.page-disclaimer {
  --usage-rule: rgba(11, 27, 58, 0.14);
  --usage-ink: var(--graphite);
  display: block;
}

/* ============ 顶部 ============ */
.page-disclaimer .usage-hero {
  position: relative;
  padding: calc(var(--header-offset) + 26px) 0 0;
  background:
    radial-gradient(120% 90% at 86% 6%, rgba(255, 90, 31, 0.30), transparent 56%),
    linear-gradient(158deg, var(--navy) 0%, var(--navy-deep) 54%, var(--indigo) 100%);
  overflow: hidden;
  isolation: isolate;
}

.page-disclaimer .usage-hero::before {
  content: "";
  position: absolute;
  top: -14%;
  right: -16%;
  width: 52%;
  aspect-ratio: 1;
  background: linear-gradient(150deg, rgba(255, 90, 31, 0.34), rgba(255, 90, 31, 0));
  clip-path: polygon(32% 0, 100% 0, 100% 68%, 68% 100%, 0 54%);
  pointer-events: none;
}

.page-disclaimer .usage-hero .shell {
  position: relative;
  z-index: 1;
}

.page-disclaimer .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 26px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: rgba(247, 244, 239, 0.60);
}

.page-disclaimer .breadcrumbs a {
  color: rgba(247, 244, 239, 0.80);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-disclaimer .breadcrumbs a:hover {
  color: var(--cloud);
  border-bottom-color: var(--flame);
}

.page-disclaimer .eyebrow {
  display: inline-block;
  margin: 0 0 16px;
  padding: 5px 13px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--glass-line);
  background: var(--glass);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-disclaimer .usage-hero h1 {
  margin: 0 0 22px;
  max-width: 17ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 6.2vw, 68px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--cloud);
}

.page-disclaimer .usage-hero .lede {
  max-width: 60ch;
  margin: 0 0 clamp(36px, 6vw, 56px);
  font-size: clamp(16px, 1.6vw, 18.5px);
  line-height: 1.82;
  color: rgba(247, 244, 239, 0.82);
}

.page-disclaimer .usage-hero__figure {
  position: relative;
  z-index: 1;
  margin: 0;
  padding: 0 clamp(18px, 5vw, 60px) clamp(20px, 4vw, 44px);
}

.page-disclaimer .usage-hero__figure img {
  display: block;
  width: 100%;
  max-width: var(--shell);
  height: auto;
  margin: 0 auto;
  aspect-ratio: 1400 / 800;
  object-fit: cover;
  border-radius: 22px;
  border: 1px solid var(--glass-line);
  background: linear-gradient(140deg, var(--indigo), var(--navy-deep));
  box-shadow: var(--shadow-2);
}

/* ============ 条目区 ============ */
.page-disclaimer .usage-body {
  padding: clamp(46px, 8vw, 88px) 0 clamp(56px, 9vw, 96px);
  background: var(--cloud);
  color: var(--usage-ink);
}

.page-disclaimer .usage-body__head {
  margin-bottom: clamp(26px, 4vw, 40px);
}

.page-disclaimer .usage-body .eyebrow {
  border-color: rgba(11, 27, 58, 0.14);
  background: rgba(11, 27, 58, 0.05);
  color: var(--flame);
}

.page-disclaimer .usage-body__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 4vw, 42px);
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: var(--navy);
}

.page-disclaimer .usage-toc {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0 0 clamp(30px, 4.6vw, 50px);
  padding: 0;
  list-style: none;
}

.page-disclaimer .usage-toc a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 46px;
  height: 46px;
  padding: 0 12px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--usage-rule);
  background: rgba(255, 255, 255, 0.76);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--navy);
  text-decoration: none;
  transition: transform 200ms var(--ease), border-color 200ms var(--ease),
    background-color 200ms var(--ease), color 200ms var(--ease);
}

.page-disclaimer .usage-toc a:hover,
.page-disclaimer .usage-toc a:focus-visible {
  transform: translateY(-3px);
  border-color: var(--flame);
  background: var(--flame);
  color: var(--navy);
}

