/*
 * 品蟹学院 V4：事实型编辑叙事。
 * 仅覆盖 .news-design-v4 主体，公共头尾与全站导航不在本文件职责内。
 */

.md-news_list.news-design-v4 {
  --news-v4-rail: 1240px;
  --news-v4-gutter: clamp(20px, 4vw, 56px);
  --news-v4-section-space: 60px;
  --news-v4-fast: 180ms;
  --news-v4-slow: 620ms;
  background: var(--news-page-bg);
}

.md-news_list.news-design-v4 .hero {
  display: block;
  min-height: 0;
  padding: 60px var(--news-v4-gutter);
  overflow: hidden;
  background: var(--news-hero-bg);
}

.md-news_list.news-design-v4 .hero-shell {
  display: grid;
  width: min(100%, var(--news-v4-rail));
  min-height: min(560px, calc(100svh - 280px));
  margin: 0 auto;
  grid-template-columns: minmax(300px, 0.82fr) minmax(0, 1.18fr);
  align-items: center;
  gap: clamp(40px, 6vw, 88px);
}

.md-news_list.news-design-v4 .hero-content {
  max-width: 560px;
  margin: 0;
  padding: 0;
  text-align: left;
}

.md-news_list.news-design-v4 .hero-badge {
  display: block;
  min-height: 0;
  margin: 0 0 22px;
  padding: 0;
  border: 0;
  border-radius: 0;
  color: var(--primary);
  background: transparent;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.5;
  opacity: 1;
  animation: newsV4Rise var(--news-v4-slow) cubic-bezier(0.22, 1, 0.36, 1) both;
}

.md-news_list.news-design-v4 .hero-title {
  display: block;
  margin: 0;
  color: var(--news-text-strong);
  font-size: 62px;
  font-weight: 800;
  line-height: 1.02;
  letter-spacing: 0;
  text-wrap: balance;
  opacity: 1;
  animation: newsV4Rise var(--news-v4-slow) cubic-bezier(0.22, 1, 0.36, 1) 80ms both;
}

.md-news_list.news-design-v4 .hero-title-dark,
.md-news_list.news-design-v4 .hero-title-accent {
  display: block;
  color: inherit;
}

.md-news_list.news-design-v4 .hero-title-accent {
  margin-top: 12px;
  color: var(--primary);
  font-size: 0.48em;
  font-weight: 700;
  line-height: 1.25;
}

.md-news_list.news-design-v4 .hero-subtitle {
  max-width: 34em;
  margin: 30px 0 0;
  color: var(--news-text-muted);
  font-size: 18px;
  font-weight: 400;
  line-height: 1.8;
  text-wrap: pretty;
  opacity: 1;
  animation: newsV4Rise var(--news-v4-slow) cubic-bezier(0.22, 1, 0.36, 1) 150ms both;
}

.md-news_list.news-design-v4 .hero-actions {
  display: flex;
  justify-content: flex-start;
  gap: 14px;
  margin-top: 38px;
  opacity: 1;
  animation: newsV4Rise var(--news-v4-slow) cubic-bezier(0.22, 1, 0.36, 1) 220ms both;
}

.md-news_list.news-design-v4 .btn-primary,
.md-news_list.news-design-v4 .btn-secondary {
  min-height: 52px;
  gap: 9px;
  padding: 13px 22px;
  border-radius: 6px;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.4;
  transition: color var(--news-v4-fast) ease, background-color var(--news-v4-fast) ease, border-color var(--news-v4-fast) ease, transform var(--news-v4-fast) ease;
}

.md-news_list.news-design-v4 .btn-primary:hover,
.md-news_list.news-design-v4 .btn-secondary:hover {
  transform: translateY(-2px);
}

.md-news_list.news-design-v4 .btn-primary:focus-visible,
.md-news_list.news-design-v4 .btn-secondary:focus-visible {
  outline: 3px solid var(--primary-bg);
  outline-offset: 3px;
}

.md-news_list.news-design-v4 .hero-action-icon {
  width: 18px;
  height: 18px;
  flex: 0 0 auto;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.md-news_list.news-design-v4 .hero-media {
  position: relative;
  margin: 0;
  animation: newsV4Reveal 900ms cubic-bezier(0.22, 1, 0.36, 1) 120ms both;
}

