.page-disclaimer {
  --usage-rail: 236px;
  --usage-gap: clamp(28px, 4vw, 64px);
  --usage-clause-gap: clamp(44px, 6vw, 84px);
}

/* ---------- 首屏：条款入口区 ---------- */
.page-disclaimer .usage-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(28px, 4.5vw, 56px) 0 clamp(40px, 6vw, 72px);
  background: linear-gradient(168deg, var(--pitch) 0%, var(--pitch-2) 34%, var(--ink) 100%);
  border-bottom: 1px solid var(--line);
}

.page-disclaimer .usage-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(31, 60, 42, .55) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(31, 60, 42, .55) 1px, transparent 1px);
  background-size: 84px 84px;
  -webkit-mask-image: radial-gradient(ellipse 90% 80% at 22% 8%, #000 0%, transparent 72%);
  mask-image: radial-gradient(ellipse 90% 80% at 22% 8%, #000 0%, transparent 72%);
}

.page-disclaimer .usage-hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
  margin: 0;
  opacity: .26;
  pointer-events: none;
}

.page-disclaimer .usage-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 66% 42%;
  display: block;
}

.page-disclaimer .usage-hero__inner {
  position: relative;
  z-index: 2;
}

.page-disclaimer .usage-hero .breadcrumbs {
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-disclaimer .usage-hero .breadcrumbs__link {
  color: var(--muted);
  transition: color var(--ease);
}

.page-disclaimer .usage-hero .breadcrumbs__link:hover {
  color: var(--lime);
}

.page-disclaimer .usage-hero__title {
  margin: 14px 0 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 6.2vw, 66px);
  line-height: 1.05;
  letter-spacing: -.02em;
  color: var(--white);
}

.page-disclaimer .usage-hero__lede {
  max-width: 62ch;
  color: var(--text);
  font-size: clamp(15px, 1.8vw, 18px);
  line-height: 1.85;
}

.page-disclaimer .usage-hero__chips {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 主体布局：索引 + 条款 ---------- */
.page-disclaimer .usage-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
  padding: clamp(36px, 5.5vw, 72px) 0 clamp(56px, 8vw, 104px);
}

/* ---------- 侧边条款索引 ---------- */
.page-disclaimer .usage-toc {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 16px 0;
}

.page-disclaimer .usage-toc__title {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-disclaimer .usage-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
}

.page-disclaimer .usage-toc__link {
  display: block;
  padding: 4px 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .02em;
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--ease), border-color var(--ease);
}

.page-disclaimer .usage-toc__link:hover,
.page-disclaimer .usage-toc__link.is-current {
  color: var(--lime);
  border-bottom-color: var(--lime-a38);
}

.page-disclaimer .usage-toc__link.is-current {
  font-weight: 700;
}

/* ---------- 条款正文 ---------- */
.page-disclaimer .usage-body {
  min-width: 0;
}

.page-disclaimer .clause {
  scroll-margin-top: calc(var(--header-h) + 28px);
}

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

.page-disclaimer .clause__num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--lime);
  margin-bottom: 12px;
  padding: 4px 10px;
  border-radius: var(--r-pill);
  background: var(--lime-a08);
  border: 1px solid var(--line);
}

.page-disclaimer .clause__title {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 3.4vw, 34px);
  line-height: 1.2;
  letter-spacing: -.01em;
  color: var(--white);
}

.page-disclaimer .clause__text {
  margin: 0 0 1.05em;
  color: var(--text);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.9;
}

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

.page-disclaimer .clause__text a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid var(--lime-a38);
  transition: border-color var(--ease);
}

.page-disclaimer .clause__text a:hover {
  border-bottom-color: var(--lime);
}

.page-disclaimer .clause__list {
  list-style: none;
  margin: 0 0 1.2em;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-disclaimer .clause__item {
  position: relative;
  padding-left: 24px;
  color: var(--text);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
}

.page-disclaimer .clause__item::before {
  content: "";
  position: absolute;
  left: 3px;
  top: .68em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 12px var(--lime-a38);
}

.page-disclaimer .clause__callout {
  margin: 22px 0 0;
  padding: 18px 20px;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  border-left: 3px solid var(--lime);
  background: var(--lime-a08);
  color: var(--text);
  font-size: clamp(14px, 1.5vw, 16px);
  line-height: 1.85;
}

/* ---------- 收尾动作区 ---------- */
.page-disclaimer .usage-actions {
  margin-top: var(--usage-clause-gap);
  padding: clamp(26px, 4vw, 44px);
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background:
    radial-gradient(circle at 88% 12%, var(--orange-a24) 0%, transparent 42%),
    linear-gradient(150deg, var(--pitch-2) 0%, var(--ink) 100%);
  display: grid;
  gap: 22px;
}

.page-disclaimer .usage-actions__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(20px, 2.6vw, 26px);
  line-height: 1.25;
  color: var(--white);
}

.page-disclaimer .usage-actions__desc {
  margin: 0;
  max-width: 60ch;
  color: var(--text);
  font-size: clamp(14px, 1.5vw, 16px);
  line-height: 1.85;
}

.page-disclaimer .usage-actions__btns {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-disclaimer .usage-actions__btns .btn {
  min-width: 148px;
  justify-content: center;
}

/* ---------- 桌面端：右侧固定索引 ---------- */
@media (min-width: 960px) {
  .page-disclaimer .usage-layout {
    grid-template-columns: var(--usage-rail) minmax(0, 1fr);
    gap: clamp(40px, 5vw, 76px);
    align-items: start;
  }

  .page-disclaimer .usage-toc {
    position: sticky;
    top: calc(var(--header-h) + 32px);
    border-top: 0;
    border-bottom: 0;
    border-left: 1px solid var(--line);
    padding: 0 0 0 20px;
  }

  .page-disclaimer .usage-toc__list {
    display: grid;
    flex-wrap: nowrap;
    gap: 4px;
  }

  .page-disclaimer .usage-toc__link {
    padding: 6px 0;
  }

  .page-disclaimer .usage-actions {
    grid-template-columns: minmax(0, 1.4fr) auto;
    align-items: center;
    gap: 28px;
  }
}

@media (min-width: 1280px) {
  .page-disclaimer .usage-hero__media img {
    object-position: 72% 38%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-disclaimer .usage-toc__link,
  .page-disclaimer .clause__text a,
  .page-disclaimer .usage-hero .breadcrumbs__link {
    transition: none;
  }
}