.page-disclaimer {
  --u-toc-w: 210px;
  --u-status-w: 250px;
  --u-grid-line: rgba(42, 58, 82, 0.34);
}

/* ===== 面包屑位置 ===== */
.page-disclaimer .breadcrumbs {
  margin: 1rem 0 0.75rem;
}

/* ===== 首屏 ===== */
.page-disclaimer .usage-hero {
  position: relative;
  border-top: var(--bd);
  border-bottom: var(--bd);
  background:
    radial-gradient(circle at 16% 28%, rgba(0, 229, 255, 0.11), transparent 46%),
    radial-gradient(circle at 90% 72%, rgba(124, 77, 255, 0.14), transparent 52%),
    linear-gradient(180deg, var(--c-ink), var(--c-panel));
  overflow: hidden;
}

.page-disclaimer .usage-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--u-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--u-grid-line) 1px, transparent 1px);
  background-size: 44px 44px, 44px 44px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), rgba(0, 0, 0, 0));
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), rgba(0, 0, 0, 0));
  pointer-events: none;
}

.page-disclaimer .usage-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.75rem);
  padding: clamp(2rem, 5vw, 3.75rem) 0 clamp(1.75rem, 4vw, 3rem);
}

.page-disclaimer .usage-hero__title {
  margin: 0.65rem 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.85rem, 4.4vw, 3rem);
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--c-text);
  text-wrap: balance;
}

.page-disclaimer .usage-hero__lead {
  max-width: 46ch;
  margin: 1rem 0 0;
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--c-text-soft);
}

.page-disclaimer .usage-hero__facts {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 0.7rem;
  margin: 1.4rem 0 0;
  padding: 0;
  font-size: 0.8125rem;
}

.page-disclaimer .usage-hero__facts li {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.75rem;
  border: var(--bd);
  background: rgba(11, 18, 32, 0.72);
  color: var(--c-text);
}

.page-disclaimer .usage-hero__facts li::before {
  content: "";
  width: 8px;
  height: 8px;
  flex: none;
  background: var(--c-cyan);
  box-shadow: 0 0 10px var(--c-cyan);
}

.page-disclaimer .usage-hero__figure {
  position: relative;
  margin: 0;
  border: var(--bd);
  background: var(--c-panel);
  box-shadow: var(--shadow-hard);
}

.page-disclaimer .usage-hero__figure::before {
  content: "LIVE / STATUS";
  position: absolute;
  top: 0;
  left: 0;
  z-index: 1;
  padding: 4px 10px;
  background: var(--c-cyan);
  color: var(--c-ink-on-accent);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
}

.page-disclaimer .usage-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 6;
  object-fit: cover;
}

/* ===== 三栏布局 ===== */
.page-disclaimer .usage-layout {
  display: grid;
  grid-template-columns: 1fr;
  grid-template-areas:
    "toc"
    "main"
    "status";
  gap: clamp(1.25rem, 3vw, 2rem);
  padding: clamp(2rem, 5vw, 3.5rem) 0 clamp(1.5rem, 4vw, 2.5rem);
}

.page-disclaimer .usage-toc {
  grid-area: toc;
  border: var(--bd);
  background: var(--c-panel);
  padding: 1.1rem 1.1rem 1.2rem;
}

.page-disclaimer .usage-toc__title {
  margin: 0 0 0.75rem;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--c-muted);
  text-transform: uppercase;
}

.page-disclaimer .usage-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.25rem;
}

.page-disclaimer .usage-toc__list a {
  display: block;
  padding: 0.45rem 0.5rem;
  font-size: 0.8125rem;
  color: var(--c-text-soft);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-disclaimer .usage-toc__list a:hover,
.page-disclaimer .usage-toc__list a:focus-visible {
  color: var(--c-cyan);
  border-left-color: var(--c-cyan);
  background: rgba(0, 229, 255, 0.06);
  outline: none;
}

/* 主内容 */
.page-disclaimer .usage-main {
  grid-area: main;
  min-width: 0;
  display: grid;
  gap: clamp(1.1rem, 2.4vw, 1.6rem);
}

.page-disclaimer .usage-section {
  position: relative;
  scroll-margin-top: calc(var(--header-h) + 1.25rem);
  border: var(--bd);
  background: linear-gradient(180deg, var(--c-card) 0%, var(--c-panel) 100%);
  padding: clamp(1.4rem, 3vw, 2rem) clamp(1.15rem, 3vw, 2rem) clamp(1.5rem, 3vw, 2rem);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-disclaimer .usage-section::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background: linear-gradient(180deg, var(--c-cyan), transparent 75%);
  opacity: 0.55;
}