.md-news_list.news-design-v4 .hero-media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 11 / 9;
  border-radius: 8px;
  background: var(--news-surface-soft);
}

.md-news_list.news-design-v4 .hero-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 52% center;
}

.md-news_list.news-design-v4 .hero-media figcaption {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 18px;
  margin-top: 14px;
  color: var(--news-text-soft);
  font-size: 16px;
  line-height: 1.6;
}

.md-news_list.news-design-v4 .hero-media figcaption strong {
  color: var(--news-text-strong);
  font-size: 16px;
  font-weight: 700;
}

.md-news_list.news-design-v4 .stats-section {
  content-visibility: visible;
  contain-intrinsic-size: none;
  padding: 0 var(--news-v4-gutter);
  border-top: 1px solid var(--news-border);
  border-bottom: 1px solid var(--news-border);
  background: var(--news-section-bg);
}

.md-news_list.news-design-v4 .stats-grid {
  display: grid;
  width: min(100%, var(--news-v4-rail));
  margin: 0 auto;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
}

.md-news_list.news-design-v4 .stat-card {
  position: relative;
  display: grid;
  min-height: 132px;
  padding: 28px clamp(18px, 3vw, 38px);
  border: 0;
  border-radius: 0;
  background: transparent;
  text-align: center;
  align-content: center;
  transition: background-color var(--news-v4-fast) ease;
}

.md-news_list.news-design-v4 .stat-card + .stat-card {
  border-left: 1px solid var(--news-border);
}

.md-news_list.news-design-v4 .stat-card:hover {
  border-color: var(--news-border);
  background: var(--news-surface-soft);
  box-shadow: none;
  transform: none;
}

.md-news_list.news-design-v4 .stat-number {
  margin: 0;
  color: var(--primary);
  font-size: 32px;
  font-weight: 800;
  line-height: 1.1;
}

.md-news_list.news-design-v4 .stat-label {
  margin-top: 9px;
  color: var(--news-text-muted);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
}

.md-news_list.news-design-v4 .category-section {
  content-visibility: visible;
  contain-intrinsic-size: none;
  padding: var(--news-v4-section-space) var(--news-v4-gutter) 0;
  background: var(--news-section-bg);
}

.md-news_list.news-design-v4 .section-inner {
  width: min(100%, var(--news-v4-rail));
  max-width: none;
}

.md-news_list.news-design-v4 .category-section .section-header {
  display: block;
  width: 100%;
  margin: 0 0 44px;
}

.md-news_list.news-design-v4 .category-section .section-copy {
  display: grid;
  max-width: none;
  padding-bottom: 32px;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 0.62fr);
  align-items: end;
  gap: 40px;
  border-bottom: 1px solid var(--news-border);
  text-align: left;
}

.md-news_list.news-design-v4 .section-heading-group {
  min-width: 0;
}

.md-news_list.news-design-v4 .category-section .section-eyebrow {
  display: block;
  min-height: 0;
  margin: 0 0 12px;
  padding: 0;
  border: 0;
  border-radius: 0;
  color: var(--primary);
  background: transparent;
  box-shadow: none;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: none;
}

.md-news_list.news-design-v4 .category-section .section-eyebrow::before {
  display: none;
}

.md-news_list.news-design-v4 .category-section .section-title {
  max-width: 760px;
  color: var(--news-text-strong);
  font-size: 42px;
  font-weight: 800;
  line-height: 1.12;
}

.md-news_list.news-design-v4 .category-section .section-title .thin {
  color: inherit;
  font-weight: inherit;
}

.md-news_list.news-design-v4 .category-section .section-desc {
  max-width: 34em;
  margin: 0;
  padding: 0;
  color: var(--news-text-muted);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.75;
}

.md-news_list.news-design-v4 .category-section .section-desc::before {
  display: none;
}

.md-news_list.news-design-v4 .category-section .section-tools {
  display: grid;
  width: 100%;
  max-width: none;
  margin: 0;
  padding: 18px 0 0;
  grid-template-columns: minmax(260px, 0.72fr) minmax(340px, 1fr);
  align-items: center;
  gap: 20px;
  border: 0;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
  justify-self: stretch;
}

.md-news_list.news-design-v4 .search-bar input {
  min-height: 50px;
  padding-top: 12px;
  padding-bottom: 12px;
  border-color: var(--news-border);
  border-radius: 6px;
  background: var(--news-surface);
  font-size: 14px;
}

