.page-disclaimer {
  --dsc-measure: 62ch;
  background: var(--paper);
  color: var(--ink);
}

/* ---------- hero ---------- */
.page-disclaimer .usage-hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(110% 85% at 88% -18%, rgba(53, 224, 200, 0.18) 0%, rgba(53, 224, 200, 0) 62%),
    linear-gradient(160deg, var(--ink) 0%, var(--ink-2) 100%);
  color: var(--ice);
  padding: calc(var(--bar-h) + clamp(22px, 4vw, 52px)) 0 0;
}

.page-disclaimer .usage-hero .breadcrumbs ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  font-size: var(--t--1);
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
  color: rgba(191, 215, 232, 0.65);
}

.page-disclaimer .usage-hero .breadcrumbs a {
  color: var(--ice);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
}

.page-disclaimer .usage-hero .breadcrumbs a:hover {
  border-bottom-color: var(--cyan);
}

.page-disclaimer .usage-hero .breadcrumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: rgba(191, 215, 232, 0.4);
}

.page-disclaimer .usage-hero .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--t--1);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-disclaimer .usage-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 48px);
  margin-top: clamp(22px, 4.5vw, 56px);
}

.page-disclaimer .usage-hero__title {
  margin: 0.55em 0 0;
  font-size: clamp(1.85rem, 5vw, 3.35rem);
  font-weight: 300;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: #ffffff;
  max-width: 20ch;
}

.page-disclaimer .usage-hero__lead {
  margin: clamp(16px, 2.4vw, 26px) 0 0;
  max-width: 48ch;
  font-size: var(--t-1);
  line-height: 1.8;
  color: rgba(191, 215, 232, 0.9);
}

.page-disclaimer .usage-stamp {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: clamp(18px, 3vw, 26px);
  border: 1px solid var(--line-inv);
  border-radius: var(--radius);
  background: rgba(18, 49, 79, 0.55);
}

.page-disclaimer .usage-stamp__v {
  font-family: var(--font-mono);
  font-size: clamp(2rem, 6vw, 2.9rem);
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-disclaimer .usage-stamp__label {
  font-size: var(--t--1);
  letter-spacing: 0.08em;
  color: rgba(191, 215, 232, 0.85);
}

.page-disclaimer .usage-stamp__meta {
  font-family: var(--font-mono);
  font-size: var(--t--1);
  letter-spacing: 0.03em;
  color: rgba(191, 215, 232, 0.62);
}

.page-disclaimer .usage-hero__figure {
  margin: clamp(28px, 5vw, 56px) 0 0;
  border-top: 1px solid var(--line-inv);
}

.page-disclaimer .usage-hero__figure img {
  display: block;
  width: 100%;
  height: clamp(140px, 24vw, 260px);
  object-fit: cover;
  opacity: 0.86;
}

/* ---------- 目录 ---------- */
.page-disclaimer .usage-toc {
  background: var(--ripple);
  border-bottom: 1px solid var(--line);
  padding: clamp(24px, 4vw, 42px) 0;
}

.page-disclaimer .usage-toc .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--t--1);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--slate);
}

.page-disclaimer .usage-toc__list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  border-top: 1px solid var(--line-strong);
}

.page-disclaimer .usage-toc__link {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 2px;
  border-bottom: 1px solid var(--line);
  color: var(--ink);
  text-decoration: none;
  font-size: var(--t-0);
  line-height: 1.6;
  transition: color 0.2s ease, background 0.2s ease;
}

.page-disclaimer .usage-toc__link:hover,
.page-disclaimer .usage-toc__link:focus-visible {
  color: #0f7f70;
  background: rgba(53, 224, 200, 0.1);
}

.page-disclaimer .usage-toc__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: var(--t--1);
  letter-spacing: 0.08em;
  color: var(--slate);
}

/* ---------- 章节 ---------- */
.page-disclaimer .usage-block {
  padding: clamp(44px, 7vw, 88px) 0;
  border-top: 1px solid var(--line);
}

.page-disclaimer .usage-block--tint {
  background: linear-gradient(180deg, var(--ripple) 0%, var(--paper) 92%);
}

.page-disclaimer .usage-block__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3.6vw, 44px);
}

