.page-disclaimer {
  --usage-rule: rgba(169, 180, 196, .18);
  --usage-rule-strong: rgba(169, 180, 196, .34);
  display: block;
  color: var(--paper-100);
  background: var(--ink-950);
  overflow-x: clip;
}

.page-disclaimer .usage-sr {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* ---------- 首屏 ---------- */
.page-disclaimer .usage-hero {
  position: relative;
  padding: clamp(22px, 4.4vw, 40px) 0 clamp(32px, 6vw, 62px);
  background:
    radial-gradient(110% 70% at 84% 2%, rgba(232, 163, 61, .18), transparent 62%),
    radial-gradient(90% 60% at 2% 98%, rgba(46, 196, 182, .08), transparent 60%),
    linear-gradient(180deg, var(--ink-950) 0%, var(--ink-900) 100%);
  border-bottom: 1px solid var(--usage-rule);
}

.page-disclaimer .breadcrumb {
  margin-bottom: 8px;
}

.page-disclaimer .hero-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 4vw, 44px);
  margin-top: clamp(16px, 3vw, 28px);
}

.page-disclaimer .hero-copy {
  min-width: 0;
}

.page-disclaimer .usage-title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(28px, 5.4vw, 50px);
  line-height: 1.2;
  letter-spacing: .01em;
  color: var(--paper-100);
  text-wrap: balance;
}

.page-disclaimer .usage-lede {
  margin: 16px 0 0;
  max-width: 56ch;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.85;
  color: var(--slate-300);
}

.page-disclaimer .hero-figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--usage-rule-strong);
  background: var(--ink-800);
  box-shadow: var(--shadow-float);
}

.page-disclaimer .hero-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-disclaimer .hero-figure figcaption {
  padding: 10px 14px 12px;
  border-top: 1px solid var(--usage-rule);
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--slate-300);
}

/* ---------- 版本切换 ---------- */
.page-disclaimer .version-switch {
  position: relative;
  margin-top: clamp(20px, 3vw, 28px);
}

.page-disclaimer .version-switch > input {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.page-disclaimer .version-tabs {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 5px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--usage-rule-strong);
  background: rgba(11, 18, 32, .65);
}

.page-disclaimer .version-tabs label {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 16px;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .02em;
  color: var(--slate-300);
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-disclaimer #usage-v3:checked ~ .version-tabs label[for="usage-v3"],
.page-disclaimer #usage-v2:checked ~ .version-tabs label[for="usage-v2"] {
  color: var(--amber-500);
  border-color: var(--amber-500);
  background: rgba(232, 163, 61, .1);
}

.page-disclaimer #usage-v3:focus-visible ~ .version-tabs label[for="usage-v3"],
.page-disclaimer #usage-v2:focus-visible ~ .version-tabs label[for="usage-v2"] {
  outline: 2px solid var(--amber-200);
  outline-offset: 2px;
}

.page-disclaimer .version-panels {
  margin-top: 12px;
  padding: 12px 14px;
  min-height: 70px;
  border-left: 2px solid var(--amber-500);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: rgba(22, 36, 61, .5);
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--slate-300);
}

.page-disclaimer .version-panel {
  margin: 0;
  display: none;
}

.page-disclaimer #usage-v3:checked ~ .version-panels .version-panel--v3 {
  display: block;
}

.page-disclaimer #usage-v2:checked ~ .version-panels .version-panel--v2 {
  display: block;
}

/* ---------- 条款主体 ---------- */
.page-disclaimer .usage-body {
  padding: clamp(30px, 5vw, 58px) 0 clamp(38px, 6vw, 70px);
  background: linear-gradient(180deg, var(--ink-900) 0%, var(--ink-950) 58%, var(--ink-900) 100%);
}

.page-disclaimer .usage-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 3vw, 30px);
}

.page-disclaimer .usage-toc {
  min-width: 0;
}

.page-disclaimer .toc-heading {
  display: none;
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--slate-300);
}

.page-disclaimer .toc-inner {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 2px 2px 8px;
  scrollbar-width: thin;
  scroll-snap-type: x proximity;
}

