.page-disclaimer {
  --u-hair: rgba(199, 208, 204, 0.18);
  --u-hair-strong: rgba(199, 208, 204, 0.34);
  --u-muted: rgba(199, 208, 204, 0.8);
  background: var(--ink);
  color: var(--paper);
}

/* ---------- 首屏 ---------- */

.page-disclaimer .usage-hero {
  position: relative;
  overflow: hidden;
  padding: 44px 0 40px;
  background:
    linear-gradient(118deg, rgba(11, 43, 38, 0) 0 58%, rgba(255, 106, 19, 0.13) 58% 100%),
    linear-gradient(212deg, rgba(77, 240, 208, 0.07) 0 13%, rgba(11, 43, 38, 0) 13% 100%),
    var(--ink);
  border-bottom: 1px solid var(--u-hair);
}

.page-disclaimer .usage-hero__inner {
  display: grid;
  gap: 18px;
}

.page-disclaimer .usage-hero__eyebrow {
  margin: 0;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-disclaimer .usage-hero__title {
  margin: 0;
  max-width: 20ch;
  font-family: var(--font-display);
  font-size: clamp(30px, 7vw, 56px);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-disclaimer .usage-hero__lead {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.82;
  color: var(--u-muted);
}

.page-disclaimer .usage-hero__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 6px 0 0;
  padding: 0;
  list-style: none;
}

/* ---------- 步骤进度条 ---------- */

.page-disclaimer .usage-track {
  background: var(--ink-2);
  border-bottom: 1px solid var(--u-hair);
  padding: 12px 0;
}

.page-disclaimer .usage-track__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 2px;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  scrollbar-width: thin;
}

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

.page-disclaimer .usage-track__link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 9px 16px;
  border: 1px solid var(--u-hair);
  color: var(--silver);
  font-size: 13.5px;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-disclaimer .usage-track__link:hover,
.page-disclaimer .usage-track__link:focus-visible {
  border-color: var(--orange);
  color: var(--paper);
  background: var(--glass);
  outline: none;
}

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

.page-disclaimer .usage-track__num {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

/* ---------- 主布局 ---------- */

.page-disclaimer .usage-layout {
  display: grid;
  gap: 40px;
  padding-top: 44px;
  padding-bottom: 84px;
}

.page-disclaimer .usage-rail {
  min-width: 0;
}

.page-disclaimer .usage-rail__title {
  margin: 0 0 14px;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-disclaimer .usage-rail__list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-disclaimer .usage-rail__link {
  display: grid;
  grid-template-columns: 30px 1fr;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-left: 2px solid var(--u-hair);
  color: var(--silver);
  font-size: 14px;
  line-height: 1.4;
  text-decoration: none;
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-disclaimer .usage-rail__link:hover {
  color: var(--paper);
  background: var(--glass);
}

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

.page-disclaimer .usage-rail__link[aria-current="true"] {
  color: var(--paper);
  background: var(--glass);
  border-left-color: var(--orange);
}

.page-disclaimer .usage-rail__num {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-disclaimer .usage-flow {
  display: grid;
  gap: 64px;
  min-width: 0;
}

/* ---------- 步骤 ---------- */

.page-disclaimer .usage-step {
  min-width: 0;
  scroll-margin-top: 120px;
}

.page-disclaimer .usage-step__head {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 22px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--u-hair-strong);
}

.page-disclaimer .usage-step__num {
  font-size: 26px;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--orange);
}

.page-disclaimer .usage-step__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(21px, 3.6vw, 30px);
  font-weight: 900;
  line-height: 1.26;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-disclaimer .usage-step__text {
  margin: 0 0 6px;
  max-width: 66ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--u-muted);
}

.page-disclaimer .usage-ops {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-disclaimer .usage-ops__item {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 14px;
  padding: 18px 0;
  border-top: 1px solid var(--u-hair);
}

.page-disclaimer .usage-ops__item:last-child {
  border-bottom: 1px solid var(--u-hair);
}

.page-disclaimer .usage-ops__num {
  padding-top: 4px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-disclaimer .usage-ops__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-disclaimer .usage-ops__text {
  margin: 0;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--u-muted);
}

/* ---------- 键盘提示条 ---------- */

.page-disclaimer .usage-keys {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 18px;
  margin-top: 26px;
  padding: 14px 18px;
  background: var(--glass);
  border-left: 3px solid var(--orange);
  font-size: 13.5px;
  color: var(--silver);
}

.page-disclaimer .usage-keys__label {
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--orange-2);
}

.page-disclaimer .usage-keys kbd {
  padding: 3px 7px;
  border: 1px solid var(--u-hair-strong);
  border-radius: var(--radius);
  background: rgba(0, 0, 0, 0.28);
  font-family: var(--font-data);
  font-size: 12px;
  line-height: 1.2;
  color: var(--paper);
}

/* ---------- 图 ---------- */

.page-disclaimer .usage-figure {
  margin: 30px 0 0;
}

.page-disclaimer .usage-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 12 / 5;
  object-fit: cover;
  border: 1px solid var(--u-hair);
}

.page-disclaimer .usage-figure__caption {
  margin: 10px 0 0;
  font-family: var(--font-data);
  font-size: 12.5px;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: rgba(199, 208, 204, 0.66);
}

/* ---------- 折叠 ---------- */

.page-disclaimer .usage-fold {
  margin-top: 26px;
  border: 1px solid var(--u-hair);
  background: var(--ink-2);
}

