body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: var(--bg-light);
    margin: 0;
    font-family: sans-serif;
}

.auth-card {
    background: white;
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    width: 100%;
    text-align: center;
    box-sizing: border-box;
}

.auth-card.login-mode    { max-width: 350px; }
.auth-card.register-mode { max-width: 400px; }

.auth-card h2 {
    color: var(--primary-color);
    margin-bottom: 20px;
    margin-top: 0;
}

.auth-card p.subtitle {
    color: var(--color-musgo);
    margin-bottom: 20px;
}

.form-group { margin-bottom: 15px; text-align: left; }

label {
    display: block;
    margin-bottom: 5px;
    color: var(--color-musgo);
    font-weight: bold;
    text-align: left;
}

input {
    width: 100%;
    padding: 10px;
    margin-bottom: 15px;
    border: 1px solid var(--color-terra);
    border-radius: 5px;
    box-sizing: border-box;
}

.btn-primary {
    width: 100%;
    padding: 12px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 5px;
    font-weight: bold;
    cursor: pointer;
    font-size: 16px;
    transition: 0.3s;
    text-decoration: none;
    display: inline-block;
    box-sizing: border-box;
}

.btn-primary:hover { background-color: var(--secondary-color); }

.alert-error {
    background: #FDDCDA;
    color: var(--danger-color);
    padding: 10px;
    border-radius: 5px;
    margin-bottom: 15px;
    font-size: 14px;
    border: 1px solid #F1A9A6;
}

.separador   { margin: 20px 0; border-top: 1px solid var(--color-palha); }

.helper-text {
    color: var(--color-musgo);
    display: block;
    text-align: left;
    margin-top: -10px;
    margin-bottom: 10px;
    font-size: 0.85em;
}

.link-secondary {
    color: var(--color-musgo);
    text-decoration: none;
    display: inline-block;
    margin-top: 10px;
}