body {
    margin: 0;
    font-family: Arial, sans-serif;
    background-color: #111; /* Σκούρο φόντο για όλη τη σελίδα */
    color: white;
}
header {
    background-color: #000; /* Μαύρο background */
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 5%;
    position: relative;
    z-index: 10;
}

header div {
    text-align: left; 
}

.hero-section {
    height: 600px;
    overflow: hidden;
    position: relative;
}

.login-container {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%); 
    background-color: rgba(0, 0, 0, 0.7); 
    padding: 40px;
    border-radius: 10px;
    width: 100%;
    max-width: 350px;
    text-align: center;
}

footer {
    background-color: #000;
    padding: 20px;
    text-align: center;
    font-size: 14px;
}
.overlay {
    background-color: rgba(0, 0, 0, 0.6);
    min-height: 100vh; 
    width: 100%;
    padding-top: 50px;
    box-sizing: border-box;
}
h1 {
    font-size: 50px;
    margin-bottom: 20px;
}

h2 {
    margin-top: 20px;
}
nav ul {
    display: flex;
    gap: 25px;
    list-style: none;
    padding: 0;
    margin-top: 10px;
}
nav ul li {
    display: inline;
    margin: 10px;
}
a {
    color: white;
    text-decoration: none;
    font-weight: bold;
}

a:hover {
    text-decoration: underline;
}
form {
    margin-top: 30px;
}

input {
    padding: 12px 15px;
    margin: 10px 0;
    border-radius: 5px;
    border: 1px solid rgba(255, 255, 255, 0.3); 
    background-color: rgba(255, 255, 255, 0.15); 
    color: white;
    width: 250px; 
    outline: none;
    display: block; 
    margin-left: auto;
    margin-right: auto;
}

input::placeholder {
    color: rgba(255, 255, 255, 0.6);
}

input[type="submit"] {
    background-color: rgba(255, 255, 255, 0.3); 
    cursor: pointer;
    font-weight: bold;
    width: 282px; 
    transition: 0.3s;
}

input[type="submit"]:hover {
    background-color: rgba(255, 255, 255, 0.5); 
}
.tagline {
    margin: 0;
    font-style: italic;
}