.page-disclaimer {
  --usage-rail: 2.75rem;
  --usage-measure: 40rem;
  position: relative;
  isolation: isolate;
  color: var(--ink-star);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.85;
  background:
    radial-gradient(110% 55% at 84% -8%, rgba(139, 92, 246, 0.18), transparent 62%),
    radial-gradient(90% 45% at 2% 44%, rgba(34, 211, 238, 0.07), transparent 68%),
    var(--ink-void);
  padding-bottom: clamp(3.5rem, 9vw, 7rem);
  overflow-x: clip;
}

.page-disclaimer .usage-shell {
  width: min(calc(100% - 2 * var(--gutter)), 72rem);
  margin-inline: auto;
}

/* ---------- 面包屑 ---------- */
.page-disclaimer .breadcrumbs {
  padding-top: clamp(1.5rem, 4vw, 2.5rem);
  font-family: var(--font-mono);
  font-size: var(--fs-cap);
  letter-spacing: 0.04em;
  color: var(--ink-silver);
}

.page-disclaimer .breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-disclaimer .breadcrumbs li + li::before {
  content: "/";
  margin-inline: 0.55rem;
  color: var(--line);
}

.page-disclaimer .breadcrumbs a {
  color: var(--ink-silver);
  text-decoration: none;
  transition: color var(--ease);
}

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

.page-disclaimer .breadcrumbs [aria-current="page"] {
  color: var(--ink-star);
}

/* ---------- 首屏 ---------- */
.page-disclaimer .usage-masthead {
  display: grid;
  gap: clamp(1.75rem, 5vw, 3.25rem);
  padding-block: clamp(1.75rem, 5vw, 3rem) clamp(2.25rem, 6vw, 4rem);
}

.page-disclaimer .rail-index {
  margin: 0 0 0.9rem;
  font-family: var(--font-mono);
  font-size: var(--fs-cap);
  letter-spacing: 0.16em;
  color: var(--violet);
}

.page-disclaimer h1 {
  margin: 0 0 1.15rem;
  max-width: 17em;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: var(--fs-h1);
  line-height: 1.14;
  letter-spacing: 0.015em;
  color: var(--ink-star);
  text-wrap: balance;
}

.page-disclaimer .usage-lead {
  margin: 0;
  max-width: 35em;
  color: var(--ink-silver);
  font-size: 1.0625rem;
  line-height: 1.9;
}

.page-disclaimer .usage-media {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-orbit);
}

.page-disclaimer .usage-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  filter: saturate(0.9) brightness(0.82);
}

.page-disclaimer .usage-media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(115deg, rgba(34, 211, 238, 0.16), transparent 46%, rgba(244, 114, 182, 0.16));
}

/* ---------- 条款刻度盘 ---------- */
.page-disclaimer .usage-ledger {
  border-top: 1px solid var(--line);
  padding-bottom: clamp(2.5rem, 7vw, 4.5rem);
}

.page-disclaimer .usage-clause {
  position: relative;
  display: grid;
  grid-template-columns: var(--usage-rail) minmax(0, 1fr);
  gap: 0 1.35rem;
  padding-block: clamp(1.75rem, 5vw, 2.75rem);
  scroll-margin-top: 7rem;
}

.page-disclaimer .usage-clause + .usage-clause {
  border-top: 1px solid var(--line);
}

.page-disclaimer .usage-clause__anchor {
  position: relative;
  display: grid;
  place-items: center;
  width: var(--usage-rail);
  height: var(--usage-rail);
  margin-top: 0.3rem;
  border-radius: 50%;
  text-decoration: none;
  color: var(--ink-silver);
  transition: color var(--ease);
}

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

.page-disclaimer .usage-clause__num {
  position: relative;
  z-index: 1;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
}

.page-disclaimer .usage-dial {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.page-disclaimer .usage-dial__track {
  fill: none;
  stroke: var(--line);
  stroke-width: 1.5;
}

.page-disclaimer .usage-dial__arc {
  fill: none;
  stroke: var(--cyan);
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-dasharray: 113.1;
  stroke-dashoffset: 113.1;
  transition: stroke-dashoffset 900ms cubic-bezier(0.22, 0.61, 0.36, 1);
}

