/* ===== 使用指引 /usage/ · 页面作用域 ===== */
.page-disclaimer {
  --u-num-size: clamp(2.1rem, 5.2vw, 3.6rem);
  --u-pad-y: clamp(40px, 5.6vw, 72px);
  --u-dim: rgba(245, 242, 234, .28);
  color: var(--paper);
  background: var(--ink);
}

/* ---------- 页头 ---------- */
.page-disclaimer .usage-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(58% 78% at 88% 6%, rgba(47, 230, 200, .13), transparent 62%),
    radial-gradient(52% 70% at 4% 96%, rgba(124, 92, 255, .16), transparent 60%),
    linear-gradient(180deg, var(--ink-3) 0%, var(--ink) 100%);
}

.page-disclaimer .usage-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: .5;
  background-image:
    linear-gradient(90deg, rgba(245, 242, 234, .05) 1px, transparent 1px),
    linear-gradient(180deg, rgba(245, 242, 234, .05) 1px, transparent 1px);
  background-size: 88px 88px;
}

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

.page-disclaimer .usage-hero .breadcrumb {
  padding-top: clamp(20px, 3vw, 32px);
}

.page-disclaimer .usage-hero__grid {
  display: grid;
  gap: clamp(28px, 4vw, 44px);
  padding: clamp(24px, 4vw, 44px) 0 clamp(44px, 6vw, 80px);
}

.page-disclaimer .usage-hero__copy {
  max-width: 62ch;
}

.page-disclaimer .usage-hero h1 {
  margin: 12px 0 0;
  font-size: clamp(2rem, 5.6vw, 3.3rem);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -.015em;
  color: var(--paper);
}

.page-disclaimer .usage-hero__lead {
  margin: 20px 0 0;
  font-size: 16.5px;
  line-height: 1.78;
  color: var(--muted);
}

.page-disclaimer .usage-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.page-disclaimer .usage-hero__visual {
  margin: 0;
  position: relative;
  border: 1px solid var(--glass-line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-2);
  box-shadow: var(--shadow);
}

.page-disclaimer .usage-hero__visual::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(155deg, rgba(47, 230, 200, .18), transparent 42%, rgba(255, 107, 44, .16));
  mix-blend-mode: screen;
}

.page-disclaimer .usage-hero__visual img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
}

/* ---------- 条款目录 ---------- */
.page-disclaimer .usage-jump {
  border-bottom: 1px solid var(--line);
  background: var(--ink-2);
}

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

.page-disclaimer .usage-jump__list li {
  border-top: 1px solid var(--line);
}

.page-disclaimer .usage-jump__list li:first-child {
  border-top: 0;
}

.page-disclaimer .usage-jump__list a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 2px;
  font-size: 14.5px;
  color: var(--muted);
  text-decoration: none;
  transition: color .2s var(--ease), background-color .2s var(--ease);
}

.page-disclaimer .usage-jump__list a .mono {
  font-size: 12px;
  color: var(--cyan);
  letter-spacing: .08em;
}

.page-disclaimer .usage-jump__list a:hover,
.page-disclaimer .usage-jump__list a:focus-visible {
  color: var(--paper);
  background: rgba(245, 242, 234, .04);
}

.page-disclaimer .usage-jump__list a:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: -2px;
}

/* ---------- 条款主体 ---------- */
.page-disclaimer .usage-body {
  padding: clamp(8px, 2vw, 20px) 0 clamp(56px, 8vw, 104px);
}

.page-disclaimer .usage-clause {
  display: grid;
  gap: 14px;
  padding-top: var(--u-pad-y);
  padding-bottom: var(--u-pad-y);
  scroll-margin-top: 110px;
}

.page-disclaimer .usage-clause__num {
  appearance: none;
  border: 0;
  background: transparent;
  padding: 0;
  margin: 0;
  font-family: var(--mono);
  font-size: var(--u-num-size);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  text-align: left;
  color: rgba(245, 242, 234, .2);
  cursor: pointer;
  transition: color .22s var(--ease);
}

.page-disclaimer .usage-clause__num:hover {
  color: var(--orange);
}

.page-disclaimer .usage-clause__num:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 6px;
  color: var(--orange);
}

.page-disclaimer .usage-clause__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

.page-disclaimer .usage-clause__head h2 {
  margin: 0;
  font-size: clamp(1.35rem, 3.2vw, 1.9rem);
  font-weight: 800;
  line-height: 1.24;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-disclaimer .usage-clause__head .tag {
  flex: none;
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--muted);
  border: 1px solid var(--line-strong);
  background: transparent;
}

.page-disclaimer .usage-clause__main p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 46ch;
}

.page-disclaimer .usage-clause__main p a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 230, 200, .42);
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-disclaimer .usage-clause__main p a:hover,
.page-disclaimer .usage-clause__main p a:focus-visible {
  color: var(--paper);
  border-color: var(--paper);
}

.page-disclaimer .usage-clause__note {
  margin: 0;
  padding: 14px 16px;
  border-left: 2px solid var(--amber);
  background: rgba(255, 194, 75, .06);
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(245, 242, 234, .78);
  max-width: 62ch !important;
}

