/* ============================================================
   使用指引 /usage/
   页面作用域：.page-disclaimer
   ============================================================ */

.page-disclaimer {
  --ud-measure: 68ch;
  padding-block: 28px 88px;
  color: var(--ink-900);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.75;
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */

.page-disclaimer .usage-hero {
  position: relative;
  padding-block: 20px 36px;
  border-bottom: 1px solid var(--line-200);
}

.page-disclaimer .usage-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 104px;
  height: 3px;
  background: linear-gradient(90deg, var(--mint-500), var(--amber-400));
}

.page-disclaimer .usage-hero .tag {
  margin: 0;
}

.page-disclaimer .usage-hero h1 {
  margin: 16px 0 0;
  max-width: 22ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.95rem, 7vw, 3.35rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--ink-900);
}

.page-disclaimer .usage-lede {
  margin: 18px 0 0;
  max-width: 60ch;
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--ink-700);
}

/* ---------- 通用正文块 ---------- */

.page-disclaimer .usage-section {
  padding-block: 42px;
  border-bottom: 1px solid var(--line-200);
}

.page-disclaimer .usage-section:last-of-type {
  border-bottom: 0;
  padding-bottom: 12px;
}

.page-disclaimer .usage-section h2 {
  margin: 0 0 18px;
  font-family: var(--font-sans);
  font-size: clamp(1.28rem, 3.6vw, 1.72rem);
  font-weight: 700;
  line-height: 1.32;
  letter-spacing: -0.01em;
  color: var(--ink-900);
}

.page-disclaimer .usage-section h2::before {
  content: "";
  display: block;
  width: 28px;
  height: 4px;
  margin-bottom: 12px;
  border-radius: 2px;
  background: var(--mint-500);
}

.page-disclaimer .usage-section > p {
  margin: 0 0 14px;
  max-width: var(--ud-measure);
  color: var(--ink-900);
}

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

.page-disclaimer .usage-section h3 {
  margin: 34px 0 14px;
  padding-left: 12px;
  border-left: 3px solid var(--amber-400);
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--ink-900);
}

.page-disclaimer a {
  color: var(--mint-600);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color 180ms var(--ease);
}

.page-disclaimer a:hover,
.page-disclaimer a:focus-visible {
  color: var(--ink-900);
}

.page-disclaimer a:focus-visible {
  outline: 2px solid var(--mint-500);
  outline-offset: 2px;
  border-radius: 2px;
}

/* ---------- 步骤清单 ---------- */

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

.page-disclaimer .usage-step {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 10px;
  padding: 16px 0;
  border-top: 1px solid var(--line-200);
}

.page-disclaimer .usage-step:last-child {
  border-bottom: 1px solid var(--line-200);
}

.page-disclaimer .usage-step__num {
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
  color: var(--mint-600);
}

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

.page-disclaimer .usage-step__body p {
  margin: 0;
  max-width: var(--ud-measure);
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--slate-500);
}

.page-disclaimer .usage-step__body p.usage-step__act {
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink-900);
}

.page-disclaimer .usage-step__body p + p {
  margin-top: 6px;
}

/* ---------- 折角提示 ---------- */

.page-disclaimer .usage-note {
  position: relative;
  margin: 22px 0 0;
  padding: 16px 18px;
  max-width: var(--ud-measure);
  background: var(--mint-050);
  border: 1px solid rgba(47, 211, 164, 0.35);
  border-radius: var(--radius);
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--ink-700);
}

.page-disclaimer .usage-note::before {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  width: 16px;
  height: 16px;
  background: var(--mint-500);
  clip-path: polygon(0 0, 100% 0, 0 100%);
  border-top-left-radius: var(--radius);
}

/* ---------- 导出区布局 ---------- */

.page-disclaimer .usage-export {
  margin-top: 26px;
  display: grid;
  gap: 28px;
}

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

/* ---------- 字段说明表 ---------- */

.page-disclaimer .usage-table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--line-200);
  border-radius: var(--radius);
  background: var(--paper-100);
  box-shadow: var(--shadow-stack);
}

.page-disclaimer .usage-table {
  width: 100%;
  min-width: 480px;
  border-collapse: collapse;
  font-size: 0.9375rem;
}

.page-disclaimer .usage-table thead th {
  padding: 12px 16px;
  text-align: left;
  white-space: nowrap;
  background: var(--ink-700);
  color: var(--paper-000);
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.08em;
}

.page-disclaimer .usage-table tbody th,
.page-disclaimer .usage-table tbody td {
  padding: 12px 16px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line-200);
  line-height: 1.72;
}

.page-disclaimer .usage-table tbody tr:last-child th,
.page-disclaimer .usage-table tbody tr:last-child td {
  border-bottom: 0;
}

.page-disclaimer .usage-table tbody th {
  white-space: nowrap;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--ink-900);
}

.page-disclaimer .usage-table tbody td {
  color: var(--slate-500);
}

.page-disclaimer .usage-table th:first-child,
.page-disclaimer .usage-table td:first-child {
  position: sticky;
  left: 0;
  z-index: 2;
  background: var(--paper-100);
  box-shadow: 1px 0 0 var(--line-200);
}

.page-disclaimer .usage-table thead th:first-child {
  z-index: 3;
  background: var(--ink-700);
  box-shadow: 1px 0 0 rgba(251, 249, 244, 0.18);
}

/* ---------- 配图 ---------- */

.page-disclaimer .usage-figure {
  margin: 0;
  padding: 10px 10px 12px;
  background: var(--paper-100);
  border: 1px solid var(--line-200);
  border-radius: var(--radius);
  box-shadow: var(--shadow-stack);
}

.page-disclaimer .usage-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-sm);
  background: var(--night-800);
}

.page-disclaimer .usage-figure figcaption {
  margin-top: 10px;
  padding-inline: 2px;
  font-size: 0.8125rem;
  line-height: 1.65;
  color: var(--slate-500);
}

/* ---------- 响应式 ---------- */

@media (max-width: 1023px) {
  .page-disclaimer .usage-figure {
    max-width: 560px;
  }
}

@media (min-width: 768px) {
  .page-disclaimer {
    padding-block: 40px 108px;
  }

  .page-disclaimer .usage-hero {
    padding-block: 28px 48px;
  }

  .page-disclaimer .usage-section {
    padding-block: 56px;
  }

  .page-disclaimer .usage-step {
    grid-template-columns: 52px minmax(0, 1fr);
    gap: 16px;
    padding: 18px 0;
  }

  .page-disclaimer .usage-step__num {
    font-size: 0.875rem;
  }
}

@media (min-width: 1024px) {
  .page-disclaimer {
    padding-block: 48px 128px;
  }

  .page-disclaimer .usage-export {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
    gap: 44px;
    align-items: start;
  }

  .page-disclaimer .usage-section {
    padding-block: 64px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-disclaimer a {
    transition: none;
  }
}