.page-disclaimer {
  background: var(--c-paper);
  color: var(--c-ink);
}

/* ---------- 页首 ---------- */
.page-disclaimer .usage-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--hdr-h) + 22px) 0 40px;
  background:
    radial-gradient(120% 80% at 92% 0%, rgba(30, 144, 255, 0.09), transparent 62%),
    var(--c-paper);
}

.page-disclaimer .usage-hero::before {
  content: "";
  position: absolute;
  top: 24%;
  right: -6%;
  width: 56%;
  height: 150px;
  background: linear-gradient(90deg, var(--c-orange) 0 68%, var(--c-orange-deep) 68% 100%);
  transform: skewY(-8deg);
  opacity: 0.14;
  pointer-events: none;
}

.page-disclaimer .usage-hero__band {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 10px;
  background: linear-gradient(90deg, var(--c-orange) 0 62%, var(--c-blue) 62% 100%);
  clip-path: polygon(0 0, 100% 14%, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-disclaimer .usage-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  align-items: end;
}

.page-disclaimer .usage-hero h1 {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(40px, 9vw, 84px);
  line-height: 0.98;
  letter-spacing: 0.04em;
}

.page-disclaimer .usage-hero__lede {
  margin: 18px 0 0;
  max-width: 46ch;
  padding-left: 14px;
  border-left: 4px solid var(--c-orange);
  font-size: 16px;
  line-height: 1.72;
}

.page-disclaimer .usage-hero__figure {
  margin: 0;
  border: 1px solid var(--c-ink);
  border-radius: var(--r);
  box-shadow: 9px 9px 0 var(--c-orange);
  overflow: hidden;
  background: var(--c-sand-light);
}

.page-disclaimer .usage-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.06);
}

/* ---------- 主布局 ---------- */
.page-disclaimer .usage-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
  padding: 36px 0 64px;
}

/* ---------- 左侧索引 ---------- */
.page-disclaimer .usage-index ol {
  list-style: none;
  margin: 10px 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-disclaimer .usage-index a {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 8px 10px;
  border-left: 2px solid var(--c-sand-light);
  color: var(--c-ink);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.4;
  transition: background 180ms var(--ease), border-color 180ms var(--ease);
}

.page-disclaimer .usage-index a:hover {
  background: var(--c-sand-light);
  border-left-color: var(--c-orange);
}

.page-disclaimer .usage-index__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--c-stone);
}

/* ---------- 正文区块 ---------- */
.page-disclaimer .usage-body {
  min-width: 0;
}

.page-disclaimer .usage-sec {
  padding-bottom: 30px;
  margin-bottom: 30px;
  border-bottom: 1px solid var(--c-sand-light);
}

.page-disclaimer .usage-sec:last-child {
  padding-bottom: 0;
  margin-bottom: 0;
  border-bottom: 0;
}

.page-disclaimer .usage-sec h2 {
  display: flex;
  gap: 12px;
  align-items: baseline;
  margin: 0 0 16px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(22px, 3.4vw, 30px);
  line-height: 1.24;
  letter-spacing: 0.05em;
}

.page-disclaimer .usage-sec__num {
  flex: none;
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--c-orange);
}

.page-disclaimer .usage-sec p {
  margin: 0 0 14px;
  max-width: 64ch;
  font-size: 15.5px;
  line-height: 1.75;
}

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

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

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

.page-disclaimer .usage-list li {
  position: relative;
  padding: 10px 14px 10px 30px;
  border: 1px solid var(--c-sand);
  border-radius: var(--r);
  background: rgba(233, 220, 198, 0.34);
  font-size: 15px;
  line-height: 1.62;
}

.page-disclaimer .usage-list li::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 17px;
  width: 6px;
  height: 6px;
  background: var(--c-orange);
}

/* ---------- 引用格式示例 ---------- */
.page-disclaimer .usage-cite {
  margin: 0 0 16px;
  padding: 14px 16px 16px;
  border: 1px solid var(--c-ink);
  border-radius: var(--r);
  background: var(--c-sand-light);
  box-shadow: 6px 6px 0 var(--c-sand);
}