.page-disclaimer .usage-fold > summary {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 18px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--paper);
}

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

.page-disclaimer .usage-fold > summary::before {
  content: "+";
  font-family: var(--font-data);
  font-size: 16px;
  line-height: 1;
  color: var(--orange);
}

.page-disclaimer .usage-fold[open] > summary::before {
  content: "–";
}

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

.page-disclaimer .usage-fold__body {
  padding: 0 18px 18px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--u-muted);
}

.page-disclaimer .usage-fold__body ul {
  display: grid;
  gap: 8px;
  margin: 0;
  padding-left: 18px;
}

/* ---------- 返水周期 ---------- */

.page-disclaimer .usage-cycles {
  display: grid;
  gap: 1px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  background: var(--u-hair);
  border: 1px solid var(--u-hair);
}

.page-disclaimer .usage-cycles__item {
  display: grid;
  gap: 12px;
  padding: 20px;
  background: var(--ink);
}

.page-disclaimer .usage-cycles__tag {
  justify-self: start;
  align-self: start;
  padding: 5px 12px;
  background: var(--orange);
  color: var(--ink);
  font-family: var(--font-data);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.page-disclaimer .usage-cycles__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-disclaimer .usage-cycles__text {
  margin: 0;
  max-width: 58ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--u-muted);
}

/* ---------- 积分档位 ---------- */

.page-disclaimer .usage-tiers {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  background: var(--u-hair);
  border: 1px solid var(--u-hair);
}

.page-disclaimer .usage-tiers__item {
  display: grid;
  gap: 8px;
  align-content: start;
  padding: 22px 20px;
  background: var(--ink-2);
}

.page-disclaimer .usage-tiers__idx {
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-disclaimer .usage-tiers__name {
  margin: 0;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 900;
  letter-spacing: 0.03em;
  color: var(--paper);
}

.page-disclaimer .usage-tiers__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--u-muted);
}

/* ---------- 版本说明（纸白层） ---------- */

.page-disclaimer .usage-paper {
  margin-top: 24px;
  padding: 26px 22px;
  background: var(--paper);
  color: var(--charcoal);
}

.page-disclaimer .usage-paper h3 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 900;
  letter-spacing: 0.02em;
  color: var(--charcoal);
}

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

.page-disclaimer .usage-paper li {
  position: relative;
  padding-left: 20px;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--charcoal);
}

.page-disclaimer .usage-paper li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 2px;
  background: var(--orange);
}

/* ---------- 数据条 ---------- */

.page-disclaimer .usage-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 22px 0 0;
  padding: 0;
  background: var(--u-hair);
  border: 1px solid var(--u-hair);
}

.page-disclaimer .usage-facts__item {
  margin: 0;
  padding: 18px 16px;
  background: var(--ink);
}

.page-disclaimer .usage-facts dt {
  margin-bottom: 8px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--u-muted);
}

.page-disclaimer .usage-facts dd {
  margin: 0;
  font-size: 18px;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

/* ---------- 收尾 ---------- */

.page-disclaimer .usage-outro {
  padding: 30px 22px;
  border-top: 3px solid var(--orange);
  background:
    linear-gradient(90deg, rgba(255, 106, 19, 0.12) 0%, rgba(18, 59, 51, 0) 58%),
    var(--ink-2);
}

.page-disclaimer .usage-outro__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(20px, 3.4vw, 28px);
  font-weight: 900;
  line-height: 1.28;
  color: var(--paper);
}

.page-disclaimer .usage-outro__text {
  margin: 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--u-muted);
}

.page-disclaimer .usage-outro__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.page-disclaimer .usage-outro__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin: 24px 0 0;
  padding: 18px 0 0;
  list-style: none;
  border-top: 1px solid var(--u-hair);
  font-size: 14px;
}

.page-disclaimer .usage-outro__links a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease);
}

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

/* ---------- 响应式 ---------- */

@media (min-width: 520px) and (max-width: 959px) {
  .page-disclaimer .usage-rail__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 680px) {
  .page-disclaimer .usage-cycles__item {
    grid-template-columns: 84px 1fr;
    gap: 24px;
    align-items: start;
  }

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

  .page-disclaimer .usage-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-disclaimer .usage-layout {
    grid-template-columns: minmax(210px, 3fr) 9fr;
    gap: 56px;
    padding-top: 72px;
    padding-bottom: 120px;
  }

  .page-disclaimer .usage-rail {
    position: sticky;
    top: 120px;
    align-self: start;
  }

  .page-disclaimer .usage-flow {
    gap: 88px;
  }

  .page-disclaimer .usage-hero {
    padding: 64px 0 52px;
  }

  .page-disclaimer .usage-outro {
    padding: 38px 32px;
  }
}

@media (max-width: 599px) {
  .page-disclaimer .usage-hero {
    padding: 34px 0 30px;
  }

  .page-disclaimer .usage-layout {
    padding-top: 34px;
    padding-bottom: 62px;
  }

  .page-disclaimer .usage-flow {
    gap: 52px;
  }

  .page-disclaimer .usage-step__num {
    font-size: 22px;
  }

  .page-disclaimer .usage-paper,
  .page-disclaimer .usage-outro {
    padding: 22px 16px;
  }

  .page-disclaimer .usage-keys {
    padding: 12px 14px;
  }
}
<<<END>>>