.page-disclaimer {
  --usage-top: 92px;
  background: var(--ink);
  color: var(--paper);
}

.page-disclaimer .usage-hero {
  position: relative;
  overflow: hidden;
  padding: 44px 0 40px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(155deg, var(--grad-a) 0%, var(--grad-b) 82%);
}

.page-disclaimer .usage-hero__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.18;
  filter: grayscale(0.35) contrast(1.15);
}

.page-disclaimer .usage-hero__veil {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(77, 232, 176, 0.16) 0%, rgba(77, 232, 176, 0) 58%),
    linear-gradient(180deg, rgba(10, 20, 17, 0.42) 0%, rgba(6, 18, 15, 0.94) 100%);
}

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

.page-disclaimer .usage-hero .breadcrumb {
  margin-bottom: 20px;
}

.page-disclaimer .usage-hero h1 {
  margin: 12px 0 16px;
  max-width: 16em;
  font-size: clamp(29px, 6.2vw, 56px);
  line-height: 1.12;
  letter-spacing: -0.02em;
}

.page-disclaimer .usage-hero .lede {
  max-width: 34em;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.85;
}

.page-disclaimer .note-rotated {
  margin: 26px 0 0;
  color: var(--mint);
}

.page-disclaimer .usage-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  padding-top: 36px;
  padding-bottom: 24px;
}

/* ---------- 粘性摘要卡 ---------- */
.page-disclaimer .usage-index {
  align-self: start;
  min-width: 0;
}

.page-disclaimer .usage-index__card {
  position: relative;
  padding: 24px 20px 24px 26px;
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  background: var(--panel);
}

.page-disclaimer .usage-index__card::before {
  content: "";
  position: absolute;
  top: 24px;
  bottom: 24px;
  left: 10px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--mint-bright) 0%, rgba(77, 232, 176, 0.12) 100%);
}

.page-disclaimer .usage-index__card h2 {
  margin: 8px 0 0;
  font-size: 20px;
  line-height: 1.4;
}

.page-disclaimer .usage-index__list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-disclaimer .usage-index__list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 6px 10px 0;
  border-bottom: 1px solid rgba(42, 74, 64, 0.6);
  color: var(--paper);
  font-size: 14px;
  line-height: 1.5;
  text-decoration: none;
  transition: color var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}

.page-disclaimer .usage-index__list a .mono {
  flex: none;
  font-size: 12px;
  color: var(--mint);
}

.page-disclaimer .usage-index__list a:hover,
.page-disclaimer .usage-index__list a:focus-visible {
  color: var(--mint-bright);
  padding-left: 6px;
}

.page-disclaimer .usage-index__tip {
  margin-top: 18px;
  padding: 14px 16px;
  border: 1px solid rgba(255, 179, 71, 0.38);
  border-radius: var(--r-btn);
  background: rgba(255, 179, 71, 0.08);
}

.page-disclaimer .usage-index__tip p {
  margin: 10px 0 0;
  color: var(--paper);
  font-size: 13px;
  line-height: 1.7;
}

.page-disclaimer .usage-index__card .rule {
  margin: 18px 0 12px;
}

.page-disclaimer .usage-index__meta {
  margin: 0;
  font-size: 12px;
  line-height: 1.7;
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

/* ---------- 条目 ---------- */
.page-disclaimer .usage-body {
  min-width: 0;
}

.page-disclaimer .usage-sec {
  position: relative;
  padding: 26px 0 30px;
  border-top: 1px solid var(--line);
  scroll-margin-top: var(--usage-top);
}

.page-disclaimer .usage-sec::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 54px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--amber) 0%, rgba(255, 179, 71, 0) 100%);
}

.page-disclaimer .usage-sec__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 12px;
}

.page-disclaimer .usage-sec__no {
  flex: none;
  padding: 3px 9px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  color: var(--mint);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
}

.page-disclaimer .usage-sec h2 {
  margin: 0;
  font-size: clamp(20px, 3.4vw, 28px);
  line-height: 1.32;
}

.page-disclaimer .usage-sec p {
  margin: 0 0 12px;
  max-width: 42em;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.85;
}

.page-disclaimer .usage-sec p a {
  color: var(--mint);
  text-decoration: none;
  border-bottom: 1px solid rgba(77, 232, 176, 0.4);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-disclaimer .usage-sec p a:hover,
.page-disclaimer .usage-sec p a:focus-visible {
  color: var(--mint-bright);
  border-bottom-color: var(--mint-bright);
}

