/* ===== 使用规范页 · page-disclaimer ===== */
.page-disclaimer {
  --dsc-max: 880px;
  --dsc-cyan-line: rgba(0, 224, 255, 0.55);
  --dsc-rule: rgba(38, 51, 61, 0.55);
  --dsc-anchor-h: 58px;
  background: var(--ink);
  color: var(--text);
  padding-bottom: clamp(56px, 9vw, 112px);
}

/* --- 面包屑区域呼吸 --- */
.page-disclaimer .breadcrumb {
  padding-top: clamp(20px, 4vw, 36px);
}

/* --- 首屏：无横幅，直接进入声明 --- */
.page-disclaimer .usage-hero {
  position: relative;
  padding: clamp(24px, 5vw, 56px) 0 clamp(22px, 4vw, 38px);
}

.page-disclaimer .usage-hero::before {
  content: "";
  position: absolute;
  left: 0;
  top: clamp(30px, 6vw, 66px);
  width: 3px;
  height: 52px;
  background: linear-gradient(180deg, var(--cyan), rgba(0, 224, 255, 0));
}

.page-disclaimer .eyebrow {
  display: inline-block;
  padding-left: 14px;
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.page-disclaimer .usage-hero__title {
  margin: 12px 0 16px;
  padding-left: 14px;
  font-size: clamp(2.4rem, 7vw, 4.4rem);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: -0.02em;
  background: linear-gradient(98deg, var(--text) 42%, var(--cyan) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.page-disclaimer .usage-hero__lede {
  max-width: 62ch;
  margin: 0;
  padding-left: 14px;
  color: var(--muted);
  font-size: var(--fs-body);
  line-height: 1.75;
}

.page-disclaimer .usage-hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 22px 0 0;
  padding: 0 0 0 14px;
  list-style: none;
}

.page-disclaimer .usage-hero__tags .tag {
  font-weight: 700;
  letter-spacing: 0.06em;
}

.page-disclaimer .usage-hero__tags .is-strong {
  font-weight: 700;
  color: var(--magenta);
  border-color: var(--magenta-soft);
}

/* --- 主视觉 --- */
.page-disclaimer .usage-visual {
  margin: 0 0 clamp(28px, 5vw, 52px);
}

.page-disclaimer .usage-visual .media-frame__cap {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: 0.08em;
}

/* --- 顶部锚点条：滚动吸附 --- */
.page-disclaimer .usage-anchor {
  position: sticky;
  top: var(--header-h);
  z-index: 30;
  margin-top: clamp(20px, 4vw, 40px);
  margin-bottom: clamp(8px, 1.6vw, 18px);
  background: rgba(12, 17, 22, 0.94);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-disclaimer .usage-anchor__inner {
  display: flex;
  align-items: center;
}

.page-disclaimer .usage-anchor__list {
  display: flex;
  align-items: center;
  gap: 2px;
  flex: 1 1 auto;
  min-width: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

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

.page-disclaimer .usage-anchor__link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 15px 12px 13px;
  color: var(--muted);
  font-size: var(--fs-meta);
  text-decoration: none;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-disclaimer .usage-anchor__link:hover {
  color: var(--text);
}

.page-disclaimer .usage-anchor__link:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -4px;
}

.page-disclaimer .usage-anchor__link.is-active {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-disclaimer .usage-anchor__no {
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--cyan);
  opacity: 0.8;
}

/* --- 条款正文：单栏 --- */
.page-disclaimer .usage-body {
  max-width: var(--dsc-max);
  margin-inline: auto;
}

.page-disclaimer .clause {
  scroll-margin-top: calc(var(--header-h) + var(--dsc-anchor-h) + 12px);
}

.page-disclaimer .clause::before {
  content: "";
  display: block;
  height: 1px;
  margin-bottom: clamp(24px, 4vw, 40px);
  background: linear-gradient(90deg, var(--dsc-cyan-line) 0%, rgba(0, 224, 255, 0.1) 52%, rgba(0, 224, 255, 0) 100%);
}

.page-disclaimer .clause__head {
  display: flex;
  align-items: baseline;
  gap: clamp(12px, 2vw, 20px);
  margin-bottom: clamp(14px, 2.4vw, 22px);
}

.page-disclaimer .clause__no {
  flex: 0 0 auto;
  font-size: clamp(1.5rem, 3.4vw, 2.2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  letter-spacing: 0.02em;
  text-shadow: 0 0 20px rgba(0, 224, 255, 0.35);
}

.page-disclaimer .clause__title {
  margin: 0;
  font-size: clamp(1.22rem, 2.6vw, 1.75rem);
  font-weight: 700;
  line-height: 1.32;
  letter-spacing: -0.01em;
}

