.site-header {
    background: #0A0908;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    padding: 1rem 2rem;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
}

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

.nav-brand {
    font-size: 1.5rem;
    font-weight: bold;
    color: #fff;
}

.auth-buttons button {
    padding: 0.5rem 1rem;
    margin-left: 1rem;
    border: none;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: background-color 0.3s;
}

.login-btn {
    background-color: #2980B9;
    color: white;
}

.signup-btn {
    background-color: #2980B9;
    color: white;
}

.logout-btn {
    background-color: #2980B9;
    color: white;
}

/* Popup styles */
.popup-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}

.popup-content {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    position: relative;
    width: 90%;
    max-width: 400px;
}

.close-popup {
    position: absolute;
    right: 1rem;
    top: 0.5rem;
    font-size: 1.5rem;
    cursor: pointer;
    color: #666;
}

.close-popup:hover {
    color: #333;
}

/* Override some existing form styles for the popup */
.popup-content .form-box {
    display: block;
    box-shadow: none;
    padding: 0;
}

.error-message {
    padding: 0.75rem;
    background: #f8d7da;
    border-radius: 4px;
    color: #721c24;
    margin-bottom: 1rem;
    text-align: center;
}

.popup-content form {
    box-sizing: border-box;
    padding: 0 15px;
}

.popup-content form input {
    width: 100%;
    padding: 12px;
    background: #eee;
    border-radius: 6px;
    border: none;
    outline: none;
    font-size: 16px;
    color: #333;
    margin-bottom: 20px;
    box-sizing: border-box;
}

.popup-content form button[type="submit"] {
    width: 100% !important;
    padding: 12px !important;
    background: #2980B9 !important;
    border-radius: 6px !important;
    border: none !important;
    cursor: pointer !important;
    font-size: 16px !important;
    color: #fff !important;
    font-weight: 500 !important;
    margin: 0 0 20px 0 !important;
    transition: 0.5s !important;
    box-sizing: border-box !important;
    min-width: auto !important;
}

.popup-content form button[type="submit"]:hover {
    background: #1A5276;
}

.popup-content form h2 {
    text-align: center;
    margin-bottom: 20px;
    color: #333;
    box-sizing: border-box;
    padding: 0 15px;
}

.popup-content form p {
    font-size: 14px;
    text-align: center;
    margin-bottom: 10px;
    box-sizing: border-box;
    padding: 0 15px;
    color: #666;
}

.popup-content form p a {
    color: #7494ec;
    text-decoration: none;
    font-weight: 500;
}

.popup-content form p a:hover {
    text-decoration: underline;
}