.page-disclaimer {
  --u-line: rgba(90, 107, 120, .22);
  --u-line-dark: rgba(247, 250, 252, .18);
  --u-ink-soft: #33424c;
  --u-snow-soft: rgba(247, 250, 252, .84);
  background: var(--snow);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.8;
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-disclaimer .usage-hero {
  position: relative;
  background: linear-gradient(168deg, var(--deep) 0%, var(--lake) 78%, #0a4d74 100%);
  color: var(--snow);
  padding: clamp(26px, 5vw, 54px) 0 clamp(30px, 5.5vw, 64px);
  overflow: hidden;
}

.page-disclaimer .usage-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(247, 250, 252, .1) 1px, transparent 1px);
  background-size: 24px 24px;
  pointer-events: none;
}

.page-disclaimer .usage-hero::after {
  content: "";
  position: absolute;
  right: -6%;
  bottom: -40%;
  width: 52%;
  aspect-ratio: 1;
  background: radial-gradient(circle, rgba(255, 106, 43, .22) 0%, transparent 68%);
  pointer-events: none;
}

.page-disclaimer .usage-hero > .container {
  position: relative;
  z-index: 1;
}

.page-disclaimer .usage-hero .breadcrumb {
  margin-bottom: clamp(20px, 3.4vw, 34px);
}

.page-disclaimer .usage-hero .breadcrumb__item,
.page-disclaimer .usage-hero .breadcrumb__item a {
  color: rgba(247, 250, 252, .72);
  font-size: 13px;
  text-decoration: none;
}

.page-disclaimer .usage-hero .breadcrumb__item a:hover,
.page-disclaimer .usage-hero .breadcrumb__item a:focus-visible {
  color: var(--neon);
}

.page-disclaimer .usage-hero .eyebrow {
  color: var(--amber);
  margin: 0 0 14px;
}

.page-disclaimer .usage-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

.page-disclaimer .usage-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(29px, 5.6vw, 58px);
  line-height: 1.14;
  letter-spacing: -.015em;
  margin: 0 0 18px;
  max-width: 20ch;
}

.page-disclaimer .usage-hero__lede {
  margin: 0;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.9;
  color: var(--u-snow-soft);
  max-width: 60ch;
}

.page-disclaimer .usage-glance {
  position: relative;
  align-self: start;
  background: rgba(6, 47, 74, .58);
  padding: 22px 22px 24px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

.page-disclaimer .usage-glance::before {
  content: "";
  position: absolute;
  left: 0;
  top: 22px;
  bottom: 22px;
  width: 3px;
  background: var(--sun);
}

.page-disclaimer .usage-glance__title {
  margin: 0 0 14px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-disclaimer .usage-glance__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-disclaimer .usage-glance__list li {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
  justify-content: space-between;
  align-items: baseline;
  font-size: 14px;
  padding: 10px 0;
  border-bottom: 1px dashed var(--u-line-dark);
}

.page-disclaimer .usage-glance__list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-disclaimer .usage-glance__list li > span:first-child {
  color: rgba(247, 250, 252, .78);
}

.page-disclaimer .usage-glance__list .mono {
  color: var(--snow);
  font-size: 13px;
  letter-spacing: .02em;
}

/* ---------- 索引条 ---------- */
.page-disclaimer .usage-index {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: clamp(18px, 2.6vw, 26px) 0;
  border-bottom: 1px solid var(--u-line);
}

.page-disclaimer .usage-jump {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  background: #fff;
  border: 1px solid var(--u-line);
  border-left: 3px solid var(--sun);
  color: var(--ink);
  font-size: 13px;
  text-decoration: none;
  transition: transform .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease);
}

.page-disclaimer .usage-jump .mono {
  font-family: var(--font-data);
  font-size: 11px;
  font-weight: 600;
  color: var(--lake);
  letter-spacing: .04em;
}

.page-disclaimer .usage-jump:hover,
.page-disclaimer .usage-jump:focus-visible {
  transform: translateY(-3px);
  border-color: var(--sun);
  background: #fff7f2;
  outline: none;
}

.page-disclaimer .usage-jump:focus-visible {
  outline: 2px solid var(--neon);
  outline-offset: 2px;
}

