/* ===== 版本信息页面专属样式 ===== */
.page-news {
  padding: 2rem 1rem;
  max-width: var(--max-width);
  margin: 0 auto;
  background: var(--color-primary);
  color: #fff;
  position: relative;
  overflow: hidden;
  font-family: var(--font-body);
}
.page-news::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(circle at 20% 30%, rgba(212, 175, 55, 0.06) 0%, transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(0, 0, 0, 0.12) 0%, transparent 50%);
  animation: particleDrift 12s ease-in-out infinite alternate;
}
@keyframes particleDrift {
  0% { transform: translate(0, 0); }
  100% { transform: translate(20px, -20px); }
}
.page-news > * {
  position: relative;
  z-index: 1;
}
.breadcrumb {
  font-size: 0.875rem;
  margin-bottom: 1.5rem;
  color: #aaa;
  font-family: var(--font-body);
}
.breadcrumb a {
  color: var(--color-accent);
  text-decoration: none;
}
.breadcrumb a:hover {
  text-decoration: underline;
}
.breadcrumb [aria-current="page"] {
  color: #fff;
}
.page-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 2.25rem;
  margin-bottom: 2rem;
  color: var(--color-accent);
  letter-spacing: 0.02em;
}
.version-layout {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}
@media (min-width: 768px) {
  .version-layout {
    flex-direction: row;
  }
  .floor-index {
    flex: 0 0 220px;
    position: sticky;
    top: calc(var(--header-height, 100px) + 2rem);
    align-self: flex-start;
  }
  .timeline-content {
    flex: 1;
    min-width: 0;
  }
}
/* 楼层索引 */
.floor-index {
  background: var(--color-secondary);
  padding: 1.5rem;
  border-radius: 6px;
  border: 1px solid var(--color-border);
}
.index-heading {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.25rem;
  margin-bottom: 1rem;
  color: var(--color-accent);
}
.index-icon {
  width: 40px;
  height: auto;
  border-radius: 4px;
}
.index-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.index-list li {
  margin-bottom: 0.75rem;
}
.index-list a {
  color: #ddd;
  text-decoration: none;
  font-size: 1rem;
  transition: color 0.2s;
  display: block;
  padding: 0.3rem 0.5rem;
  border-left: 2px solid transparent;
}
.index-list a:hover,
.index-list a:focus {
  color: var(--color-accent);
  border-left-color: var(--color-accent);
}
/* 时间轴 */
.timeline-start {
  margin-bottom: 2rem;
}
.timeline-hero {
  width: 100%;
  max-width: 800px;
  height: auto;
  border-radius: 6px;
  display: block;
}
.timeline {
  position: relative;
  padding-left: 2rem;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-accent);
}
.timeline-item {
  position: relative;
  margin-bottom: 2.5rem;
}
.timeline-node {
  position: absolute;
  left: calc(-2rem - 0.5rem);
  top: 1rem;
  width: 1rem;
  height: 1rem;
  border-radius: 50%;
  background: var(--color-accent);
  border: 2px solid var(--color-primary);
  box-shadow: 0 0 0 2px var(--color-primary), 0 0 0 4px var(--color-accent);
}
.card {
  background: var(--color-secondary);
  border: 1px solid var(--color-border);
  padding: 1.5rem;
  border-radius: 6px;
  transition: box-shadow 0.3s;
}
.card:hover {
  box-shadow: 0 4px 20px rgba(0,0,0,0.4);
}
.card h3 {
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
  font-size: 1.375rem;
}
.card p {
  color: #ccc;
  line-height: 1.6;
  margin-bottom: 0.5rem;
}
.detail-text {
  display: none;
  margin-top: 1rem;
  background: rgba(0,0,0,0.2);
  padding: 1rem;
  border-radius: 4px;
  color: #ddd;
  font-size: 0.9375rem;
}
.card:hover .detail-text {
  display: block;
}
.card-img {
  max-width: 100%;
  height: auto;
  border-radius: 4px;
  margin-top: 1rem;
}
.btn {
  display: inline-block;
  padding: 0.5rem 1.25rem;
  border-radius: 4px;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.9375rem;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.2s, box-shadow 0.2s;
  border: none;
}
.btn-cta {
  background: var(--color-cta);
  color: #fff;
}
.btn-cta:hover {
  background: #e55a2b;
}
.btn-primary {
  background: transparent;
  color: var(--color-accent);
  border: 1px solid var(--color-accent);
}
.btn-primary:hover {
  background: var(--color-accent);
  color: var(--color-primary);
}
/* 版本对照区域 */
.version-compare {
  margin-top: 3rem;
  padding: 2rem 1rem;
  background: var(--color-secondary);
  border-radius: 6px;
  border: 1px solid var(--color-border);
}
.version-compare h2 {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--color-accent);
  margin-bottom: 1.5rem;
}
.compare-controls {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}
.compare-panels {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}
@media (min-width: 600px) {
  .compare-panels {
    grid-template-columns: 1fr 1fr;
  }
}
.compare-panel {
  background: var(--color-primary);
  padding: 1.25rem;
  border-radius: 4px;
  border-left: 4px solid var(--color-accent);
}
.compare-panel h3 {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
}
.compare-panel p {
  color: #ccc;
  font-size: 0.9375rem;
  line-height: 1.6;
}
/* 装饰背景 */
.decorative-bg {
  margin-top: 2rem;
  text-align: center;
}
.decorative-bg img {
  max-width: 100%;
  height: auto;
  border-radius: 6px;
  opacity: 0.3;
}
/* 响应式补充 */
@media (max-width: 767px) {
  .page-news {
    padding: 1.5rem 1rem;
  }
  .page-title {
    font-size: 1.75rem;
  }
  .timeline {
    padding-left: 1.5rem;
  }
  .timeline-node {
    left: calc(-1.5rem - 0.5rem);
  }
  .floor-index {
    margin-bottom: 1.5rem;
  }
  .timeline-hero {
    max-width: 100%;
  }
}
/* 确保楼层索引链接点击滚动平滑（全局也需配合） */
@media (prefers-reduced-motion: reduce) {
  .page-news::before {
    animation: none;
  }
}