.page-disclaimer .toc-link {
  flex: 0 0 auto;
  scroll-snap-align: start;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 14px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--usage-rule);
  background: rgba(22, 36, 61, .55);
  color: var(--slate-300);
  font-family: var(--font-mono);
  font-size: 12.5px;
  text-decoration: none;
  white-space: nowrap;
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-disclaimer .toc-link:hover,
.page-disclaimer .toc-link:focus-visible {
  color: var(--amber-200);
  border-color: var(--amber-500);
  background: rgba(232, 163, 61, .12);
}

.page-disclaimer .usage-clauses {
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-width: 0;
}

.page-disclaimer .clause {
  background: var(--paper-100);
  color: var(--ink-deep);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(11, 18, 32, .1);
  box-shadow: 0 12px 28px rgba(0, 0, 0, .22);
  overflow: hidden;
  scroll-margin-top: 100px;
}

.page-disclaimer .clause-head {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 60px;
  padding: 14px 16px;
  list-style: none;
  cursor: pointer;
}

.page-disclaimer .clause-head::-webkit-details-marker {
  display: none;
}

.page-disclaimer .clause-no {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 54px;
  height: 26px;
  padding: 0 8px;
  border-radius: 8px;
  background: var(--ink-950);
  color: var(--amber-200);
  font-size: 12px;
  letter-spacing: .04em;
}

.page-disclaimer .clause-title {
  flex: 1 1 auto;
  min-width: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(16px, 2.2vw, 19px);
  line-height: 1.4;
  color: var(--ink-950);
}

.page-disclaimer .clause-mark {
  flex: 0 0 auto;
  width: 10px;
  height: 10px;
  border-right: 2px solid var(--ink-muted);
  border-bottom: 2px solid var(--ink-muted);
  transform: rotate(45deg) translate(-2px, -2px);
  transition: transform .22s var(--ease);
}

.page-disclaimer .clause[open] .clause-mark {
  transform: rotate(-135deg) translate(-2px, -2px);
}

.page-disclaimer .clause-body {
  margin: 0 16px 18px;
  padding-top: 14px;
  border-top: 1px dashed rgba(11, 18, 32, .16);
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-deep);
}

.page-disclaimer .clause-body p {
  margin: 0 0 12px;
}

.page-disclaimer .clause-body p:last-child {
  margin-bottom: 0;
}

.page-disclaimer .clause-body a {
  color: var(--amber-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-disclaimer .clause-body a:hover,
.page-disclaimer .clause-body a:focus-visible {
  color: var(--coral-500);
}

/* ---------- 分号对照 ---------- */
.page-disclaimer .semicolon-pair {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: 16px 0;
  padding: 14px;
  border-radius: var(--radius-md);
  background: rgba(232, 163, 61, .14);
  border: 1px solid rgba(232, 163, 61, .34);
}

.page-disclaimer .pair-label {
  margin: 0 0 6px;
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--amber-deep);
}

.page-disclaimer .pair-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--ink-deep);
}

.page-disclaimer .pair-mark {
  display: none;
  align-self: center;
  font-family: var(--font-mono);
  font-size: 34px;
  line-height: 1;
  color: var(--coral-500);
  text-align: center;
}

/* ---------- 便签 ---------- */
.page-disclaimer .usage-note {
  min-width: 0;
}

.page-disclaimer .note-card {
  border-radius: var(--radius-md);
  background: var(--amber-200);
  color: var(--ink-950);
  border: 1px solid rgba(11, 18, 32, .12);
  box-shadow: var(--shadow-float);
  transform: rotate(-.6deg);
}

.page-disclaimer .note-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 44px;
  padding: 10px 14px;
  list-style: none;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--ink-950);
}

.page-disclaimer .note-head::-webkit-details-marker {
  display: none;
}

.page-disclaimer .note-head::after {
  content: "−";
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--ink-950);
}