.md-news_list.news-design-v4 .search-submit {
  right: 5px;
  width: 40px;
  height: 40px;
  border-radius: 5px;
}

.md-news_list.news-design-v4 .search-submit:focus-visible {
  outline: 3px solid var(--primary-bg);
  outline-offset: 2px;
}

.md-news_list.news-design-v4 .search-suggestions {
  max-width: none;
  border-radius: 6px;
}

.md-news_list.news-design-v4 .search-suggestion {
  border-radius: 4px;
}

.md-news_list.news-design-v4 .category-tabs {
  justify-content: flex-start;
  gap: 4px;
  padding: 4px;
  border-radius: 6px;
  box-shadow: none;
}

.md-news_list.news-design-v4 .category-tab {
  min-height: 42px;
  padding: 9px 18px;
  border-radius: 4px;
  font-size: 14px;
}

.md-news_list.news-design-v4 .category-tab:focus-visible {
  outline: 3px solid var(--primary-bg);
  outline-offset: 2px;
}

.md-news_list.news-design-v4 .news-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 clamp(32px, 5vw, 72px);
}

/* 所有文章使用同一密度，避免首篇独占一屏并打断列表扫描节奏。 */

.md-news_list.news-design-v4 .news-card {
  min-width: 0;
  overflow: visible;
  border: 0;
  border-bottom: 1px solid var(--news-border);
  border-radius: 0;
  background: transparent;
  cursor: pointer;
  transition: border-color var(--news-v4-fast) ease;
}

.md-news_list.news-design-v4 .news-card:hover {
  border-color: var(--news-card-hover-border);
  box-shadow: none;
  transform: none;
}

.md-news_list.news-design-v4 .news-card-link {
  display: grid;
  min-height: 212px;
  padding: 28px 0;
  grid-template-columns: minmax(150px, 0.78fr) minmax(0, 1.22fr);
  align-items: center;
  gap: clamp(20px, 2vw, 30px);
}

.md-news_list.news-design-v4 .news-card-image {
  aspect-ratio: 4 / 3;
  border-radius: 6px;
}

.md-news_list.news-design-v4 .news-card-image-overlay {
  display: none;
}

.md-news_list.news-design-v4 .news-card-category {
  top: 10px;
  left: 10px;
  padding: 5px 9px;
  border-radius: 4px;
  color: var(--news-on-accent);
  background: color-mix(in srgb, var(--primary) 92%, transparent);
  font-size: 12px;
  font-weight: 700;
}

.md-news_list.news-design-v4 .news-card-body {
  min-width: 0;
  padding: 0;
}

.md-news_list.news-design-v4 .news-card-meta {
  margin-bottom: 12px;
}

.md-news_list.news-design-v4 .news-card-date {
  color: var(--news-text-soft);
  font-size: 13px;
  font-weight: 600;
}

.md-news_list.news-design-v4 .news-card-read {
  color: var(--primary);
  font-size: 13px;
  font-weight: 700;
}

.md-news_list.news-design-v4 .news-card-read svg {
  width: 16px;
  height: 16px;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.md-news_list.news-design-v4 .news-card-title {
  display: -webkit-box;
  margin: 0;
  overflow: hidden;
  color: var(--news-text-strong);
  font-size: 20px;
  font-weight: 750;
  line-height: 1.45;
  text-wrap: pretty;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
}

.md-news_list.news-design-v4 .news-card-excerpt {
  display: -webkit-box;
  margin: 14px 0 0;
  overflow: hidden;
  color: var(--news-text-muted);
  font-size: 14px;
  line-height: 1.7;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.md-news_list.news-design-v4 .news-card:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-bg);
}

.md-news_list.news-design-v4 .news-pagination {
  margin-top: 54px;
}

.md-news_list.news-design-v4 > #timeline {
  margin-top: var(--news-v4-section-space);
}

@keyframes newsV4Rise {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes newsV4Reveal {
  from {
    opacity: 0;
    clip-path: inset(0 0 100% 0);
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    clip-path: inset(0 0 0 0);
    transform: translateY(0);
  }
}

/* 大屏使用单独的编辑式字号档位，避免文字随视口宽度连续缩放。 */
@media (min-width: 1200px) {
  .md-news_list.news-design-v4 .hero-title {
    font-size: 88px;
  }

