/* ============================================================
   功能特性 /features/
   页面作用域：.page-features
   ============================================================ */

.page-features {
  display: block;
}

/* ---------- 首屏海报层 ---------- */

.page-features .pf-hero {
  position: relative;
  overflow: hidden;
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  padding-block: calc(var(--space-8) + var(--space-2)) var(--space-8);
}

.page-features .pf-crumb {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  margin: 0 0 var(--space-6);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-contrast-line);
}

.page-features .pf-crumb a {
  color: var(--color-contrast-accent);
  text-decoration: none;
}

.page-features .pf-crumb a:hover,
.page-features .pf-crumb a:focus-visible {
  text-decoration: underline;
}

.page-features .pf-hero__grid {
  display: grid;
  gap: var(--space-6);
  align-items: end;
}

.page-features .pf-hero__title {
  margin: 0 0 var(--space-3);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-display);
  line-height: 0.9;
  letter-spacing: var(--tracking-heading);
  color: var(--color-contrast-ink);
}

.page-features .pf-hero__lede {
  margin: 0;
  max-width: 56ch;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-contrast-ink);
  opacity: 0.82;
}

/* 模块索引带 */

.page-features .pf-index {
  padding-top: var(--space-2);
  border-top: var(--border-thick) solid var(--color-contrast-accent);
}

.page-features .pf-index__label {
  margin: 0 0 var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-contrast-line);
}

.page-features .pf-index__list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-1) var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-features .pf-index__item {
  display: flex;
  align-items: baseline;
  gap: var(--space-1);
  padding-bottom: 4px;
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}

.page-features .pf-index__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-contrast-accent);
}

.page-features .pf-index__name {
  font-size: var(--text-sm);
  color: var(--color-contrast-ink);
  opacity: 0.76;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* 三个关键数字 */

.page-features .pf-figures {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4) var(--space-6);
  margin-top: var(--space-6);
  padding-top: var(--space-4);
  border-top: var(--border-thin) solid var(--color-contrast-line);
}

.page-features .pf-figure {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.page-features .pf-figure__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: var(--text-2xl);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--color-contrast-accent);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.page-features .pf-figure__label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-contrast-line);
}

/* ---------- 通用媒体块 ---------- */

.page-features .pf-media {
  position: relative;
  margin: 0;
  overflow: hidden;
  background: var(--color-surface-deep);
  border-radius: var(--radius-sm);
}

.page-features .pf-media__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-features .pf-media__scrim {
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
  pointer-events: none;
}

.page-features .pf-media__body {
  position: absolute;
  inset-inline: 0;
  bottom: 0;
  padding: var(--space-4) var(--space-2);
}

.page-features .pf-media--wide {
  aspect-ratio: 4 / 3;
}

.page-features .pf-media--portrait {
  aspect-ratio: 4 / 5;
}

.page-features .pf-media--strip {
  aspect-ratio: 16 / 9;
}

/* ---------- 分组区块 ---------- */

.page-features .pf-group {
  position: relative;
  padding-block: var(--section-y);
}

.page-features .pf-group__title {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-xl);
  line-height: 1.14;
  letter-spacing: var(--tracking-heading);
  max-width: 26ch;
}

.page-features .pf-group__text {
  margin: 0 0 var(--space-3);
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-features .pf-group__facts {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-6);
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

.page-features .pf-num {
  margin-right: var(--space-1);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: var(--text-lg);
  color: var(--color-primary);
  font-variant-numeric: tabular-nums;
}

/* 第 01 组 —— 宽版图片压顶 */

.page-features .pf-group--wide {
  background: var(--color-surface);
  padding-block: 0 var(--section-y);
}

.page-features .pf-group--wide .pf-media--wide {
  margin-bottom: var(--space-6);
}

.page-features .pf-group--wide .pf-group__title {
  color: var(--color-contrast-ink);
  max-width: 24ch;
}

/* 第 02 组 —— 窄版左文右图 */

.page-features .pf-group--narrow {
  background: var(--color-surface-alt);
}

.page-features .pf-group__split {
  display: grid;
  gap: var(--space-4);
}

/* 第 03 组 —— 深色底叠加图片 */

.page-features .pf-group--deep {
  overflow: hidden;
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.page-features .pf-group__bg {
  position: absolute;
  inset: 0;
}

.page-features .pf-group__bg img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-features .pf-group--deep .pf-group__title {
  color: var(--color-contrast-ink);
  max-width: 22ch;
}

.page-features .pf-group--deep .pf-group__text {
  color: var(--color-contrast-ink);
  opacity: 0.82;
}

.page-features .pf-group--deep .pf-group__facts {
  color: var(--color-contrast-line);
}

.page-features .pf-group--deep .pf-num {
  color: var(--color-contrast-accent);
}

