.page-disclaimer {
  --disc-pad: clamp(48px, 8vw, 96px);
  --disc-panel: rgba(14, 22, 38, 0.88);
  --disc-text-soft: rgba(232, 238, 247, 0.76);
  background: var(--void);
  color: var(--white);
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-disclaimer .breadcrumbs {
  padding-top: clamp(14px, 2.4vw, 22px);
}

.page-disclaimer .crumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--grid);
}

.page-disclaimer .crumb-list li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line-strong);
}

.page-disclaimer .crumb-link {
  color: var(--grid);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-disclaimer .crumb-link:hover,
.page-disclaimer .crumb-link:focus-visible {
  color: var(--signal);
  border-bottom-color: var(--signal);
}

.page-disclaimer .crumb-current {
  color: var(--white);
}

/* ---------- 首屏 ---------- */
.page-disclaimer .usage-hero {
  position: relative;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(130% 90% at 50% -10%, rgba(43, 76, 126, 0.42) 0%, rgba(7, 11, 20, 0) 62%),
    var(--void);
}

.page-disclaimer .usage-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(138, 148, 166, 0.1) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(138, 148, 166, 0.1) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, transparent 82%);
  mask-image: linear-gradient(to bottom, #000 0%, transparent 82%);
}

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

.page-disclaimer .usage-rail {
  display: grid;
  grid-template-columns: 1fr;
  margin: clamp(18px, 3vw, 28px) 0 0;
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
}

.page-disclaimer .usage-rail-item {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  padding: 10px 2px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  border-bottom: 1px dashed var(--line);
}

.page-disclaimer .usage-rail-item:last-child {
  border-bottom: 0;
}

.page-disclaimer .usage-rail-key {
  color: var(--grid);
  flex: none;
}

.page-disclaimer .usage-rail-val {
  color: var(--white);
  font-weight: 600;
}

.page-disclaimer .usage-lamp {
  flex: none;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 3px rgba(61, 220, 132, 0.16);
  animation: disclaimer-pulse 2.8s ease-in-out infinite;
}

@keyframes disclaimer-pulse {
  0%, 100% { opacity: 0.5; }
  50% { opacity: 1; }
}

.page-disclaimer .usage-hero-head {
  display: grid;
  gap: 16px;
  padding: clamp(26px, 4.5vw, 44px) 0 clamp(22px, 3.6vw, 34px);
}

.page-disclaimer .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.2em;
  color: var(--signal);
}

.page-disclaimer h1.display {
  margin: 0;
  font-family: var(--font-sans);
  font-size: clamp(32px, 7.4vw, 68px);
  font-weight: 900;
  line-height: 1.03;
  letter-spacing: -0.035em;
  color: var(--white);
  text-wrap: balance;
}

.page-disclaimer .usage-lead {
  margin: 0;
  max-width: 58ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--disc-text-soft);
}

.page-disclaimer .usage-figure {
  margin: 0 0 clamp(32px, 5vw, 56px);
  border: 1px solid var(--line-strong);
  background: var(--console);
}

.page-disclaimer .usage-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-disclaimer .usage-figure .media-caption {
  padding: 12px 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.7;
  color: var(--grid);
  border-top: 1px solid var(--line);
}

/* ---------- 主体双栏 ---------- */
.page-disclaimer .usage-body {
  padding: var(--disc-pad) 0;
  background:
    linear-gradient(180deg, rgba(14, 22, 38, 0.65) 0%, rgba(7, 11, 20, 1) 40%),
    var(--void);
}

.page-disclaimer .usage-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 4vw, 44px);
}

/* ---------- 目录 ---------- */
.page-disclaimer .usage-toc {
  border: 1px solid var(--line-strong);
  background: var(--disc-panel);
  padding: 18px clamp(16px, 3vw, 20px);
}

.page-disclaimer .usage-toc-head {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.22em;
  color: var(--grid);
}

.page-disclaimer .usage-toc-list {
  display: grid;
  gap: 2px;
  margin: 0 0 16px;
  padding: 0;
  list-style: none;
  counter-reset: toc;
}

