/* ===== 客户端说明页 · page-app-download ===== */

.page-app-download {
  background: var(--color-surface);
  color: var(--color-ink);
}

/* ---------- 面包屑 ---------- */
.page-app-download .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  margin: 0 0 var(--space-6);
  padding: 0;
  list-style: none;
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}
.page-app-download .breadcrumb li + li::before {
  content: "/";
  margin-right: var(--space-1);
  color: var(--color-line);
}
.page-app-download .breadcrumb a {
  color: var(--color-ink-soft);
  text-decoration: none;
  border-bottom: var(--border-thin) solid var(--color-line);
}
.page-app-download .breadcrumb a:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

/* ---------- 首屏分屏 ---------- */
.page-app-download .hero {
  display: grid;
  grid-template-columns: 1fr;
  border-bottom: var(--border-thick) solid var(--color-ink);
}

.page-app-download .hero-narrow {
  background: var(--color-surface);
  padding: var(--space-6) var(--space-4) var(--space-8);
}

.page-app-download .eyebrow {
  display: inline-block;
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  font-weight: var(--weight-heading);
  letter-spacing: 0.16em;
  color: var(--color-primary);
}

.page-app-download .hero-narrow h1 {
  margin: 0 0 var(--space-3);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-display);
  line-height: 0.94;
  letter-spacing: -0.035em;
  color: var(--color-ink);
}

.page-app-download .hero-sub {
  display: inline-block;
  margin: 0 0 var(--space-4);
  padding-bottom: var(--space-1);
  border-bottom: var(--border-thick) solid var(--color-primary);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: 0.02em;
  color: var(--color-ink);
}

.page-app-download .hero-lead {
  margin: 0;
  max-width: 40ch;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-app-download .hero-index {
  margin: var(--space-6) 0 0;
  padding: 0;
  list-style: none;
  border-top: var(--border-thick) solid var(--color-ink);
}
.page-app-download .hero-index li {
  border-bottom: var(--border-thin) solid var(--color-line);
}
.page-app-download .hero-index a {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-1);
  font-size: var(--text-sm);
  color: var(--color-ink);
  text-decoration: none;
  transition: background-color 160ms ease, color 160ms ease;
}
.page-app-download .hero-index a:hover,
.page-app-download .hero-index a:focus-visible {
  background: var(--color-primary-soft);
  color: var(--color-primary);
}
.page-app-download .hero-index .idx {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-primary);
}

/* 深色侧 */
.page-app-download .hero-wide {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  padding: var(--space-6) var(--space-4) var(--space-8);
  border-top: var(--border-thick) solid var(--color-contrast-line);
}
.page-app-download .eyebrow-dark {
  color: var(--color-contrast-accent);
}
.page-app-download .hero-wide-note {
  margin: 0;
  max-width: 52ch;
  font-size: var(--text-sm);
  line-height: 1.68;
  color: var(--color-contrast-ink);
  opacity: 0.78;
}

.page-app-download .version-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: var(--space-4) 0 var(--space-6);
  padding: 0;
  list-style: none;
  border-top: var(--border-thick) solid var(--color-contrast-line);
}
.page-app-download .version-col {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-3) var(--space-3) var(--space-4);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
  border-right: var(--border-thin) solid var(--color-contrast-line);
  transition: opacity 160ms ease, background-color 160ms ease;
}
.page-app-download .version-idx {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-contrast-ink);
  opacity: 0.55;
}
.page-app-download .version-figure {
  font-family: var(--font-mono);
  font-size: var(--text-3xl);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--color-contrast-accent);
}
.page-app-download .version-metric {
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-contrast-ink);
  opacity: 0.8;
}
.page-app-download .version-name {
  margin-top: var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: -0.01em;
  color: var(--color-contrast-ink);
}
.page-app-download .version-desc {
  font-size: var(--text-sm);
  line-height: 1.66;
  color: var(--color-contrast-ink);
  opacity: 0.74;
}

.page-app-download .hero-media {
  margin: var(--space-4) 0 0;
}
.page-app-download .hero-wide .media-caption {
  color: var(--color-contrast-ink);
  opacity: 0.68;
}

