.page-news {
  --card-radius: 12px;
  --card-border: 2px;
  --card-padding: 1.25rem;
  --stack-gap: 1rem;
  --section-gap: 2.5rem;
  color: var(--deep-blue);
  font-family: var(--font-body);
}

/* ── 横幅 ── */
.news-hero {
  position: relative;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  overflow: hidden;
  border-radius: 0 0 var(--card-radius) var(--card-radius);
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}
.news-hero-bg {
  display: block;
  width: 100%;
  height: auto;
  max-height: 300px;
  object-fit: cover;
}
.news-hero-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 1.5rem 2rem;
  background: linear-gradient(135deg, rgba(0,51,102,0.75) 0%, rgba(26,26,46,0.6) 100%);
  color: var(--tech-white);
}
.news-breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  margin-bottom: 0.75rem;
  opacity: 0.85;
}
.news-breadcrumb a {
  color: var(--tech-white);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition);
}
.news-breadcrumb a:hover {
  border-color: var(--tech-white);
}
.breadcrumb-sep {
  color: var(--soft-purple);
}
.news-hero-title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 6vw, 3rem);
  font-weight: 800;
  font-style: italic;
  margin: 0;
  letter-spacing: -0.02em;
  text-shadow: 0 2px 8px rgba(0,0,0,0.25);
}
.news-hero-desc {
  font-size: clamp(0.95rem, 2vw, 1.15rem);
  margin-top: 0.4rem;
  letter-spacing: 0.04em;
  opacity: 0.9;
}

/* ── 容器 ── */
.news-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.5rem 1rem 3rem;
}

/* ── 章节 ── */
.news-section {
  margin-bottom: var(--section-gap);
}
.section-header {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
  border-bottom: 2px solid var(--soft-purple);
  padding-bottom: 0.5rem;
}
.section-number {
  font-family: var(--font-data);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--electric-purple);
  line-height: 1;
  letter-spacing: -0.04em;
}
.section-title {
  font-family: var(--font-heading);
  font-size: clamp(1.3rem, 3vw, 1.75rem);
  font-weight: 700;
  font-style: italic;
  margin: 0;
  color: var(--deep-blue);
}

/* ── 通用卡片 ── */
.news-card,
.guide-card,
.insight-card {
  background: var(--tech-white);
  border: var(--card-border) solid var(--deep-blue);
  border-radius: var(--card-radius);
  overflow: hidden;
  box-shadow:
    4px 4px 0 var(--deep-blue),
    8px 8px 12px rgba(0,0,0,0.06);
  transition: transform var(--transition), box-shadow var(--transition);
  display: flex;
  flex-direction: column;
}
.news-card[data-hover="lift"]:hover,
.guide-card[data-hover="lift"]:hover,
.insight-card[data-hover="lift"]:hover {
  transform: translateY(-6px);
  box-shadow:
    4px 6px 0 var(--deep-blue),
    12px 16px 24px rgba(0,0,0,0.10);
}
.card-label {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: var(--card-padding) var(--card-padding) 0;
}
.card-number {
  font-family: var(--font-data);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--electric-purple);
  line-height: 1;
}
.card-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 0.2rem 0.6rem;
  border-radius: 20px;
  text-transform: uppercase;
  border: 1px solid currentColor;
}
.tag-purple {
  color: var(--electric-purple);
  background: rgba(123,45,142,0.08);
  border-color: var(--electric-purple);
}
.tag-orange {
  color: var(--vibrant-orange);
  background: rgba(255,111,0,0.08);
  border-color: var(--vibrant-orange);
}
.tag-data {
  color: var(--deep-blue);
  background: rgba(0,51,102,0.08);
  border-color: var(--deep-blue);
}
.card-media,
.guide-media,
.insight-media {
  padding: var(--card-padding) var(--card-padding) 0;
}
.card-img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: 6px;
  border: 1px solid rgba(0,0,0,0.06);
}
.card-body {
  padding: var(--card-padding);
  flex: 1;
  display: flex;
  flex-direction: column;
}
.card-heading {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  font-style: italic;
  margin: 0 0 0.35rem;
  color: var(--deep-blue);
  line-height: 1.3;
}
.card-summary {
  font-size: 0.9rem;
  line-height: 1.5;
  color: #2a2a3e;
  margin: 0 0 0.75rem;
  flex: 1;
}
.card-link {
  display: inline-flex;
  align-items: center;
  gap: 0.2rem;
  font-family: var(--font-data);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--electric-purple);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), gap var(--transition);
  align-self: flex-start;
}
.card-link:hover {
  border-color: var(--electric-purple);
  gap: 0.5rem;
}
.link-arrow {
  display: inline-block;
  transition: transform var(--transition);
}
.card-link:hover .link-arrow {
  transform: translateX(4px);
}