.page-disclaimer .usage-toc-link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 8px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--white);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: background-color 180ms ease, border-color 180ms ease, color 180ms ease;
}

.page-disclaimer .usage-toc-link:hover,
.page-disclaimer .usage-toc-link:focus-visible {
  background: rgba(255, 90, 31, 0.1);
  border-left-color: var(--signal);
  color: var(--signal);
}

.page-disclaimer .toc-num {
  flex: none;
  font-size: 11.5px;
  color: var(--signal);
}

.page-disclaimer .usage-toc-cta {
  display: block;
  padding: 11px 12px;
  font-size: 13px;
  line-height: 1.5;
  text-align: center;
  text-decoration: none;
  color: var(--white);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  transition: border-color 180ms ease, color 180ms ease;
}

.page-disclaimer .usage-toc-cta:hover,
.page-disclaimer .usage-toc-cta:focus-visible {
  border-color: var(--green);
  color: var(--green);
}

/* ---------- 条款卡片 ---------- */
.page-disclaimer .usage-clauses {
  display: grid;
  gap: clamp(16px, 2.6vw, 22px);
}

.page-disclaimer .clause {
  padding: clamp(20px, 3.6vw, 32px);
  background: var(--disc-panel);
  border: 1px solid var(--line);
  border-left: 3px solid var(--line-strong);
  scroll-margin-top: 24px;
  transition: border-left-color 200ms ease;
}

.page-disclaimer .clause:target,
.page-disclaimer .clause:hover {
  border-left-color: var(--signal);
}

.page-disclaimer .clause-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 14px;
  align-items: start;
}

.page-disclaimer .clause-num {
  font-size: clamp(26px, 5vw, 40px);
  line-height: 0.95;
  font-weight: 700;
  color: var(--signal);
  letter-spacing: -0.03em;
}

.page-disclaimer .clause-title {
  margin: 0 0 8px;
  font-size: clamp(19px, 2.6vw, 25px);
  line-height: 1.28;
  letter-spacing: -0.015em;
  color: var(--white);
}

.page-disclaimer .clause-lead {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--disc-text-soft);
}

.page-disclaimer .clause-list {
  display: grid;
  gap: 10px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.page-disclaimer .clause-list li {
  position: relative;
  padding-left: 16px;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(232, 238, 247, 0.86);
}

.page-disclaimer .clause-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.74em;
  width: 8px;
  height: 2px;
  background: var(--grid);
}

.page-disclaimer .clause-list--warn li::before {
  background: var(--amber);
}

.page-disclaimer .clause-list .tag {
  margin-right: 8px;
  vertical-align: 1px;
}

.page-disclaimer .usage-mail {
  word-break: break-all;
  color: var(--white);
}

.page-disclaimer .clause-split {
  display: grid;
  gap: 16px;
  margin-top: 18px;
}

.page-disclaimer .clause-sub {
  margin: 0;
  padding-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--grid);
  border-bottom: 1px solid var(--line);
}

.page-disclaimer .clause-split .clause-list {
  margin-top: 12px;
}

.page-disclaimer .clause-more {
  margin-top: 20px;
  border-top: 1px dashed var(--line-strong);
}

.page-disclaimer .clause-more summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 0 4px;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--amber);
  list-style: none;
}

.page-disclaimer .clause-more summary::-webkit-details-marker {
  display: none;
}

.page-disclaimer .clause-more summary::after {
  content: "+";
  flex: none;
  font-size: 16px;
  line-height: 1;
}

.page-disclaimer .clause-more[open] summary::after {
  content: "−";
}

.page-disclaimer .clause-more summary:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 3px;
}

.page-disclaimer .clause-more-body {
  display: grid;
  gap: 10px;
  padding: 8px 0 4px;
}

.page-disclaimer .clause-more-body p {
  margin: 0;
  font-size: 13.8px;
  line-height: 1.85;
  color: rgba(232, 238, 247, 0.72);
}

/* ---------- 底部联系 ---------- */
.page-disclaimer .usage-close {
  padding: var(--disc-pad) 0;
  background: var(--cream);
  color: var(--ink);
  border-top: 3px solid var(--signal);
}

