/* Cu Language Website Styles */
:root {
  --primary: #021AA6;
  --accent: #2ED3FB;
  --white: #ffffff;
  --black: #000000;
  --light-bg: #f8f9fa;
  --gray: #666666;
  --border: #e0e0e0;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  color: var(--black);
  background: var(--white);
  line-height: 1.6;
}

a {
  color: var(--primary);
  text-decoration: none;
}

a:hover {
  color: var(--accent);
}

header {
  background: var(--white);
  border-bottom: 2px solid var(--accent);
  padding: 1rem 2rem;
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.5rem;
  font-weight: bold;
  color: var(--primary);
}

.logo img {
  height: 48px;
  width: auto;
}

nav ul {
  display: flex;
  list-style: none;
  gap: 1.5rem;
}

nav a {
  font-weight: 500;
  color: var(--black);
  padding: 0.5rem 0;
  border-bottom: 2px solid transparent;
}

nav a:hover, nav a.active {
  color: var(--primary);
  border-bottom-color: var(--accent);
}

.lang-switch {
  display: flex;
  gap: 0.5rem;
}

.lang-switch a {
  padding: 0.25rem 0.5rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 0.875rem;
}

.lang-switch a.active {
  background: var(--primary);
  color: var(--white);
  border-color: var(--primary);
}

main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

footer {
  background: var(--light-bg);
  border-top: 1px solid var(--border);
  padding: 2rem;
  text-align: center;
  color: var(--gray);
  margin-top: 4rem;
}

/* Hero */
.hero {
  text-align: center;
  padding: 4rem 2rem;
  background: linear-gradient(135deg, var(--white) 0%, #e6f7ff 100%);
  border-radius: 12px;
  margin-bottom: 3rem;
}

.hero h1 {
  font-size: 3rem;
  color: var(--primary);
  margin-bottom: 1rem;
}

.hero p {
  font-size: 1.25rem;
  max-width: 600px;
  margin: 0 auto 2rem;
  color: var(--black);
}

.btn {
  display: inline-block;
  background: var(--primary);
  color: var(--white);
  padding: 0.75rem 1.5rem;
  border-radius: 6px;
  font-weight: 600;
  transition: background 0.2s;
}

.btn:hover {
  background: var(--accent);
  color: var(--black);
}

/* Sections */
section {
  margin-bottom: 3rem;
}

h2 {
  color: var(--primary);
  border-bottom: 3px solid var(--accent);
  padding-bottom: 0.5rem;
  margin-bottom: 1.5rem;
  font-size: 2rem;
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
}

.feature-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.5rem;
  box-shadow: 0 2px 8px rgba(2, 26, 166, 0.05);
}

.feature-card h3 {
  color: var(--primary);
  margin-bottom: 0.5rem;
}

/* Blog */
.blog-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.blog-item {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.5rem;
  background: var(--white);
}

.blog-item h3 {
  color: var(--primary);
  margin-bottom: 0.5rem;
}

.blog-meta {
  color: var(--gray);
  font-size: 0.875rem;
  margin-bottom: 0.75rem;
}

/* Docs */
.docs-nav {
  background: var(--light-bg);
  padding: 1rem;
  border-radius: 8px;
  margin-bottom: 2rem;
}

.docs-content h3 {
  color: var(--primary);
  margin-top: 1.5rem;
}

code, pre {
  background: #f4f4f4;
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
  font-family: 'Courier New', monospace;
}

pre {
  padding: 1rem;
  overflow-x: auto;
  border-left: 4px solid var(--accent);
}

/* Versions */
.version-group {
  margin-bottom: 2rem;
  border-left: 4px solid var(--accent);
  padding-left: 1rem;
}

.version-group h3 {
  color: var(--primary);
  font-size: 1.5rem;
}

.sub-group {
  margin-left: 1rem;
  margin-top: 1rem;
}

.version-item {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
  margin: 0.5rem 0;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.shield {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: var(--white);
  padding: 0.5rem 1rem;
  border-radius: 20px 20px 4px 4px;
  font-weight: bold;
  min-width: 80px;
  text-align: center;
  clip-path: polygon(0 0, 100% 0, 100% 70%, 50% 100%, 0 70%);
  position: relative;
}

.shield.old {
  background: linear-gradient(135deg, #888, #ccc);
  color: var(--black);
}

.dates {
  font-size: 0.875rem;
  color: var(--gray);
}

/* Timeline / Calendar */
.timeline {
  position: relative;
  margin: 2rem 0;
  padding-left: 2rem;
  border-left: 3px solid var(--accent);
}

.timeline-item {
  margin-bottom: 2rem;
  position: relative;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -2.6rem;
  top: 0.5rem;
  width: 16px;
  height: 16px;
  background: var(--accent);
  border-radius: 50%;
  border: 3px solid var(--white);
}

.timeline-shield {
  display: inline-block;
  margin-bottom: 0.5rem;
}

/* Sitemap */
.sitemap ul {
  list-style: none;
  padding-left: 1.5rem;
}

.sitemap > ul {
  padding-left: 0;
}

.sitemap li {
  margin: 0.5rem 0;
}

.sitemap a {
  color: var(--primary);
}

/* Responsive */
@media (max-width: 768px) {
  header {
    flex-direction: column;
    gap: 1rem;
  }
  nav ul {
    flex-wrap: wrap;
    justify-content: center;
  }
  .hero h1 {
    font-size: 2rem;
  }
  main {
    padding: 1rem;
  }
}