:root {
    --primary-color: rgba(116,192,149);
    --secondary-color: rgba(44, 86, 152);
    --dark-color: #333;
    --light-color: #f4f4f4;
    --danger-color: #dc3545;
    --success-color: #28a745;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

header {
    background-color: var(--light-color);
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

a.logo {
    margin-bottom: 1rem;
    margin-left: 10em;
}

main {
    min-height: calc(100vh - 160px);
}

footer {
    padding: 1rem 0;
    background-color: var(--dark-color);
    color: white;
    text-align: center;
}

.btn {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    text-decoration: none;
    transition: opacity 0.3s;
    font-size: 1em;
}

.btn:hover {
    opacity: 0.9;
}

.welcome-section {
    text-align: center;
    margin: 3rem 0;
    background-color: #fbf7f7;
    border-radius: 10px;
    padding-top: 40px;
    padding-bottom: 40px;
}

.welcome-section h1 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.welcome-section .img-cntr {
    padding-top: 20px;
    padding-bottom: 40px;
}

.welcome-section img {
    width: 250px;
    height: auto;
}

.login-button {
    display: inline-block;
    font-size: 1.2rem;
    padding: 15px 40px;
    background-color: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: 5px;
    transition: background-color 0.3s, transform 0.3s;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.login-button:hover {
    background-color: var(--secondary-color);
    transform: translateY(-3px);
}

.auth-required-message {
    display: none;
    background-color: #fff3cd;
    color: #856404;
    padding: 1rem;
    border-radius: 5px;
    margin-top: 1rem;
    border-left: 4px solid #ffc107;
}

/* Tablet (768px - 1024px) */
@media (max-width: 1024px) {
    a.logo {
        margin-left: 2rem;
    }

    .welcome-section h1 {
        font-size: 1.8rem;
    }

    .welcome-section img {
        width: 180px;
    }

    .login-button {
        font-size: 1rem;
        padding: 12px 30px;
    }
}

/* Mobile (<768px) */
@media (max-width: 767px) {
    a.logo {
        margin-left: 1rem;
    }

    .welcome-section {
        padding-top: 25px;
        padding-bottom: 25px;
        margin: 1.5rem 0;
    }

    .welcome-section h1 {
        font-size: 1.3rem;
        margin-bottom: 1rem;
    }

    .welcome-section .img-cntr {
        padding-top: 15px;
        padding-bottom: 20px;
    }

    .welcome-section img {
        width: 120px;
    }

    .login-button {
        font-size: 0.9rem;
        padding: 10px 25px;
    }
}