.page-platform {
  --platform-card-bg: var(--color-surface-alt);
  --platform-focus-bg: var(--color-primary);
  --platform-marker: var(--color-accent);
  --platform-hairline: var(--color-line);
}

/* ---------- 首屏 ---------- */

.page-platform .platform-hero {
  position: relative;
}

.page-platform .platform-hero__title {
  margin: var(--space-2) 0 var(--space-3);
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: 1.04;
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  max-width: 13ch;
  transform: skewX(-2deg);
}

.page-platform .platform-hero__lead {
  max-width: 60ch;
  margin: 0;
  font-size: var(--text-lg);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-platform .platform-hero__media {
  margin-top: var(--space-4);
  aspect-ratio: 2 / 1;
}

.page-platform .media {
  display: block;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-surface-deep);
  box-shadow: var(--shadow-1);
}

.page-platform .media img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

/* ---------- 首屏 Bento 拼板 ---------- */

.page-platform .platform-board {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
  margin-top: var(--space-6);
}

.page-platform .platform-board__focus {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  background: var(--platform-focus-bg);
  color: var(--color-primary-ink);
  animation: platform-breathe 1.6s ease-in-out infinite;
}

.page-platform .platform-board__cell {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-3);
  border-radius: var(--radius-lg);
  background: var(--platform-card-bg);
  box-shadow: var(--shadow-1);
  border-top: var(--border-thin) solid var(--platform-hairline);
}

.page-platform .platform-board__cell--tint {
  background: var(--color-primary-soft);
  border-top-color: var(--color-highlight);
}

.page-platform .platform-board__focus .bento__label {
  color: var(--color-primary-ink);
  opacity: 0.8;
}

.page-platform .platform-focus__title {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-primary-ink);
}

.page-platform .platform-focus__text {
  margin: 0;
  max-width: 44ch;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-primary-ink);
  opacity: 0.9;
}

.page-platform .platform-focus__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-2);
}

.page-platform .platform-focus__list li {
  position: relative;
  padding-left: var(--space-3);
  font-size: var(--text-sm);
  line-height: 1.65;
  color: var(--color-primary-ink);
}

.page-platform .platform-focus__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 7px;
  height: 7px;
  border-radius: var(--radius-pill);
  background: var(--color-contrast-accent);
}

.page-platform .platform-focus__foot {
  margin-top: auto;
  padding-top: var(--space-3);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  border-top: var(--border-thin) solid var(--color-primary-ink);
}

.page-platform .platform-focus__foot .badge {
  background: var(--color-primary-ink);
  color: var(--color-primary);
}

.page-platform .platform-stat {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 6px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-base);
  color: var(--color-ink-soft);
}

.page-platform .platform-stat__num {
  font-size: var(--text-3xl);
  font-weight: var(--weight-heading);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--color-accent);
}

.page-platform .platform-stat__note {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.55;
  color: var(--color-ink-soft);
}

@keyframes platform-breathe {
  0%,
  100% {
    box-shadow: 0 0 0 0 var(--color-focus), var(--shadow-2);
  }
  50% {
    box-shadow: 0 0 0 9px transparent, var(--shadow-2);
  }
}

@media (min-width: 720px) {
  .page-platform .platform-board {
    grid-template-columns: repeat(12, 1fr);
    gap: var(--space-4);
  }

  .page-platform .platform-board__focus {
    grid-column: span 12;
    padding: var(--space-6);
  }

  .page-platform .platform-board__cell {
    grid-column: span 6;
  }
}

@media (min-width: 1024px) {
  .page-platform .platform-board__focus {
    grid-column: span 6;
    grid-row: span 2;
  }

  .page-platform .platform-board__cell {
    grid-column: span 3;
  }
}

/* ---------- 章节标题 ---------- */

.page-platform .platform-h2 {
  margin: var(--space-2) 0 var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  max-width: 24ch;
}