.page-disclaimer .usage-block__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2.8rem, 8vw, 5rem);
  line-height: 0.9;
  letter-spacing: 0.02em;
  color: rgba(10, 27, 46, 0.16);
}

.page-disclaimer .usage-block__title {
  margin: 0.55em 0 0;
  font-size: clamp(1.3rem, 3vw, 1.95rem);
  font-weight: 300;
  line-height: 1.4;
  letter-spacing: -0.02em;
  color: var(--ink);
  max-width: 22ch;
}

.page-disclaimer .usage-block__body {
  max-width: var(--dsc-measure);
}

.page-disclaimer .usage-block__lead {
  margin: 0 0 clamp(20px, 3vw, 30px);
  font-size: var(--t-0);
  line-height: 1.8;
  color: rgba(10, 27, 46, 0.82);
  max-width: 54ch;
}

/* ---------- 坐标写法卡 ---------- */
.page-disclaimer .usage-specimen {
  margin: 0 0 clamp(22px, 3.4vw, 32px);
  padding: clamp(18px, 3vw, 26px);
  border-radius: var(--radius);
  background: linear-gradient(150deg, var(--ink) 0%, var(--ink-2) 100%);
  color: var(--ice);
}

.page-disclaimer .usage-specimen__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--t--1);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-disclaimer .usage-specimen__code {
  margin: 0.55em 0 0.35em;
  font-family: var(--font-mono);
  font-size: clamp(1.25rem, 3.4vw, 1.85rem);
  letter-spacing: 0.06em;
  color: #ffffff;
  word-break: break-word;
}

.page-disclaimer .usage-specimen__note {
  margin: 0;
  font-size: var(--t--1);
  line-height: 1.7;
  color: rgba(191, 215, 232, 0.78);
}

/* ---------- 条目清单 ---------- */
.page-disclaimer .usage-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: clamp(16px, 2.4vw, 24px);
}

.page-disclaimer .usage-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 14px;
  padding: 2px 0;
}

.page-disclaimer .usage-item__num {
  font-family: var(--font-mono);
  font-size: var(--t--1);
  letter-spacing: 0.06em;
  color: var(--slate);
  padding-top: 0.42em;
}

.page-disclaimer .usage-item p {
  margin: 0;
  font-size: var(--t-0);
  line-height: 1.78;
  color: rgba(10, 27, 46, 0.88);
}

.page-disclaimer .usage-item p a {
  color: #0f7f70;
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-disclaimer .usage-item p a:hover {
  color: var(--ink);
}

.page-disclaimer .usage-item--key {
  border-left: 3px solid var(--cyan);
  border-radius: 0 12px 12px 0;
  padding: 12px 14px 12px clamp(12px, 2vw, 20px);
  background: linear-gradient(90deg, rgba(53, 224, 200, 0.14) 0%, rgba(53, 224, 200, 0) 72%);
}

/* ---------- 尾块 ---------- */
.page-disclaimer .usage-cta {
  padding: clamp(44px, 7vw, 88px) 0;
}

.page-disclaimer .usage-cta .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--t--1);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-disclaimer .usage-cta__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 40px);
}

.page-disclaimer .usage-cta__title {
  margin: 0.6em 0 0;
  font-size: clamp(1.45rem, 3.6vw, 2.3rem);
  font-weight: 300;
  line-height: 1.35;
  letter-spacing: -0.02em;
  color: #ffffff;
  max-width: 22ch;
}

.page-disclaimer .usage-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 28px);
}

.page-disclaimer .usage-cta__contact {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--t--1);
  line-height: 2;
  letter-spacing: 0.03em;
  color: rgba(191, 215, 232, 0.82);
  word-break: break-word;
}

/* ---------- 断点 ---------- */
@media (min-width: 760px) {
  .page-disclaimer .usage-toc__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(20px, 4vw, 48px);
  }
}

@media (min-width: 900px) {
  .page-disclaimer .usage-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: end;
  }

  .page-disclaimer .usage-cta__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }
}

@media (min-width: 960px) {
  .page-disclaimer .usage-block__inner {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    align-items: start;
  }

  .page-disclaimer .usage-block__side {
    position: sticky;
    top: clamp(20px, 3vw, 40px);
  }
}

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