  .md-news_list.news-design-v4 .category-section .section-title {
    font-size: 58px;
  }

  .md-news_list.news-design-v4 .news-card-title {
    font-size: 23px;
  }

}

/* 紧凑基线：手机、竖屏平板与部分窄大屏共用上下首屏。 */
@media (max-width: 900px) {
  .md-news_list.news-design-v4 .hero {
    padding-top: 88px;
  }

  .md-news_list.news-design-v4 .hero-shell {
    min-height: 0;
    grid-template-columns: minmax(0, 1fr);
    gap: 42px;
  }

  .md-news_list.news-design-v4 .hero-content {
    max-width: 720px;
  }

  .md-news_list.news-design-v4 .hero-media-frame {
    aspect-ratio: 16 / 9;
  }

  .md-news_list.news-design-v4 .category-section .section-copy {
    grid-template-columns: minmax(0, 1fr);
    align-items: start;
    gap: 20px;
  }

  .md-news_list.news-design-v4 .category-section .section-desc {
    max-width: 48em;
  }

  .md-news_list.news-design-v4 .category-section .section-tools {
    grid-template-columns: minmax(0, 1fr);
  }

  .md-news_list.news-design-v4 .news-card-link {
    grid-template-columns: minmax(130px, 0.72fr) minmax(0, 1.28fr);
  }

}

/* 竖屏平板：保留两栏资讯容量，不复制手机单列。 */
@media (min-width: 600px) and (max-width: 833px) and (orientation: portrait) {
  .md-news_list.news-design-v4 {
    --news-v4-gutter: 28px;
    --news-v4-section-space: 80px;
  }

  .md-news_list.news-design-v4 .hero {
    padding-top: 112px;
    padding-bottom: 40px;
  }

  .md-news_list.news-design-v4 .hero-content {
    text-align: left;
  }

  .md-news_list.news-design-v4 .hero-title {
    font-size: 62px;
  }

  .md-news_list.news-design-v4 .stats-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .md-news_list.news-design-v4 .stat-card {
    min-height: 112px;
    padding: 20px 14px;
  }

  .md-news_list.news-design-v4 .stat-number {
    font-size: 28px;
  }

  .md-news_list.news-design-v4 .category-section .section-header {
    margin-bottom: 30px;
  }

  .md-news_list.news-design-v4 .news-pagination {
    margin-top: 0;
    padding-top: 30px;
  }

  .md-news_list.news-design-v4 > #timeline {
    margin-top: 0;
    padding-bottom: 40px;
  }

  .md-news_list.news-design-v4 .news-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 24px;
  }

  .md-news_list.news-design-v4 .news-card-link {
    display: block;
    min-height: 0;
    padding: 24px 0;
  }

  .md-news_list.news-design-v4 .news-card-image {
    margin-bottom: 18px;
    aspect-ratio: 16 / 10;
  }

}

/* 手机竖屏专属：快速扫描的单列图文行。 */
@media (max-width: 599px) {
  .md-news_list.news-design-v4 {
    --news-v4-gutter: 16px;
    --news-v4-section-space: 62px;
  }

  .md-news_list.news-design-v4 .hero {
    padding-top: 92px;
    padding-bottom: 30px;
  }

  .md-news_list.news-design-v4 .stats-section {
    padding-top: 10px;
    padding-bottom: 10px;
  }

  .md-news_list.news-design-v4 > #timeline {
    margin-top: 0;
    padding-bottom: 30px;
  }

  .md-news_list.news-design-v4 .news-pagination {
    margin-top: 15px;
  }

  .md-news_list.news-design-v4 .hero-shell {
    gap: 32px;
  }

  .md-news_list.news-design-v4 .hero-badge {
    margin-bottom: 14px;
    font-size: 13px;
  }

  .md-news_list.news-design-v4 .hero-title {
    font-size: 46px;
  }

  .md-news_list.news-design-v4 .hero-title-accent {
    margin-top: 8px;
    font-size: 0.46em;
  }

  .md-news_list.news-design-v4 .hero-subtitle {
    margin-top: 22px;
    font-size: 16px;
    line-height: 1.75;
  }

  .md-news_list.news-design-v4 .hero-actions {
    display: grid;
    margin-top: 28px;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
  }

  .md-news_list.news-design-v4 .btn-primary,
  .md-news_list.news-design-v4 .btn-secondary {
    width: 100%;
    min-height: 48px;
    padding: 11px 14px;
    font-size: 14px;
  }

