.page-disclaimer {
  background: var(--paper);
  color: var(--ink);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-disclaimer .usage-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: linear-gradient(152deg, var(--night) 0%, var(--navy) 62%, #0d2c52 100%);
  color: var(--paper);
  padding: clamp(24px, 5vw, 44px) 0 clamp(32px, 6vw, 62px);
}

.page-disclaimer .usage-hero::before {
  content: "";
  position: absolute;
  inset: -25% -10% -25% -10%;
  z-index: -1;
  pointer-events: none;
  background-image: repeating-linear-gradient(115deg, rgba(201, 206, 216, .10) 0 1px, transparent 1px 16px);
  transform: rotate(-2deg);
}

.page-disclaimer .usage-hero::after {
  content: "";
  position: absolute;
  right: -70px;
  bottom: -100px;
  width: 230px;
  height: 230px;
  z-index: -1;
  pointer-events: none;
  border-radius: 42% 58% 60% 40% / 48% 42% 58% 52%;
  background: var(--orange);
  opacity: .16;
}

.page-disclaimer .usage-hero-grid {
  display: grid;
  gap: clamp(24px, 5vw, 42px);
  align-items: end;
}

.page-disclaimer .usage-hero .breadcrumb-link {
  color: rgba(245, 246, 248, .72);
}

.page-disclaimer .usage-hero .breadcrumb-link[aria-current="page"] {
  color: var(--lime);
}

.page-disclaimer .usage-hero .section-label {
  color: var(--lime);
  margin-top: clamp(18px, 4vw, 30px);
}

.page-disclaimer .usage-hero h1 {
  margin: .28em 0 .42em;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.4rem, 7.5vw, 4.2rem);
  line-height: 1.04;
  letter-spacing: -.02em;
  color: #FFFFFF;
}

.page-disclaimer .usage-lede {
  margin: 0;
  max-width: 46ch;
  font-size: clamp(1rem, 2.4vw, 1.1rem);
  line-height: 1.85;
  color: rgba(245, 246, 248, .8);
}

.page-disclaimer .usage-hero-meta {
  list-style: none;
  margin: clamp(22px, 4vw, 34px) 0 0;
  padding: 16px 0 0;
  border-top: 1px solid var(--line-dark);
  display: grid;
  gap: 10px;
}

.page-disclaimer .usage-hero-meta li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 12px;
  font-size: .88rem;
  color: rgba(245, 246, 248, .7);
}

.page-disclaimer .usage-hero-meta .mono {
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .07em;
  color: var(--lime);
}

.page-disclaimer .usage-hero-figure {
  margin: 0;
}

.page-disclaimer .usage-hero-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
  object-fit: cover;
}

.page-disclaimer .usage-hero-figure .media-frame-caption {
  color: rgba(245, 246, 248, .6);
}

/* ---------- 正文骨架 ---------- */
.page-disclaimer .usage-body {
  padding: clamp(30px, 6vw, 66px) 0 clamp(46px, 8vw, 90px);
}

.page-disclaimer .usage-grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-disclaimer .usage-toc {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: #FFFFFF;
}

.page-disclaimer .usage-toc .chapter-toc-title {
  width: 100%;
  margin: 0;
}

.page-disclaimer .usage-toc .chapter-link {
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .04em;
  padding: 7px 9px;
  border-radius: 6px;
}

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

.page-disclaimer .usage-section {
  padding: clamp(26px, 4vw, 42px) 0;
  border-top: 1px solid var(--line);
}

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

.page-disclaimer .usage-section h2 {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0 0 .72em;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.32rem, 3vw, 1.82rem);
  line-height: 1.26;
  letter-spacing: -.01em;
}

.page-disclaimer .usage-num {
  flex: none;
  transform: translateY(-2px);
  padding: 4px 9px;
  border: 1px solid rgba(255, 107, 26, .42);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: .76rem;
  line-height: 1;
  letter-spacing: .12em;
  color: var(--orange);
}

.page-disclaimer .usage-section p {
  margin: 0 0 1em;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--ink);
  overflow-wrap: break-word;
}

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

.page-disclaimer .usage-article a {
  color: var(--blue);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-disclaimer .usage-article a:hover {
  color: var(--orange);
}

