.page-disclaimer {
  --u-line: rgba(159, 179, 200, 0.18);
  --u-card: #0C2823;
  --u-track: rgba(47, 243, 208, 0.14);
  background:
    radial-gradient(760px 380px at 88% -6%, rgba(47, 243, 208, 0.12), transparent 72%),
    radial-gradient(620px 340px at 4% 12%, rgba(110, 31, 53, 0.22), transparent 76%),
    var(--bg-deep);
  color: var(--fog);
  font-family: var(--font-sans);
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-disclaimer .breadcrumb {
  padding-top: clamp(18px, 3vw, 28px);
}

/* ---------- 首屏 ---------- */
.page-disclaimer .usage-hero {
  display: grid;
  gap: 26px;
  margin-top: clamp(14px, 2.4vw, 22px);
}

.page-disclaimer .usage-hero__title {
  font-family: var(--font-serif);
  font-size: clamp(30px, 6.4vw, 52px);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 14px 0 0;
  color: var(--fog);
}

.page-disclaimer .usage-hero__lead {
  margin: 18px 0 0;
  max-width: 48ch;
  font-size: 16px;
  line-height: 1.82;
  color: var(--slate-soft);
}

.page-disclaimer .usage-hero__meta {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 22px 0 0;
  padding: 0;
}

.page-disclaimer .usage-hero__meta li {
  border: 1px solid var(--cyan-line);
  background: rgba(47, 243, 208, 0.06);
  border-radius: var(--r-pill);
  padding: 6px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--cyan-soft);
}

.page-disclaimer .usage-hero__figure {
  margin: 0;
  position: relative;
  overflow: hidden;
  border-radius: var(--r-xl);
  border: 1px solid var(--u-line);
  background: var(--bg-section);
  min-width: 0;
}

.page-disclaimer .usage-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-disclaimer .usage-hero__caption {
  position: absolute;
  left: 14px;
  bottom: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cyan-soft);
  background: rgba(6, 20, 18, 0.72);
  border: 1px solid var(--cyan-line);
  border-radius: var(--r-pill);
  padding: 4px 12px;
}

/* ---------- 筛选 ---------- */
.page-disclaimer .usage-toolbar {
  margin-top: clamp(26px, 4.5vw, 44px);
}

.page-disclaimer .usage-toolbar .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-disclaimer .filter-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--u-line);
  background: transparent;
  border-radius: var(--r-pill);
  padding: 8px 14px;
  font-family: var(--font-sans);
  font-size: 13px;
  color: var(--slate-soft);
  cursor: pointer;
  transition: color 0.22s var(--ease), border-color 0.22s var(--ease), background 0.22s var(--ease);
}

.page-disclaimer .filter-btn:hover {
  color: var(--cyan-soft);
  border-color: var(--cyan-line);
}

.page-disclaimer .filter-btn.is-active,
.page-disclaimer .filter-btn[aria-pressed="true"] {
  color: var(--bg-deep);
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-disclaimer .filter-btn__count {
  font-family: var(--font-mono);
  font-size: 11px;
  opacity: 0.72;
}

.page-disclaimer .usage-empty {
  margin: 16px 0 0;
  padding: 14px 16px;
  border: 1px dashed var(--u-line);
  border-radius: var(--r-md);
  font-size: 14px;
  color: var(--slate-soft);
}

/* ---------- 双栏骨架 ---------- */
.page-disclaimer .usage-body {
  display: grid;
  gap: 26px;
  margin-top: clamp(26px, 4.5vw, 42px);
}

/* ---------- 目录（移动端横向胶囊） ---------- */
.page-disclaimer .usage-toc__title {
  display: none;
}

.page-disclaimer .usage-toc__list {
  list-style: none;
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 2px 0 6px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-disclaimer .usage-toc__list::-webkit-scrollbar {
  display: none;
}

.page-disclaimer .usage-toc__link {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  white-space: nowrap;
  padding: 7px 14px;
  border: 1px solid var(--u-line);
  border-radius: var(--r-pill);
  color: var(--fog);
  text-decoration: none;
  font-size: 13px;
  transition: border-color 0.22s var(--ease), color 0.22s var(--ease);
}

.page-disclaimer .usage-toc__link:hover {
  border-color: var(--cyan-line);
  color: var(--cyan-soft);
}

.page-disclaimer .usage-toc__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--orange);
}

/* ---------- 条款区块 ---------- */
.page-disclaimer .usage-rules {
  min-width: 0;
}

.page-disclaimer .usage-section + .usage-section {
  margin-top: clamp(30px, 5vw, 50px);
}

.page-disclaimer .usage-section__head {
  display: grid;
  gap: 8px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--u-line);
}