.page-disclaimer .usage-cite__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--c-orange-deep);
}

.page-disclaimer .usage-cite pre {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.85;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--c-ink);
}

/* ---------- 对比带 ---------- */
.page-disclaimer .usage-permit {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  margin: 6px 0 16px;
}

.page-disclaimer .usage-permit__col {
  border: 1px solid var(--c-ink);
  border-radius: var(--r);
  background: var(--c-paper);
  box-shadow: 8px 8px 0 var(--c-sand-light);
  overflow: hidden;
}

.page-disclaimer .usage-permit__col--ask {
  box-shadow: 8px 8px 0 var(--c-blue-soft);
}

.page-disclaimer .usage-permit__head {
  margin: 0;
  padding: 11px 16px;
  border-bottom: 1px solid var(--c-ink);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--c-ink);
}

.page-disclaimer .usage-permit__col--ok .usage-permit__head {
  background: var(--c-orange);
}

.page-disclaimer .usage-permit__col--ask .usage-permit__head {
  background: var(--c-blue);
}

.page-disclaimer .usage-permit ul {
  list-style: none;
  margin: 0;
  padding: 14px 16px 16px;
  display: grid;
  gap: 10px;
}

.page-disclaimer .usage-permit li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.6;
}

.page-disclaimer .usage-permit li::before {
  content: "—";
  position: absolute;
  left: 0;
  font-family: var(--font-mono);
  color: var(--c-stone);
}

/* ---------- 折叠与注释 ---------- */
.page-disclaimer .usage-details {
  margin: 18px 0 0;
  border: 1px solid var(--c-sand);
  border-radius: var(--r);
  background: rgba(247, 242, 232, 0.72);
}

.page-disclaimer .usage-details summary {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 13px 16px;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

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

.page-disclaimer .usage-details summary::before {
  content: "+";
  width: 14px;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--c-orange);
}

.page-disclaimer .usage-details[open] summary::before {
  content: "−";
}

.page-disclaimer .usage-details__panel {
  padding: 14px 16px 4px;
  border-top: 1px solid var(--c-sand-light);
}

.page-disclaimer .usage-details__panel .usage-list {
  margin-bottom: 12px;
}

.page-disclaimer .usage-note {
  margin: 16px 0 0;
  padding: 12px 14px;
  border-left: 4px solid var(--c-moss);
  background: rgba(92, 107, 74, 0.09);
  font-size: 14px;
  line-height: 1.68;
}

/* ---------- 联络信息 ---------- */
.page-disclaimer .usage-contact {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 18px;
}

.page-disclaimer .usage-contact__item {
  padding: 14px 16px;
  border: 1px solid var(--c-ink);
  border-radius: var(--r);
  background: var(--c-paper);
  box-shadow: 5px 5px 0 var(--c-sand-light);
}

.page-disclaimer .usage-contact__k {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--c-stone);
}

.page-disclaimer .usage-contact__v {
  font-size: 15px;
  line-height: 1.5;
  word-break: break-word;
}

/* ---------- 焦点态 ---------- */
.page-disclaimer a:focus-visible,
.page-disclaimer summary:focus-visible {
  outline: 2px solid var(--c-orange);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px var(--c-blue-soft);
}

/* ---------- 桌面布局 ---------- */
@media (min-width: 900px) {
  .page-disclaimer .usage-hero {
    padding: calc(var(--hdr-h) + 44px) 0 56px;
  }

  .page-disclaimer .usage-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 52px;
  }

  .page-disclaimer .usage-hero__figure {
    transform: translateY(-14px);
  }

  .page-disclaimer .usage-layout {
    grid-template-columns: 236px minmax(0, 1fr);
    gap: 60px;
    padding: 60px 0 96px;
  }

  .page-disclaimer .usage-index {
    position: sticky;
    top: calc(var(--hdr-h) + 28px);
    align-self: start;
  }

  .page-disclaimer .usage-permit {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 26px;
  }

  .page-disclaimer .usage-contact {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }
}

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

  .page-disclaimer .usage-hero__figure {
    transform: none;
  }
}