/* =========================================================
   使用说明页 /usage/
   ========================================================= */

.page-disclaimer {
  --u-tint: rgba(61, 255, 158, 0.08);
  display: block;
}

/* ---------- 面包屑 ---------- */
.page-disclaimer .usage-crumb {
  padding-top: var(--sp-3);
}

/* ---------- 页头 ---------- */
.page-disclaimer .usage-head {
  display: grid;
  gap: var(--sp-2);
  padding-top: clamp(1.5rem, 4vw, 3.5rem);
  padding-bottom: clamp(1.25rem, 3vw, 2.25rem);
}

.page-disclaimer .usage-head .eyebrow {
  margin: 0;
}

.page-disclaimer .usage-head .h1 {
  margin: 0;
  letter-spacing: -0.015em;
}

.page-disclaimer .usage-head .lede {
  margin: 0;
  max-width: 44rem;
}

.page-disclaimer .usage-head__meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--mute);
}

/* ---------- 首图 ---------- */
.page-disclaimer .usage-figure {
  margin: 0;
  padding-bottom: clamp(1.5rem, 4vw, 3rem);
}

.page-disclaimer .usage-figure .media-frame {
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
}

.page-disclaimer .usage-figure .media-frame__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-disclaimer .usage-figure .figure__cap {
  margin-top: 0.875rem;
  margin-bottom: 0;
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--mute);
  max-width: 44rem;
}

/* ---------- 区块骨架 ---------- */
.page-disclaimer .usage-sec {
  padding-top: clamp(2rem, 5vw, 3.75rem);
  padding-bottom: clamp(1rem, 2.5vw, 1.5rem);
}

.page-disclaimer .usage-sec__head {
  max-width: 46rem;
  margin-bottom: clamp(1.25rem, 3vw, 2rem);
}

.page-disclaimer .usage-sec__head .eyebrow {
  margin: 0 0 0.6rem;
}

.page-disclaimer .usage-sec__head .h2 {
  margin: 0 0 0.75rem;
  letter-spacing: -0.01em;
}

.page-disclaimer .usage-sec__lead {
  margin: 0;
  font-size: 1rem;
  line-height: 1.75;
  color: var(--frost);
  max-width: 40rem;
}

.page-disclaimer .usage-sec__lead a {
  color: var(--green);
  text-decoration: underline;
  text-underline-offset: 0.2em;
  text-decoration-thickness: 1px;
  transition: text-decoration-thickness 120ms ease;
}

.page-disclaimer .usage-sec__lead a:hover,
.page-disclaimer .usage-sec__lead a:focus-visible {
  text-decoration-thickness: 2px;
}

/* ---------- 条款列表 ---------- */
.page-disclaimer .usage-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-disclaimer .usage-item {
  display: grid;
  grid-template-columns: 2.5rem minmax(0, 1fr);
  gap: 0 0.5rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--line);
}

.page-disclaimer .usage-item__no {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  line-height: 1.95;
  color: var(--green);
}

.page-disclaimer .usage-item__text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--frost);
  max-width: 38em;
}

.page-disclaimer .usage-item__text a {
  color: var(--green);
  text-decoration: underline;
  text-underline-offset: 0.2em;
  text-decoration-thickness: 1px;
  transition: text-decoration-thickness 120ms ease;
}

.page-disclaimer .usage-item__text a:hover,
.page-disclaimer .usage-item__text a:focus-visible {
  text-decoration-thickness: 2px;
}

/* ---------- 轮次刻度 ---------- */
.page-disclaimer .usage-scale-block {
  margin-top: clamp(1.5rem, 3.5vw, 2.5rem);
  padding-top: clamp(1rem, 2.5vw, 1.5rem);
  border-top: 1px solid var(--line);
}

.page-disclaimer .usage-scale {
  display: block;
  width: 100%;
  max-width: 44rem;
  height: auto;
}

.page-disclaimer .usage-scale .scale-line,
.page-disclaimer .usage-scale .scale-tick {
  stroke: var(--line);
  stroke-width: 1;
}

.page-disclaimer .usage-scale .scale-node {
  fill: var(--green);
}

.page-disclaimer .usage-scale .scale-node--start {
  fill: var(--orange);
}

.page-disclaimer .usage-scale .scale-node--end {
  fill: var(--white);
}

.page-disclaimer .usage-scale .scale-label {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  fill: var(--mute);
}

.page-disclaimer .usage-scale__cap {
  margin: 0.75rem 0 0;
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--mute);
  max-width: 40rem;
}

/* ---------- 横向说明带 ---------- */
.page-disclaimer .usage-band {
  margin-top: clamp(1.75rem, 4vw, 3rem);
  padding: clamp(1.75rem, 4vw, 3rem) 0;
  background: var(--stand);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-disclaimer .usage-band__title {
  margin: 0 0 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--teal);
}

.page-disclaimer .usage-band__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem 1rem;
}

.page-disclaimer .usage-band__item {
  min-width: 0;
  padding-left: 0.875rem;
  border-left: 1px solid var(--line);
}

.page-disclaimer .usage-band__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.05rem, 3vw, 1.35rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.25;
  color: var(--white);
}

.page-disclaimer .usage-band__label {
  display: block;
  margin-top: 0.35rem;
  font-size: 0.8125rem;
  line-height: 1.65;
  color: var(--mute);
}

/* ---------- 收束 ---------- */
.page-disclaimer .usage-tail {
  display: grid;
  gap: 1.25rem;
  padding-top: clamp(2rem, 5vw, 3.5rem);
  padding-bottom: clamp(2.5rem, 6vw, 4.5rem);
}

.page-disclaimer .usage-tail__text {
  margin: 0;
  font-size: 1rem;
  line-height: 1.75;
  color: var(--frost);
  max-width: 40rem;
}

.page-disclaimer .usage-tail__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* ---------- 断点 ---------- */
@media (min-width: 700px) {
  .page-disclaimer .usage-item {
    grid-template-columns: 3.5rem minmax(0, 1fr);
    gap: 0 1rem;
    padding: 1.125rem 0;
  }

  .page-disclaimer .usage-band__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1.5rem;
  }
}

@media (min-width: 1024px) {
  .page-disclaimer .usage-sec {
    display: grid;
    grid-template-columns: minmax(0, 4.5fr) minmax(0, 7.5fr);
    column-gap: clamp(2rem, 5vw, 5rem);
    align-items: start;
  }

  .page-disclaimer .usage-sec__head {
    max-width: none;
    margin-bottom: 0;
  }

  .page-disclaimer .usage-scale {
    max-width: 100%;
  }

  .page-disclaimer .usage-item__text {
    font-size: 1rem;
  }
}