.page-disclaimer {
  --usage-section-gap: clamp(56px, 8vw, 104px);
  --usage-card-gap: clamp(34px, 5vw, 48px);
  overflow-x: hidden;
}

.page-disclaimer .usage-anchor {
  display: block;
  height: 0;
  scroll-margin-top: calc(var(--header-h) + 24px);
}

/* ---------- 首屏 ---------- */

.page-disclaimer .usage-hero {
  position: relative;
  padding-top: calc(var(--header-h) + 44px);
  padding-bottom: clamp(24px, 4vw, 40px);
  overflow: hidden;
}

.page-disclaimer .usage-hero::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 260px;
  pointer-events: none;
  background:
    radial-gradient(120% 100% at 10% 0%, rgba(53, 242, 160, 0.15), transparent 62%),
    radial-gradient(90% 120% at 90% 6%, rgba(60, 140, 255, 0.2), transparent 68%);
}

.page-disclaimer .usage-hero .shell {
  position: relative;
}

.page-disclaimer .usage-topline {
  display: block;
  height: 3px;
  width: 100%;
  margin: clamp(20px, 3vw, 32px) 0 clamp(24px, 4vw, 36px);
  background: linear-gradient(90deg, var(--neon) 0%, var(--blue) 46%, rgba(60, 140, 255, 0) 92%);
}

.page-disclaimer .usage-title {
  font-size: clamp(2rem, 5.6vw, 4.1rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
  max-width: 20ch;
  margin: 14px 0 0;
}

.page-disclaimer .usage-lede {
  max-width: 60ch;
  margin-top: 20px;
  color: rgba(242, 247, 255, 0.76);
}

.page-disclaimer .usage-hero-media {
  margin: clamp(30px, 5vw, 52px) 0 0;
  border: 2px solid var(--line);
  border-radius: 4px;
  overflow: hidden;
  background: var(--ink-2);
  box-shadow: var(--shadow);
}

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

/* ---------- 目录 ---------- */

.page-disclaimer .usage-index {
  margin-top: clamp(36px, 5vw, 60px);
}

.page-disclaimer .usage-index details {
  border: 2px solid var(--line);
  border-radius: 4px;
  background: var(--ink-2);
  box-shadow: var(--shadow-soft);
}

.page-disclaimer .usage-index summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--neon);
}

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

.page-disclaimer .usage-index summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1.05rem;
  line-height: 1;
  color: var(--mute);
}

.page-disclaimer .usage-index details[open] summary::after {
  content: "–";
  color: var(--neon);
}

.page-disclaimer .usage-index ol {
  margin: 0;
  padding: 4px 18px 20px;
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-disclaimer .usage-index a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 8px 0;
  border-bottom: 1px solid var(--line);
  color: rgba(242, 247, 255, 0.82);
  text-decoration: none;
  font-size: 0.95rem;
  line-height: 1.5;
  transition: color 220ms var(--ease), border-color 220ms var(--ease);
}

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

.page-disclaimer .idx-num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--blue);
}

/* ---------- 条款 ---------- */

.page-disclaimer .usage-terms {
  margin-top: var(--usage-section-gap);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--usage-card-gap);
}

.page-disclaimer .term {
  position: relative;
  padding-left: clamp(18px, 2.4vw, 26px);
  border-left: 2px solid var(--line);
}

.page-disclaimer .term::before {
  content: "";
  position: absolute;
  left: -2px;
  top: 0;
  width: 2px;
  height: 58px;
  background: linear-gradient(180deg, var(--neon), rgba(53, 242, 160, 0));
}

.page-disclaimer .term-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 14px;
}

.page-disclaimer .term-num {
  position: relative;
  flex: none;
  padding-right: 32px;
  font-family: var(--font-mono);
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--neon);
}

.page-disclaimer .term-num::after {
  content: "";
  position: absolute;
  right: 0;
  top: 50%;
  width: 20px;
  height: 2px;
  background: var(--neon);
  opacity: 0.7;
  transform: translateY(-50%);
}

.page-disclaimer .term-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.02rem, 2vw, 1.28rem);
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-disclaimer .term-body p {
  margin: 0 0 12px;
  max-width: 58ch;
  font-size: 0.97rem;
  line-height: 1.8;
  color: rgba(242, 247, 255, 0.76);
}

.page-disclaimer .term-body p:last-child {
  margin-bottom: 0;
}

.page-disclaimer .term-body a {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(60, 140, 255, 0.45);
  transition: color 220ms var(--ease), border-color 220ms var(--ease);
}

.page-disclaimer .term-body a:hover,
.page-disclaimer .term-body a:focus-visible {
  color: var(--neon);
  border-color: var(--neon);
}

.page-disclaimer .term-note {
  margin: 16px 0 0;
  padding: 4px 0 4px 14px;
  max-width: 56ch;
  border-left: 2px solid var(--blue);
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--mute);
}

/* ---------- 收尾色带 ---------- */

.page-disclaimer .usage-band {
  position: relative;
  margin-top: var(--usage-section-gap);
  padding: clamp(52px, 7vw, 88px) 0;
  background:
    linear-gradient(118deg, rgba(53, 242, 160, 0.15) 0%, rgba(60, 140, 255, 0.16) 48%, rgba(6, 11, 20, 0) 100%);
  clip-path: polygon(0 22px, 100% 0, 100% calc(100% - 22px), 0 100%);
}

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

.page-disclaimer .usage-band-title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.5rem, 3.4vw, 2.4rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-disclaimer .usage-band p {
  margin: 0;
  max-width: 54ch;
  font-size: 0.97rem;
  line-height: 1.8;
  color: rgba(242, 247, 255, 0.78);
}

.page-disclaimer .usage-band-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.page-disclaimer .to-top {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border: 2px solid var(--line);
  border-radius: 999px;
  background: rgba(13, 26, 43, 0.7);
  color: var(--mute);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  transition: color 220ms var(--ease), border-color 220ms var(--ease);
}

.page-disclaimer .to-top::before {
  content: "↑";
  font-size: 0.9rem;
  line-height: 1;
}

.page-disclaimer .to-top:hover,
.page-disclaimer .to-top:focus-visible {
  color: var(--neon);
  border-color: var(--neon);
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-disclaimer .usage-index ol {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(20px, 3vw, 36px);
  }

  .page-disclaimer .usage-band-inner {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: end;
    gap: 32px;
  }

  .page-disclaimer .usage-band-actions {
    justify-content: flex-end;
  }
}

@media (min-width: 960px) {
  .page-disclaimer .usage-terms {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(36px, 4.5vw, 64px);
    row-gap: clamp(44px, 4vw, 60px);
  }

  .page-disclaimer .term-body p {
    font-size: 1rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-disclaimer .usage-index a,
  .page-disclaimer .term-body a,
  .page-disclaimer .to-top {
    transition: none;
  }
}