/* ---------- 正文区 ---------- */
.page-disclaimer .usage-body {
  padding-bottom: clamp(36px, 6vw, 76px);
}

.page-disclaimer .usage-section {
  padding: clamp(28px, 4.4vw, 52px) 0;
  border-bottom: 1px solid var(--u-line);
  scroll-margin-top: 96px;
}

.page-disclaimer .usage-section:last-of-type {
  border-bottom: 0;
}

.page-disclaimer .usage-section__head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 16px;
}

.page-disclaimer .usage-section__num {
  position: relative;
  flex: none;
  font-family: var(--font-data);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .06em;
  color: var(--ink);
  line-height: 1.5;
  padding-right: 20px;
}

.page-disclaimer .usage-section__num::after {
  content: "";
  position: absolute;
  right: 2px;
  top: 6px;
  bottom: 6px;
  width: 3px;
  background: var(--sun);
  transform: skewX(-18deg);
}

.page-disclaimer .usage-section__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 3.2vw, 34px);
  line-height: 1.24;
  letter-spacing: -.01em;
}

.page-disclaimer .usage-section__lead {
  margin: 0 0 24px;
  max-width: 70ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.9;
  color: var(--u-ink-soft);
}

/* ---------- 更新节奏刻度 ---------- */
.page-disclaimer .usage-rail {
  position: relative;
  display: grid;
  gap: 26px;
  margin: 6px 0 4px;
}

.page-disclaimer .usage-rail__mark {
  position: relative;
  padding-top: 34px;
}

.page-disclaimer .usage-rail__dot {
  position: absolute;
  top: 2px;
  left: 0;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--sun);
  box-shadow: 0 0 0 5px rgba(255, 106, 43, .18);
}

.page-disclaimer .usage-rail__time {
  display: block;
  font-family: var(--font-data);
  font-size: clamp(24px, 3.4vw, 34px);
  font-weight: 600;
  letter-spacing: -.01em;
  color: var(--lake);
  line-height: 1.2;
}

.page-disclaimer .usage-rail__name {
  margin: 2px 0 6px;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--ink);
}

.page-disclaimer .usage-rail__desc {
  margin: 0;
  max-width: 46ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--u-ink-soft);
}

.page-disclaimer .usage-note {
  margin: 26px 0 0;
  padding: 16px 18px;
  background: rgba(11, 93, 140, .06);
  border-left: 3px solid var(--lake);
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--u-ink-soft);
}

.page-disclaimer .usage-note a {
  color: var(--lake);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 2px solid rgba(11, 93, 140, .3);
}

.page-disclaimer .usage-note a:hover,
.page-disclaimer .usage-note a:focus-visible {
  border-bottom-color: var(--sun);
  color: var(--sun);
}

/* ---------- 条目列表 ---------- */
.page-disclaimer .usage-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 4px;
}

.page-disclaimer .usage-item {
  position: relative;
  padding: 15px 0 15px 20px;
  border-left: 3px solid rgba(11, 93, 140, .32);
  transition: border-color .2s var(--ease), background .2s var(--ease);
}

.page-disclaimer .usage-item:hover {
  border-left-color: var(--lake);
  background: rgba(11, 93, 140, .04);
}

.page-disclaimer .usage-item__idx {
  display: block;
  font-family: var(--font-data);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .08em;
  color: var(--sun);
  margin-bottom: 6px;
}

.page-disclaimer .usage-item__idx::after {
  content: "";
  display: inline-block;
  width: 16px;
  height: 2px;
  margin-left: 9px;
  vertical-align: middle;
  background: var(--sun);
  transform: skewX(-30deg);
}

.page-disclaimer .usage-item__title {
  margin: 0 0 4px;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
}

.page-disclaimer .usage-item p {
  margin: 0;
  max-width: 74ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--u-ink-soft);
}

.page-disclaimer .usage-item p a {
  color: var(--lake);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 2px solid rgba(11, 93, 140, .3);
}

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

/* ---------- 引用关系图 ---------- */
.page-disclaimer .usage-figure {
  margin: 28px 0 0;
  background: linear-gradient(140deg, var(--deep) 0%, var(--lake) 100%);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
  overflow: hidden;
}