  .md-news_list.news-design-v4 .hero-media figcaption {
    display: block;
    margin-top: 10px;
    font-size: 12px;
  }

  .md-news_list.news-design-v4 .hero-media figcaption strong {
    font-size: 14px;
  }

  .md-news_list.news-design-v4 .hero-media figcaption span {
    display: block;
    margin-top: 2px;
  }

  .md-news_list.news-design-v4 .stats-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .md-news_list.news-design-v4 .stat-card {
    min-height: 104px;
    padding: 20px 18px;
  }

  .md-news_list.news-design-v4 .stat-card + .stat-card {
    border-left: 0;
  }

  .md-news_list.news-design-v4 .stat-card:nth-child(even) {
    border-left: 1px solid var(--news-border);
  }

  .md-news_list.news-design-v4 .stat-card:nth-child(n + 3) {
    border-top: 1px solid var(--news-border);
  }

  .md-news_list.news-design-v4 .stat-number {
    font-size: 28px;
  }

  .md-news_list.news-design-v4 .category-section {
    padding-top: var(--news-v4-section-space);
  }

  .md-news_list.news-design-v4 .category-section .section-header {
    margin-bottom: 28px;
  }

  .md-news_list.news-design-v4 .category-section .section-copy {
    padding-bottom: 24px;
  }

  .md-news_list.news-design-v4 .category-section .section-title {
    font-size: 34px;
  }

  .md-news_list.news-design-v4 .category-section .section-desc {
    font-size: 14px;
    line-height: 1.7;
  }

  .md-news_list.news-design-v4 .category-section .section-tools {
    padding-top: 14px;
    gap: 12px;
  }

  .md-news_list.news-design-v4 .category-tabs {
    justify-content: flex-start;
  }

  .md-news_list.news-design-v4 .category-tab {
    flex: 0 0 auto;
    padding-right: 16px;
    padding-left: 16px;
  }

  .md-news_list.news-design-v4 .news-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .md-news_list.news-design-v4 .news-card-link {
    min-height: 0;
    padding: 20px 0;
    grid-template-columns: 112px minmax(0, 1fr);
    align-items: start;
    gap: 16px;
  }

  .md-news_list.news-design-v4 .news-card-image {
    aspect-ratio: 7 / 6;
  }

  .md-news_list.news-design-v4 .news-card-category {
    top: 7px;
    left: 7px;
    max-width: calc(100% - 14px);
    overflow: hidden;
    padding: 4px 7px;
    font-size: 10px;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .md-news_list.news-design-v4 .news-card-meta {
    margin-bottom: 8px;
  }

  .md-news_list.news-design-v4 .news-card-read {
    display: none;
  }

  .md-news_list.news-design-v4 .news-card-title {
    font-size: 16px;
    line-height: 1.45;
    -webkit-line-clamp: 3;
  }

  .md-news_list.news-design-v4 .news-card-excerpt {
    display: none;
  }

}

/* 手机横屏可跨过 834px，用短视口收紧首屏，不改导航断点。 */
@media (min-width: 600px) and (max-height: 520px) {
  .md-news_list.news-design-v4 .hero {
    padding-top: 34px;
    padding-bottom: 40px;
  }

  .md-news_list.news-design-v4 .hero-shell {
    min-height: 0;
    grid-template-columns: minmax(280px, 0.9fr) minmax(0, 1.1fr);
    gap: 24px;
  }

  .md-news_list.news-design-v4 .hero-title {
    font-size: 44px;
  }

  .md-news_list.news-design-v4 .hero-subtitle {
    margin-top: 16px;
    font-size: 14px;
    line-height: 1.55;
  }

  .md-news_list.news-design-v4 .hero-actions {
    margin-top: 20px;
  }

  .md-news_list.news-design-v4 .hero-media-frame {
    aspect-ratio: 16 / 9;
  }
}

@media (prefers-reduced-motion: reduce) {
  .md-news_list.news-design-v4 *,
  .md-news_list.news-design-v4 *::before,
  .md-news_list.news-design-v4 *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-delay: 0ms !important;
    transition-duration: 0.01ms !important;
  }

  .md-news_list.news-design-v4 .hero-media {
    clip-path: none;
    opacity: 1;
    transform: none;
  }
}