.page-disclaimer .clause__list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-left: 1px solid var(--line);
}

.page-disclaimer .clause__item {
  position: relative;
  padding: 12px 0 12px clamp(16px, 2.6vw, 26px);
  color: #cddde5;
  font-size: 15.5px;
  line-height: 1.72;
  border-bottom: 1px solid var(--dsc-rule);
  transition: color 160ms var(--ease), background-color 160ms var(--ease);
}

.page-disclaimer .clause__item:last-child {
  border-bottom: 0;
}

.page-disclaimer .clause__item:hover {
  color: var(--text);
  background-image: linear-gradient(90deg, rgba(0, 224, 255, 0.06), rgba(0, 224, 255, 0) 78%);
}

.page-disclaimer .clause__item::after {
  content: attr(data-clause);
  position: absolute;
  top: 15px;
  right: 2px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--cyan);
  opacity: 0;
  transform: translateX(8px);
  pointer-events: none;
  display: none;
  transition: opacity 180ms var(--ease), transform 180ms var(--ease);
}

.page-disclaimer .clause__item:hover::after {
  opacity: 0.85;
  transform: translateX(0);
}

/* 注意事项：品红左竖线 */
.page-disclaimer .clause__item--note::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: var(--magenta);
  box-shadow: 0 0 10px rgba(255, 45, 120, 0.45);
}

.page-disclaimer .clause__item--note:hover {
  background-image: linear-gradient(90deg, rgba(255, 45, 120, 0.07), rgba(255, 45, 120, 0) 78%);
}

/* --- 行内元素 --- */
.page-disclaimer .mono {
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 0.94em;
  letter-spacing: 0.01em;
}

.page-disclaimer .link-inline {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan-soft);
  transition: border-color 160ms var(--ease);
}

.page-disclaimer .link-inline:hover {
  border-bottom-color: var(--cyan);
}

.page-disclaimer .tone {
  font-weight: 700;
}

.page-disclaimer .tone--a {
  color: var(--mint);
}

.page-disclaimer .tone--b {
  color: var(--cyan);
}

.page-disclaimer .tone--c {
  color: var(--magenta);
}

/* --- 底部行动区 --- */
.page-disclaimer .usage-cta {
  margin-top: clamp(40px, 6vw, 72px);
  padding: clamp(22px, 4vw, 38px);
  background: linear-gradient(140deg, var(--panel) 0%, var(--ink) 100%);
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
}

.page-disclaimer .usage-cta__title {
  margin: 0 0 10px;
  font-size: clamp(1.15rem, 2.2vw, 1.5rem);
  line-height: 1.32;
}

.page-disclaimer .usage-cta__text {
  max-width: 56ch;
  margin: 0 0 20px;
  color: var(--muted);
  font-size: 15.5px;
  line-height: 1.7;
}

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

/* --- 回到顶部 --- */
.page-disclaimer .usage-top {
  position: fixed;
  right: clamp(14px, 3vw, 32px);
  bottom: clamp(14px, 3vw, 32px);
  z-index: 40;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 14px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted);
  text-decoration: none;
  background: rgba(12, 17, 22, 0.9);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  border: 1px solid var(--line);
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

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

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

/* --- 中等屏幕及以上 --- */
@media (min-width: 640px) {
  .page-disclaimer .clause__item {
    padding-right: clamp(30px, 4vw, 52px);
  }

  .page-disclaimer .clause__item::after {
    display: block;
  }
}

@media (min-width: 900px) {
  .page-disclaimer .usage-anchor__link {
    padding-inline: 16px;
  }

  .page-disclaimer .clause__item {
    font-size: 16px;
  }

  .page-disclaimer .usage-cta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
  }

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

  .page-disclaimer .usage-cta__actions {
    flex: 0 0 auto;
    margin-top: 0;
  }
}

/* --- 窄屏收敛 --- */
@media (max-width: 480px) {
  .page-disclaimer .usage-hero__title {
    padding-left: 12px;
  }

  .page-disclaimer .usage-hero__lede,
  .page-disclaimer .usage-hero__tags,
  .page-disclaimer .eyebrow {
    padding-left: 12px;
  }

  .page-disclaimer .usage-hero__tags .tag {
    font-size: 11px;
  }

  .page-disclaimer .usage-top span {
    letter-spacing: 0.08em;
  }
}

/* --- 动效可关闭 --- */
@media (prefers-reduced-motion: reduce) {
  .page-disclaimer .clause__item,
  .page-disclaimer .clause__item::after,
  .page-disclaimer .usage-anchor__link,
  .page-disclaimer .usage-top {
    transition: none;
  }

  .page-disclaimer .clause__item::after {
    transform: none;
  }
}
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