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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
}

.header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 1rem 2rem;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-link {
    text-decoration: none;
    color: #4a5568;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.nav-link:hover {
    color: #667eea;
    background: rgba(102, 126, 234, 0.1);
}

.nav-separator {
    color: #e2e8f0;
    font-weight: 300;
}

.main {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1rem;
}

.flash-messages {
    margin-bottom: 2rem;
}

.flash-message {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 1rem 1.5rem;
    border-radius: 12px;
    margin-bottom: 0.5rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    border-left: 4px solid #667eea;
}

@media (max-width: 768px) {
    .header {
        padding: 1rem;
    }
    
    .nav {
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .nav-separator {
        display: none;
    }
    
    .main {
        margin: 1rem auto;
        padding: 0 0.5rem;
    }
}

@media (max-width: 480px) {
    .nav-link {
        padding: 0.4rem 0.8rem;
        font-size: 0.9rem;
    }
    
    .flash-message {
        padding: 0.8rem 1rem;
        font-size: 0.9rem;
    }
}