:root {
  --hacker-main: #00ffea;
  --bg-dark: #10141a;
  --bg-light: #181c23;
  --text-main: #e0e0e0;
  --text-sub: #7fffd4;
  --border: #222;
  --shadow: 0 2px 16px 0 rgba(0,255,234,0.08);
}

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg-dark);
  color: var(--text-main);
  font-family: 'Fira Mono', 'Consolas', 'Menlo', monospace;
  min-height: 100vh;
}

header {
  background: var(--bg-light);
  box-shadow: var(--shadow);
  padding: 0 32px;
  display: flex;
  align-items: center;
  height: 64px;
  position: sticky;
  top: 0;
  z-index: 100;
}

.logo {
  font-size: 2rem;
  font-weight: bold;
  color: var(--hacker-main);
  letter-spacing: 2px;
  margin-right: 48px;
  text-shadow: 0 0 8px var(--hacker-main);
}

#main-nav {
  display: flex;
  gap: 32px;
  flex: 1;
}

.nav-item {
  position: relative;
  display: flex;
  align-items: center;
  z-index: 100; /* 确保父元素有足够的层级 */
}

.nav-item > a {
  color: var(--hacker-main);
  text-decoration: none;
  font-size: 1.1rem;
  padding: 12px 18px;
  border-radius: 6px;
  transition: background 0.2s, color 0.2s;
  font-weight: 600;
}

.nav-item > a:hover,
.nav-item > a:focus {
  background: var(--hacker-main);
  color: #181c23;
  box-shadow: 0 0 8px var(--hacker-main);
}

.dropdown {
  display: none;
  position: absolute;
  top: 48px;
  left: 0;
  background: var(--bg-light);
  border: 1px solid var(--hacker-main);
  border-radius: 8px;
  min-width: 180px;
  box-shadow: 0 4px 24px 0 rgba(0,255,234,0.15);
  z-index: 1000; /* 确保下拉菜单有足够高的层级 */
  flex-direction: column;
  padding: 8px 0;
}

.nav-item:hover .dropdown,
.nav-item:focus-within .dropdown {
  display: flex;
}

.dropdown a {
  color: var(--text-main);
  text-decoration: none;
  padding: 10px 22px;
  font-size: 1rem;
  border-radius: 4px;
  transition: background 0.2s, color 0.2s;
  white-space: nowrap;
}

.dropdown a:hover,
.dropdown a:focus {
  background: var(--hacker-main);
  color: #181c23;
}

main {
  max-width: 900px;
  margin: 48px auto 0 auto;
  padding: 32px 24px 64px 24px;
  background: rgba(24,28,35,0.95);
  border-radius: 16px;
  box-shadow: var(--shadow);
}

.intro h1 {
  color: var(--hacker-main);
  font-size: 2.2rem;
  margin-bottom: 12px;
  text-shadow: 0 0 8px var(--hacker-main);
}

.accounts {
  margin: 18px 0 0 0;
  display: flex;
  gap: 18px;
}

.accounts a {
  color: var(--hacker-main);
  text-decoration: none;
  font-weight: bold;
  border-bottom: 2px solid var(--hacker-main);
  transition: color 0.2s, border 0.2s;
}

.accounts a:hover {
  color: #181c23;
  background: var(--hacker-main);
  border-radius: 4px;
  padding: 2px 8px;
}

.about, .blog-desc {
  margin-top: 32px;
}

h2 {
  color: var(--hacker-main);
  margin-bottom: 10px;
  font-size: 1.4rem;
  text-shadow: 0 0 6px var(--hacker-main);
}

ul {
  padding-left: 22px;
}

footer {
  text-align: center;
  color: var(--text-sub);
  background: transparent;
  margin: 48px 0 0 0;
  font-size: 1rem;
  letter-spacing: 1px;
  text-shadow: 0 0 6px var(--hacker-main);
}

.back-home {
  margin: 24px 0 0 0;
  text-align: left;
}
.back-home a {
  display: inline-block;
  color: var(--hacker-main);
  background: #181c23;
  border: 1.5px solid var(--hacker-main);
  border-radius: 6px;
  padding: 6px 18px;
  font-size: 1rem;
  font-family: inherit;
  font-weight: bold;
  text-decoration: none;
  box-shadow: 0 0 8px var(--hacker-main);
  transition: background 0.2s, color 0.2s, box-shadow 0.2s;
}
.back-home a:hover {
  background: var(--hacker-main);
  color: #181c23;
  box-shadow: 0 0 16px var(--hacker-main);
}

.recent-posts ul {
  padding-left: 0;
  list-style: none;
}

.recent-posts li {
  padding: 10px 0;
  border-bottom: 1px solid #333;
}

.recent-posts a {
  color: var(--hacker-main);
  text-decoration: none;
  font-weight: bold;
  transition: color 0.2s;
}

.recent-posts a:hover {
  color: var(--text-sub);
  text-decoration: underline;
}