.page-features .pf-group--deep .container {
  position: relative;
  z-index: 1;
}

/* 第 04 组 —— 顶部窄横幅 */

.page-features .pf-group--banner {
  background: var(--color-surface);
}

.page-features .pf-group--banner .pf-media--strip {
  margin-bottom: var(--space-6);
}

.page-features .pf-group--banner .pf-group__title {
  color: var(--color-contrast-ink);
  max-width: 26ch;
}

/* ---------- 模块矩阵 ---------- */

.page-features .pf-matrix {
  padding-block: var(--section-y);
  background: var(--color-surface-alt);
}

.page-features .pf-matrix__title {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-xl);
  line-height: 1.14;
  letter-spacing: var(--tracking-heading);
  max-width: 24ch;
}

.page-features .pf-matrix__lede {
  margin: 0 0 var(--space-4);
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-features .pf-jump {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  margin-bottom: var(--space-6);
}

.page-features .pf-jump a {
  padding: var(--space-1) var(--space-2);
  border: var(--border-thin) solid var(--color-line);
  background: var(--color-surface);
  color: var(--color-ink-soft);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-decoration: none;
  border-radius: var(--radius-sm);
}

.page-features .pf-jump a:hover,
.page-features .pf-jump a:focus-visible {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-accent-ink);
}

.page-features .pf-cards {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--gutter);
}

.page-features .pf-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-3);
  background: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  border-top: var(--border-thick) solid var(--color-contrast-surface);
  border-radius: var(--radius-sm);
}

.page-features .pf-card__head {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.page-features .pf-card__num {
  display: inline-block;
  padding: 2px var(--space-1);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  border-radius: var(--radius-sm);
}

.page-features .pf-card__name {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-base);
  line-height: 1.3;
  letter-spacing: 0.01em;
  color: var(--color-ink);
}

.page-features .pf-card__scene {
  margin: 0;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-features .pf-card__more {
  border-top: var(--border-thin) solid var(--color-line);
  padding-top: var(--space-1);
}

.page-features .pf-card__more > summary {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding-block: var(--space-1);
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.page-features .pf-card__more > summary::-webkit-details-marker {
  display: none;
}

.page-features .pf-card__more > summary::before {
  content: "—";
  color: var(--color-primary);
}

.page-features .pf-card__more[open] > summary::before {
  content: "▾";
}

.page-features .pf-card__list {
  margin: 0;
  padding: 0 0 0 var(--space-2);
  list-style: none;
}

.page-features .pf-card__list li {
  position: relative;
  padding-left: var(--space-2);
  margin-bottom: var(--space-1);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-features .pf-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 10px;
  height: 2px;
  background: var(--color-primary);
}

.page-features .pf-card__foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1) var(--space-2);
  margin-top: auto;
  padding-top: var(--space-2);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-features .pf-card__state {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-ink-muted);
}

.page-features .pf-card__count {
  margin-left: auto;
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
  white-space: nowrap;
}

/* ---------- 暖色与冷色说明 ---------- */

.page-features .pf-legend {
  padding-block: var(--section-y);
  background: var(--color-surface);
}

.page-features .pf-legend__title {
  margin: 0 0 var(--space-6);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-xl);
  line-height: 1.14;
  letter-spacing: var(--tracking-heading);
  max-width: 22ch;
}

.page-features .pf-legend__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
}

.page-features .pf-legend__col {
  padding: var(--space-3);
  border-radius: var(--radius-sm);
}

.page-features .pf-legend__col--service {
  background: var(--color-primary-soft);
}

.page-features .pf-legend__col--rule {
  background: var(--color-highlight);
}

.page-features .pf-legend__col h3 {
  margin: var(--space-2) 0 var(--space-2);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-base);
  line-height: 1.35;
  color: var(--color-ink);
}

.page-features .pf-legend__col p {
  margin: 0;
  max-width: 52ch;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-features .pf-legend__note {
  margin: var(--space-6) 0 0;
  max-width: var(--measure);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-muted);
}

.page-features .pf-legend__note a {
  color: var(--color-ink);
  text-decoration: none;
  border-bottom: var(--border-thick) solid var(--color-primary);
}

.page-features .pf-legend__note a:hover,
.page-features .pf-legend__note a:focus-visible {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

/* ---------- 编号表格 ---------- */

.page-features .pf-map {
  padding-block: var(--section-y);
  background: var(--color-surface-deep);
}

.page-features .pf-map__title {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-xl);
  line-height: 1.14;
  letter-spacing: var(--tracking-heading);
  max-width: 24ch;
}

.page-features .pf-map__lede {
  margin: 0 0 var(--space-4);
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-features .pf-table__wrap {
  overflow-x: auto;
  background: var(--color-surface);
  border-radius: var(--radius-sm);
}