.page-disclaimer .usage-section__num {
  font-family: var(--font-cond);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-disclaimer .usage-section__title {
  font-family: var(--font-serif);
  font-size: clamp(20px, 3.4vw, 28px);
  font-weight: 700;
  margin: 0;
  color: var(--fog);
}

.page-disclaimer .usage-section__note {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--slate-soft);
}

.page-disclaimer .rule-list {
  display: grid;
  gap: 14px;
  margin-top: 18px;
}

.page-disclaimer .rule-card {
  position: relative;
  background: var(--u-card);
  border: 1px solid var(--u-line);
  border-radius: var(--r-lg);
  padding: 18px 18px 16px;
  transition: transform 0.26s var(--ease), border-color 0.26s var(--ease), box-shadow 0.26s var(--ease);
}

.page-disclaimer .rule-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  bottom: 18px;
  width: 2px;
  border-radius: var(--r-pill);
  background: linear-gradient(180deg, var(--cyan), transparent);
  opacity: 0.7;
}

.page-disclaimer .rule-card:hover {
  transform: translateY(-3px);
  border-color: var(--cyan-line);
  box-shadow: var(--shadow-soft);
}

.page-disclaimer .rule-card[hidden] {
  display: none;
}

.page-disclaimer .rule-card__head {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-disclaimer .rule-card__code {
  flex: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--orange);
  border: 1px solid rgba(255, 122, 26, 0.42);
  border-radius: 6px;
  padding: 2px 6px;
}

.page-disclaimer .rule-card__title {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--fog);
}

.page-disclaimer .rule-card__text {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--slate-soft);
}

.page-disclaimer .rule-card__key {
  color: var(--orange-soft);
  font-weight: 600;
}

.page-disclaimer .rule-card__link {
  color: var(--cyan-soft);
  text-decoration: underline;
  text-decoration-color: var(--cyan-line);
  text-underline-offset: 3px;
}

.page-disclaimer .rule-card__link:hover {
  color: var(--cyan);
}

.page-disclaimer .rule-card__more {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px dashed var(--u-line);
}

.page-disclaimer .rule-card__more summary {
  list-style: none;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--cyan);
}

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

.page-disclaimer .rule-card__more summary::before {
  content: "＋ ";
}

.page-disclaimer .rule-card__more[open] summary::before {
  content: "－ ";
}

.page-disclaimer .rule-card__more p {
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.78;
  color: var(--slate-soft);
}

/* ---------- 收束条 ---------- */
.page-disclaimer .usage-tail {
  display: grid;
  gap: 14px;
  margin-top: clamp(34px, 6vw, 58px);
  padding: clamp(20px, 4vw, 32px);
  border: 1px solid var(--cyan-line);
  border-radius: var(--r-xl);
  background:
    linear-gradient(135deg, rgba(47, 243, 208, 0.12), rgba(110, 31, 53, 0.24) 58%, rgba(46, 42, 107, 0.28));
}

.page-disclaimer .usage-tail__title {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(20px, 3.2vw, 26px);
  font-weight: 700;
  color: var(--fog);
}

.page-disclaimer .usage-tail__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--slate-soft);
  max-width: 56ch;
}

/* ---------- 中屏栅格 ---------- */
@media (min-width: 680px) {
  .page-disclaimer .rule-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- 桌面双栏 ---------- */
@media (min-width: 960px) {
  .page-disclaimer .usage-hero {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.85fr);
    align-items: end;
    gap: clamp(32px, 4vw, 56px);
  }

  .page-disclaimer .usage-hero__lead {
    font-size: 17px;
  }

  .page-disclaimer .usage-body {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: clamp(32px, 4vw, 52px);
    align-items: start;
  }

  .page-disclaimer .usage-toc {
    position: sticky;
    top: 112px;
    padding-left: 4px;
    border-left: 1px solid var(--cyan-line);
  }

  .page-disclaimer .usage-toc__title {
    display: block;
    margin: 0 0 12px 12px;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.16em;
    color: var(--slate-soft);
  }

  .page-disclaimer .usage-toc__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding: 0;
  }

  .page-disclaimer .usage-toc__link {
    display: flex;
    width: 100%;
    border: 0;
    border-radius: var(--r-md);
    padding: 9px 12px;
    white-space: normal;
    color: var(--slate-soft);
  }

  .page-disclaimer .usage-toc__link:hover {
    background: rgba(47, 243, 208, 0.08);
    color: var(--cyan-soft);
  }

  .page-disclaimer .usage-rules {
    border-left: 1px solid var(--u-track);
    padding-left: clamp(20px, 2.6vw, 34px);
  }
}

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

  .page-disclaimer .rule-card:hover {
    transform: none;
  }
}