.page-disclaimer .usage-section:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-hard);
}

.page-disclaimer .usage-section__num {
  margin: 0;
  display: inline-block;
  padding-bottom: 2px;
  border-bottom: 1px solid rgba(0, 229, 255, 0.35);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--c-cyan);
}

.page-disclaimer .usage-section h2 {
  margin: 0.6rem 0 0.8rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.2rem, 2.3vw, 1.5rem);
  line-height: 1.2;
  color: var(--c-text);
}

.page-disclaimer .usage-section p {
  max-width: 68ch;
  margin: 0 0 0.9rem;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--c-text-soft);
}

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

.page-disclaimer .usage-section strong {
  color: var(--c-cyan);
  font-weight: 600;
}

/* 右侧状态摘要 */
.page-disclaimer .usage-status {
  grid-area: status;
  border: var(--bd);
  background: var(--c-panel);
  padding: 1.05rem 1.1rem 1.15rem;
}

.page-disclaimer .usage-status__title {
  margin: 0 0 0.85rem;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--c-muted);
}

.page-disclaimer .usage-status__list {
  margin: 0;
  display: grid;
  gap: 0.6rem;
}

.page-disclaimer .usage-status__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem;
  padding-top: 0.6rem;
  border-top: 1px dashed var(--c-line);
}

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

.page-disclaimer .usage-status__row dt {
  font-size: 0.8125rem;
  color: var(--c-muted);
  line-height: 1.5;
}

.page-disclaimer .usage-status__row dd {
  margin: 0;
  font-size: 0.875rem;
  color: var(--c-text);
  text-align: right;
  white-space: nowrap;
}

.page-disclaimer .usage-status__hl {
  color: var(--c-orange);
  text-shadow: var(--glow-orange);
}

.page-disclaimer .usage-status__note {
  margin: 1rem 0 0;
  padding-top: 0.85rem;
  border-top: var(--bd);
  font-size: 0.78rem;
  line-height: 1.7;
  color: var(--c-muted);
}

/* ===== 页尾延伸入口 ===== */
.page-disclaimer .usage-next {
  margin-bottom: clamp(2rem, 5vw, 3.5rem);
  border: var(--bd);
  border-left: 4px solid var(--c-orange);
  background: var(--c-card);
  padding: 1.1rem clamp(1rem, 2.5vw, 1.5rem) 1.2rem;
  display: grid;
  gap: 0.75rem;
}

.page-disclaimer .usage-next__k {
  margin: 0;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--c-muted);
}

.page-disclaimer .usage-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 0.6rem;
}

.page-disclaimer .usage-next__links a {
  display: inline-block;
  padding: 0.5rem 0.9rem;
  border: var(--bd);
  font-size: 0.875rem;
  color: var(--c-text);
  text-decoration: none;
  background: var(--c-panel);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-disclaimer .usage-next__links a:hover,
.page-disclaimer .usage-next__links a:focus-visible {
  color: var(--c-ink-on-accent);
  background: var(--c-cyan);
  border-color: var(--c-cyan);
  outline: none;
}

/* ===== 显现动效 ===== */
.page-disclaimer [data-reveal] {
  opacity: 1;
}

.page-disclaimer.js-ready [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 420ms var(--ease), transform 420ms var(--ease);
}

.page-disclaimer.js-ready [data-reveal].is-in {
  opacity: 1;
  transform: none;
}

/* ===== 桌面端 ===== */
@media (min-width: 780px) {
  .page-disclaimer .usage-hero__inner {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (min-width: 960px) {
  .page-disclaimer .usage-hero__inner {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: center;
  }

  .page-disclaimer .usage-layout {
    grid-template-columns: var(--u-toc-w) minmax(0, 1fr) var(--u-status-w);
    grid-template-areas: "toc main status";
    align-items: start;
    column-gap: clamp(1.75rem, 3vw, 2.75rem);
  }

  .page-disclaimer .usage-toc,
  .page-disclaimer .usage-status {
    position: sticky;
    top: calc(var(--header-h) + 1rem);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-disclaimer .usage-section,
  .page-disclaimer .usage-toc__list a,
  .page-disclaimer .usage-next__links a {
    transition: none;
  }

  .page-disclaimer .usage-section:hover {
    transform: none;
  }

  .page-disclaimer.js-ready [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}