/* ── 最新动态 ── */
.updates-grid {
  display: flex;
  flex-direction: column;
  gap: var(--stack-gap);
}
.card-featured {
  border-color: var(--electric-purple);
  box-shadow:
    4px 4px 0 var(--electric-purple),
    8px 8px 16px rgba(0,0,0,0.06);
}
.card-featured[data-hover="lift"]:hover {
  box-shadow:
    4px 6px 0 var(--electric-purple),
    12px 16px 28px rgba(0,0,0,0.10);
}
.card-stack {
  display: flex;
  flex-direction: column;
  gap: var(--stack-gap);
}
.card-secondary .card-body {
  padding-top: 0.5rem;
}
.card-secondary .card-label {
  padding-bottom: 0;
}

/* ── 使用指南 ── */
.guides-grid {
  display: flex;
  flex-direction: column;
  gap: var(--stack-gap);
}
.guide-step {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: var(--card-padding) var(--card-padding) 0;
}
.step-badge {
  font-family: var(--font-data);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--tech-white);
  background: var(--deep-blue);
  padding: 0.15rem 0.7rem;
  border-radius: 20px;
  letter-spacing: 0.02em;
}
.guide-card .card-body {
  padding-top: 0.75rem;
}

/* ── 数据洞察 ── */
.insights-grid {
  display: flex;
  flex-direction: column;
  gap: var(--stack-gap);
}
.insight-tag {
  font-family: var(--font-data);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--deep-space-gray);
  line-height: 1;
}
.insight-media-alt {
  padding: var(--card-padding) var(--card-padding) 0;
}
.data-pattern {
  width: 100%;
  height: auto;
  background: rgba(0,51,102,0.04);
  border-radius: 6px;
  border: 1px solid rgba(0,0,0,0.06);
  overflow: hidden;
  aspect-ratio: 350 / 200;
}
.pattern-svg {
  display: block;
  width: 100%;
  height: 100%;
}
.card-details {
  margin-top: 0.25rem;
}
.details-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-family: var(--font-data);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--electric-purple);
  cursor: pointer;
  list-style: none;
  padding: 0.2rem 0;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition);
}
.details-toggle::-webkit-details-marker {
  display: none;
}
.details-toggle:hover {
  border-color: var(--electric-purple);
}
.card-details[open] .details-toggle .link-arrow {
  transform: rotate(180deg);
}
.details-content {
  margin-top: 0.6rem;
  padding: 0.75rem 1rem;
  background: rgba(123,45,142,0.04);
  border-left: 3px solid var(--electric-purple);
  border-radius: 0 6px 6px 0;
  font-size: 0.88rem;
  line-height: 1.55;
  color: #1a1a2e;
}
.details-content p {
  margin: 0;
}

/* ── 桌面端 (≥768px) ── */
@media (min-width: 768px) {
  .page-news {
    --card-padding: 1.5rem;
    --stack-gap: 1.25rem;
    --section-gap: 3.5rem;
  }
  .news-hero-overlay {
    padding: 2rem 3rem;
  }
  .news-hero-title {
    font-size: 2.8rem;
  }
  .news-container {
    padding: 2rem 1.5rem 4rem;
  }
  .section-header {
    margin-bottom: 2rem;
  }
  .section-number {
    font-size: 2.2rem;
  }
  .section-title {
    font-size: 1.8rem;
  }

  /* 最新动态：不对称双列 */
  .updates-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    gap: 1.25rem;
  }
  .card-featured {
    grid-column: 1 / 2;
  }
  .card-stack {
    grid-column: 2 / 3;
    gap: 1.25rem;
  }

  /* 使用指南：三列 */
  .guides-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
  }

  /* 数据洞察：两列 */
  .insights-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
  }

  .card-heading {
    font-size: 1.15rem;
  }
  .card-summary {
    font-size: 0.92rem;
  }
}

/* ── 大桌面 (≥1024px) ── */
@media (min-width: 1024px) {
  .page-news {
    --card-padding: 1.75rem;
    --stack-gap: 1.5rem;
    --section-gap: 4rem;
  }
  .news-hero-overlay {
    padding: 2.5rem 4rem;
  }
  .news-hero-title {
    font-size: 3.2rem;
  }
  .news-container {
    padding: 2.5rem 2rem 5rem;
  }
  .updates-grid {
    gap: 1.5rem;
  }
  .card-stack {
    gap: 1.5rem;
  }
  .guides-grid {
    gap: 1.5rem;
  }
  .insights-grid {
    gap: 1.5rem;
  }
  .section-number {
    font-size: 2.5rem;
  }
  .section-title {
    font-size: 2rem;
  }
  .card-heading {
    font-size: 1.25rem;
  }
}