.page-disclaimer .usage-item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  padding: clamp(26px, 4vw, 42px) 0;
  border-top: 1px solid var(--usage-rule);
  scroll-margin-top: calc(var(--header-offset) + 20px);
}

.page-disclaimer .usage-item:last-of-type {
  border-bottom: 1px solid var(--usage-rule);
}

.page-disclaimer .usage-item__side {
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.page-disclaimer .usage-item__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(28px, 3.6vw, 42px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--flame);
}

.page-disclaimer .usage-item__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(19px, 2.1vw, 24px);
  line-height: 1.32;
  letter-spacing: -0.01em;
  color: var(--navy);
}

.page-disclaimer .usage-item__body {
  max-width: 68ch;
}

.page-disclaimer .usage-item__body p {
  margin: 0 0 1.1em;
  font-size: 16.5px;
  line-height: 1.86;
  color: var(--usage-ink);
}

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

.page-disclaimer .usage-item__body a {
  color: var(--sky-deep);
  text-decoration: none;
  border-bottom: 1px solid rgba(17, 112, 196, 0.34);
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

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

.page-disclaimer .usage-item__body a.usage-mail {
  padding: 2px 7px;
  border: 0;
  border-radius: 7px;
  background: rgba(30, 155, 255, 0.12);
  font-family: var(--font-mono);
  font-size: 0.94em;
  color: var(--navy);
  transition: background-color 180ms var(--ease), color 180ms var(--ease);
}

.page-disclaimer .usage-item__body a.usage-mail:hover,
.page-disclaimer .usage-item__body a.usage-mail:focus-visible {
  background: var(--flame);
  color: var(--navy);
}

/* ============ 常见情形 ============ */
.page-disclaimer .usage-scenes {
  padding: clamp(44px, 7vw, 80px) 0 clamp(50px, 8vw, 92px);
  background: linear-gradient(180deg, var(--navy) 0%, var(--indigo) 100%);
  color: var(--cloud);
}

.page-disclaimer .usage-scenes__title {
  margin: 0 0 clamp(24px, 3.6vw, 38px);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.2vw, 36px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--cloud);
}

.page-disclaimer .usage-scenes__list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-disclaimer .usage-scene {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px 20px;
  border-radius: var(--radius-card);
  border: 1px solid var(--glass-line);
  background: var(--glass);
  transition: transform 220ms var(--ease), border-color 220ms var(--ease),
    background-color 220ms var(--ease);
}

.page-disclaimer .usage-scene:hover {
  transform: translateY(-4px);
  border-color: var(--flame);
  background: var(--glass-strong);
}

.page-disclaimer .usage-scene__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  border-radius: 13px;
  border: 1px solid rgba(255, 90, 31, 0.36);
  background: rgba(255, 90, 31, 0.16);
  color: var(--flame-soft);
}

.page-disclaimer .usage-scene__icon svg {
  width: 26px;
  height: 26px;
}

.page-disclaimer .usage-scene__label {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: -0.005em;
  color: var(--cloud);
}

.page-disclaimer .usage-scene__hint {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(247, 244, 239, 0.72);
  opacity: 1;
}

/* ============ 显现 ============ */
.page-disclaimer [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 620ms var(--ease), transform 620ms var(--ease);
}

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

/* ============ 响应式 ============ */
@media (min-width: 640px) {
  .page-disclaimer .usage-scenes__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
}

@media (min-width: 880px) {
  .page-disclaimer .usage-item {
    grid-template-columns: minmax(150px, 208px) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 72px);
    align-items: start;
  }

  .page-disclaimer .usage-item__side {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .page-disclaimer .usage-item__body p {
    font-size: 17px;
  }

  .page-disclaimer .usage-scenes__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (hover: hover) and (min-width: 900px) {
  .page-disclaimer .usage-scene__hint {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: opacity 220ms var(--ease), max-height 240ms var(--ease);
  }

  .page-disclaimer .usage-scene:hover .usage-scene__hint {
    max-height: 96px;
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-disclaimer *,
  .page-disclaimer *::before,
  .page-disclaimer *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }

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