/* ---------- 通用分节 ---------- */
.page-app-download .section {
  padding: var(--section-y) 0;
}
.page-app-download .section-lg {
  padding: var(--section-y-lg) 0;
}
.page-app-download .band {
  background: var(--color-surface-alt);
  border-top: var(--border-thick) solid var(--color-ink);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-app-download .section-head {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}
.page-app-download .chapter-num {
  font-family: var(--font-mono);
  font-size: var(--text-4xl);
  line-height: 0.9;
  letter-spacing: -0.04em;
  color: var(--color-primary);
}
.page-app-download .section-head-body h2 {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-3xl);
  line-height: var(--leading-heading);
  letter-spacing: -0.02em;
  color: var(--color-ink);
}
.page-app-download .section-lead {
  margin: 0;
  max-width: 62ch;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}
.page-app-download .rule-double {
  margin: 0 0 var(--space-6);
}

/* ---------- 读法说明 ---------- */
.page-app-download .guide-grid {
  display: grid;
  gap: var(--space-6);
  margin-bottom: var(--space-6);
}
.page-app-download .guide-text {
  padding: var(--space-4);
  background: var(--color-surface-alt);
  border-left: var(--border-thick) solid var(--color-primary);
}
.page-app-download .guide-text p {
  margin: 0 0 var(--space-3);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}
.page-app-download .guide-text p:last-child {
  margin-bottom: 0;
}
.page-app-download .guide-legend {
  margin: 0 0 var(--space-3);
  padding: 0;
  list-style: none;
}
.page-app-download .guide-legend li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-2);
  padding: var(--space-2) 0;
  border-bottom: var(--border-thin) solid var(--color-line);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}
.page-app-download .guide-grid .media-frame {
  margin: 0;
}

/* 支持程度标签 */
.page-app-download .cell-full,
.page-app-download .cell-part,
.page-app-download .cell-none {
  display: inline-block;
  padding: 2px var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  white-space: nowrap;
}
.page-app-download .cell-full {
  background: var(--color-primary);
  color: var(--color-primary-ink);
}
.page-app-download .cell-part {
  background: var(--color-primary-soft);
  color: var(--color-ink);
  border: var(--border-thin) solid var(--color-primary);
}
.page-app-download .cell-none {
  background: var(--color-surface-deep);
  color: var(--color-ink-muted);
  border: var(--border-thin) solid var(--color-line);
}

/* ---------- 对照表：移动端为堆叠卡片 ---------- */
.page-app-download .matrix-scroll {
  border-top: var(--border-thick) solid var(--color-primary);
}
.page-app-download .matrix-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}
.page-app-download .matrix-table thead {
  display: none;
}
.page-app-download .matrix-table tbody,
.page-app-download .matrix-table tr,
.page-app-download .matrix-table th,
.page-app-download .matrix-table td {
  display: block;
  width: auto;
  text-align: left;
}
.page-app-download .matrix-row {
  padding: var(--space-3);
  background: var(--color-surface);
  border-bottom: var(--border-thick) solid var(--color-ink);
}
.page-app-download .matrix-row.alt {
  background: var(--color-surface-alt);
}
.page-app-download .matrix-row th {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-2);
  padding: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  color: var(--color-ink);
}
.page-app-download .matrix-row td {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--space-3);
  padding: var(--space-2) 0;
  border-top: var(--border-thin) solid var(--color-line);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}
.page-app-download .matrix-row td::before {
  content: attr(data-label);
  flex: 0 0 auto;
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}
.page-app-download .matrix-note td {
  padding: var(--space-3);
  background: var(--color-surface-deep);
  border-bottom: var(--border-thin) solid var(--color-line);
  font-size: var(--text-xs);
  line-height: 1.7;
  color: var(--color-ink-soft);
}
.page-app-download .row-ref {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
  white-space: nowrap;
}
.page-app-download .row-ref:hover {
  color: var(--color-accent);
}
.page-app-download .row-ref:focus-visible {
  outline: var(--border-thick) solid var(--color-focus);
  outline-offset: 2px;
}

/* ---------- 三层能力密度 ---------- */
.page-app-download .layers-grid {
  display: grid;
  gap: var(--space-6);
}
.page-app-download .layer-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: var(--border-thick) solid var(--color-ink);
}
.page-app-download .layer {
  padding: var(--space-4) 0;
  border-bottom: var(--border-thin) solid var(--color-line);
}
.page-app-download .layer-idx {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-accent);
}
.page-app-download .layer h3 {
  margin: var(--space-1) 0 var(--space-2);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-xl);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}
.page-app-download .layer p {
  margin: 0 0 var(--space-2);
  max-width: 62ch;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}
.page-app-download .layer-fit {
  margin: 0;
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  border-left: var(--border-thick) solid var(--color-primary);
  padding-left: var(--space-2);
}
.page-app-download .layers-grid .media-frame {
  margin: 0;
}

