.page-disclaimer {
  --u-line: rgba(201, 209, 217, 0.18);
  --u-line-strong: rgba(201, 209, 217, 0.34);
  --u-ink-soft: rgba(58, 42, 34, 0.72);
  --u-card-shadow: 5px 5px 0 rgba(58, 42, 34, 0.85);
  background: var(--ink);
  color: var(--white);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-disclaimer *,
.page-disclaimer *::before,
.page-disclaimer *::after {
  box-sizing: border-box;
}

.page-disclaimer .crumbs {
  padding-top: clamp(14px, 2.4vw, 24px);
  padding-bottom: clamp(6px, 1.4vw, 12px);
}

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

.page-disclaimer .crumbs__list li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--red);
}

.page-disclaimer .crumbs__list a {
  color: var(--silver);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-disclaimer .crumbs__list a:hover,
.page-disclaimer .crumbs__list a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-disclaimer .crumbs__list [aria-current="page"] {
  color: var(--amber);
}

/* ---------- 首屏 ---------- */

.page-disclaimer .usage-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(22px, 4vw, 46px) 0 clamp(30px, 5vw, 58px);
  border-bottom: var(--edge) solid var(--brown);
  background:
    radial-gradient(circle at 88% 8%, rgba(24, 214, 208, 0.12), transparent 46%),
    linear-gradient(118deg, rgba(225, 37, 27, 0.18), transparent 46%),
    var(--ink);
}

.page-disclaimer .usage-hero::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: min(46%, 540px);
  height: 6px;
  background: linear-gradient(90deg, var(--red), var(--ember), var(--amber));
}

.page-disclaimer .usage-hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 40px);
  align-items: start;
}

.page-disclaimer .usage-hero__copy h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 7.4vw, 64px);
  line-height: 0.98;
  letter-spacing: -0.02em;
  margin: 14px 0 18px;
  color: var(--white);
}

.page-disclaimer .usage-hero__copy .lead {
  color: var(--silver);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.72;
  max-width: 46ch;
  margin: 0;
}

.page-disclaimer .usage-hero__facts {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.03em;
  color: var(--silver);
}

.page-disclaimer .usage-hero__facts li {
  border-left: 3px solid var(--amber);
  padding-left: 11px;
  line-height: 1.5;
}

.page-disclaimer .usage-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-disclaimer .usage-hero__figure {
  margin: 0;
  border: var(--edge) solid var(--brown);
  background: var(--panel);
  box-shadow: var(--u-card-shadow);
}

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

.page-disclaimer .usage-hero__figure .figure__caption {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--silver);
  border-top: 1px solid var(--u-line);
  padding: 9px 12px;
}

/* ---------- 章节快捷定位 ---------- */

.page-disclaimer .usage-index {
  background: var(--ink-2);
  border-bottom: var(--edge) solid var(--brown);
}

.page-disclaimer .usage-index__list {
  display: flex;
  overflow-x: auto;
  list-style: none;
  margin: 0;
  padding: 0;
  scrollbar-width: thin;
}

.page-disclaimer .usage-index__list li {
  flex: 0 0 auto;
}

.page-disclaimer .usage-index__list a {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  white-space: nowrap;
  color: var(--silver);
  text-decoration: none;
  border-right: 1px solid var(--u-line);
  transition: color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-disclaimer .usage-index__no {
  color: var(--amber);
  font-weight: 700;
}

.page-disclaimer .usage-index__list a:hover,
.page-disclaimer .usage-index__list a:focus-visible {
  color: var(--ink);
  background: var(--cyan);
}

.page-disclaimer .usage-index__list a:hover .usage-index__no,
.page-disclaimer .usage-index__list a:focus-visible .usage-index__no {
  color: var(--ink);
}

/* ---------- 章节通用 ---------- */

.page-disclaimer .usage-chapter {
  padding: clamp(30px, 5vw, 60px) 0;
  border-bottom: var(--edge) solid rgba(58, 42, 34, 0.9);
  scroll-margin-top: 92px;
}

.page-disclaimer .usage-chapter__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(12px, 2vw, 20px);
  align-items: start;
  margin-bottom: clamp(16px, 2.4vw, 26px);
}

.page-disclaimer .usage-chapter__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 4vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--amber);
}

.page-disclaimer .usage-chapter .eyebrow {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ember);
  margin-bottom: 6px;
}

.page-disclaimer .usage-chapter__title {
  font-family: var(--font-display);
  font-size: clamp(22px, 3.4vw, 32px);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.01em;
  margin: 0;
  color: var(--white);
}

