.page-disclaimer {
  --ua-on-dark: rgba(246, 243, 234, 0.82);
  --ua-on-dark-faint: rgba(246, 243, 234, 0.62);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
}

/* ---------- 首屏 ---------- */
.page-disclaimer .usage-hero {
  position: relative;
  overflow: hidden;
  background: var(--deep);
  color: var(--paper);
  border-bottom: 3px solid var(--edge);
}

.page-disclaimer .usage-hero__media {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.18;
}

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

.page-disclaimer .usage-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 32px;
  padding-block: 48px 52px;
  align-items: start;
}

.page-disclaimer .usage-hero .eyebrow {
  color: var(--tint);
}

.page-disclaimer .usage-hero__title {
  margin: 14px 0 0;
  font-size: clamp(2.5rem, 8vw, 4.75rem);
  font-weight: 900;
  line-height: 0.98;
  letter-spacing: -0.035em;
  color: var(--paper);
}

.page-disclaimer .usage-hero__lede {
  margin: 20px 0 0;
  max-width: 48ch;
  font-size: 1rem;
  line-height: 1.78;
  color: var(--ua-on-dark);
}

.page-disclaimer .usage-version {
  display: grid;
  gap: 10px;
  padding: 22px;
  max-width: 420px;
  background: var(--green);
  border: 2px solid rgba(246, 243, 234, 0.26);
  box-shadow: 6px 6px 0 var(--edge);
}

.page-disclaimer .usage-version__label {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--tint);
}

.page-disclaimer .usage-version__num {
  margin: 0;
  font-family: var(--mono);
  font-size: 1.55rem;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: 0.02em;
  color: var(--stable);
}

.page-disclaimer .usage-version__text {
  margin: 0;
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--ua-on-dark-faint);
}

.page-disclaimer .usage-version__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 4px;
}

/* ---------- 条款目录 ---------- */
.page-disclaimer .usage-toc {
  background: var(--moss);
  border-bottom: 1px solid var(--line);
}

.page-disclaimer .usage-toc__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
}

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

.page-disclaimer .usage-toc__item:first-child {
  border-top: 0;
}

.page-disclaimer .usage-toc__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 14px 4px;
  color: var(--ink);
  font-size: 0.9rem;
  text-decoration: none;
  transition: color 180ms ease-out, background-color 180ms ease-out;
}

.page-disclaimer .usage-toc__link:hover,
.page-disclaimer .usage-toc__link:focus-visible {
  color: var(--signal);
  background: var(--tint);
  outline: none;
}

.page-disclaimer .usage-toc__num {
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--signal);
}

/* ---------- 条款正文 ---------- */
.page-disclaimer .usage-body {
  padding-block: 4px 84px;
  background-color: var(--paper);
  background-image: repeating-linear-gradient(
    180deg,
    rgba(11, 43, 36, 0.055) 0,
    rgba(11, 43, 36, 0.055) 1px,
    transparent 1px,
    transparent 36px
  );
}

.page-disclaimer .usage-clause {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  padding: 32px 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: 24px;
}

.page-disclaimer .usage-clause:first-of-type {
  border-top: 3px solid var(--deep);
}

.page-disclaimer .usage-clause__num {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--signal);
}

.page-disclaimer .usage-clause__title {
  margin: 0 0 12px;
  font-size: 1.3rem;
  font-weight: 800;
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-disclaimer .usage-clause__content p {
  margin: 0 0 12px;
  font-size: 0.975rem;
  line-height: 1.82;
  color: var(--ink);
}

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

.page-disclaimer .usage-clause__content .link-arrow {
  color: var(--green);
  font-weight: 600;
  text-decoration-color: var(--signal);
  text-underline-offset: 3px;
}

.page-disclaimer .usage-clause__content .link-arrow:hover,
.page-disclaimer .usage-clause__content .link-arrow:focus-visible {
  color: var(--signal);
}

.page-disclaimer .usage-clause__content .callout {
  margin-top: 18px;
  background: var(--moss);
}

/* ---------- 反馈联系方式 ---------- */
.page-disclaimer .usage-contact {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  margin: 6px 0 18px;
  padding: 16px 18px;
  background: var(--moss);
  border: 2px solid var(--line);
  border-left: 6px solid var(--signal);
}

.page-disclaimer .usage-contact__label {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-disclaimer .usage-contact__mail {
  font-family: var(--mono);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--ink);
  word-break: break-all;
}

.page-disclaimer .usage-contact__copy {
  margin-left: auto;
  min-height: 36px;
}

/* ---------- 中等屏幕 ---------- */
@media (min-width: 720px) {
  .page-disclaimer .usage-hero__inner {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    gap: 40px;
    padding-block: 64px 72px;
    align-items: center;
  }

  .page-disclaimer .usage-hero__lede {
    font-size: 1.05rem;
  }

  .page-disclaimer .usage-toc__list {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-disclaimer .usage-toc__item {
    border-top: 0;
    border-left: 1px solid var(--line);
  }

  .page-disclaimer .usage-toc__item:first-child {
    border-left: 0;
  }

  .page-disclaimer .usage-toc__link {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    padding: 20px 16px;
  }

  .page-disclaimer .usage-clause {
    grid-template-columns: 88px minmax(0, 1fr);
    gap: 28px;
    padding: 44px 0;
  }

  .page-disclaimer .usage-clause__num {
    font-size: 1.1rem;
  }

  .page-disclaimer .usage-clause__title {
    font-size: 1.5rem;
  }

  .page-disclaimer .usage-clause__content p {
    font-size: 1rem;
    line-height: 1.85;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 1024px) {
  .page-disclaimer .usage-clause {
    grid-template-columns: 110px minmax(0, 1fr);
    gap: 40px;
    padding: 52px 0;
  }

  .page-disclaimer .usage-clause__content {
    max-width: 72ch;
  }

  .page-disclaimer .usage-version {
    justify-self: end;
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-disclaimer .usage-toc__link {
    transition: none;
  }
}
</main>