/** 全局 */
a {
  text-decoration: none;
}
a:hover {
  text-decoration: overline;
}

/** 标题菜单样式 - 科技感优化 */
header {
  height: 10em;
  background-position-y: 10em;
  background-image: 
    linear-gradient(to bottom, rgba(255,255,255,0.1) 0%, rgba(0,0,0,0.8) 30%, #1a237e 60%, #311b92 80%, #4a148c 100%),
    radial-gradient(circle at 50% 20%, rgba(0,255,255,0.3) 0%, transparent 50%);
  border-radius: 0 0 9em 0;
  box-shadow: 
    0 4px 20px rgba(0,0,0,0.5),
    inset 0 1px 0 rgba(255,255,255,0.1);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255,255,255,0.1);
}

header nav ul {
  position: absolute;
  top: 0;
  right: 0;
  z-index: 10;
}
header nav ul li {
  float: right;
  margin: 0;
  margin-right: 1.5em;
  z-index: 10;
  background: rgba(255,255,255,0.1);
  border-radius: 20px;
  border: 1px solid rgba(0,255,255,0.3);
  transition: all 0.3s ease;
}

header nav ul li:hover {
  background: rgba(255,255,255,0.2);
  border-color: #0ff;
  box-shadow: 0 0 15px rgba(0,255,255,0.5);
}

header nav ul li a, header nav ul li a:hover {
  color: #fff;
  font-size: 1em;
  font-weight: 600;
  line-height: 2.5em;
  padding: 0 1em;
  text-shadow: 0 0 5px rgba(0,255,255,0.8);
}

header nav ul li:nth-child(odd){
  margin-top: 2.5em;
}

header nav ul li:nth-child(odd) a{
  color: #0ff;
  text-shadow: 0 0 8px rgba(0,255,255,1);
}

/** 主页标题 - 科技感优化 */
header nav div.title {
  position: absolute;
  top: 1.25em;
  left: 1.25em;
  padding-left: 1.5em;
  color: #fff;
  font-size: 3em;
  font-weight: 700;
  text-shadow: 
    0 0 10px #0ff,
    0 0 20px #0ff,
    2px 2px 4px rgba(0,0,0,0.8);
  background-image: url(../png/logo.png);
  background-size: 1.2em;
  background-repeat: no-repeat;
  background-position: left center;
  z-index: 10;
  animation: titleGlow 3s ease-in-out infinite alternate;
}

@keyframes titleGlow {
  0% { text-shadow: 0 0 10px #0ff, 0 0 20px #0ff, 2px 2px 4px rgba(0,0,0,0.8); }
  100% { text-shadow: 0 0 15px #0ff, 0 0 30px #0ff, 2px 2px 6px rgba(0,0,0,0.8); }
}

header nav div.title a, header nav div.title a:hover, header nav div.title a:active {
  color: #fff;
  text-decoration: none;
  transition: text-shadow 0.3s ease;
}

header nav div.title a:hover {
  text-shadow: 0 0 20px #0ff, 0 0 40px #0ff, 3px 3px 8px rgba(0,0,0,0.8);
}

/** Markdown列表样式 */
div.markdown {
  width: 100%;
  height: calc(100% - 10em);
  padding: 0 10px;
  box-sizing: border-box;
  overflow-y: auto; /* 允许垂直滚动 */
  background: rgba(0, 0, 0, 0.1); /* 改为深色半透明背景，避免白屏闪烁 */
}
div.markdown ul {
  background-color: rgba(69,142,209,.04);
}
div.markdown .title {
  text-align: right;
}
div.markdown a {
  display: block;
  margin: 1em;
}
div.markdown a:hover {
  text-decoration: underline;
}

/** Markdown样式 */
h2, h3{
  text-align: center;
}
h2, h3, h4, h5, h6 {
  color: #90caf9;
}

blockquote {
  background-color: #2333;
}

p {
  text-indent: 2em;
  margin: 0 0 1em 0;
  padding: 0;
  line-height: 1.6;
}

div.markdown {
  line-height: 1.6;
}

img {
  max-width: calc(100% - 40px);
}

p::first-letter {
  font-weight: 600;
}