/* ---------- 准备清单 ---------- */
.page-app-download .prep-grid {
  display: grid;
  gap: var(--space-6);
}
.page-app-download .prep-grid .media-frame {
  margin: 0;
}
.page-app-download .prep-list {
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-app-download .prep-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-3);
  padding: var(--space-3) 0;
  border-bottom: var(--border-thin) solid var(--color-line);
}
.page-app-download .prep-item:first-child {
  border-top: var(--border-thick) solid var(--color-ink);
}
.page-app-download .prep-num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  background: var(--color-primary-soft);
  border: var(--border-thin) solid var(--color-primary);
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-primary);
}
.page-app-download .prep-body h3 {
  margin: 0 0 var(--space-1);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  color: var(--color-ink);
}
.page-app-download .prep-body p {
  margin: 0;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-app-download .first-steps {
  margin-top: var(--space-8);
  padding-top: var(--space-3);
  border-top: var(--border-thick) solid var(--color-ink);
}
.page-app-download .first-steps-title {
  margin: 0 0 var(--space-3);
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  font-weight: var(--weight-heading);
  letter-spacing: 0.16em;
  color: var(--color-accent);
}
.page-app-download .steps {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-app-download .steps li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-1) var(--space-3);
  align-items: baseline;
  padding: var(--space-3) var(--space-2);
  border-bottom: var(--border-thin) solid var(--color-line);
  transition: background-color 160ms ease;
}
.page-app-download .steps li:hover,
.page-app-download .steps li:focus-within {
  background: var(--color-primary-soft);
}
.page-app-download .step-num {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  font-weight: 700;
  line-height: 1;
  color: var(--color-primary);
}
.page-app-download .step-name {
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  color: var(--color-ink);
}
.page-app-download .step-text {
  font-size: var(--text-sm);
  line-height: 1.66;
  color: var(--color-ink-soft);
}

/* ---------- 选择建议 ---------- */
.page-app-download .advice-grid {
  display: grid;
  gap: var(--space-4);
}
.page-app-download .advice-col {
  padding: var(--space-4);
  background: var(--color-surface-alt);
  border-top: var(--border-thick) solid var(--color-ink);
}
.page-app-download .advice-col.is-primary {
  background: var(--color-primary);
  border-top-color: var(--color-primary);
  color: var(--color-primary-ink);
}
.page-app-download .advice-tier {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-accent);
}
.page-app-download .advice-col.is-primary .advice-tier {
  color: var(--color-primary-ink);
  opacity: 0.86;
}
.page-app-download .advice-col h3 {
  margin: var(--space-2) 0 var(--space-2);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-xl);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}
.page-app-download .advice-col.is-primary h3 {
  color: var(--color-primary-ink);
}
.page-app-download .advice-col p {
  margin: 0;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}
.page-app-download .advice-col.is-primary p {
  color: var(--color-primary-ink);
  opacity: 0.92;
}
.page-app-download .advice-col a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.page-app-download .advice-col.is-primary a {
  color: var(--color-primary-ink);
  text-decoration: underline;
}
.page-app-download .advice-col a:focus-visible {
  outline: var(--border-thick) solid var(--color-focus);
  outline-offset: 2px;
}

.page-app-download .closing {
  margin-top: var(--space-8);
  padding-top: var(--space-3);
  border-top: var(--border-thick) solid var(--color-ink);
}
.page-app-download .closing p {
  margin: 0;
  max-width: 72ch;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}
.page-app-download .closing a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.page-app-download .closing a:hover {
  color: var(--color-accent);
}

