.page-disclaimer {
  --u-gutter: clamp(16px, 4vw, 40px);
  --u-measure: 72ch;
  --u-rule: var(--line);
  padding: 0 0 72px;
}

/* ---------- 面包屑 ---------- */

.page-disclaimer .usage-crumb {
  max-width: min(100% - 2 * var(--u-gutter), var(--shell));
  margin: 0 auto;
  padding-top: 18px;
}

/* ---------- 顶部窄横幅 ---------- */

.page-disclaimer .usage-banner {
  position: relative;
  max-width: min(100% - 2 * var(--u-gutter), var(--shell));
  margin: 14px auto 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--ink-800);
  isolation: isolate;
}

.page-disclaimer .usage-banner-media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-disclaimer .usage-banner-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 38%;
}

.page-disclaimer .usage-banner-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(96deg, rgba(4, 35, 27, .97) 0%, rgba(4, 35, 27, .86) 46%, rgba(4, 35, 27, .44) 100%),
    radial-gradient(120% 90% at 88% 12%, rgba(41, 242, 192, .18) 0%, rgba(41, 242, 192, 0) 62%);
}

.page-disclaimer .usage-banner-copy {
  position: relative;
  z-index: 1;
  padding: clamp(30px, 6vw, 64px) clamp(20px, 5vw, 60px);
  max-width: 780px;
}

.page-disclaimer .usage-banner-copy .eyebrow {
  color: var(--accent);
}

.page-disclaimer .usage-banner-copy h1 {
  margin: 14px 0 0;
  font-size: clamp(27px, 5.6vw, 52px);
  line-height: 1.14;
  font-weight: 900;
  letter-spacing: -.02em;
  color: var(--text);
}

.page-disclaimer .usage-banner-lede {
  margin: 18px 0 0;
  max-width: 56ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 主体两栏 ---------- */

.page-disclaimer .usage-main {
  max-width: min(100% - 2 * var(--u-gutter), var(--shell));
  margin: 36px auto 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
}

/* ---------- 左侧索引条 ---------- */

.page-disclaimer .usage-index {
  display: grid;
  gap: 12px;
  align-content: start;
}

.page-disclaimer .usage-index-title {
  margin: 0;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--muted);
  text-transform: uppercase;
}

.page-disclaimer .usage-index-list {
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  display: flex;
  flex-wrap: nowrap;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-disclaimer .usage-index-list li {
  flex: 0 0 auto;
}

.page-disclaimer .usage-index-list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 15px;
  min-height: 40px;
  border-radius: var(--r-pill);
  border: 1px solid var(--u-rule);
  background: var(--panel);
  color: var(--muted);
  font-size: 13px;
  line-height: 1.3;
  white-space: nowrap;
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-disclaimer .usage-index-list a .mono {
  color: var(--slate);
  font-size: 12px;
  transition: color var(--dur) var(--ease);
}

.page-disclaimer .usage-index-list a:hover,
.page-disclaimer .usage-index-list a:focus-visible {
  color: var(--accent-soft);
  border-color: rgba(41, 242, 192, .5);
}

.page-disclaimer .usage-index-list a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.page-disclaimer .usage-index-list a[aria-current="true"] {
  color: var(--accent);
  border-color: var(--accent);
  background: rgba(41, 242, 192, .09);
}

.page-disclaimer .usage-index-list a[aria-current="true"] .mono {
  color: var(--accent);
}

/* ---------- 条款区块 ---------- */

.page-disclaimer .usage-flow {
  display: grid;
  gap: 0;
  min-width: 0;
}

.page-disclaimer .usage-block {
  padding-top: 26px;
  border-top: 1px solid var(--u-rule);
}

.page-disclaimer .usage-block + .usage-block {
  margin-top: 44px;
}

.page-disclaimer .usage-block-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--u-rule);
  margin-bottom: 20px;
}

.page-disclaimer .usage-num {
  flex: 0 0 auto;
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--accent);
}

.page-disclaimer .usage-block-title {
  margin: 0;
  font-size: clamp(19px, 2.6vw, 27px);
  line-height: 1.3;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--text);
}

.page-disclaimer .usage-block.is-key .usage-block-head {
  border-bottom-color: rgba(255, 90, 46, .55);
}

.page-disclaimer .usage-block.is-key .usage-num {
  color: var(--hot);
}

.page-disclaimer .usage-block-body {
  max-width: var(--u-measure);
  display: grid;
  gap: 16px;
}

.page-disclaimer .usage-block-body p {
  margin: 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--muted);
}

.page-disclaimer .usage-block-body a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(41, 242, 192, .35);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-disclaimer .usage-block-body a:hover,
.page-disclaimer .usage-block-body a:focus-visible {
  color: var(--accent-soft);
  border-bottom-color: var(--accent-soft);
}

.page-disclaimer .usage-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 11px;
}

.page-disclaimer .usage-list li {
  position: relative;
  padding-left: 22px;
  font-size: 15.5px;
  line-height: 1.72;
  color: var(--muted);
}

.page-disclaimer .usage-list li::before {
  content: "";
  position: absolute;
  left: 3px;
  top: .62em;
  width: 7px;
  height: 7px;
  border-radius: 2px;
  background: var(--accent);
  opacity: .6;
  transform: rotate(45deg);
}

.page-disclaimer .usage-block.is-key .usage-list li::before {
  background: var(--hot);
  opacity: .75;
}

.page-disclaimer .usage-note {
  padding-left: 16px;
  border-left: 2px solid rgba(141, 247, 222, .35);
  font-size: 14.5px;
  color: var(--muted);
}

/* ---------- 桌面端两栏 ---------- */

@media (min-width: 960px) {

  .page-disclaimer .usage-main {
    grid-template-columns: 218px minmax(0, 1fr);
    gap: 60px;
    margin-top: 56px;
  }

  .page-disclaimer .usage-index {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    gap: 16px;
  }

  .page-disclaimer .usage-index-list {
    display: grid;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-disclaimer .usage-index-list a {
    border-radius: var(--r-sm);
    border-color: transparent;
    background: transparent;
    padding: 10px 14px;
    border-left: 2px solid transparent;
    white-space: normal;
    font-size: 14px;
  }

  .page-disclaimer .usage-index-list a:hover,
  .page-disclaimer .usage-index-list a:focus-visible {
    background: var(--panel);
    border-color: transparent;
    border-left-color: var(--accent-soft);
    color: var(--text);
  }

  .page-disclaimer .usage-index-list a[aria-current="true"] {
    background: var(--panel);
    border-color: transparent;
    border-left-color: var(--accent);
    color: var(--accent);
  }

  .page-disclaimer .usage-block {
    padding-top: 30px;
  }

  .page-disclaimer .usage-block + .usage-block {
    margin-top: 56px;
  }

}

@media (min-width: 1200px) {

  .page-disclaimer .usage-banner-copy {
    padding-left: 72px;
    padding-right: 72px;
  }

}

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

  .page-disclaimer .usage-index-list a,
  .page-disclaimer .usage-block-body a {
    transition: none;
  }

}
</main>