body, html {
    margin: 0;
    padding: 0;
    height: 100%;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.login-container {
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.login-card {
    background: white;
    border-radius: 15px;
    padding: 40px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 400px;
    text-align: center;
}

.login-logo {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    color: white;
    font-size: 2rem;
}

.login-title {
    color: #333;
    font-weight: 700;
    margin-bottom: 10px;
}

.login-subtitle {
    color: #666;
    margin-bottom: 20px;
}

.form-label {
    display: block;
    text-align: left;
    font-weight: 600;
    color: #333;
    margin-bottom: 5px; /* thêm dòng này */
}

.form-control:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.25);
}

.btn-login {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    padding: 12px;
    font-weight: 600;
    border-radius: 30px; /* tăng lên 30px cho tròn mềm mại */
    transition: all 0.3s ease;
    color: white;
}

    .btn-login:hover {
        transform: translateY(-2px);
        box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
    }

.forgot-password-link {
    color: #667eea;
    text-decoration: none;
    font-size: 0.9rem;
}

    .forgot-password-link:hover {
        color: #764ba2;
        text-decoration: underline;
    }

.text-danger {
    font-size: 0.875rem;
    margin-top: 5px;
}

@media (max-width: 768px) {
    .login-card {
        padding: 30px 20px;
    }
}