.page-disclaimer .usage-prose p {
  color: var(--silver);
  font-size: 16px;
  line-height: 1.72;
  margin: 0 0 14px;
  max-width: 62ch;
}

.page-disclaimer .usage-prose p:last-child {
  margin-bottom: 0;
}

.page-disclaimer .usage-list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 11px;
}

.page-disclaimer .usage-list li {
  position: relative;
  padding-left: 22px;
  color: var(--silver);
  font-size: 15.5px;
  line-height: 1.62;
  max-width: 64ch;
}

.page-disclaimer .usage-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 9px;
  height: 9px;
  background: var(--red);
  transform: rotate(45deg);
}

.page-disclaimer .usage-list strong {
  color: var(--white);
  font-weight: 700;
}

.page-disclaimer .usage-note {
  margin: 20px 0 0;
  background: var(--cream);
  color: var(--brown);
  border: var(--edge) solid var(--brown);
  border-left: 8px solid var(--ember);
  padding: 14px 16px;
  font-size: 14.5px;
  line-height: 1.64;
  max-width: 70ch;
  box-shadow: 4px 4px 0 rgba(11, 14, 19, 0.6);
}

.page-disclaimer .usage-note__k {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--red);
  border: 1px solid currentColor;
  padding: 1px 6px;
  margin-right: 8px;
  transform: translateY(-1px);
}

/* ---------- 索引说明表 ---------- */

.page-disclaimer .usage-meta {
  margin: 18px 0 0;
  border: var(--edge) solid var(--brown);
  background: var(--ink-2);
}

.page-disclaimer .usage-meta__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 3px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--u-line);
}

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

.page-disclaimer .usage-meta dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.page-disclaimer .usage-meta dd {
  margin: 0;
  color: var(--white);
  font-size: 15px;
  line-height: 1.55;
}

/* ---------- 四步换设备 ---------- */

.page-disclaimer .usage-steps {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-disclaimer .usage-step {
  position: relative;
  background: var(--panel);
  border: var(--edge) solid var(--brown);
  box-shadow: var(--u-card-shadow);
  padding: 18px 20px 18px 60px;
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-disclaimer .usage-step:hover {
  border-color: var(--ember);
}

.page-disclaimer .usage-step__check {
  position: absolute;
  left: 18px;
  top: 22px;
  width: 22px;
  height: 22px;
  margin: 0;
  appearance: none;
  -webkit-appearance: none;
  border: 2px solid var(--amber);
  background: rgba(11, 14, 19, 0.7);
  border-radius: 0;
  cursor: pointer;
  transition: background-color 0.18s var(--ease), box-shadow 0.18s var(--ease);
}

.page-disclaimer .usage-step__check:checked {
  background: var(--amber);
  box-shadow: inset 0 0 0 3px var(--ink-2);
}

.page-disclaimer .usage-step__check:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-disclaimer .usage-step__no {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--amber);
  margin-bottom: 4px;
}

.page-disclaimer .usage-step__title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.25;
  margin: 0 0 7px;
  color: var(--white);
  transition: color 0.2s var(--ease);
}

.page-disclaimer .usage-step__desc {
  margin: 0;
  color: var(--silver);
  font-size: 14.5px;
  line-height: 1.62;
  max-width: 60ch;
}

.page-disclaimer .usage-step__check:checked ~ .usage-step__body .usage-step__title {
  color: var(--cyan);
}

/* ---------- 联系方式 ---------- */

.page-disclaimer .usage-contact {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 20px;
}

.page-disclaimer .usage-contact__card {
  background: var(--cream);
  color: var(--brown);
  border: var(--edge) solid var(--brown);
  box-shadow: var(--u-card-shadow);
  padding: 16px 18px;
}

.page-disclaimer .usage-contact__k {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--red);
  margin-bottom: 8px;
}

.page-disclaimer .usage-contact__v {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--brown);
  word-break: break-word;
  user-select: all;
}

.page-disclaimer .usage-contact__h {
  margin: 0;
  font-size: 13px;
  line-height: 1.55;
  color: var(--u-ink-soft);
}

.page-disclaimer .usage-address {
  margin-top: 14px;
  background: var(--ink-2);
  border: var(--edge) solid var(--brown);
  border-left: 8px solid var(--red);
  padding: 16px 18px;
}

.page-disclaimer .usage-address__k {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--amber);
  margin-bottom: 8px;
}