.page-platform .platform-lead {
  margin: 0 0 var(--space-4);
  max-width: 64ch;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

/* ---------- 四档详说 ---------- */

.page-platform .chip-bar {
  margin-bottom: var(--space-4);
}

.page-platform .platform-passes {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
  align-items: start;
}

.page-platform .pass {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  background: var(--platform-card-bg);
  box-shadow: var(--shadow-1);
}

.page-platform .pass:nth-child(3) {
  background: var(--color-primary-soft);
}

.page-platform .pass:nth-child(4) {
  background: var(--color-surface-deep);
}

.page-platform .pass__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
}

.page-platform .pass__tag {
  display: inline-flex;
  align-items: center;
  padding: calc(var(--space-1) * 0.5) var(--space-1);
  border-radius: var(--radius-sm);
  background: var(--color-highlight);
  color: var(--color-accent);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  line-height: 1.3;
  white-space: nowrap;
}

.page-platform .pass__for {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.65;
  color: var(--color-ink-soft);
}

.page-platform .pass__media {
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-md);
}

.page-platform .pass__specs {
  margin: 0;
  border-top: var(--border-thin) solid var(--platform-hairline);
}

.page-platform .pass__spec {
  display: grid;
  grid-template-columns: 4.5em 1fr;
  gap: var(--space-2);
  padding: var(--space-2) 0;
  border-bottom: var(--border-thin) solid var(--platform-hairline);
}

.page-platform .pass__spec:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-platform .pass__term {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.65;
  color: var(--color-ink-muted);
}

.page-platform .pass__desc {
  margin: 0;
  font-size: var(--text-base);
  line-height: 1.65;
  color: var(--color-ink);
}

.page-platform .pass__desc a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

@media (min-width: 860px) {
  .page-platform .platform-passes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-4);
  }
}

/* ---------- 差异速查表 ---------- */

.page-platform .platform-table-wrap {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  background: var(--platform-card-bg);
  box-shadow: var(--shadow-1);
  -webkit-overflow-scrolling: touch;
}

.page-platform .platform-table {
  width: 100%;
  min-width: 820px;
  border-collapse: separate;
  border-spacing: 0;
  font-size: var(--text-base);
}

.page-platform .platform-table caption {
  caption-side: top;
  text-align: left;
  padding: var(--space-3) var(--space-4) 0;
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

.page-platform .platform-table th,
.page-platform .platform-table td {
  padding: var(--space-3);
  text-align: left;
  vertical-align: top;
  line-height: 1.6;
  border-bottom: var(--border-thin) solid var(--platform-hairline);
}

.page-platform .platform-table thead th {
  position: sticky;
  top: 0;
  z-index: 3;
  background: var(--color-surface-deep);
  color: var(--color-ink);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  white-space: nowrap;
}

.page-platform .platform-table thead th:first-child {
  left: 0;
  z-index: 4;
}

.page-platform .platform-table tbody th {
  position: sticky;
  left: 0;
  z-index: 2;
  min-width: 108px;
  background: var(--color-surface-deep);
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  white-space: nowrap;
}

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

.page-platform .platform-val {
  display: block;
  color: var(--color-ink);
}

.page-platform .platform-val--muted {
  color: var(--color-ink-muted);
}

.page-platform .platform-val--mark {
  display: inline-block;
  padding: calc(var(--space-1) * 0.5) var(--space-1);
  border-radius: var(--radius-sm);
  background: var(--color-highlight);
  color: var(--color-accent);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  line-height: 1.4;
}

/* ---------- 开通步骤 ---------- */

.page-platform .platform-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

.page-platform .platform-note {
  margin-top: var(--space-4);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  background: var(--color-primary-soft);
  border-left: var(--border-thin) solid var(--color-accent);
}

.page-platform .platform-note__title {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-platform .platform-note__list {
  margin: 0;
  padding-left: 1.2em;
  display: grid;
  gap: var(--space-1);
  font-size: var(--text-base);
  line-height: 1.65;
  color: var(--color-ink);
}