.page-features .pf-table {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

.page-features .pf-table__caption {
  padding: var(--space-2);
  text-align: left;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-features .pf-table thead th {
  padding: var(--space-2);
  background: var(--color-accent);
  color: var(--color-accent-ink);
  text-align: left;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 400;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  white-space: nowrap;
}

.page-features .pf-table tbody th,
.page-features .pf-table tbody td {
  padding: var(--space-2);
  border-bottom: var(--border-thin) solid var(--color-line);
  text-align: left;
  color: var(--color-ink-soft);
  vertical-align: top;
}

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

.page-features .pf-table tbody th {
  font-weight: 400;
}

.page-features .pf-table__num {
  font-family: var(--font-mono);
  letter-spacing: 0.1em;
  color: var(--color-accent);
}

.page-features .pf-table__mono {
  font-family: var(--font-mono);
  color: var(--color-primary);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

/* ---------- 收束 ---------- */

.page-features .pf-outro {
  padding-block: var(--section-y-lg);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.page-features .pf-outro__title {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-xl);
  line-height: 1.14;
  letter-spacing: var(--tracking-heading);
  color: var(--color-contrast-ink);
  max-width: 20ch;
}

.page-features .pf-outro__text {
  margin: 0 0 var(--space-4);
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-contrast-ink);
  opacity: 0.78;
}

.page-features .pf-outro__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.page-features .pf-link {
  display: inline-flex;
  align-items: baseline;
  gap: var(--space-1);
  color: var(--color-contrast-ink);
  font-size: var(--text-base);
  text-decoration: none;
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
  padding-bottom: 4px;
}

.page-features .pf-link::before {
  content: "→";
  font-family: var(--font-mono);
  color: var(--color-contrast-accent);
}

.page-features .pf-link:hover,
.page-features .pf-link:focus-visible {
  color: var(--color-contrast-accent);
  border-bottom-color: var(--color-contrast-accent);
}

/* ============================================================
   响应式
   ============================================================ */

@media (min-width: 640px) {
  .page-features .pf-figure__num {
    font-size: var(--text-3xl);
  }

  .page-features .pf-jump a {
    font-size: var(--text-sm);
  }
}

@media (min-width: 760px) {
  .page-features .pf-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-4) var(--space-6);
  }

  .page-features .pf-card:nth-child(even) {
    margin-top: var(--space-6);
  }

  .page-features .pf-legend__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--gutter);
  }

  .page-features .pf-outro__links {
    flex-direction: row;
    flex-wrap: wrap;
    gap: var(--space-3) var(--space-6);
  }
}

@media (min-width: 900px) {
  .page-features .pf-hero__grid {
    grid-template-columns: repeat(11, minmax(0, 1fr));
    gap: var(--gutter);
  }

  .page-features .pf-hero__main {
    grid-column: 1 / span 9;
  }

  .page-features .pf-index {
    grid-column: 10 / span 2;
  }

  .page-features .pf-index__list {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-features .pf-media--wide {
    aspect-ratio: 21 / 9;
  }

  .page-features .pf-media--strip {
    aspect-ratio: 3 / 1;
  }

  .page-features .pf-group__split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 320px);
    gap: var(--space-6);
    align-items: start;
  }

  .page-features .pf-group--narrow .pf-group__lead {
    padding-top: var(--space-2);
  }

  .page-features .pf-group__title {
    font-size: var(--text-2xl);
  }
}

@media (min-width: 1100px) {
  .page-features .pf-group--wide .pf-media__body {
    padding: var(--space-6) var(--space-4);
  }

  .page-features .pf-group--wide .pf-group__body {
    display: grid;
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: var(--space-6);
    align-items: start;
  }

  .page-features .pf-group--wide .pf-group__text {
    margin-bottom: 0;
  }

  .page-features .pf-group--banner .pf-group__body {
    display: grid;
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: var(--space-6);
    align-items: start;
  }

  .page-features .pf-group--banner .pf-group__text {
    margin-bottom: 0;
  }

  .page-features .pf-group--deep .container {
    display: grid;
    grid-template-columns: minmax(0, 8fr) minmax(0, 3fr);
    gap: var(--space-6);
    align-items: start;
  }

  .page-features .pf-group--deep .eyebrow,
  .page-features .pf-group--deep .pf-group__title,
  .page-features .pf-group--deep .pf-group__text {
    grid-column: 1;
  }

  .page-features .pf-group--deep .pf-group__facts {
    grid-column: 2;
    grid-row: 1 / span 3;
    flex-direction: column;
    gap: var(--space-3);
    justify-content: flex-end;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-features [data-reveal] {
    transform: none !important;
    transition: none !important;
  }
}