/* ===== 使用规范 /usage/ ===== */
.page-disclaimer {
  --rule-rail: 2.4rem;
  --rule-pad: clamp(20px, 3.4vw, 34px);
  position: relative;
  padding-bottom: clamp(56px, 10vw, 120px);
  overflow-x: hidden;
}

.page-disclaimer .breadcrumb {
  margin-top: clamp(14px, 2.6vw, 28px);
}

/* ---------- 首屏框景 ---------- */
.page-disclaimer .usage-hero {
  margin-top: clamp(14px, 2.6vw, 30px);
}

.page-disclaimer .usage-hero__frame {
  position: relative;
  border: 1px solid var(--glass-line);
  border-radius: var(--radius-l);
  overflow: hidden;
  background:
    radial-gradient(120% 150% at 8% -10%, rgba(201, 162, 76, 0.18), transparent 56%),
    radial-gradient(90% 130% at 94% 4%, rgba(139, 92, 246, 0.16), transparent 62%),
    linear-gradient(158deg, rgba(18, 51, 42, 0.94) 0%, rgba(10, 28, 23, 0.96) 100%);
  box-shadow: inset 0 1px 0 rgba(244, 240, 230, 0.06);
}

.page-disclaimer .usage-hero__frame::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 9px;
  background-image: repeating-linear-gradient(
    90deg,
    rgba(201, 162, 76, 0.55) 0 1px,
    transparent 1px 20px
  );
  opacity: 0.45;
  pointer-events: none;
}

.page-disclaimer .usage-hero__body {
  padding: clamp(28px, 5vw, 58px) clamp(20px, 4.6vw, 56px) clamp(22px, 3.6vw, 38px);
}

.page-disclaimer .usage-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.85rem, 4.6vw, 3.35rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 0.7rem 0 1.1rem;
  max-width: 20ch;
  background: linear-gradient(180deg, var(--gold-hi) 0%, var(--gold) 58%, #a8863c 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: 0 1px 0 rgba(8, 21, 15, 0.4);
}

.page-disclaimer .usage-hero__lead {
  max-width: 44em;
  margin: 0;
  font-size: clamp(0.98rem, 1.4vw, 1.06rem);
  line-height: 1.9;
  color: var(--paper);
}

/* 章节索引（横向滑动） */
.page-disclaimer .usage-index {
  list-style: none;
  display: flex;
  gap: 0.5rem;
  margin: 1.5rem 0 0;
  padding: 0.35rem 0 0.85rem;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: rgba(201, 162, 76, 0.45) transparent;
}

.page-disclaimer .usage-index::-webkit-scrollbar {
  height: 4px;
}

.page-disclaimer .usage-index::-webkit-scrollbar-thumb {
  background: rgba(201, 162, 76, 0.45);
  border-radius: 4px;
}

.page-disclaimer .usage-index > li {
  flex: 0 0 auto;
  scroll-snap-align: start;
}

.page-disclaimer .usage-index a {
  display: inline-flex;
  align-items: baseline;
  gap: 0.5rem;
  padding: 0.48rem 0.9rem;
  border: 1px solid var(--glass-line);
  border-radius: 999px;
  background: var(--glass);
  color: var(--paper);
  font-size: 0.86rem;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 0.26s var(--ease), background-color 0.26s var(--ease),
    color 0.26s var(--ease), transform 0.26s var(--ease);
}

.page-disclaimer .usage-index a .mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.76rem;
  color: var(--gold);
  letter-spacing: 0.04em;
}

.page-disclaimer .usage-index a:hover,
.page-disclaimer .usage-index a:focus-visible {
  border-color: rgba(201, 162, 76, 0.6);
  background: rgba(201, 162, 76, 0.12);
  color: var(--gold-hi);
  transform: translateY(-1px);
}

.page-disclaimer .usage-index a:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}

/* 首屏横幅 */
.page-disclaimer .usage-hero__banner {
  margin: 0;
  border-top: 1px solid var(--line);
  background: linear-gradient(140deg, rgba(18, 51, 42, 0.9), rgba(8, 21, 15, 0.95));
}