.page-platform .steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-4);
  counter-reset: platform-step;
}

.page-platform .steps__item {
  position: relative;
  padding-left: var(--space-6);
}

.page-platform .steps__item::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: var(--radius-pill);
  background: var(--platform-marker);
  box-shadow: 0 0 0 3px var(--color-highlight);
}

.page-platform .steps__item:not(:last-child)::after {
  content: "";
  position: absolute;
  left: 9px;
  top: 24px;
  bottom: calc(-1 * var(--space-4) + 4px);
  width: var(--border-thin);
  background: var(--platform-hairline);
}

.page-platform .steps__title {
  margin: 0 0 var(--space-1);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-platform .steps__text {
  margin: 0;
  max-width: 62ch;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

@media (min-width: 1000px) {
  .page-platform .platform-split {
    grid-template-columns: minmax(0, 26em) minmax(0, 1fr);
    gap: var(--space-8);
    align-items: start;
  }
}

/* ---------- 选择建议 ---------- */

.page-platform .advice {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
}

.page-platform .advice__card {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  background: var(--platform-card-bg);
  border-left: var(--border-thin) solid var(--platform-hairline);
  transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
}

.page-platform .advice__card:hover,
.page-platform .advice__card:focus-within {
  transform: translateY(-2px);
  box-shadow: var(--shadow-2);
  background: var(--color-primary-soft);
}

.page-platform .advice__index {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  color: var(--color-accent);
}

.page-platform .advice__title {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-platform .advice__text {
  margin: 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-platform .advice__pick {
  margin: auto 0 0;
  padding-top: var(--space-2);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  color: var(--color-accent);
  border-top: var(--border-thin) solid var(--platform-hairline);
}

@media (min-width: 860px) {
  .page-platform .advice {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--space-4);
  }
}

/* ---------- 收束区 ---------- */

.page-platform .platform-closing__box {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  box-shadow: var(--shadow-2);
}

.page-platform .platform-closing__label {
  margin: 0 0 var(--space-1);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  color: var(--color-contrast-accent);
}

.page-platform .platform-closing__title {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-contrast-ink);
}

.page-platform .platform-closing__note {
  margin: 0;
  max-width: 46ch;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-contrast-ink);
  opacity: 0.88;
}

.page-platform .next-steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2);
}

.page-platform .next-link {
  display: block;
  padding: var(--space-3);
  border-radius: var(--radius-md);
  background: var(--color-contrast-surface);
  border: var(--border-thin) solid var(--color-contrast-line);
  text-decoration: none;
  color: inherit;
  transition: transform 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.page-platform .next-link:hover,
.page-platform .next-link:focus-visible {
  transform: translateY(-2px);
  border-color: var(--color-contrast-accent);
}

.page-platform .next-link__title {
  display: block;
  margin-bottom: var(--space-1);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-contrast-accent);
}

.page-platform .next-link__desc {
  display: block;
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--color-contrast-ink);
  opacity: 0.85;
}

@media (min-width: 720px) {
  .page-platform .next-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-3);
  }
}

@media (min-width: 1000px) {
  .page-platform .platform-closing__box {
    grid-template-columns: minmax(0, 22em) minmax(0, 1fr);
    gap: var(--space-6);
    padding: var(--space-6);
    align-items: start;
  }
}

/* ---------- 焦点与无障碍 ---------- */

.page-platform a:focus-visible,
.page-platform button:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  .page-platform .platform-board__focus {
    animation: none;
    box-shadow: var(--shadow-2);
  }

  .page-platform .advice__card,
  .page-platform .next-link {
    transition: none;
  }

  .page-platform .advice__card:hover,
  .page-platform .advice__card:focus-within,
  .page-platform .next-link:hover,
  .page-platform .next-link:focus-visible {
    transform: none;
  }
}