/* ---------- 条款列表 ---------- */
.page-disclaimer .usage-list {
  counter-reset: usage-item;
  list-style: none;
  margin: 0 0 1.2em;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-disclaimer .usage-list li {
  position: relative;
  padding: 15px 0 15px 2.9rem;
  border-bottom: 1px solid var(--line);
  font-size: .96rem;
  line-height: 1.8;
  color: var(--ink);
  overflow-wrap: break-word;
}

.page-disclaimer .usage-list li::before {
  counter-increment: usage-item;
  content: counter(usage-item, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 17px;
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .06em;
  color: var(--blue);
}

.page-disclaimer .usage-list li strong {
  font-weight: 700;
}

.page-disclaimer .usage-list--warn li::before {
  color: var(--red);
}

/* ---------- 折叠条目 ---------- */
.page-disclaimer .usage-fold {
  margin-top: 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: #FFFFFF;
  overflow: hidden;
}

.page-disclaimer .usage-fold + .usage-fold {
  margin-top: 8px;
}

.page-disclaimer .usage-fold > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 13px 16px;
  cursor: pointer;
  list-style: none;
  font-size: .95rem;
  font-weight: 600;
  color: var(--ink);
}

.page-disclaimer .usage-fold > summary::-webkit-details-marker {
  display: none;
}

.page-disclaimer .usage-fold > summary::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  line-height: 1;
  color: var(--orange);
}

.page-disclaimer .usage-fold[open] > summary::after {
  content: "−";
}

.page-disclaimer .usage-fold > p {
  margin: 0;
  padding: 0 16px 15px;
  font-size: .92rem;
  line-height: 1.8;
  color: var(--ink);
}

/* ---------- 联系区块 ---------- */
.page-disclaimer .usage-contact {
  position: relative;
  overflow: hidden;
  margin-top: 18px;
  padding: clamp(20px, 4vw, 34px);
  border-radius: var(--radius-lg);
  background: var(--night);
  color: var(--paper);
}

.page-disclaimer .usage-contact::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 4px;
  height: 100%;
  background: var(--orange);
}

.page-disclaimer .usage-contact .contact-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 14px;
  padding: 4px 0 16px;
  border-bottom: 1px solid var(--line-dark);
}

.page-disclaimer .usage-contact .contact-label {
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .1em;
  color: rgba(245, 246, 248, .6);
}

.page-disclaimer .usage-contact .contact-value {
  font-family: var(--font-mono);
  font-size: .95rem;
  color: #FFFFFF;
  word-break: break-all;
}

.page-disclaimer .usage-contact-more {
  margin: 16px 0 0;
  font-size: .92rem;
  line-height: 1.8;
  color: rgba(245, 246, 248, .76);
}

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

/* ---------- 桌面布局 ---------- */
@media (min-width: 900px) {
  .page-disclaimer .usage-hero-grid {
    grid-template-columns: minmax(0, 1.32fr) minmax(0, .68fr);
  }

  .page-disclaimer .usage-hero-meta {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
  }

  .page-disclaimer .usage-hero-meta li {
    flex-direction: column;
    gap: 6px;
  }
}

@media (min-width: 980px) {
  .page-disclaimer .usage-grid {
    grid-template-columns: 236px minmax(0, 1fr);
    align-items: start;
  }

  .page-disclaimer .usage-toc {
    position: sticky;
    top: 104px;
    flex-direction: column;
    flex-wrap: nowrap;
    align-self: start;
  }

  .page-disclaimer .usage-toc .chapter-link {
    width: 100%;
  }
}

/* ---------- 打印 ---------- */
@media print {
  .page-disclaimer {
    background: #FFFFFF;
  }

  .page-disclaimer .usage-hero {
    background: none;
    color: #000000;
    padding: 0 0 14px;
  }

  .page-disclaimer .usage-hero::before,
  .page-disclaimer .usage-hero::after {
    display: none;
  }

  .page-disclaimer .usage-hero h1,
  .page-disclaimer .usage-hero .breadcrumb-link {
    color: #000000;
  }

  .page-disclaimer .usage-lede,
  .page-disclaimer .usage-hero-meta li {
    color: #222222;
  }

  .page-disclaimer .usage-hero-figure,
  .page-disclaimer .usage-toc,
  .page-disclaimer .to-top {
    display: none;
  }

  .page-disclaimer .usage-section {
    break-inside: avoid;
    page-break-inside: avoid;
  }
}