.page-disclaimer .usage-list {
  list-style: none;
  margin: 14px 0 16px;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-disclaimer .usage-list li {
  position: relative;
  padding-left: 20px;
  color: var(--paper);
  font-size: 15px;
  line-height: 1.75;
}

.page-disclaimer .usage-list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 0.66em;
  width: 7px;
  height: 7px;
  border-radius: 1px;
  background: var(--mint);
  transform: rotate(45deg);
}

/* ---------- 琥珀提示条 ---------- */
.page-disclaimer .usage-alert {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin: 16px 0 18px;
  padding: 14px 16px;
  border-left: 3px solid var(--amber);
  border-radius: var(--r-btn);
  background: rgba(255, 179, 71, 0.09);
}

.page-disclaimer .usage-alert__key {
  flex: none;
  margin-top: 3px;
  color: var(--amber);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
}

.page-disclaimer .usage-alert p {
  margin: 0;
  color: var(--paper);
  font-size: 14px;
  line-height: 1.75;
}

/* ---------- 引用示例 ---------- */
.page-disclaimer .usage-code {
  margin: 18px 0 6px;
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  overflow: hidden;
  background: var(--ink);
}

.page-disclaimer .usage-code__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--line);
  background: var(--panel);
}

.page-disclaimer .usage-code__body {
  margin: 0;
  padding: 16px 14px;
  overflow-x: auto;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.95;
  white-space: pre-wrap;
  word-break: break-word;
}

/* ---------- 联络信息 ---------- */
.page-disclaimer .usage-contact {
  margin: 16px 0 18px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  background: var(--panel-2);
  display: grid;
  gap: 12px;
}

.page-disclaimer .usage-contact__row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0;
}

.page-disclaimer .usage-contact__key {
  min-width: 76px;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.14em;
}

.page-disclaimer .usage-contact__row .mono {
  color: var(--mint-bright);
  font-size: 14px;
  word-break: break-all;
}

.page-disclaimer .usage-steps {
  list-style: none;
  counter-reset: none;
  margin: 12px 0 16px;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-disclaimer .usage-steps li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: var(--r-btn);
  color: var(--paper);
  font-size: 14px;
  line-height: 1.7;
}

.page-disclaimer .usage-steps__no {
  flex: none;
  width: 22px;
  height: 22px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  background: rgba(77, 232, 176, 0.14);
  color: var(--mint);
  font-family: var(--font-mono);
  font-size: 11px;
}

/* ---------- 延伸入口 ---------- */
.page-disclaimer .usage-tail {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
  padding: 26px 0 44px;
  border-top: 1px solid var(--line);
}

.page-disclaimer .usage-tail__link {
  display: inline-flex;
  align-items: center;
  padding: 9px 18px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  color: var(--paper);
  font-size: 14px;
  text-decoration: none;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-disclaimer .usage-tail__link:hover,
.page-disclaimer .usage-tail__link:focus-visible {
  border-color: var(--mint);
  color: var(--mint-bright);
  background: rgba(77, 232, 176, 0.08);
}

@media (prefers-reduced-motion: reduce) {
  .page-disclaimer .usage-index__list a,
  .page-disclaimer .usage-tail__link,
  .page-disclaimer .usage-sec p a {
    transition: none;
  }
  .page-disclaimer .usage-index__list a:hover,
  .page-disclaimer .usage-index__list a:focus-visible {
    padding-left: 0;
  }
}

@media (min-width: 720px) {
  .page-disclaimer .usage-hero {
    padding: 56px 0 52px;
  }
  .page-disclaimer .usage-sec {
    padding: 30px 0 34px;
  }
}

@media (min-width: 900px) {
  .page-disclaimer .usage-hero {
    padding: 70px 0 62px;
  }
  .page-disclaimer .usage-layout {
    grid-template-columns: 38fr 62fr;
    gap: 52px;
    padding-top: 52px;
    padding-bottom: 32px;
  }
  .page-disclaimer .usage-index__card {
    position: sticky;
    top: var(--usage-top);
    padding: 26px 22px 26px 28px;
  }
  .page-disclaimer .usage-sec {
    padding: 34px 0 38px;
  }
  .page-disclaimer .usage-sec__head {
    gap: 16px;
  }
  .page-disclaimer .usage-code__body {
    font-size: 13px;
  }
}