/* 基础设置 */
* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: #202020;
  background: #fff;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", sans-serif;
}

/* 页头与栏目 */
header {
  border-top: 4px solid #a31720;
  border-bottom: 1px solid #ddd;
  padding: 24px max(24px, calc((100vw - 1100px) / 2));
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  font-family: Georgia, "Songti SC", serif;
  font-size: 24px;
  font-weight: 900;
  letter-spacing: 2px;
  color: #971b25;
}

.tag {
  font-size: 13px;
  color: #777;
  letter-spacing: 1px;
}

.nav {
  max-width: 1100px;
  margin: auto;
  padding: 14px 24px;
  border-bottom: 1px solid #ddd;
  color: #666;
  font-size: 14px;
  word-spacing: 24px;
}

.nav b {
  color: #a31720;
}

/* 新闻正文 */
main {
  max-width: 840px;
  margin: 0 auto;
  padding: 32px 24px 48px;
}

.eyebrow {
  color: #a31720;
  font-size: 13px;
  margin: 0 0 19px;
}

h1 {
  font-family: Georgia, "Songti SC", serif;
  font-size: clamp(27px, 4vw, 40px);
  line-height: 1.45;
  font-weight: 750;
  margin: 0 0 18px;
}

.byline {
  color: #888;
  font-size: 12px;
  padding-bottom: 20px;
  border-bottom: 1px solid #e5e5e5;
  margin-bottom: 24px;
}

.intro {
  font-size: 17px;
  line-height: 1.9;
  color: #444;
  margin: 0 0 24px;
}

/* 视频与说明 */
video {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: contain;
  background: #111;
}

.caption {
  font-size: 12px;
  line-height: 1.8;
  color: #888;
  margin: 10px 0 24px;
}

/* 信息与下载 */
.bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  padding: 20px 0;
  border-top: 1px solid #e5e5e5;
}

.meta {
  display: flex;
  gap: 30px;
  color: #888;
  font-size: 12px;
  line-height: 1.8;
}

.meta strong {
  display: block;
  color: #444;
  font-size: 13px;
  font-weight: 500;
}

.download {
  white-space: nowrap;
  display: inline-block;
  color: #a31720;
  border: 1px solid #bd6b70;
  padding: 9px 14px;
  text-decoration: none;
  font-size: 13px;
}

.download:hover {
  background: #fff3f3;
}

/* 页脚与状态 */
footer {
  border-top: 1px solid #ddd;
  padding-top: 18px;
  font-size: 12px;
  color: #999;
  line-height: 1.9;
  display: flex;
  justify-content: space-between;
  gap: 15px;
}

footer a {
  color: #666;
}

#error {
  color: #a31720;
}

a:focus-visible,
video:focus-visible {
  outline: 2px solid #a31720;
  outline-offset: 4px;
}

/* 手机屏幕 */
@media (max-width: 600px) {
  header {
    padding: 20px;
  }

  .brand {
    font-size: 20px;
    line-height: 1.5;
  }

  .tag {
    font-size: 10px;
  }

  .nav {
    padding: 13px 20px;
    font-size: 13px;
    word-spacing: 14px;
  }

  main {
    padding: 24px 20px;
  }

  .meta {
    gap: 16px;
    flex-wrap: wrap;
  }

  .bottom {
    align-items: flex-start;
  }

  footer {
    flex-direction: column;
  }
}