.page-disclaimer .usage-clause.is-inview .usage-dial__arc,
.page-disclaimer .usage-clause:hover .usage-dial__arc {
  stroke-dashoffset: 0;
}

.page-disclaimer .usage-clause__body {
  max-width: var(--usage-measure);
}

.page-disclaimer .usage-clause__body h2 {
  margin: 0 0 0.85rem;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(1.15rem, 2.1vw, 1.45rem);
  line-height: 1.38;
  letter-spacing: 0.015em;
  color: var(--ink-star);
}

.page-disclaimer .usage-clause__body p {
  margin: 0 0 0.9rem;
  color: var(--ink-silver);
  line-height: 1.9;
}

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

.page-disclaimer .usage-clause__body a {
  color: var(--ink-star);
  text-decoration: none;
  border-bottom: 1px solid var(--violet);
  transition: color var(--ease), border-color var(--ease);
}

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

.page-disclaimer .usage-note {
  position: relative;
  padding-left: 1rem;
  border-left: 2px solid var(--pink);
  color: var(--ink-star);
  font-size: 0.9688rem;
}

/* ---------- 折叠面板 ---------- */
.page-disclaimer .fold {
  margin-top: 1.15rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-orbit);
}

.page-disclaimer .fold summary {
  display: block;
  padding: 0.85rem 1.1rem;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-head);
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--ink-star);
}

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

.page-disclaimer .fold summary::after {
  content: "+";
  float: right;
  font-family: var(--font-mono);
  font-weight: 400;
  color: var(--violet);
  transition: color var(--ease);
}

.page-disclaimer .fold[open] summary::after {
  content: "\2013";
  color: var(--cyan);
}

.page-disclaimer .fold__body {
  padding: 0.9rem 1.1rem 1.1rem;
  border-top: 1px solid var(--line);
  color: var(--ink-silver);
  font-size: 0.9688rem;
  line-height: 1.85;
}

.page-disclaimer .fold__body p {
  margin: 0;
}

/* ---------- 底部入口 ---------- */
.page-disclaimer .usage-foot {
  padding-top: clamp(1.5rem, 4vw, 2.5rem);
}

.page-disclaimer .usage-foot__inner {
  position: relative;
  padding: clamp(1.6rem, 5vw, 2.75rem);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(140deg, rgba(139, 92, 246, 0.15), rgba(34, 211, 238, 0.06) 58%, transparent 90%),
    var(--ink-orbit);
  overflow: hidden;
}

.page-disclaimer .usage-foot__inner::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--violet), var(--cyan), transparent);
}

.page-disclaimer .usage-foot__kicker {
  margin: 0 0 0.6rem;
  font-family: var(--font-mono);
  font-size: var(--fs-cap);
  letter-spacing: 0.14em;
  color: var(--pink);
}

.page-disclaimer .usage-foot h2 {
  margin: 0 0 0.85rem;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: var(--fs-h2);
  line-height: 1.3;
  letter-spacing: 0.015em;
  color: var(--ink-star);
  max-width: 20em;
}

.page-disclaimer .usage-foot p {
  margin: 0;
  max-width: 36em;
  color: var(--ink-silver);
  line-height: 1.9;
}

.page-disclaimer .usage-foot__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

/* ---------- 断点 ---------- */
@media (min-width: 48rem) {
  .page-disclaimer {
    --usage-rail: 3.75rem;
  }

  .page-disclaimer .usage-clause {
    gap: 0 2.25rem;
  }

  .page-disclaimer .usage-clause__body h2 {
    font-size: clamp(1.3rem, 2.2vw, 1.6rem);
  }
}

@media (min-width: 62rem) {
  .page-disclaimer .usage-masthead {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: center;
    gap: clamp(2rem, 5vw, 4.5rem);
  }

  .page-disclaimer .usage-media {
    align-self: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-disclaimer .usage-dial__arc {
    transition: none;
  }

  .page-disclaimer .usage-clause__anchor,
  .page-disclaimer .breadcrumbs a,
  .page-disclaimer .usage-clause__body a,
  .page-disclaimer .fold summary::after {
    transition: none;
  }
}