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

.page-disclaimer .usage-figure__cap {
  margin: 0;
  padding: 12px 20px 20px;
  font-family: var(--font-data);
  font-size: 12.5px;
  letter-spacing: .03em;
  color: rgba(247, 250, 252, .74);
}

/* ---------- 折叠条目 ---------- */
.page-disclaimer .usage-folds {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--u-line);
}

.page-disclaimer .usage-fold__trigger {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 4px;
  background: none;
  border: 0;
  border-bottom: 1px solid var(--u-line);
  text-align: left;
  cursor: pointer;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
  transition: background .2s var(--ease), padding-left .2s var(--ease);
}

.page-disclaimer .usage-fold__trigger:hover {
  background: rgba(11, 93, 140, .05);
  padding-left: 10px;
}

.page-disclaimer .usage-fold__trigger:focus-visible {
  outline: 2px solid var(--neon);
  outline-offset: -2px;
}

.page-disclaimer .usage-fold__idx {
  font-family: var(--font-data);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .08em;
  color: var(--sun);
  flex: none;
}

.page-disclaimer .usage-fold__label {
  flex: 1 1 auto;
}

.page-disclaimer .usage-fold__mark {
  position: relative;
  flex: none;
  width: 16px;
  height: 16px;
}

.page-disclaimer .usage-fold__mark::before,
.page-disclaimer .usage-fold__mark::after {
  content: "";
  position: absolute;
  background: var(--lake);
  transition: transform .2s var(--ease), background .2s var(--ease);
}

.page-disclaimer .usage-fold__mark::before {
  left: 0;
  right: 0;
  top: 7px;
  height: 2px;
}

.page-disclaimer .usage-fold__mark::after {
  top: 0;
  bottom: 0;
  left: 7px;
  width: 2px;
}

.page-disclaimer .usage-fold__trigger[aria-expanded="true"] .usage-fold__mark::after {
  transform: scaleY(0);
}

.page-disclaimer .usage-fold__trigger[aria-expanded="true"] .usage-fold__mark::before {
  background: var(--sun);
}

.page-disclaimer .usage-fold__body {
  border-bottom: 1px solid var(--u-line);
  padding: 4px 4px 18px 34px;
  background: rgba(11, 93, 140, .035);
}

.page-disclaimer .usage-fold__body p {
  margin: 12px 0 0;
  max-width: 70ch;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--u-ink-soft);
}

/* ---------- 收束区 ---------- */
.page-disclaimer .usage-foot {
  margin-top: clamp(34px, 5vw, 60px);
  padding: clamp(24px, 4vw, 42px);
  background: linear-gradient(135deg, var(--deep) 0%, var(--lake) 100%);
  color: var(--snow);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

.page-disclaimer .usage-foot__text {
  margin: 0 0 22px;
  max-width: 62ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.9;
  color: var(--u-snow-soft);
}

.page-disclaimer .usage-foot__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-disclaimer .usage-rail {
    grid-template-columns: 1fr 1fr;
    gap: clamp(28px, 5vw, 60px);
  }

  .page-disclaimer .usage-rail::before {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: 8px;
    height: 2px;
    background: linear-gradient(90deg, rgba(255, 106, 43, .18) 0%, rgba(255, 106, 43, .68) 50%, rgba(255, 106, 43, .18) 100%);
  }
}

@media (min-width: 900px) {
  .page-disclaimer .usage-hero__grid {
    grid-template-columns: minmax(0, 1.18fr) minmax(0, .82fr);
    align-items: start;
  }

  .page-disclaimer .usage-list {
    gap: 6px;
  }

  .page-disclaimer .usage-item {
    padding: 18px 0 18px 24px;
  }
}

@media (min-width: 1100px) {
  .page-disclaimer .usage-section__head {
    gap: 20px;
  }

  .page-disclaimer .usage-section__num {
    font-size: 15px;
  }
}

@media (max-width: 480px) {
  .page-disclaimer .usage-jump {
    font-size: 12.5px;
    padding: 7px 11px;
  }

  .page-disclaimer .usage-fold__trigger {
    gap: 10px;
    font-size: 15px;
  }

  .page-disclaimer .usage-fold__body {
    padding-left: 18px;
  }
}