px 0;
  scroll-margin-top: 130px;
}

.page-disclaimer .clause + .clause {
  border-top: var(--rule);
}

.page-disclaimer .clause-mark {
  grid-row: 1;
  grid-column: 1;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.35;
  letter-spacing: 0.02em;
  color: var(--orange);
}

.page-disclaimer .clause-main {
  grid-row: 1;
  grid-column: 2;
  min-width: 0;
}

.page-disclaimer .clause-title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 20px;
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--fg);
  margin: 0 0 12px;
}

.page-disclaimer .clause-main p {
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.78;
  color: var(--fg);
  margin: 0 0 12px;
  max-width: 62ch;
}

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

.page-disclaimer .clause-main a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(79, 227, 208, 0.45);
}

.page-disclaimer .clause-main a:hover,
.page-disclaimer .clause-main a:focus-visible {
  border-bottom-color: var(--cyan);
}

/* 场景示例 */

.page-disclaimer .clause-example {
  grid-row: 2;
  grid-column: 1 / -1;
  min-width: 0;
}

.page-disclaimer .example-details {
  border: 1px solid var(--usage-example-line);
  background: var(--usage-example-bg);
  padding: 11px 14px 13px;
}

.page-disclaimer .example-details summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}

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

.page-disclaimer .example-details summary::before {
  content: "›";
  font-size: 16px;
  line-height: 1;
  transition: transform 180ms ease;
}

.page-disclaimer .example-details[open] summary::before {
  transform: rotate(90deg);
}

.page-disclaimer .example-body {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed var(--usage-example-dash);
}

.page-disclaimer .example-body p {
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.72;
  color: var(--fg);
  margin: 0 0 8px;
}

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

/* 联系方式 */

.page-disclaimer .usage-contact {
  margin-top: 16px;
  padding: 14px 0 0;
  border-top: 1px solid var(--line-2);
}

.page-disclaimer .usage-contact p {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 2;
  color: var(--fg);
  margin: 0;
}

.page-disclaimer .copy-btn {
  background: none;
  border: 0;
  padding: 0;
  font: inherit;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--cyan);
  cursor: pointer;
  border-bottom: 1px solid rgba(79, 227, 208, 0.4);
  transition: border-color 160ms ease, color 160ms ease;
}

.page-disclaimer .copy-btn:hover,
.page-disclaimer .copy-btn:focus-visible {
  border-bottom-color: var(--cyan);
  color: #7ff0e2;
}

/* ---------- 页底延伸路径 ---------- */

.page-disclaimer .usage-paths {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  margin-top: 36px;
  border-top: 1px solid var(--line-2);
}

.page-disclaimer .usage-path {
  display: block;
  padding: 20px 0;
  text-decoration: none;
  color: inherit;
  border-bottom: var(--rule);
}

.page-disclaimer .usage-path:last-child {
  border-bottom: 0;
}

.page-disclaimer .usage-path-title {
  display: block;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.01em;
  color: var(--fg);
  margin-bottom: 8px;
  transition: color 160ms ease;
}

.page-disclaimer .usage-path-desc {
  display: block;
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
}

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

/* ---------- 桌面增强 ---------- */

@media (min-width: 900px) {

  .page-disclaimer .usage-intro {
    grid-template-columns: 7fr 5fr;
    gap: 56px;
    padding: 48px 0 64px;
    align-items: end;
  }

  .page-disclaimer .usage-lead {
    font-size: 17px;
  }

  .page-disclaimer .clause-rail {
    padding: 14px 0;
    gap: 14px 26px;
  }

  .page-disclaimer .clause {
    grid-template-columns: 84px minmax(0, 1fr) 320px;
    gap: 0 40px;
    padding: 42px 0;
    scroll-margin-top: 120px;
  }

  .page-disclaimer .clause-mark {
    grid-row: 1;
    grid-column: 1;
    font-size: 26px;
    line-height: 1.05;
    padding-right: 24px;
    border-right: 1px solid var(--line);
    align-self: start;
  }

  .page-disclaimer .clause-main {
    grid-row: 1;
    grid-column: 2;
  }

  .page-disclaimer .clause-title {
    font-size: 22px;
    margin-bottom: 14px;
  }

  .page-disclaimer .clause-main p {
    font-size: 16px;
  }

  .page-disclaimer .clause-example {
    grid-row: 1;
    grid-column: 3;
    align-self: start;
  }

  .page-disclaimer .usage-paths {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 40px;
  }

  .page-disclaimer .usage-path {
    padding: 26px 0;
    border-bottom: 0;
    border-top: 0;
  }

  .page-disclaimer .usage-path + .usage-path {
    padding-left: 40px;
    border-left: var(--rule);
  }
}

@media (min-width: 1200px) {

  .page-disclaimer .clause {
    grid-template-columns: 96px minmax(0, 1fr) 360px;
    gap: 0 56px;
  }

  .page-disclaimer .clause-main p {
    max-width: 58ch;
  }
}

@media (prefers-reduced-motion: reduce) {

  .page-disclaimer .example-details summary::before,
  .page-disclaimer .clause-rail-list a,
  .page-disclaimer .copy-btn,
  .page-disclaimer .usage-path-title {
    transition: none;
  }
}