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

.page-disclaimer .usage-close-eyebrow {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.2em;
  color: var(--ink);
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(28, 23, 18, 0.24);
}

.page-disclaimer .usage-close-title {
  margin: 0 0 14px;
  font-size: clamp(23px, 3.6vw, 36px);
  line-height: 1.16;
  letter-spacing: -0.025em;
  color: var(--ink);
  text-wrap: balance;
}

.page-disclaimer .usage-close-text {
  margin: 0 0 18px;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(28, 23, 18, 0.78);
}

.page-disclaimer .usage-close-note {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  padding: 12px 14px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink);
  background: rgba(28, 23, 18, 0.06);
  border-left: 3px solid var(--green);
}

.page-disclaimer .usage-close-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-disclaimer .usage-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 20px;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.3;
  text-align: center;
  text-decoration: none;
  color: #17090A;
  background: var(--signal);
  border: 1px solid var(--signal);
  border-radius: var(--radius);
  transition: background-color 180ms ease, border-color 180ms ease, color 180ms ease;
}

.page-disclaimer .usage-cta:hover,
.page-disclaimer .usage-cta:focus-visible {
  background: var(--signal-hot);
  border-color: var(--signal-hot);
}

.page-disclaimer .usage-cta--line {
  color: var(--ink);
  background: transparent;
  border-color: rgba(28, 23, 18, 0.4);
}

.page-disclaimer .usage-cta--line:hover,
.page-disclaimer .usage-cta--line:focus-visible {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--cream);
}

.page-disclaimer .usage-close-minor {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin-top: 6px;
  padding-top: 14px;
  border-top: 1px solid rgba(28, 23, 18, 0.2);
}

.page-disclaimer .usage-link {
  font-size: 13.5px;
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-disclaimer .usage-link:hover,
.page-disclaimer .usage-link:focus-visible {
  color: var(--signal);
}

/* ---------- 窄屏适配 ---------- */
@media (max-width: 420px) {
  .page-disclaimer .usage-rail-item {
    flex-wrap: wrap;
    gap: 6px 10px;
  }

  .page-disclaimer .clause-head {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .page-disclaimer .clause-num {
    font-size: 24px;
  }
}

/* ---------- 中等屏 ---------- */
@media (min-width: 700px) {
  .page-disclaimer .usage-rail {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-disclaimer .usage-rail-item {
    padding: 12px 16px;
    border-bottom: 0;
  }

  .page-disclaimer .usage-rail-item:nth-child(odd) {
    border-right: 1px dashed var(--line);
  }

  .page-disclaimer .usage-rail-item:nth-child(-n + 2) {
    border-bottom: 1px dashed var(--line);
  }

  .page-disclaimer .usage-figure img {
    aspect-ratio: 21 / 9;
  }

  .page-disclaimer .clause-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 22px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-disclaimer .usage-rail {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-disclaimer .usage-rail-item {
    border-bottom: 0;
    border-right: 1px dashed var(--line);
  }

  .page-disclaimer .usage-rail-item:last-child {
    border-right: 0;
  }

  .page-disclaimer .usage-hero-head {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    grid-template-areas:
      "eyebrow eyebrow"
      "title lead";
    column-gap: clamp(28px, 5vw, 64px);
    align-items: end;
  }

  .page-disclaimer .usage-hero-head .eyebrow {
    grid-area: eyebrow;
  }

  .page-disclaimer .usage-hero-head h1.display {
    grid-area: title;
  }

  .page-disclaimer .usage-hero-head .usage-lead {
    grid-area: lead;
    padding-bottom: 6px;
  }

  .page-disclaimer .usage-layout {
    grid-template-columns: 262px minmax(0, 1fr);
    align-items: start;
  }

  .page-disclaimer .usage-toc {
    position: sticky;
    top: 24px;
  }

  .page-disclaimer .usage-close-inner {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-disclaimer .usage-close-actions {
    padding-top: 8px;
  }
}

/* ---------- 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-disclaimer .usage-lamp {
    animation: none;
  }

  .page-disclaimer .usage-toc-link,
  .page-disclaimer .usage-cta,
  .page-disclaimer .clause {
    transition: none;
  }
}