/* General Body Styles */
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: #f4f7f6;
    margin: 0;
    color: #333;
    line-height: 1.6;
}

.container {
    width: 100%;
    max-width: 960px;
    margin: 0 auto;
    padding: 0 20px;
    box-sizing: border-box;
}

/* Login and Register Page Styles */
.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh; /* Use min-height to avoid issues with mobile keyboard */
    padding: 20px;
    box-sizing: border-box;
}

.login-form {
    background: #ffffff;
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 400px;
    box-sizing: border-box;
}

.login-form h2 {
    margin-top: 0;
    margin-bottom: 20px;
    text-align: center;
    color: #333;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #555;
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="password"] {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 4px;
    box-sizing: border-box; 
    font-size: 16px; /* Prevents auto-zoom on iOS */
}

.form-group .is-invalid {
    border-color: #dc3545;
}

.invalid-feedback {
    color: #dc3545;
    font-size: 0.875em;
    display: block;
    margin-top: 5px;
}

.btn {
    display: inline-block;
    padding: 12px 15px;
    border: none;
    border-radius: 4px;
    color: #fff;
    cursor: pointer;
    text-align: center;
    text-decoration: none;
    font-size: 16px;
    transition: background-color 0.3s ease;
}

.btn-primary {
    background-color: #007bff;
    width: 100%;
}

.btn-primary:hover {
    background-color: #0056b3;
}

.login-form p {
    text-align: center;
    margin-top: 20px;
}

.alert-danger {
    color: #721c24;
    background-color: #f8d7da;
    border-color: #f5c6cb;
    padding: 10px;
    border-radius: 4px;
    margin-bottom: 20px;
    text-align: center;
}


/* Index Page Styles */
.main-header {
    background-color: #ffffff;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    padding: 1rem 0;
}

.main-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.main-header .logo {
    margin: 0;
    font-size: 1.5rem;
    color: #007bff;
}

.main-nav {
    display: flex;
    align-items: center;
}

.main-nav span {
    margin-right: 20px;
    font-weight: 500;
}

.btn-danger {
    background-color: #dc3545;
}

.btn-danger:hover {
    background-color: #c82333;
}


.main-content {
    padding: 40px 0;
}

.main-content h2 {
    border-bottom: 2px solid #eee;
    padding-bottom: 10px;
    margin-bottom: 30px;
    font-weight: 300;
    color: #333;
}

.topic-list ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.topic-list li {
    background: #ffffff;
    margin-bottom: 10px;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
    transition: all 0.3s ease-in-out;
}

.topic-list li:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

.topic-list a {
    display: block;
    padding: 20px;
    text-decoration: none;
    color: #007bff;
    font-size: 1.1rem;
    font-weight: 500;
}

.topic-list a:hover {
    text-decoration: underline;
}


/* =================================== */
/* Responsive Media Queries           */
/* =================================== */

/* For tablets and smaller desktops */
@media (max-width: 768px) {
    .main-header .container {
        flex-direction: column;
        gap: 10px;
    }
    .main-nav {
        margin-top: 10px;
    }
}

/* For mobile phones */
@media (max-width: 480px) {
    .login-form {
        padding: 20px; /* Reduce padding on small screens */
        box-shadow: none; /* Optional: remove shadow on mobile */
        border: 1px solid #ddd;
    }

    .main-header {
        padding: 0.5rem 0;
    }

    .main-header .logo {
        font-size: 1.2rem;
    }
    
    .main-nav span {
        display: block;
        text-align: center;
        margin-right: 0;
        margin-bottom: 10px;
    }
    
    .main-nav {
        flex-direction: column;
        width: 100%;
    }

    .btn {
        width: 100%;
    }
}