.page-disclaimer .note-card:not([open]) .note-head::after {
  content: "+";
}

.page-disclaimer .note-list {
  margin: 0;
  padding: 0 14px 14px 30px;
  font-size: 13px;
  line-height: 1.75;
  color: var(--ink-950);
}

.page-disclaimer .note-list li {
  margin-bottom: 8px;
}

.page-disclaimer .note-list li:last-child {
  margin-bottom: 0;
}

.page-disclaimer .note-list li::marker {
  color: var(--coral-500);
}

/* ---------- 联系 ---------- */
.page-disclaimer .usage-contact {
  padding: clamp(32px, 5vw, 62px) 0 clamp(38px, 6vw, 70px);
  background:
    radial-gradient(100% 80% at 90% 0%, rgba(242, 107, 78, .14), transparent 62%),
    var(--ink-900);
  border-top: 1px solid var(--usage-rule);
  scroll-margin-top: 90px;
}

.page-disclaimer .contact-panel {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
  padding: clamp(20px, 3.4vw, 34px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--usage-rule-strong);
  background: linear-gradient(160deg, rgba(22, 36, 61, .92), rgba(11, 18, 32, .92));
  box-shadow: var(--shadow-float);
}

.page-disclaimer .contact-copy {
  min-width: 0;
}

.page-disclaimer .contact-title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.32;
  color: var(--paper-100);
}

.page-disclaimer .contact-text {
  margin: 14px 0 0;
  max-width: 48ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--slate-300);
}

.page-disclaimer .usage-contact-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-width: 0;
}

.page-disclaimer .usage-contact-item {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 12px 14px;
  border-radius: var(--radius-md);
  background: rgba(244, 239, 230, .06);
  border: 1px solid var(--usage-rule);
}

.page-disclaimer .usage-contact-label {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--amber-500);
}

.page-disclaimer .usage-contact-value {
  flex: 1 1 100%;
  order: 3;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--paper-100);
  word-break: break-word;
}

.page-disclaimer .copy-btn {
  min-height: 44px;
  padding: 0 14px;
  font-size: 12.5px;
}

.page-disclaimer .contact-more {
  margin: 16px 0 0;
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--slate-300);
}

.page-disclaimer .contact-more a {
  color: var(--amber-200);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-disclaimer .contact-more a:hover,
.page-disclaimer .contact-more a:focus-visible {
  color: var(--coral-500);
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-disclaimer .semicolon-pair {
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
    gap: 14px;
    align-items: stretch;
  }

  .page-disclaimer .pair-mark {
    display: block;
  }
}

@media (min-width: 860px) {
  .page-disclaimer .contact-panel {
    grid-template-columns: minmax(0, 1fr) minmax(0, .92fr);
    gap: 34px;
    align-items: start;
  }
}

@media (min-width: 960px) {
  .page-disclaimer .hero-split {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    align-items: center;
    gap: clamp(28px, 4vw, 52px);
  }

  .page-disclaimer .usage-grid {
    grid-template-columns: 190px minmax(0, 1fr) 236px;
    gap: 28px;
    align-items: start;
  }

  .page-disclaimer .toc-heading {
    display: block;
  }

  .page-disclaimer .toc-inner {
    flex-direction: column;
    gap: 6px;
    overflow: visible;
    padding: 0;
    position: sticky;
    top: 96px;
  }

  .page-disclaimer .toc-link {
    width: 100%;
    justify-content: flex-start;
    min-height: 40px;
    padding: 0 12px;
    border-color: transparent;
    border-radius: var(--radius-sm);
    background: transparent;
    white-space: normal;
    text-align: left;
  }

  .page-disclaimer .toc-link:hover,
  .page-disclaimer .toc-link:focus-visible {
    background: rgba(232, 163, 61, .1);
    border-color: transparent;
  }

  .page-disclaimer .usage-note {
    position: sticky;
    top: 96px;
  }

  .page-disclaimer .clause-head {
    padding: 16px 22px;
  }

  .page-disclaimer .clause-body {
    margin: 0 22px 20px;
    font-size: 15.5px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-disclaimer * {
    transition: none !important;
    animation: none !important;
  }
}