.page-disclaimer .usage-hero__banner img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 12 / 5;
  object-fit: cover;
  opacity: 0.9;
}

/* ---------- 正文规则列表 ---------- */
.page-disclaimer .usage-body {
  margin-top: clamp(34px, 6vw, 72px);
}

.page-disclaimer .rule-list {
  list-style: none;
  counter-reset: sec;
  margin: 0;
  padding: 0;
}

.page-disclaimer .rule {
  position: relative;
  counter-increment: sec;
  display: grid;
  grid-template-columns: var(--rule-rail) minmax(0, 1fr);
  gap: clamp(12px, 2.2vw, 26px);
  padding: clamp(26px, 4.4vw, 46px) 0 clamp(26px, 4.4vw, 46px) 0.4rem;
  border-top: 1px solid var(--line);
  scroll-margin-top: 120px;
  transition: background-color 0.32s var(--ease);
}

.page-disclaimer .rule:last-child {
  border-bottom: 1px solid var(--line);
}

.page-disclaimer .rule::after {
  content: "";
  position: absolute;
  left: -6px;
  top: 14px;
  bottom: 14px;
  width: 3px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--gold-hi), var(--violet));
  transform: skewY(-16deg) scaleY(0);
  transform-origin: top center;
  transition: transform 0.36s var(--ease);
  pointer-events: none;
}

.page-disclaimer .rule__rail {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.55rem;
  padding-top: 0.25rem;
}

.page-disclaimer .rule__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--gold);
  transition: color 0.28s var(--ease), text-shadow 0.28s var(--ease);
}

.page-disclaimer .rule__num::before {
  content: counter(sec, decimal-leading-zero);
}

.page-disclaimer .rule__line {
  flex: 1 1 auto;
  width: 1px;
  min-height: 32px;
  background: linear-gradient(
    180deg,
    rgba(201, 162, 76, 0.55),
    rgba(53, 214, 240, 0.18) 62%,
    transparent 100%
  );
}

.page-disclaimer .rule__body {
  max-width: 46em;
}

.page-disclaimer .rule__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.28rem, 2.6vw, 1.85rem);
  line-height: 1.35;
  letter-spacing: -0.005em;
  margin: 0 0 0.6rem;
  color: var(--paper);
}

.page-disclaimer .rule__lead {
  margin: 0;
  font-size: 1rem;
  line-height: 1.9;
  color: var(--mist);
}

.page-disclaimer .rule__items {
  list-style: none;
  counter-reset: item;
  display: grid;
  gap: 0.9rem;
  margin: 1.2rem 0 0;
  padding: 0;
}

.page-disclaimer .rule__items > li {
  counter-increment: item;
  position: relative;
  padding-left: 2.7rem;
  font-size: 0.98rem;
  line-height: 1.88;
  color: var(--paper);
  border-radius: var(--radius-s);
  transition: color 0.26s var(--ease), transform 0.26s var(--ease);
}

.page-disclaimer .rule__items > li::before {
  content: counter(item, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0.24em;
  padding: 0.1rem 0.36rem;
  border: 1px solid rgba(201, 162, 76, 0.3);
  border-radius: 4px;
  background: rgba(201, 162, 76, 0.1);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.74rem;
  letter-spacing: 0.05em;
  line-height: 1.5;
  color: var(--gold);
}

.page-disclaimer .rule__items a {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 214, 240, 0.4);
  transition: color 0.24s var(--ease), border-color 0.24s var(--ease);
}

.page-disclaimer .rule__items a:hover,
.page-disclaimer .rule__items a:focus-visible {
  color: var(--gold-hi);
  border-bottom-color: rgba(241, 217, 143, 0.7);
}

.page-disclaimer .rule__items a:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
  border-radius: 2px;
}

@media (hover: hover) {
  .page-disclaimer .rule:hover {
    background: linear-gradient(90deg, rgba(201, 162, 76, 0.07), transparent 64%);
  }

