.auth-container {
    max-width: 450px;
    margin: 5% auto;
    padding: 2rem;
    background: #fffefe;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    font-family: 'Inter', sans-serif;
}

header h1 {
    text-align: center;
    color: #0f1633;
    margin-bottom: 2rem;
}

.auth-options {
    display: flex;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid #eee;
}

.auth-options button {
    flex: 1;
    padding: 0.8rem;
    background: none;
    border: none;
    font-size: 1.1rem;
    font-weight: 500;
    cursor: pointer;
    color: #777;
    transition: all 0.3s;
}

.auth-options button.active {
    color: #101733;
    border-bottom: 2px solid #151d3e;
}

.form-container {
    padding: 1rem 0;
}

.input-group {
    margin-bottom: 1.2rem;
}

.input-group input {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 1rem;
    transition: border 0.3s;
}

.input-group input:focus {
    border-color: #151e43;
    outline: none;
}

.btn-primary {
    width: 100%;
    padding: 12px;
    background: #2a3a7c;
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    cursor: pointer;
    transition: background 0.3s;
}

.btn-primary:hover {
    background: #1a2a6c;
}

.hidden {
    display: none;
}