.page-disclaimer .usage-address__v {
  margin: 0 0 8px;
  font-size: 15px;
  line-height: 1.6;
  color: var(--white);
}

.page-disclaimer .usage-address__h {
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--silver);
  max-width: 70ch;
}

/* ---------- 延伸入口 ---------- */

.page-disclaimer .usage-next {
  padding: clamp(30px, 5vw, 58px) 0 clamp(36px, 5vw, 64px);
}

.page-disclaimer .usage-next__title {
  font-family: var(--font-display);
  font-size: clamp(20px, 2.8vw, 26px);
  font-weight: 800;
  letter-spacing: -0.01em;
  margin: 0 0 18px;
  color: var(--white);
}

.page-disclaimer .usage-next__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-disclaimer .usage-next__link {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  border: var(--edge) solid var(--brown);
  background: var(--ink-2);
  text-decoration: none;
  transition: background-color 0.2s var(--ease), border-color 0.2s var(--ease),
    transform 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.page-disclaimer .usage-next__link:hover,
.page-disclaimer .usage-next__link:focus-visible {
  background: var(--red);
  border-color: var(--red);
  transform: translate(-2px, -2px);
  box-shadow: var(--u-card-shadow);
}

.page-disclaimer .usage-next__k {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--amber);
  flex: 0 0 auto;
}

.page-disclaimer .usage-next__link:hover .usage-next__k,
.page-disclaimer .usage-next__link:focus-visible .usage-next__k {
  color: var(--white);
}

.page-disclaimer .usage-next__v {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--white);
}

.page-disclaimer .usage-next__print {
  margin: 22px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  color: var(--silver);
  border-top: 1px dashed var(--u-line-strong);
  padding-top: 14px;
  max-width: 68ch;
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-disclaimer .usage-meta__row {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 16px;
    align-items: baseline;
  }

  .page-disclaimer .usage-next__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-disclaimer .usage-contact {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-disclaimer .usage-hero__inner {
    grid-template-columns: minmax(0, 1.04fr) minmax(0, 0.96fr);
    align-items: start;
  }

  .page-disclaimer .usage-hero__figure {
    margin-top: 6px;
  }

  .page-disclaimer .usage-chapter {
    padding-right: clamp(0px, 2vw, 24px);
  }
}

@media (min-width: 1080px) {
  .page-disclaimer .usage-next__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-disclaimer .usage-prose,
  .page-disclaimer .usage-list {
    max-width: 76ch;
  }
}

/* ---------- 打印 ---------- */

@media print {
  .page-disclaimer {
    background: #ffffff;
    color: #111111;
  }

  .page-disclaimer .usage-hero {
    background: none;
    border-bottom: 2px solid #111111;
    padding: 0 0 12px;
  }

  .page-disclaimer .usage-hero::after,
  .page-disclaimer .usage-index,
  .page-disclaimer .usage-hero__actions,
  .page-disclaimer .usage-hero__figure {
    display: none;
  }

  .page-disclaimer .usage-hero__copy h1,
  .page-disclaimer .usage-chapter__title,
  .page-disclaimer .usage-step__title,
  .page-disclaimer .usage-next__title,
  .page-disclaimer .usage-address__v {
    color: #111111;
  }

  .page-disclaimer .usage-hero__copy .lead,
  .page-disclaimer .usage-prose p,
  .page-disclaimer .usage-list li,
  .page-disclaimer .usage-step__desc,
  .page-disclaimer .usage-hero__facts,
  .page-disclaimer .usage-next__print {
    color: #333333;
  }

  .page-disclaimer .usage-chapter {
    border-bottom: 1px solid #999999;
    padding: 14px 0;
    break-inside: avoid;
  }

  .page-disclaimer .usage-step {
    background: none;
    border: 1px solid #666666;
    box-shadow: none;
  }

  .page-disclaimer .usage-note {
    background: none;
    border: 1px solid #666666;
    border-left: 4px solid #666666;
    box-shadow: none;
  }

  .page-disclaimer .usage-contact__card,
  .page-disclaimer .usage-address,
  .page-disclaimer .usage-next__link {
    background: none;
    border: 1px solid #666666;
    box-shadow: none;
  }

  .page-disclaimer .usage-step__check {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-disclaimer .usage-step,
  .page-disclaimer .usage-next__link,
  .page-disclaimer .usage-step__title,
  .page-disclaimer .usage-step__check {
    transition: none;
  }
}