.page-disclaimer .usage-clause__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* ---------- 分隔刻度带 ---------- */
.page-disclaimer .usage-rule {
  height: 8px;
  border-top: 1px solid var(--line);
  background-image: repeating-linear-gradient(
    90deg,
    rgba(245, 242, 234, .3) 0 1px,
    transparent 1px 20px
  );
  background-size: 100% 7px;
  background-position: left top;
  background-repeat: no-repeat;
}

/* ---------- 使用场景三栏 ---------- */
.page-disclaimer .usage-scenes {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 22px 0 22px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-disclaimer .usage-scenes__item {
  padding: 18px 18px 20px;
  background: var(--ink-2);
}

.page-disclaimer .usage-scenes__item h3 {
  margin: 0 0 8px;
  font-size: 15.5px;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: .01em;
}

.page-disclaimer .usage-scenes__item p {
  margin: 0 !important;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--muted);
  max-width: none !important;
}

/* ---------- 允许 / 不允许 对比 ---------- */
.page-disclaimer .usage-compare {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin: 22px 0 20px;
}

.page-disclaimer .usage-compare__side {
  padding: 20px 20px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-2);
}

.page-disclaimer .usage-compare__side--ok {
  border-left: 3px solid var(--cyan);
}

.page-disclaimer .usage-compare__side--no {
  border-left: 3px solid var(--red);
}

.page-disclaimer .usage-compare__head {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 14px !important;
  font-size: 14.5px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--paper);
  max-width: none !important;
}

.page-disclaimer .usage-compare__dot {
  width: 8px;
  height: 8px;
  flex: none;
  border-radius: 50%;
}

.page-disclaimer .usage-compare__side--ok .usage-compare__dot {
  background: var(--cyan);
  box-shadow: 0 0 10px rgba(47, 230, 200, .6);
}

.page-disclaimer .usage-compare__side--no .usage-compare__dot {
  background: var(--red);
  box-shadow: 0 0 10px rgba(255, 90, 110, .55);
}

.page-disclaimer .usage-compare__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-disclaimer .usage-compare__list li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 11px;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--muted);
}

.page-disclaimer .usage-compare__list li:last-child {
  margin-bottom: 0;
}

.page-disclaimer .usage-compare__list li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: .72em;
  width: 6px;
  height: 1px;
}

.page-disclaimer .usage-compare__side--ok .usage-compare__list li::before {
  background: var(--cyan);
}

.page-disclaimer .usage-compare__side--no .usage-compare__list li::before {
  background: var(--red);
}

/* ---------- 变更记录列表 ---------- */
.page-disclaimer .usage-changelog {
  margin: 22px 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-disclaimer .usage-changelog li {
  display: grid;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.page-disclaimer .usage-changelog__k {
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--purple);
}

.page-disclaimer .usage-changelog__v {
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
  max-width: 62ch;
}

/* ---------- 联系信息 ---------- */
.page-disclaimer .usage-contact {
  margin: 22px 0 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-2);
  overflow: hidden;
}

.page-disclaimer .usage-contact__row {
  display: grid;
  gap: 4px;
  padding: 15px 18px;
  border-bottom: 1px solid var(--line);
}

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

.page-disclaimer .usage-contact__label {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--muted);
}

.page-disclaimer .usage-contact__value {
  font-size: 15.5px;
  line-height: 1.6;
  color: var(--paper);
  text-decoration: none;
  word-break: break-word;
}

.page-disclaimer a.usage-contact__value {
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

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

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

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-disclaimer .usage-jump__list {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-disclaimer .usage-jump__list li {
    border-top: 1px solid var(--line);
  }

  .page-disclaimer .usage-jump__list li:nth-child(-n+2) {
    border-top: 0;
  }

  .page-disclaimer .usage-jump__list a {
    padding: 16px 18px;
    border-right: 1px solid var(--line);
  }

  .page-disclaimer .usage-jump__list li:nth-child(2n) a {
    border-right: 0;
  }

  .page-disclaimer .usage-scenes {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-disclaimer .usage-contact__row {
    grid-template-columns: 150px 1fr;
    align-items: baseline;
    gap: 16px;
  }
}

@media (min-width: 900px) {
  .page-disclaimer .usage-hero__grid {
    grid-template-columns: 7fr 5fr;
    align-items: center;
  }

  .page-disclaimer .usage-clause {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 44px;
  }

  .page-disclaimer .usage-clause__num {
    padding-top: 2px;
  }

  .page-disclaimer .usage-compare {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1px;
    background: var(--line);
    border: 1px solid var(--line);
  }

  .page-disclaimer .usage-compare__side {
    border: 0;
    border-radius: 0;
    padding: 24px 24px 26px;
  }

  .page-disclaimer .usage-compare__side--ok {
    border-left: 3px solid var(--cyan);
  }

  .page-disclaimer .usage-compare__side--no {
    border-left: 3px solid var(--red);
  }
}

@media (min-width: 1080px) {
  .page-disclaimer .usage-jump__list {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-disclaimer .usage-jump__list li:nth-child(3n) a {
    border-right: 0;
  }

  .page-disclaimer .usage-jump__list li:nth-child(-n+3) {
    border-top: 0;
  }

  .page-disclaimer .usage-clause {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: 56px;
  }

  .page-disclaimer .usage-changelog li {
    grid-template-columns: 130px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-disclaimer .usage-clause__num,
  .page-disclaimer .usage-jump__list a,
  .page-disclaimer .usage-clause__main p a,
  .page-disclaimer a.usage-contact__value {
    transition: none;
  }
}