/* Header Styles */
.header {
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
    color: white;
    padding: 20px 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.header .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav {
    display: flex;
    gap: 25px;
}

.nav a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: opacity 0.3s;
}

.nav a:hover {
    opacity: 0.8;
}

.logo {
    font-size: 28px;
    font-weight: 700;
    flex: 1;
    text-align: center;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 15px;
}

.datetime {
    font-size: 14px;
    color: rgba(255,255,255,0.9);
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 2px;
    min-width: 120px;
}

.auth-section {
    display: flex;
    gap: 10px;
}

.auth-btn {
    padding: 8px 20px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s;
}

.login-btn {
    background: rgba(255,255,255,0.2);
    color: white;
}

.login-btn:hover {
    background: rgba(255,255,255,0.3);
}

.register-btn {
    background: white;
    color: #667eea;
}

.register-btn:hover {
    background: rgba(255,255,255,0.9);
}