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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: #f5f8fa;
  color: #2d3436;
  line-height: 1.6;
}

header {
  background: linear-gradient(135deg, #1a3a5a, #2c7a9e);
  color: white;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.header-left {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.logo {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  object-fit: cover;
  box-shadow: 0 2px 6px rgba(0,0,0,0.2);
}

header h1 {
  font-size: 1.8rem;
  margin: 0;
  text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

header p {
  font-size: 0.9rem;
  margin: 0;
  opacity: 0.9;
}

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

.lang-switch button {
  background: #d4af37;
  color: #2c3e50;
  border: none;
  padding: 0.5rem 0.75rem;
  border-radius: 4px;
  cursor: pointer;
  font-weight: bold;
  transition: all 0.3s ease;
  font-size: 0.9rem;
}

.lang-switch button.active {
  background: #27ae60;
  color: white;
}

nav {
  background: #ffffff;
  padding: 1rem 0;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  position: sticky;
  top: 0;
  z-index: 100;
}

nav ul {
  display: flex;
  justify-content: center;
  list-style: none;
  flex-wrap: wrap;
  gap: 1.5rem;
  padding: 0 1rem;
}

nav a {
  color: #2c3e50;
  text-decoration: none;
  font-weight: 600;
  padding: 0.5rem 1rem;
  border-radius: 4px;
  transition: all 0.3s ease;
}

nav a:hover,
nav a.active {
  background: #d4af37;
  color: #2c3e50;
  box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

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

section {
  margin-bottom: 3rem;
  padding: 2rem;
  background: white;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

section h2 {
  color: #27ae60;
  margin-bottom: 1rem;
  border-bottom: 2px solid #3498db;
  padding-bottom: 0.5rem;
  display: inline-block;
}

.hero-img {
  width: 100%;
  max-width: 800px;
  margin: 1rem auto;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  object-fit: cover;
}

.agenda {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.day {
  background: #e8f5e9;
  padding: 1.5rem;
  border-radius: 8px;
  border-left: 4px solid #27ae60;
}

.day h3 {
  color: #2c3e50;
  margin-bottom: 1rem;
}

.event {
  background: white;
  padding: 0.75rem;
  margin: 0.5rem 0;
  border-radius: 4px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.05);
}

.map {
  width: 100%;
  height: 400px;
  background: #e0f7fa;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: #2c3e50;
  margin: 1.5rem 0;
}

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

.member,
.sponsor {
  background: #f8f9fa;
  padding: 1.5rem;
  border-radius: 8px;
  text-align: center;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.member img,
.sponsor img {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  object-fit: cover;
  margin-bottom: 0.5rem;
}

footer {
  text-align: center;
  padding: 1.5rem;
  background: #1a3a5a;
  color: white;
  margin-top: 3rem;
}

.hidden {
  display: none;
}

@media (max-width: 768px) {
  header {
    flex-direction: column;
    text-align: center;
    gap: 0.5rem;
  }
  .header-left {
    flex-direction: column;
    align-items: center;
  }
  nav ul {
    flex-direction: column;
    gap: 0.5rem;
  }
  .hero-img {
    max-width: 100%;
  }
}