  .page-disclaimer .rule:hover::after,
  .page-disclaimer .rule:focus-within::after {
    transform: skewY(-16deg) scaleY(1);
  }

  .page-disclaimer .rule:hover .rule__num {
    color: var(--gold-hi);
    text-shadow: 0 0 12px rgba(201, 162, 76, 0.5);
  }

  .page-disclaimer .rule__items > li:hover {
    color: #ffffff;
    transform: translateX(3px);
  }
}

/* ---------- 收束区块 ---------- */
.page-disclaimer .usage-next {
  margin-top: clamp(48px, 8vw, 96px);
  padding: clamp(24px, 4vw, 40px);
  border: 1px solid var(--glass-line);
  border-radius: var(--radius-l);
  background:
    radial-gradient(110% 150% at 100% 0%, rgba(53, 214, 240, 0.1), transparent 58%),
    linear-gradient(150deg, rgba(18, 51, 42, 0.86), rgba(10, 28, 23, 0.92));
}

.page-disclaimer .usage-next__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.15rem, 2.2vw, 1.5rem);
  margin: 0 0 0.7rem;
  color: var(--gold-hi);
  letter-spacing: 0.01em;
}

.page-disclaimer .usage-next__lead {
  max-width: 44em;
  margin: 0 0 1.3rem;
  font-size: 0.96rem;
  line-height: 1.9;
  color: var(--paper);
}

.page-disclaimer .usage-next__links {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin: 0;
  padding: 0;
}

.page-disclaimer .usage-next__links a {
  display: inline-block;
  padding: 0.55rem 1.05rem;
  border: 1px solid rgba(201, 162, 76, 0.42);
  border-radius: 999px;
  font-size: 0.88rem;
  color: var(--gold-hi);
  text-decoration: none;
  transition: background-color 0.26s var(--ease), color 0.26s var(--ease),
    border-color 0.26s var(--ease), transform 0.26s var(--ease);
}

.page-disclaimer .usage-next__links a:hover,
.page-disclaimer .usage-next__links a:focus-visible {
  background: rgba(201, 162, 76, 0.16);
  border-color: var(--gold);
  color: #ffffff;
  transform: translateY(-2px);
}

.page-disclaimer .usage-next__links a:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 900px) {
  .page-disclaimer {
    --rule-rail: 3.4rem;
  }

  .page-disclaimer .rule {
    grid-template-columns: var(--rule-rail) minmax(0, 1fr);
    padding-left: 0.8rem;
  }

  .page-disclaimer .rule__num {
    font-size: 1.28rem;
  }

  .page-disclaimer .rule__items > li {
    padding-left: 3rem;
  }
}

@media (max-width: 560px) {
  .page-disclaimer {
    --rule-rail: 2.1rem;
  }

  .page-disclaimer .rule {
    gap: 0.75rem;
    padding-left: 0.2rem;
  }

  .page-disclaimer .rule__num {
    font-size: 0.92rem;
  }

  .page-disclaimer .rule__items > li {
    padding-left: 2.45rem;
    font-size: 0.94rem;
  }

  .page-disclaimer .usage-hero h1 {
    max-width: none;
  }

  .page-disclaimer .usage-next__links a {
    flex: 1 1 calc(50% - 0.6rem);
    text-align: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-disclaimer .rule,
  .page-disclaimer .rule::after,
  .page-disclaimer .rule__num,
  .page-disclaimer .rule__items > li,
  .page-disclaimer .usage-index a,
  .page-disclaimer .usage-next__links a {
    transition: none;
  }

  .page-disclaimer .rule::after {
    transform: skewY(-16deg) scaleY(1);
    opacity: 0.35;
  }

  .page-disclaimer .rule:hover,
  .page-disclaimer .usage-index a:hover,
  .page-disclaimer .usage-next__links a:hover,
  .page-disclaimer .rule__items > li:hover {
    transform: none;
  }

  .page-disclaimer .rule__items > li:hover {
    color: var(--paper);
  }
}