/* ---------- 悬停层次变化 ---------- */
@media (hover: hover) {
  .page-app-download .version-grid:hover .version-col {
    opacity: 0.42;
  }
  .page-app-download .version-grid .version-col:hover {
    opacity: 1;
    background: color-mix(in srgb, var(--color-contrast-ink) 7%, transparent);
  }
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 760px) {
  .page-app-download .version-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-app-download .version-col:last-child {
    border-right: 0;
  }
  .page-app-download .section-head {
    grid-template-columns: auto 1fr;
    gap: var(--space-6);
    align-items: start;
  }
  .page-app-download .guide-grid {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }
  .page-app-download .prep-grid {
    grid-template-columns: 1fr 1.15fr;
    align-items: start;
  }
  .page-app-download .steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-app-download .steps li {
    border-right: var(--border-thin) solid var(--color-line);
    border-bottom: 0;
    grid-template-columns: auto 1fr;
  }
  .page-app-download .steps li:last-child {
    border-right: 0;
  }
  .page-app-download .advice-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 桌面端：真表格 + 固定表头/首列 ---------- */
@media (min-width: 900px) {
  .page-app-download .hero {
    grid-template-columns: 5fr 7fr;
  }
  .page-app-download .hero-narrow {
    padding: var(--space-8) var(--space-6) var(--space-8)
      max(calc((100vw - var(--container)) / 2), var(--space-4));
  }
  .page-app-download .hero-wide {
    padding: var(--space-8) max(calc((100vw - var(--container)) / 2), var(--space-4))
      var(--space-8) var(--space-6);
    border-top: 0;
    border-left: var(--border-thick) solid var(--color-contrast-line);
  }
  .page-app-download .layers-grid {
    grid-template-columns: 1.2fr 1fr;
    align-items: start;
    gap: var(--space-8);
  }

  .page-app-download .matrix-scroll {
    overflow-x: auto;
    max-width: 100%;
  }
  .page-app-download .matrix-table {
    min-width: 880px;
    table-layout: fixed;
  }
  .page-app-download .matrix-table thead {
    display: table-header-group;
  }
  .page-app-download .matrix-table tbody {
    display: table-row-group;
  }
  .page-app-download .matrix-table tr {
    display: table-row;
  }
  .page-app-download .matrix-table th,
  .page-app-download .matrix-table td {
    display: table-cell;
    padding: var(--space-2) var(--space-3);
    vertical-align: top;
    text-align: left;
    border-bottom: var(--border-thin) solid var(--color-line);
  }
  .page-app-download .matrix-table thead th {
    position: sticky;
    top: 0;
    z-index: 3;
    background: var(--color-surface-deep);
    border-bottom: var(--border-thick) solid var(--color-ink);
    font-family: var(--font-heading);
    font-size: var(--text-sm);
    font-weight: var(--weight-heading);
    letter-spacing: 0.02em;
    color: var(--color-ink);
    white-space: nowrap;
  }
  .page-app-download .matrix-table thead th:first-child,
  .page-app-download .matrix-table tbody th:first-child {
    position: sticky;
    left: 0;
    z-index: 2;
    width: 24%;
  }
  .page-app-download .matrix-table thead th:first-child {
    z-index: 4;
  }
  .page-app-download .matrix-row {
    padding: 0;
    border-bottom: 0;
  }
  .page-app-download .matrix-row th {
    display: table-cell;
    padding: var(--space-2) var(--space-3);
    font-family: var(--font-heading);
    font-size: var(--text-sm);
    font-weight: var(--weight-heading);
    color: var(--color-ink);
    background: var(--color-surface);
    transition: background-color 160ms ease;
  }
  .page-app-download .matrix-row.alt th {
    background: var(--color-surface-alt);
  }
  .page-app-download .matrix-row.alt {
    background: var(--color-surface-alt);
  }
  .page-app-download .matrix-row td {
    display: table-cell;
    padding: var(--space-2) var(--space-3);
    border-top: 0;
    font-size: var(--text-sm);
    color: var(--color-ink-soft);
  }
  .page-app-download .matrix-row td::before {
    content: none;
  }
  .page-app-download .matrix-row:hover,
  .page-app-download .matrix-row:hover th,
  .page-app-download .matrix-row:focus-within,
  .page-app-download .matrix-row:focus-within th {
    background: var(--color-primary-soft);
  }
  .page-app-download .matrix-note {
    display: none;
  }
  .page-app-download .matrix-row:hover + .matrix-note,
  .page-app-download .matrix-row:focus-within + .matrix-note {
    display: table-row;
  }
  .page-app-download .matrix-note td {
    display: table-cell;
    padding: var(--space-2) var(--space-3);
    background: var(--color-surface-deep);
  }
}

/* ---------- 宽屏 ---------- */
@media (min-width: 1200px) {
  .page-app-download .guide-grid {
    grid-template-columns: 0.95fr 1.05fr;
    gap: var(--space-8);
  }
}