.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    align-items: center;
    justify-content: center;
    z-index: 2000;
}

.modal-content {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 10px;
    max-width: 400px;
    width: 90%;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    animation: fadeIn 0.3s ease-out;
}

.close-modal {
    position: absolute;
    top: 15px;
    right: 15px;
    font-size: 1.5em;
    color: var(--text-color);
    cursor: pointer;
    transition: color 0.3s ease;
}

.close-modal:hover {
    color: #ff5555;
}

.modal-content h2 {
    color: var(--accent-color);
    text-align: center;
    margin-bottom: 20px;
}

.modal-content form {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.modal-content label {
    color: var(--text-color);
    font-size: 1.1em;
}

.modal-content input {
    width: 100%;
    padding: 10px;
    background: var(--nav-bg);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    border-radius: 5px;
    font-size: 1em;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.modal-content input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 5px rgba(0, 255, 157, 0.5);
}

.modal-content button {
    background: var(--accent-color);
    color: var(--bg-color);
    padding: 10px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background 0.3s ease;
}

.modal-content button:hover {
    background: #00e68a;
}

.modal-content p {
    text-align: center;
    margin-top: 15px;
    color: var(--text-color);
}

.modal-content a {
    color: var(--accent-color);
    text-decoration: none;
}

.modal-content a:hover {
    text-decoration: underline;
}

.error {
    color: #ff5555;
    font-size: 0.9em;
    margin-top: 5px;
    min-height: 1em;
}

.modal-content input:invalid:focus {
    border-color: #ff5555;
    box-shadow: 0 0 5px rgba(255, 85, 85, 0.5);
}

.modal-content input:valid:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 5px rgba(0, 255, 157, 0.5);
}

/* Media Queries για Κινητά και Tablets */
@media (max-width: 768px) {
    .modal-content {
        width: 90%;
        max-width: none;
    }
}

@media (max-width: 480px) {
    .modal-content {
        width: 100%;
        padding: 20px;
        max-height: 90vh;
        overflow-y: auto;
    }
    .modal-content h2 {
        font-size: 1.5em;
    }
    .modal-content input,
    .modal-content button {
        font-size: 1.4em;
        padding: 15px;
    }
    .close-modal {
        font-size: 2em;
        top: 10px;
        right: 10px;
    }
    .error {
        font-size: 1em;
    }
}